JP2020007511A - Adhesive sheet and anti-glare sheet - Google Patents

Abstract

To provide an adhesive sheet that enables the production of an anti-glare sheet that exhibits excellent anti-glare property and yet further suppresses the occurrence of glare and brownish whitening.SOLUTION: Provided is an adhesive sheet 1 including an adhesive agent layer 11, the adhesive agent layer 11 being formed of an adhesive agent composition containing a (meth)acrylic acid ester polymer that contains (meth)acrylic acid fluoro-alkyl ester as a monomer unit constituting the polymer, and light diffusing fine particles, and the haze value of the adhesive agent layer 11 being 10% or more and 90% or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure-sensitive adhesive sheet that can be suitably used for producing an antiglare sheet.

  In a display such as a liquid crystal display or an organic EL display, light is incident on the screen from the outside, and this light is reflected to make it difficult to view a displayed image. Especially for displays for vehicles and mobile devices, the effect of external light is greater than for conventional indoor displays, and it is important to solve the problem that light is reflected and makes it difficult to see the displayed image. Is coming.

  In order to solve the above-mentioned problem, various anti-glare treatments have been applied to various displays. As one of them, an anti-glare sheet having unevenness formed on the surface is laminated on the surface of a display, and the anti-glare property is exhibited by the unevenness.

  Patent Document 1 discloses an example of the above-described antiglare sheet. In particular, the antiglare sheet disclosed in Patent Document 1 is provided with a layer in which resin fine particles are dispersed in a light-transmitting resin. It is formed in.

  However, in the case of using an anti-glare sheet in which surface irregularities are formed by fine particles as disclosed in Patent Document 1, scattering of image light occurs due to the fine particles, and the portion is glaring. A so-called "glitter" that shines may occur. This tendency becomes more remarkable as the particle size of the fine particles used for forming the surface irregularities increases.

  On the other hand, glare can be reduced to some extent by increasing the haze value of the antiglare sheet. However, when the haze value of the antiglare sheet is increased, the sheet becomes whitish, which causes a new problem of so-called "white-washing".

  In Patent Document 2, in order to simultaneously eliminate such “glare” and “white tea”, light diffusion is performed on an antiglare layer that exhibits antiglare properties by containing fine particles for forming surface irregularities. It has been proposed to combine pressure-sensitive adhesive layers with properties, with some success. That is, according to the pressure-sensitive adhesive sheet disclosed in Patent Literature 2, "glare" and "white-wash" can be simultaneously eliminated while having antiglare properties.

JP 2010-102072 A JP-A-2017-66329

  Certainly, as described above, according to the pressure-sensitive adhesive sheet disclosed in Patent Literature 2, both "glare" and "white tea" can be eliminated to some extent simultaneously. However, the trend toward higher definition of displays is unavoidable, and furthermore, it is required to simultaneously eliminate both "glare" and "white tea" at a high level.

  The present invention has been made in view of such circumstances, and while exhibiting excellent anti-glare properties, an adhesive that enables the production of an anti-glare sheet in which the occurrence of glare and discoloration is further suppressed. The purpose is to provide a sheet.

  In order to achieve the above object, first, the present invention relates to a pressure-sensitive adhesive sheet provided with a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer contains a fluoroalkyl (meth) acrylate as a monomer unit constituting a polymer. It is formed from a pressure-sensitive adhesive composition containing a (meth) acrylate polymer and light-diffusing fine particles, and the haze value of the pressure-sensitive adhesive layer is 10% or more and 90% or less. (Invention 1).

  In the pressure-sensitive adhesive sheet according to the above invention (Invention 1), a predetermined light-diffusing property can be achieved because the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing light-diffusing fine particles. Thereby, the anti-glare sheet manufactured using the pressure-sensitive adhesive sheet achieves good anti-glare properties, but also suppresses the occurrence of glare. Furthermore, the above-mentioned pressure-sensitive adhesive composition contains a (meth) acrylic acid ester polymer containing a (meth) acrylic acid fluoroalkyl ester as a monomer unit constituting the polymer, thereby forming a pressure-sensitive adhesive. The layer will have a relatively low refractive index. In the pressure-sensitive adhesive layer, the difference in the refractive index between the (meth) acrylate polymer and the light diffusing fine particles can be easily adjusted to a relatively small value. As a result, the anti-glare sheet manufactured using the above-mentioned pressure-sensitive adhesive sheet can favorably suppress the occurrence of white tint.

  In the above invention (Invention 1), the difference in the refractive index between the (meth) acrylate polymer and the light diffusing fine particles is preferably 0.01 or more and 0.05 or less (Invention 2).

  In the above inventions (Inventions 1 and 2), the (meth) acrylate polymer preferably has a refractive index of 1.42 or more and 1.47 or less (Invention 3).

  In the above inventions (Inventions 1 to 3), the light diffusing fine particles preferably have a refractive index of 1.40 or more and 1.46 or less (Invention 4).

  In the above inventions (Inventions 1 to 4), the (meth) acrylic acid ester polymer contains 5% by mass or more and 90% by mass of the (meth) acrylic acid fluoroalkyl ester as a monomer unit constituting the polymer. It is preferable to contain the following (invention 5).

  In the above inventions (Inventions 1 to 5), the pressure-sensitive adhesive composition preferably contains a crosslinking agent (Invention 6).

  In the above inventions (Inventions 1 to 6), the pressure-sensitive adhesive composition preferably contains an active energy ray-curable component (Invention 7).

  Secondly, the present invention provides a base material, an anti-glare layer provided on one surface side of the base material, and an anti-glare property provided with an adhesive layer provided on the other surface side of the base material. A sheet, wherein the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet (Inventions 1 to 7), and the anti-glare layer contains fine particles for forming surface irregularities. A sheet is provided (Invention 8).

  ADVANTAGE OF THE INVENTION According to the pressure sensitive adhesive sheet which concerns on this invention, the glare-proof sheet | seat which suppressed the generation | occurrence | production of glare and white-washing can be manufactured, exhibiting excellent anti-glare property.

It is a sectional view of an adhesive sheet concerning one embodiment of the present invention. It is a sectional view of an example of an anti-glare sheet manufactured using an adhesive sheet concerning one embodiment of the present invention.

Hereinafter, the pressure-sensitive adhesive sheet according to the embodiment of the present invention will be described.
FIG. 1 is a cross-sectional view of the pressure-sensitive adhesive sheet according to one embodiment of the present invention. As shown in FIG. 1, the pressure-sensitive adhesive sheet 1 according to the present embodiment includes a pressure-sensitive adhesive layer 11 and two release sheets 12 provided on both surfaces of the pressure-sensitive adhesive layer 11, respectively. The pressure-sensitive adhesive layer 11 contains light diffusing fine particles 111. Here, the release sheet 12 is not an essential component in the pressure-sensitive adhesive sheet 1 and is peeled and removed when the pressure-sensitive adhesive sheet 1 is used.

1. Each member (1) pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive sheet The pressure-sensitive adhesive layer 11 in the present embodiment includes (meth) acrylic acid ester poly (meth) acrylate containing a fluoroalkyl (meth) acrylate as a monomer unit constituting the polymer. It is formed from a pressure-sensitive adhesive composition containing the coalesced particles and the light diffusing fine particles 111. In the pressure-sensitive adhesive sheet 1 according to the present embodiment, since the pressure-sensitive adhesive layer 11 contains the light diffusing fine particles 111, the pressure-sensitive adhesive layer 11 has a haze value in a range described later. Thereby, in the antiglare sheet manufactured using the pressure-sensitive adhesive sheet 1 according to the present embodiment, it is possible to favorably suppress the occurrence of glare.

  In addition, in this specification, a (meth) acrylic ester means both an acrylic ester and a methacrylic ester. The same applies to other similar terms. The term “polymer” also includes the concept of “copolymer”.

(1-1) (Meth) acrylic acid ester polymer The (meth) acrylic acid ester polymer in the present embodiment contains (meth) acrylic acid fluoroalkyl ester as a monomer unit constituting the polymer. A (meth) acrylic acid ester polymer containing a (meth) acrylic acid fluoroalkyl ester tends to have a smaller refractive index than a (meth) acrylic acid ester polymer not containing the monomer. Therefore, in the pressure-sensitive adhesive layer 11 of the present embodiment, the refractive index of the pressure-sensitive adhesive layer 11 is relatively low, and the difference in the refractive index between the (meth) acrylate polymer and the light diffusing fine particles is relatively small. Value (but not “0”). As a result, in the anti-glare sheet manufactured by using the pressure-sensitive adhesive sheet 1 according to the present embodiment, the occurrence of white tint is favorably suppressed. The method for measuring the refractive index of the (meth) acrylic acid ester polymer is as described in the Examples section described later.

  The fluoroalkyl (meth) acrylate described above is not particularly limited as long as it has a fluoro group in the molecule, and examples thereof include 2,2,2-trifluoroethyl (meth) acrylate and (meth) acrylic acid. 2,2,2,3-tetrafluoropropyl acid, 1H, 1H, 5H-octafluoropentyl (meth) acrylate, 1H, 1H, 2H, 2H-tridecafluorooctyl (meth) acrylate and the like. Among these, 2,2,2-trifluoroethyl acrylate and 2,2,2,3-acrylic acid from the viewpoint that the refractive index of the (meth) acrylic acid ester polymer can be easily adjusted to a relatively small value. It is preferred to use at least one of tetrafluoropropyl. The fluoroalkyl (meth) acrylate may be used alone, or two or more kinds may be used in combination.

  The (meth) acrylic acid ester polymer preferably contains 5% by mass or more of (meth) acrylic acid fluoroalkyl ester as a monomer unit constituting the polymer, and particularly preferably 25% by mass or more. And more preferably 40% by mass or more. The (meth) acrylate polymer preferably contains the fluoroalkyl (meth) acrylate in an amount of 90% by mass or less, particularly preferably 75% by mass or less, and further preferably 60% by mass. It is preferable to contain the following. When the content of the (meth) acrylic acid fluoroalkyl ester is 5% by mass or more, the refractive index of the (meth) acrylic acid ester polymer is easily reduced, whereby the resulting anti-glare sheet has a white tint. Can be effectively suppressed. Further, when the content of the fluoroalkyl (meth) acrylate is 90% by mass or less, the content of other monomer units can be sufficiently ensured, and the pressure-sensitive adhesive layer 11 having desired characteristics can be formed. Easier to do.

  The (meth) acrylate polymer in the present embodiment preferably contains, as a monomer constituting the polymer, an alkyl (meth) acrylate having an alkyl group having 1 to 20 carbon atoms. As a result, the obtained pressure-sensitive adhesive can exhibit favorable tackiness.

  Examples of the alkyl (meth) acrylate having 1 to 20 carbon atoms in the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and n- (meth) acrylate. Butyl, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-decyl (meth) acrylate, (meth) acrylic acid n-dodecyl, myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate and the like. Above all, from the viewpoint of further improving the adhesiveness, (meth) acrylate having 1 to 8 carbon atoms in the alkyl group is preferable, and methyl (meth) acrylate, n-butyl (meth) acrylate and (meth) acryl are preferred. 2-Ethylhexyl acid is particularly preferred. Further, among these, it is preferable to use n-butyl acrylate. The above-mentioned alkyl (meth) acrylate may be used alone or in combination of two or more.

  The (meth) acrylate polymer preferably contains, as a monomer unit constituting the polymer, an alkyl (meth) acrylate having an alkyl group having 1 to 20 carbon atoms of 5% by mass or more, particularly preferably 5% by mass or more. The content is preferably 15% by mass or more, more preferably 30% by mass or more. Further, the (meth) acrylic acid ester polymer preferably contains 90% by mass or less, particularly preferably 70% by mass or less, of an alkyl (meth) acrylate having 1 to 20 carbon atoms in the alkyl group. And more preferably 50% by mass or less.

  It is also preferable that the (meth) acrylate polymer in the present embodiment contains a monomer having a reactive functional group (reactive functional group-containing monomer) as a monomer unit constituting the polymer. When the (meth) acrylate polymer contains the reactive functional group-containing monomer, the polymer easily reacts with a crosslinking agent described later to form a crosslinked structure.

  Examples of the reactive functional group-containing monomer include a monomer having a carboxy group in the molecule (carboxy group-containing monomer), a monomer having a hydroxy group in the molecule (hydroxy group-containing monomer), and a monomer having an amino group in the molecule (amino A carboxy group-containing monomer or a hydroxy group-containing monomer is preferable, and a carboxy group-containing monomer is more preferable. One of these reactive functional group-containing monomers may be used alone, or two or more thereof may be used in combination.

  Examples of the carboxy group-containing monomer include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid and citraconic acid. Above all, acrylic acid is preferred from the viewpoint of the reactivity of the obtained (meth) acrylate polymer with the crosslinking agent of the carboxy group and the copolymerizability with other monomers. These may be used alone or in combination of two or more.

  Examples of the hydroxy-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and (meth) acrylate. ) Hydroxyalkyl (meth) acrylates such as 3-hydroxybutyl acrylate and 4-hydroxybutyl (meth) acrylate. These may be used alone or in combination of two or more.

  Examples of the amino group-containing monomer include aminoethyl (meth) acrylate, n-butylaminoethyl (meth) acrylate, and the like. These may be used alone or in combination of two or more.

  The (meth) acrylic acid ester polymer preferably contains a reactive functional group-containing monomer in an amount of 1% by mass or more, particularly preferably 7% by mass or more, as a monomer unit constituting the polymer. Is preferably contained by 10% by mass or more. Further, the (meth) acrylic acid ester polymer preferably contains the reactive functional group-containing monomer at 30% by mass or less, particularly preferably 20% by mass or less, and more preferably 15% by mass or less. It is preferred to contain.

  The (meth) acrylate polymer in the present embodiment may further contain another monomer as a monomer constituting the polymer. Examples of the other monomer include dicyclopentanyl (meth) acrylate, adamantyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and dicyclopentenyl (meth) acrylate. Non-crosslinking of alicyclic structure-containing (meth) acrylates such as oxyethyl, methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, etc., alkoxyalkyl (meth) acrylates, acrylamide, methacrylamide, etc. (Meth) acrylates having a non-crosslinkable tertiary amino group such as non-crosslinkable acrylamide, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, vinyl acetate , Styrene and the like. These may be used alone or in combination of two or more.

  The polymerization mode of the (meth) acrylate polymer in the present embodiment may be a random copolymer or a block copolymer.

  The refractive index of the (meth) acrylic acid ester polymer in the present embodiment is preferably 1.47 or less, particularly preferably 1.46 or less, and further preferably 1.45 or less. When the refractive index of the (meth) acrylic acid ester polymer is 1.47 or less, it is possible to effectively suppress the occurrence of white tint in the produced antiglare sheet. In addition, the refractive index of the (meth) acrylate polymer is preferably 1.42 or more, particularly preferably 1.43 or more, and further preferably 1.44 or more. When the refractive index of the (meth) acrylate polymer is 1.42 or more, the (meth) acrylate polymer and the light diffusing fine particles 111 easily have a predetermined difference in refractive index. Thereby, the pressure-sensitive adhesive layer 11 tends to have a predetermined haze value, and as a result, it is possible to effectively suppress the occurrence of glare in the manufactured antiglare sheet.

  The weight average molecular weight of the (meth) acrylic acid ester polymer in the present embodiment is preferably 100,000 or more, particularly preferably 300,000 or more, and more preferably 400,000 or more. Further, the weight average molecular weight is preferably 2,000,000 or less, particularly preferably 1.4 million or less, and further preferably 900,000 or less. When the weight-average molecular weight is 100,000 or more, floating or the like at the end of the pressure-sensitive adhesive layer 11 is effectively suppressed even when exposed to a high-temperature condition or a warm-humidity condition for a long time. On the other hand, when the weight average molecular weight is 2,000,000 or less, the viscosity of the coating liquid containing the polymer can be easily adjusted to be applicable, and the dispersibility of the light diffusing fine particles 111 is excellent. The weight average molecular weight in the present specification is a value in terms of standard polystyrene measured by a gel permeation chromatography (GPC) method.

  In the pressure-sensitive adhesive composition of the present embodiment, one type of the (meth) acrylate polymer may be used alone, or two or more types may be used in combination.

(1-2) Light-Diffusing Fine Particles The light-diffusing fine particles 111 in the present embodiment are not particularly limited as long as light-diffusing properties can be imparted to the pressure-sensitive adhesive layer 11. Further, it is preferable that the light diffusing fine particles 111 have a relatively small difference in refractive index from the above-mentioned (meth) acrylate polymer.

  The refractive index of the light diffusing fine particles 111 is preferably 1.40 or more, more preferably 1.41 or more, and further preferably 1.42 or more. In addition, the refractive index is preferably 1.46 or less, particularly preferably 1.45 or less, and further preferably 1.44 or less. When the refractive index of the light diffusing fine particles 111 is in the above-described range, the refractive index difference between the (meth) acrylate polymer and the light diffusing fine particles 111 is adjusted to a relatively small value (particularly, the range described below). It will be easier.

  The difference in the refractive index between the (meth) acrylate polymer and the light diffusing fine particles 111 is preferably 0.05 or less, particularly preferably 0.04 or less, and more preferably 0.03 or less. It is preferred that When the difference between the refractive indices is 0.05 or less, it is possible to effectively suppress the occurrence of white tint in the manufactured antiglare sheet. Further, the difference in the refractive index described above is preferably 0.01 or more, and particularly preferably 0.02 or more. When the difference in the refractive index is 0.01 or more, it is possible to effectively suppress the occurrence of glare in the manufactured antiglare sheet.

  Examples of the light diffusing fine particles 111 include inorganic fine particles such as silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay, talc, and titanium dioxide; and organic fine particles such as acrylic resin, polystyrene resin, polyethylene resin, and epoxy resin. Transparent fine particles; fine particles made of a silicon-containing compound having an intermediate structure between inorganic and organic (for example, Tospearl series manufactured by Momentive Performance Materials Japan, which are fine particles of silicone resin). Among these, fine particles made of a silicon-containing compound having an intermediate structure between inorganic and organic are preferable from the viewpoint of the glare suppressing effect. In addition, the fine particles exert their effects even when added in a small amount, and are also preferable from the viewpoint of maintaining good adhesiveness of the adhesive component. The light diffusing fine particles 111 may be used alone or in a combination of two or more.

  Examples of the acrylic resin fine particles include those made of a homopolymer of methyl methacrylate or a copolymer of methyl methacrylate and a monomer such as vinyl acetate, styrene, methyl acrylate, and ethyl (meth) acrylate. No.

  The shape of the light diffusing fine particles 111 may be a fixed shape such as a spherical shape or an irregular shape whose shape is not specified, but a spherical fine particle having a uniform light diffusion is preferable.

  The average particle size of the light diffusing fine particles 111 measured by a centrifugal sedimentation light transmission method is preferably 0.8 μm or more, particularly preferably 1 μm or more, further preferably 3 μm or more, and further preferably 4 μm or more. Most preferably. Further, the average particle size is preferably 20 μm or less, particularly preferably 10 μm or less, and further preferably 8 μm or less. When the average particle size of the light diffusing fine particles 111 is in the above range, the haze value of the pressure-sensitive adhesive sheet 1 can be easily set in the range described later, and the occurrence of glare can be effectively suppressed.

  The average particle size as measured by the centrifugal sedimentation light transmission method in this specification is obtained by sufficiently stirring 1.2 g of fine particles and 98.8 g of isopropyl alcohol as a measurement sample, and using a centrifugal automatic particle size distribution analyzer (Horiba Seisakusho) And "CAPA-700" (product name).

  The content of the light diffusing fine particles 111 in the above-mentioned pressure-sensitive adhesive composition is preferably at least 0.5 part by mass, particularly preferably 3 parts by mass, based on 100 parts by mass of the (meth) acrylate polymer. The amount is preferably not less than 7, more preferably not less than 7 parts by mass. Further, the content is preferably 30 parts by mass or less, more preferably 17 parts by mass or less, and further preferably 12 parts by mass or less, based on 100 parts by mass of the (meth) acrylate polymer. Preferably, there is. When the content of the light-diffusing fine particles 111 in the pressure-sensitive adhesive composition is 0.5 parts by mass or more, the haze value of the pressure-sensitive adhesive layer 11 becomes relatively large, whereby the produced antiglare sheet The generation of glare can be effectively suppressed. Further, when the content of the light diffusing fine particles 111 in the pressure-sensitive adhesive composition is 30 parts by mass or less, a decrease in the cohesive force of the pressure-sensitive adhesive formed from the pressure-sensitive adhesive composition is suppressed, and the pressure-sensitive adhesive sheet 1 has a desired pressure. It becomes easier to exhibit adhesive strength.

(1-3) Crosslinking Agent The pressure-sensitive adhesive composition in the present embodiment preferably contains a crosslinking agent. When the (meth) acrylic acid ester polymer contains the reactive functional group-containing monomer as a monomer unit constituting the polymer, the reactive functional group of the reactive functional group-containing monomer is crosslinked. React with the agent. Thereby, a structure in which the (meth) acrylate polymer is cross-linked by the cross-linking agent is formed in the formed pressure-sensitive adhesive layer 11, and the cohesive force of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 11 is improved. Become.

  The crosslinking agent may be any as long as it reacts with the reactive functional group of the (meth) acrylic acid ester polymer. For example, an isocyanate crosslinking agent, an epoxy crosslinking agent, an amine crosslinking agent, a melamine crosslinking agent, Examples include aziridine-based crosslinking agents, hydrazine-based crosslinking agents, aldehyde-based crosslinking agents, oxazoline-based crosslinking agents, metal alkoxide-based crosslinking agents, metal chelate-based crosslinking agents, metal salt-based crosslinking agents, and ammonium salt-based crosslinking agents. In addition, a crosslinking agent can be used individually by 1 type or in combination of 2 or more types.

  The isocyanate-based crosslinking agent contains at least a polyisocyanate compound. Examples of the polyisocyanate compound include, for example, aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, and alicyclic polyisocyanates such as hydrogenated diphenylmethane diisocyanate. And their biuret forms, isocyanurate forms, and adducts which are reaction products with low-molecular-weight active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil. Among them, trimethylolpropane-modified aromatic polyisocyanate, particularly trimethylolpropane-modified tolylene diisocyanate, is preferable from the viewpoint of reactivity with the reactive functional group of the (meth) acrylate polymer.

  The content of the crosslinking agent in the pressure-sensitive adhesive composition is preferably at least 0.01 part by mass, particularly preferably at least 0.05 part by mass, based on 100 parts by mass of the (meth) acrylate polymer. And more preferably 0.1 part by mass or more. Further, the content of the crosslinking agent is preferably 10 parts by mass or less, particularly preferably 1 part by mass or less, more preferably 0.5 part by mass, based on 100 parts by mass of the (meth) acrylate polymer. It is preferable that the amount is not more than part by mass.

(1-4) Active energy ray-curable component The adhesive composition in the present embodiment may contain an active energy ray-curable component. When the pressure-sensitive adhesive composition contains an active energy ray-curable component, the pressure-sensitive adhesive layer 11 obtained by curing the pressure-sensitive adhesive composition exhibits high film strength.

  The active energy ray-curable component is not particularly limited as long as it is a component that is cured by irradiation with active energy rays without impairing the effects of the present invention, and may be any of a monomer, an oligomer or a polymer, and It may be a mixture. Among them, a polyfunctional acrylate monomer having excellent compatibility with a (meth) acrylate polymer or the like is preferable.

  Examples of the polyfunctional acrylate monomer include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di (meth) acrylate. , Neopentyl glycol adipate di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone-modified dicyclopentenyl di (meth) acrylate, ethylene oxide-modified di (phosphate) (Meth) acrylate, di (acryloxyethyl) isocyanurate, allylated cyclohexyldi (meth) acrylate, ethoxylated bisphenol A diacrylate, 9,9-bis [4- (2-acrylic) Bifunctional types such as yloxyethoxy) phenyl] fluorene; trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid-modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate Trifunctional such as propylene oxide-modified trimethylolpropane tri (meth) acrylate, tris (acryloxyethyl) isocyanurate, ε-caprolactone-modified tris- (2- (meth) acryloxyethyl) isocyanurate; diglycerin tetra ( 4-functional type such as meth) acrylate and pentaerythritol tetra (meth) acrylate; 5-functional type such as propionic acid-modified dipentaerythritol penta (meth) acrylate; dipentaerythritol Hexafunctional (hexa) (meth) acrylate, caprolactone-modified dipentaerythritol hexa (meth) acrylate and the like. Among these, it is preferable to use a polyfunctional acrylate-based monomer having a molecular weight of less than 1,000 from the viewpoint of further improving the compatibility with the (meth) acrylate polymer and the like. Further, from the viewpoint of further improving the durability, it is preferable to use a polyfunctional acrylate-based monomer containing an aromatic ring or a heterocycle, and it is more preferable to use a polyfunctional acrylate-based monomer containing a nullate ring. It is particularly preferred to use (acryloxyethyl) isocyanurate. These may be used alone or in combination of two or more.

  As the active energy ray-curable component, an active energy ray-curable acrylate oligomer can be used. The acrylate oligomer preferably has a weight average molecular weight of 50,000 or less. Examples of such acrylate oligomers include polyester acrylates, epoxy acrylates, urethane acrylates, polyether acrylates, polybutadiene acrylates, and silicone acrylates.

  The weight average molecular weight of the acrylate oligomer is preferably 50,000 or less, particularly preferably 40,000 or less. Further, the weight average molecular weight is preferably 500 or more, particularly preferably 3,000 or more. These acrylate-based oligomers may be used alone or in a combination of two or more.

  Further, as the active energy ray-curable component, an adduct acrylate-based polymer having a group having a (meth) acryloyl group introduced into a side chain can also be used. Such an adduct acrylate-based polymer uses a copolymer of a (meth) acrylate ester and a monomer having a crosslinkable functional group in the molecule, and a part of the crosslinkable functional group of the copolymer. , (Meth) acryloyl group and a compound having a group that reacts with a crosslinkable functional group.

  The weight average molecular weight of the adduct acrylate polymer is preferably 50,000 or more, and particularly preferably 100,000 or more. Further, the weight average molecular weight is preferably 900,000 or less, and particularly preferably 500,000 or less.

  The active energy ray-curable component can be selected from one of the above-mentioned polyfunctional acrylate monomers, acrylate oligomers and adduct acrylate polymers, or can be used in combination of two or more. And other active energy ray-curable components.

  The content of the active energy ray-curable component in the pressure-sensitive adhesive composition is preferably 1 part by mass or more, and more preferably 3 parts by mass or more based on 100 parts by mass of the (meth) acrylate polymer. More preferably, it is preferably at least 5 parts by mass, and more preferably at least 7 parts by mass. Further, the content is preferably 50 parts by mass or less, more preferably 25 parts by mass or less, and more preferably 15 parts by mass or less, based on 100 parts by mass of the (meth) acrylate polymer. Is particularly preferred.

(1-5) Various additives The pressure-sensitive adhesive composition according to the present embodiment may optionally contain various additives such as a silane coupling agent, a photopolymerization initiator, a refractive index adjuster, an antistatic agent, a tackifier, and an oxidant. It may contain an inhibitor, an ultraviolet absorber, a light stabilizer, a softener, a filler and the like. The pressure-sensitive adhesive composition represents a mixture of various components remaining in the pressure-sensitive adhesive layer 11 as it is or in a reacted state, and is a component to be removed in a drying step or the like, for example, a polymerization described later. The solvent and the diluting solvent are not included in the pressure-sensitive adhesive composition.

  The pressure-sensitive adhesive composition also preferably contains a silane coupling agent from the viewpoint of improving the adhesive strength of the obtained pressure-sensitive adhesive. The silane coupling agent is preferably an organosilicon compound having at least one alkoxysilyl group in the molecule, having good compatibility with the adhesive component and having light transmittance.

  Examples of such a silane coupling agent include polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 2- ( Silicon compounds having an epoxy structure such as 3,4-epoxycyclohexyl) ethyltrimethoxysilane, and silicon compounds having a mercapto group such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and 3-mercaptopropyldimethoxymethylsilane , 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane Compound, 3-chloropropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, or at least one of these and an alkyl group-containing silicon such as methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, etc. Condensates with compounds are mentioned. These may be used alone or in combination of two or more.

  The content of the silane coupling agent in the pressure-sensitive adhesive composition is preferably at least 0.01 part by mass, more preferably at least 0.05 part by mass, based on 100 parts by mass of the (meth) acrylate polymer. It is preferable that the amount is more than 0.1 parts by mass. Further, the content is preferably 2 parts by mass or less, particularly preferably 1 part by mass or less, and more preferably 0.5 part by mass with respect to 100 parts by mass of the (meth) acrylate polymer. The following is preferred.

  Further, when the pressure-sensitive adhesive composition contains the active energy ray-curable component described above, and the ultraviolet ray is used as the active energy ray for curing the pressure-sensitive adhesive composition, the pressure-sensitive adhesive composition includes It is preferable to contain a polymerization initiator. By containing the photopolymerization initiator in this manner, the active energy ray-curable component can be efficiently cured, and the polymerization curing time and the irradiation amount of the active energy ray can be reduced.

  Examples of such a photopolymerization initiator include, for example, bensoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, and 2,2-dimethoxy-2-. Phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- [4- (methylthio) Phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4′-di Tylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone , 2,4-diethylthioxanthone, benzyldimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoic acid ester, oligo [2-hydroxy-2-methyl-1 [4- (1-methylvinyl) phenyl] propanone], 2 , 4,6-trimethylbenzoyl-diphenyl-phosphine oxide and the like. These may be used alone or in combination of two or more.

  The content of the photopolymerization initiator in the pressure-sensitive adhesive composition is preferably at least 1 part by mass, more preferably at least 4 parts by mass, based on 100 parts by mass of the active energy ray-curable component. Is preferably at least 8 parts by mass. In addition, the content is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and further preferably 13 parts by mass or less, based on 100 parts by mass of the active energy ray-curable component. Is preferred.

(1-6) Method for Preparing Pressure-Sensitive Adhesive Composition The pressure-sensitive adhesive composition in the present embodiment comprises a (meth) acrylate polymer, light-diffusing fine particles 111, and, if desired, a crosslinking agent, an active energy ray-curable component, and It can be prepared by mixing other additives.

  The (meth) acrylate polymer can be produced by polymerizing a mixture of monomer units constituting the polymer by a usual radical polymerization method. The polymerization of the (meth) acrylic acid ester polymer can be carried out by a solution polymerization method or the like using a polymerization initiator if desired. Examples of the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, and the like, and two or more kinds may be used in combination.

  Examples of the polymerization initiator include azo compounds and organic peroxides, and two or more of them may be used in combination. Examples of the azo compound include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane 1-carbonitrile), , 2'-Azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2'-azobis (2-methylpropionate) , 4,4'-azobis (4-cyanovaleric acid), 2,2'-azobis (2-hydroxymethylpropionitrile), 2,2'-azobis [2- (2-imidazolin-2-yl) Propane] and the like.

  Examples of the organic peroxide include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxy dicarbonate, di-n-propyl peroxy dicarbonate, and di (2-ethoxyethyl) peroxy. Examples include dicarbonate, t-butyl peroxy neodecanoate, t-butyl peroxy bivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, diacetyl peroxide and the like.

  In the above polymerization step, the weight average molecular weight of the obtained polymer can be adjusted by adding a chain transfer agent such as 2-mercaptoethanol.

  When the (meth) acrylate polymer is obtained, the light-diffusing fine particles 111 and, if desired, a crosslinking agent, an active energy ray-curable component, other additives, and dilution are added to the (meth) acrylate polymer solution. By adding a solvent and mixing well, an adhesive composition (coating solution) diluted with the solvent is obtained.

  Examples of the diluting solvent for diluting the pressure-sensitive adhesive composition into a coating liquid include, for example, hexane, heptane, aliphatic hydrocarbons such as cyclohexane, toluene, aromatic hydrocarbons such as xylene, methylene chloride, and ethylene chloride. Halogenated hydrocarbons, alcohols such as methanol, ethanol, propanol, butanol, 1-methoxy-2-propanol, ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone and cyclohexanone, esters such as ethyl acetate and butyl acetate, ethyl cellosolve And the like.

  The concentration and viscosity of the coating solution thus prepared are not particularly limited as long as they can be coated, and can be appropriately selected depending on the situation. For example, the pressure-sensitive adhesive composition is diluted so as to have a concentration of 10 to 40% by mass. In addition, in obtaining a coating liquid, addition of a diluting solvent or the like is not a necessary condition, and the diluting solvent may not be added as long as the viscosity can be coated with the pressure-sensitive adhesive composition.

(1-7) Physical Properties of Pressure-Sensitive Adhesive Layer The haze value of the pressure-sensitive adhesive layer 11 is 10% or more and 90% or less. When the haze value of the pressure-sensitive adhesive layer 11 is less than 10%, it is not possible to sufficiently suppress glare in the produced antiglare sheet. From this viewpoint, the haze value of the pressure-sensitive adhesive layer 11 is preferably 20% or more, particularly preferably 30% or more, and further preferably 50% or more. On the other hand, if the haze value of the pressure-sensitive adhesive layer 13 exceeds 90%, it is not possible to sufficiently suppress the occurrence of white tint in the manufactured antiglare sheet. From this viewpoint, the haze value of the pressure-sensitive adhesive layer 11 is preferably 80% or less, particularly preferably 70% or less, and further preferably 60% or less. In the present specification, the haze value of the pressure-sensitive adhesive layer 11 refers to an internal haze value, and details of the measurement method are as described in Test Examples described later.

  The total light transmittance of the pressure-sensitive adhesive layer 11 is preferably 80% or more, particularly preferably 85% or more, and further preferably 90% or more. When the total light transmittance is 80% or more, the display using the manufactured antiglare sheet can easily display an image well. The upper limit of the total light transmittance of the pressure-sensitive adhesive layer 11 is not particularly limited, and is preferably 100%, but when 100% cannot be achieved, it is preferably 99% or less, and particularly preferably 95%. % Is preferable. The details of the method for measuring the total light transmittance of the pressure-sensitive adhesive layer 11 are as described in Test Examples described later.

  The gel fraction of the pressure-sensitive adhesive layer 11 is preferably 40% or more, particularly preferably 60% or more, and further preferably 70% or more. Further, the gel fraction of the pressure-sensitive adhesive layer 11 is preferably 90% or less, particularly preferably 85% or less, and further preferably 80% or less. When the gel fraction of the pressure-sensitive adhesive layer 11 is in the above-described range, the pressure-sensitive adhesive layer 11 can easily achieve a desired cohesive force. The details of the method of measuring the gel fraction of the pressure-sensitive adhesive layer 11 are as described in Test Examples described later.

  The thickness of the pressure-sensitive adhesive layer 11 is preferably 5 μm or more, particularly preferably 10 μm or more, and further preferably 15 μm or more. Further, the thickness of the pressure-sensitive adhesive layer 11 is preferably 300 μm or less, particularly preferably 50 μm or less, and further preferably 30 μm or less. When the thickness of the pressure-sensitive adhesive layer 11 is 5 μm or more, the produced antiglare sheet can easily suppress the occurrence of glare, and the pressure-sensitive adhesive sheet 1 can effectively exhibit a desired adhesive force. Can be. In addition, when the thickness of the pressure-sensitive adhesive layer 11 is 300 μm or less, mixing of a residual solvent or air bubbles due to the manufacturing process is effectively prevented, and it is possible to improve the stability of adhesive force and the optical characteristics. it can.

(2) Release Sheet In the pressure-sensitive adhesive sheet 1 in the present embodiment, even if the release sheet 12 is laminated on at least one surface of the pressure-sensitive adhesive layer 11 for the purpose of protecting the pressure-sensitive adhesive layer 11 until the pressure-sensitive adhesive sheet 1 is used. Good. The release sheet 12 is released when the pressure-sensitive adhesive sheet 1 is used.

  Examples of the release sheet 12 include a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, a vinyl chloride copolymer film, a polyethylene terephthalate film, a polyethylene naphthalate film, and a polybutylene terephthalate film. , Polyurethane film, ethylene vinyl acetate film, ionomer resin film, ethylene / (meth) acrylic acid copolymer film, ethylene / (meth) acrylic acid ester copolymer film, polystyrene film, polycarbonate film, polyimide film, fluororesin film Are used. These crosslinked films are also used. Further, these laminated films may be used.

  The release surface of the release sheet 12 (the surface in contact with the pressure-sensitive adhesive layer 11) is preferably subjected to a release treatment. Examples of the release agent used in the release treatment include alkyd-based, silicone-based, fluorine-based, unsaturated polyester-based, polyolefin-based, and wax-based release agents.

  The thickness of the release sheet 12 is not particularly limited, but is usually 20 μm or more and 150 μm or less.

2. Physical Properties of Adhesive Sheet The adhesive force of the adhesive sheet 1 in the present embodiment is preferably 2 N / 25 mm or more, particularly preferably 10 N / 25 mm or more, and further preferably 15 N / 25 mm or more. Further, the adhesive strength is preferably 50 N / 25 mm or less, particularly preferably 40 N / 25 mm or less, and further preferably 30 N / 25 mm or less. When the adhesive strength of the adhesive sheet 1 is 2 N / 25 mm or more, the adhesive sheet 1 has excellent durability. When the adhesive strength is 50 N / 25 mm or less, the adhesive sheet 1 has excellent reworkability. The details of the method for measuring the adhesive strength are as described in Test Examples described later.

3. Method of Manufacturing Adhesive Sheet As an example of a method of manufacturing the adhesive sheet 1 according to the present embodiment, a coating liquid of the above-described adhesive composition is applied to the release surface of one release sheet 12 to form a coating film. Subsequently, the pressure-sensitive adhesive layer 11 is formed on one release sheet 12 by drying and further curing the coating film. Furthermore, by laminating the release surface of another release sheet 12 on the surface of the pressure-sensitive adhesive layer 11 opposite to the one release sheet 12, the pressure-sensitive adhesive layer 11 is laminated between the two release sheets 12. The resulting pressure-sensitive adhesive sheet 1 can be manufactured.

  The above-described curing of the coating film can be performed, for example, by a heat treatment. In this case, the heating temperature is preferably 50 ° C. or higher, and particularly preferably 70 ° C. or higher. Further, the heating temperature is preferably 150 ° C. or lower, particularly preferably 120 ° C. or lower. Further, the heating time is preferably at least 10 seconds, particularly preferably at least 50 seconds. In addition, the heating time is preferably 10 minutes or less, and particularly preferably 2 minutes or less. Note that the above-described coating film may be dried by such a heat treatment. After the heat treatment, a curing period of about 1 to 2 weeks may be provided at room temperature (for example, 23 ° C., 50% RH) as necessary.

  When the pressure-sensitive adhesive composition contains the active energy ray-curable component described above, before or after the above-described heat treatment, or simultaneously with the heat treatment, irradiate the above-mentioned coating film with an active energy ray, It is preferable to cure the agent composition.

  Here, the active energy beam refers to a beam having an energy quantum among electromagnetic waves or charged particle beams, and specific examples include ultraviolet rays and electron beams. Among the active energy rays, ultraviolet rays which are easy to handle are particularly preferable.

Irradiation with ultraviolet rays can be performed by a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, or the like, and the irradiation amount of ultraviolet rays is preferably about 50 to 1000 mW / cm ² . Further, the light amount is preferably at 50 mJ / cm ² or more, particularly more preferably 80 mJ / cm ² or more, and particularly preferably furthermore is 200 mJ / cm ² or more. Further, the light amount is preferably at 10000 mJ / cm ² or less, particularly preferably at 5000 mJ / cm ² or less, and further preferably not 2000 mJ / cm ² or less.

  On the other hand, electron beam irradiation can be performed by an electron beam accelerator or the like. The irradiation amount of the electron beam is preferably about 10 to 1,000 krad.

  As a method of applying the coating solution of the pressure-sensitive adhesive composition, for example, a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, or the like can be used.

4. Use of pressure-sensitive adhesive sheet The method of using the pressure-sensitive adhesive sheet 1 according to the present embodiment is not particularly limited, and can be used in the same manner as a conventional pressure-sensitive adhesive sheet. However, in the pressure-sensitive adhesive sheet 1 according to the present embodiment, since the pressure-sensitive adhesive layer 11 exhibits light diffusibility, it is preferable to use the pressure-sensitive adhesive sheet 1 in applications where such light diffusivity is required. In particular, the pressure-sensitive adhesive sheet 1 according to the present embodiment is preferably used for producing an antiglare sheet.

  FIG. 2 shows a cross-sectional view of an example of the anti-glare sheet 2 manufactured using the pressure-sensitive adhesive sheet 1 according to the present embodiment. The antiglare sheet 2 shown in FIG. 2 includes a substrate 22, an antiglare layer 21 provided on one surface of the substrate 22, and an adhesive layer provided on the other surface of the substrate 22. 11 and a release sheet 12 provided on the surface of the pressure-sensitive adhesive layer 11 opposite to the substrate 22.

  The anti-glare sheet 2 peels off one release sheet 12 of the pressure-sensitive adhesive sheet 1 according to the present embodiment, and exposes the exposed surface of the pressure-sensitive adhesive layer 11 to the base material 22 prepared in advance and the anti-glare layer. It can be manufactured by laminating to the surface on the side of the base material 22 in the laminate with 21.

  Further, the anti-glare sheet 2 may be an anti-glare scattering prevention sheet. That is, the anti-glare sheet 2 is bonded to the surface of a glass, a resin plate, or the like, and is used to prevent fragments of the glass, the resin plate, or the like from scattering when the glass, the resin plate, or the like is broken. May be done.

  In the anti-glare sheet 2 manufactured using the pressure-sensitive adhesive sheet 1 according to the present embodiment, since the pressure-sensitive adhesive layer 11 is formed from the above-described pressure-sensitive adhesive composition, excellent anti-glare properties are achieved. However, it is possible to satisfactorily suppress the occurrence of glare and also to suppress the occurrence of white tea.

(1) Anti-glare layer In the anti-glare sheet 2 described above, the anti-glare layer 21 preferably contains fine particles 211 for forming surface irregularities, as shown in FIG. Thereby, on the surface of the anti-glare layer 21 on the side opposite to the base material 22, an uneven structure according to the surface unevenness forming fine particles 211 is formed, and the desired anti-glare property is exhibited. Become.

  As for the material other than the surface unevenness forming fine particles 211 constituting the anti-glare layer 21, the above-mentioned uneven structure can be formed, and any material having conventional light-transmitting properties can be used as long as it has light transmittance. . The anti-glare layer 21 may be a layer having other functions as long as the anti-glare property of the anti-glare sheet 2 is not impaired. For example, the anti-glare layer 21 may be a hard coat layer or a wound repair layer. In particular, the anti-glare layer 21 is preferably a hard coat layer.

  The anti-glare layer 21 can be formed, for example, from an anti-glare composition containing the fine particles 211 for forming surface irregularities. The antiglare composition preferably contains a matrix component in addition to the fine particles 211 for forming surface irregularities.

(1-1) Fine Particles for Forming Surface Roughness The fine particles 211 for forming surface unevenness may be inorganic fine particles, organic fine particles, or fine particles having an intermediate structure between inorganic and organic. However, organic fine particles are preferable from the viewpoint of preventing the antiglare layer 21 from being washed out. Examples of the organic fine particles are preferably fine particles made of a translucent resin such as an acrylic resin, a polystyrene resin, a polyethylene resin, and an epoxy resin, and more preferably made of an acrylic resin. Examples of the acrylic resin include a homopolymer of methyl methacrylate and a copolymer of methyl methacrylate and a monomer such as vinyl acetate, styrene, methyl acrylate, and ethyl (meth) acrylate. No. The fine particles may be used alone or in combination of two or more.

  The shape of the fine particles 211 for forming surface irregularities may be a fixed shape such as a spherical shape, or may be an irregular shape whose shape is not specified. More preferably, there is.

  The average particle size of the fine particles 211 for forming surface irregularities by a centrifugal sedimentation light transmission method is preferably 0.8 μm or more, particularly preferably 1.0 μm or more, and further preferably 1.5 μm or more. . Further, the average particle size is preferably 10 μm or less, particularly preferably 8 μm or less, and further preferably 5 μm or less. When the average particle diameter of the fine particles 211 for forming surface irregularities is within the above range, an antiglare layer having a haze value and a surface roughness described later is easily obtained.

  The content of the fine particles 211 for forming surface irregularities in the antiglare layer 21 (antiglare composition) is preferably 0.5% by mass or more, particularly preferably 1% by mass or more, and more preferably 1% by mass or more. It is preferably at least 2% by mass. Further, the content of the fine particles 211 for forming surface irregularities in the antiglare layer 21 is preferably 30% by mass or less, particularly preferably 25% by mass or less, and further preferably 20% by mass or less. Is preferred. When the content of the fine particles 211 for forming surface irregularities in the anti-glare layer 21 is in the above-described range, the anti-glare sheet 2 can effectively exhibit anti-glare properties.

(1-2) Matrix Component As the matrix component, a resin having a light transmissivity conventionally used can be used. For example, as the resin, polyolefin resin, acrylic resin, polyester resin, styrene resin, ABS resin, vinyl chloride resin, fluorine resin, polycarbonate resin, polyester urethane resin, urethane resin, phenol resin Resins, urea resins, melamine resins, unsaturated polyester resins, epoxy resins, silicon resins, polyurethane resins, polystyrene, polyvinyl alcohol, polyvinylidene chloride, and the like can be used.

  When a hard coat layer is formed as the antiglare layer 21, the antiglare composition preferably contains a curable acrylic resin, particularly a polyfunctional (meth) acrylate, as a matrix component. In addition, as the polyfunctional (meth) acrylate, a known polyfunctional (meth) acrylate can be appropriately used.

(1-3) Other components The antiglare composition in this embodiment may contain various additives in addition to the above components. Various additives include, for example, a photopolymerization initiator, an ultraviolet absorber, an antioxidant, a light stabilizer, an antistatic agent, a leveling agent, a silane coupling agent, an antioxidant, a thermal polymerization inhibitor, a coloring agent, a refraction agent. Rate adjusters, surfactants, storage stabilizers, plasticizers, lubricants, defoamers, organic fillers, wettability improvers, coating surface improvers, and the like.

(1-4) Method for Forming Antiglare Layer The antiglare layer 21 can be formed using, for example, the above-described antiglare composition.

  The anti-glare composition can be prepared by mixing the matrix component, the fine particles 211 for forming surface irregularities, and optionally an additive.

  As a diluting solvent for diluting the antiglare composition into a coating solution, any solvent can be used without particular limitation as long as it can dissolve matrix components and the like. The use of a solvent makes it possible to improve coatability, adjust viscosity, adjust solid concentration, and the like.

  Specific examples of the solvent include alcohols such as methanol, ethanol, isopropanol, butanol and octanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; esters such as ethyl acetate, butyl acetate, ethyl lactate and γ-butyrolactone. Ethers such as ethylene glycol monomethyl ether (methyl cellosorb), ethylene glycol monoethyl ether (ethyl cellosorb), diethylene glycol monobutyl ether (butyl cellosorb), and propylene glycol monomethyl ether; aromatic hydrocarbons such as benzene, toluene, and xylene; dimethylformamide And amides such as dimethylacetamide and N-methylpyrrolidone.

  After preparing the antiglare composition as described above, a coating solution of the antiglare composition, for example, applied to one surface of the substrate 22 to form a coating film, and the coating film is dried, By further curing, the antiglare layer 21 can be formed on the substrate 22. When a hard coat layer is formed as the antiglare layer 21, the above-mentioned polyfunctional (meth) acrylate is preferably used as a matrix, and a leveling agent or the like may be added to the antiglare composition as desired. .

  The application of the coating solution of the antiglare composition may be performed by a conventional method, and for example, can be performed by the above-described method exemplified as a method for applying the coating solution of the pressure-sensitive adhesive composition. After applying the coating liquid of the antiglare composition, it is preferable to dry the coating film at 40 ° C. or more and 120 ° C. or less for about 30 seconds or more and about 5 minutes or less.

  Curing of the coating film can be performed according to the matrix component used, and can be performed by, for example, heat treatment or irradiation with active energy rays. In particular, when the above-mentioned polyfunctional (meth) acrylate is used as the matrix component, the hardening of the antiglare composition is carried out under a nitrogen atmosphere with respect to the coating film of the coating composition under an active energy ray such as an ultraviolet ray or an electron beam. Irradiation is preferably performed. Irradiation conditions for ultraviolet irradiation and electron beam irradiation may be the same as those described above.

(1-5) Physical Properties of Antiglare Layer The haze value of the antiglare layer 21 is preferably 1% or more, more preferably 5% or more, and particularly preferably 12% or more. And more preferably 18% or more. Further, the haze value of the antiglare layer 21 is preferably 50% or less, particularly preferably 40% or less, and further preferably 30% or less. When the haze value of the antiglare layer 21 is 1% or more, the occurrence of glare can be effectively suppressed by combination with the pressure-sensitive adhesive layer 11. On the other hand, when the haze value of the anti-glare layer 21 is 50% or less, the occurrence of white tint can be effectively suppressed in combination with the pressure-sensitive adhesive layer 11.

  The thickness of the antiglare layer 21 is preferably 1 μm or more, particularly preferably 2 μm or more. Further, the thickness is preferably 15 μm or less, and particularly preferably 10 μm or less. When the thickness of the anti-glare layer 21 is within the above range, both the anti-glare property and the curl prevention property can be effectively achieved.

  The arithmetic average surface roughness (Ra) of the anti-glare layer 21 on the side opposite to the substrate 22 is preferably 0.001 μm or more, particularly preferably 0.01 μm or more, and more preferably 0 μm or more. It is preferably at least 1 μm. Further, the arithmetic average surface roughness (Ra) is preferably 10 μm or less, particularly preferably 1 μm or less, and further preferably 0.5 μm or less. When the arithmetic average surface roughness (Ra) is in the above range, the anti-glare layer 21 easily exhibits excellent anti-glare properties.

  The maximum height roughness (Rz) on the surface of the antiglare layer 21 on the side opposite to the substrate 22 is preferably 0.1 μm or more, particularly preferably 0.5 μm or more, and further preferably 1 μm. It is preferable that it is above. Further, the maximum height roughness (Rz) is preferably 20 μm or less, particularly preferably 10 μm or less, and further preferably 4 μm or less. When the maximum height roughness (Rz) is in the above range, the anti-glare layer 21 easily exhibits excellent anti-glare properties while suppressing glare.

  The root-mean-square height (Rq) of the antiglare layer 21 on the side opposite to the substrate 22 is preferably 0.005 μm or more, particularly preferably 0.01 μm or more, and more preferably 0 μm or more. It is preferably at least 1 μm. Further, the root mean square height (Rq) is preferably 10 μm or less, particularly preferably 5 μm or less, and further preferably 1 μm or less. When the root-mean-square height (Rq) is within the above range, excellent antiglare properties can be easily exerted while suppressing glare.

  The maximum cross-sectional height (Rt) of the anti-glare layer 21 on the side opposite to the substrate 22 is preferably 0.1 μm or more, particularly preferably 0.5 μm or more, and more preferably 1. It is preferably at least 0 μm. Further, the maximum sectional height (Rt) is preferably 20 μm or less, particularly preferably 15 μm or less, and further preferably 10 μm or less. When the maximum cross-sectional height (Rt) is within the above range, excellent antiglare properties can be easily exerted while suppressing glare.

  The details of the above-described methods for measuring the arithmetic average surface roughness (Ra), the maximum height roughness (Rz), the root mean square height (Rq), and the maximum cross-section height (Rt) are described in Examples below. Column.

(2) Base Material The base material 22 is preferably made of a material that can achieve a desired light transmittance. When the anti-glare sheet 2 is used as an anti-glare scattering prevention sheet, it is preferable that the base material 22 is made of a material having such a strength as to prevent scattering of fragments such as glass and resin plate. Usually, the substrate 22 is made of a plastic film.

  As the plastic film, for example, polyethylene terephthalate, polybutylene terephthalate, polyester film such as polyethylene naphthalate, polyurethane film, polyethylene film, polypropylene film, cellulose film such as triacetyl cellulose, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl Plastic films such as alcohol films, ethylene-vinyl acetate copolymer films, polystyrene films, polycarbonate films, acrylic resin films, norbornene-based resin films, and cycloolefin resin films; and laminates of two or more of these. . The plastic film may be uniaxially stretched or biaxially stretched.

  The thickness of the base material 22 is usually set to 10 μm or more and 500 μm or less, but is preferably 50 μm or more, and particularly preferably 80 μm or more. Further, the thickness of the substrate 22 is preferably 300 μm or less, and particularly preferably 150 μm or less.

  The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  Hereinafter, the present invention will be described more specifically with reference to Examples and the like, but the scope of the present invention is not limited to these Examples and the like.

[Example 1]
1. Preparation of (meth) acrylate polymer 40 parts by mass of n-butyl acrylate, 10 parts by mass of acrylic acid, and 50 parts by mass of 2,2,2-trifluoroethyl acrylate were copolymerized by a solution polymerization method, A (meth) acrylate polymer was prepared. When the molecular weight of this (meth) acrylate polymer was measured by the method described later, it was 500,000 in weight average molecular weight (Mw). The refractive index of this (meth) acrylic acid ester polymer was measured by the method described later, and was 1.45.

Here, the above-mentioned weight average molecular weight (Mw) is a weight average molecular weight in terms of polystyrene measured (GPC measurement) using gel permeation chromatography (GPC) under the following conditions.
<Measurement conditions>
・ GPC measuring device: HLC-8320 manufactured by Tosoh Corporation
GPC column (passed in the following order): TSK gel superH-H manufactured by Tosoh Corporation
TSK gel super HM-H
TSK gel superH2000
-Measurement solvent: tetrahydrofuran-Measurement temperature: 40 ° C

The refractive index of the above (meth) acrylic acid ester polymer is measured under the following conditions using an Abbe refractometer (manufactured by Atago Co., Ltd., product name “Abe refractometer 4T”) according to JIS K7142: 2014. It was done.
<Measurement conditions>
・ Na light source ・ Wavelength: about 590nm

2. Preparation of pressure-sensitive adhesive composition 100 parts by mass of the obtained (meth) acrylate polymer (solid content converted value; the same applies hereinafter) and silicon-containing light-diffusing fine particles having an intermediate structure between inorganic and organic. 10.0 parts by mass of compound fine particles (product name “Tospearl 145”, manufactured by Momentive Performance Materials Japan, Inc., average particle size: 4.5 μm, refractive index: 1.43), and tri as a crosslinking agent By mixing 0.5 parts by mass of methylolpropane-modified tolylene diisocyanate and 0.2 parts by mass of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent, sufficiently stirring and diluting with methyl ethyl ketone. Thus, a coating solution of the pressure-sensitive adhesive composition was obtained.

3. Manufacture of pressure-sensitive adhesive sheet Release of a heavy release type release sheet (product name “SP-PET752150”, manufactured by Lintec Co., Ltd.) obtained by subjecting one side of a polyethylene terephthalate film to release treatment with a silicone-based release agent from the obtained coating solution of the pressure-sensitive adhesive composition. After applying to the treated surface with a knife coater, the obtained coating film was heated at 90 ° C. for 1 minute to form an adhesive layer having a thickness of 25 μm. Then, on the surface of the pressure-sensitive adhesive layer opposite to the heavy release type release sheet, a light release type release sheet (manufactured by Lintec, product name “SP-PET 382120”) in which one side of a polyethylene terephthalate film was subjected to release treatment with a silicone release agent. )) Were laminated. Thus, a pressure-sensitive adhesive sheet having a layer structure of heavy release type release sheet / pressure-sensitive adhesive layer (thickness: 25 μm) / light release type release sheet was obtained.

[Example 2]
1. Preparation of pressure-sensitive adhesive composition 100 parts by mass of a (meth) acrylate polymer obtained in the same manner as in Step 1 of Example 1, and silicon-containing light-diffusing fine particles having an intermediate structure between inorganic and organic. 7.5 parts by mass of fine particles made of a compound (manufactured by Momentive Performance Materials Japan, product name “Tospearl 145”, average particle size: 4.5 μm, refractive index: 1.43), and tri as a crosslinking agent 0.5 parts by mass of methylolpropane-modified tolylene diisocyanate, 10 parts by mass of tris (acryloxyethyl) isocyanurate as an active energy ray-curable component, and 1.0 part by mass of 1-hydroxycyclohexylphenyl ketone as a photopolymerization initiator And 0.2 parts by mass of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent. It was sufficiently stirred, by dilution with methyl ethyl ketone to obtain a coating solution of the adhesive composition.

2. Manufacture of pressure-sensitive adhesive sheet Release of a heavy release type release sheet (product name “SP-PET752150”, manufactured by Lintec Co., Ltd.) obtained by subjecting one side of a polyethylene terephthalate film to release treatment with a silicone-based release agent from the obtained coating solution of the pressure-sensitive adhesive composition. After coating on the treated surface with a knife coater, the obtained coating film was subjected to a heat treatment at 90 ° C. for 1 minute. Then, on the surface of the coating film opposite to the heavy release type release sheet, a light release type release sheet (manufactured by Lintec Co., product name "SP-PET382120") in which one side of a polyethylene terephthalate film was subjected to release treatment with a silicone release agent. By laminating the release-treated surfaces of (1), a laminate having a layer configuration of heavy release type release sheet / coating film / light release type release sheet was obtained.

Subsequently, the coating film in the obtained laminate was irradiated with ultraviolet light through the release sheet under the following conditions to cure the coating film to form a 25 μm thick adhesive layer. Thus, a pressure-sensitive adhesive sheet having a layer structure of heavy release type release sheet / pressure-sensitive adhesive layer (thickness: 25 μm) / light release type release sheet was obtained.
<Ultraviolet irradiation conditions>
・ Use of high pressure mercury lamp ・ Illuminance 300mW / cm ² , Light intensity 300mJ / cm ²
・ UV illuminance and light meter use "UVPF-A1" manufactured by Eye Graphics

[Examples 3 to 7 and Comparative Example 1]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 2 except that the type and content of the monomer constituting the (meth) acrylate polymer and the type and content of the light-diffusing fine particles were changed as shown in Table 1. .

(Reference example)
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1, except that a coating solution of the pressure-sensitive adhesive composition obtained without adding light diffusing fine particles was used.

[Production Example 1]
Acrylic resin containing polyfunctional (meth) acrylate (Arakawa Chemical Co., product name "Beamset 575CB") is mixed with acrylic resin particles having an average particle size of 2.5 μm as fine particles for forming surface irregularities, An antiglare composition was obtained. The content of the acrylic resin particles in the antiglare composition was 2% by mass. Further, the antiglare composition was diluted with propylene glycol monomethyl ether to obtain a coating solution of the antiglare composition.

  Thereafter, a coating solution of the above antiglare composition was applied to the surface of the polyester film having an easily adhesive layer as a substrate (Cosmoshine A4300, manufactured by Toyobo Co., Ltd., thickness: 125 μm) on the side of the easily adhesive layer with a wire bar # 10. Coated and dried at 70 ° C. for 1 minute.

Next, under a nitrogen atmosphere, an ultraviolet ray irradiation device (UVPF-A1, manufactured by Eye Graphics Co., Ltd.) irradiates ultraviolet rays under the following conditions to form a 2.0 μm thick hard coat layer as an antiglare layer on the substrate. Was formed. Thus, a laminate of the base material and the antiglare layer (hereinafter, referred to as “laminate A”) was obtained. In addition, according to the laminate A, it was confirmed that good antiglare properties could be exhibited.
<Ultraviolet irradiation conditions>
・ Light source: High pressure mercury lamp ・ Lamp power: 2kW
・ Conveyor speed: 4.23m / min
・ Illuminance: 240 mW / cm ²
・ Light quantity: 307 mJ / cm ²

  Table 2 summarizes the configuration and physical properties of the laminate A. The haze value (%) in Table 2 is measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "NDH2000") according to JIS K7136: 2000, JIS K7361-1: 1997 and ASTM D 1003. Measured. In Table 2, various surface roughnesses (arithmetic mean surface roughness Ra, root mean square height Rq, maximum height roughness Rz, and maximum cross-section height Rt; each unit is nm) are as follows. The surface on the anti-glare layer side was measured using a light interference microscope (manufactured by Veeco, product name “Surface profile measuring device WYKO NT110”) in accordance with JIS B0601: 2013. When measuring the surface roughness, the measurement conditions were set to PSI and the magnification was set to 50 times, and the average value at five measurement points was defined as the value of the surface roughness.

[Production Example 2]
Acrylic resin containing polyfunctional (meth) acrylate (Arakawa Chemical Co., Ltd., product name “Beamset 575CB”) is mixed with acrylic resin particles having an average particle size of 3.5 μm as fine particles for forming surface irregularities. An antiglare composition was obtained. The content of the amorphous silica particles in the antiglare composition was 15% by mass. Further, the antiglare composition was diluted with toluene to obtain a coating solution of the antiglare composition.

  Thereafter, a coating solution of the antiglare composition was applied to one surface of a triacetylcellulose film (Konica Minolta, product name “KC8UYW”, thickness: 80 μm) as a substrate with a wire bar # 10. At 70 ° C. for 1 minute.

  Next, ultraviolet irradiation was performed under the same conditions as the ultraviolet irradiation in Production Example 1 to form a 3.0 μm-thick hard coat layer as an antiglare layer on the substrate. Thus, a laminate of the substrate and the antiglare layer (hereinafter, referred to as “laminate B”) was obtained. In addition, according to the laminate B, it was confirmed that good antiglare properties can be exhibited.

  Table 2 summarizes the configuration and physical properties of the laminate B. The haze values in Table 2 were measured by the same method as in Production Example 1. The various surface roughnesses in Table 2 were measured on the surface of the laminate B on the side of the antiglare layer by the same method as in Production Example 1.

[Test Example 1] (Measurement of gel fraction)
The pressure-sensitive adhesive sheets obtained in Examples, Comparative Examples and Reference Examples were cut into a size of 80 mm × 80 mm, the pressure-sensitive adhesive layer was wrapped in a polyester mesh (mesh size 200), and the mass was weighed with a precision balance. By subtracting the mass of the mesh alone, the mass of the pressure-sensitive adhesive alone was calculated. The mass at this time is defined as M1.

  Next, the adhesive wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23 ° C.) for 24 hours. Thereafter, the adhesive was taken out, air-dried for 24 hours in an environment at a temperature of 23 ° C. and a relative humidity of 50%, and further dried in an oven at 80 ° C. for 12 hours. After drying, the mass was weighed with a precision balance, and the mass of the adhesive alone was calculated by subtracting the mass of the mesh alone. The mass at this time is defined as M2. The gel fraction (%) is represented by (M2 / M1) × 100. Table 3 shows the results.

[Test Example 2] (Measurement of adhesive strength)
The light-peelable release sheet was peeled off from the pressure-sensitive adhesive sheets obtained in Examples, Comparative Examples and Reference Examples, and the exposed pressure-sensitive adhesive layer was replaced with a polyethylene terephthalate film having an easily adhesive layer (manufactured by Toyobo Co., Ltd., product name "PET A4300", (Thickness: 100 μm). The laminate was cut into a width of 25 mm and a length of 100 mm, which was used as a sample. The heavy release type release sheet was peeled off from the sample, and the exposed pressure-sensitive adhesive layer was attached to soda lime glass (manufactured by Nippon Sheet Glass).

  Then, after leaving for 24 hours under the conditions of normal pressure, 23 ° C. and 50% RH, the peeling rate was measured using a tensile tester (manufactured by Orientec, product name “Tensilon”) according to JIS Z0237: 2009. The adhesive strength (N / 25 mm) was measured under the conditions of 300 mm / min and a peel angle of 180 °. Table 3 shows the results.

[Test Example 3] (Measurement of haze value of pressure-sensitive adhesive layer)
Using the haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "NDH2000") with respect to the pressure-sensitive adhesive sheets obtained in Examples, Comparative Examples, and Reference Examples, with the release sheets on both sides adhered thereto, JIS K7136: 2000, JIS K7361-1: 1997 and ASTM D 1003. The haze value (%) was measured, and the haze value (internal haze value) of the pressure-sensitive adhesive layer was calculated by subtracting the haze value of the release sheet on both sides. The results are shown in Table 3 as the haze value (%) of the pressure-sensitive adhesive layer.

[Test Example 4] (Measurement of total light transmittance of pressure-sensitive adhesive layer)
The total light transmittance (%) of the pressure-sensitive adhesive sheets obtained in Examples, Comparative Examples and Reference Examples was measured in accordance with JIS K7361-1: 1997 using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name “NDH2000”). Measured according to Table 3 shows the measurement results as the total light transmittance (%) of the pressure-sensitive adhesive layer.

[Test Example 5] (Evaluation of glare)
Peeling a light release type release sheet from the pressure-sensitive adhesive sheets obtained in Examples, Comparative Examples and Reference Examples, and bonding the exposed pressure-sensitive adhesive layer to the substrate-side surface of the laminate A manufactured in Production Example 1 Thus, an antiglare sheet was obtained.

  The heavy release type release sheet was peeled off from the obtained anti-glare sheet, and the exposed surface of the exposed pressure-sensitive adhesive layer was exposed on a tablet terminal (product name “iPad (registered trademark)” manufactured by Apple Inc., display surface definition: 264 dpi). Affixed to the display surface. Then, the display surface of the tablet terminal was adjusted to emit only green light, and the effect of suppressing glare by the antiglare sheet was visually confirmed.

  Then, a case where glare is frequently confirmed is set to “1”, and a case where no glare is confirmed is set to “5”. As the degree of the glare decreases, the numerical value increases from “1” to “5”. Five increasing criteria were set, and glare was evaluated based on the criteria. Table 3 shows the evaluation results.

  In addition, instead of the above-described laminate A, an anti-glare sheet was produced using the laminate B manufactured in Production Example 2, and the anti-glare sheet was also evaluated based on a five-step standard in the same manner as described above. The glare was evaluated. The results are also shown in Table 3.

[Test Example 6] (Evaluation of white tea)
Peeling a light release type release sheet from the pressure-sensitive adhesive sheets obtained in Examples, Comparative Examples and Reference Examples, and bonding the exposed pressure-sensitive adhesive layer to the substrate-side surface of the laminate A manufactured in Production Example 1 Thus, an antiglare sheet was obtained.

  The heavy release type release sheet was peeled off from the obtained antiglare sheet, and the exposed surface of the exposed pressure-sensitive adhesive layer was stuck on a black acrylic plate. Then, the degree of whiteness of the adhesive sheet was visually confirmed.

  Then, the case where the whiteness is clearly recognized is set to “1”, and the case where the whiteness is not recognized at all is set to “5”, and from “1” as the degree of the whiteness decreases. A five-level criterion in which the numerical value increases toward “5” was provided, and the whiteness was evaluated based on the criterion. Table 3 shows the evaluation results.

  In addition, instead of the above-described laminate A, an anti-glare sheet was produced using the laminate B manufactured in Production Example 2, and the anti-glare sheet was also evaluated based on a five-step standard in the same manner as described above. Was evaluated for white tea. The results are also shown in Table 3.

[Test Example 7] (Evaluation of durability)
Peeling a light release type release sheet from the pressure-sensitive adhesive sheets obtained in Examples, Comparative Examples and Reference Examples, and bonding the exposed pressure-sensitive adhesive layer to the substrate-side surface of the laminate A manufactured in Production Example 1 Thus, an antiglare sheet was obtained.

  The heavy release type release sheet was peeled off from the obtained antiglare sheet, and the exposed surface of the exposed pressure-sensitive adhesive layer was adhered to soda lime glass (manufactured by Nippon Sheet Glass). The laminate thus obtained was pressurized in an autoclave (manufactured by Kurihara Seisakusho) at 0.5 MPa and 50 ° C. for 30 minutes, and then left at room temperature overnight.

Subsequently, the laminate was stored under high-temperature and high-humidity conditions of 85 ° C. and 85% RH for 72 hours. Thereafter, the state at the interface between the pressure-sensitive adhesive layer and the soda-lime glass was visually confirmed, and the durability was evaluated according to the following criteria. Table 3 shows the results.
…: There were no bubbles, floating or peeling.
Δ: Micro bubbles were generated, but no floating or peeling was observed.
×: Bubbles, floating and peeling occurred.

[Test Example 8] (Evaluation of scattering prevention effect)
Peeling a light release type release sheet from the pressure-sensitive adhesive sheets obtained in Examples, Comparative Examples and Reference Examples, and bonding the exposed pressure-sensitive adhesive layer to the substrate-side surface of the laminate A manufactured in Production Example 1 Thus, an anti-glare scattering prevention sheet was obtained.

  Next, the heavy release type release sheet of the antiglare anti-scattering sheet was peeled off, and the exposed pressure-sensitive adhesive layer was applied to a glass plate (manufactured by NSG Precision, product name "Corning Glass Eagle XG", 90 mm long x 50 mm wide x 0 mm thick). .5 mm) and used as an evaluation sample.

  On a smooth table, two stainless steel plates (thickness: 2 cm) were arranged parallel to each other at 50 mm intervals. Then, the evaluation sample was placed so that the glass plate side was at the top and the antiglare and scattering prevention sheet side of the evaluation sample was in contact with the stainless steel plate at 20 mm both ends in the longitudinal direction of the evaluation sample.

Next, a 130 g stainless steel ball was dropped from a height of 60 cm to the center of the evaluation sample. Then, the state of scattering of glass pieces resulting from breakage of the glass plate was confirmed, and the scattering prevention effect was evaluated according to the following criteria. Table 3 shows the results.
〇: All the glass pieces were held by the antiglare scattering prevention sheet, and the glass pieces did not scatter.
×: At least some of the glass pieces were scattered.

The details of the abbreviations and the like described in Tables 1 and 2 are as follows.
[monomer]
BA: n-butyl acrylate AA: acrylate HEA: 2-hydroxyethyl acrylate V-3F: 2,2,2-trifluoroethyl acrylate V-4F: 2,2,2,3-tetrafluoroacrylate Propyl [light diffusion fine particles]
Tospearl 145: fine particles made of a silicon-containing compound having an intermediate structure between inorganic and organic (manufactured by Momentive Performance Materials Japan, product name “Tospearl 145”, average particle size: 4.5 μm, refractive index: 1) .43)
Tospearl 200B: fine particles made of a silicon-containing compound having an intermediate structure between inorganic and organic (manufactured by Momentive Performance Materials Japan, product name “Tospearl 200B”, average particle size: 6.0 μm, refractive index: 1) .43)
[Base material]
PET: Polyester film with easy adhesion layer (Cosmo Shine A4300, manufactured by Toyobo Co., Ltd., thickness: 125 μm)
TAC: Triacetylcellulose film (Konica Minolta, product name “KC8UYW”, thickness: 80 μm)

  As can be seen from Table 3, in the pressure-sensitive adhesive sheet according to the example, it was possible to favorably suppress the discoloration while suppressing the occurrence of glare. On the other hand, in the pressure-sensitive adhesive sheet according to the comparative example, although it was possible to suppress the occurrence of glare, it was not possible to sufficiently suppress the occurrence of discoloration. In addition, in the pressure-sensitive adhesive sheet according to the reference example, although the occurrence of white tea was sufficiently suppressed, the occurrence of glare could not be suppressed.

  The pressure-sensitive adhesive sheet of the present invention can be suitably used, for example, for producing an antiglare sheet.

DESCRIPTION OF SYMBOLS 1 ... Adhesive sheet 11 ... Adhesive layer 111 ... Light diffusing fine particles 12 ... Release sheet 2 ... Anti-glare sheet 21 ... Anti-glare layer 211 ... Particles for forming surface irregularities 22 ... Base

Claims (8)

An adhesive sheet having an adhesive layer,
The pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth) acrylic acid ester polymer containing a (meth) acrylic acid fluoroalkyl ester as a monomer unit constituting the polymer, and light diffusing fine particles. And
The pressure-sensitive adhesive sheet, wherein the haze value of the pressure-sensitive adhesive layer is 10% or more and 90% or less.   The pressure-sensitive adhesive sheet according to claim 1, wherein a difference in refractive index between the (meth) acrylate polymer and the light-diffusing fine particles is 0.01 or more and 0.05 or less.   The pressure-sensitive adhesive sheet according to claim 1, wherein the refractive index of the (meth) acrylate polymer is 1.42 or more and 1.47 or less.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein a refractive index of the light diffusing fine particles is 1.40 or more and 1.46 or less.   The said (meth) acrylic acid ester polymer contains 5 mass% or more and 90 mass% or less of the said (meth) acrylic acid fluoroalkylester as a monomer unit which comprises the said polymer. Item 5. The pressure-sensitive adhesive sheet according to any one of Items 1 to 4.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 5, wherein the pressure-sensitive adhesive composition contains a crosslinking agent.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 6, wherein the pressure-sensitive adhesive composition contains an active energy ray-curable component. A base material, an antiglare layer provided on one surface side of the base material, and an antiglare sheet including an adhesive layer provided on the other surface side of the base material,
The pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer having a pressure-sensitive adhesive sheet according to any one of claims 1 to 7,
The anti-glare sheet, wherein the anti-glare layer contains fine particles for forming surface irregularities.

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