JP6288494B2 - Double-sided adhesive sheet and article - Google Patents

Description

  The present invention relates to a double-sided pressure-sensitive adhesive sheet that can be used for fixing decorative members such as punching sheets and various electronic components.

  In the manufacturing process of an electronic device, an adhesive sheet is used for fixing various components constituting the electronic device. For example, as speaker portions provided in televisions, radios, personal computers, various mobile terminals, and the like, a punching sheet having a through hole is often fixed to the casing with an adhesive sheet. As the pressure-sensitive adhesive sheet used for the above-mentioned application, a light-shielding pressure-sensitive adhesive sheet is often used for the purpose of preventing a deterioration in design properties due to the visual recognition of the pressure-sensitive adhesive sheet.

  As the light-shielding pressure-sensitive adhesive sheet, for example, a double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer having a concavo-convex shape and a nonwoven fabric substrate formed using a black water-dispersed pressure-sensitive adhesive composition is known ( For example, see Patent Document 1.)

  However, the pressure-sensitive adhesive layer may cause a significant decrease in cohesive force due to the influence of a colorant such as a pigment, and as a result, may cause a significant decrease in adhesion to the adherend and holding force in the shear direction. there were. Further, the pressure-sensitive adhesive sheet in which the amount of the colorant contained in the pressure-sensitive adhesive layer is simply adjusted so as to maintain the pressure-sensitive adhesive performance does not have a practically sufficient light-shielding property and easily causes glare due to light reflection. As a result, high designability may not be sufficiently imparted.

  Also, when a decorative member such as a punching sheet is fixed using the double-sided adhesive tape, glare due to light reflection may be suppressed to some extent if it is immediately after fixing, but the glare occurs over time. There was a case of letting. This may occur due to the influence of the heat, particularly when the double-sided pressure-sensitive adhesive tape is used near the heat generating member.

JP 2012-021053 A

  The problem to be solved by the present invention is that even when an aqueous pressure-sensitive adhesive is used, it has excellent adhesion and holding power, excellent light shielding properties, and prevention of glare caused by irregular reflection of light. And it is providing the double-sided adhesive sheet which can prevent generation | occurrence | production of the said glare with time by the influence of heat etc.

  The inventors do not simply use a pressure-sensitive adhesive layer formed using an aqueous pressure-sensitive adhesive containing a black colorant, but set the amount of the colorant used within a specific range, It has been found that the above-mentioned problems can be solved by setting the initial gloss rate and the gel fraction within a specific range.

  That is, this invention is a double-sided adhesive sheet which has an adhesive layer (B1) on the single side | surface or both surfaces of a nonwoven fabric base material (A), Comprising: The said adhesive layer (B1) is an acrylic polymer (b1-1), and It is a layer formed using the aqueous adhesive containing a coloring agent (b1-2), Comprising: The said coloring agent (b1-2) is 1 mass%-10 mass with respect to the said adhesive layer (B1) whole. %, The initial glossiness of the surface of the pressure-sensitive adhesive layer (B1) is 20% or less, and the gel fraction of the pressure-sensitive adhesive layer (B1) is in the range of 35% by mass to 80% by mass. It is related with the double-sided adhesive sheet characterized by this.

  The double-sided pressure-sensitive adhesive sheet of the present invention has an excellent adhesion to the adherend and a holding force in the shear direction, and has an excellent shielding property (light-shielding property) against light and the like. Since glare caused by reflection can be prevented, it can be used especially for applications requiring high design properties. For example, decorative members constituting speakers of televisions, radios, audio products, personal computers, etc., and decorative members constituting exhaust ports. It can be suitably used for fixation. In particular, the double-sided pressure-sensitive adhesive sheet can suppress glare due to light reflection for a long period of time, and thus can be suitably used for fixing a punching sheet constituting a speaker or the like that is required to have a higher design.

  In addition, the double-sided PSA sheet of the present invention has excellent adhesion and holding power and excellent shielding properties against light (light shielding) even when an aqueous adhesive is used in place of the conventional solvent-type acrylic adhesive. ) And high design with both glare-preventing properties due to diffused reflection of light, and it is possible to prevent the occurrence of glare over time due to the influence of heat, etc. Can be reduced.

  The double-sided pressure-sensitive adhesive sheet of the present invention is a double-sided pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer (B1) on one side or both sides of the nonwoven fabric substrate (A), and the pressure-sensitive adhesive layer (B1) is an acrylic polymer (b1-1). ) And an aqueous pressure-sensitive adhesive containing a colorant (b1-2), wherein the colorant (b1-2) is 1% by mass to the entire pressure-sensitive adhesive layer (B1). It is contained in the range of 10% by mass, the initial glossiness of the surface of the pressure-sensitive adhesive layer (B1) is 20% or less, and the gel fraction of the pressure-sensitive adhesive layer (B1) is in the range of 35% by mass to 80% by mass. It is characterized by being.

  As a nonwoven fabric base material (A) which comprises the said double-sided adhesive sheet, the fiber formed using rayon, a pulp, a Manila hemp, nylon, polyester, a polypropylene, polyvinyl alcohol etc. can be used, for example. Especially, as said nonwoven fabric base material (A), it is adhesive to use the nonwoven fabric base material formed using the fiber obtained by using 1 or more types chosen from the group which consists of rayon, a pulp, and a Manila hemp. It is preferable to further improve the adhesiveness with the agent layer (B1), and a non-woven fabric substrate formed using fibers obtained by using one or more selected from the group consisting of rayon and pulp is used. Is more preferable, and it is more preferable to use a nonwoven fabric substrate formed using fibers obtained by using a combination of rayon and pulp.

  As the fiber obtained by using a combination of the rayon and the pulp, it is possible to use the one having a mass ratio of [rayon / pulp] in the range of 2/8 to 8/2, and the pressure-sensitive adhesive layer (B1). It is preferable for further improving the adhesion of the resin.

  As the non-woven fabric substrate (A), it is preferable to use a material having a thickness of 10 μm to 200 μm, and it is preferable to use a material having a thickness of 15 μm to 80 μm. Adhesion between the non-woven fabric substrate (A), the pressure-sensitive adhesive layer (B1) and the pressure-sensitive adhesive layer (B2) is obtained by appropriately impregnating the non-woven fabric substrate (A) with a part of the layer (B2). It is particularly preferable since it can be further improved.

The basis weight of the nonwoven fabric base material (A) is not particularly ^limited, it is preferably in the range of ^{5g / m 2 ~25g / m 2} , in the range of ^{8g / m 2 ~20g / m 2} , The adhesion between the nonwoven fabric substrate (A), the pressure-sensitive adhesive layer (B1), and the pressure-sensitive adhesive layer (B2) can be further improved.

Density of the nonwoven fabric base material (A) is not particularly ^limited, is preferably in the range of ^{0.1g / cm 3 ~0.8g / cm 3} , 0.3g / cm 3 ~0.6g / cm 3 The adhesiveness between the nonwoven fabric substrate (A), the pressure-sensitive adhesive layer (B1) and the pressure-sensitive adhesive layer (B2) can be further improved.

  Examples of the method for producing the nonwoven fabric substrate (A) include known wet methods, and various paper making methods using a circular net paper machine, a short net paper machine, a long net paper machine, an inclined short net paper machine, and the like. Can be mentioned.

  The pressure-sensitive adhesive layer (B1) constituting the double-sided pressure-sensitive adhesive sheet of the present invention contains an acrylic polymer (b1-1), a colorant (b1-2), and a crosslinking agent (b1-3) as necessary. It is a layer formed using an aqueous pressure sensitive adhesive.

  The pressure-sensitive adhesive layer (B1) is a layer containing 1% by mass to 10% by mass of the colorant (b1-2) with respect to the entire pressure-sensitive adhesive layer (B1), preferably 1% by mass to 5% by mass. % Layer. Thereby, it is possible to achieve both excellent adhesive strength and shearing direction holding power and excellent light shielding properties.

  As the pressure-sensitive adhesive layer (B1), a layer having an initial glossiness of 20% or less is used for preventing glare caused by irregular reflection of light and imparting high design properties to the article. . As the pressure-sensitive adhesive layer (B1), it is preferable to use a pressure-sensitive adhesive layer having an initial glossiness in the range of 0.1% to 10%.

  The initial glossiness is determined according to JIS Z 8741. The surface of the pressure-sensitive adhesive layer (B1) immediately after the release liner of the double-sided pressure-sensitive adhesive sheet was peeled off at 23 ° C. and 50% RH was measured with a gloss meter [Konica Minolta This is a value measured at a measurement angle of 60 degrees using a model: GM-268Plus, manufactured by Co., Ltd.

  As the pressure-sensitive adhesive layer (B1), it is preferable to use a layer having a concavo-convex shape on the surface in order to provide the initial range of the initial glossiness. Specifically, as the concavo-convex shape, the maximum height (Ry) of the convex portion is preferably 1 μm to 20 μm, more preferably 3 μm to 20 μm, and further preferably 10 μm to 18 μm. Preferably, the thickness is 14 μm to 18 μm, which has both excellent adhesion and holding power, excellent shielding properties against light and the like (light shielding properties), and high design properties that simultaneously prevent glare caused by irregular reflection of light. This is preferable.

  The maximum height (Ry) of the convex portion is a color 3D laser microscope [manufactured by Keyence Co., Ltd., model: VK-9500], the lens magnification is 50 times, the measurement mode is ultra depth, and the pitch is 0. When measuring the surface of the adhesive (B1) layer having a length of 200 μm and a width of 250 μm at an arbitrary position with an optical zoom of 1.0 × 0.05 μm, the convex portion is the highest from the lowest position of the concave portion. The distance to the position is the maximum height (Ry) value.

  Further, the surface roughness (Ra) of the pressure-sensitive adhesive layer (B1) is preferably 0.1 μm to 5 μm, more preferably 0.3 μm to 4 μm, and preferably 1 μm to 3 μm. It is preferable to achieve both high adhesiveness and holding power, and excellent design properties that achieve both excellent light shielding properties (light shielding properties) against light and the like, and prevention of glare caused by irregular reflection of light.

  The surface roughness of the pressure-sensitive adhesive layer (B1) is a color 3D laser microscope (manufactured by Keyence Corporation, model: VK-9500), lens magnification is 50 times, measurement mode is ultra-deep, and pitch is 0. It is the value of arithmetic average roughness (Ra) obtained by measuring the surface of a release liner measuring 200 μm in length and 250 μm in width at an arbitrary position with an optical zoom of 1.0 times of 0.05 μm.

The number of convex portions on the surface of the pressure-sensitive adhesive layer (B1) is preferably 100 to 1600, and 200 to 900 per 1 mm ^{2 on} the surface of the pressure-sensitive adhesive layer (B1). It is more preferable that the number is 300 to 500, which has both excellent adhesion and holding power, excellent shielding properties against light (light shielding properties), and prevention of glare caused by irregular reflection of light. It is preferable for achieving both design properties.

  In addition, the number of the convex portions is a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500]. It is the number of convex portions where the height (distance from the average line to the convex portion) is 1 μm or more as observed and counted on the surface of the 1 μm square adhesive layer (B1).

  Moreover, it is preferable that the area of the said convex part occupies 10%-50% with respect to the total area of an adhesive layer (B1), and it is excellent adhesion that it occupies 20%-40%. It is preferable in order to achieve both the strength and holding power, and excellent design properties that achieve both excellent shielding properties (light shielding properties) against light and the like, and preventing glare caused by irregular reflection of light.

In addition, the area occupied by the convex portion is a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500], and the lens magnification is 2.5 times. Observe the surface of the 1 μm square adhesive layer, and calculate the ratio of the area of the convex part where the height (distance from the average line to the convex part) is 1 μm or more with respect to the total area (1 μm ² ) observed. It is the value.

  Moreover, as said adhesive layer (B1), what has a crosslinked structure is used. The degree of crosslinking can be expressed as a gel fraction. As said adhesive layer (B1), that whose gel fraction is the range of 35 mass%-80 mass% is used. As a result, it is possible to prevent glare over time due to irregular reflection of light.

  As the pressure-sensitive adhesive layer (B1), the gel fraction is 45% by mass to 78% by mass in order to prevent the occurrence of glare over a longer period of time and to give even better adhesive force. It is preferable to use a pressure-sensitive adhesive layer, more preferably a pressure-sensitive adhesive layer that is 50% by mass to 75% by mass, and still more preferably a pressure-sensitive adhesive layer that is 60% by mass to 70% by mass.

  In addition, the said gel fraction points out the value measured with the following method.

The mass (G ₀ ) of the pressure-sensitive adhesive layer (B1) was measured. Next, the pressure-sensitive adhesive layer (B1) is immersed in toluene in a 23 ° C., 50% RH environment, left for 24 hours, and then filtered through a 300-mesh wire net to separate toluene-insoluble matter. The mass (G ₁ ) of toluene insoluble matter obtained by drying the minute at 105 ° C. for 1 hour was measured.
The gel fraction was measured based on the masses (G ₀ ) and (G ₁ ) and the following formula.

Gel fraction (mass%) = (G ₁ / G ₀ ) × 100

  Moreover, as said adhesive layer (B1), it is preferable to use the adhesive layer from which the total light transmittance measured according to JISK7136 becomes 0%-10%, and the adhesive which becomes 0%-1%. It is more preferable to use a layer, and it is more preferable to use a pressure-sensitive adhesive layer of 0% to 0.1%, and to use a pressure-sensitive adhesive layer of 0% to provide further excellent light-shielding properties. It is particularly preferable for producing a double-sided pressure-sensitive adhesive sheet and imparting high designability to an article obtained by sticking it.

  The pressure-sensitive adhesive layer (B1) preferably has a thickness in the range of 20 μm to 200 μm, more preferably in the range of 30 μm to 100 μm, and a range of 40 μm to 80 μm. It is further preferable that When the double-sided pressure-sensitive adhesive sheet has the pressure-sensitive adhesive layer (B1) on both sides of the nonwoven fabric substrate (A), the total thickness of the double-sided pressure-sensitive adhesive layers (B1) is within the above range. However, it is preferable because the light shielding property and the adhesive performance can be balanced.

  The pressure-sensitive adhesive layer (B1) can be formed using an aqueous pressure-sensitive adhesive containing an acrylic polymer (b1-1) and a colorant (b1-2). As the water-based pressure-sensitive adhesive, those obtained by dispersing or dissolving the acrylic polymer (b1-1) or the colorant (b1-2) in an aqueous medium can be used. Among these, as the aqueous pressure-sensitive adhesive, the acrylic polymer (b1-1) and the colorant (b1-2) are dispersed in an aqueous medium in order to prevent a decrease in adhesive force due to the influence of moisture or the like. It is preferable to use a water-dispersed acrylic pressure-sensitive adhesive.

  Examples of the acrylic polymer (b1-1) include vinyl monomers having a (meth) acrylate carboxyl group having an alkyl group having 4 to 8 carbon atoms, and other vinyl monomers as necessary. A polymer component obtained by polymerizing a polymer component containing can be used. By using the (meth) acrylate having a C 4-8 alkyl group and a vinyl monomer having a carboxyl group, an even better adhesive force to the adherend and an excellent shear direction A pressure-sensitive adhesive layer having a holding force can be formed.

  Examples of the (meth) acrylate having an alkyl group having 4 to 8 carbon atoms include 2-ethylhexyl acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, isooctyl (meta ) Acrylates and (meth) acrylates such as n-octyl (meth) acrylate can be used. Among them, as the (meth) acrylate having an alkyl group having 4 to 8 carbon atoms, it is preferable to use 2-ethylhexyl acrylate or n-butyl acrylate. Particularly, n-butyl acrylate and 2-ethylhexyl acrylate are used in combination. It is preferable to do. The mass ratio [BA / 2EHA] of n-butyl acrylate [BA] and 2-ethylhexyl acrylate [2EHA] is preferably in the range of 0.1 to 9, and in the range of 0.4 to 2.5. More preferably, it is more preferably in the range of 0.6 to 1.5, and use in the range of 0.8 to 1.2 is to maintain the adhesion force to the adherend and the shear direction. It is particularly preferable when forming a pressure-sensitive adhesive layer with even more excellent strength.

  The (meth) acrylate having an alkyl group having 4 to 8 carbon atoms is 50% by mass to 99% by mass with respect to the total amount of monomer components used for the production of the acrylic polymer (b1-1). Is preferably used in the range of 70% by mass to 98% by mass, and more preferably in the range of 90% by mass to 98% by mass.

  As the vinyl monomer having a carboxyl group, for example, acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, phthalic acid, phthalic anhydride, crotonic acid or the like may be used alone or in combination. Can do.

  As the vinyl monomer having a carboxyl group, it is preferable to use acrylic acid or methacrylic acid. In particular, it is preferable to use a combination of acrylic acid and methacrylic acid so as to have excellent adhesion to the adherend and shearing. A pressure-sensitive adhesive layer having a direction holding force can be formed, which is more preferable.

  The vinyl monomer having a carboxyl group is used in the range of 0.1% by mass to 10% by mass with respect to the total amount of monomer components used for the production of the acrylic polymer (b1-1). It is preferable to use in the range of 0.5% by mass to 5% by mass, and it is preferable to use in the range of 1.5% by mass to 4% by mass because the crosslinking reaction with the crosslinking agent described later is good. It is further preferable to form a pressure-sensitive adhesive layer having an excellent adhesion to the adherend and a holding force in the shear direction.

  When acrylic acid and methacrylic acid are used in combination as the vinyl monomer having a carboxyl group, the molar ratio [MAA / AA] of methacrylic acid [MAA] and acrylic acid [AA] is 0.2 to 33. It is preferably used in a range, more preferably used in a range of 0.5 to 11, and use in a range of 0.8 to 3 with excellent adhesion to the adherend, In forming an adhesive layer having a holding force in the shear direction, it is particularly preferable.

  The acrylic polymer (b1-1) includes an alkyl group having 1 to 3 carbon atoms together with the (meth) acrylate having an alkyl group having 4 to 8 carbon atoms and a vinyl monomer having a carboxyl group. The double-sided pressure-sensitive adhesive sheet provided with a pressure-sensitive adhesive layer having an even better adhesion to the adherend is obtained by polymerizing monomer components containing a combination of (meth) acrylates. Is preferable in manufacturing.

  Examples of the (meth) acrylate having an alkyl group having 1 to 3 carbon atoms include (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, and isopropyl (meth) acrylate. ) Acrylate can be used. Especially, as said (meth) acrylate which has a C1-C3 alkyl group, it is preferable to use methyl methacrylate and ethyl methacrylate, and it is especially preferable to use methyl methacrylate with respect to a to-be-adhered body. It is preferable when forming a pressure-sensitive adhesive layer with even better adhesive strength.

  The (meth) acrylate having an alkyl group having 1 to 3 carbon atoms is 0.1% by mass to 20% with respect to the total amount of monomer components used in the production of the acrylic polymer (b1-1). It is preferably used in the range of 1% by mass, more preferably in the range of 1% by mass to 15% by mass, still more preferably in the range of 2% by mass to 10% by mass, and 3% by mass to 5% by mass. It is particularly preferred to use in By using the (meth) acrylate having an alkyl group having 1 to 3 carbon atoms within the above range, even if the gel fraction of the pressure-sensitive adhesive layer is high, it is difficult to adhere such as polystyrene or polycarbonate. Thus, it is possible to form a pressure-sensitive adhesive layer that provides good adhesion to the adherend and a constant load holding force in the 90-degree direction.

  As the acrylic polymer (b1-1), the (meth) acrylate having an alkyl group having 4 to 8 carbon atoms, a vinyl monomer having a carboxyl group, and optionally having 1 to 3 carbon atoms. Use of a polymer obtained by polymerizing a monomer component containing a vinyl monomer having a nitrogen atom together with a (meth) acrylate having an alkyl group is a case where the gel fraction of the pressure-sensitive adhesive layer is high. However, it is preferable for producing a double-sided pressure-sensitive adhesive sheet provided with a pressure-sensitive adhesive layer having an even better adhesive force to the adherend and a good constant load holding force in the 90-degree direction.

  Examples of the vinyl monomer having a nitrogen atom include N-vinylpyrrolidone, N-vinylpiperidone, N-vinylmorpholinone, N-vinylcaprolactam, N-cyclohexylmaleimide, N-butylmaleimide, N-phenylmaleimide, N -(Meth) acryloylmorpholine, N- (meth) acryloylpyrrolidone, N- (meth) acryloylpiperidine, N- (meth) acryloylpyrrolidine, N- (meth) acryloyl-4-piperidone, acrylonitrile, (meth) acrylamide, N , N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N, N-methylene (Meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, t-butylaminoethyl (meth) acrylate 1 or more can be used, and it is preferable to use N-vinylpyrrolidone.

  The vinyl monomer having a nitrogen atom is preferably used in the range of 0.1% by mass to 5% by mass with respect to the total amount of monomer components used in the production of the acrylic polymer. It is more preferable to use in the range of 5% by mass to 3% by mass, and even in the case where the gel fraction of the pressure-sensitive adhesive layer is high, it is preferable to use in the range of 1% by mass to 1.5% by mass. In particular, a pressure-sensitive adhesive layer having good adhesion to an adherend that is difficult to adhere to such as polystyrene and polycarbonate and a constant load holding force in the 90-degree direction is particularly preferable.

  When the vinyl monomer having a nitrogen atom and the vinyl monomer having a carboxyl group are used in combination, the nitrogen atom of the vinyl monomer having a nitrogen atom and the carboxyl of the vinyl monomer having a carboxyl group The molar ratio [nitrogen atom / carboxyl group] with the group is preferably 0.05 to 1, more preferably 0.1 to 0.5, and more preferably 0.2 to 0.2. It is particularly preferable to use it in a range of ~ 0.3, particularly when forming a pressure-sensitive adhesive layer having an excellent adhesion to an adherend.

  As said acrylic polymer (b1-1), what is obtained by superposing | polymerizing the monomer component containing another vinyl monomer as needed other than the above-mentioned monomer component is used. be able to.

  Examples of the other vinyl monomers include hydroxyl groups such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. Vinyl monomer having; diacetone acrylamide, diacetone methacrylamide, acrolein, formyl styrene, vinyl methyl ketone, vinyl ethyl ketone, vinyl isobutyl ketone, diacetone acrylate, diacetone methacrylate, acetonitrile acrylate, 2-hydroxypropyl acrylate acetoacetate A monomer having a keto group or an aldehyde group such as butanediol acrylate acetate; a monomer having a methylol group such as N-methylolacrylamide; Monomers having a phosphoric acid group such as propylene glycol monomethacrylate monophosphate and bis (ω-methacryloyloxypolyoxypropylene) phosphate, SIPOMER PAM-100, PAM-200 and PAM-300 containing them (Rhodia Nikka Co., Ltd.) etc. can be used.

  As a method for producing the acrylic polymer (b1-1), for example, a method in which the monomer component is radically polymerized in an organic solvent and then converted into an aqueous phase, and the monomer component is emulsified in an aqueous medium. The method of superposing | polymerizing is mentioned, It is preferable when aiming at environmental impact reduction to employ | adopt an emulsion polymerization method.

  The monomer component may be supplied all at once in the solvent such as the organic solvent or the aqueous medium, or may be sequentially supplied by a method such as dropping.

  In the emulsion polymerization method, it is preferable that the monomer component and the polymerization initiator are separately dropped into an aqueous medium.

  In the emulsion polymerization method, an anionic emulsifier, a nonionic emulsifier, other dispersion stabilizers and the like can be used for the purpose of ensuring polymerization stability.

  Examples of the anionic emulsifier include sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, and the like. As the nonionic emulsifier, for example, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether and the like can be used.

  As the emulsifier, it is preferable to use an emulsifier having a polymerizable unsaturated group in the molecule, generally called “reactive emulsifier”. Examples of the reactive emulsifier include Latemul PD-104 [manufactured by Kao Corporation], Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd.], Adekaria Soap SE-10 [manufactured by ADEKA Corporation], Eleminol. And JS-20 [manufactured by Sanyo Chemical Industries, Ltd.]. Use of a reactive emulsifier is preferable because moisture resistance is improved in addition to polymerization stability.

  Examples of the polymerization initiator that can be used for producing the acrylic polymer (b1-1) include 4,4-azobis (4-cyanopentanoic acid), 2,2 ′,-azobis (2-methylpropion). Amidine) dihydrochloride, 2,2′-azobis (2-methylpropionamidine) sulfate, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis [N- (2- Alboxyethyl) -2-methylpropionamidine] hydrate, 2,2′-azobis (N, N′-dimethylisobutylamidine) dihydrochloride, 2,2′-azobis [2- (2-imidazoline- 2-yl) propane] dihydrochloride, 2,2′-azobis [2- (2-imidazolin-2-yl) propane] sulfate, 2,2′-azobis [2- (5-methyl-2-imidazoline) -2-yl) Lopan] dihydrochloride, 2,2′-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] sulfate, 2-2′-azobis [2- (3,4,5,6) -Tetrahydropyrimidin-2-yl) propane] dihydrochloride, 2,2'-azobis [2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl] propane] dihydrochloride, 2,2 Azo initiators such as' -azobis (2-methylpropanamide oxime), persulfate initiators such as potassium persulfate, ammonium persulfate, sodium persulfate, benzoyl peroxide, t-butyl hydroperoxide, peroxide Peroxide initiators such as hydrogen, carbonyl initiators such as aromatic carbonyl compounds, combinations of persulfate and sodium bisulfite, peroxide and sodium ascorbate It can be used a redox-based initiators such as a combination. Among these, as the polymerization initiator, it is preferable to use an azo initiator or a persulfate initiator because the polymerization stability is excellent and desired adhesive performance is easily obtained.

  Moreover, when manufacturing the said acrylic polymer (b1-1), a chain transfer agent is added as needed for the purpose of adjusting the molecular weight of an acrylic polymer (b1-1) to arbitrary ranges. Can be used.

  As the chain transfer agent, for example, lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, 2,3-dimethylcapto-1-propanol and the like can be used. .

  As the acrylic polymer (b1-1) obtained by the above method, it is preferable to use one having a weight average molecular weight of 500,000 to 1,200,000, and one having a weight average molecular weight of 600,000 to 1,000,000. It is preferable to use it in order to obtain a double-sided pressure-sensitive adhesive sheet having an excellent adhesion to the adherend and a holding force in the shear direction.

  The weight average molecular weight is a value obtained by standard gel conversion using gel permeation chromatography (GPC). As measurement conditions, the column is TSKgel.

  GMHXL [manufactured by Tosoh] was used, the column temperature was 40 ° C., the eluent was tetrahydrofuran, the flow rate was 1.0 mL / min, and the standard polystyrene was TSK standard polystyrene.

  The acrylic polymer (b1-1) is preferably formed by dispersing particles in an aqueous medium. The average particle diameter of the acrylic polymer (b1-1) particles is not particularly limited, but is preferably 100 nm to 1000 nm, and 150 nm to 500 nm when stored for a long time. However, it is preferable because aggregation and sedimentation hardly occur and the dispersion stability is excellent. The average particle diameter refers to a 50% median diameter based on the volume of the emulsion particles, and the numerical values are based on values obtained by measurement by a dynamic light scattering method.

  Examples of the aqueous medium in which the acrylic polymer (b1-1) can be dispersed include water, organic solvents miscible with water, and mixtures thereof. Examples of the organic solvent miscible with water include alcohols such as methanol, ethanol, n-propanol and isopropanol; ketones such as acetone and methyl ethyl ketone; polyalkylene glycols such as ethylene glycol, diethylene glycol and propylene glycol; Alkyl ethers; lactams such as N-methyl-2-pyrrolidone, ethyl carbitol, ethyl cellosolve, butyl cellosolve, and the like. In the present invention, only water may be used, a mixture of water and an organic solvent miscible with water may be used, or only an organic solvent miscible with water may be used. From the viewpoint of safety and load on the environment, water alone or a mixture of water and an organic solvent miscible with water is preferable, and only water is particularly preferable.

  Examples of the colorant (b1-2) contained in the pressure-sensitive adhesive layer (B1) and the water-based pressure-sensitive adhesive forming the layer include direct dyes, reactive dyes, sulfur dyes, basic dyes, acid dyes, and metal-containing acids. Dyes such as dyes, indigo dyes, selenium dyes, disperse dyes, and cationic dyes; pigments such as organic pigments and inorganic pigments may be used alone or in combination of two or more.

  As the colorant (b1-2), in forming a pressure-sensitive adhesive layer having a total light transmittance of 0% to 10% as the pressure-sensitive adhesive layer (B1), a black-based material containing carbon black or the like is used. It is preferred to use a colorant.

  As the water-based adhesive, when forming a pressure-sensitive adhesive layer having a total light transmittance of 0% to 10% as the pressure-sensitive adhesive layer (B1), 100 parts by mass of the acrylic polymer (b1-1) In contrast, it is preferable to use the colorant (b1-2) in a range of 1 part by mass to 10 parts by mass, and use in a range of 1 part by mass to 5 parts by mass. Is more preferable.

  As an aqueous pressure-sensitive adhesive that can be used for forming the pressure-sensitive adhesive layer (B1), in addition to those described above, those containing a tackifying resin can be used as necessary.

  As the tackifying resin, an emulsion type tackifying resin is preferably used.

  Examples of the emulsion-type tackifying resin include rosin-based tackifying resin, polymerized rosin-based tackifying resin, rosin ester-based tackifying resin, polymerized rosin ester-based tackifying resin, rosin phenol-based tackifying resin, and disproportionated rosin. An ester tackifier resin, a hydrogenated rosin ester tackifier resin, an acid-modified rosin tackifier resin, a terpene tackifier resin, a terpene phenol tackifier resin, a petroleum resin tackifier resin, or the like can be used. As the emulsion-type tackifying resin, a polymerized rosin ester-based tackifying resin or rosin phenol-based tackifying resin is used for forming a pressure-sensitive adhesive layer having excellent adhesion to an adherend made of plastic or the like. Is preferably used.

  The tackifying resin is preferably used in a range of 5 to 50 parts by mass with respect to 100 parts by mass of the resin (solid content) containing the acrylic polymer (b1-1). It is more preferable to use in the range of ˜40 parts by mass, and to use in the range of 20 parts by mass to 30 parts by mass in forming a pressure-sensitive adhesive layer having excellent adhesion to the adherend. Is particularly preferred.

  As the tackifying resin, those having a softening point of 100 ° C to 180 ° C are preferably used, more preferably those having a softening point of 120 ° C to 180 ° C, and those having a softening point of 130 ° C to 180 ° C. It is more preferable to use, and it is particularly preferable to use a material having a temperature of 140 ° C. to 170 ° C., particularly for forming a pressure-sensitive adhesive layer having an excellent adhesion to an adherend.

  Moreover, as an aqueous pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer (B1), in forming the pressure-sensitive adhesive layer (B1) having a gel fraction in the predetermined range, a crosslinking agent (b1-3) is used. It is preferable to use what is contained.

  Examples of the crosslinking agent (b1-3) include an epoxy crosslinking agent, an oxazoline crosslinking agent, a carbodiimide crosslinking agent, a silane crosslinking agent, an isocyanate crosslinking agent, an aziridine crosslinking agent, a polyvalent metal salt crosslinking agent, One or more selected from the group consisting of metal chelate crosslinking agents and keto-hydrazide crosslinking agents can be used.

  Among these, as the cross-linking agent (b1-3), it is more preferable to use an epoxy-based cross-linking agent or an oxazoline-based cross-linking agent. In particular, the use of an epoxy-based cross-linking agent increases the glare caused by light reflection. It is further preferable for forming a pressure-sensitive adhesive layer that can suppress the period and has excellent adhesion to an adherend.

  Examples of the epoxy-based crosslinking agent include Denacol EX-832 [manufactured by Nagase Kasei Kogyo Co., Ltd.], Denacol EX-841 [manufactured by Nagase Kasei Kogyo Co., Ltd.], Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd.], Tetrad X [Mitsubishi Gas Chemical Co., Ltd.] and the like can be used.

  Examples of the oxazoline-based crosslinking agent include Epocross K-2010E [manufactured by Nippon Shokubai Co., Ltd.], Epocross K-2020E [manufactured by Nippon Shokubai Co., Ltd.], Epocross K-2030E [manufactured by Nippon Shokubai Co., Ltd.], Epocross WS- 300 [made by Nippon Shokubai Co., Ltd.], Epocross WS-500 [made by Nippon Shokubai Co., Ltd.], Epocross WS-700 [made by Nippon Shokubai Co., Ltd.] and the like can be used.

  The usage-amount of the said crosslinking agent (b1-3) can be suitably adjusted, when forming the adhesive layer (B1) provided with the gel fraction of the said predetermined range. For example, when using Tetrad C [Mitsubishi Gas Chemical Co., Ltd.] which is an epoxy-based crosslinking agent, Tetrad C [Mitsubishi Gas Chemical Co., Ltd.] is the acrylic polymer (b1-1) 100. It is preferably used in the range of 0.03 parts by mass to 0.2 parts by mass with respect to parts by mass, more preferably in the range of 0.05 parts by mass to 0.18 parts by mass, and 0.07 parts by mass. More preferably, it is used in the range of 0.1 to 0.15 parts by mass, and in the range of 0.11 to 0.13 parts by mass, glare due to light reflection can be suppressed for a long period of time. It is particularly preferable when forming a pressure-sensitive adhesive layer having an excellent adhesive force.

  In addition, when using Epocross WS-700 [manufactured by Nippon Shokubai Co., Ltd.] which is an oxazoline-based cross-linking agent as the cross-linking agent (b1-3), Epocross WS-700 [manufactured by Nippon Shokubai Co., Ltd.] It is preferably used in the range of 1 to 8 parts by mass, more preferably in the range of 2 to 7 parts by mass, with respect to 100 parts by mass of the acrylic polymer (b1-1). More preferably, it is used in the range of 6 parts by mass to 4 parts by mass, and the range of 4-5 parts by mass can suppress glare due to light reflection for a long period of time, and is excellent for adherends. It is particularly preferable when forming a pressure-sensitive adhesive layer having a high adhesive strength.

  The aqueous pressure-sensitive adhesive is produced by mixing a previously produced acrylic polymer (b1-1) or emulsion thereof, the colorant (b1-2), and the crosslinking agent (b1-3). Alternatively, it may be produced by mixing with the colorant (b1-2) or the crosslinking agent (b1-3) during the production process of the acrylic polymer (b1-1) or its emulsion. . In that case, it is preferable to use what was previously melt | dissolved in aqueous media, such as water and ethanol, as said crosslinking agent (b1-3).

  As the aqueous pressure-sensitive adhesive, one having a solid content in the range of 40% by mass to 70% by mass is preferably used for the purpose of further improving the dispersion stability.

  Examples of the water-based pressure-sensitive adhesive include bases (ammonia water and amines) for adjusting pH as required, acids, plasticizers, softeners, antioxidants, glass and plastic fibers, balloons, beads, Fillers such as metal powders, film forming aids, leveling agents, wetting agents, thickeners (viscosity modifiers), water repellents, antifoaming agents, and the like may be used. Their usage is preferably in the range of 0% by mass to 1% by mass.

  The double-sided pressure-sensitive adhesive sheet of the present invention is, for example, a pressure-sensitive adhesive layer (B1 ′) by applying and drying the aqueous pressure-sensitive adhesive using a roll coater, a die coater, or the like on one side or both sides of the predetermined nonwoven fabric substrate (A). And a predetermined release liner is laminated on the surface of the pressure-sensitive adhesive layer (B1 ′) to form the pressure-sensitive adhesive layer (B1).

  Moreover, the double-sided pressure-sensitive adhesive sheet of the present invention forms a pressure-sensitive adhesive layer (B1) by applying and drying the aqueous pressure-sensitive adhesive in advance on the surface of the predetermined release liner using a roll coater or a die coater. Then, the pressure-sensitive adhesive layer (B1) can also be produced by a method of transferring to the nonwoven fabric substrate (A).

As the release liner, an embossed release liner having a concavo-convex shape is preferably used for the purpose of providing a predetermined initial glossiness in the above-described range, and a convex having a height of 1 μm or more is used. It is more preferable to use a release liner having a concavo-convex shape that can give 100 to 1600 parts per 1 mm ² of the surface area of the pressure-sensitive adhesive layer (B1).

  Specifically, as the release liner, it is preferable to use one having a maximum depth (Ry) of the recess of 1 μm to 20 μm, more preferably 3 μm to 20 μm, and more preferably 10 μm. It is more preferable to use a material having a thickness of ˜18 μm, and a material having a thickness of 14 μm to 18 μm is excellent in adhesion and holding power, excellent shielding properties (light shielding properties) against light, etc., and irregular reflection of light. It is preferable because it is possible to achieve both the prevention of glare caused by.

  In addition, the maximum depth (Ry) of the concave portion is a color 3D laser microscope [manufactured by Keyence Co., Ltd., model: VK-9500], the lens magnification is 50 times, the measurement mode is ultra-deep, and the pitch is 0.00. This is the distance from the lowest position of the concave portion to the highest position of the convex portion on the surface of the release liner having a length of 200 μm and a horizontal size of 250 μm at an arbitrary position where the optical zoom is 1.0 times.

  The release liner preferably has a surface roughness (Ra) of 0.1 μm to 5 μm, more preferably 0.3 μm to 4 μm, and more preferably 1 μm to 3 μm. The use of a material having both excellent adhesive strength and holding power, and excellent design properties that achieve both excellent shielding properties against light (light shielding properties) and prevention of glare caused by irregular reflection of light. In addition, it is preferable.

  The surface roughness (Ra) is a color 3D laser microscope [manufactured by Keyence Corporation, model: VK-9500], the lens magnification is 50 times, the measurement mode is ultra-deep, the pitch is 0.05 μm, This is an arithmetic average roughness value obtained by measuring the surface of a release liner measuring 200 μm in length and 250 μm in width at an arbitrary position with an optical zoom of 1.0.

Moreover, as said release liner, it is preferable to use what the number of the recessed parts with which the surface was equipped is 100-1600 per 1 mm < ² >, and use what is 200-900. It is more preferable that using 300 to 500 has excellent adhesive strength and holding power, excellent shielding properties against light (light shielding properties), and prevention of glare due to irregular reflection of light. It is preferable in order to achieve both high design properties that are compatible.

  In addition, the number of the concave portions is 1 μm in length and 1 μm in width at an arbitrary position using a surface shape measuring device [Toray Engineering Co., Ltd., model: SP-500], with a lens magnification of 2.5 times. This is the number of recesses having a depth of 1 μm or more observed and counted on the surfaces of the release liners on all sides.

  Moreover, as said mold release liner, it is preferable that the area of the recessed part with which the surface was equipped occupies 10%-50% with respect to the total area of a mold release liner, and occupies 20%-40%. It is preferable to achieve both excellent adhesive strength and holding power, and excellent design properties that achieve both excellent shielding properties (light shielding properties) against light and the like and prevention of glare caused by irregular reflection of light.

The area occupied by the concave portion is a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500]. This is a value obtained by observing the surface of the release liner of 1 μm square and calculating the ratio of the area of the recess having a height of 1 μm or more with respect to the total area (1 μm ² ) observed.

  After the double-sided pressure-sensitive adhesive sheet of the present invention is produced by the above-described method, the gel fraction of the pressure-sensitive adhesive layer (B1) is adjusted to the predetermined range by curing at 20 ° C. to 50 ° C. for 48 hours or more. In addition, it is preferable.

  The double-sided pressure-sensitive adhesive sheet of the present invention may have the pressure-sensitive adhesive layer (B1) on both surfaces of the nonwoven fabric substrate (A), but can impart excellent design properties to the article, and polystyrene or polycarbonate. When giving the outstanding adhesive force with respect to hard-to-adhere base materials, such as the said non-woven fabric base material (A), it has the said adhesive layer (B1) on one side, and an adhesive layer (B2) on the other side ) Is preferable.

  As the pressure-sensitive adhesive layer (B2), it is preferable to use a layer having a relatively smooth surface in order to prevent peeling and the like by increasing the contact area with the adherend.

  As said adhesive layer (B2), the gel fraction becomes like this. Preferably it is the range of 20 mass%-90 mass%, More preferably, it is the range of 25 mass%-50 mass%, More preferably, it is 30 mass%. It is particularly preferable to use a material in the range of ˜45% by mass in order to develop an excellent adhesive force to the adherend.

  The pressure-sensitive adhesive layer (B2) is one or more kinds selected from the group consisting of an acrylic polymer (b2-1), a crosslinking agent (b2-2) as necessary, and a pigment and a dye as necessary. It can be formed by drying using an aqueous pressure-sensitive adhesive containing an agent (b2-3) and, if necessary, a tackifying resin.

  As the pressure-sensitive adhesive layer (B2), it is preferable to use a pressure-sensitive adhesive layer having a total light transmittance of 0% to 80% measured according to JIS K7136. More preferably, the pressure-sensitive adhesive layer is 0% to 60%, more preferably the pressure-sensitive adhesive layer is 0% to 50%, and the pressure-sensitive adhesive layer is 0% to 1%. Is particularly preferred. In addition, when the excellent light-shielding property of the double-sided pressure-sensitive adhesive sheet of the present invention can be sufficiently ensured by the pressure-sensitive adhesive layer (B1), and when the pressure-sensitive adhesive layer (B2) has a very excellent adhesive force. It is preferable to use an adhesive layer that does not contain the colorant (b2-3) as the adhesive layer (B2).

  As the aqueous pressure-sensitive adhesive capable of forming the pressure-sensitive adhesive layer (B2), those in which the acrylic polymer (b2-1) or the like is dispersed or dissolved in an aqueous medium can be used. Especially, as the water-based pressure-sensitive adhesive, a water-dispersed acrylic pressure-sensitive adhesive in which the acrylic polymer (b2-1) or the like is dispersed in an aqueous medium is used in order to prevent a decrease in adhesive force due to the influence of moisture or the like. It is preferable to use it.

  As said acrylic polymer (b2-1), the thing similar to the said acrylic polymer (b1-1) illustrated as what can be used for formation of the said adhesive layer (B1) can be used. .

  Moreover, as said coloring agent (b2-2), the thing similar to the said coloring agent (b1-2) illustrated as what can be used for formation of the said adhesive layer (B1) can be used.

  Moreover, as said crosslinking agent (b2-3), the thing similar to the said crosslinking agent (b1-3) illustrated as what can be used for formation of the said adhesive layer (B1) can be used.

  Moreover, as the tackifying resin, the same tackifying resin as exemplified for use in forming the pressure-sensitive adhesive layer (B1) can be used.

  As the pressure-sensitive adhesive layer (B2), it is preferable to use one having a crosslinked structure. The degree of crosslinking can be expressed as a gel fraction. As said adhesive layer (B2), when adherends, such as a punching tape, and various cases are joined using the double-sided adhesive sheet of this invention, and articles, such as a television, a radio, and a personal computer, are manufactured. In order to prevent detachment over time, it is preferable to use one having a gel fraction in the range of 20% by mass to 90% by mass, and a gel fraction in the range of 25% by mass to 50% by mass. It is more preferable to use a thing, and it is still more preferable to use what has a gel fraction of the range of 30 mass%-45 mass%.

  The usage-amount of the said crosslinking agent (b2-3) can be suitably adjusted, when forming the adhesive layer (B2) provided with the gel fraction of the said predetermined range. For example, when using Tetrad C [Mitsubishi Gas Chemical Co., Ltd.] which is an epoxy-based crosslinking agent, Tetrad C [Mitsubishi Gas Chemical Co., Ltd.] is the acrylic polymer (b2-1) 100. It is preferably used in the range of 0.01 parts by mass to 0.3 parts by mass, more preferably in the range of 0.01 parts by mass to 0.15 parts by mass with respect to parts by mass. It is more preferable to use in the range of parts by mass to 0.1 parts by mass, and to use in the range of 0.01 to 0.04 parts by mass provides excellent adhesion to difficult-to-adhere substrates such as polystyrene and polycarbonate. When forming the adhesive layer (B2) provided with property, it is particularly preferable.

  In addition, when using Epocross WS-700 [manufactured by Nippon Shokubai Co., Ltd.] which is an oxazoline-based cross-linking agent as the cross-linking agent (b2-3), Epocross WS-700 [manufactured by Nippon Shokubai Co., Ltd.] It is preferably used in the range of 1 to 8 parts by mass, more preferably in the range of 1 to 4 parts by mass, relative to 100 parts by mass of the acrylic polymer (b2-1). More preferably, it is used in the range of 3 parts by mass to 3 parts by mass, and the range of 1.5 parts by mass to 2.5 parts by mass is excellent in adhesion to difficult-to-adhere substrates such as polystyrene and polycarbonate. When forming the adhesive layer (B2) provided with property, it is particularly preferable.

  The aqueous pressure-sensitive adhesive that can be used for forming the pressure-sensitive adhesive layer (B2) has a solid content in the range of 40% by mass to 70% by mass for the purpose of further improving the dispersion stability. It is preferable to use it.

  The pressure-sensitive adhesive layer (B2) preferably has a thickness in the range of 20 μm to 200 μm, more preferably in the range of 30 μm to 100 μm, and in the range of 40 μm to 80 μm. It is more preferable when forming the pressure-sensitive adhesive layer (B2) having excellent adhesion to difficult-to-adhere base materials such as polystyrene and polycarbonate.

  The double-sided PSA sheet of the present invention forms, for example, a PSA layer (B2) by applying and drying the aqueous PSA on one side of the predetermined nonwoven fabric substrate (A) using a roll coater or a die coater. Can be manufactured.

  Moreover, the double-sided pressure-sensitive adhesive sheet of the present invention previously forms a pressure-sensitive adhesive layer (B2) by applying and drying the water-based pressure-sensitive adhesive on the surface of the release liner using a roll coater or a die coater. The pressure-sensitive adhesive layer (B2) can also be produced by a method of transferring it to one side of the nonwoven fabric substrate (A).

  The double-sided pressure-sensitive adhesive sheet produced by any of the above methods is then cured for 48 hours or more in the range of 20 ° C. to 50 ° C. to adjust the gel fraction of the pressure-sensitive adhesive layer (B2) to the predetermined range. Is preferable.

  As the double-sided pressure-sensitive adhesive sheet of the present invention obtained by the above method, it is preferable to use a sheet having a total thickness of 200 μm or less, and it is particularly preferable to use a sheet having a thickness of 100 μm to 200 μm. It is preferable because an excellent adhesion can be exhibited with respect to an adherend having an adhesive strength.

  As the double-sided pressure-sensitive adhesive sheet, when used for fixing a decorative member constituting a speaker or the like, JIS K7136 provides a light-shielding property superior to the speaker or the like and a higher level of design. It is preferable to use one having a total light transmittance of 40% or less measured according to the above, more preferably from 0% to 10%, and more preferably from 0% to 1%. It is particularly preferable to use a material for maintaining good light shielding properties.

  The double-sided pressure-sensitive adhesive sheet of the present invention obtained by the above method can be used exclusively for applications requiring good light-shielding properties, high design properties, and matte properties.

  Therefore, since the double-sided pressure-sensitive adhesive sheet of the present invention has excellent constant load holding power in addition to good light shielding properties, punching is performed in speakers provided in household appliances and electronic devices such as televisions, radios, audio products, and personal computers. It can be suitably used for the purpose of fixing a decorative member such as a sheet.

  Next, the present invention will be described in detail with reference to examples and comparative examples. The evaluation method of each characteristic of the double-sided PSA sheet obtained in Examples and Comparative Examples is as follows.

[Measurement method of total light transmittance of nonwoven fabric substrate]
A test piece was prepared by cutting a nonwoven fabric substrate into a square having a length of 50 mm and a width of 50 mm (area 2500 mm ² ). The total light transmittance of the test piece was measured according to JIS K 7136 using a reflection / transmittance meter HR-100 [manufactured by Murakami Color Research Laboratory Co., Ltd.].

[Measurement method of basis weight of nonwoven fabric substrate]
A test piece was prepared by cutting a nonwoven fabric substrate into a square having a length of 1000 mm and a width of 1000 mm (area 1 m ² ). The mass of the test piece was measured using an electronic balance [manufactured by Shimadzu Corporation, model number: AEL-40SM]. Based on the area and mass of the test piece and the following formula, the basis weight of the test piece was calculated.

Basis weight (g / m ² ) = mass (g) / area (m ² )

[Measurement method of total light transmittance of pressure-sensitive adhesive layer]
The water-dispersed acrylic pressure-sensitive adhesive obtained in Preparation Example was applied to a release liner having a smooth surface and dried in an environment of 100 ° C., thereby preparing a smooth pressure-sensitive adhesive layer having a thickness of 65 μm.

  The total light transmittance of the pressure-sensitive adhesive layer obtained by peeling off the release liner was measured according to JIS K 7136 using a reflection / transmittance meter HR-100 type [manufactured by Murakami Color Research Laboratory Co., Ltd.].

[Measurement method of total light transmittance of double-sided PSA sheet]
The double-sided PSA sheets obtained in Examples and Comparative Examples were cut into squares with an area of 25 cm ² and the release liners laminated on both sides were peeled off to make test pieces. The total light transmittance of the test piece was measured according to JIS K 7136 using a reflection / transmittance meter HR-100 type [manufactured by Murakami Color Research Laboratory Co., Ltd.].

[Measurement method of maximum height of convex part of adhesive layer]
The surface of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples was used with a color 3D laser microscope [manufactured by Keyence Corporation, model: VK-9500], the lens magnification was 50 times, and the measurement mode was ultra-deep. The maximum height (Ry) was measured at an arbitrary location (vertical 200 μm, horizontal 250 μm) with a pitch of 0.05 μm and an optical zoom of 1.0.

[Method for measuring surface roughness (arithmetic mean roughness) of adhesive layer]
The surface of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples was used with a color 3D laser microscope [manufactured by Keyence Corporation, model: VK-9500], the lens magnification was 50 times, and the measurement mode was ultra-deep. The value of arithmetic average roughness (Ra) was measured at an arbitrary position (vertical 200 μm, horizontal 250 μm) with a pitch of 0.05 μm and an optical zoom of 1.0.

[Method for measuring the number of convex portions of the pressure-sensitive adhesive layer]
The surface of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples was arbitrarily set using a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500] with a lens magnification of 2.5 times And the number of convex portions having a height of 1 μm or more was counted.

[Measurement method of area occupied by convex part of adhesive layer]
The surface of the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples was arbitrarily set using a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500] with a lens magnification of 2.5 times The area of the convex part having a height of 1 μm or more was measured. The ratio of the area of the convex part with a height of 1 μm or more was calculated with respect to the total area (1 mm ² ).

[Measurement method of maximum depth of recess in release liner]
Using a color 3D laser microscope (manufactured by Keyence Corporation, model: VK-9500) on the surface of the release liner, the lens magnification is 50 times, the measurement mode is ultra-deep, the pitch is 0.05 μm, and the optical zoom is 1. The value of the maximum depth (Ry) was measured at an arbitrary place (vertical 200 μm, horizontal 250 μm) as 0 times.

[Measurement method of surface roughness (arithmetic mean roughness) of release liner]
Using a color 3D laser microscope (manufactured by Keyence Corporation, model: VK-9500) on the surface of the release liner, the lens magnification is 50 times, the measurement mode is ultra-deep, the pitch is 0.05 μm, and the optical zoom is 1. The value of arithmetic average roughness (Ra) was measured at an arbitrary position (vertical 200 μm, horizontal 250 μm) as 0 times.

[Method for measuring the number of recesses in the release liner]
The surface of the release liner is observed at an arbitrary location (1 mm in length and 1 mm in width) using a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500] with a lens magnification of 2.5 times. Then, the number of recesses having a depth of 1 μm or more was counted.

[Measurement method of the area occupied by the concave portion of the release liner]
The surface of the release liner is observed at an arbitrary location (1 mm in length and 1 mm in width) using a surface shape measuring device [manufactured by Toray Engineering Co., Ltd., model: SP-500] with a lens magnification of 2.5 times. Then, the area of the concave portion having a depth of 1 μm or more was measured. The ratio of the area of the concave portion having a depth of 1 μm or more with respect to the total area (1 mm ² ) was calculated.

[Measurement method of initial gel fraction]
Adhesive layered adhesive layer on release liner by applying water-dispersed acrylic adhesive obtained in Preparation Example on release liner so that thickness after drying is 65μm and drying A sheet was produced. Immediately after producing the pressure-sensitive adhesive sheet, the pressure-sensitive adhesive sheet was cut into a size of 50 mm in length and 40 mm in width and the release liner was peeled off to obtain a test piece.

Next, the mass (G ₀ ) of the test piece was measured. Next, the test piece was immersed in toluene at room temperature for 24 hours, and then filtered through a 300-mesh wire mesh to separate a residue that was insoluble in toluene and dried at 105 ° C. for 1 hour. The mass (G ₁ ) of the residue was measured. The gel fraction was calculated according to the mass (G ₀ ) of the test piece before immersion, the value of the mass (G ₁ ) of the residue, and the following formula.

Gel fraction (mass%) = (G ₁ / G ₀ ) × 100

[Measurement method of gel fraction after curing]
Adhesive layered adhesive layer on release liner by applying water-dispersed acrylic adhesive obtained in Preparation Example on release liner so that thickness after drying is 65μm and drying A sheet was produced. The pressure-sensitive adhesive sheet was cured for 48 hours in a 40 ° C. environment, then cut to a size of 50 mm in length and 40 mm in width (area 20 cm ² ), and the pressure-sensitive adhesive layer obtained by peeling off the release liner was used as a test piece. .

Next, the mass (G ₀ ) of the test piece was measured. Next, the test piece was immersed in toluene at room temperature for 24 hours, and then filtered through a 300-mesh wire mesh to separate a residue that was insoluble in toluene and dried at 105 ° C. for 1 hour. The mass (G ₁ ) of the residue was measured. The gel fraction was calculated according to the mass (G ₀ ) of the test piece before immersion, the value of the mass (G ₁ ) of the residue, and the following formula.

Gel fraction (mass%) = (G ₁ / G ₀ ) × 100

[Measurement method of glossiness (1) of adhesive layer]
The glossiness (1) of the pressure-sensitive adhesive layer was measured according to JIS Z 8741.

  The double-sided PSA sheets obtained in the Examples and Comparative Examples were cut into a size of 80 mm in length and 20 mm in width as a test piece. Immediately after peeling off the release liner laminated on one surface of the test piece in an environment of 23 ° C., the glossiness (1) of the surface of the pressure-sensitive adhesive layer (B1) constituting the test piece (initial glossiness) ) Was measured using a gloss meter [manufactured by Konica Minolta, model: GM-268Plus]. As a measurement condition, the measurement angle was fixed at 60 degrees.

[Measurement method of glossiness (2) of adhesive layer]
The glossiness (2) of the pressure-sensitive adhesive layer was measured according to JIS Z 8741.

  The double-sided PSA sheets obtained in the Examples and Comparative Examples were cut into a size of 80 mm in length and 20 mm in width as a test piece. After peeling off the release liner laminated on one side of the test piece, it was left in an environment of temperature 60 ° C. and humidity 0% RH for 500 hours, and then gloss meter [manufactured by Konica Minolta, model: GM- 268Plus], the surface glossiness (2) of the pressure-sensitive adhesive layer (B1) constituting the test piece was measured. As a measurement condition, the measurement angle was fixed at 60 degrees.

[Evaluation Method of Designability (1) (Evaluation of Jetness)]
The release liners on both sides of the double-sided PSA sheets obtained in Examples and Comparative Examples were peeled off, and the surface of the PSA layer of the double-sided PSA sheet was visually observed under an environment with indoor lighting of 500 lux. The observations were made by 5 evaluators. Of the evaluations made by the five evaluators, the most evaluated result was the design evaluation of the double-sided PSA sheet.

  The surface of the pressure-sensitive adhesive layer has a deep and deep color tone and excellent jetness, “◎”, the darkness is slightly low but practically black, “◯”, clearly black The light color (gray) that was slightly inferior in quality was evaluated as “Δ”, and the color on the back surface of the double-sided PSA sheet was confirmed as “x”.

[Evaluation Method for Designability (2) (Evaluation of Matting Property)]
The release liner laminated on the side of the pressure-sensitive adhesive layer (B1) constituting the double-sided pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples was peeled off and bonded to a punching sheet having a through hole with a diameter of 1 mm and a hole area ratio of 40%. Then, under an environment of indoor lighting of 500 lux, a 210-lumen LED lamp illumination was applied from a direction perpendicular to the punching sheet surface, and the degree of glare due to reflection of light from the through-hole on the punching sheet surface was visually observed. . Of the evaluations by the five evaluators, the most evaluated result was the design evaluation of the double-sided PSA sheet.

  “◎” indicates that glare due to light reflection from the through-hole on the punching sheet surface is not visually recognized, “○” indicates that glare is hardly visible and does not impair the design, and “glare” is visually recognized. The case where the designability was slightly impaired was evaluated as “Δ”, and the case where glare was visually recognized and the designability was greatly impaired was evaluated as “x”.

[Evaluation method of designability (3) (Evaluation of matte property after leaving in high temperature environment)]
The release liner laminated on the side of the pressure-sensitive adhesive layer (B1) constituting the double-sided pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples was peeled off and bonded to a punching sheet having a through hole with a diameter of 1 mm and a hole area ratio of 40%. Then, it was left for 500 hours in a temperature 60 ° C. and humidity 0% RH environment.

  In the environment where the room lighting is 500 lux, the left-handed object is illuminated with 210 lumens of LED light from a direction perpendicular to the punching sheet surface, and glare is caused by reflection of light from the through-hole on the punching sheet surface. Was observed visually. Of the evaluations made by the five evaluators, the most evaluated result was the design evaluation of the double-sided PSA sheet.

  “◎” indicates that glare due to light reflection from the through-hole on the punching sheet surface is not visually recognized, “○” indicates that glare is hardly visible and does not impair the design, and “glare” is visually recognized. The case where the designability was slightly impaired was evaluated as “Δ”, and the case where glare was visually recognized and the designability was greatly impaired was evaluated as “x”.

[Measurement method of adhesive strength (180 ° peel adhesive strength)]
The 180 ° peel adhesive strength was measured according to JIS Z 0237.

  The adhesive layer (B2) constituting the double-sided PSA sheet obtained in Examples and Comparative Examples is backed by attaching a polyethylene terephthalate (PET) film having a thickness of 25 μm to a size of 300 mm in length and 20 mm in width. The cut piece was used as a test piece.

  The test piece was placed on the adherend so that the other adhesive layer (B1) of the test piece was in contact with the surface of the adherend which was a polycarbonate plate or a polystyrene plate, and the temperature was 23 ° C. and the humidity was 50%. In an environment of RH, they were pasted by pressurizing and reciprocating once with a 2 kg roller.

  The patch was allowed to stand for 1 hour in an environment of a temperature of 23 ° C. and a humidity of 50% RH, and then a test piece was removed from the adherend using a Tensilon tensile tester [manufactured by A & D Co., Ltd., model: RTM-100]. The adhesive force when peeled off at a speed of 300 m / min in the degree direction was measured. The higher the measured value, the better the adhesion performance.

[Measurement method of holding force in shear direction]
The holding force was measured according to JIS Z 0237.
A test piece obtained by backing an aluminum foil having a thickness of 50 μm on the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples, and cutting it into a length of 100 mm and a width of 20 mm. It was.

  Next, in an environment of a temperature of 23 ° C. and a humidity of 50% RH, a stainless steel plate (SUS304 steel plate) is placed on the surface of the pressure-sensitive adhesive layer (B2) of the test piece so that the pasting area is 20 mm × 20 mm. They were placed by applying a reciprocating pressure using a 2 kg roller.

The patch was allowed to stand for 1 hour in an environment having a temperature of 23 ° C. and a humidity of 50% RH, and then in a 60 ° C. environment, the patch was placed on a holding force meter with a thermostatic bath [manufactured by Tester Sangyo Co., Ltd.] It was fixed so that (length direction) was perpendicular to the horizontal.
Next, a load of 0.5 kg was applied in the shearing direction of the patch by attaching a weight of 0.5 kg to the end of the test piece constituting the patch. The time until the test piece fell from the patch was measured. In addition, the test piece which did not fall after 1440 minutes (24 hours) passed was described as 1440 <. The higher the measured value, the better the adhesion performance.

(Preparation Example 1)
<Preparation of emulsion>
In a container, 75 g of ion-exchanged water and Aqualon KH-1025 [Daiichi Kogyo Seiyaku Co., Ltd .; active ingredient 25% by mass] as a surfactant and Latem PD-104 [Kao Co., Ltd .; active ingredient 20% by mass] 37.5 g was added and dissolved uniformly. 235 g of n-butyl acrylate, 235 g of 2-ethylhexyl acrylate, 15 g of methyl methacrylate, 7.5 g of acrylic acid, 7.5 g of methacrylic acid and 0.2 g of lauryl mercaptan were added and emulsified to obtain 632.7 g of an emulsion. .

<Preparation of aqueous dispersion of water-dispersed acrylic polymer>
A reaction vessel equipped with a stirrer, reflux condenser, nitrogen inlet tube, thermometer, and dropping funnel was charged with 333.35 g of ion-exchanged water, and the temperature was raised to 60 ° C. while blowing nitrogen. While stirring, a part of the emulsion prepared above [7.59 g], 2.5 g of ammonium persulfate aqueous solution [6% by mass of active ingredient], 2.5 g of sodium hydrogen sulfite aqueous solution [6% by mass of active ingredient] were added, Polymerization was performed in 1 hour while maintaining 60 ° C.

  Subsequently, 625.11 g of the remaining emulsion and 50 g of an aqueous solution of 2,2′-azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride (water-soluble azo initiator) [1 mass of active ingredient] %] Was dropped using a separate funnel over 6 hours while keeping the reaction vessel at 60 ° C., and the mixture was stirred for 1 hour while keeping the reaction vessel at 60 ° C. after completion of dropping.

  Next, 2.5 g of an aqueous solution of ammonium persulfate [6% by mass of the active ingredient] and 2.5 g of an aqueous solution of sodium hydrogen sulfite [6% by mass of the active ingredient] are supplied dropwise to the reaction vessel over 1 hour using separate funnels. After polymerization, the reaction vessel was stirred for 1 hour while maintaining at 60 ° C.

  Next, the contents of the reaction vessel were cooled and adjusted with ammonia water (active ingredient 10% by mass) so that the pH was 7.5. This was filtered through a 200-mesh wire mesh to obtain an aqueous dispersion (1) [solid content concentration of 50% by mass] of an aqueous dispersion type acrylic polymer. The acrylic copolymer had an average particle size of 300 nm and a weight average molecular weight of 700,000.

<Preparation of water-dispersed acrylic pressure-sensitive adhesive composition (1)>
Superester E-865NT [made by Arakawa Chemical Industries, Ltd .; emulsion-type polymerized rosin ester-based tackifier resin, softening point 160, to 1000 g of the aqueous dispersion (1) of the water-dispersed acrylic polymer described above, as a tackifier resin. ℃, solid concentration 50% by mass] 300 g, Surfinol PSA-336 [manufactured by Air Products Japan Co., Ltd.] 2.5 g as a leveling agent, Surfynol DF-110D [Air Products Japan (as an antifoaming agent) Co., Ltd.] 2.5 g was added to obtain a water-dispersed acrylic pressure-sensitive adhesive composition (1). The initial gel fraction of the pressure-sensitive adhesive layer measured using the obtained water-dispersed acrylic pressure-sensitive adhesive composition (1) according to the method described in “Method for measuring initial gel fraction” is 0.00. It was 1% by mass.

  To the total amount of the obtained water-dispersed acrylic pressure-sensitive adhesive composition (1), 6 g of a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was added as a crosslinking agent. Stir for hours.

  Next, 20 g of PSM black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration of 31 mass%] was added as a colorant, and the mixture was stirred for 1 hour, and an aqueous dispersion type acrylic pressure-sensitive adhesive (1) was obtained. In addition, using the obtained water-dispersed acrylic pressure-sensitive adhesive (1), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer. Was 0.3%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing, measured according to the method described in the above-mentioned “Method for measuring gel fraction after curing”, using the obtained water-dispersed acrylic pressure-sensitive adhesive (1), It was 65.6% by mass.

(Preparation Example 2)
Water in the same manner as in Preparation Example 1 except that the blending amount of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] was changed from 20 g to 40 g. A dispersion-type acrylic pressure-sensitive adhesive (2) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (2), the total light transmittance of the pressure-sensitive adhesive layer obtained by the measurement according to the method of “Measurement of total light transmittance of pressure-sensitive adhesive layer” is as follows: 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (2) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 65.7 mass%.

(Preparation Example 3)
The same method as in Preparation Example 1 except that the blending amount of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] was changed from 20 g to 60 g. A water-dispersed acrylic pressure-sensitive adhesive (3) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (3), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured according to the method described in the above-mentioned “Method for measuring gel fraction after curing”, using the obtained water-dispersed acrylic pressure-sensitive adhesive (3), It was 67.3 mass%.

(Preparation Example 4)
The same method as in Preparation Example 1 except that the blending amount of PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] was changed from 20 g to 100 g. A water-dispersed acrylic pressure-sensitive adhesive (4) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (4), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (4) according to the method described in "Method for measuring gel fraction after curing" It was 67.4% by mass.

(Preparation Example 5)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 1, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 3.5 g. An adhesive (5) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (5), the total light transmittance measured by the method of “Measurement method of total light transmittance of pressure-sensitive adhesive layer” was 0.3%. Met. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (5) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 54.4% by mass.

(Preparation Example 6)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 2, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 3.5 g. An adhesive (6) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (6), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (6) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 54.4% by mass.

(Preparation Example 7)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 3, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 3.5 g. An adhesive (7) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (7), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (7) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 55.2% by mass.

(Preparation Example 8)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 4 except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 3.5 g. An adhesive (8) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (8), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the method of “Measurement method of total light transmittance of pressure-sensitive adhesive layer” is as follows: 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (8) according to the method described in "Method for measuring gel fraction after curing" It was 54.5 mass%.

(Preparation Example 9)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 1, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 1.5 g. An adhesive (9) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (9), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.3%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (9) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 33.8 mass%.

(Preparation Example 10)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 2, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 1.5 g. An adhesive (10) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (10), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (10) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 33.8 mass%.

(Preparation Example 11)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 3, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 1.5 g. An adhesive (11) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (11), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (11) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 34.1 mass%.

(Preparation Example 12)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 4 except that the amount of 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 1.5 g. An adhesive (12) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (12), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (12) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 34.4% by mass.

(Preparation Example 13)
The amount of acrylic acid used was changed from 7.5 g to 15 g, and the amount of methacrylic acid was changed from 7.5 g to 0 g. 2) was prepared. The aqueous dispersion of the water-dispersed acrylic polymer (2) obtained here had a solid content concentration of 50% by mass, an average particle size of 330 nm, and a weight average molecular weight of 720,000.

  A water-dispersed acrylic pressure-sensitive adhesive composition was prepared in the same manner as in Preparation Example 1, except that the water-dispersed acrylic polymer (2) was used instead of the water-dispersed acrylic polymer (1). (2) was prepared. Using the obtained water-dispersed acrylic pressure-sensitive adhesive composition (2), the gel fraction measured according to the method described in “Method for measuring initial gel fraction” was 0.1% by mass.

  Next, the water-dispersed acrylic was prepared in the same manner as in Preparation Example 2, except that the water-dispersed acrylic pressure-sensitive adhesive composition (2) was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1). A pressure-sensitive adhesive (13) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (13), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (13) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 66.3 mass%.

(Preparation Example 14)
Water-dispersed acrylic adhesive in the same manner as in Preparation Example 13 except that the amount of 10% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 3.5 g. Agent (14) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (14), the total light transmittance of the pressure-sensitive adhesive layer obtained by measurement by the method of “Measurement method of total light transmittance of pressure-sensitive adhesive layer” is as follows: 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (14) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 54.8% by mass.

(Preparation Example 15)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 13, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 1.5 g. An adhesive (15) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (15), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (15) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 33.8 mass%.

(Preparation Example 16)
Instead of superester E-865NT [emulsion-type polymerized rosin ester-based tackifier resin] 300 g which is a tackifier resin, Tamanol E-200NT [manufactured by Arakawa Chemical Industries, Ltd .; emulsion-type rosin phenol-based tackifier resin, softening point A water-dispersed acrylic pressure-sensitive adhesive (16) was obtained in the same manner as in Preparation Example 13, except that 283 g at 150 ° C. and a solid content concentration of 53 mass%] was used.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (16), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (16) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 65.8 mass%.

(Preparation Example 17)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 16 except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 3.5 g. An adhesive (17) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (17), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (17) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 53.9% by mass.

(Preparation Example 18)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 16, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 1.5 g. An adhesive (18) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (18), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing was measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (18) according to the method described in “Method for measuring gel fraction after curing”. It was 33.7 mass%.

(Preparation Example 19)
Except that the amount of n-butyl acrylate used was changed from 235 g to 150 g and the amount of 2-ethylhexyl acrylate used was changed from 235 g to 320 g, a water-dispersed acrylic polymer ( 3) was prepared.

  A water-dispersed acrylic pressure-sensitive adhesive composition (in the same manner as in Preparation Example 1 except that the water-dispersed acrylic polymer (3) was used instead of the water-dispersed acrylic polymer (1). 3) was prepared. Using the water-dispersed acrylic pressure-sensitive adhesive composition (3), the initial gel fraction of the pressure-sensitive adhesive layer measured according to the method described in “Method for measuring initial gel fraction” was 0.2% by mass. It was.

  Next, in the same manner as in Preparation Example 6, except that the water-dispersed acrylic pressure-sensitive adhesive composition (2) was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), the water-dispersed acrylic A system pressure-sensitive adhesive (19) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (19), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (19) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 55.9 mass%.

(Preparation Example 20)
A water-dispersed type was prepared in the same manner as in Preparation Example 19 except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 3.5 g to 1.5 g. An acrylic pressure-sensitive adhesive (20) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (20), the total light transmittance of the pressure-sensitive adhesive layer obtained by measurement by the method of “Measurement method of total light transmittance of pressure-sensitive adhesive layer” is as follows: 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (20) according to the method described in "Method for measuring gel fraction after curing" It was 34.4% by mass.

(Preparation Example 21)
Except that the amount of n-butyl acrylate used was changed from 235 g to 320 g and the amount of 2-ethylhexyl acrylate was changed from 235 g to 150 g, a water-dispersed acrylic polymer ( 4) was prepared.

  A water-dispersed acrylic pressure-sensitive adhesive composition (in the same manner as in Preparation Example 1 except that the water-dispersed acrylic polymer (4) was used instead of the water-dispersed acrylic polymer (1). 4) was prepared. Using the water-dispersed acrylic pressure-sensitive adhesive composition (4), the initial gel fraction of the pressure-sensitive adhesive layer measured according to the method described in “Method for measuring initial gel fraction” was 0.1% by mass. It was.

  Next, in the same manner as in Preparation Example 6, except that the water-dispersed acrylic pressure-sensitive adhesive composition (4) was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), the water-dispersed type An acrylic pressure-sensitive adhesive (21) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (21), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (21) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 53.8% by mass.

(Preparation Example 22)
A water-dispersed type was prepared in the same manner as in Preparation Example 21, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 3.5 g to 1.5 g. An acrylic pressure-sensitive adhesive (22) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (22), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (22) according to the method described in "Method for measuring gel fraction after curing" It was 33.5% by mass.

(Preparation Example 23)
Except that the amount of n-butyl acrylate was changed from 235 g to 335 g, the amount of 2-ethylhexyl acrylate was changed from 235 g to 150 g, and the amount of methyl methacrylate was changed from 15 g to 0 g, A water-dispersed acrylic polymer (5) was prepared in the same manner.

  A water-dispersed acrylic pressure-sensitive adhesive composition (5) was prepared in the same manner as in Preparation Example 1, except that the water-dispersed acrylic polymer (5) was used instead of the water-dispersed acrylic polymer (1). ) Was prepared. Using the water-dispersed acrylic pressure-sensitive adhesive composition (5), the initial gel fraction of the pressure-sensitive adhesive layer measured according to the method described in “Method for measuring initial gel fraction” was 0.1% by mass. It was.

  Next, in the same manner as in Preparation Example 6, except that the water-dispersed acrylic pressure-sensitive adhesive composition (5) was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), the water-dispersed type An acrylic pressure-sensitive adhesive (23) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (23), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-mentioned method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. The gel fraction of the pressure-sensitive adhesive layer after curing was measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (23) according to the method described in “Method for measuring gel fraction after curing”. It was 54.1% by mass.

(Preparation Example 24)
A water-dispersed type was prepared in the same manner as in Preparation Example 23, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 3.5 g to 1.5 g. An acrylic pressure-sensitive adhesive (24) was obtained.

  Using the obtained water-dispersed acrylic pressure-sensitive adhesive (24), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-mentioned method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (24) according to the method described in "Method for measuring gel fraction after curing" It was 33.8 mass%.

(Preparation Example 25)
A water-dispersed acrylic polymer (in the same manner as in Preparation Example 24) except that the amount of n-butyl acrylate was changed from 335 g to 435 g and the amount of 2-ethylhexyl acrylate was changed from 150 g to 50 g. 6) was prepared.

  The water-dispersed acrylic pressure-sensitive adhesive composition (6) was prepared in the same manner as in Preparation Example 1, except that the water-dispersed acrylic polymer (6) was used instead of the water-dispersed acrylic polymer (1). ) Was prepared. Using the obtained water-dispersed acrylic pressure-sensitive adhesive composition (6), the initial gel fraction of the pressure-sensitive adhesive layer measured according to the method described in “Method for measuring initial gel fraction” was 0.1 mass. %Met.

  Next, in the same manner as in Preparation Example 6, except that the water-dispersed acrylic pressure-sensitive adhesive composition (6) was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), the water-dispersed type An acrylic pressure-sensitive adhesive (25) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (25), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (25) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 53.7% by mass.

(Preparation Example 26)
A water-dispersed type was prepared in the same manner as in Preparation Example 25, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 3.5 g to 1.5 g. An acrylic pressure-sensitive adhesive (26) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (26), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (26) according to the method described in "Method for measuring gel fraction after curing" It was 33.3 mass%.

(Preparation Example 27)
Instead of 10 mass% ethanol solution of Tetrad C [Mitsubishi Gas Chemical Co., Ltd., epoxy compound], Epocros WS-700 [Nippon Shokubai Co., Ltd., nonvolatile concentration 25 mass%, oxazoline-based cross-linking agent] 90 g A water-dispersed acrylic pressure-sensitive adhesive (27) was obtained in the same manner as in Preparation Example 2, except that it was used. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (27), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (27) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 62.5% by mass.

(Preparation Example 28)
A water-dispersed type was prepared in the same manner as in Preparation Example 27, except that the amount of Epocros WS-700 [manufactured by Nippon Shokubai Co., Ltd., non-volatile content 25% by mass, oxazoline-based cross-linking agent] was changed from 90 g to 60 g. An acrylic pressure-sensitive adhesive (28) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (28), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (28) according to the method described in "Method for measuring gel fraction after curing" It was 46.4 mass%.

(Preparation Example 29)
A water-dispersed type was prepared in the same manner as in Preparation Example 27, except that the amount of Epocros WS-700 [Nippon Shokubai Co., Ltd., non-volatile content 25 mass%, oxazoline-based cross-linking agent] was changed from 90 g to 30 g. An acrylic pressure-sensitive adhesive (29) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (29), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (29) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 28.8 mass%.

(Preparation Example 30)
A water-dispersed type was prepared in the same manner as in Preparation Example 27, except that the amount of Epocros WS-700 [manufactured by Nippon Shokubai Co., Ltd., nonvolatile content concentration 25 mass%, oxazoline-based crosslinking agent] was changed from 90 g to 14 g. An acrylic pressure-sensitive adhesive (29) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (29), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (29) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 19.3 mass%.

(Preparation Example 31)
A water-dispersed acrylic pressure-sensitive adhesive (31) was obtained in the same manner as in Preparation Example 23, except that a 10% by mass ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was not used. It was. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (31), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing, measured according to the method described in the above “Method for measuring gel fraction after curing”, using the obtained water-dispersed acrylic pressure-sensitive adhesive (31), It was 1.5 mass%.

(Preparation Example 32)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 23, except that PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration 31 mass%] was not used. An adhesive (32) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (32), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-mentioned method of measuring the total light transmittance of the pressure-sensitive adhesive layer is It was 88.6%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (32) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 52.6 mass%.

(Preparation Example 33)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 24, except that PSM Black C [manufactured by Mikuni Dye Co., Ltd., carbon black content: 25 mass%, solid content concentration: 31 mass%] was not used. An adhesive (33) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (33), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is It was 88.5%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (33) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 33.7 mass%.

(Preparation Example 34)
Preparation Example, except that the amount of n-butyl acrylate was changed from 235 g to 232.5 g, the amount of 2-ethylhexyl acrylate was changed from 235 g to 232.5 g, and 5 g of N-vinylpyrrolidone was used. In the same manner as in No. 1, a water-dispersed acrylic polymer (7) was prepared.

  A water-dispersed acrylic pressure-sensitive adhesive composition (in the same manner as in Preparation Example 1 except that the water-dispersed acrylic polymer (7) was used instead of the water-dispersed acrylic polymer (1). 7) was prepared. Using the water-dispersed acrylic pressure-sensitive adhesive composition (7), the initial gel fraction of the pressure-sensitive adhesive layer measured according to the method described in “Method for measuring initial gel fraction” was 0.1% by mass. It was.

  Next, in the same manner as in Preparation Example 2, except that the water-dispersed acrylic pressure-sensitive adhesive composition (7) was used instead of the water-dispersed acrylic pressure-sensitive adhesive composition (1), the water-dispersed type An acrylic pressure-sensitive adhesive (34) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (34), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (34) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 65.5% by mass.

(Preparation Example 35)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 34, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 3.5 g. An adhesive (35) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (35), the total light transmittance of the pressure-sensitive adhesive layer obtained by measuring by the above-mentioned method of measuring the total light transmittance of the pressure-sensitive adhesive layer is 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured using the obtained water-dispersed acrylic pressure-sensitive adhesive (35) according to the method described in “Method for measuring gel fraction after curing” is as follows: It was 53.5% by mass.

(Preparation Example 36)
A water-dispersed acrylic system was prepared in the same manner as in Preparation Example 34, except that the amount of 10 mass% ethanol solution of Tetrad C [manufactured by Mitsubishi Gas Chemical Co., Ltd., epoxy compound] was changed from 6 g to 1.5 g. An adhesive (36) was obtained. Using the obtained water-dispersed acrylic pressure-sensitive adhesive (36), the total light transmittance of the pressure-sensitive adhesive layer obtained by the above-described method for measuring the total light transmittance of the pressure-sensitive adhesive layer was 0. 0.0%. Moreover, the gel fraction of the pressure-sensitive adhesive layer after curing measured according to the method described in the above-mentioned “Method for measuring gel fraction after curing”, using the obtained water-dispersed acrylic pressure-sensitive adhesive (36), It was 33.7 mass%.

  The formulation table for the above preparation examples is shown in the table below. “Mass%” described in the column of “monomer” in the table represents the proportion of each monomer used relative to the total amount of monomer components constituting the acrylic polymer, "Represents a part by mass of the tackifier resin with respect to 100 parts by mass of the acrylic polymer," mass part "of the crosslinking agent represents a part by mass of the crosslinking agent with respect to 100 parts by mass of the acrylic polymer, and" mass of carbon black " "Part" represents the mass part of the carbon black as the colorant with respect to 100 parts by mass of the acrylic polymer.

Example 1
The water-dispersed acrylic pressure-sensitive adhesive (1) obtained in Preparation Example 1 was applied to the matte side of the matte release liner (1) [Lintech Co., Ltd., trade name: WHKR-65FNR modified] having irregularities. The pressure-sensitive adhesive sheet (M1) provided with a pressure-sensitive adhesive layer on the surface of the matte release liner (1) was coated on the surface so that the thickness after drying was 65 μm and dried at 100 ° C. for 5 minutes. -1) was obtained.

  Next, the water-dispersed acrylic pressure-sensitive adhesive (9) obtained in Preparation Example 9 was used as a semi-mirror side of a semi-mirror release liner (4) [manufactured by Sumika Kogyo Co., Ltd., trade name: DLS-78WTL] The pressure-sensitive adhesive sheet provided with a pressure-sensitive adhesive layer on the surface of the semi-mirror-like release liner (4) by coating the surface of the film so that the thickness after drying is 65 μm and drying at 100 ° C. for 5 minutes. S1-9) was obtained.

  Next, the pressure-sensitive adhesive sheet (M1-1) was bonded to one side of a non-woven fabric base material [product of Isagawa Paper Co., Ltd., trade name: DI-Tex LCN, pulp / rayon (mass ratio) = 5/5]. The adhesive layer which the said adhesive sheet (S1-9) has was transcribe | transferred to one side, and the double-sided adhesive sheet was obtained.

  The total light transmittance of the obtained double-sided PSA sheet was 0.0%. Moreover, it was 16.1 micrometers when the maximum height of the convex part of the adhesive layer (B1) of the obtained said double-sided adhesive sheet was measured by the above-mentioned method. It was 2.20 micrometers when the surface roughness of the adhesive layer (B1) of the said double-sided adhesive sheet was measured by the above-mentioned method. When the number of convex parts of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was measured by the method described above, it was 400. It was 20% when the area which the convex part of the adhesive layer (B1) of the said double-sided adhesive sheet occupied was measured by the above-mentioned method.

In addition, the total light transmittance of the said nonwoven fabric base material used for manufacture of the said double-sided adhesive sheet is 73.5% when measured by the above-mentioned method, The basic weight is 14 g / m < ² >, The thickness Was 38 μm.

  Moreover, the maximum depth of the concave portion of the release liner (1) used for the production of the double-sided pressure-sensitive adhesive sheet was 17.8 μm as measured by the method described above, and the surface roughness of the release liner (1). Was 2.18 μm, the number of concave portions of the release liner (1) was 400, and the area occupied by the concave portions of the release liner (1) was 20%.

  The depth of the concave portion of the release liner (4) is 0.6 μm, the surface roughness of the release liner (4) is 0.09 μm, and the number of concave portions of the release liner (4). Was 0, and the area occupied by the concave portion of the release liner (4) was 0%.

(Example 2)
Instead of the mat-like release liner (1) having irregularities, a mat-like release liner (2) having irregularities [manufactured by Sumika Kogyo Co., Ltd., trade name: DLS-78WTL (S mat)] A pressure-sensitive adhesive sheet (M2-1) having a pressure-sensitive adhesive layer on the surface of the matte release liner (2) was obtained in the same manner as in Example 1, except that was used.

  A double-sided PSA sheet was produced in the same manner as in Example 1 except that the PSA sheet (M2-1) was used instead of the PSA sheet (M1-1).

  The total light transmittance of the obtained double-sided PSA sheet was 0.0%. The maximum height of the convex portion of the pressure-sensitive adhesive layer (B1) of the obtained double-sided pressure-sensitive adhesive sheet is 3.6 μm, and the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.51 μm. Yes, the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

  The depth of the recess of the release liner (2) used for the production of the double-sided pressure-sensitive adhesive sheet is 3.6 μm, the surface roughness of the release liner (2) is 0.50 μm, and the release liner The number of recesses in the mold liner (2) was 400, and the area occupied by the recesses in the release liner (2) was 35%.

(Example 3)
The same method as in Example 1 except that the release liner (3) [trade name: KNP-78 Shiro (HO-R2)] manufactured by Lintec Corporation was used instead of the release liner (1). Thus, a pressure-sensitive adhesive sheet (M3-1) having a pressure-sensitive adhesive layer on the surface of the matte release liner (3) was obtained.

  A double-sided PSA sheet was produced in the same manner as in Example 1 except that the PSA sheet (M3-1) was used instead of the PSA sheet (M1-1).

  The total light transmittance of the obtained double-sided PSA sheet was 0.0%. The maximum height of the convex portion of the pressure-sensitive adhesive layer (B1) of the obtained double-sided pressure-sensitive adhesive sheet is 2.3 μm, and the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.27 μm. Yes, the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 200, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 18%.

  The depth of the concave portion of the release liner (3) used for the production of the double-sided pressure-sensitive adhesive sheet is 2.3 μm, the surface roughness of the release liner (3) is 0.27 μm, and the release liner The number of recesses in the mold liner (3) was 196, and the area occupied by the recesses in the release liner (3) was 18%.

Example 4
A mat-like separation was obtained in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (2) obtained in Preparation Example 2 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-2) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  Semi-mirror-like mold release in the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive (10) obtained in Preparation Example 10 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (9). A pressure-sensitive adhesive sheet (S1-10) having a pressure-sensitive adhesive layer on the surface of the liner (4) was prepared.

  Example except that the pressure-sensitive adhesive sheet (M2-2) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-10) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The total light transmittance of the obtained double-sided PSA sheet was 0.0%. Moreover, the maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the obtained double-sided pressure-sensitive adhesive sheet is 3.5 μm, and the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.52 μm. Yes, the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 5)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (3) obtained in Preparation Example 3 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-3) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  In the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive (11) obtained in Preparation Example 11 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror-like separation was achieved. A pressure-sensitive adhesive sheet (S1-11) having a pressure-sensitive adhesive layer on the surface of the mold liner (4) was produced.

  Example except that the pressure-sensitive adhesive sheet (M2-3) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-10) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The total light transmittance of the obtained double-sided PSA sheet was 0.0%. The maximum height of the convex portion of the pressure-sensitive adhesive layer (B1) of the obtained double-sided pressure-sensitive adhesive sheet is 3.6 μm, and the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.51 μm. Yes, the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 6)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (4) obtained in Preparation Example 4 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-4) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  In the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive (12) obtained in Preparation Example 12 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror-like separation was achieved. A pressure-sensitive adhesive sheet (S1-12) having a pressure-sensitive adhesive layer on the surface of the mold liner (4) was produced.

  Example except that the pressure-sensitive adhesive sheet (M2-4) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-12) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The total light transmittance of the obtained double-sided PSA sheet was 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.6 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.50 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 7)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (5) obtained in Preparation Example 5 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-5) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was prepared in the same manner as in Example 2 except that the PSA sheet (M2-5) was used instead of the PSA sheet (M2-1).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.6 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.54 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 8)
Matte separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (6) obtained in Preparation Example 6 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-6) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 4 except that the PSA sheet (M2-6) was used instead of the PSA sheet (M2-1).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex portion of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.53 μm, and the double-sided pressure-sensitive adhesive layer The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

Example 9
A mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (7) obtained in Preparation Example 7 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-7) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 5 except that the PSA sheet (M2-7) was used instead of the PSA sheet (M2-1).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.51 μm, and the double-sided pressure-sensitive adhesive layer The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35% as measured by the method described above. .

(Example 10)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (8) obtained in Preparation Example 8 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-8) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 6 except that the PSA sheet (M2-8) was used instead of the PSA sheet (M2-1).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.4 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.52 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 11)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (13) obtained in Preparation Example 13 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-13) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  Further, in the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive (15) obtained in Preparation Example 15 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone was prepared. A pressure-sensitive adhesive sheet (S1-15) having a pressure-sensitive adhesive layer on the surface of the release liner (4) was prepared.

  Example except that the pressure-sensitive adhesive sheet (M2-13) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-15) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.51 μm, and the double-sided pressure-sensitive adhesive layer The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 12)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (14) obtained in Preparation Example 14 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-14) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 11 except that the PSA sheet (M2-14) was used instead of the PSA sheet (M2-13).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex portion of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.50 μm, and the double-sided pressure-sensitive adhesive layer The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 13)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (16) obtained in Preparation Example 16 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-16) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  Further, in the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive (18) obtained in Preparation Example 18 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone was obtained. An adhesive sheet (S1-18) having an adhesive layer on the surface of the release liner (4) was prepared.

  Example except that the pressure-sensitive adhesive sheet (M2-16) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-18) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.4 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.52 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 14)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (17) obtained in Preparation Example 17 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-17) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 13 except that the PSA sheet (M2-17) was used instead of the PSA sheet (M2-16).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.6 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.51 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 15)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (19) obtained in Preparation Example 19 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-19) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  Further, in the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive (20) obtained in Preparation Example 20 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone was obtained. An adhesive sheet (S1-20) having an adhesive layer on the surface of the release liner (4) was prepared.

  Example except that the pressure-sensitive adhesive sheet (M2-19) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-20) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex portion of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.50 μm, and the double-sided pressure-sensitive adhesive layer The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 16)
The mat-like separation was performed in the same manner as in Example 2, except that the water-dispersed acrylic pressure-sensitive adhesive (21) obtained in Preparation Example 21 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-21) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  Further, in the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive (22) obtained in Preparation Example 22 was used in place of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone was obtained. A pressure-sensitive adhesive sheet (S1-22) having a pressure-sensitive adhesive layer on the surface of the release liner (4) was prepared.

  Example except that the pressure-sensitive adhesive sheet (M2-21) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-22) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.4 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.54 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 17)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (23) obtained in Preparation Example 23 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-23) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  Further, in the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive (24) obtained in Preparation Example 24 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone was prepared. A pressure-sensitive adhesive sheet (S1-24) having a pressure-sensitive adhesive layer on the surface of the release liner (4) was prepared.

  Example except that the pressure-sensitive adhesive sheet (M2-23) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-24) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.3 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.55 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 18)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (25) obtained in Preparation Example 25 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-25) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  Further, in the same manner as in Example 1, except that the water-dispersed acrylic pressure-sensitive adhesive (26) obtained in Preparation Example 26 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone was prepared. A pressure-sensitive adhesive sheet (S1-26) having a pressure-sensitive adhesive layer on the surface of the release liner (4) was prepared.

  Example except that the pressure-sensitive adhesive sheet (M2-25) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-26) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.4 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.53 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 19)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (27) obtained in Preparation Example 27 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-27) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  Further, in the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive (29) obtained in Preparation Example 29 was used in place of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone was prepared. A pressure-sensitive adhesive sheet (S1-29) having a pressure-sensitive adhesive layer on the surface of the release liner (4) was prepared.

  Example except that the pressure-sensitive adhesive sheet (M2-27) was used instead of the pressure-sensitive adhesive sheet (M2-1), and the pressure-sensitive adhesive sheet (S1-29) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.4 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.54 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 20)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (28) obtained in Preparation Example 28 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-28) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 19 except that the PSA sheet (M2-28) was used instead of the PSA sheet (M2-27).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex portion of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.54 μm, and the double-sided pressure-sensitive adhesive The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 21)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (34) obtained in Preparation Example 34 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-34) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  Further, in the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive (36) obtained in Preparation Example 36 was used in place of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone was prepared. A pressure-sensitive adhesive sheet (S1-36) having a pressure-sensitive adhesive layer on the surface of the release liner (4) was prepared.

  Example except that the pressure-sensitive adhesive sheet (M2-34) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-36) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.6 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.51 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Example 22)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (35) obtained in Preparation Example 35 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-35) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 21 except that the PSA sheet (M2-35) was used instead of the PSA sheet (M2-34).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.52 μm, and the double-sided pressure-sensitive adhesive The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 1)
A pressure-sensitive adhesive layer was formed on the surface of the semi-mirror tone release liner (4) in the same manner as in Example 1 except that the semi-mirror tone release liner (4) was used instead of the release liner (1). A pressure-sensitive adhesive sheet (S1-1) provided with was obtained.

  A double-sided PSA sheet was produced in the same manner as in Example 1 except that the PSA sheet (S1-1) was used instead of the PSA sheet (M1-1).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. Moreover, the maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the obtained double-sided pressure-sensitive adhesive sheet is 0.6 μm, and the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.08 μm. Yes, the number of convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 0, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 0%.

(Comparative Example 2)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (9) obtained in Preparation Example 9 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-9) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 2 except that the PSA sheet (M2-9) was used instead of the PSA sheet (M2-1).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.52 μm, and the double-sided pressure-sensitive adhesive The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 3)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (10) obtained in Preparation Example 10 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-10) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 4 except that the PSA sheet (M2-10) was used instead of the PSA sheet (M2-2).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.51 μm, and the double-sided pressure-sensitive adhesive layer The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 4)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (11) obtained in Preparation Example 11 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-11) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 5 except that the PSA sheet (M2-11) was used instead of the PSA sheet (M2-3).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.4 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.52 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 5)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (12) obtained in Preparation Example 12 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-12) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 6 except that the PSA sheet (M2-12) was used instead of the PSA sheet (M2-4).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.51 μm, and the double-sided pressure-sensitive adhesive layer The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 6)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (15) obtained in Preparation Example 15 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-15) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 11 except that the PSA sheet (M2-15) was used instead of the PSA sheet (M2-13).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.52 μm, and the double-sided pressure-sensitive adhesive The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 7)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (18) obtained in Preparation Example 18 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-18) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 13 except that the PSA sheet (M2-18) was used instead of the PSA sheet (M2-16).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.4 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.54 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 8)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (29) obtained in Preparation Example 29 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-29) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Example 19 except that the PSA sheet (M2-29) was used instead of the PSA sheet (M2-27).

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.4 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.53 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 9)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (30) obtained in Preparation Example 30 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-30) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  In the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive (30) obtained in Preparation Example 30 was used in place of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone separation was performed. A pressure-sensitive adhesive sheet (S1-30) having a pressure-sensitive adhesive layer on the surface of the mold liner (4) was obtained.

  Example except that the pressure-sensitive adhesive sheet (M2-30) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-30) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.3 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.55 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 10)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (31) obtained in Preparation Example 31 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-31) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  In the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive (31) obtained in Preparation Example 31 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror-like separation was achieved. A pressure-sensitive adhesive sheet (S1-31) having a pressure-sensitive adhesive layer on the surface of the mold liner was obtained.

  Example except that the pressure-sensitive adhesive sheet (M2-31) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-31) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 0.0%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.55 μm, and the double-sided pressure-sensitive adhesive The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 11)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (32) obtained in Preparation Example 32 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-32) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  In the same manner as in Example 1 except that the water-dispersed acrylic pressure-sensitive adhesive (33) obtained in Preparation Example 33 was used in place of the water-dispersed acrylic pressure-sensitive adhesive (9), a semi-mirror tone separation was performed. A pressure-sensitive adhesive sheet (S1-33) having a pressure-sensitive adhesive layer on the surface of the mold liner (4) was obtained.

  Example except that the pressure-sensitive adhesive sheet (M2-32) was used instead of the pressure-sensitive adhesive sheet (M2-1) and the pressure-sensitive adhesive sheet (S1-33) was used instead of the pressure-sensitive adhesive sheet (S1-9). A double-sided PSA sheet was prepared in the same manner as in 2.

  The obtained double-sided PSA sheet had a total light transmittance of 82.5%. The maximum height of the convex portion of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.5 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.54 μm, and the double-sided pressure-sensitive adhesive The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

(Comparative Example 12)
The mat-like separation was performed in the same manner as in Example 2 except that the water-dispersed acrylic pressure-sensitive adhesive (33) obtained in Preparation Example 33 was used instead of the water-dispersed acrylic pressure-sensitive adhesive (1). A pressure-sensitive adhesive sheet (M2-33) having a pressure-sensitive adhesive layer on the surface of the mold liner (2) was produced.

  A double-sided PSA sheet was produced in the same manner as in Comparative Example 11 except that the PSA sheet (M2-33) was used instead of the PSA sheet (M2-32).

  The obtained double-sided PSA sheet had a total light transmittance of 82.5%. The maximum height of the convex part of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 3.3 μm, the surface roughness of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet is 0.54 μm, The number of convex portions of the pressure-sensitive adhesive layer (B1) of the sheet was 400, and the area occupied by the convex portions of the pressure-sensitive adhesive layer (B1) of the double-sided pressure-sensitive adhesive sheet was 35%.

  The following table shows the results of the above evaluations on the release liner used in the examples and comparative examples and the produced double-sided PSA sheet.

  As is clear from the above table, the pressure-sensitive adhesive sheets of the present invention shown in Examples 1 to 22 have good design properties and matte properties, have excellent adhesion and holding power, and have good peeling resistance. Secured. On the other hand, the pressure-sensitive adhesive sheets of Comparative Examples 11 to 12 are poor in jet blackness, Comparative Example 1 is poor in matte properties in a normal state, and the pressure-sensitive adhesive sheets of Comparative Examples 1 to 10 and Comparative Example 12 are left after being left for a long time. The adhesive sheets of Comparative Example 9 and Comparative Example 10 had poor matting properties, and the adhesive strength to the adherend was significantly deteriorated, and the holding power in the shear direction was poor.

Claims (10)

A double-sided pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer (B1) on one side of the nonwoven fabric substrate (A) and the pressure-sensitive adhesive layer (B2) on the other side, wherein the pressure-sensitive adhesive layer (B1) is acrylic. A layer formed using an aqueous pressure-sensitive adhesive containing a polymer (b1-1) and a colorant (b1-2), wherein the colorant (b1-2) is the whole pressure-sensitive adhesive layer (B1) The initial glossiness of the surface of the pressure-sensitive adhesive layer (B1) is 20% or less, and the gel fraction of the pressure-sensitive adhesive layer (B1) is 45 mass%. double-sided PSA sheet% Ri ~ range der of 78 wt%, the gel fraction of the pressure-sensitive adhesive layer (B2) is characterized in that it is a range of 25% to 50% by weight. The surface of the pressure-sensitive adhesive layer (B1) has an uneven shape, and there are 100 to 1600 convex portions having a height of 1 μm or more per 1 mm ² of the surface area of the pressure-sensitive adhesive layer (B1). Item 2. The double-sided pressure-sensitive adhesive sheet according to item 1. The double-sided pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the aqueous pressure-sensitive adhesive further contains a crosslinking agent (b1-3), and the crosslinking agent (b1-3) is an epoxy-based crosslinking agent. The double-sided pressure-sensitive adhesive sheet according to any one of claims 1 to 3 , wherein the total thickness is 200 µm or less. The double-sided pressure-sensitive adhesive sheet according to any one of claims 1 to 4 , wherein the total light transmittance measured according to JIS K7136 is in the range of 0% to 1%. The pressure-sensitive adhesive layer (B1) has a (meth) acrylate having an alkyl group having 4 to 8 carbon atoms, a vinyl monomer having a carboxyl group, and an alkyl group having 1 to 3 carbon atoms (meth). An acrylic polymer obtained by polymerizing a monomer component containing at least one selected from the group consisting of acrylate and a vinyl monomer having a nitrogen atom, a pigment, and a softening point of 140 ° C to 170 ° C The double-sided pressure-sensitive adhesive sheet according to any one of claims 1 to 5 , which is a pressure-sensitive adhesive layer formed using an aqueous pressure-sensitive adhesive containing a tackifying resin. The double-sided pressure-sensitive adhesive sheet according to any one of claims 1 to 6 , which is used for fixing a decorative member. The double-sided pressure-sensitive adhesive sheet according to any one of claims 1 to 7 , which is used for fixing a punching sheet. An article obtained by fixing a punching sheet to a housing using the double-sided pressure-sensitive adhesive sheet according to claim 8 . The article according to claim 9 , wherein the punching sheet is obtained using polycarbonate.