JP6885502B1 - Adhesive sheet and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive sheet which imparts antiviral property or other functionality in addition to antiviral property to an article while maintaining the original design to be attached, and a method for producing the same. SOLUTION: A transparent extensible film layer 20, an adhesive layer 30 formed on one surface side of the extensible film layer 20, and a surface side of the adhesive layer 30 opposite to the extensible film layer 20. It has a peelable sheet 40 formed in, and has a surface protective layer 80 on the other surface side of the extensibility film layer 20, and the surface protective layer 80 is a thermosetting resin and ultraviolet curable in addition to an antiviral agent. It contains at least one of a mold resin and an electron beam curable resin, and the amount of the antiviral agent added to the surface protective layer 80 is 0.2% by mass or more and 20% by mass or less, and the average particle size of the antiviral agent is It is 1 μm or more and 10 μm or less. Further, a plurality of groove portions 90 formed on the surface side of the pressure-sensitive adhesive layer 30 opposite to the film layer 20 may be provided. [Selection diagram] Fig. 1

Description

The present invention relates to an adhesive sheet used for building materials such as general fittings and a method for manufacturing the same.

Conventionally, a sheet that has been made possible to impart antiviral properties by adding an antiviral agent has an antiviral effect on the surface because most of the antiviral agents are kneaded into a resin and contained in a molded product. There was a problem that was not shown.
On the other hand, a sheet having excellent antiviral properties has been proposed by adding an antiviral agent to the outermost surface of the sheet (see, for example, paragraph [0018] and FIG. 1 of Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-0880887

However, re-covering the sheet requires a lot of stress and cost from the peeling work to the re-construction, and also damages the base material such as the wall surface at the time of re-covering, which accelerates the deterioration of the building.
In addition, it costs more than re-covering to replace the entire article such as doors and fittings in order to avoid re-covering.
In addition, for consumers who want to use the current designs such as walls and furniture as they are, patterned, opaque, and translucent sheets are an obstacle.

The present invention has been made in view of the above circumstances, and provides an adhesive sheet that imparts antiviral properties or other functionality to an article while retaining the original design to be attached. The purpose is.

The pressure-sensitive adhesive sheet according to one aspect of the present invention includes a transparent stretchable film layer, a pressure-sensitive adhesive layer formed on one surface side of the stretchable film layer, and the stretchable film layer of the pressure-sensitive adhesive layer. It has a peelable sheet formed on the opposite surface side and a surface protective layer on the other surface side of the extensibility film layer, and the surface protective layer is made of a heat-curable resin and ultraviolet rays in addition to an antiviral agent. It contains at least one of a curable resin and an electron beam curable resin, and the amount of the antiviral agent added to the surface protective layer is 0.2% by mass or more and 20% by mass or less, and the average granules of the antiviral agent. The diameter is 1 μm or more and 10 μm or less.

The pressure-sensitive adhesive sheet according to one aspect of the present invention is characterized by including a plurality of grooves formed on the surface side of the pressure-sensitive adhesive layer opposite to the film layer.
The pressure-sensitive adhesive sheet according to one aspect of the present invention is characterized in that the antiviral agent is a silver-based material.
The pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive sheet according to one aspect of the present invention has a pattern layer in the extensible film layer.
The pressure-sensitive adhesive sheet according to one aspect of the present invention is characterized in that a plurality of peaks of the particle size of the antiviral agent are present.

The method for producing an adhesive sheet according to one aspect of the present invention includes a transparent extensible film layer, an adhesive layer formed on one surface side of the extensible film layer, and the extension of the adhesive layer. It has a peelable sheet formed on the surface side opposite to the sex film layer and a surface protective layer on the other surface side of the extensibility film layer, and the surface protective layer is heat-curable in addition to an antiviral agent. It contains at least one of a resin, an ultraviolet curable resin, and an electron beam curable resin, and the amount of the antiviral agent added to the surface protective layer is 0.2% by mass or more and 20% by mass or less, and the antiviral agent. The average particle size of the antiviral agent is 1 μm or more and 10 μm or less. It is characterized in that the extracted ones having different particle sizes are mixed.

According to one aspect of the present invention, it is possible to provide an adhesive sheet that imparts antiviral properties or other functions in addition to antiviral properties to an article while retaining the original design to be attached.

It is sectional drawing of the adhesive sheet which concerns on embodiment. It is explanatory drawing which shows the particle size distribution of an antiviral agent.

(Embodiment)
Hereinafter, the pressure-sensitive adhesive sheet according to one embodiment of the present invention will be described with reference to the drawings.
Here, the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones.
Further, the embodiments shown below exemplify a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, etc. of the constituent parts as follows. It is not specific to the thing.
The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

(Adhesive sheet 10)
The basic configuration of the pressure-sensitive adhesive sheet 10 according to the first embodiment of the present disclosure will be described with reference to FIG. FIG. 1 is a cross-sectional view for explaining a configuration example of the pressure-sensitive adhesive sheet 10 according to the first embodiment of the present disclosure.
As shown in FIG. 1, the pressure-sensitive adhesive sheet 10 according to the embodiment of the present invention is formed on one surface (hereinafter, referred to as “back surface 22”) of the extensible film layer 20 and the extensible film layer 20. It is provided with a pressure-sensitive adhesive layer 30. A peelable sheet 40 is attached to the side of the pressure-sensitive adhesive layer 30 opposite to the extensibility film layer 20 (hereinafter referred to as "back surface 31"). The adhesive sheet 10 is suitable for wallpaper, for example.

(Extensible film layer 20)
The extensibility film layer 20 includes a first base material layer 50, a second base material layer 60 arranged on the surface opposite to the pressure-sensitive adhesive layer 30 of the first base material layer 50, that is, on the side of the surface 51, and first. A pattern layer 70 arranged between the base material layer 50 and the second base material layer 60 is provided.
An example in which the surface protective layer 80 is arranged on the surface 21 of the extensibility film layer 20 on the side of the second base material layer 60 will be described, but the configuration is not limited to this.

(First base material layer 50)
The first base material layer 50 is a sheet-like member that serves as a base for the pressure-sensitive adhesive sheet 10 together with the second base material layer 60.
As the material of the first base material layer 50, for example, a polypropylene resin, an acrylonitrile-butadiene-styrene copolymer, a resin having excellent heat resistance, fire resistance, and mechanical strength such as polycarbonate can be used. The first base material layer 50 is a transparent layer.
Further, the thickness of the first base material layer 50 is preferably 50 μm or more and 150 μm or less in order to satisfy the hiding property while imparting various physical properties such as a target sufficient strength. When it is 50 μm or more, various physical properties such as strength and concealment are improved. Further, when it is 150 μm or less, other physical properties such as fire protection performance are improved.

(Second base material layer 60)
The second base material layer 60 is a sheet-like member that serves as a base for the pressure-sensitive adhesive sheet 10 together with the first base material layer 50.
The resin constituting the second base material layer 60 includes, for example, polypropylene resin and acrylonitrile / butadiene / styrene from the viewpoint of heat resistance, cold resistance, and mechanical strength, as in the case of the film of the first base material layer 50. Polymers, polycarbonate and the like can be used. Further, the second base material layer 60 has transparency so that the pattern layer 70 can be visually recognized.
The thickness of the second base material layer 60 is preferably 50 μm or more and 100 μm or less in order to satisfy other physical properties such as fire protection performance while imparting the target sufficient elasticity and impact resistance.
Further, in this example, an example in which the second base material layer 60 is provided will be described, but the configuration is not limited to this. For example, the second base material layer 60 may not be provided as needed.

(Pattern layer 70)
The pattern layer 70 is a layer for decorating the surface layer side of the adhesive sheet 10 with a pattern.
The pattern layer 70 is formed by printing a pattern on the surface 51 of the first base material layer 50, and a coating film of printing ink is used. The printing ink is not particularly limited as long as it satisfies the requirements of light resistance, color development and safety of ingredients used, which are generally required for wallpaper. Safety requirements include, for example, materials that do not contain heavy metals or sulfur compounds as pigments or additives. The pattern layer 70 is such that it does not interfere with the visibility of the design of the article to be attached.
The thickness of the pattern layer 70 may be such that the desired design property is sufficiently exhibited. The thickness of the pattern layer 70 is preferably in the range of, for example, 0.1 μm or more and 10 μm or less.
Further, in this example, an example in which the pattern layer 70 is provided on the surface 51 of the first base material layer 50 will be described, but the configuration is not limited to this. For example, the pattern layer 70 may not be provided as needed.

(Surface protection layer 80)
The surface protective layer 80 is a layer for protecting the first base material layer 5 and the pattern layer 70.
The surface protective layer 80 has transparency so that the design and the pattern layer 70 of the article to be attached can be visually recognized, and also has physical properties such as sufficient strength, stain resistance, and weather resistance necessary for protection.
The surface protective layer 80 includes, for example, a solvent such as methyl ethyl ketone, a polyurethane resin, and an isocyanate-based curing agent on the surface of the second base material layer 60 opposite to the pattern layer 70 (hereinafter referred to as “surface 21”). A coating film formed by applying and drying a coating agent containing the above-mentioned material and then curing it by irradiation with ultraviolet rays is used.
Further, as the resin constituting the surface protective layer 80, an acrylic resin-based coating agent or the like may be used. The basis weight of the surface protective layer 80 is preferably ^{2.0 g / m 2} or more and 7.0 g / m ^{2 or less from the viewpoint of high surface strength.}

Specifically, the surface protective layer 80 is a layer provided to impart functions such as weather resistance, scratch resistance, stain resistance, and design to the adhesive sheet 10.
The surface protective layer 80 may be a single layer, or a plurality of layers may be stacked to form the surface protective layer 80.
As shown in FIG. 1, in the pressure-sensitive adhesive sheet 10 of the present embodiment, the surface protective layer 80 is provided as a single layer.
The surface protective layer 80 is formed by applying each layer and curing the coating film using a known coating device, heat drying device, and ultraviolet irradiation device according to the type of the curable resin. The protective layer 80 is formed.

Further, the surface protective layer 80 has an important role of determining the superiority or inferiority of the bending workability, weather resistance, scratch resistance and cleanability.
The surface protective layer 80 contains a curable resin (curable resin) as a main component.
That is, it is preferable that the resin component is substantially composed of a curable resin. Substantial means, for example, 80 parts by mass or more when the whole resin is 100 parts by mass. The surface protective layer 80 is provided with a colorant such as a weather resistant agent, a plasticizer, a stabilizer, a filler, a dispersant, a dye, a pigment, a solvent, an ultraviolet absorber, a heat stabilizer, a light stabilizer, and a blocking agent, if necessary. It may contain various additives such as an inhibitor, a catalyst trapping agent, a colorant, a light scattering agent and a gloss adjusting agent.

In the present embodiment, the surface protective layer 80 contains at least one of a thermosetting resin, an ultraviolet curable resin, and an electron beam curable resin.
The electron beam curable resin and the ultraviolet curable resin are collectively referred to as "ionizing radiation curable resin" below.
The surface protective layer 80 can generally be formed by applying a reactive resin to form a coating film, and then curing the coating film by heating or ionizing radiation irradiation.
In the surface protective layer 80, there are also differences in characteristics due to differences in the curing method.
For example, the surface protective layer 80 generally formed of an ionizing radiation curable resin tends to have high hardness and excellent scratch resistance because it has a high degree of cross-linking after a curing reaction.
On the other hand, the surface protective layer 80 formed of the thermosetting resin has a relatively low degree of cross-linking and therefore has a low hardness, and tends to be excellent in flexibility such as bending and following a base material.

The surface protective layer 80 may contain any one of a thermosetting resin, an ultraviolet curable resin, and an electron beam curable resin as a main component.
That is, the main component of the surface protective layer 80 may be a thermosetting resin alone, an ultraviolet curable resin, or an ionizing radiation curable resin alone.
For example, when the adhesive sheet 10 is used as a member for fittings having many complicated shapes, flexibility (for example, appropriate processing) is often required. Therefore, for example, in the pressure-sensitive adhesive sheet 10 used for fittings, it is preferable to use a thermosetting resin as the main component of the surface protective layer 80.
Further, when the pressure-sensitive adhesive sheet 10 is required to have scratch resistance rather than flexibility, it is preferable to use an ionizing radiation curable resin.

Further, the main component of the surface protective layer 80 may be a mixture of a thermosetting resin, an ultraviolet curable resin and an electron beam curable resin. When the mixture is the main component, the pressure-sensitive adhesive sheet 10 can be used for various purposes by controlling the ratio of the thermosetting resin, the ultraviolet curable resin, or the electron beam-curable resin in the surface protective layer 80 depending on the intended use. It can be used properly according to it.
For example, when the adhesive sheet 10 is used for fittings, the mixture of the thermosetting resin, the ultraviolet curable resin, and the electron beam curable resin, which are the main components of the surface protective layer 80, may contain the largest amount of the thermosetting resin. preferable.
Specifically, the thermosetting resin may account for more than 50% by weight, preferably 70% by weight or more, more preferably 75% by weight or more, and 80% by weight or more in the mixture. Is even more preferable.

Further, for example, when the pressure-sensitive adhesive sheet 10 is required to have scratch resistance, the mixture of the thermosetting resin, the ultraviolet curable resin, and the electron beam curable resin, which are the main components of the surface protective layer 80, is an ultraviolet curable resin or an electron beam. It is preferable that at least one of the curable resins is contained in the largest amount.
Specifically, the ultraviolet curable resin or the electron beam curable resin may occupy more than 50% by weight, preferably 70% by weight or more, and more preferably 75% by weight or more in the mixture. It is more preferable to occupy 80% by weight or more.

As described above, by making the main component of the surface protective layer 80 a mixture of the thermosetting resin, the ultraviolet curable resin and the electron beam curable resin, the scratch resistance is satisfied and at the same time, the surface protective layer 80 is used in the bending process. Whitening and cracking are less likely to occur.
However, the performance of the adhesive sheet 10 such as scratch resistance and processability as described above is not determined only by the difference in the curing method of the resin used for the surface protective layer 80.
Regarding the performance of the adhesive sheet 10 (here, scratch resistance and processing suitability), the material design of the resin itself and the action of adding additives such as fillers, that is, the physical properties of various components contained in the surface protective layer 80 greatly contribute to the performance. .. Therefore, the design of the surface protective layer 80 as a whole becomes important.

(Ionizing radiation curable resin)
Here, the ionizing radiation curable resin (including the ultraviolet curable resin and the electron beam curable resin) used for the surface protective layer 80 is not particularly limited, and the polymerization cross-linking reaction can be carried out by irradiation with ionizing radiation such as ultraviolet rays and electron beams. A prepolymer (including an oligomer) containing a radically polymerizable double bond in the molecule and / or a transparent resin containing a monomer as a main component can be used.
These prepolymers or monomers can be used alone or in admixture. The curing reaction in the ionizing radiation curable resin is usually a cross-linking curing reaction.
Specifically, the above-mentioned prepolymer or monomer has a radically polymerizable unsaturated group such as a (meth) acryloyl group, a (meth) acryloyloxy group, a cationically polymerizable functional group such as an epoxy group, or the like in the molecule. Examples include compounds.
Here, the (meth) acryloyl group means an acryloyl group or a methacryloyl group.

Examples of the prepolymer having a radically polymerizable unsaturated group include polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and silicone (meth) acrylate. And so on. The molecular weight of these is usually preferably about 250 to 100,000.
Examples of the monomer having a radically polymerizable unsaturated group include methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and phenoxyethyl (meth) acrylate as monofunctional monomers.

Examples of the polyfunctional monomer include diethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethylene oxide tri (meth) acrylate, and dipentaerythritol tetra (). Examples thereof include meta) acrylate, dipentaerythritol penta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate.
Examples of the prepolymer having a cationically polymerizable functional group include prepolymers of epoxy resins such as bisphenol type epoxy resins and novolak type epoxy compounds, and vinyl ether resins such as fatty acid vinyl ethers and aromatic vinyl ethers.

Further, as the above-mentioned prepolymer, a polyene / thiol-based prepolymer obtained by combining a polyene and a polythiol is also preferable. Examples of the thiol include polythiols such as trimethylolpropane trithioglycolate and pentaerythritol tetrathioglycolate.
Examples of the polyene include those in which allyl alcohol is added to both ends of polyurethane made of diol and diisocyanate.

As the ionizing radiation used for curing the ionizing radiation curable resin, electromagnetic waves or charged particles having energy capable of curing the molecules in the ionizing radiation curable resin (composition) are used.
Usually, ultraviolet rays or electron beams may be used, but visible rays, X-rays, ion rays and the like may be used.
As the ultraviolet source, for example, a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light, or a metal halide lamp can be used.
The wavelength of ultraviolet rays is usually preferably in the range of 190 nm or more and 380 nm or less.

As the electron beam source, for example, various electron beam accelerators such as Cockcroft-Walton type, Van de Graaff type, resonance transformer type, insulated core transformer type, linear type, dynamitron type, and high frequency type can be used.
Among them, those capable of irradiating electrons having an energy in the range of 100 keV or more and 1000 keV or less are particularly preferable, and those capable of irradiating electrons having an energy of 100 keV or more and 300 keV or less are more preferable.

(Thermosetting resin)
Here, the thermosetting resin used for the surface protective layer 80 is not particularly limited, and examples thereof include a two-component curable urethane resin.
The two-component curable urethane resin is not particularly limited, but among them, a polyol component having an OH group (acrylic polyol, polyester polyol, polyether polyol, epoxy polyol, etc.) as a main component and an isocyanate component (trilens) which is a curing agent component. Those containing isocyanate, hexamethylene diisocyanate, metaxylene diisocyanate, etc.) can be used. The thermosetting resin is not limited to these, and a one-component reaction-curable polyurethane resin, a one-component or two-component reaction-curable epoxy resin, or the like may be used.

Further, a surfactant is added to the surface protective layer 80.
Surfactants include at least one of a cationic surfactant, an amphoteric surfactant or a nonionic surfactant.
Due to the addition of the surfactant, the compatibility between the silver-based antiviral agent and the surface protective layer in the binder is improved, and the concentration variation due to the precipitation of the antiviral agent during coating is suppressed. Can be obtained.
The layer thickness of the surface protective layer 80 is preferably in the range of 3 μm or more and 15 μm or less in the layer containing the antiviral agent.
When the thickness of the surface protective layer 80 is 3 μm or more, various resistances such as scratch resistance, abrasion resistance, and weather resistance are improved. When the thickness of the first surface protective layer 80a is 15 μm or less, it is not necessary to use an unnecessarily large amount of resin material, and the cost can be reduced.

Further, the surface of the surface protective layer 80 may be embossed (concavo-convex embossing using an embossed plate) to form (give) an embossed pattern.
In this case, the embossed pattern formed on the surface of the surface protective layer 80 can be configured to give a more three-dimensional effect due to the tactile sensation.
In the embossing process, for example, the adhesive sheet 10 may be provided with an uneven shape by passing a recess having a depth of 15 μm or more between the embossing roll and a rubber back roll having a hardness of 50 degrees or more and less than 90 degrees. good.
Examples of the hardness measuring method include the measuring method shown in JIS K-6253. Examples of the embossed pattern include a wood grain board conduit groove, a stone board surface unevenness, a cloth surface texturer, a satin finish, a grain, a hairline, and a perforated groove. As will be described later, the embossing process may be omitted and the embossing pattern may not be applied.

(Antiviral agent)
The surface protective layer 80 contains an antiviral agent that improves antiviral properties.
The antiviral agent is preferably a silver-based material.
Examples of the antiviral agent include antibacterial zeolite, antibacterial apatite, antibacterial zirconia, etc. formed by incorporating any metal ion of silver ion, copper ion, or zinc ion into a substance such as inorganic compound zeolite, apatite, or zirconia. Inorganic antibacterial agents can be used, and as antiviral agents, zincpyridione, 2- (4-thiazolyl) -benzoimidazole, 10,10-oxybisphenoxanodine, organic thizusouhalogen, pyridine-2-thiol- Oxide and the like can be used, but silver-based antiviral agents are superior in terms of antiviral effect.
Further, the antiviral agent may have a structure in which a silver-based material is supported on an inorganic material.

(Amount of antiviral agent added)
The amount of the antiviral agent added to the surface protective layer 80 is in the range of 0.2% by mass or more and 20% by mass or less.
When the amount of the antiviral agent added is 0.2% by mass or more, the antiviral agent acts effectively and the antiviral property is improved. When the amount of the antiviral agent added is 20% by mass or less, the scratch resistance is improved.

(Average particle size of antiviral agent)
The average particle size of the antiviral agent is preferably 0.5 times or more and 2 times or less with respect to the thickness of the surface protective layer 80.
That is, it is desirable that the relationship of 0.5 ≦ Φ ≦ 2D is established when the average particle size of the antiviral agent is Φ and the thickness of the surface protective layer is D.
When the average particle size of the antiviral agent is 0.5 times or more and 2 times or less that of the surface protective layer 80, the antiviral property is good due to the expansion of the contact surface with the antiviral agent and the expansion of the surface area of the antiviral agent itself. Become.
The average particle size of the antiviral agent is preferably 1 μm or more and 10 μm or less.
When the average particle size of the antiviral agent is 1 μm or more, the contact area between the surface protective layer 80 and the antiviral agent is improved, and the antiviral property is improved. When the average particle size of the antiviral agent is 10 μm or less, the scratch resistance is improved.

(Multiple peaks of antiviral particle size)
Further, it is preferable that a plurality of peaks of the particle size of the antiviral agent are present.
Specifically, the particle size of the antiviral agent has two peaks, the first peak in the range of 1 μm or more and 5 μm or less, and the second peak in the range of 5 μm or more and 10 μm or less. It is preferable to include and.
Here, the second peak of the particle size of the antiviral agent is set to a value larger than the first peak.
Since there are a plurality of peaks of the particle size of the antiviral agent, the packing density of the antiviral agent can be further improved, and more antiviral agents can be added. Therefore, the contact area with the antiviral agent is expanded, and the surface area of the antiviral itself is also expanded, so that the antiviral property is improved.

(Surface protection layer 80)
In addition to the antiviral agent, the surface protective layer 80 can be added with agents having various functions.
As the functionality, various options such as antibacterial property, anti-allergenic property, deodorant property, infrared reflection and the like can be considered, and those having a plurality of types of functions may be used.

(Adhesive layer 30)
The pressure-sensitive adhesive layer 30 is a layer for giving the stretchable film layer 20 adhesiveness.
As an example of the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer 30, an acrylic pressure-sensitive adhesive using acrylic acid or an acrylic acid ester as a starting material is used.
Examples of the acrylic pressure-sensitive adhesive include US Pat. No. 3,239,478, 3,935,338, 5,169,727, Reissue Patent No. 24906, and US Pat. No. 4,952,650. The adhesive disclosed in the same No. 4181752 can be adopted. Further, as a method for applying the pressure-sensitive adhesive composition, for example, roll coating or knife coating can be adopted.
The thickness of the thickest portion of the pressure-sensitive adhesive layer 30 is preferably 20 μm or more at the stage of drying after application of the pressure-sensitive adhesive composition in order to impart workability and sufficient adhesive strength.

(Groove 90)
The back surface 31 of the pressure-sensitive adhesive layer 30 may have irregularities that match the shape of the printing resin film 100, which will be described later. In this case, a plurality of groove portions 90 are formed as recesses.
Each groove 90 is terminated at the outer peripheral portion of the pressure-sensitive adhesive layer 30 or communicates with another groove portion 90 terminated at the outer peripheral portion of the pressure-sensitive adhesive layer 30.
As a result, when the pressure-sensitive adhesive sheet 10 is attached to the adherend, the air trapped between the pressure-sensitive adhesive layer 30 and the adherend can flow out to the surroundings. Then, after the air flows out to the surroundings, the bottom portion of the groove portion 90 is brought into close contact with the surface of the adherend, whereby the groove portion 90 can be eliminated. Further, by bringing the bottom portion of the groove portion 90 into close contact with the surface of the adherend, it is possible to improve impact resistance and cold resistance.

As the cross-sectional shape of the groove 90, for example, a V-shape, a U-shape, a rectangular shape, a trapezoidal shape, a linear shape, or the like can be adopted.
As a method for forming the groove 90, for example, it is preferable to manufacture the groove 90 by attaching a peelable sheet 40 having irregularities for forming the groove 90.
Alternatively, for example, by uniformly applying the adhesive to the back surface 22 of the first base material layer 50 of the extensibility film layer 20, and then stamping with a mold having irregularities for forming the groove 90, the groove portion is formed. A method of forming 90 can be adopted.

(Printing resin film 100)
A printing resin film 100 may be formed on this product.
The printing resin film 100 is a convex portion formed on the surface of the peelable sheet 40 on the side of the pressure-sensitive adhesive layer 30, that is, the adjacent surface 41, and which fits into the groove 90. The material constituting the printing resin film 100 is not particularly limited as long as it has a weak adhesiveness to the peelable sheet 40 and can print a pattern having a continuous opening on the peelable sheet 40. ..
Further, as the material constituting the printing resin film 100, a material capable of maintaining the printing resin film 100 for a long period of time without being attacked by a solvent such as acrylic or toluene of the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer 30 is used. .. For example, as the material constituting the printing resin film 100, a polyurethane resin mixed with a solvent such as methyl ethyl ketone can be used.

As a method for forming the printing resin film 100, for example, a method of applying by gravure printing to form the printing resin film 100 can be adopted. In addition, printing methods such as flexographic printing, offset printing, screen printing, and rotary printing can be used. Further, a method of embossing the printing resin film 100 using a roller-shaped mold, a method of embossing the printing resin film 100, a resin-made printing resin film 100 on the surface of a plastic film or the like using a roller-shaped mold and a fluid resin composition. Can be adopted.
The printing resin film 100 is terminated at the outer peripheral portion of the peelable sheet 40 or communicated with another printing resin film 100 terminated at the outer peripheral portion of the peelable sheet 40 according to the shape of the groove 90 described above. ..
By terminating the printing resin film 100 at the outer peripheral portion, the adhesive sheet 10 can be adhered to the adherend without invading air bubbles. Further, even after the adhesive sheet 10 is adhered and a long period of time has passed, it can be peeled off so that no peeling marks remain.

(Removable sheet 40)
The peelable sheet 40 is a sheet-like member to be attached to the pressure-sensitive adhesive layer 30.
The peelable sheet 40 includes, for example, a laminate in which a peelable layer mainly composed of a silicone resin is laminated on the surface of an appropriate base material such as a plastic film or paper, a polyolefin resin film such as a polyethylene film, or a polyethylene terephthalate resin film. Can be adopted.
(Production method)
The method for manufacturing the pressure-sensitive adhesive sheet 10 is as follows.
The pressure-sensitive adhesive sheet 10 is formed by laminating (1) the film layer 20, (2) the pressure-sensitive adhesive layer 30, and (3) the peelable sheet 40 in this order.

(Formation of the first base material layer 50 of the film layer 20)
As the first base material layer 50 of the film layer 20, a non-colored polypropylene film (manufactured by RIKEN TECHNOS, OW) having a thickness of 30 μm was prepared.
(Formation of pattern layer 70)
The pattern layer 70 is formed by printing a pattern on the surface 51 of the first base material layer 50.
(Formation of second base material layer 60)
An uncolored polypropylene film (manufactured by Prime Polymer Co., Ltd., CPS-DB) having a thickness of 80 μm was laminated on the upper layer of the pattern layer 70 as the second base material layer 60.

(Surface protection layer 80)
A thermosetting resin (UC clear manufactured by DIC Graphics Co., Ltd.) having a thickness of 3 μm is applied to the surface of the second base material layer 60 by gravure printing to form the surface protective layer 80.
At this time, a silver-based inorganic additive (Bioside TB-B100, manufactured by Taisho Technox Co., Ltd.) was blended in the surface protective layer 80 as an antiviral agent in a solid content ratio of 0.2% by mass.
The antiviral agent has a structure in which silver ions are supported on an inorganic material. The average particle size (Φ) of the antiviral agent was set to 5 μm. At this time, the first peak of the particle size of the antiviral agent was set to 3 μm, and the second peak was set to 7 μm. The average particle size (Φ) of the antiviral agent with respect to the thickness D (3 μm in this example) of the outermost layer (first surface protective layer) of the surface protective layer was set to 1.67D. As a result, the extensibility film layer 20 was produced.

(Formation of Adhesive Layer 30)
Subsequently, an acrylic pressure-sensitive adhesive (Toyo Ink Mfg. Co., Ltd., BPS6113) is applied and dried on the back surface 22 of the extensibility film layer 20 by a coating machine to form the pressure-sensitive adhesive layer 30.
The thickness of the thickest part of the pressure-sensitive adhesive layer 30 after drying was set to 10 μm.
(Formation of removable sheet 40)
Finally, as the peelable sheet 40, a laminated sheet having a thickness of 120 μm was prepared.
As the laminated sheet, a sheet (SHA80 manufactured by Sun A. Kaken Co., Ltd.) in which a peelable layer mainly composed of silicone resin was laminated on the upper layer of the polypropylene film layer and a paper layer was laminated on the lower layer of the polypropylene film layer was used. ..
From the above, the adhesive sheet 10 was manufactured.

(Multiple peaks of antiviral agents)
As shown in FIG. 2, when the particle size distribution of "Bioside TB-B100" exemplified as an antiviral agent has at least two peaks between less than 5 μm and 5 μm or more, it is used as it is.
On the other hand, when the particle size distribution of "Bioside TB-B100" does not have at least two peaks, one having an average particle size of 5 μm and one having an average particle size are finely pulverized or the average particle size and grains. The meshes having different diameters may be sifted and the extracted meshes having different particle sizes may be mixed.

As a result, the particle size distribution of the antiviral agent has at least two peaks between less than 5 μm and more than 5 μm, as shown in FIG.
For example, the "average particle size" of the "bioside TB-B100" measured using a particle size distribution meter was "6.86 μm". This is the first peak.
The second peak may be unique to the antiviral agent, or may be artificially provided with the second peak.
For example, the "bioside TB-B100" was finely pulverized to have an average particle size of 0.49 μm.

As a result, the average particle size of "6.86 μm" and the finely pulverized "average particle size of 0.49 μm" are mixed, for example, at a ratio of 1: 1 to obtain an average particle size of "6. The first peak with "86 μm" and the second peak with finely ground "average particle size of 0.49 μm" can be artificially created.
Further, not limited to fine pulverization, the above-mentioned "Bioside TB-B100" may be sieved with a 10 μm mesh exceeding the “average particle size”. Conversely, the mesh may be sieved with a mesh size of less than "average particle size", for example, less than "5.0 μm".

(Action / effect of the embodiment)
The actions and effects of the embodiments are as follows.
(1) The pressure-sensitive adhesive sheet 10 of the present embodiment contains an antiviral agent of 0.2% by mass or more and 20% by mass or less in the surface protective layer 80.
According to the above configuration, sufficient antiviral resistance and scratch resistance can be ensured on the product surface.
Further, in the pressure-sensitive adhesive sheet 10 of the present embodiment, the first base material layer 50 and the second base material layer 60 have transparency.
According to the above configuration, the design of the article to be attached can be retained.
Further, the surface protective layer 80 contains at least one of a thermosetting resin, an ultraviolet curable resin, and an electron beam curable resin.

According to the above configuration, while retaining the original design to be attached, the article has antiviral properties, or in addition to that, for example, flexibility (for example, proper processing), scratch resistance, bending processing, etc., depending on the application. Functionality can also be added.
The average particle size of the antiviral agent is 1 μm or more and 10 μm or less.
According to the above configuration, when the average particle size of the antiviral agent is 1 μm or more, the contact area between the surface protective layer 80 and the antiviral agent is improved, and the antiviral property is improved. When the average particle size of the antiviral agent is 10 μm or less, the scratch resistance is improved.

(2) The pressure-sensitive adhesive sheet 10 of the present embodiment includes a plurality of groove portions 90 formed on the surface side of the pressure-sensitive adhesive layer 30 opposite to the film layer 20.
According to the above configuration, when the pressure-sensitive adhesive sheet 10 is attached to the adherend, the air trapped between the pressure-sensitive adhesive layer 30 and the adherend can flow out to the surroundings. Then, after the air flows out to the surroundings, the bottom portion of the groove portion 90 is brought into close contact with the surface of the adherend, whereby the groove portion 90 can be eliminated. Further, by bringing the bottom of the groove 90 into close contact with the surface of the adherend, impact resistance and cold resistance can be improved.

(3) In the pressure-sensitive adhesive sheet 10 of the present embodiment, the antiviral agent is a silver-based material.
According to the above configuration, the silver-based antiviral agent is superior in terms of antiviral effect.
(4) The pressure-sensitive adhesive sheet 10 of the present embodiment has a pattern layer 70.
According to the above configuration, the surface layer side of the adhesive sheet 10 can be decorated with the pattern pattern of the pattern layer 70.
The pattern layer 70 is set so as not to interfere with the visual recognition of the design of the article to be attached.

(5) The pressure-sensitive adhesive sheet 10 of the present embodiment has a plurality of peaks of the particle size of the antiviral agent.
According to the above configuration, since a plurality of peaks of the particle size of the antiviral agent are present, the packing density of the antiviral agent can be further improved, and more antiviral agents can be added. Therefore, the contact area with the antiviral agent is expanded, and the surface area of the antiviral itself is also expanded, so that the antiviral property can be improved.

(6) The method for producing the pressure-sensitive adhesive sheet 10 of the present embodiment includes a transparent extensible film layer, a pressure-sensitive adhesive layer formed on one surface side of the extensible film layer, and the pressure-sensitive adhesive layer. It has a peelable sheet formed on the surface side opposite to the extensible film layer and a surface protective layer on the other surface side of the extensible film layer, and the surface protective layer is heat-cured in addition to an antiviral agent. It contains at least one of a sex resin, an ultraviolet curable resin, and an electron beam curable resin, and the amount of the antiviral agent added to the surface protective layer is 0.2% by mass or more and 20% by mass or less, and the antivirus. The average particle size of the agent is 1 μm or more and 10 μm or less. For the antiviral agent, one having an average particle size and one having an average particle size are finely pulverized or screened with a mesh having a particle size different from the average particle size. , The extracted ones with different particle sizes are mixed.
According to the above configuration, since a plurality of peaks of the particle size of the antiviral agent are present, the packing density of the antiviral agent can be further improved, and more antiviral agents can be added. Therefore, the contact area with the antiviral agent is expanded, and the surface area of the antiviral itself is also expanded, so that the antiviral property can be improved.

(Example 1)
In Example 1, first, an uncolored polypropylene film (manufactured by RIKEN TECHNOS, OW) having a thickness of 30 μm was prepared as the first base material layer.
Subsequently, an 80 μm-thick uncolored polypropylene film (CPS-DB, manufactured by Prime Polymer Co., Ltd.) was laminated on the upper layer of the pattern layer as a second base material layer.
A thermosetting resin (UC clear manufactured by DIC Graphics Corporation) was applied to the surface of the second base material layer by gravure printing to a thickness of 3 μm to form a surface protective layer.
At this time, a silver-based inorganic additive (Bioside TB-B100, manufactured by Taisho Technox Co., Ltd.) was blended in the surface protective layer as an antiviral agent in a solid content ratio of 0.2% by mass.

The antiviral agent has a structure in which silver ions are supported on an inorganic material.
The average particle size (Φ) of the antiviral agent was set to 5 μm.
At this time, the first peak of the particle size of the antiviral agent was set to 3 μm, and the second peak was set to 7 μm.
Further, the average particle size (Φ) of the antiviral agent with respect to the thickness D (3 μm in this example) of the outermost layer (first surface protective layer) of the surface protective layer was set to 1.67D. As a result, an extensible film layer was produced.

Subsequently, an acrylic pressure-sensitive adhesive (Toyo Ink Mfg. Co., Ltd., BPS6113) was applied and dried on the back surface of the extensibility film layer by a coating machine to form an adhesive layer. The thickness of the thickest part of the pressure-sensitive adhesive layer after drying was 10 μm.
Finally, as a peelable sheet, a laminated sheet having a thickness of 120 μm was prepared. As the laminated sheet, a sheet (SHA80 manufactured by Sun A. Kaken Co., Ltd.) in which a peelable layer mainly composed of silicone resin was laminated on the upper layer of the polypropylene film layer and a paper layer was laminated on the lower layer of the polypropylene film layer was used. ..
From the above, the pressure-sensitive adhesive sheet of Example 1 was prepared.

(Example 2)
In Example 2, the amount of the antiviral agent added was changed to 7% by mass. The pressure-sensitive adhesive sheet of Example 2 was prepared in the same manner as in Example 1 except for the above.
(Example 3)
In Example 3, the main component of the surface protective layer was changed to an ultraviolet curable resin (urethane acrylate resin manufactured by DIC Graphics Corporation). Moreover, the thickness of the surface protective layer was changed to 6 μm. The pressure-sensitive adhesive sheet of Example 3 was prepared in the same manner as in Example 2 except for the above.

(Example 4)
In Example 4, the main component of the outermost layer (first surface protective layer) of the surface protective layer was changed to an electron beam curable resin. The pressure-sensitive adhesive sheet of Example 4 was prepared in the same manner as in Example 2 except for the above.
(Example 5)
In Example 5, the amount of the antiviral agent added was changed to 10% by mass. The pressure-sensitive adhesive sheet of Example 5 was prepared in the same manner as in Example 1 except for the above.

(Example 6)
In Example 6, the average particle size (Φ) of the antiviral agent was changed to 1 μm. The pressure-sensitive adhesive sheet of Example 6 was prepared in the same manner as in Example 2 except for the above.
(Example 7)
In Example 7, the average particle size (Φ) of the antiviral agent was changed to 10 μm. The pressure-sensitive adhesive sheet of Example 7 was prepared in the same manner as in Example 2 except for the above.

(Example 8)
In Example 8, the second peak of the particle size of the antiviral agent was changed to 0.1 μm. The pressure-sensitive adhesive sheet of Example 8 was prepared in the same manner as in Example 2 except for the above.
(Example 9)
In Example 9, the second peak of the particle size of the antiviral agent was changed to 1 μm. The pressure-sensitive adhesive sheet of Example 9 was prepared in the same manner as in Example 2 except for the above.

(Example 10)
In Example 10, the second peak of the particle size of the antiviral agent was changed to 5 μm. The pressure-sensitive adhesive sheet of Example 10 was prepared in the same manner as in Example 2 except for the above.
(Example 11)
In Example 11, the second peak of the particle size of the antiviral agent was changed to 6 μm. The pressure-sensitive adhesive sheet of Example 11 was prepared in the same manner as in Example 2 except for the above.

(Example 12)
In Example 12, the amount of the antiviral agent added was changed to 4% by mass. The pressure-sensitive adhesive sheet of Example 12 was prepared in the same manner as in Example 2 except for the above.
(Example 13)
In Example 13, the amount of the antiviral agent added was changed to 5% by mass. The pressure-sensitive adhesive sheet of Example 13 was prepared in the same manner as in Example 2 except for the above.

(Example 14)
In Example 14, the amount of the antiviral agent added was changed to 10% by mass. The pressure-sensitive adhesive sheet of Example 14 was prepared in the same manner as in Example 2 except for the above.
(Example 15)
In Example 15, the amount of the antiviral agent added was changed to 20% by mass. The pressure-sensitive adhesive sheet of Example 15 was prepared in the same manner as in Example 2 except for the above.

(Example 16)
In Example 16, the second peak of the particle size of the antiviral agent was changed to 0.1 μm, and the amount of the antiviral agent added was changed to 4% by mass. The pressure-sensitive adhesive sheet of Example 16 was prepared in the same manner as in Example 2 except for the above.
(Example 17)
In Example 17, the second peak of the particle size of the antiviral agent was changed to 10 μm, and the amount of the antiviral agent added was changed to 20% by mass. The pressure-sensitive adhesive sheet of Example 17 was prepared in the same manner as in Example 2 except for the above.

(Example 18)
In Example 18, the thickness of the surface protective layer was changed to 2 μm. The pressure-sensitive adhesive sheet of Example 18 was prepared in the same manner as in Example 2 except for the above.
(Example 19)
In Example 19, the resin material was changed to "thermosetting resin". The pressure-sensitive adhesive sheet of Example 19 was prepared in the same manner as in Example 2 except for the above.

(Example 20)
In Example 20, the thickness of the surface protective layer was changed to 15 μm. The pressure-sensitive adhesive sheet of Example 20 was prepared in the same manner as in Example 2 except for the above.
(Example 21)
In Example 21, the thickness of the surface protective layer was changed to 25 μm. The pressure-sensitive adhesive sheet of Example 21 was prepared in the same manner as in Example 2 except for the above.

(Comparative Example 1)
In Comparative Example 1, the addition of the antiviral agent was omitted in the surface protective layer. A pressure-sensitive adhesive sheet of Comparative Example 1 was prepared in the same manner as in Example 28 except for the above.
(Comparative Example 2)
In Comparative Example 2, the amount of the antiviral agent added was changed to 0.1% by mass. A pressure-sensitive adhesive sheet of Comparative Example 2 was prepared in the same manner as in Example 1 except for the above.

(Comparative Example 3)
In Comparative Example 3, the average particle size (Φ) of the antiviral agent was changed to 0.5 μm. A pressure-sensitive adhesive sheet of Comparative Example 3 was prepared in the same manner as in Example 2 except for the above.
(Comparative Example 4)
In Comparative Example 4, the average particle size (Φ) of the antiviral agent was changed to 13 μm. A pressure-sensitive adhesive sheet of Comparative Example 4 was prepared in the same manner as in Example 2 except for the above.

(Comparative Example 5)
In Comparative Example 5, the first base material layer 50 was changed from a colored polypropylene film, that is, "transparent" to "colored". A pressure-sensitive adhesive sheet of Comparative Example 5 was prepared in the same manner as in Example 2 except for the above.
(Comparative Example 6)
In Comparative Example 6, the amount of the antiviral agent added was changed to 14% by mass. A pressure-sensitive adhesive sheet of Comparative Example 6 was prepared in the same manner as in Example 1 except for the above.

(Evaluation judgment)
The antiviral performance and bending workability of the adhesive sheets obtained in Examples 1 to 21 and Comparative Examples 1 to 6 described above were evaluated by the following methods.
(Antiviral performance)
The adhesive sheets of Examples 1 to 21 and Comparative Examples 1 to 6 were subjected to an antiviral test according to ISO 21702. A 50 mm square test sample was placed in a sterile petri dish and 0.4 mL of virus solution was inoculated onto the sample. At this time, as the virus solution, a virus solution containing Emperobe virus (influenza virus) was used. Then, a 40 mm square polyethylene film was put on the sample. After the petri dish was covered, the sample and virus were inoculated under the conditions of a temperature of 25 ° C. and a humidity of 90% or more. After a predetermined time (24 hours), 10 mL of SCDLP medium was poured into a petri dish to wash out the virus. The virus infectivity titer of the washout solution was measured by the plaque method.

(Measurement of viral load (plaque method))
The host cells were monolayer-cultured on a 6-well plate, and 0.1 mL each of the washout solution diluted stepwise was inoculated into the wells. The cells were cultured for 1 hour under the conditions of 5% CO ² and a temperature of 37 ° C., and after adsorbing the virus on the cells, an agar medium was poured into a 6-well plate and cultured for another 2 to 3 days. After culturing, the cells were fixed and stained, and the number of plaques formed was counted.
(Calculation of viral load)
The virus infectivity titer per 1 cm ^{2 of the sample was calculated according to the following formula.}
V = (10 x C x D x N) / A
V: Virus infectivity titer per ^{1 cm 2 sample (PFU / cm 2} )
C: Number of plaques measured D: Dilution ratio of wells where plaques were measured N: Amount of SCDLP A: Contact area between sample and virus (polyethylene film area)

(Calculation of antiviral activity value)
The antiviral activity value was calculated according to the following formula. Here, when the antiviral activity value is 2 log 10 or more, it is determined that there is an antiviral effect.
Antiviral activity value = log (Vb) -log (Vc)
Log (Vb): 24 hours after non-processed sample 1 cm ² per viral infectivity of common logarithm value Log (Vc): 24 hours after anti antiviral processed sample 1 cm ² were common logarithm value calculated for viral infectivity per The virus activity value was evaluated on the following four levels of "◎", "○", and "×".
(Evaluation criteria)
⊚: When the antiviral activity value is 3log10 or more ○: When the antiviral activity value is 2log10 or more ×: When the antiviral activity value is less than 2log10

(Bending workability)
A two-component water-based emulsion adhesive (“Ricabond” manufactured by Chuo Rika Kogyo Co., Ltd. (weight ratio BA-10L / BA-11B = 100: 2) on the surface of MDF (hardwood) with a thickness of 3 mm, which is the base material for fittings. .5)) was applied to 100 g / m ² in a wet state, and then the adhesive sheets of Examples 1 to 21 and Comparative Examples 1 to 6 were attached and cured for 24 hours. The fitting decorative materials of Examples 1 to 21 and Comparative Examples 1 to 6 were used.
V-cut processing was performed on these fitting decorative materials, and the appearance state was confirmed by visually confirming the top of the bent top. As the V-cut processing, a V-shaped groove is formed so that the adhesive sheet is not scratched from the side of the joinery decorative material where the adhesive sheet is not attached to the boundary where the adhesive sheet is attached to the joinery base material. I put it in. Next, the fitting base material was bent up to 90 degrees along the V-shaped groove so that the surface to which the adhesive sheet 1 was attached was folded in a mountain fold.

(Evaluation criteria)
⊚: There is no cracking or whitening of the surface protective layer on the top of the bend.
〇: There is almost no cracking or whitening of the surface protection layer at the top of the bend.
Δ: Only a part of the surface protective layer was cracked or whitened at the top of the bend.
X: Cracking and whitening of the surface protective layer occurred at the top of the bend.
The above evaluation results are shown in Table 1.

(Lower pattern visibility evaluation)
The test piece was attached to a transparent acrylic plate having a thickness of 1 mm, and then placed on a JIS A6921 concealing gray scale. Immediately after that, it was confirmed whether the pattern could be visually recognized under a D65 light source, and the evaluation was made on a 4-point scale.
◎: Not visible at all 〇: Almost invisible △: Slightly visible ×: Visible

The above results are shown in Table 1.

As shown in Table 1, from the evaluation results of Examples 1 to 21, Comparative Example 1 and Comparative Example 2, the amount of the antiviral agent added was 0.2 as in Examples 1 to 21. It was found that when the mass was more than 0.2% by mass, the antiviral property was higher than when the amount of the antiviral agent added was less than 0.2% by mass as in Comparative Example 1 and Comparative Example 2.
Further, from the evaluation results of Examples 1 to 21, Comparative Example 3, Comparative Example 4 and Comparative Example 5, the average particle size (Φ) of the antiviral agent was 1 μm or more and 10 μm as in Examples 1 to 21. In the following cases, it was found that the antiviral property was higher than that in the case where the average particle size (Φ) of the antiviral agent was less than 1 μm and exceeded 10 μm as in Comparative Example 3.

Then, from the evaluation results of Example 2 and Comparative Example 5, it was found that when the transparent base material layer was used, the design to be attached could be sufficiently visually recognized with the above layer structure. That is, in Comparative Example 5, while the other Examples 1 to 21, Comparative Examples 1 to 4, and Comparative Example 5 were "transparent", they were changed to "coloring" only.
On the other hand, as for the resin material, Examples 1, Example 2, Examples 5 to 21, and Comparative Examples 1 to 6 use "thermosetting resin", and Example 3 is "ultraviolet curable type". , And the resin of "electron beam curable type" in Example 4 is used.
The pressure-sensitive adhesive sheet of the present invention is not limited to the above-described embodiments and examples, and various modifications can be made as long as the characteristics of the present invention are not impaired.

10 Adhesive sheet 20 Stretchable film layer 21 Front surface 22 Back surface 30 Adhesive layer 31 Back surface 40 Detachable sheet 41 Adjacent surface 50 First base material layer 51 Surface 60 Second base material layer 70 Picture layer 80 Surface protection layer 90 Groove 100 Printing Resin film

Claims (5)

A transparent extensible film layer, a pressure-sensitive adhesive layer formed on one surface side of the extensible film layer, and a peelability formed on the surface side of the pressure-sensitive adhesive layer opposite to the extensible film layer. It has a sheet and a surface protective layer on the other surface side of the extensibility film layer, and the surface protective layer is a thermosetting resin, an ultraviolet curable resin, or an electron beam curable resin in addition to an antiviral agent. The amount of the antiviral agent added to the surface protective layer is 0.2% by mass or more and 20% by mass or less, and the average particle size of the antiviral agent is 1 μm or more and 10 μm or less.
An adhesive sheet characterized in that a plurality of peaks of the particle size of the antiviral agent are present. The pressure-sensitive adhesive sheet according to claim 1, further comprising a plurality of grooves formed on the surface side of the pressure-sensitive adhesive layer opposite to the extensible film layer. The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the antiviral agent is a silver-based material. The adhesive sheet according to any one of claims 1 to 3, wherein the extensibility film layer has a pattern layer. A transparent extensible film layer, a pressure-sensitive adhesive layer formed on one surface side of the extensible film layer, and a peelability formed on the surface side of the pressure-sensitive adhesive layer opposite to the extensible film layer. It has a sheet and a surface protective layer on the other surface side of the extensibility film layer, and the surface protective layer is a thermosetting resin, an ultraviolet curable resin, or an electron beam curable resin in addition to an antiviral agent. The amount of the antiviral agent added to the surface protective layer is 0.2% by mass or more and 20% by mass or less, and the average particle size of the antiviral agent is 1 μm or more and 10 μm or less.
The antiviral agent includes
With average particle size
A method for producing an adhesive sheet, which comprises finely pulverizing a material having an average particle size or sieving a mesh having a particle size different from the average particle size, and mixing the extracted materials having a different particle size.

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