JP2019203931A - Anti-glare film, and manufacturing method and application of the same - Google Patents

Abstract

To provide an anti-glare film satisfying a surface smoothness with a finger and abrasion resistance at the same time.SOLUTION: In the anti-glare film having an anti-glare layer on the surface, the uneven shape of the anti-glare layer surface is adjusted to a shape that satisfies at least two or more characteristics of the following characteristics (1) to (3). (1) The arithmetic mean roughness Ra is 0.05 to 0.25 μm. (2) The average length RSm of roughness curve elements is 5 to 25 μm. (3) The maximum cross-sectional height Rt of the roughness curve is 0.1 to 1 μm, and further, the haze of the anti-glare film was adjusted to 1 to 60%, adjusting the 60° gloss of the anti-glare layer surface to 0.1 to 70%. The anti-glare film may have a dynamic friction coefficient of the anti-glare layer surface measured under conditions of load 0.2 N, moving speed 50 mm/s, and effective measuring distance at 50 mm is 3 or less, using the surface contact with artificial skin.SELECTED DRAWING: None

Description

  The present invention is suitable for preventing reflection of an external light source on the display surface of various display devices such as a liquid crystal display device (LCD) with a touch panel and an organic electroluminescence (EL) display, and has a good sliding feel with a finger. In addition, the present invention relates to an antiglare film excellent in scratch resistance, which is difficult to be scratched by friction, and a method for producing the same and use thereof.

  The antiglare film is widely used as a film for preventing reflection of an outside scene on a display surface in an image display device such as an LCD or an organic EL display and improving visibility. In the antiglare film, an antiglare property is expressed by forming a concavo-convex shape on the surface and scattering and reflecting external light, but as a method for forming the concavo-convex shape, a method of adding particles to a binder resin, A method using phase separation of a plurality of resins is known.

  Japanese Patent No. 5846243 (Patent Document 1) discloses an optical laminate comprising a light transmissive substrate and an antiglare layer on the light transmissive substrate, wherein the outermost surface of the antiglare layer is It has an uneven shape, the average inclination angle of the uneven portion is θa, the average roughness of the unevenness is Rz, the average interval Sm of the unevenness, and the ratio ψ of Rz and Sm is defined as the ratio ψ≡Rz / Sm, When θa and Rz are measured with a reference length of 0.25 mm, and Sm is measured with a reference length of 0.80 mm, θa is 1.2 to 2.5 ° and the ratio ψ is 0.016 to 0. 0. 121, and an optical laminate having an internal haze and a surface haze of 0 to 50% and 0.5 to 4.5%, respectively, is disclosed.

  JP-A-2015-125234 (Patent Document 2) discloses an antiglare film in which an antiglare layer having a sea-island structure is formed on one surface of a transparent substrate, and the sea-island structure is a sea region. The first resin component, the island region includes a second resin component, the second resin component in the island region includes aggregated fine particles, the haze is 0.3 to 5%, and the antiglare layer An antiglare film having a surface with an arithmetic average roughness Ra of 40 to 150 nm and an average unevenness interval of Sm 40 to 150 μm is disclosed.

  JP-A-2006-335574 (Patent Document 3) includes a transparent base material and an antiglare layer disposed on at least one surface of the transparent base material. Is an uneven surface, the average interval Sm between the uneven surfaces is 150 to 350 μm, the average inclination angle θa is 0.1 to 2.5 °, and the arithmetic average surface roughness Ra is 0.1. An antiglare film having a thickness of 05 to 0.5 μm is disclosed.

Japanese Patent No. 6190581 (Patent Document 4) discloses an anti-glare film including an anti-glare layer having an elongated protrusion formed on the surface thereof in accordance with phase separation of a plurality of resin components. %, The elongated protrusion has a branched structure, and the total length is 100 μm or more, and the elongated protrusion is 1 per 1 mm ^{2 on} the surface of the antiglare layer. An antiglare film is disclosed in which the length ratio of the long convex portion having the branched structure and the other convex portion is the former / the latter = 100/0 to 70/30.

  However, in these anti-glare films, if the surface layer is roughened to cope with recent high-definition LCDs and organic EL displays, the anti-glare property is increased, but the unevenness of the unevenness also increases. For this reason, when friction occurs, force concentrates on a portion with high unevenness, and there is a possibility that scraping or missing of particles may occur depending on the state of the uneven structure, resulting in insufficient scratch resistance.

Japanese Patent No. 5846243 (Claim 1) Japanese Patent Laying-Open No. 2015-125234 (Claims 1 and 2) JP, 2006-335574, A (Claim 1) Japanese Patent No. 6190581 (Claims 1 and 3)

  Accordingly, an object of the present invention is to provide an antiglare film that simultaneously satisfies antiglare properties, surface slipperiness with fingers, and scratch resistance, and a method for producing the same.

  As a result of intensive studies to achieve the above-mentioned problems, the inventors have adjusted the uneven shape of the antiglare layer surface to a specific shape, and further adjusted the haze and the gloss of the antiglare layer surface to a specific range. The inventors have found that the antiglare property, the surface slipperiness with a finger, and the scratch resistance can be satisfied at the same time, thereby completing the present invention.

  That is, the antiglare film of the present invention is an antiglare film having an antiglare layer on its surface, having a haze of 1 to 60%, a 60 ° gloss on the surface of the antiglare layer of 0.1 to 70%, and The uneven shape on the surface of the antiglare layer satisfies at least two of the following properties (1) to (3).

(1) Arithmetic average roughness Ra is 0.05 to 0.25 μm (2) Average length RSm of roughness curve element is 5 to 25 μm (3) Maximum cross section height Rt of roughness curve is 0 .1 to 1 μm.

  The antiglare film preferably satisfies all of the characteristics (1) to (3). The antiglare film has a dynamic friction coefficient of 3 or less on the surface of the antiglare layer measured using a surface contact with an artificial skin attached under the conditions of a load of 0.2 N, a moving speed of 50 mm / second, and an effective measurement distance of 50 mm. There may be. The antiglare layer may be a cured product of a curable composition containing one or more polymer components and one or more cured resin precursor components. The polymer component may contain cellulose esters and / or a (meth) acrylic polymer which may have a polymerizable group. The cured resin precursor component may contain urethane (meth) acrylate. The number of (meth) acryloyl groups in one molecule of the urethane (meth) acrylate may be 5-20. The cured resin precursor component may further contain a fluorine-based compound having a polymerizable group. The curable composition may further contain a filler.

  The present invention also includes a method for producing the antiglare film including the antiglare layer forming step of forming an uneven shape by phase separation by wet spinodal decomposition.

  The present invention also includes a display device including the antiglare film. This display device may be a liquid crystal display device with a touch panel or an organic EL display.

  In the present specification and claims, (meth) acrylate includes both methacrylic acid ester and acrylic acid ester.

  In the present invention, the uneven shape on the surface of the antiglare layer is adjusted to a specific shape, and further, the haze and the gloss of the surface of the antiglare layer are also adjusted to a specific range. Scratch resistance can be satisfied at the same time.

[Anti-glare layer]
The antiglare film of the present invention may have a specific surface shape and have an antiglare layer on the surface for expressing specific optical characteristics, and the material and structure of the antiglare layer are not limited, It is formed of a transparent material having a fine uneven shape formed on the surface, and the uneven shape can suppress the reflection of an outside scene due to surface reflection and improve the antiglare property.

  The antiglare layer only needs to be formed of a transparent material, and may be formed of any material of an organic material and an inorganic material. However, from the viewpoint of productivity and handleability, the antiglare layer is a composition containing a resin component. The formed antiglare layer is preferred. As described above, the surface of the antiglare layer usually has a concavo-convex shape, and this concavo-convex shape is not particularly limited, and is a concavo-convex shape formed by physical processing or transfer using a mold. However, in terms of productivity, in the antiglare layer formed of the resin component-containing composition, the fine irregularities formed by the phase separation structure of the resin component and the fine shape corresponding to the particle shape An uneven shape may be used. Among them, in a cured product of a curable composition containing one or more kinds of cured resin precursor components, uneven shapes formed by spinodal decomposition (wet spinodal decomposition) from a liquid phase, particles (for example, polyamide particles, etc.) Concavities and convexities formed by the shape of particles containing thermoplastic resin particles, crosslinked poly (meth) acrylate particles, crosslinked polymer particles such as crosslinked polystyrene particles and crosslinked polyurethane particles, and inorganic particles such as silica particles) The shape is preferable, and the uneven shape formed by wet spinodal decomposition is particularly preferable because it is easy to form a regular uneven shape with small variations.

  The antiglare layer having an uneven shape formed by wet spinodal decomposition may be a cured product of a curable composition containing one or more polymer components and one or more cured resin precursor components. Specifically, the antiglare layer uses a composition (mixed liquid) containing one or more polymer components, one or more cured resin precursor components, and a solvent, and the solvent is dried from the liquid phase of the composition. In the process of evaporation or removal, phase separation due to spinodal decomposition occurs with concentration, and a phase separation structure having a relatively regular interphase distance can be formed. More specifically, the wet spinodal decomposition can be usually performed by coating the composition (homogeneous solution) on a support such as a base material layer and evaporating the solvent from the coating layer.

(Polymer component)
As the polymer component, a thermoplastic resin is usually used. The thermoplastic resin is not particularly limited as long as it has high transparency and can form the above-described surface irregularities by spinodal decomposition. For example, styrene resin, (meth) acrylic polymer, organic acid vinyl ester polymer, vinyl ether Polymer, halogen-containing resin, polyolefin (including alicyclic polyolefin), polycarbonate, polyester, polyamide, thermoplastic polyurethane, polysulfone resin (polyethersulfone, polysulfone, etc.), polyphenylene ether resin (2,6-xylenol) Polymers), cellulose derivatives (cellulose esters, cellulose carbamates, cellulose ethers, etc.), silicone resins (polydimethylsiloxane, polymethylphenylsiloxane, etc.), rubber or elastomers ( Li butadiene, diene rubbers such as polyisoprene, styrene - butadiene copolymer, acrylonitrile - butadiene copolymer, acrylic rubber, urethane rubber, silicone rubber, etc.), and others. These thermoplastic resins can be used alone or in combination of two or more.

  Among these polymer components, styrene resin, (meth) acrylic polymer, vinyl acetate polymer, vinyl ether polymer, halogen-containing resin, alicyclic polyolefin, polycarbonate, polyester, polyamide, cellulose derivative, silicone type Resin, rubber or elastomer is generally used. In addition, as the polymer component, a polymer component that is non-crystalline and is soluble in an organic solvent (particularly, a common solvent that can dissolve a plurality of polymer components and a cured resin precursor component) is used. In particular, polymer components having high moldability or film formability, transparency and weather resistance, such as styrene resins, (meth) acrylic polymers, alicyclic polyolefins, polyesters, cellulose derivatives (cellulose esters, etc.), etc. (Meth) acrylic polymers and cellulose esters are particularly preferable.

As the (meth) acrylic polymer, a (meth) acrylic monomer alone or a copolymer, a copolymer of a (meth) acrylic monomer and a copolymerizable monomer, or the like can be used. Examples of (meth) acrylic monomers include (meth) acrylic acid; methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, t-butyl (meth) acrylate, ( (Meth) acrylic acid isobutyl, (meth) acrylic acid hexyl, (meth) acrylic acid octyl, (meth) acrylic acid 2-ethylhexyl and other (meth) acrylic acid C _1-10 alkyl; (meth) acrylic acid cyclohexyl ( (Meth) acrylate cycloalkyl; aryl (meth) acrylates such as phenyl (meth) acrylate; hydroxyalkyl (meth) acrylates such as hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate; glycidyl (meth) acrylate; N, N-dialkylaminoalkyl (meth) acrylate (Meth) acrylonitrile; (meth) acrylate having an alicyclic hydrocarbon group such as tricyclodecane. Examples of the copolymerizable monomer include styrene monomers such as styrene, vinyl ester monomers, maleic anhydride, maleic acid, and fumaric acid. These monomers can be used alone or in combination of two or more.

Examples of (meth) acrylic polymers include poly (meth) acrylic acid esters such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymers, and methyl methacrylate- (meth) acrylic acid esters. Examples thereof include a polymer, a methyl methacrylate-acrylic acid ester- (meth) acrylic acid copolymer, and a (meth) acrylic acid ester-styrene copolymer (MS resin and the like). Of these, poly (meth) acrylic acid C _1-6 alkyl such as poly (meth) acrylic acid methyl, especially methyl methacrylate as a main component (about 50 to 100% by mass, preferably about 70 to 100% by mass). A methyl methacrylate polymer is preferred.

Examples of cellulose esters include aliphatic organic acid esters (cellulose acetate such as cellulose diacetate and cellulose triacetate; C _1-6 such as cellulose propionate, cellulose butyrate, cellulose acetate propionate, and cellulose acetate butyrate). Examples include aliphatic carboxylic acid esters, aromatic organic acid esters (C _7-12 aromatic carboxylic acid esters such as cellulose phthalate and cellulose benzoate), inorganic acid esters (eg, cellulose phosphate, cellulose sulfate, etc.), and the like. It may be a mixed acid ester such as acetic acid / cellulose nitrate ester. These cellulose esters can be used alone or in combination of two or more. Among these, cellulose C _2-4 acylates such as cellulose diacetate, cellulose triacetate, cellulose acetate propionate, and cellulose acetate butyrate are preferable, and cellulose acetate C _3-4 acylate such as cellulose acetate propionate is particularly preferable.

The polymer component [particularly the (meth) acrylic polymer] may be a polymer having a functional group involved in the curing reaction (or a functional group capable of reacting with the cured resin precursor component). The polymer may have a functional group in the main chain or a side chain. The functional group may be introduced into the main chain by copolymerization or cocondensation, but is usually introduced into the side chain. Examples of such functional groups include condensable groups and reactive groups (for example, hydroxyl groups, acid anhydride groups, carboxyl groups, amino groups or imino groups, epoxy groups, glycidyl groups, isocyanate groups, etc.), polymerizable groups [ For example, C _2-6 alkenyl groups such as vinyl, propenyl, isopropenyl, butenyl and allyl, C _2-6 alkynyl groups such as ethynyl, propynyl and butynyl, C _2-6 alkenylidene groups such as vinylidene, or their polymerizability Examples include groups having a group (such as (meth) acryloyl group). Of these functional groups, a polymerizable group is preferable.

  As a method for introducing a polymerizable group into a side chain, for example, a thermoplastic resin having a functional group such as a reactive group or a condensable group is reacted with a polymerizable compound having a reactive group with the functional group. A method etc. can be illustrated.

  In the thermoplastic resin having a functional group, examples of the functional group include a carboxyl group or an acid anhydride group, a hydroxyl group, an amino group, and an epoxy group.

When the thermoplastic resin having a functional group is a thermoplastic resin having a carboxyl group or its acid anhydride group, examples of the polymerizable compound having a reactive group with the functional group include an epoxy group, a hydroxyl group, and an amino group. Examples thereof include a polymerizable compound having a group or an isocyanate group. Among these, polymerizable compounds having an epoxy group, for example, epoxycyclo C _5-8 alkenyl (meth) acrylates such as epoxycyclohexenyl (meth) acrylate, glycidyl (meth) acrylate, allyl glycidyl ether, etc. are widely used.

  As a typical example, a thermoplastic resin having a carboxyl group or its acid anhydride group and an epoxy group-containing compound, particularly a (meth) acrylic polymer ((meth) acrylic acid- (meth) acrylic acid ester copolymer) Etc.) and an epoxy group-containing (meth) acrylate (such as epoxycycloalkenyl (meth) acrylate and glycidyl (meth) acrylate). Specifically, a polymer having a polymerizable unsaturated group introduced into a part of the carboxyl group of the (meth) acrylic polymer, for example, the carboxyl group of the (meth) acrylic acid- (meth) acrylic acid ester copolymer. A (meth) acrylic polymer (cyclomer P, cyclomer P, in which a polymerizable group (photopolymerizable unsaturated group) is introduced into a side chain by reacting an epoxy group of 3,4-epoxycyclohexenylmethyl acrylate in part. Daicel Corporation) can be used.

  The amount of the functional group (particularly polymerizable group) involved in the curing reaction for the thermoplastic resin is, for example, 0.001 to 10 moles, preferably 0.01 to 5 moles, more preferably 1 kg of the thermoplastic resin. It is about 0.02 to 3 mol.

These polymer components can be used in appropriate combination. That is, the polymer component may be composed of a plurality of polymers. The plurality of polymers may be phase separable by wet spinodal decomposition. The plurality of polymers may be incompatible with each other. When combining a plurality of polymers, the combination of the first polymer and the second polymer is not particularly limited, but suitable as a plurality of polymers that are incompatible with each other near the processing temperature, for example, two polymers that are incompatible with each other Can be used in combination. For example, when the first polymer is a (meth) acrylic polymer (for example, polymethyl methacrylate, (meth) acrylic polymer having a polymerizable group, etc.), the second polymer is a cellulose ester ( Cellulose acetate C _3-4 acylate such as cellulose acetate propionate) or polyester (urethane modified polyester or the like) may be used.

  Further, from the viewpoint of scratch resistance after curing, at least one of a plurality of polymers, for example, one of the incompatible polymers (when combining the first polymer and the second polymer) , At least one polymer) is preferably a polymer having a functional group (particularly a polymerizable group) capable of reacting with the cured resin precursor component in the side chain.

  The mass ratio between the first polymer and the second polymer can be selected, for example, from the range of the former / the latter = 1/99 to 99/1, preferably about 10/90 to 97/3. When it is a (meth) acrylic polymer and the second polymer is a cellulose ester, the mass ratio of both polymers is the former / the latter = 30/70 to 95/5, preferably 50/50 to 90/10. More preferably, it is about 60/40 to 85/15 (particularly 70/30 to 80/20). In the present invention, the surface shape and haze of the antiglare layer can be adjusted by adjusting the ratio of both polymers, and Ra, RSm and Rt, which are the surface shapes, can be reduced by increasing the ratio of cellulose esters. , Haze can also be reduced. In addition, the specific ratio of both polymers can be suitably selected according to the kind etc. of the cured resin precursor component mentioned later.

  In addition, as a polymer for forming a phase-separated structure, the said thermoplastic resin and another polymer other than the said two incompatible polymers may be contained.

  The glass transition temperature of the polymer component can be selected from the range of, for example, −100 ° C. to 250 ° C., preferably −50 ° C. to 230 ° C., and more preferably about 0 to 200 ° C. (for example, about 50 to 180 ° C.). From the viewpoint of surface hardness, the glass transition temperature is advantageously 50 ° C. or higher (for example, about 70 to 200 ° C.), preferably 100 ° C. or higher (for example, about 100 to 170 ° C.). The weight average molecular weight of the polymer component can be selected, for example, from 1,000,000 or less, preferably from about 1,000 to 500,000.

(Curing resin precursor component)
The cured resin precursor component is a compound having a functional group that reacts with heat or active energy rays (such as ultraviolet rays or electron beams), and is cured or crosslinked with heat or active energy rays to give a resin (particularly cured or crosslinked). Various curable compounds capable of forming (resin) can be used. Examples of the cured resin precursor component include thermosetting compounds or resins [low molecular weight compounds having epoxy groups, polymerizable groups, isocyanate groups, alkoxysilyl groups, silanol groups, etc. (for example, epoxy resins, unsaturated polyesters). Resin, urethane resin, silicone resin, etc.)], photocurable compounds curable with actinic rays (such as ultraviolet rays) (photocurable monomers, ultraviolet curable compounds such as oligomers), etc. The curable compound may be an EB (electron beam) curable compound. Note that a photocurable compound such as a photocurable monomer, an oligomer, or a photocurable resin that may have a low molecular weight may be simply referred to as a “photocurable resin”.

  Examples of the photocurable compound include monomers and oligomers (or resins, particularly low molecular weight resins).

  Examples of the monomers include monofunctional monomers [(meth) acrylic monomers such as (meth) acrylic acid esters, vinyl monomers such as vinylpyrrolidone, isobornyl (meth) acrylate, adamantyl ( (Meth) acrylate having a bridged cyclic hydrocarbon group such as (meth) acrylate], polyfunctional monomer having at least two polymerizable unsaturated bonds [ethylene glycol di (meth) acrylate, propylene glycol di (meth) ) Acrylate, butanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, alkylene glycol di (meth) acrylate such as hexanediol di (meth) acrylate; diethylene glycol di (meth) acrylate, dipropylene glycol di (meth) ) Acrylate, (Poly) oxyalkylene glycol di (meth) acrylate such as reoxytetramethylene glycol di (meth) acrylate; bridged cyclic hydrocarbon groups such as tricyclodecane dimethanol di (meth) acrylate and adamantane di (meth) acrylate Di (meth) acrylate having: glycerin tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, penta Polymerizable unsaturation of about 3 to 6 such as erythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate Polyfunctional monomer having a focus, etc.], and others. Of these, polyfunctional (meth) acrylates having at least two (meth) acryloyl groups are widely used.

  Examples of the oligomer or resin include (meth) acrylates, epoxy (meth) acrylates, polyester (meth) acrylates, urethane (meth) acrylates, and silicone (meth) acrylates of bisphenol A-alkylene oxide adducts.

  These photocurable compounds can be used alone or in combination of two or more. Among these, a photocurable compound that can be cured in a short time, for example, an ultraviolet curable compound (such as a monomer, an oligomer, or a resin that may have a low molecular weight) or an EB curable compound is preferable. In particular, a practically advantageous resin precursor is an ultraviolet curable resin. In particular, in the present invention, the photocurable compound preferably contains urethane (meth) acrylate from the viewpoint that both high antiglare properties and suppression of glare can be achieved.

  The urethane (meth) acrylate may be a urethane (meth) acrylate obtained by reacting a polyisocyanate with a (meth) acrylate having an active hydrogen atom.

  Polyisocyanates may be urethane prepolymers produced by reaction of polyisocyanates and polyols (for example, polyester polyesters, polyether polyesters, etc.) and having free isocyanate groups, but from the point of scratch resistance, Polyisocyanates are preferred.

  Examples of the polyisocyanate include aliphatic polyisocyanates, alicyclic polyisocyanates, araliphatic polyisocyanates, aromatic polyisocyanates, and polyisocyanate derivatives.

Examples of the aliphatic polyisocyanate include C _2-16 alkane diisocyanates such as tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), and trimethylhexamethylene diisocyanate. Examples of the alicyclic polyisocyanate include 1,4-cyclohexane diisocyanate, isophorone diisocyanate (IPDI), 4,4′-methylenebis (cyclohexyl isocyanate), hydrogenated xylylene diisocyanate, norbornane diisocyanate, and the like. Examples of the araliphatic polyisocyanate include xylylene diisocyanate (XDI) and tetramethyl xylylene diisocyanate. Examples of the aromatic polyisocyanate include phenylene diisocyanate, 1,5-naphthalene diisocyanate (NDI), diphenylmethane diisocyanate (MDI), tolylene diisocyanate (TDI), 4,4′-toluidine diisocyanate, and 4,4′-diphenyl ether diisocyanate. Etc. Examples of polyisocyanate derivatives include multimers such as dimers and trimers, biurets, allophanates, carbodiimides, and uretdiones. These polyisocyanates can be used alone or in combination of two or more.

Of these polyisocyanates, non-yellowing type diisocyanates or derivatives thereof, for example, aliphatic diisocyanates such as HDI, alicyclic diisocyanates such as IPDI, hydrogenated XDI, etc., because both scratch resistance and optical properties can be achieved. A non-yellowing diisocyanate or a derivative thereof such as _C4-12 alkane diisocyanate such as HDI (particularly C _5-8 alkane diisocyanate) is particularly preferable.

Examples of the (meth) acrylate having an active hydrogen atom include hydroxy C _2-6 alkyl (meth) acrylates such as 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate, and 2-hydroxy-3- Hydroxyalkoxy C _2-6 alkyl (meth) acrylates such as methoxypropyl (meth) acrylate; ditrimethylolethane tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri ( And (meth) acrylic acid partial esters of polyhydric alcohols such as (meth) acrylate and dipentaerythritol penta (meth) acrylate. These (meth) acrylates can be used alone or in combination of two or more. Of these, (meth) acrylic acid partial esters of polyhydric alcohols such as pentaerythritol tri (meth) acrylate and dipentaerythritol penta (meth) acrylate are preferred from the viewpoint of scratch resistance.

  The number of (meth) acryloyl groups in one molecule of urethane (meth) acrylate (the number of functional groups) may be 2 or more (bifunctional or more), for example, 2 to 30, preferably 3 to 25 ( For example, 5 to 20), more preferably about 8 to 18 (especially 9 to 15). If the number of the functional groups is too small, the scratch resistance may be lowered.

  The weight average molecular weight of the urethane (meth) acrylate is not particularly limited, but may be 5000 or less (for example, 500 to 5000) in terms of polystyrene in gel permeation chromatography (GPC), for example, 550 to 4000, preferably It may be about 600 to 3000, more preferably about 800 to 2000 (particularly 1000 to 1500). If the molecular weight is too large, the scratch resistance may decrease.

  The photocurable compound can be surface modified in addition to the urethane (meth) acrylate. It preferably contains a fluorine-containing curable compound (a precursor component containing a fluorine atom or a fluorine-based compound having a polymerizable group).

  Examples of the fluorine-containing curable compound include fluorides of the above monomers and oligomers, such as fluorinated alkyl (meth) acrylates [for example, perfluorooctylethyl (meth) acrylate and trifluoroethyl (meth) acrylate], fluorine (Poly) oxyalkylene glycol di (meth) acrylate [eg, fluoroethylene glycol di (meth) acrylate, fluoropolyethylene glycol di (meth) acrylate, fluoropropylene glycol di (meth) acrylate, etc.], fluorine-containing epoxy resin, fluorine Examples thereof include urethane-based resins. Of these, fluoropolyether compounds having a (meth) acryloyl group are preferred. The fluorine-containing curable compound may be a commercially available fluorine-based polymerizable leveling agent.

  The ratio of the fluorine-containing curable compound is, for example, 0.1 to 5 parts by mass, preferably 0.2 to 4 parts by mass, and more preferably 0.3 to 100 parts by mass of the curable composition (total solid content). To 3 parts by mass (particularly 0.5 to 2 parts by mass). If the ratio of the fluorine-containing curable compound is too small, the effect of promoting phase separation may be reduced, and if it is too high, the scratch resistance may be reduced.

  The cured resin precursor component may further contain a filler in order to improve the antiglare property and the scratch resistance depending on the type.

  Examples of the filler may include inorganic particles such as silica particles, titania particles, zirconia particles, and alumina particles, and organic particles such as crosslinked (meth) acrylic polymer particles and crosslinked styrene resin particles. These fillers can be used alone or in combination of two or more.

  Of these fillers, silica particles are preferable because they are excellent in optical properties and can easily form an uneven shape that can achieve both transparency and antiglare properties by spinodal decomposition. The silica particles are preferably solid silica particles because the transparency of the antiglare film can be improved.

  The shape of the filler may be an anisotropic shape, but isotropic shape is preferable, and spherical shape is particularly preferable. The average particle size of the filler is, for example, about 0.1 to 10 μm, preferably about 0.5 to 5 μm, more preferably about 0.8 to 3 μm (particularly about 1 to 2 μm).

  The ratio of a filler is 1-50 mass parts with respect to 100 mass parts of curable compositions (total solid content), Preferably it is 2-40 mass parts, More preferably, it is about 3-30 mass parts.

  The cured resin precursor component may further contain a curing agent depending on the type. For example, the thermosetting resin may contain a curing agent such as amines and polyvalent carboxylic acids, and the photocurable resin may contain a photopolymerization initiator. Examples of the photopolymerization initiator include conventional components such as acetophenones or propiophenones, benzyls, benzoins, benzophenones, thioxanthones, and acylphosphine oxides. The ratio of the curing agent such as the photopolymerization initiator is 0.1 to 20% by mass, preferably 0.5 to 10% by mass, more preferably about 1 to 8% by mass with respect to the entire cured resin precursor component. .

  The cured resin precursor component may further contain a curing accelerator. For example, the photocurable resin may contain a tertiary amine (such as a dialkylaminobenzoate ester), a phosphine photopolymerization accelerator, or the like as a photocuring accelerator.

(Combination of polymer component and cured resin precursor component)
In the present invention, among the polymer component and the cured resin precursor component, at least two components are used in a combination in which phase separation occurs near the processing temperature. Examples of combinations for phase separation include (a) a combination in which a plurality of polymer components are incompatible with each other, (b) a combination in which the polymer component and the cured resin precursor component are incompatible with each other, (C) A combination in which a plurality of cured resin precursor components are incompatible with each other and phase separated is exemplified. Among these combinations, usually, (a) a combination of a plurality of polymer components, or (b) a combination of a polymer component and a cured resin precursor component, and particularly (a) a combination of a plurality of polymer components is preferable. . When the compatibility of both of the phases to be separated is high, both do not effectively separate in the drying process for evaporating the solvent, and the function as an antiglare layer is reduced.

  Note that the polymer component and the cured resin precursor component are generally incompatible with each other. When the polymer component and the cured resin precursor component are incompatible and phase-separated, a plurality of polymer components may be used as the polymer component. When a plurality of polymer components are used, it is sufficient that at least one polymer component is incompatible with the cured resin precursor component, and other polymer components may be compatible with the cured resin precursor component. Further, it may be a combination of two polymer components that are incompatible with each other and a cured resin precursor component (in particular, a monomer or oligomer having a plurality of curable functional groups).

  When the polymer component is composed of a plurality of incompatible polymer components and phase-separated, the cured resin precursor component is compatible with at least one of the incompatible polymers at a processing temperature. Used in melting combinations. That is, when a plurality of polymer components that are incompatible with each other are constituted by, for example, a first polymer and a second polymer, the cured resin precursor component is in phase with either the first polymer or the second polymer. It may be dissolved, and may be compatible with both polymer components, but preferably it is compatible with only one polymer component. When compatible with both polymer components, at least two phases of a mixture based on the first polymer and the cured resin precursor component and a mixture based on the second polymer and the cured resin precursor component Phase separate.

  When the compatibility of the plurality of selected polymer components is high, the polymer components are not effectively separated from each other in the drying process for evaporating the solvent, and the function as an antiglare layer is reduced. The phase separation of multiple polymer components should be confirmed visually by checking whether residual solids become cloudy in the process of preparing a homogeneous solution using good solvents for both components and gradually evaporating the solvent. Can be easily determined.

  Furthermore, the refractive index of the polymer component and the cured or crosslinked resin produced by curing the cured resin precursor component are usually different from each other. In addition, the refractive indexes of the plurality of polymer components (first polymer and second polymer) are also different from each other. The difference in refractive index between the polymer component and the cured or cross-linked resin and the difference in refractive index between the plurality of polymer components (the first polymer and the second polymer) are, for example, 0.01 to 0.2, preferably 0. It may be about 05 to 0.15.

  The ratio (mass ratio) between the polymer component and the cured resin precursor component is not particularly limited, and can be selected, for example, from the range of the former / the latter = 1/99 to 95/5, for example, 2/98 to 90/10. (For example, 3/97 to 50/50), preferably 5/95 to 40/60, more preferably about 10/90 to 30/70 (especially 15/85 to 25/75). If the ratio of the polymer component is too small, the antiglare property may be lowered, and if it is too large, the scratch resistance may be lowered.

(Other ingredients)
The antiglare layer formed from the cured product of the curable composition is made of various additives such as leveling agents, stabilizers (antioxidants, UV absorbers, etc.), surfactants, water-soluble polymers, fillers. , Crosslinking agents, coupling agents, colorants, flame retardants, lubricants, waxes, preservatives, viscosity modifiers, thickeners, antifoaming agents, and the like. The ratio of an additive is about 0.01-10 mass% (especially 0.1-5 mass%) with respect to the whole glare-proof layer, for example.

(Thickness of anti-glare layer)
The thickness (average thickness) of the antiglare layer is, for example, about 1 to 20 μm, preferably 2 to 10 μm, and more preferably about 3 to 8 μm (particularly 5 to 7 μm). In addition, in this specification and a claim, the average thickness of an anti-glare layer can be calculated | required by measuring arbitrary 10 places using an optical film thickness meter, and calculating an average value.

[Base material layer]
The antiglare film of the present invention may be formed of the antiglare layer alone, or may be formed of a base material layer and an antiglare layer formed on at least one surface of the base material layer. . Among these, it is preferable to laminate an antiglare layer on one surface (only one surface) of the base material layer from the viewpoints of handleability, mechanical properties, productivity, and the like.

  The base material layer only needs to be formed of a transparent material, and can be selected according to the use, and may be an inorganic material such as glass, but an organic material is generally used from the viewpoint of strength and moldability. Examples of the organic material include cellulose derivatives, polyesters, polyamides, polyimides, polycarbonates, (meth) acrylic polymers, and the like. Among these, cellulose esters, polyesters, polycarbonates and the like are widely used, and polyesters and polycarbonates are preferable.

  Examples of the polyester include polyalkylene arylates such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN). Examples of the polycarbonate include bisphenol type polycarbonate.

Among these, poly C _2-4 alkylene-C _6-10 arylate such as PET and PEN and bisphenol A type polycarbonate are preferable from the viewpoint of excellent balance such as mechanical properties and transparency.

  The base material layer may also contain a conventional additive exemplified in the item of the antiglare layer. The ratio of the additive is the same as that of the antiglare layer.

  The substrate layer may be a uniaxial or biaxially stretched film, but may be an unstretched film because it has a low birefringence and is optically isotropic.

  The base material layer may be subjected to surface treatment (for example, corona discharge treatment, flame treatment, plasma treatment, ozone or ultraviolet irradiation treatment), and may have an easy adhesion layer.

  The thickness (average thickness) of a base material layer is 5-2000 micrometers, for example, Preferably it is 15-1000 micrometers, More preferably, it is about 20-500 micrometers.

[Characteristics of antiglare film]
Since the antiglare film of the present invention has a predetermined surface shape, it can simultaneously satisfy antiglare properties, surface slipperiness with a finger, and scratch resistance. Specifically, the arithmetic average roughness Ra of the antiglare layer surface is, for example, 0.03 to 0.3 μm, preferably 0.05 to 0.3 μm (for example, 0.06 to 0.3 μm), and more preferably 0. 0.07 to 0.25 μm (particularly 0.08 to 0.2 μm). If Ra is too small, the antiglare property may be lowered, and if it is too large, the scratch resistance may be lowered.

  The average length RSm of the roughness curve element on the surface of the antiglare layer is, for example, about 3 to 35 μm, preferably about 5 to 25 μm, and more preferably about 8 to 25 μm (particularly 10 to 25 μm). If the RSm is too small, the antiglare property may be reduced. If the RSm is too large, the scratch resistance and the slipperiness with a finger may be reduced.

  The maximum cross-sectional height Rt of the roughness curve on the surface of the antiglare layer is, for example, 0.05-2 μm (for example, 0.1-1.5 μm), preferably 0.3-1 μm, and more preferably 0.4-0. It is about 9 μm (particularly 0.5 to 0.8 μm). If Rt is too small, the antiglare property may be lowered, and if it is too large, the scratch resistance may be lowered.

  The antiglare layer surface of the present invention should satisfy the above range for two or more characteristics of Ra, RSm and Rt, but the antiglare property, surface slipperiness with fingers and scratch resistance It is preferable to satisfy the above range for all characteristics.

  In the present specification and claims, the arithmetic average roughness Ra, the average length RSm of the roughness curve element, and the maximum section height Rt of the roughness curve are in accordance with JIS B0601, and are non-contact surface / layer sections. Using a shape measurement system [“VertScan 2.0” manufactured by Ryoka System Co., Ltd.], it can be obtained based on a curve obtained by measuring the uneven shape of the surface of the antiglare layer.

  The surface of the antiglare layer is excellent in slipperiness with a finger, and was measured under the conditions of a load of 0.2 N, a moving speed of 50 mm / second, and an effective measurement distance of 50 mm using a surface contactor attached with artificial skin. The dynamic friction coefficient on the surface of the antiglare layer may be 3 or less (for example, 0.01 to 1), for example, 0.1 to 3, preferably 0.15 to 2.5, and more preferably 0.2 to 2 ( In particular, it is about 0.3-2). If the dynamic friction coefficient is too high, the slipperiness with a finger may be reduced.

  In addition, in this specification and a claim, a dynamic friction coefficient can be measured using a dynamic friction measuring machine, and can be specifically measured by the method described in the below-mentioned Example.

  The surface of the antiglare layer is excellent in scratch resistance. When the surface of the antiglare layer is reciprocated 10 times at a speed of 50 mm / second and a distance of 5 cm with steel wool # 0000 at room temperature (20 to 25 ° C.), scratches are generated. The maximum load not attached may be 50 g load or more (for example, 50 to 2000 g load), for example, 100 g load or more, preferably 200 g load or more, more preferably 500 g load or more (particularly 800 g load or more).

  In the present specification and claims, the scratch resistance can be evaluated by the method described in Examples described later.

  The antiglare film of the present invention has high transparency and excellent visibility. The haze of the antiglare film is 1 to 60%, preferably 2 to 50%, more preferably about 3 to 40% (particularly 5 to 30%). If the haze is too low, the antiglare property may be reduced. If the haze is too high, the visibility may be reduced.

  In the present specification and claims, the haze is based on JIS K7163, and the surface of the antiglare layer is a haze meter (trade name “NDH-5000W” manufactured by Nippon Denshoku Industries Co., Ltd.). It can be placed and measured to be on the light receiver side.

  The total light transmittance of the antiglare film is, for example, about 70% or more (for example, 70 to 100%), preferably 80 to 99%, and more preferably about 85 to 98% (particularly 90 to 95%). If the total light transmittance is too low, the transparency may decrease.

  In the present specification and claims, the total light transmittance can be measured using a haze meter (“NDH-5000W” manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K7361.

  The 60 ° gloss on the surface of the antiglare layer is 1 to 70%, preferably 10 to 68%, more preferably about 15 to 65%. In applications where transparency is important, the 60 ° gloss may be, for example, 30 to 70%, preferably 50 to 68%, and more preferably about 60 to 65%. In applications where antiglare properties are important, the 60 ° gloss may be, for example, 5 to 60%, preferably 10 to 50%, and more preferably about 20 to 30%. If the 60 ° gloss is too small, the visibility may be reduced, whereas if it is too large, the antiglare property may be reduced.

  In the present specification and claims, the 60 ° gloss can be measured using a gloss meter (“Polygloss KT-GL0030” manufactured by TQC Co.) in accordance with JIS K8741.

  In addition to the antiglare layer and the base material layer, the antiglare film of the present invention may be combined with an adhesive layer, a low refractive index layer, an antireflection layer and the like as a conventional functional layer.

[Production method of anti-glare film]
The method for producing the antiglare film of the present invention is not particularly limited, and can be appropriately selected according to the type of material, and may be formed by physical processing or transfer using a mold. From the point of view, a method of producing a curable composition through a curing step of curing with heat or active energy rays is preferable, and a regular surface irregular shape can be formed, and the antiglare layer having the surface irregular shape of the present invention is formed. From the point of being easy to do, it is preferable to include the anti-glare layer formation process which forms an uneven | corrugated shape by carrying out phase separation by wet spinodal decomposition.

  In the antiglare layer forming step, the wet spinodal decomposition can form irregularities on the surface by phase separation in the process of drying the liquid composition for forming the antiglare layer. When a curable composition containing one or more polymer components and one or more curable resin precursor components is used as a liquid composition for forming an antiglare layer by a wet method, the curable composition is used as a support for the support. After applying and drying on, at least two components selected from a polymer component and a cured resin precursor component are phase-separated by wet spinodal decomposition, and then the phase-separated curable composition is subjected to heat or active energy. It may be a method of curing with a wire.

  When the antiglare film is formed of the antiglare layer alone, the support may be a support capable of peeling off the antiglare layer, but a base material layer is preferable from the viewpoint of mechanical properties and the like.

  The curable composition may contain a solvent. The solvent can be selected according to the kind and solubility of the polymer component and the cured resin precursor component, and at least solid content (for example, a plurality of polymer components and cured resin precursor components, reaction initiators, other additives) is uniform. Any solvent can be used as long as it can be dissolved in the solvent. In particular, the phase separation structure may be controlled by adjusting the solubility of the solvent in the polymer component and the cured resin precursor. Examples of such solvents include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), ethers (dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), alicyclic hydrocarbons ( Cyclohexane etc.), aromatic hydrocarbons (toluene, xylene etc.), halogenated carbons (dichloromethane, dichloroethane etc.), esters (methyl acetate, ethyl acetate, butyl acetate etc.), water, alcohols (ethanol, isopropanol, Butanol, cyclohexanol, etc.), cellosolves [methyl cellosolve, ethyl cellosolve, propylene glycol monomethyl ether (1-methoxy-2-propanol), etc.], cellosolve acetates, sulfoxides (dimethylsulfate) Kishido etc.), amides (dimethylformamide, dimethylacetamide, etc.), and others. The solvent may be a mixed solvent.

Among these solvents, it is preferable to include ketones such as methyl ethyl ketone, and a mixture of ketones and alcohols (aliphatic alcohols such as butanol) and / or esters (aliphatic carboxylic acid esters such as butyl acetate). A solvent is more preferable, and a mixed solvent of ketones (particularly di-C _1-4 alkyl ketone) and alcohols (particularly C _1-6 alkanol) is most preferable. In the mixed solvent, the ratio of alcohols and / or esters (total amount when both are mixed) is, for example, 1 to 150 parts by mass (for example, 3 to 100 parts by mass), preferably 100 parts by mass of ketones, It is about 5-100 mass parts, More preferably, it is about 10-30 mass parts (especially 15-20 mass parts). In the present invention, by appropriately combining solvents, phase separation by spinodal decomposition can be adjusted, and an uneven shape that can achieve both visibility, transparency, and antiglare properties can be formed.

  The concentration of the solute (polymer component, cured resin precursor component, reaction initiator, other additives) in the mixed solution can be selected within a range where phase separation occurs and within a range where casting properties and coating properties are not impaired. It is 80 mass%, Preferably it is 10-70 mass%, More preferably, it is about 20-50 mass% (especially 30-40 mass%) grade.

  As a coating method, for example, a roll coater, an air knife coater, a blade coater, a rod coater, a reverse coater, a bar coater, a comma coater, a dip squeeze coater, a die coater, a gravure coater, a micro gravure coater, a silk screen coater. Method, dip method, spray method, spinner method and the like. Of these methods, the bar coater method and the gravure coater method are widely used. If necessary, the coating solution may be applied a plurality of times.

  After casting or coating the mixed solution, the temperature is near or lower than the boiling point of the solvent (for example, 1 to 120 ° C., preferably 5 to 50 ° C., particularly about 10 to 50 ° C. lower than the boiling point of the solvent). By evaporating the solvent, the phase separation by spinodal decomposition can be induced. The evaporation of the solvent is usually drying, for example, depending on the boiling point of the solvent, 30 to 200 ° C. (eg 30 to 150 ° C.), preferably 40 to 120 ° C., more preferably 50 to 90 ° C. (especially 60 to 85 ° C.). ) By drying at about a temperature.

  By such spinodal decomposition accompanied by evaporation of the solvent, regularity or periodicity can be imparted to the average distance between the domains of the phase separation structure.

  When the dried curable composition is finally cured by actinic rays (ultraviolet rays, electron beams, etc.) or heat, the phase separation structure formed by spinodal decomposition can be immediately immobilized. The curing of the curable composition may be combined with heating, light irradiation, or the like depending on the type of the cured resin precursor component.

  The heating temperature can be selected from an appropriate range, for example, about 50 to 150 ° C. The light irradiation can be selected according to the type of the photocuring component or the like, and usually ultraviolet rays, electron beams, etc. can be used. A general-purpose light source is usually an ultraviolet irradiation device.

As the light source, for example, in the case of ultraviolet rays, a Deep UV lamp, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a halogen lamp, a laser light source (light source such as helium-cadmium laser or excimer laser) can be used. Irradiation light amount (irradiation energy) differs by the thickness of the coating film, for example, 10 to 10000 mJ / cm ^2, preferably 20~5000mJ / cm ^2, more preferably 30~3000mJ / cm ² approximately. If necessary, the light irradiation may be performed in an inert gas atmosphere.

[Display device]
Since the antiglare film of the present invention can achieve both high antiglare property and scratch resistance, it can be used for various display devices, such as liquid crystal display devices (LCD), organic EL displays, and the like. Therefore, it is useful as a display device with a touch panel, particularly as a high-definition LCD with touch panel or an organic EL display.

  Specifically, the LCD may be a reflective LCD that uses external light to illuminate a display unit that includes a liquid crystal cell, or a transmissive LCD that includes a backlight unit that illuminates the display unit. May be. In the reflective LCD, incident light from the outside can be taken in via the display unit, and the display unit can be illuminated by reflecting the transmitted light that has passed through the display unit by the reflecting member. In the reflective LCD, the antiglare film of the present invention can be disposed in the optical path ahead of the reflective member. For example, the antiglare film of the present invention can be disposed or laminated on the front surface (viewing front surface) of the display unit, and in particular, disposed on the front surface of an LCD having a collimated backlight unit and not having a prism sheet. May be.

  In a transmissive LCD, a backlight unit allows light from a light source (a tubular light source such as a cold cathode tube or a point light source such as a light-emitting diode) to enter from one side and exit from the front exit surface. A light guide plate (for example, a light guide plate having a wedge-shaped cross section) may be provided. If necessary, a prism sheet may be provided on the front side of the light guide plate. In general, a reflection member for reflecting light from the light source toward the emission surface is disposed on the back surface of the light guide plate. In such a transmissive LCD, the antiglare film of the present invention can usually be disposed in the optical path ahead from the light source. For example, the antiglare film can be disposed or laminated on the front surface of the display unit.

  In an organic EL display, a light emitting element is configured for each pixel of the organic EL, and this light emitting element is usually a negative electrode such as a metal / electron injection layer / electron transport layer / light emitting layer / hole transport layer / It is formed of a positive electrode such as a hole injection layer / ITO / a substrate such as a glass plate or a transparent plastic plate. Also in the organic EL display, the antiglare film of the present invention may be disposed in the optical path.

  Moreover, you may utilize the anti-glare film of this invention as an aftermarket protection or protection film for preventing the touch panel LCD and the organic EL display from being damaged.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. The raw materials used in Examples and Comparative Examples are as follows, and the obtained antiglare films were evaluated by the following methods.

[material]
Acrylic resin having a polymerizable group: a compound obtained by adding 3,4-epoxycyclohexenylmethyl acrylate to a part of the carboxyl group of a (meth) acrylic acid- (meth) acrylic acid ester copolymer, manufactured by Daicel Corporation "Cyclomer P (ACA) 320M", solid content 40% by mass
Cellulose acetate propionate: “CAP-482-20” manufactured by Eastman, acetylation degree = 2.5%, propionyl degree = 46%, polystyrene-equivalent number average molecular weight 75000
Urethane acrylate A: 10 functional aliphatic urethane acrylate, average molecular weight 1200, “KRM8452” manufactured by Daicel Ornex Co., Ltd.
Urethane acrylate B: Nine functional aliphatic urethane acrylate, average molecular weight 1800, "KRM8904" manufactured by Daicel Ornex Co., Ltd.
Urethane acrylate C: 15 functional urethane acrylate, theoretical molecular weight 2300, “N-15HA” manufactured by Shin-Nakamura Chemical Co., Ltd.
Urethane acrylate D: 15 functional urethane acrylate, “U-53H” manufactured by Shin-Nakamura Chemical Co., Ltd.
Fluorine-containing UV-reactive surface modifier: “MegaFac RS-75” manufactured by DIC Corporation
Silica-containing acrylic coating liquid: Silica fine particle-containing acrylic ultraviolet curable compound, “Z-757-4RL” manufactured by Aika Industry Co., Ltd., solid content: 43% by weight
Photoinitiator: “Irgacure 907” manufactured by BASF Japan
PET film: polyethylene terephthalate film, “O321” manufactured by Mitsubishi Plastics, Inc., thickness 125 μm
PC film: polycarbonate film, “Iupilon FS-2000” manufactured by Mitsubishi Gas Chemical Co., Inc., thickness 400 μm.

[Thickness of antiglare layer]
Using an optical film thickness meter, 10 arbitrary positions were measured, and an average value was calculated.

[Haze]
In accordance with JIS K7163, using a haze meter (trade name “NDH-5000W” manufactured by Nippon Denshoku Industries Co., Ltd.), the surface of the antiglare layer was placed on the light receiver side and measured.

[Total light transmittance]
Based on JIS K7361, it measured using the haze meter (Nippon Denshoku Industries Co., Ltd. make, brand name "NDH-5000W").

[60 ° gloss]
The gloss at an angle of 60 ° was measured using a gloss meter (“Polygloss KT-GL0030” manufactured by TQC Co.) in accordance with JIS Z8741.

[Arithmetic average roughness Ra, average length RSm of roughness curve elements, maximum cross section height Rt of roughness curve]
In accordance with JIS B0601, using a non-contact surface / layer cross-sectional shape measurement system [“VertScan 2.0” manufactured by Ryoka System Co., Ltd.], the curve obtained by measuring the uneven shape of the anti-glare layer surface Based on this, the arithmetic average roughness Ra, the average length RSm of the roughness curve elements, and the maximum section height Rt of the roughness curve were determined.

[Steel Wool (SW) Resistance Test]
Using a steel wool durability tester equipped with a 1 cm diameter stick covered with steel wool # 0000, the load was changed at room temperature (20-25 ° C.) at a speed of 50 mm / sec and a distance of 5 cm. After the surface of the glare layer was rubbed back and forth 10 times, it was visually checked to determine the maximum load without any scratches.

[Anti-glare]
The lighting of a fluorescent lamp with no louver was projected on an anti-glare film, and the glare of the specular reflection light was visually confirmed and evaluated according to the following criteria. ◎: No glare felt ○: Slight glare X: I feel dazzling.

[Dynamic friction coefficient]
Using a dynamic friction coefficient measuring device ("Handy Tribomaster TL201Ts" manufactured by Trinity Labs Co., Ltd.), the frictional force at a load of 0.2 N, a speed of 50 mm / second, and an effective measurement distance of 50 mm was measured. As a surface contact, a contact made by attaching an artificial skin (“Bio Skin” manufactured by Beaulux Co., Ltd.) to a 5 mm thick sponge sheet (“Clearance Tape N-1” manufactured by Cemedine Co.) was used. The coefficient of dynamic friction was determined by sliding.

Preparation of coating liquid 1 57.7 parts by mass of an acrylic resin having a polymerizable group, 7.1 parts by mass of cellulose acetate propionate, 105.7 parts by mass of urethane acrylate A, and a fluorine group-containing UV-reactive surface modifier 1.4 Part by mass, 2.8 parts by mass of photoinitiator “Irgacure 907” (manufactured by BASF) were dissolved in a mixed solvent of 250 parts by mass of methyl ethyl ketone (MEK) and 39.2 parts by mass of 1-butanol, and coating solution 1 was dissolved. Prepared.

Preparation of Coating Liquid 2 A coating liquid 2 was prepared in the same manner as the coating liquid 1 except that urethane acrylate B was used instead of urethane acrylate A.

Preparation of coating liquid 3 A coating liquid 3 was prepared in the same manner as the coating liquid 1 except that the proportion of the acrylic resin having a polymerizable group was changed to 59.2 parts by mass.

Preparation of coating solution 4 Coating solution 4 was prepared in the same manner as coating solution 1 except that urethane acrylate C was used instead of urethane acrylate A.

Preparation of coating liquid 5 A coating liquid 5 was prepared in the same manner as the coating liquid 1 except that urethane acrylate D was used instead of urethane acrylate A.

Preparation of coating liquid 6 A coating liquid was prepared in the same manner as the coating liquid 1 except that the mixed solvent was changed to a mixed solvent of 18.61 parts by mass of MEK, 7.98 parts by mass of butyl acetate and 3.92 parts by mass of 1-butanol. 5 was prepared.

Preparation of coating liquid 7 The ratio of the acrylic resin having a polymerizable group was changed to 7.09 parts by mass, the ratio of cellulose acetate propionate was changed to 0.57 parts by mass, and the ratio of urethane acrylate C was 10.78. A coating solution 7 was prepared in the same manner as the coating solution 4 except that the amount was changed to parts by mass.

Preparation of coating liquid 8 The ratio of the acrylic resin having a polymerizable group was changed to 6.71 parts by mass, the ratio of cellulose acetate propionate was changed to 0.52 parts by mass, and the ratio of urethane acrylate A was 11.91. Coating is performed in the same manner as in the coating liquid 1 except that the mixed solvent is changed to a mixed solvent of 16.6 parts by mass of MEK, 3.92 parts by mass of 1-butanol and 10.74 parts by mass of butyl acetate. Liquid 8 was prepared.

Preparation of coating liquid 9 A coating liquid 9 was prepared in the same manner as the coating liquid 4 except that the ratio of cellulose acetate propionate was changed to 0.76 parts by mass.

Preparation of coating solution 10 The coating solution 10 was prepared by mixing the coating solution 4 and the silica-containing acrylic coating solution so that the former / the latter = 40/60 in terms of solid mass ratio.

Examples 1-6 and Comparative Examples 1-3
Each coating solution was coated on a PET film using a wire bar and dried in an oven at 80 ° C. for 1 minute to form a 6 μm thick coating film. Subsequently, the coating film was irradiated with ultraviolet rays from a high-pressure mercury lamp (manufactured by Eye Graphics Co., Ltd.) for about 10 seconds, the coating film was cured, an antiglare layer was formed, and an antiglare film was obtained.

Example 7
An antiglare film was obtained in the same manner as in Examples 1 to 6 and Comparative Examples 1 to 3, except that a PC film was used instead of the PET film and the coating liquid 10 was coated.

  Table 1 shows the evaluation results of the antiglare films obtained in Examples and Comparative Examples.

  As is clear from the results in Table 1, the antiglare films of the examples have a low coefficient of dynamic friction, good slipperiness with fingers, and can also improve scratch resistance and antiglare properties. On the other hand, the antiglare film of the comparative example has low scratch resistance.

  The antiglare film of the present invention is used for various display devices such as LCDs, cathode ray tube display devices, organic or inorganic EL displays, field emission displays (FEDs), surface electric field displays (SEDs), rear projection television displays, etc. It can be used as an anti-glare film for use in a device, and in particular, it has excellent slipperiness and scratch resistance with a finger, so that it can be used for a display for car navigation, a game machine, a smartphone, a personal computer (PC) (tablet PC, notebook type or (Laptop type PC, desktop type PC, etc.) and a display device with a touch panel such as a television.

Claims (11)

An antiglare film having an antiglare layer on its surface, having a haze of 1 to 60%, a 60 ° gloss on the surface of the antiglare layer of 0.1 to 70%, and an uneven shape on the surface of the antiglare layer An antiglare film satisfying at least two of the properties (1) to (3).
(1) Arithmetic average roughness Ra is 0.05 to 0.25 μm (2) Average length RSm of roughness curve element is 5 to 25 μm (3) Maximum cross section height Rt of roughness curve is 0 .1 to 1 μm   The anti-glare film according to claim 1, which satisfies all of the characteristics (1) to (3).   The dynamic friction coefficient of the surface of the antiglare layer measured by using a surface contact with affixed artificial skin under conditions of a load of 0.2 N, a moving speed of 50 mm / second, and an effective measurement distance of 50 mm is 3 or less. The antiglare film as described.   The antiglare film according to any one of claims 1 to 3, wherein the antiglare layer is a cured product of a curable composition containing at least one polymer component and at least one cured resin precursor component.   5. The prevention according to claim 4, wherein the polymer component comprises cellulose esters and / or a (meth) acrylic polymer which may have a polymerizable group, and the cured resin precursor component comprises urethane (meth) acrylate. Dazzle film.   The antiglare film according to claim 5, wherein the number of (meth) acryloyl groups in one molecule of urethane (meth) acrylate is 5 to 20.   The anti-glare film according to any one of claims 4 to 6, wherein the cured resin precursor component further contains a fluorine-based compound having a polymerizable group.   The antiglare film according to any one of claims 4 to 7, wherein the curable composition further comprises a filler.   The manufacturing method of the anti-glare film in any one of Claims 1-8 including the anti-glare layer formation process of making it phase-separate by wet spinodal decomposition | disassembly and forming an uneven | corrugated shape.   A display device comprising the antiglare film according to claim 1.   The display device according to claim 10, which is a liquid crystal display device with a touch panel or an organic EL display.