JP7122086B2 - adhesive film - Google Patents

Description

The present invention relates to adhesive films.

In recent years, the number of articles imparted with antibacterial properties has been increasing, and films imparted with antibacterial properties are also known (see, for example, Patent Document 1).

However, even if the film has antibacterial properties, when it is used with printing (for example, when used as a label), even if the film itself has antibacterial properties, the printed part (printed layer) has a problem that the antibacterial property is not exhibited.

JP-A-8-216348

An object of the present invention is to make the printed layer excellent in visibility when attached to a member having a base material and a printed layer, and to suitably impart antibacterial properties to the printed member. To provide an adhesive film capable of

Such objects are achieved by the present invention described in (1) to (3) below.
(1) An adhesive that is adhered to a member having a substrate and a printed layer so as to cover the printed layer and has a haze of 2.0% or less as a value measured according to JIS K7136:2000. a film,
a film substrate;
A pressure-sensitive adhesive layer provided on one side of the film substrate and made of a material containing a pressure-sensitive adhesive;
An antibacterial layer provided on the other surface side of the film substrate and made of a material containing an antibacterial agent,
The film substrate is made of a material containing at least one of polyester and polyolefin , and has a thickness of 15 μm or more and 75 μm or less. has been processed,
The antibacterial layer contains a polyester and a cross-linking agent, has a thickness of 0.1 μm or more and 5 μm or less, and has a content of the antibacterial agent of 1% by mass or more and 20% by mass or less,
The pressure-sensitive adhesive film, wherein the antibacterial agent is granular and has an average particle diameter of 100 nm or more and 4000 nm or less.

(2) The adhesive film according to (1) above, wherein the antibacterial layer contains the antibacterial agent carrying Ag ions.
(3) The adhesive film according to (1) or (2) above, wherein the surface treatment is for enhancing adhesion between the film substrate and the antibacterial layer.

According to the present invention, when attached to a member having a substrate and a printed layer, the visibility of the printed layer is excellent, and antibacterial properties are preferably imparted to the printed member. It is possible to provide an adhesive film that can be

BRIEF DESCRIPTION OF THE DRAWINGS It is a typical longitudinal cross-sectional view which shows suitable embodiment of the adhesion film of this invention. FIG. 2 is a schematic longitudinal sectional view showing a state in which the pressure-sensitive adhesive film shown in FIG. 1 is adhered to a member (adherend). 1 is a schematic longitudinal sectional view showing a preferred embodiment of an adhered article to which the adhesive film of the present invention is adhered; FIG.

Preferred embodiments of the present invention are described in detail below.
[Adhesive film]
First, the adhesive film of the present invention will be explained.

FIG. 1 is a schematic longitudinal sectional view showing a preferred embodiment of the adhesive film of the invention. FIG. 2 is a schematic longitudinal sectional view showing a state in which the adhesive film shown in FIG. 1 is adhered to a member (adherend).

As shown in FIG. 1, the adhesive film 10 has an adhesive layer 2 made of a material containing an adhesive and an antibacterial layer 3 made of a material containing an antibacterial agent. Then, the adhesive film 10 is attached to a member (adherend) 50 having a substrate 51 and a printed layer (printed portion) 52 so as to cover the printed layer 52 (see FIG. 2).

With such a configuration, it is possible to suitably impart antibacterial properties to the member (adherend) 50 on which printing has been performed.

More specifically, for example, even if the member 50 is made of a material that does not contain an antibacterial component, the member 50 can be imparted with antibacterial properties. In particular, the user or the like can determine whether or not to impart antibacterial properties to the member 50, which was not originally intended to be imparted with antibacterial properties, and subsequently select to impart antibacterial properties.

Further, even if the main body (base material 51) of the member 50 is made of a material having antibacterial properties, the printed layer 52 generally does not have antibacterial properties. Also, the member 50 including the printed layer 52 can preferably be provided with antibacterial properties.

It is also conceivable to form the printing layer 52 using a special ink containing an antibacterial agent, but in such a case, the printability is adversely affected and the adhesion of the printing layer 52 to the base material 51 is lowered. However, by using the adhesive film 10, the member 50 can be provided with antibacterial properties while preventing the occurrence of such problems.

In addition, when the member 50 is made of a material containing an antibacterial material and the member 50 itself has antibacterial properties, the antibacterial properties deteriorate (for example, deterioration of the antibacterial component, separation from the member 50, etc.) (Decrease in antibacterial property due to deterioration of antibacterial property) Then, if it is desired to continuously obtain antibacterial property, it is necessary to replace the member 50 itself even if there is no problem with other performance of the member 50, but the adhesive film 10 is used. In this case, the antibacterial property can be continuously obtained only by exchanging (re-pasting) the adhesive film adhered to the member 50 . As a result, as a whole, the antibacterial property can be preferably imparted for a longer period of time, and it is also preferable from the viewpoint of cost reduction, resource saving, and the like.
In this specification, the term "film" includes the concept of a sheet.

(Film substrate)
The adhesive film 10 of this embodiment has an adhesive layer (film adhesive layer) 2 and an antibacterial layer 3, and a film substrate (substrate) 1 having a function of supporting them.

As a result, the adhesive film 10 can be given an appropriate stiffness, and the ease of handling of the adhesive film 10 (for example, the occurrence of wrinkles when sticking to the member 50, adhesion to undesired parts, etc. (difficulty to remove, etc.) is improved.

Then, it has an adhesive layer 2 on the first surface 11 side, which is one surface of the film substrate 1, and the other surface of the film substrate 1 (the surface opposite to the first surface 11). 2 has an antibacterial layer 3 on the surface 12 side.

As a result, the antibacterial properties can be more effectively exhibited in a state of being adhered to the member 50 .

The film substrate (substrate) 1 may be made of any material, and examples of the constituent material of the film substrate 1 include polyethylene, polypropylene, ethylene/propylene copolymer, and ethylene/vinyl acetate copolymer. , ethylene/methyl acrylate copolymer, ethylene/ethyl acrylate copolymer, ethylene/butyl acrylate copolymer, ethylene/methacrylic acid copolymer, ethylene/methyl methacrylate copolymer, etc.; Resin; vinyl acetate resin; polyester such as polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate; acetate resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, polystyrene, polyvinyl chloride, polyamide, polyesteramide, poly Ether, polyimide, polyamideimide, poly-p-phenylene sulfide, polyether ester, etc., may be mentioned, and one or more selected from these may be used in combination. It is preferably made of a material containing at least one of polyolefins.

As a result, the adhesive film 10 can be given more suitable stiffness, and the ease of handling of the adhesive film 10 (for example, the occurrence of wrinkles when sticking to the member 50, adhesion to undesired parts, etc. difficult to remove) can be further improved. In addition, since these materials generally have excellent light transmittance, the visibility of the printed layer 52 can be improved when the adhesive film 10 is adhered to the member 50 . In addition, since the film substrate 1 made of the above materials generally has excellent adhesion to the adhesive layer 2 and the antibacterial layer 3 made of the material described later, the durability of the adhesive film 10 is improved. etc. can be improved, and unintentional destruction of the adhesive film 10 when peeling the adhesive film 10 from the member 50 can be effectively prevented.

Moreover, the film substrate 1 may contain components other than the materials described above. Examples of such components include coloring agents such as dyes and pigments, antioxidants such as anilides and phenols, ultraviolet absorbers such as benzophenones and benzotriazoles, light stabilizers, modifiers, and rust preventives. agents, fillers, surface lubricants, corrosion inhibitors, heat stabilizers, lubricants, antistatic agents, polymerization inhibitors, cross-linking agents, catalysts, plasticizers, leveling agents, thickeners, softeners, dispersants, antibacterial agents etc.

When the film substrate 1 contains an antibacterial agent, the antibacterial agent may be, for example, a component described later as a constituent component of the antibacterial layer 3 . In addition, when the film substrate 1 contains an antibacterial agent, the antibacterial agent contained in the film substrate 1 and the antibacterial agent contained in the antibacterial layer 3 may satisfy the same conditions, or may meet different conditions. There may be.

Moreover, the film substrate 1 may be composed of a single layer, or may be a laminate having a plurality of layers. Further, the film substrate 1 may be made of, for example, a gradient material whose composition changes gradiently in the thickness direction.

Moreover, the film substrate 1 may be subjected to a surface treatment for enhancing adhesion with the pressure-sensitive adhesive layer 2 and the antibacterial layer 3 .

As a result, for example, the adhesion between the film substrate 1 and the adhesive layer 2 can be particularly increased relative to the adhesion between the adhesive layer 2 and the adherend 50, and the adhesive film 10 can be adhered. The occurrence of adhesive residue when peeling from the body 50, interfacial peeling between the film base 1 and the adhesive layer 2, unintentional peeling between the film base 1 and the antibacterial layer 3, etc. can be effectively prevented.

Examples of such surface treatment include a method of applying an easily adhesive resin such as a polyester, acrylic, or polyurethane resin, and corona treatment.

The thickness of the film substrate 1 is preferably 15 μm or more and 300 μm or less, more preferably 20 μm or more and 250 μm or less, and even more preferably 25 μm or more and 75 μm or less.

As a result, it is possible to further improve the conformability to the shape of the surface of the member 50 while sufficiently exhibiting the effect of providing the film substrate 1 as described above. Excellent adhesion can be ensured even if the portion where the adhesive is adhered has a curved surface with a small radius of curvature. Moreover, the transparency of the base material 1 can be particularly improved, and the visibility of the printed layer 52 through the adhesive film 10 can be improved.

(Adhesive layer)
The pressure-sensitive adhesive layer 2 is made of a material containing a pressure-sensitive adhesive, adheres closely to the adherend 50 , and has the function of fixing the pressure-sensitive adhesive film 10 to the adherend 50 .

Examples of adhesives constituting the adhesive layer 2 include acrylic adhesives, synthetic rubber adhesives, urethane adhesives, and silicone adhesives.

Acrylic pressure-sensitive adhesives may contain acrylic monomers as constituent monomers, and may contain non-acrylic monomers, but acrylic monomers account for all the monomers constituting the acrylic pressure-sensitive adhesives. The proportion is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more.

Specific examples of synthetic rubber adhesives include styrene-butadiene rubber, polyisobutylene rubber, isobutylene-isoprene, styrene-isoprene block copolymers, styrene-isoprene-styrene block copolymers, styrene-butadiene block copolymers, A styrene-ethylene-butylene block copolymer and the like can be mentioned.

Specific examples of urethane pressure-sensitive adhesives include reaction products of polyester polyols or polyether polyols and polyisocyanate compounds.

Specific examples of silicone pressure-sensitive adhesives include those containing silicone rubber and silicone resin.

The adhesive constituting the adhesive layer 2 may be a removable adhesive.
In this specification, the term "removable pressure-sensitive adhesive" refers to a pressure-sensitive adhesive that is used in a form that is peeled off from an adherend after being attached to the adherend.

The pressure-sensitive adhesive layer 2 may be mainly composed of a pressure-sensitive adhesive, and may contain components other than the pressure-sensitive adhesive.

Such components include, for example, ultraviolet absorbers, tackifiers, fillers, softeners, antioxidants, light stabilizers, cross-linking agents, colorants, modifiers, rust inhibitors, flame retardants, hydrolysis Inhibitors, surface lubricants, corrosion inhibitors, heat stabilizers, lubricants, antistatic agents, polymerization inhibitors, catalysts, leveling agents, thickeners, dispersants, antifoaming agents, surfactants and the like.

The pressure-sensitive adhesive layer 2 may be protected with a release liner (not shown). As a result, it is possible to effectively prevent adhesion of dust or the like during storage, transportation, or the like, and adhesion to undesired portions.

(Antibacterial layer)
The antibacterial layer 3 is made of a material containing an antibacterial agent, and has a function of imparting antibacterial properties to the member 50 with the adhesive film 10 attached to the member 50 . The antibacterial layer 3 is a portion exposed to the outside when the adhesive film 10 is used (attached to the member 50).

As the antibacterial agent, for example, various inorganic antibacterial agents, various organic antibacterial agents, composite materials thereof (inorganic/organic hybrid antibacterial agents), and the like can be used.

Examples of organic antibacterial agents include phenol ether antibacterial agents, imidazole antibacterial agents, pyrithione antibacterial agents, sulfone antibacterial agents, N-haloalkylthio compounds, anilide derivatives, pyrrole antibacterial agents, quaternary ammonium salts, and pyridine. compounds, triazine-based compounds, thiazoline-based antibacterial agents (eg, benzisothiazoline-based compounds, isothiazoline-based compounds), and the like.

More specifically, 1,2-benzisothiazolin-3-one, N-fluorodichloromethylthio-phthalimide, 2,3,5,6-tetrachloroisophthalonitrile, N-trichloromethylthio-4-cyclohexene-1 , 2-dicarboximide, copper 8-quinolinate, bis(tributyltin) oxide, 2-(4-thiazolyl)benzimidazole, 2-benzimidazole methylcarbamate, 10,10′-oxybisphenoxyarsine, 2, 3,5,6-tetrachloro-4-(methylsulfone)pyridine, bis(2-pyridylthio-1-oxide)zinc, N,N-dimethyl-N'-(fluorodichloromethylthio)-N'-phenylsulfamine poly(hexamethylenebiguanide) hydrochloride, dithio-2-2'-bis(benzmethylamide), 2-methyl-4,5-trimethylene-4-isothiazolin-3-one, 2-bromo-2- nitro-1,3-propanediol, hexahydro-1,3-tris-(2-hydroxyethyl)-S-triazine, p-chloro-m-xylenol and the like.

As the organic antibacterial agent, for example, a natural antibacterial agent may be used. Natural antibacterial agents include, for example, chitosan, which is a basic polysaccharide obtained by hydrolyzing chitin contained in crab and shrimp crustaceans, horseradish extract, moso-chiku extract, and the like.

Examples of inorganic antibacterial agents include various metals such as silver, copper, zinc, iron, lead, bismuth, gold, platinum, titanium, and nickel, and metal compounds (metal compounds).

Examples of metal compounds include oxides, sulfides, sulfates, and halides of the above metals.

Examples of antibacterial agents include those in which the above metals, their ions (metal ions), and metal compounds are supported on carriers.

Examples of the carrier include zeolites such as natural zeolite and synthetic zeolite; metal oxides such as aluminum oxide, magnesium oxide, titanium oxide and zinc oxide; hydroxides such as hydrous titanium oxide, hydrous bismuth oxide and hydrous antimony oxide; Hydrous oxide; phosphates such as zirconium phosphate, titanium phosphate, calcium phosphate, apatite (apatite), magnesium phosphate, aluminum phosphate, manganese phosphate, iron phosphate; carbonates such as calcium carbonate; silicates such as calcium acid and magnesium silicate; titanic acids such as potassium titanate and calcium titanate; basic salts and composite hydrous oxides such as hydrotalcite; (III) salts; zinc hexacyano; alumina; silica; bentonite; clay; talc;

More specifically, examples of inorganic antibacterial agents in which a metal or metal ion is supported on a carrier include zeolite antibacterial agents, calcium silicate antibacterial agents, zirconium phosphate antibacterial agents, calcium phosphate antibacterial agents, oxidation Zinc antibacterial agent, soluble glass antibacterial agent, silica gel antibacterial agent, activated carbon antibacterial agent, titanium oxide antibacterial agent, titania antibacterial agent, organometallic antibacterial agent, ion exchange ceramic antibacterial agent, layered phosphoric acid Examples include salt-quaternary ammonium salt-based antibacterial agents, antibacterial stainless steel, and the like.

Examples of inorganic/organic hybrid antibacterial agents include antibacterial agents in which a metal complex salt such as an isothiazoline compound is supported on a cation-exchangeable inorganic compound.

In particular, the antibacterial layer 3 preferably contains an antibacterial agent carrying Ag ions.
Thereby, the antibacterial property of the adhesive film 10 can be further improved. In addition, while improving the antibacterial properties, the transparency (light transmittance) of the antibacterial layer 3 can be improved, and the visibility of the printed layer 52 in a state of being attached to the member 50 can be further improved. . In addition, the antibacterial agent can be contained more uniformly in the antibacterial layer 3, and the occurrence of unwanted variations in antibacterial properties at each site can be effectively prevented.

In the antibacterial layer 3 , the antibacterial agent may be in a state of being compatible with other components (for example, resin material, etc.), but it is preferably dispersed in the antibacterial layer 3 .

As a result, the antibacterial properties of the antibacterial agent can be exhibited more effectively. In addition, excellent antibacterial properties can be exhibited over a longer period of time, and the durability of the adhesive film 10 can be improved.

In particular, the antibacterial agent contained in the antibacterial layer 3 is preferably granular with an average particle diameter of 100 nm or more and 5000 nm or less.

As a result, the antibacterial properties of the antibacterial agent can be exhibited more effectively. In addition, excellent antibacterial properties can be exhibited over a longer period of time, and the durability of the adhesive film 10 can be improved.

Thus, the average particle diameter of the particulate antibacterial agent is preferably 100 nm or more and 5000 nm or less, more preferably 300 nm or more and 4500 nm or less, and even more preferably 500 nm or more and 4000 nm or less.
As a result, the effects as described above are exhibited more remarkably.

In addition, in this specification, the average particle diameter refers to the volume-based average particle diameter. For the average particle size, for example, the sample is added to methanol and dispersed for 3 minutes with an ultrasonic disperser. It can be obtained by the measurement.

Further, when the particulate antibacterial agent (dispersoid) is dispersed in the dispersion medium in the antibacterial layer 3, at least part of the antibacterial agent is exposed and protruded on the outer surface of the antibacterial layer 3 (outer surface of the adhesive film 10). preferably
Thereby, the antibacterial property of the adhesive film 10 can be further improved.

The constituent material of the dispersion medium for dispersing the antibacterial agent (dispersoid) is not particularly limited, but examples include polyolefins such as polyethylene and polypropylene, acrylic resins, vinyl acetate resins, urethane resins, ABS resins, polyamides, polyesters, and the like and the like.

Above all, the antibacterial layer 3 preferably contains a resin material containing at least one of polyester and acrylic resin in addition to the antibacterial agent.

As a result, the adhesion of the antibacterial layer 3 to the base material 1 can be improved, and for example, even when stress such as bending is applied, the antibacterial layer 3 is more effectively prevented from unintentionally peeling off. can be prevented. In addition, since these materials are excellent in transparency, the transparency (light transmittance) of the antibacterial layer 3 can be improved, and the printed layer 52 in the state where the adhesive film 10 is adhered to the member 50 visibility can be further improved. In addition, since these materials have excellent affinity with the above-described antibacterial agents (especially, antibacterial agents carrying Ag ions, etc.), the uniform dispersibility of the antibacterial agent in the antibacterial layer 3 can be improved. Advantageous.

As the dispersion medium (binder), the medium of the printing ink or the ink itself may be used.

The content of the resin material in the antibacterial layer 3 is not particularly limited, but is preferably 30% by mass or more and 90% by mass or less, more preferably 40% by mass or more and 88% by mass or less, and 50% by mass or more. It is more preferably 85% by mass or less.

As a result, the content of the antibacterial agent in the antibacterial layer 3 can be sufficiently increased, and the adhesion of the antibacterial layer 3 to the base material 1 can be improved while maintaining sufficient antibacterial properties. Even when stress is applied, it is possible to more effectively prevent the antibacterial layer 3 from unintentionally peeling off. In addition, the visibility of the printed layer 52 can be further improved with the adhesive film 10 attached to the member 50 .

The content of the antibacterial agent in the antibacterial layer 3 is not particularly limited, but is preferably 0.1% by mass or more and 40% by mass or less, more preferably 0.5% by mass or more and 20% by mass or less, More preferably, it is 1% by mass or more and 10% by mass or less.

Thereby, the antibacterial property of the adhesive film 10 can be further improved. In addition, the content of the resin material in the antibacterial layer 3 can be increased, and the adhesion of the antibacterial layer 3 to the base material 1 can be improved. For example, even when stress such as bending is applied, the antibacterial layer 3 It is possible to more effectively prevent the unintentional peeling of the coating. In addition, the visibility of the printed layer 52 can be further improved with the adhesive film 10 attached to the member 50 .

Moreover, the antibacterial layer 3 may contain components other than the materials described above. Examples of such components include coloring agents such as dyes and pigments, antioxidants such as anilides and phenols, ultraviolet absorbers such as benzophenones and benzotriazoles, light stabilizers, modifiers, and rust preventives. agents, fillers, surface lubricants, corrosion inhibitors, heat stabilizers, lubricants, antistatic agents, polymerization inhibitors, cross-linking agents, catalysts, plasticizers, leveling agents, thickeners, softeners, dispersants, etc. be done.

Although the thickness of the antibacterial layer 3 is not particularly limited, it is preferably 0.05 μm or more and 10 μm or less, and more preferably 0.1 μm or more and 5 μm or less.

As a result, it is possible to further improve the followability to the shape of the surface of the member 50 while improving the antibacterial property of the adhesive film 10. For example, the surface of the member 50 (the part to which the adhesive film 10 is attached) has a curvature. Excellent adhesion can be ensured even on a curved surface with a small radius. Moreover, the transparency of the base material 1 can be suitably improved, and the visibility of the printed layer 52 through the adhesive film 10 can be improved.

In addition, when the thickness of the antibacterial layer 3 (if the antibacterial agent protrudes, the thickness at the other part) is T [μm] and the average particle size of the antibacterial agent is D [μm], 0 .3≤T/D≤3.0, more preferably 0.4≤T/D≤2.0, and 0.5≤T/D≤0. It is even more preferable to satisfy the relationship of 9.
Thereby, the antibacterial property of the adhesive film 10 can be further improved.

The adhesive film 10 may have sufficient light transmittance to allow the printed layer 52 of the adherend 50 to be recognized when attached to the adherend 50. For example, the total light transmittance (JIS K7361-1: value measured according to 1997) is preferably 20% or more and 100% or less, more preferably 30% or more and 100% or less, and 50% or more and 100% or less. preferable.

Thereby, the visibility of the printed layer 52 of the adherend 50 with the adhesive film 10 attached can be further improved.

In addition, the haze (value measured according to JIS K7136:2000) of the adhesive film 10 is preferably 2.0% or less, more preferably 1.0% or less, and 0.8% or less. It is more preferable to have

As a result, the transparency of the adhesive film 10 becomes very high, and the visibility of the printed layer 52 of the adherend 50 with the adhesive film 10 adhered can be further improved.

The member (adherend) 50 to which the adhesive film 10 is attached may be of any shape, and examples of the shape of the adhesive film 10 include a film shape and a sheet shape.

[Adhered body]
Next, the adhesive body according to the present invention will be described.
FIG. 3 is a schematic vertical cross-sectional view showing a preferred embodiment of an adhesive body to which the adhesive film of the present invention is attached.

The adherend 100 has a structure in which the adhesive film 10 described above is adhered to a member (adherend) 50 . The member 50 has a base material 51 and a printed layer 52 , and the adhesive film 10 is adhered so as to cover the printed layer 52 .

Further, as shown in FIG. 3, in the adhesive body 100 of the present embodiment, the member 50 has an adhesive layer 53 on the side opposite to the side of the substrate 51 on which the printed layer 52 is provided. there is

Since the member 50 has the adhesive layer 53 in this manner, the adhesive body 100 can be attached to another member.

Further, the adhesive film 10 can be attached later to the member 50 that has already been attached to another member to obtain the attached body 100 . As a result, antibacterial properties can be imparted to a member that has already been used with the member 50 attached, or a member that has already been attached with the member 50 and is waiting for shipment. can.

Further, the adhesive force of the adhesive film 10 to the member 50 (peeling force when the adhesive film 10 is peeled off from the member 50) is the adhesive force of the member 50 to the other member (when peeling the member 50 from the other member is preferably smaller than the peel force of

As a result, for example, when the antibacterial property of the adhesive film 10 is reduced (for example, when the adhesive film 10 is replaced), the member 50 is prevented from unintentionally peeling off from the other member. The adhesive film 10 can be selectively peeled off while effectively preventing it.

As the peel strength, the peel strength obtained by measurement according to the 180° peel test specified in JIS Z0237:2009 under the condition that the peel speed is 300 mm/min can be adopted.

The base material 51 may be made of any material, and examples of constituent materials of the base material 51 include polyethylene, polypropylene, ethylene/propylene copolymer, ethylene/vinyl acetate copolymer, and ethylene/methyl acrylate. Polyolefins such as copolymers, ethylene/ethyl acrylate copolymers, ethylene/butyl acrylate copolymers, ethylene/methacrylic acid copolymers, and ethylene/methyl methacrylate copolymers; acrylic resins; vinyl acetate resins; Polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate, and polyethylene naphthalate; acetate resins, acrylonitrile-butadiene-styrene copolymer (ABS) resins, polystyrene, polyvinyl chloride, polyamides, polyesteramides, polyethers, polyimides, polyamideimides , poly-p-phenylene sulfide, polyether ester and the like, and one or more selected from these can be used in combination.

Also, the base material 51 may contain components other than the materials described above. Examples of such components include coloring agents such as dyes and pigments, antioxidants such as anilides and phenols, ultraviolet absorbers such as benzophenones and benzotriazoles, light stabilizers, modifiers, and rust preventives. agents, fillers, surface lubricants, corrosion inhibitors, heat stabilizers, lubricants, antistatic agents, polymerization inhibitors, cross-linking agents, catalysts, plasticizers, leveling agents, thickeners, softeners, dispersants, etc. be done.

Moreover, the base material 51 may be composed of a single layer, or may be a laminate including a plurality of layers. Further, the base material 51 may be made of, for example, a gradient material whose composition changes in a gradient manner in the thickness direction.

Further, the base material 51 may be subjected to a surface treatment for enhancing adhesion with the printed layer 52 and the adhesive layer 53 .

The thickness of the base material 51 is preferably 20 μm or more and 500 μm or less, more preferably 30 μm or more and 300 μm or less, and even more preferably 40 μm or more and 200 μm or less.

The printed layer 52 is a part having a function of giving information such as colors, patterns, characters, symbols, and graphics to the observer, and is a part formed by printing.

A printing method used to form the printed layer 52 is not particularly limited, and examples thereof include gravure printing, flexographic printing, offset printing, and the like.

Examples of ink that can be used to form the print layer 52 include water-based ink, oil-based ink, UV ink, and latex ink.

The adhesive layer 53 is made of a material containing an adhesive, and has a function of adhering to the other member and fixing the member 50 (adhesion body 100) to the other member.

Examples of adhesives forming the adhesive layer 53 include acrylic adhesives, synthetic rubber adhesives, urethane adhesives, and silicone adhesives.

Acrylic pressure-sensitive adhesives may contain acrylic monomers as constituent monomers, and may contain non-acrylic monomers, but acrylic monomers account for all the monomers constituting the acrylic pressure-sensitive adhesives. The proportion is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more.

Specific examples of synthetic rubber adhesives include styrene-butadiene rubber, polyisobutylene rubber, isobutylene-isoprene, styrene-isoprene block, styrene-isoprene-styrene block copolymer, styrene-butadiene block copolymer, styrene-ethylene. - butylene block copolymers and the like.

Specific examples of urethane pressure-sensitive adhesives include reaction products of polyester polyols or polyether polyols and polyisocyanate compounds.

Specific examples of silicone pressure-sensitive adhesives include those containing silicone rubber and silicone resin.

The adhesive layer 53 may be mainly composed of an adhesive, and may contain components other than the adhesive.

Such components include, for example, ultraviolet absorbers, tackifiers, fillers, softeners, antioxidants, light stabilizers, cross-linking agents, colorants, modifiers, rust inhibitors, flame retardants, hydrolysis Inhibitors, surface lubricants, corrosion inhibitors, heat stabilizers, lubricants, antistatic agents, polymerization inhibitors, catalysts, leveling agents, thickeners, dispersants, antifoaming agents, surfactants and the like.

[Method for producing adhesive film]
Next, a preferred embodiment of the method for manufacturing the adhesive film 10 will be described.

First, the film substrate 1 as described above is prepared, and the antibacterial layer 3 is formed on one surface thereof.
The formation of the antibacterial layer 3 is performed, for example, by applying a liquid composition containing the constituent materials of the antibacterial layer 3 to the base by various coating methods such as gravure coating, bar coating, roll coating, reverse coating, knife coating, die coating, and comma coating. It can be done by coating on the material 1 .
The antibacterial layer 3 can be formed by solidifying the coating film of the coating liquid.

Then, the pressure-sensitive adhesive layer 2 is formed on the other surface of the film substrate 1 (the surface opposite to the surface on which the antibacterial layer 3 is provided). The method of forming the pressure-sensitive adhesive layer 2 is not particularly limited, but it can be suitably formed by applying a pressure-sensitive adhesive composition on the other surface of the film substrate 1 .

Application of the pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer 2 is performed, for example, by applying a liquid pressure-sensitive adhesive composition (coating liquid) to roll coating, gravure coating, reverse coating, knife coating, die coating, comma coating, bar It can be carried out by coating the film substrate 1 with various coating methods such as coating.
The adhesive layer 2 can be formed by solidifying the coating film of the coating liquid.

Alternatively, the pressure-sensitive adhesive layer 2 may be once formed on a release liner and then attached to the film substrate 1 .

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above.

For example, the adhesive film may have at least one intermediate layer between the film substrate and the adhesive layer or between the film substrate and the antibacterial layer.

DESCRIPTION OF SYMBOLS 10... Adhesive film 1... Film base material 11... 1st surface 12... 2nd surface 2... Adhesive layer (film adhesive layer)
3... Antibacterial layer 50... Member (adherend)
51... Base material 52... Printed layer (printed portion)
53... Adhesive layer 100... Sticking body

Claims (3)

An adhesive film that is adhered to a member having a substrate and a printed layer so as to cover the printed layer and has a haze of 2.0% or less as a value measured according to JIS K7136:2000. hand,
a film substrate;
A pressure-sensitive adhesive layer provided on one side of the film substrate and made of a material containing a pressure-sensitive adhesive;
An antibacterial layer provided on the other surface side of the film substrate and made of a material containing an antibacterial agent,
The film substrate is made of a material containing at least one of polyester and polyolefin, has a thickness of 15 μm or more and 75 μm or less, and is coated with an easily adhesive resin selected from polyester, acrylic, and polyurethane. has been processed,
The antibacterial layer contains a polyester and a cross-linking agent, has a thickness of 0.1 μm or more and 5 μm or less, and has a content of the antibacterial agent of 1% by mass or more and 20% by mass or less,
The pressure-sensitive adhesive film, wherein the antibacterial agent is granular and has an average particle diameter of 100 nm or more and 4000 nm or less. The adhesive film according to claim 1, wherein the antibacterial layer contains the antibacterial agent carrying Ag ions. The pressure-sensitive adhesive film according to claim 1 or 2, wherein the surface treatment is for enhancing adhesion between the film substrate and the antibacterial layer.

Images