JP6718142B2 - Article manufacturing method - Google Patents

Description

The present invention relates to a manufacturing method that can be used in the manufacturing scenes of various articles such as electronic devices.

The adhesive sheet is being considered for use in various electronic device manufacturing scenes such as various displays and copiers and multifunctional machines having a copy function, a scan function, and the like.

The adhesive sheet is, for example, a double-sided adhesive tape in which a pressure-sensitive adhesive layer is formed on both sides of a non-woven fabric base material, the interlayer fracture area ratio of the double-sided adhesive tape is 10% or less, and the double-sided adhesive tape is stretched. A double-sided adhesive sheet is known that has a strength of 20 N/10 mm or more in both the MD direction (longitudinal direction) and the TD direction (horizontal direction) (see, for example, Patent Document 1).

On the other hand, in the case where it is required to attach two or more adherends to a strictly specified position without a slight deviation in the manufacturing scene, due to the recent higher functionality and higher precision of the electronic device. There is.

The pasting work is usually performed manually in many cases. When performing the above-mentioned pasting by hand, it is difficult to fix the adherend to a strict position with one pasting work. Has been realized.

However, since the conventional adhesive tape is designed to exhibit extremely excellent adhesive strength in preventing the parts from falling off from the final product, even if the adhesive tape and the adherend are attached to each other. When the load at the time is adjusted to about 15 N/cm ² or more, excellent adhesive strength may already be exhibited when performing the reattachment work, and the reattachment work may not be efficiently performed. It was

On the other hand, when the load is adjusted to less than about 2 N/cm ^{2 in} order to improve the efficiency of the re-adhesion work, the adherend and the adhesive tape are apt to be displaced or peeled off, and they are temporarily fixed at appropriate positions. There were times when you couldn't.

JP, 2001-152111, A

The problem to be solved by the present invention is, when attaching an adhesive sheet to a predetermined position of an adherend, reattachment work can be performed without causing deformation or cracking of the adherend, and after the reattachment. In order to provide a method for producing an article, which is excellent in temporary fixability because it is unlikely to cause a gap between an adherend and an adhesive sheet, and is unlikely to cause peeling over time after main adhesion.

The present inventor has found that the above problem can be solved by applying the adherend and the adhesive sheet with different loads in two stages.

That is, the present invention is a method for producing an article having a structure in which an adhesive sheet is attached to an adherend, wherein the adherend and the adhesive sheet are loaded in a range of ² N/cm ^{2 to} 15 N/cm ^2. in the step of bonding [1], and a method of manufacturing an article, characterized in that it comprises a step [2] for crimping said the adherend and the adhesive sheet under a load of ^25N / cm ^{2 ~80N} / cm 2 It is a thing.

According to the method for producing an article of the present invention, the adherend and the adhesive sheet can be deformed even if the adherend is a thin member that easily causes deformation, cracking, etc. (aluminum plate, glass, etc.). Since it can be re-attached multiple times without causing cracks or cracks, it should be used in applications where two or more adherends are attached to a strictly specified position with no slight misalignment, and adhesively fixed. You can

It is a conceptual diagram which shows the measuring method of surface adhesive strength. It is a conceptual diagram which shows the evaluation method of temporary fixability. It is a conceptual diagram which shows the evaluation method of re-adhesion suitability.

The method for producing an article according to the present invention is a method for producing an article having a structure in which an adhesive sheet is attached to an adherend, wherein the adherend and the adhesive sheet are 2 N/cm ^{2 to} 15 N/cm ² . range step [1] of crimping a load, and, in a manner characterized by comprising the step [2] for crimping said the adherend and the adhesive sheet under a load of ^25N / cm ^{2 ~80N} / cm 2 is there.

In the method for producing the article, the steps [1] and [2] are preferably performed in order, and before the step [1], between the steps [1] and [2], and after the step [2]. In addition to the above steps [1] and [2], another step may be included as necessary.

The step [1] is a step of temporarily fixing the adhesive sheet to the adherend. More specifically, in the step [1], for example, when it is required to attach the adhesive sheet to a strictly specified position of the adherend, the adhesive layer of the adherend and the adhesive sheet is provided. Is a step of contacting with and loading in the range of ² N/cm ^{2 to} 15 N/cm ² . Even if it is difficult to fix the adherend in a strict position with a single sticking operation if the load is within the above range, the adhesive sheet can be stuck without causing adhesive residue or deformation of the adherend. It is possible to perform the repairing work a plurality of times, and to impart a level of temporary fixability that does not cause the adherend and the adhesive sheet to deviate or come off after the rebonding.

Load in the step [1] ^is preferably ^{4N / cm 2 ~12N / cm 2} , it is 4N / cm ² ~10N / cm 2 is workability reapplication and even better temporarily fixed resistance It is more preferable to satisfy both.

The load in the present invention refers to the force applied to the interface between the adherend and the adhesive sheet. More specifically, when the adherend and the adhesive sheet are pressure-bonded to each other by a press, the force applied to the adherend and the adhesive sheet by the press is used. The load due to the weight of the adhesive sheet is usually 0.01 N/cm ² or less, which is extremely small. Therefore, the value not considered when calculating the load in the present invention was set. On the other hand, in the case where two adherends are adhered by an adhesive sheet and they are pressure-bonded by a press machine or the like, usually, one adherend and the adhesive sheet are sufficiently adhered in advance to form a laminate. Is manufactured, placed on the surface of the other adherend, and pressed by, for example, a pressing machine. In this case, the load refers to the total of the force applied to them by the pressing machine and the force derived from the mass of the adherends constituting the laminate. Even in this case, the load due to the weight of the adhesive sheet is usually 0.01 N/cm ² or less, which is extremely small. Therefore, the value used in the calculation of the load in the present invention is not considered.

The step [1] can be carried out in an arbitrary temperature environment, but it is not necessary to carry out heating or the like like a conventional thermoplastic adhesive sheet, and it is preferably carried out within an assumed working environment temperature range. In particular, it is preferably carried out in the range of -5°C to 40°C, more preferably in the range of 0°C to 35°C.

In the step [1], the time for pressure-bonding the adherend and the adhesive sheet with the load in the above range may be arbitrarily set in the working step, but the load should be 1 second or more for temporarily fixing the article. Is preferred. On the other hand, in order to improve the production efficiency of the article, it is preferable that the loading time is not too long. Therefore, the pressure bonding time is preferably 1 second to 30 seconds, and more preferably 3 seconds to 25 seconds. More preferably, it is 5 seconds to 20 seconds.

In the step [1], examples of a method for pressing the adherend and the adhesive sheet with a load within the above range include a method using a commercially available press, finger pressure, a pressure roller, and a weight having a predetermined load. Here, when a relatively thin rigid body (thin glass or the like) is used as the adherend, it is preferable to use the pressing machine. On the other hand, when the adhesive sheet is attached to the curved surface of the adherend, it is preferable to adopt a method of pressing with a finger.

Next, the step [2] will be described.

The above-mentioned step [2] is a step of firmly adhering (adherently fixing) the adherend and the adhesive sheet so as not to cause peeling over time. Step More specifically, the step [2], which load, for example, the after the adhesive sheet is closely identified location of the adherend temporarily fixed, the range of 25N ^/ cm ² ~80N / cm 2 Is. When the load is within the above range, the adherend and the adhesive sheet can be firmly adhered to each other, and as a result, peeling over time can be effectively prevented, and the adherend is subjected to the load. It is possible to effectively prevent deformation and damage of the.

Load in the step [2] ^is preferably in the range of ^{25N / cm 2 ~70N / cm 2} , more preferably in the range of ^{25N / cm 2 ~60N / cm 2} , 25N / cm 2 ~55N When it is in the range of /cm ² , the adherend and the adhesive sheet can be firmly bonded to each other, and as a result, peeling over time can be effectively prevented, and when the load is applied, It is more preferable because deformation and damage of the body can be effectively prevented.

The step [2] can be performed in an arbitrary temperature environment, but it is not necessary to perform heating and the like like a conventional thermoplastic adhesive sheet, and it is preferable to perform it in an assumed working environment temperature range. In particular, it is preferably carried out in the range of -5°C to 40°C, more preferably in the range of 0°C to 35°C.

In the step [2], the time for press-bonding the adherend and the adhesive sheet with the load in the above range may be arbitrarily set in the working step, but the load should be 1 second or more for temporarily fixing the article. Is preferred. On the other hand, in order to improve the production efficiency of the article, it is preferable that the loading time is not too long. Therefore, the pressure bonding time is preferably 1 second to 30 seconds, and more preferably 3 seconds to 25 seconds. More preferably, it is 5 seconds to 20 seconds.

In the step [2], as a method of pressing the adherend and the adhesive sheet with a load within the above range, a commercially available press, finger pressure, a pressure roller, or a weight of a predetermined load is applied to the upper portion of the adhesive sheet or the adherend. There is a method of mounting on. Here, when a relatively thin rigid body (thin glass or the like) is used as the adherend, it is preferable to use the pressing machine. On the other hand, when the adhesive sheet is attached to the curved surface of the adherend, it is preferable to adopt a method of pressing with a finger.

Next, the adhesive sheet used in the method for producing an article of the present invention will be described.

As the adhesive sheet used in the present invention, a so-called substrateless adhesive sheet composed of a single-layer adhesive layer, an adhesive sheet having the adhesive layer on one side or both sides of the support, directly or via another layer Can be used. As the above-mentioned adhesive sheet, it is preferable to use an adhesive sheet having the above-mentioned adhesive layer on both surfaces of the support, either directly or through another layer.

As the adhesive layer, it is preferable that the storage elastic modulus _{G 23} at frequency 1Hz and 23 ° C. to use what is in a range of ^{1.0 × 10 4 Pa~5.0 × 10 6} Pa, 7.0 × 10 it is more preferable to use those in the range of ^{4 Pa~3.0} × ¹⁰ 6 Pa, more preferably be used those in the range of ^{1.0 × 10 5 Pa~3.0 × 10 6} Pa , 5.0×10 ⁵ Pa to 2.5×10 ⁶ Pa is more preferable, and 1.0×10 ⁵ Pa to 2.3×10 ⁶ Pa is preferable. By using the adhesive sheet, the adhesive sheet and the adherend can be reattached relatively easily when the step [1] is performed, but peeling or displacement from the adherend is less likely to occur (temporary). It can be fixed), and by performing the step [2], the adhesiveness between the surface of the adhesive layer and the adherend can be further improved, and very excellent adhesive strength can be exhibited, which is particularly preferable.

Further, as the adhesive layer, the center line average surface roughness Ra of the surface in contact with the adherend is preferably 0.3 μm to 3.0 μm, more preferably 0.5 μm to 2.8 μm, The range of 0.7 μm to 2.5 μm is more preferable, the range of 1.0 μm to 2.3 μm is more preferable, and the range of 1.5 μm to 2.2 μm is preferable. ], the adhesive sheet and the adherend can be reattached relatively easily, but peeling or displacement from the adherend is less likely (temporary fixing), and the step [2] By performing the above, the adhesion between the surface of the adhesive layer and the adherend can be further improved, and extremely excellent adhesive strength can be exhibited, which is particularly preferable.

The center line surface average roughness Ra of the adhesive layer is "color 3D laser microscope VK-9500" (manufactured by KEYENCE) for arbitrary three points (each 50 μm×50 μm square area) on the surface of the adhesive layer. Surface magnification was measured three times using a lens magnification of 50 times, measurement mode: super depth, pitch: 0.05 μm, optical zoom: 1.0 times, and the average value of the center line average surface roughness measured was the above adhesion. The center line average surface roughness Ra of the surface in contact with the layer adherend was used.

As described above, the adhesive sheet having the predetermined storage elastic modulus G ₂₃ at 23° C. and the centerline average surface roughness Ra has a surface of an adherend after the light load step of the step [1] is obtained. Since it is possible to maintain the state where the convex portion of the uneven shape of the adhesive layer and the convex portion of the adhesive layer are adhered, it is possible to efficiently re-attach the above-mentioned adhesive sheet, and the adhesive force of the adhesive portion can be applied from the adherend. Less likely to cause peeling or misalignment.

On the other hand, in the case of the above-mentioned adhesive sheet, after the heavy load step of the step [2], the uneven shape of the adhesive layer is deformed and the entire surface is adhered to the adherend, resulting in a very excellent adhesive force. Can be expressed.

As the adhesive layer, for example, an adhesive layer having a so-called pressure-sensitive adhesive property (adhesiveness) at room temperature (about 25° C. or less) can be used.

The adhesive layer includes a resin having so-called pressure-sensitive adhesiveness (adhesiveness) even at room temperature (approximately 25° C. or lower), an adhesive component of a tackifying resin that can be used as necessary, and, if necessary, It is preferable to use those containing other additives that can be used as described above.

Examples of the adhesive component constituting the adhesive layer include natural rubber polymers, synthetic rubber polymers, acrylic polymers, silicone polymers, urethane polymers, vinyl ether polymers and the like.

Above all, it is preferable to use a synthetic rubber polymer or an acrylic polymer as the adhesive component.

As the synthetic rubber polymer, it is preferable to use a styrene block copolymer. The styrene-based block copolymer refers to a triblock copolymer having a polystyrene unit (a1) and a polyolefin unit (a2), a diblock copolymer, or a mixture thereof.

Examples of the styrene block copolymer include polystyrene-poly(isopropylene) block copolymer, polystyrene-poly(isopropylene) block-polystyrene copolymer, polystyrene-poly(butadiene) block copolymer, polystyrene. -Poly(butadiene) block-polystyrene copolymer, polystyrene-poly(butadiene/butylene) block copolymer, polystyrene-poly(butadiene/butylene) block-polystyrene copolymer, polystyrene-poly(ethylene/propylene) block copolymer Polymer, polystyrene-poly(ethylene/propylene) block-polystyrene copolymer, polystyrene-poly(ethylene/butylene) block copolymer, polystyrene-poly(ethylene/butylene) block-polystyrene copolymer, polystyrene-poly( An ethylene-ethylene/propylene) block copolymer, a polystyrene-poly(ethylene-ethylene/propylene) block-polystyrene copolymer, etc. can be used. Among them, it is preferable to use a block copolymer having a polystyrene unit (a1) and a polyisoprene unit (a2) as the styrene-based block copolymer, and a polystyrene-poly(isopropylene) block copolymer is used. It is more preferable to use a combination, a polystyrene-poly(butadiene) block copolymer, or a polystyrene-poly(butadiene) block-polystyrene copolymer.

A polymer of an acrylic monomer may be used as the acrylic polymer. As the acrylic monomer, (meth)acrylic acid, alkyl (meth)acrylate such as 2-ethylhexyl (meth)acrylate, n-butyl (meth)acrylate, or the like can be used.

The tackifying resin, for the purpose of adjusting the strong adhesion of the adhesive layer, for example, rosin-based tackifying resin, polymerized rosin-based tackifying resin, polymerized rosin ester-based tackifying resin, rosin phenol-based tackifying resin , Stabilized rosin ester-based tackifying resin, disproportionated rosin ester-based tackifying resin, terpene-based tackifying resin, terpene phenol-based tackifying resin, petroleum resin-based tackifying resin, and the like.

Among the above-mentioned tackifier resins, it is preferable to use a terpene phenol-based tackifier resin. As the terpene phenol-based tackifying resin, among the conventionally known copolymers of terpene monomer and phenol, those having a softening point of 100° C. to 125° C. can be selected and used. It is preferable in that the compatibility with the above is improved and, as a result, excellent adhesiveness is imparted.

The terpene phenol-based tackifying resin is preferably used in the range of 30 parts by mass to 120 parts by mass with respect to 100 parts by mass of the synthetic rubber-based polymer or acrylic polymer as the adhesive component, and 40 parts by mass. It is more preferable to use it in the range of 100 parts by mass to 100 parts by mass in order to impart more excellent adhesiveness.

As the above-mentioned adhesive component, in addition to the above-mentioned adhesive component, those containing a cross-linking agent, other additives, and the like, if necessary, can be used.

As the cross-linking agent, for the purpose of improving the cohesive force of the adhesive layer, known isocyanate-based cross-linking agents, epoxy-based cross-linking agents, aziridine-based cross-linking agents, polyvalent metal salt-based cross-linking agents, metal chelate-based cross-linking agents, A keto-hydrazide type crosslinking agent, an oxazoline type crosslinking agent, a carbodiimide type crosslinking agent, a silane type crosslinking agent, a glycidyl (alkoxy)epoxysilane type crosslinking agent, etc. can be used.

As the adhesive layer, in addition to the above-mentioned components, if necessary, a foaming agent, a heat-expandable balloon, an antioxidant, a plasticizer, a filler, a pigment, an ultraviolet absorber, an ultraviolet stabilizer, a flameproofing agent, a difficult agent. A flame retardant or the like can be used within a range that does not impair the effects of the present invention.

Examples of the support include polyester resins such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyamide resins such as polycarbonate, polyarylate, polyurethane, polyamide and polyetheramide, polyimide, polyetherimide, polyamideimide. Polyimide resin such as, polysulfone, polysulfone such as polyethersulfone, polyetherketone, polyetherketone such as polyetheretherketone, organic resin film such as polyphenylene sulfide, modified polyphenylene oxide, cellulose fiber, polyester Fibers, aramid fibers, organic fibers such as liquid crystal polymer fibers or glass fibers, metal fibers, woven or non-woven substrates containing inorganic fibers such as carbon fibers, glass plates, films, sheets or plates of inorganic materials such as metal foils, And a laminate of these.

Further, as the support, a composite of glass fiber reinforced plastic (GFRP) or the like can be used.

Examples of the support include, as a base material, a woven or non-woven base material containing glass fibers, a glass fiber composite, a glass base material including a glass plate, a polyamide resin film, or a polyimide base material. A resin film can be used.

As the support, it is preferable to use a support having a corona treatment on its surface or a support provided with a primer layer because the adhesion between the support and the adhesive layer can be improved.

A support having a communication port can be used as the support. As the support having a communication port, various conventionally known supports described above can be used, and examples thereof include paper, nonwoven fabric, a porous film including the plastic film, a metal mesh, a punching film, and the like. Can be used. The communication port means one or a plurality of spatially continuous openings that connect the first surface and the second surface of the support.

As the support, it is preferable to use a support having a thickness of 1 μm to 200 μm, and more preferably a support having a thickness of 12 μm to 50 μm.

As the adhesive sheet, it is preferable to use one having a thickness of the adhesive layer provided on one side of the support of 25 μm or more, more preferably 50 μm to 120 μm, for example. It is more preferable to use a resin having a thickness of 60 μm to 120 μm in order to obtain an adhesive sheet which has excellent cohesive force and exhibits excellent adhesive strength when pressed under a predetermined load.

As the adhesive sheet, for example, it is preferable to use a sheet in which the total thickness of the adhesive layers provided on both sides of the support is 50 μm or more, and more preferably 50 μm to 300 μm. The range of 100 μm to 250 μm is more preferable, and the range of 100 μm to 210 μm is more preferable in order to obtain an adhesive sheet having excellent cohesive force and exhibiting excellent adhesive strength when pressed with a predetermined load. preferable.
Is more preferable.

The adhesive sheet, in advance, on the surface of the release liner, using a roll coater or the like, to apply a coating liquid (adhesive) containing the adhesive component, to form an adhesive layer by drying, then, The pressure-sensitive adhesive layer can be manufactured by a transfer method in which one side or both sides of the support is attached.

The form of the coating liquid (adhesive) includes solvent-based, emulsion-based adhesives, water-based adhesives such as water-soluble adhesives, hot-melt adhesives, UV-curable adhesives, solvent-free EB-curable adhesives and the like. A system etc. are mentioned.

As a method of imparting a predetermined center line average surface roughness Ra to the surface of the adhesive layer that contacts the adherend, the center line average surface roughness of the release treated surface of the release liner is preferably 0. 3 μm to 3.0 μm, more preferably 0.5 μm to 2.8 μm, more preferably 0.7 μm to 2.5 μm, more preferably 1.0 μm to 2.3 μm, still more preferably 1.5 μm to 2.2 μm. A method using a release liner having a range is included. Specifically, the release-treated surface of the release liner having a center average surface roughness in the above range is coated with the coating liquid (adhesive) and dried to form an adhesive layer, which is A method of attaching the release liner to the surface of the support and removing the release liner, if necessary.

By the above method, the center line surface roughness that is the same as, about the same as, or slightly larger than the center average surface roughness of the release treated surface is transferred to the surface of the adhesive layer.

Examples of the release liner include, for example, polyethylene terephthalate, polyethylene, polypropylene, resin films such as ethylene-propylene copolymer, foamed film, Japanese paper, western paper, paper such as glassine paper, non-woven fabric, metal foil, and combinations thereof. Among the laminated films, those having a release-treated surface having a center line average surface roughness within the above range can be used.

The shape of the release treated surface of the release liner can be imparted by sandblasting the surface of the film. As the shape of the release treated surface of the release liner, a film or the like obtained by molding a mixture of the resin and the mat material into a film can be used.

Further, the method for producing an article of the present invention includes a method for producing an article having a constitution in which two or more adherends are adhered with an adhesive sheet, and specifically, one of the adherends is provided with an adhesive sheet. sticking to the step of producing a laminate was pressed at 2N / cm ² or more loads, and the adhesive sheet side surface of the laminate, the other the ^adherend, a range of 2N / cm ² ~15N / cm 2 the step of crimping a load [3], and, the article characterized by having a step [4] for crimping and the laminate and the other adherend at a load of ^25N / cm ^{2 ~80N} / cm 2 A manufacturing method can be mentioned.

In the step of producing a laminated body by pressure-bonding one adherend and the adhesive sheet, it is preferable to pressure-bond them with a load of ² N/cm ² or more, and pressure-bond in the range of ² N/cm ^{2 to} 80 N/cm ^2. It is preferable.

The step [3] and the step [4] of pressure-bonding the laminated body and the other adherend can be performed in the same manner as the steps [1] and [2] described above, respectively. In the step [4], the laminated body may be placed and pressure bonded on the surface (upper side) of the other adherend, and the laminated body is placed so that the surface on the adhesive sheet side is the upper side. The other adherend may be placed on the surface and pressure-bonded, but a method of placing the laminate on the surface (upper side) of the other adherend and pressure-bonding is preferable.

In the method for producing an article of the present invention, when the step [1] is performed, the re-adhesion work can be efficiently performed, while when the step [2] is performed, very excellent adhesion is achieved. Since it exhibits strength, it can be suitably used for re-adhesion and adhesion fixing of a member whose adherend is thin and which easily causes deformation and cracks.

Examples of the adherend include glass, metals such as aluminum, plastics made of resin such as acryl and polycarbonate, and the like.

Examples of the article obtained by the production method of the present invention include an in-vehicle display in which a polycarbonate decorative panel is joined to an image display device.

The present invention will be specifically described below with reference to examples.

(Preparation Example 1) Adhesive (a-1)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (a mixture of a triblock copolymer and a diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass ratio of polystyrene units to the entire styrene-butadiene block copolymer is 30 mass %, the mass ratio of polybutadiene units is 70 mass %, 100 mass parts, terpene phenolic tackifying resin (softening point 115° C., number average molecular weight). 1000) 65 parts by mass of the mixture was dissolved in 200 parts by mass of toluene to obtain an adhesive (a-1).

(Preparation Example 2) Adhesive (a-2)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (a mixture of a triblock copolymer and a diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass ratio of polystyrene units to the entire styrene-butadiene block copolymer is 30 mass %, the mass ratio of polybutadiene units is 70 mass %, 100 mass parts, terpene phenolic tackifying resin (softening point 115° C., number average molecular weight). A mixture of 80 parts by mass of 1000) was dissolved in 200 parts by mass of toluene to obtain an adhesive (a-2).

(Preparation Example 3) Adhesive (a-3)
Styrene-butadiene block copolymer X having a weight average molecular weight of 300,000 (a mixture of a triblock copolymer and a diblock copolymer. The ratio of the diblock copolymer to the total amount of the mixture is 50% by mass. The mass ratio of polystyrene units to the entire styrene-butadiene block copolymer is 30 mass %, the mass ratio of polybutadiene units is 70 mass %, 100 mass parts, terpene phenol-based tackifying resin (softening point 115° C., number average molecular weight). 1000) 50 parts by mass of the mixture was dissolved in 200 parts by mass of toluene to obtain an adhesive (a-3).

<Preparation of adhesive tape>
(Production Example 1)
The adhesive (a-1) was applied to the surface of a release liner having a centerline average surface roughness Ra of 1.63 μm using an applicator so that the thickness after drying was 88 μm, and the temperature was 85° C. An adhesive layer was formed by drying for 5 minutes. The adhesive layer was adhered to both sides of a polyethylene terephthalate film having a thickness of 25 μm and then laminated under pressure of 40 N/cm ² to obtain an adhesive sheet 1.

(Production Example 2)
The adhesive (a-2) was applied to the surface of a release liner having a center line average surface roughness Ra of 1.63 μm using an applicator so that the thickness after drying was 88 μm, and the temperature was 85° C. An adhesive layer was formed by drying for 5 minutes. The adhesive layer was bonded to a polyethylene terephthalate film surfaces of thickness 25 [mu] m, by pressurizing the laminate at 40N / cm ^2, to obtain an adhesive sheet 2.

(Production Example 3)
The adhesive (a-3) was applied to the surface of a release liner having a centerline average surface roughness Ra of 1.63 μm using an applicator so that the thickness after drying was 88 μm, and the temperature was 85° C. An adhesive layer was formed by drying for 5 minutes. The adhesive layer was adhered to both sides of a polyethylene terephthalate film having a thickness of 25 μm, and then pressure-adhered at 40 N/cm ² to laminate the adhesive sheet 3.

(Production Example 4)
The adhesive (a-1) was applied to the surface of a release liner having a centerline average surface roughness Ra of 0.55 μm using an applicator so that the thickness after drying was 88 μm, and the temperature was 85° C. An adhesive layer was formed by drying for 5 minutes. The adhesive layer was adhered to both sides of a polyethylene terephthalate film having a thickness of 25 μm, and then pressure-adhesive at 40 N/cm ² to laminate the adhesive sheet 4.

[Production of goods]
(Example 1)
In an environment of 23° C., the adhesive sheet 1 was cut into a frame shape having a width of 2 mm and a square having one side (outer shape) of 14 mm in length.

The release liner on one side of the cut adhesive sheet was peeled off, and a rectangular parallelepiped transparent acrylic plate having a length of 15 mm, a width of 15 mm and a thickness of 5 mm and a weight of 1.3 g and the adhesive sheet were used to press 50 N/ After applying a load of cm ² for 10 seconds and sticking, the pressed state was released. At that time, one side of the cut adhesive sheet was made to correspond to 15 mm of one side of the transparent acrylic plate, and then the other release liner was peeled off.

Next, under an environment of 23° C., a stainless plate (SUS304) having a length of 30 mm, a width of 65 mm, and a thickness of 5 mm having a hole of 10 mm in the center and a weight of 90 g, and an acrylic plate to which the adhesive sheet was attached The surface on the adhesive sheet side is overlapped so that their centers coincide with each other, and they are applied by a pressing machine for 10 seconds with a force such that the load applied to the adhesive sheet is 5 N/cm ² (compression bonding step [3 ]).

After releasing the loaded state, they were loaded with a pressing machine for 10 seconds with a force such that the load applied to the adhesive sheet was 50 N/cm ² (compression bonding step [4]). Then, an article was obtained by releasing the loaded state.

(Example 2)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 2 was used instead of the adhesive sheet 1.

(Example 3)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 3 was used instead of the adhesive sheet 1.

(Example 4)
An article was obtained in the same manner as in Example 1 except that the adhesive sheet 4 was used instead of the adhesive sheet 1.

(Comparative Example 1)
Except that a 0.5 N / cm ² instead of the load in the compression process [3] to 5N / cm ² was prepared an article in the same manner as in Example 1.

(Comparative example 2)
An article was produced in the same manner as in Example 1 except that the load in the pressure bonding step [3] was changed to 5 N/cm ² and 30 N/cm ² .

(Comparative example 3)
An article was produced in the same manner as in Example 1 except that the load in the pressure bonding step [4] was changed to 50 N/cm ² and 15 N/cm ² .

[Method of measuring center line average surface roughness Ra of the surface of the adhesive layer in contact with the adherend]
The release liner laminated on the adhesive layer constituting the adhesive sheet obtained in Preparation Example was peeled off, and the center line average surface roughness Ra of the adhesive layer in contact with the adherend was measured by the following method.

"Color 3D laser microscope VK-9500" manufactured by KEYENCE (lens magnification 50 times, measurement mode: ultra-depth, pitch: 0. 0.) was applied to arbitrary 3 points (each 50 μm x 50 μm square area) on the surface of the adhesive layer. The surface was measured using an optical zoom (05 μm, 1.0×), and the center line average surface roughness Ra thereof was measured. The average value of the center line average surface roughness Ra of the three points obtained in the above measurement was defined as the center line average surface roughness Ra of the surface of the adhesive layer in contact with the adherend.

[Measurement of dynamic viscoelasticity of adhesive layer]
The adhesive used in the production of the adhesive sheet obtained in Production Example was applied to the surface of the release liner using an applicator so that the thickness after drying was 100 μm, and dried at 85° C. for 5 minutes. A plurality of adhesive layers each having a thickness of 100 μm were formed.

By stacking the adhesive layers obtained above, a test piece composed of an adhesive layer having a thickness of 2 mm was prepared.

A parallel plate having a diameter of 7.9 mm was attached to a viscoelasticity tester (Ares 2kSTD) manufactured by TA Instruments Japan. The test piece was sandwiched between the parallel plates with a compression load of 40 to 60 g, and the storage elastic modulus at 23° C. was measured under the conditions of a frequency of 1 Hz, a temperature range of −60 to 150° C., and a temperature rising rate of 2° C./min. It was measured.

[Surface adhesion strength after pressure bonding step [3]]
The article after performing the crimping step [3] described in Examples and Comparative Examples was placed in a tensile tester equipped with a stainless steel probe having a diameter of 8 mm (Tensilon RTA-100 manufactured by A&D Corp., compression mode). Set When the probe applies a force to the acrylic plate forming the article through the hole of the stainless plate (SUS304) forming the article, the strength (N /Cm ² ) was measured at 23° C. (see FIG. 1). The speed at which the probe pressed the acrylic plate was set to 10 mm/min.

[Temporary fixability after crimping step [3]]
The article after performing the crimping step [3] described in Examples and Comparative Examples was placed on a flat surface with the stainless steel plate facing downward, and the acrylic plate was pinched with the thumb and middle fingers to vertically move the product. Lifted and held in air for 10 seconds. It was visually confirmed whether or not the acrylic plate had fallen off from the stainless plate during the 10 seconds (see FIG. 2).

The temporary fixability test was performed 10 times and evaluated according to the following criteria.

◯: The stainless steel plate did not drop during the 10th test.

B: The stainless steel plate dropped once or twice in 10 tests.

Δ: The stainless steel plate dropped 3 to 5 times during 10 tests.

X: The stainless steel plate dropped 6 to 10 times in 10 tests.

[Re-adhesion suitability after crimping step [3]]
The article after the crimping step [3] described in Examples and Comparative Examples was placed on a flat base with the stainless steel plate facing down, the acrylic plate was pinched with the thumb and middle finger, and the stainless steel plate was held with the other hand. It was confirmed whether or not the acrylic plate could be peeled off from the stainless plate when the acrylic plate was pulled vertically while being pressed at a speed of about 30 m/min.

The re-adhesion suitability test was performed 10 times and evaluated according to the following criteria.

◯: The acrylic plate could be peeled off during the 10th test.

B: The acrylic plate could be peeled off 8 to 9 times in 10 tests.

Δ: The acrylic plate could be peeled off 3 to 7 times in 10 tests.

X: The acrylic plate could be peeled off less than twice in 10 tests.

[Surface adhesion strength after pressure bonding step [2]]
The article after the crimping step [4] described in Examples and Comparative Examples was set in a tensile tester (Tensilon RTA-100 manufactured by A&D Co., compression mode) equipped with a probe made of stainless steel having a diameter of 8 mm. When the probe applies a force to the acrylic plate forming the article through the hole of the stainless plate (SUS304) forming the article, the strength (N /Cm ² ) was measured at 23°C. The speed at which the probe pressed the acrylic plate was set to 10 mm/min.

1 Transparent acrylic plate 2 Cut adhesive sheet 3 Stainless steel plate (SUS304)
4 probe 5 plane stand

Claims (5)

A method of manufacturing an article having a structure in which an adhesive sheet is attached to an adherend, the step of pressure-bonding the adherend and the adhesive sheet with a load in the range of ² N/cm ^{2 to} 15 N/cm ^2. ], and manufacture of articles comprising a step [2] for crimping said the adherend and the adhesive sheet under a load of ^25N / cm ^{2 ~80N} / cm 2 after passing through the step [1] Method. The pressure bonding method in the step [1] is a pressure bonding method for 1 second to 30 seconds in a temperature environment of −5° C. to 40° C., and the pressure bonding method in the step [2] is a temperature of −5° C. to 40° C. The method for producing an article according to claim 1 , which is a method of pressure bonding for 1 second to 30 seconds in an environment. The adhesive sheet be one having an adhesive layer, the center line average surface roughness Ra of the surface in contact with the adherend of the adhesive layer to claim 1 or 2 in the range of 0.2μm~5.0μm A method of manufacturing the described article. The method for producing an article according to claim 3 , wherein the storage elastic modulus at 23° C. of the adhesive layer is in the range of 1×10 ⁴ Pa to 5×10 ⁶ Pa. A method for producing an article having a structure in which two or more adherends are adhered by an adhesive sheet, wherein an adhesive sheet is attached to one adherend and pressure-bonded with a load of ² N/cm ² or more to produce a laminate. [3], the step of pressing the surface of the laminate on the adhesive sheet side and the other adherend with a load in the range of ² N/cm ^{2 to} 15 N/cm ² , and [3] the method of manufacturing an article, characterized in that the laminate and said other adherend has a step [4] of crimping a load of ^25N / cm ^{2 ~80N} / cm 2 after.

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