JP2009169409A - Anti-glare film, anti-glare polarizing plate and image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-glare film exhibiting excellent anti-glare performance, preventing reduction in visibility due to haze, and exhibiting a high contrast while preventing glare when placed in a high-definition image display apparatus, and to provide an anti-glare polarizing plate and an image display apparatus using the anti-glare film. <P>SOLUTION: The anti-glare film includes a resin base film 101a and a hard coat layer 102a arranged on the surface of the resin base film and having a surface with fine irregularities. The resin base film 101a has a multilayer structure including a transparent resin layer 103a composed of a transparent resin and a light diffusion layer 104a containing a transparent binder resin and fine particles 105a having a refractive index different from that of the transparent binder resin. The resin base film 101a has an internal haze value of not less than 5% but not more than 30%. The hard coat layer 102 includes a translucent resin in which translucent particles 106a are dispersed, and has a surface haze value of not less than 0.5% but not more than 15% and an internal haze value of not more than 2%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is not anti-glare while exhibiting excellent anti-glare performance, does not cause glare when applied to an image display device, exhibits high contrast, and provides good visibility, an anti-glare film. In addition, the present invention relates to an antiglare polarizing plate and an image display device using the antiglare film.

  In an image display device such as a liquid crystal display, a plasma display panel, a cathode ray tube (CRT) display, and an organic electroluminescence (EL) display, the visibility is significantly impaired when external light is reflected on the display surface. Conventionally, in order to prevent such reflection of external light, televisions and personal computers that emphasize image quality, video cameras and digital cameras that are used outdoors with strong external light, and mobile phones that display using reflected light In a telephone or the like, a film layer for preventing external light from being reflected is provided on the surface of an image display device. For this film layer, anti-reflection processing technology using interference by optical multilayer film and anti-glare processing technology that blurs the reflected image by scattering incident light by forming fine irregularities on the surface are generally used. ing. In particular, the latter technique of scattering incident light by forming fine irregularities can be manufactured at a relatively low cost, and is therefore widely used in applications such as large monitors and personal computers.

  Conventionally, such an antiglare film, for example, a resin solution in which a filler is dispersed is applied on a base sheet, and the coating film thickness is adjusted so that the filler is exposed on the surface of the coating film. It is manufactured by a method of forming on a sheet. There is also an attempt to develop anti-glare properties using only fine irregularities formed on the surface of the transparent resin layer without containing a filler. For example, in Patent Document 1 (Claims 1 to 6, paragraphs 0043 to 0046), the ionizing radiation curable resin is cured in a state where the ionizing radiation curable resin is sandwiched between the embossing mold and the transparent resin film. On the transparent resin film, the three-dimensional 10-point average roughness and the average distance between adjacent convex portions on the three-dimensional roughness reference surface form fine irregularities satisfying predetermined values, respectively. An antiglare film in which a cured product layer of an ionizing radiation curable resin layer having surface irregularities is laminated is disclosed. However, when such a conventional anti-glare film is arranged on the surface of the image display device, there is a problem that the entire display surface becomes whitish due to scattered light and the display becomes cloudy, so-called whitening is likely to occur. It was.

In addition, when the image display device is high-definition, the pixel of the image display device and the surface uneven shape of the antiglare film interfere with each other. There was a problem. In order to eliminate glare, there is an attempt to scatter light by providing a difference in refractive index between the binder resin and the dispersion filler. However, when such an antiglare film is applied to an image display device, the scattered light As a result, the luminance of black display is increased, resulting in a problem that the contrast is lowered and the visibility is remarkably lowered. In addition, in the antiglare film in which the surface unevenness shape is formed by such a filler, the surface unevenness shape for scattering incident light and the region mainly responsible for the internal scattering of light are simultaneously formed. In addition to designing with a balance between the particle size, concentration, refractive index, and dispersibility of the dispersed particles, precise control is necessary in production, but such design and control is practically difficult. As an attempt to avoid such complicated design and control, Patent Document 2 discloses that the formation of the resin layer having the internal scattering function of light and the formation of the uneven surface shape are performed separately. In the method of coating by dispersing in a resin solution, there is a problem that unexpected aggregation or the like is likely to occur during the drying process.
JP 2002-189106 A JP 2007-101912 A

  The present invention has been made in view of the current situation, and its purpose is to provide excellent anti-glare performance, while preventing a decrease in visibility due to whitishness, and placing it on the surface of a high-definition image display device. Sometimes, an antiglare film that exhibits high contrast without causing glare is provided, and further, an antiglare polarizing plate and an image display device to which the antiglare film is applied.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors constituted a resin film as a base material from a multilayer structure of at least two layers, and among the layers constituting the resin base film Using a resin film containing fine particles having a refractive index different from the refractive index of the binder resin in at least one layer, a hard coat layer having an extremely small internal haze and a fine uneven shape on the surface of the resin film If it is formed, it is possible to completely separate the control of the internal scattering of the light and the provision of the surface uneven shape, and as a result, the glare is sufficiently prevented and the contrast when applied to the image display device is reduced. It has been found that an antiglare film that hardly decreases is obtained. The present invention has been completed based on such findings and further various studies.

  That is, the antiglare film according to the present invention is an antiglare film comprising a resin base film and a hard coat layer having a fine uneven shape on the surface, laminated on the surface of the resin base film. The base film has a multilayer structure including at least one transparent resin layer made of a transparent resin, and at least one light diffusion layer containing a transparent binder resin and fine particles having a refractive index different from that of the transparent binder resin. Here, the internal haze of the resin base film is 5% or more and 30% or less. The hard coat layer is made of a translucent resin in which at least one kind of translucent fine particles are dispersed. The surface haze of the hard coat layer is 0.5% or more and 15% or less, and the internal haze is 2 % Or less.

  In the antiglare film of the present invention, the internal haze of the resin base film is preferably 10% or more and 25% or less, and the surface haze of the hard coat layer having a fine uneven shape is preferably 0.5% or more and 5% or less. .

  The hard coat layer constituting the antiglare film of the present invention is preferably made of a translucent resin in which silica-based fine particles are dispersed or a translucent resin in which resin fine particles are dispersed. The weight average particle diameter of the silica-based fine particles is preferably 1 μm or more and 5 μm or less, and may be contained in the range of 1 part by weight or more and 5 parts by weight or less with respect to 100 parts by weight of the translucent resin. preferable. When resin fine particles are used, the difference in refractive index between the translucent resin and the resin fine particles is preferably 0.01 or less. The weight average particle diameter of the resin fine particles is preferably 2 μm or more and 10 μm or less, and is preferably contained in the range of 1 part by weight or more and 15 parts by weight or less with respect to 100 parts by weight of the translucent resin. .

  In one preferable embodiment of the present invention, the resin base film has a two-layer structure of one transparent resin layer and one light diffusion layer laminated on the surface of the transparent resin layer. In this case, the hard coat layer is disposed on the surface of the light diffusion layer opposite to the transparent resin layer side.

  In another preferred embodiment of the present invention, the resin base film has a three-layer structure of two transparent resin layers and a light diffusion layer disposed between the two transparent resin layers.

  The thickness of the resin base film is preferably 30 μm or more and 250 μm or less, and the thickness of the hard coat layer having a fine uneven shape is preferably 2 μm or more and 20 μm or less. Moreover, it is preferable that both the transparent resin which comprises a transparent resin layer, and the transparent binder resin which comprises a light-diffusion layer are acrylic resins.

  The fine particles contained in the light diffusion layer have a weight average particle diameter of 4 μm or more and 20 μm or less, and the refractive index difference from the transparent binder resin also contained in the light diffusion layer is 0.01 or more and less than 0.02. The resin particles are preferably contained within a range of 5 to 20 parts by weight with respect to 100 parts by weight of the transparent binder resin.

  In the antiglare film of the present invention, the relative scattered light intensity T (20) in the normal direction of the hard coat layer side when light is incident at an incident angle of 20 ° from the resin base film side is 0.0001% or more. The relative scattered light intensity T (30) in the normal direction of the hard coat layer side when light is incident at an incident angle of 30 ° from the resin base film side is 0.00004% or more and 0.0002. % Or less is preferable. Further, when light is incident from the hard coat layer side at an incident angle of 30 °, the reflectance R (30) at a reflection angle of 30 ° is 0.05% or more and 2% or less, and the reflectance R at a reflection angle of 40 °. (40) is preferably 0.0001% or more and 0.005% or less, and the reflectance R (50) at a reflection angle of 50 ° is preferably 0.00001% or more and 0.0005% or less.

  The antiglare film of the present invention may further have a low reflection film on the uneven surface of the hard coat layer.

  According to the present invention, there is also provided an antiglare polarizing plate obtained by laminating the antiglare film described above and a polarizing film, and the polarizing film is disposed on the resin base film side of the antiglare film. An antiglare polarizing plate is provided.

  The antiglare film or antiglare polarizing plate of the present invention can be combined with an image display element such as a liquid crystal display element or a plasma display panel to form an image display device. That is, according to the present invention, the antiglare film according to any one of the above or the antiglare polarizing plate and an image display element are provided, and the antiglare film or the antiglare polarizing plate has a hard coat layer side. An image display device is provided that is disposed on the outside of the image display element on the viewing side.

  The anti-glare film of the present invention has excellent anti-glare performance, prevents deterioration of visibility due to whitening, and does not cause glare when placed on the surface of a high-definition image display device. Can exhibit high contrast. The anti-glare polarizing plate obtained by combining the anti-glare film of the present invention with a polarizing film also exhibits the same effect. And the image display apparatus which has arrange | positioned the anti-glare film or anti-glare polarizing plate of this invention has high anti-glare performance, and becomes what was excellent in visibility.

<Anti-glare film>
FIG. 1 is a schematic cross-sectional view showing a preferred example of the antiglare film of the present invention. The antiglare film shown in FIG. 1 (a) includes a resin base film 101a and a hard coat layer 102a having a fine concavo-convex shape laminated on the surface of the resin base film 101a. The hard coat layer 102a is formed by dispersing translucent fine particles 106a in a translucent resin. The resin base film 101a has a three-layer structure including two transparent resin layers 103a and a light diffusion layer 104a disposed between the two transparent resin layers 103a. In the light diffusion layer 104a, fine particles 105a having a refractive index different from that of the transparent binder resin serving as a base material of the light diffusion layer 104a are dispersed. The antiglare film shown in FIG. 1B includes a resin base film 101b and a hard coat layer 102b having a fine uneven shape on the surface laminated on the surface of the resin base film 101b. The hard coat layer 102b is formed by dispersing translucent fine particles 106b in a translucent resin. The resin base film 101b has a two-layer structure of one transparent resin layer 103b and one light diffusion layer 104b laminated on the surface of the transparent resin layer 103b. The hard coat layer 102b is disposed on the surface of the light diffusion layer 104b opposite to the transparent resin layer 103b side. Further, in the light diffusion layer 104b, fine particles 105b having a refractive index different from that of the transparent binder resin serving as the base material of the light diffusion layer 104b are dispersed.

  As shown by the above preferred examples, the antiglare film of the present invention comprises a resin base film and a hard coat layer having a fine irregular surface laminated on the resin base film surface, And while giving the internal scattering function to the resin base film, the internal scattering function is eliminated or almost eliminated from the hard coat layer, and only the surface reflection property is mainly given. With this configuration, it is possible to independently control the internal scattering characteristics and the reflection characteristics, and while preventing excellent glare-proof performance, deterioration in visibility due to whitening is prevented, and a high-definition image display device When it is arranged on the surface, an antiglare film that expresses high contrast without causing glare can be easily obtained. Hereinafter, the resin base film and the hard coat layer will be described in detail.

(Resin base film)
The resin base film has a multilayer structure including at least one transparent resin layer made of a transparent resin and at least one light diffusion layer containing a transparent binder resin and fine particles having a refractive index different from that of the transparent binder resin. The internal haze is 5% or more and 30% or less. Here, the “internal haze” of the resin base film means that one side of the resin base film is bonded to a glass substrate using an optically transparent adhesive or glycerin, and then the other side. A resin base film in which a triacetyl cellulose film having a haze of almost 0 is bonded using an optically transparent adhesive or glycerin and sandwiched between the glass substrate and the triacetyl cellulose film is shown in JIS K 7136. Defined as haze measured according to the method. In this way, by being sandwiched between the glass substrate and the triacetyl cellulose film, the warpage of the resin base film is prevented and the haze due to the surface shape of the resin base film is not taken into account. The internal haze of the film will be measured.

  The internal haze of the resin base film is 5% or more, preferably 10% or more. By setting the internal haze to 5% or more, glare can be eliminated, and by setting it to 10% or more, glare can be more effectively eliminated. The internal haze of the resin base film is 30% or less. If the haze of the resin base film exceeds 30%, when applied to an image display device, the screen becomes dark as a result, and the visibility tends to be impaired. In order to ensure sufficient brightness, the internal haze is preferably 25% or less, and more preferably 20% or less. As will be described in detail later, in the antiglare film of the present invention, since the resin base film has an antiglare property due to scattering, the internal haze of the hard coat layer having a fine uneven shape is essential. In order to control the internal scattering characteristic and the reflection characteristic independently, it is preferable to set it to substantially zero.

  For the transparent resin used for the transparent resin layer constituting the resin base film and the transparent binder resin used for the light diffusion layer, a substantially optically transparent resin is used. Examples of such resins include acrylic resins such as triacetyl cellulose, polyethylene terephthalate, and polymethyl methacrylate, polycarbonate resins, and thermoplastic resins such as amorphous cyclic polyolefins that contain norbornene compounds as monomers. it can. The transparent resin constituting the transparent resin layer and the transparent binder resin used for the light diffusion layer may be the same or different materials. Among these resins, it is preferable to use an acrylic resin that is excellent in transparency and weather resistance and has a high surface hardness. Here, the acrylic resin in the present invention means a material obtained by mixing a methacrylic resin, an additive added as necessary, etc., and melt-kneading.

  The methacrylic resin is a polymer mainly composed of methacrylic acid ester. The methacrylic resin may be a homopolymer of one kind of methacrylic acid ester or a copolymer of methacrylic acid ester with other methacrylic acid ester or acrylic acid ester. Examples of the methacrylic acid esters include alkyl methacrylates such as methyl methacrylate, ethyl methacrylate, and butyl methacrylate, and the alkyl group usually has about 1 to 4 carbon atoms. The acrylic ester that can be copolymerized with the methacrylic ester is preferably an alkyl acrylate, such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and the like. The number of carbon atoms in the group is usually about 1-8. In addition to these, the copolymer contains an aromatic vinyl compound such as styrene which is a compound having at least one polymerizable carbon-carbon double bond in the molecule, a vinyl cyanide compound such as acrylonitrile, and the like. Also good.

  The acrylic resin preferably contains acrylic rubber particles from the viewpoint of impact resistance and film forming property of the film. The amount of acrylic rubber particles that can be contained in the acrylic resin is preferably 5% by weight or more, more preferably 10% by weight or more. The upper limit of the amount of the acrylic rubber particles is not critical, but if the amount of the acrylic rubber particles is too large, the surface hardness of the film is lowered, and when the film is subjected to surface treatment, it is resistant to the organic solvent in the surface treatment agent. Solvent property decreases. Therefore, the amount of acrylic rubber particles that can be contained in the acrylic resin is preferably 80% by weight or less, and more preferably 60% by weight or less.

  The acrylic rubber particles are particles containing an elastic polymer mainly composed of an acrylate ester as an essential component. The acrylic rubber particles may have a single-layer structure consisting essentially only of the elastic polymer. It may have a multi-layer structure in which the coalescence is one layer. Specifically, as this elastic polymer, 50 to 99.9% by weight of an alkyl acrylate and at least one kind of other vinyl monomer copolymerizable therewith, 0 to 49.9% by weight, A cross-linked elastic copolymer obtained by polymerization of a monomer comprising 0.1 to 10% by weight of a polymerizable cross-linkable monomer is preferably used.

  Examples of the alkyl acrylate include methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and the like, and the alkyl group usually has about 1 to 8 carbon atoms. Examples of the other vinyl monomers copolymerizable with the alkyl acrylate include compounds having one polymerizable carbon-carbon double bond in the molecule. Examples thereof include methacrylic acid esters such as methyl acid, aromatic vinyl compounds such as styrene, vinylcyan compounds such as acrylonitrile, and the like. Examples of the copolymerizable crosslinkable monomer include a crosslinkable compound having at least two polymerizable carbon-carbon double bonds in the molecule. (Meth) acrylates of polyhydric alcohols such as (meth) acrylate and butanediol di (meth) acrylate, alkenyl esters of (meth) acrylic acid such as allyl (meth) acrylate and methallyl (meth) acrylate, divinyl Examples include benzene. In this specification, (meth) acrylate refers to methacrylate or acrylate, and (meth) acrylic acid refers to methacrylic acid or acrylic acid.

  Further, since the processability of the film is good, a polycarbonate resin is also preferably used as the transparent binder resin constituting the light diffusion layer. Here, the polycarbonate resin refers to an aromatic polycarbonate. For example, a polycarbonate resin is a method in which a dihydric phenol and a carbonate precursor are reacted by an interfacial polycondensation method or a melt transesterification method; a method in which a carbonate prepolymer is polymerized by a solid phase transesterification method; It can be obtained by a method of polymerizing by a ring-opening polymerization method.

  Representative examples of the dihydric phenol include hydroquinone, resorcinol, 4,4′-dihydroxydiphenyl, bis (4-hydroxyphenyl) methane, bis {(4-hydroxy-3,5-dimethyl) phenyl} methane, 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 2,2-bis (4-hydroxyphenyl) propane (commonly called bisphenol A), 2, 2-bis {(4-hydroxy-3-methyl) phenyl} propane, 2,2-bis {(4-hydroxy-3,5-dimethyl) phenyl} propane, 2,2-bis {(4-hydroxy-3 , 5-Dibromo) phenyl} propane, 2,2-bis {(3-isopropyl-4-hydroxy) phenyl} propane, 2,2-bi {(4-hydroxy-3-phenyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4 -Hydroxyphenyl) -3,3-dimethylbutane, 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 2,2-bis (4-hydroxyphenyl) pentane, 2,2-bis (4-hydroxy) Phenyl) -4-methylpentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -4-isopropylcyclohexane, 1,1-bis (4-hydroxyphenyl)- 3,3,5-trimethylcyclohexane, 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis {(4-H Roxy-3-methyl) phenyl} fluorene, α, α′-bis (4-hydroxyphenyl) -o-diisopropylbenzene, α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene, α, α ′ -Bis (4-hydroxyphenyl) -p-diisopropylbenzene, 1,3-bis (4-hydroxyphenyl) -5,7-dimethyladamantane, 4,4'-dihydroxydiphenylsulfone, 4,4'-dihydroxydiphenylsulfoxide 4,4′-dihydroxydiphenyl sulfide, 4,4′-dihydroxydiphenyl ketone, 4,4′-dihydroxydiphenyl ether, and 4,4′-dihydroxydiphenyl ester. These dihydric phenols can be used alone or in admixture of two or more.

  Among them, bisphenol A, 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl)- 3-methylbutane, 2,2-bis (4-hydroxyphenyl) -3,3-dimethylbutane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1-bis (4-hydroxyphenyl) ) A homopolymer or copolymer obtained from at least one dihydric phenol selected from the group consisting of 3,3,5-trimethylcyclohexane and α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene. Polymers are preferred, especially bisphenol A homopolymers and 1,1-bis (4-hydroxyphenyl) -3,3,5- At least one selected from trimethylcyclohexane and bisphenol A, 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane and α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene A copolymer with a dihydric phenol is preferably used.

  As the carbonate precursor, carbonyl halide, carbonate ester, haloformate or the like is used, and specific examples include phosgene, diphenyl carbonate, dihaloformate of dihydric phenol, and the like.

  For the transparent resin used for the transparent resin layer and the transparent binder resin used for the light diffusion layer, conventional additives such as ultraviolet absorbers, organic dyes, pigments, inorganic dyes, antioxidants, antistatic agents, A surfactant or the like may be contained. Among these, an ultraviolet absorber is preferably used for improving weather resistance. Examples of the ultraviolet absorber include 2,2′-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol], 2- (5 -Methyl-2-hydroxyphenyl) -2H-benzotriazole, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (3,5-di -Tert-butyl-2-hydroxyphenyl) -2H-benzotriazole, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chloro-2H-benzotriazole, 2- (3,5 -Di-tert-butyl-2-hydroxyphenyl) -5-chloro-2H-benzotriazole, 2- (3,5-di-tert-amyl-2-hydroxypheny ) Benzotriazole ultraviolet absorbers such as -2H-benzotriazole, 2- (2'-hydroxy-5'-tert-octylphenyl) -2H-benzotriazole; 2-hydroxy-4-methoxybenzophenone, 2- Hydroxy-4-octyloxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxy-4'-chlorobenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4, Examples include 2-hydroxybenzophenone ultraviolet absorbers such as 4′-dimethoxybenzophenone; salicylic acid phenyl ester ultraviolet absorbers such as p-tert-butylphenyl salicylic acid ester and p-octylphenyl salicylic acid ester. It may be used two or more thereof. When the acrylic resin contains an ultraviolet absorber, the amount is usually 0.1% by weight or more, preferably 0.3% by weight or more, and preferably 2% by weight or less.

  Fine particles dispersed in the light diffusion layer are inorganic particles such as calcium carbonate, barium sulfate, titanium oxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide, zinc oxide, and fatty acids in these inorganic particles. Inorganic particles such as those that have been surface-treated may be used, but inorganic particles generally have a large particle size distribution and are not easily dispersed in a transparent binder resin. It is preferable to use resin particles because the difference in refractive index between the two tends to decrease the light transmittance. The refractive index of the fine particles needs to have a value different from the refractive index of the transparent binder resin in order to provide a light diffusion function, and the refractive index difference between the two is 0.01 or more. Is preferred. In order to ensure an appropriate internal haze value, it is preferable not to make this difference in refractive index very large. For example, the difference in refractive index between the two is preferably less than 0.02. The refractive index of the fine particles is appropriately selected in consideration of the type of the transparent binder resin to be used and the like, but when using the transparent binder resin as described above, the refractive index of the fine particles is 1.43 or more and 1.6 or less. It is preferable to select from a range. When the acrylic resin is used as the transparent binder resin, the refractive index of the fine particles is from about 1.47 to 1.51 because the refractive index of the acrylic resin is generally about 1.49. Preferably, the selection is made so as to satisfy the above conditions. Moreover, when using polycarbonate-type resin for transparent binder resin, since the refractive index of polycarbonate-type resin is about 1.58, the refractive index of microparticles | fine-particles is in the range of about 1.56-1.6, It is preferable to select so as to satisfy the conditions.

  The fine particles are preferably spherical or almost spherical considering the isotropic and uniformity of scattering. Also, particles having a surface with fine irregularities and amorphous particles are not preferred because unexpected scattering may occur due to structures such as fine irregularities on the surface smaller than the particle size. . The weight average particle diameter of the fine particles is preferably 4 μm or more and 20 μm or less, and more preferably 5 μm or more and 12 μm or less. When the weight average particle diameter of the fine particles is less than 4 μm, the scattered light intensity on the wide angle side increases, and as a result, when applied to an image display device, the contrast tends to decrease. Moreover, when the weight average particle diameter exceeds 20 μm, the required scattering effect may not be obtained, or it may be necessary to increase the thickness of the resin base film in order to obtain the required scattering effect.

  Specific examples of the fine particles preferably used include spherical or nearly spherical resin beads. Examples of suitable resin beads include melamine beads (refractive index 1.57), polymethyl methacrylate beads (refractive index). 1.49), methyl methacrylate / styrene copolymer resin beads (refractive index 1.50 to 1.59), polycarbonate beads (refractive index 1.59), polyethylene beads (refractive index 1.53), polychlorinated Examples thereof include vinyl beads (refractive index 1.46) and silicone resin beads (refractive index 1.46).

  In the light diffusion layer, the fine particles are preferably contained in an amount of 5 to 20 parts by weight with respect to 100 parts by weight of the transparent binder resin. If the content of the fine particles is less than 5 parts by weight, uniform and sufficient internal scattering cannot be obtained, and glare tends to occur when an antiglare film is obtained. On the other hand, if the content of fine particles exceeds 20 parts by weight, internal scattering increases, resulting in high haze, the screen becomes dark when applied to an image display device, and visibility is impaired. The scattered light intensity on the side also rises and tends to lower the contrast when applied to an image display device.

  The thickness of the resin base film is preferably 30 μm or more and 250 μm or less, and more preferably 40 μm or more and 170 μm or less. When the thickness of the resin base film is less than 30 μm, it may be difficult to obtain sufficient scattering characteristics required in the present invention. Moreover, it is not preferable that the thickness of the resin base film exceeds 250 μm from the viewpoint of the recent demand for thinning of the image display device and the cost. From the viewpoint of reducing the thickness of the entire antiglare film, it is more preferably 150 μm or less, and further preferably 120 μm or less. The thickness of the transparent resin layer is not particularly limited, but can be, for example, 10 μm or more and 50 μm or less, and preferably 15 μm or more and 40 μm or less. The thickness of the light diffusion layer is not particularly limited, but can be, for example, 20 μm or more and 150 μm or less, and preferably 30 μm or more and 90 μm or less.

  The resin composition used for forming the light diffusion layer can be obtained by mixing the transparent binder resin (for example, methacrylic resin, acrylic rubber particles and other additives) and the fine particles, and melt-kneading them. .

  As a method for obtaining the resin base film used in the present invention from the resin composition containing the transparent resin constituting the transparent resin layer and the fine particles constituting the light diffusion layer, for example, a method using a feed block, a multi-layer Various generally known methods such as a method using a manifold die can be used. Among them, for example, a method of laminating via a feed block, multilayer melt extrusion from a T-die, and forming a film by bringing at least one surface of the obtained laminated film into contact with a roll or a belt is a film having good surface properties. It is preferable at the point obtained. In particular, from the viewpoint of improving the surface smoothness and surface glossiness of the resin base film, a method of forming a film by bringing both surfaces of the laminated film obtained by the multilayer melt extrusion molding into contact with the roll surface or the belt surface Is preferred. In the roll or belt used in this case, the surface of the roll or belt in contact with the transparent resin constituting the transparent resin layer is preferably a mirror surface for imparting smoothness to the film surface.

  The resin base film can have a three-layer structure in which a light diffusion layer is sandwiched between two transparent resin layers, as shown in FIG. 1 (a), or as shown in FIG. 1 (b). A two-layer structure comprising a transparent resin layer and a light diffusion layer laminated thereon can also be used. Of these, a three-layer structure as shown in FIG. In the case of a two-layer structure, the surface of the light diffusion layer is exposed on either side of the resin base film, the surface smoothness is deteriorated, and the micro uneven shape of the hard coat layer is unexpectedly affected. This is because there is a possibility that inconveniences such as air bubbles may occur when the liquid crystal is applied to the image display device. In addition, it is possible to obtain a resin base film composed of a laminate of three or more layers by alternately arranging transparent resin layers and light diffusion layers so that the surface of the light diffusion layer is not exposed. In view of the above, a three-layer structure is preferable.

(Hard coat layer)
The hard coat layer having a fine concavo-convex shape on the surface used for the antiglare film of the present invention is laminated on the surface of the resin base film, and is a transparent material in which at least one kind of translucent fine particles are dispersed. It consists of a light-sensitive resin (hard coat resin). In the present invention, the surface haze of the hard coat layer is 0.5% or more and 15% or less, and the internal haze is 2% or less. Here, the surface haze and internal haze of the hard coat layer are measured as follows. That is, first, the hard coat layer is formed on a triacetyl cellulose film having a haze of approximately 0%, and then the laminated film and the glass substrate are bonded to the transparent adhesive so that the triacetyl cellulose film side becomes the bonding surface. The haze is measured according to JIS K 7136. The haze corresponds to the haze of the entire hard coat layer. Next, a triacetyl cellulose film having a haze of almost 0 is bonded to the concavo-convex surface of the hard coat layer using glycerin, and the haze is measured again in accordance with JIS K 7136. The haze can be regarded as “internal haze” of the hard coat layer because the surface haze caused by the surface irregularities is almost canceled by the triacetyl cellulose film bonded onto the surface irregularities. Therefore, the “surface haze” of the hard coat layer is obtained from the following formula (1).

  Surface haze = Overall haze-Internal haze (1)

  As described above, in the present invention, in order to control the internal scattering characteristics and the reflection characteristics independently, the internal scattering characteristics are mainly imparted to the resin base film, so the internal haze of the hard coat layer is 2 % Or less. When the internal haze of the hard coat layer is substantially 0%, the entire haze of the hard coat layer is substantially composed of only the surface haze. The surface haze of the hard coat layer is 15% or less from the viewpoint of suppressing whitening, and is preferably 5% or less in order to suppress whitening more effectively. However, when it is less than 0.5%, it is not preferable because sufficient antiglare property is not exhibited.

  In the present invention, the hard coat layer provided with surface irregularities satisfying the above-described optical characteristics is formed using at least one kind of translucent fine particles and translucent resin. More specifically, such a hard coat layer, for example, by applying a translucent resin solution in which translucent fine particles as a filler are dispersed on a resin base film, adjusting the coating film thickness, It can be formed by making the part of the translucent fine particles convex. In the present invention, “translucency” means that light can be transmitted almost regardless of the presence or absence of scattering inside the substance.

  As the light-transmitting fine particles dispersed in the hard coat layer, silica-based fine particles or resin fine particles are preferably used in order to make the internal haze of the hard coat layer 2% or less. As a preferred example of the silica-based fine particles, there can be mentioned porous silica secondary particles in which amorphous silica whose primary particle size is smaller than the wavelength of visible light (about 100 nm or less) is aggregated to some extent. As such porous silica particles, commercially available “Silicia”, “Silo Hovic” (both manufactured by Fuji Silysia Chemical Co., Ltd.) and the like can be suitably used.

  The weight-average particle diameter of the silica-based fine particles (as in the state of being secondary particles as described above) is preferably 1 μm or more and 5 μm or less, and more preferably 2 μm or more and 4 μm or less. When the weight average particle diameter is less than 1 μm, there is a tendency that sufficient antiglare properties are not exhibited. When the weight average particle diameter exceeds 5 μm, the surface haze increases, and as a result, the antiglare film is formed. There is a tendency for visibility to deteriorate due to whiteness.

  The silica-based fine particles are preferably contained in the hard coat layer within a range of 1 part by weight or more and 5 parts by weight or less with respect to 100 parts by weight of the translucent resin. More preferably, it is contained in the range of 2 parts by weight or more and 5 parts by weight or less with respect to 100 parts by weight of the translucent resin. When the content of the silica-based fine particles is less than 1 part by weight, there is a tendency that sufficient anti-glare properties are not exhibited or the surface unevenness is sparse and the texture is lowered. Moreover, when content of a silica type fine particle exceeds 5 weight part, surface haze becomes large and, as a result, there exists a tendency for an anti-glare film to become white and for visibility to fall.

  When resin fine particles are used as the light-transmitting fine particles forming the hard coat layer, the refractive index of the resin fine particles and the light-transmitting material serving as the base material of the hard coat layer are used so that the internal haze of the hard coat layer is 2% or less. It is preferable to select resin fine particles such that the difference in refractive index of the functional resin (hard coat resin) is 0.01 or less. Since the translucent resin is often selected from resins having a refractive index of around 1.50, examples of the resin fine particles having a refractive index difference of 0.01 or less include polymethyl methacrylate. Examples thereof include beads (refractive index 1.49), methyl methacrylate / styrene copolymer resin beads (refractive index 1.50 to 1.59), polyethylene beads (refractive index 1.53), and the like.

  The weight average particle diameter of the resin fine particles is preferably 2 μm or more and 10 μm or less, and more preferably 4 μm or more and 8 μm or less. When the weight average particle diameter is less than 2 μm, there is a tendency that sufficient antiglare properties are not exhibited. When the weight average particle diameter exceeds 10 μm, the surface haze increases, and as a result, an antiglare film is obtained. There is a tendency for visibility to deteriorate due to whiteness.

  The resin fine particles are preferably contained in the hard coat layer in the range of 1 to 15 parts by weight with respect to 100 parts by weight of the translucent resin. More preferably, it is contained in the range of 3 parts by weight or more and 10 parts by weight or less with respect to 100 parts by weight of the translucent resin. When the content of the resin fine particles is less than 1 part by weight, there is a tendency that sufficient anti-glare property is not exhibited or the surface unevenness is sparse and the texture is lowered. On the other hand, when the content of the resin fine particles exceeds 15 parts by weight, the surface haze increases, and as a result, the antiglare film tends to be white and visibility tends to decrease.

  As the translucent resin for dispersing the translucent fine particles, an ultraviolet curable resin, a thermosetting resin, an electron beam curable resin, and the like can be used. From the viewpoint of productivity and hardness, the ultraviolet curable resin is used. Preferably used. A commercially available product can be used as the ultraviolet curable resin. For example, one or more polyfunctional acrylates such as trimethylolpropane triacrylate and pentaerythritol tetraacrylate, and “Irgacure 907”, “Irgacure 184” (above, manufactured by Ciba Specialty Chemicals), “ A mixture with a photopolymerization initiator such as “Lucirin TPO” (manufactured by BASF) can be used as an ultraviolet curable resin. For example, in the case of using an ultraviolet curable resin, after the light-transmitting fine particles are dispersed in the ultraviolet curable resin, the resin composition is applied onto a resin base film and irradiated with ultraviolet rays, thereby transmitting the light. A hard coat layer in which translucent fine particles are dispersed in a resin (hard coat resin) can be formed.

  The thickness of the hard coat layer can be appropriately adjusted so that the surface haze is within the above range, but is preferably 2 μm or more and 20 μm or less. When the thickness of the hard coat layer is less than 2 μm, sufficient hardness cannot be obtained and the film tends to be scratched. When the thickness is greater than 20 μm, the hard coat layer is easily cracked, or the hard coat layer is hardened and contracted due to curing shrinkage. Tends to curl and reduce productivity. In general, the thickness of the hard coat layer is preferably 85% or more, more preferably 100% or more, based on the weight average particle diameter of the light-transmitting fine particles to be dispersed. When the thickness of the hard coat layer is less than 85% of the weight average particle diameter of the translucent fine particles, the surface haze increases, and as a result, the antiglare film tends to be white and the visibility tends to decrease.

  The antiglare film of the present invention which is a laminate of the resin base film and the hard coat layer as described above is normal to the hard coat layer side when light is incident at an incident angle of 20 ° from the resin base film side. Relative scattered light intensity T (20) observed in FIG. 2 shows a value of 0.0001% or more and 0.0006% or less, and when light is incident from the resin substrate film side at an incident angle of 30 °, the hard coat layer side method It is preferable that the relative scattered light intensity T (30) observed in the linear direction shows a value of 0.00004% or more and 0.0002% or less. Here, the relative scattered light intensity T (20) in the normal direction of the hard coat layer when the light is incident from the resin base film side at an incident angle of 20 ° and the light is incident at an incident angle of 30 ° and T (30) will be described.

  FIG. 2 shows light when light is incident from the resin base film side (opposite side of the uneven surface of the hard coat layer) and the scattered light intensity is measured in the normal direction of the hard coat layer side (uneven surface side). It is the perspective view which showed typically the incident direction of this, and the transmitted scattered light intensity | strength measurement direction. Referring to FIG. 2, light 203 incident at an angle φ (incident angle) from normal 202 on the resin base film side of antiglare film 201 is transmitted in the direction of normal 202 on the hard coat layer side. The intensity of the transmitted scattered light 204 is measured, and a value obtained by dividing the transmitted scattered light intensity by the light intensity of the light source is defined as a relative scattered light intensity T (φ). That is, when light 203 is incident at an angle of 20 ° from the normal line 202 on the resin base film side of the antiglare film 201, the intensity of the transmitted scattered light 204 observed in the direction of the hard coat layer side normal line 202 is determined as the light source. When the light 203 is incident at an angle of 30 ° from the normal line 202 on the resin base film side of the antiglare film 201, the value divided by the light intensity of the hard coat layer side normal line 202 is T (20). A value obtained by dividing the intensity of the transmitted scattered light 204 observed in the direction by the light intensity of the light source is T (30). The light 203 is incident such that the direction of the light 203 incident from the resin base film side and the normal line 202 of the antiglare film are on the same plane (plane 209 in FIG. 2).

  When the relative scattered light intensity T (20) at 20 ° incidence exceeds 0.0006%, when this antiglare film is applied to an image display device, the luminance during black display increases due to the scattered light. , Reduce the contrast. Further, when the relative scattered light intensity T (20) at 20 ° incidence is less than 0.0001%, the scattering effect is low, and glare occurs when applied to a high-definition image display device. Similarly, even when the relative scattered light intensity T (30) at 30 ° incidence exceeds 0.0002%, when this antiglare film is applied to an image display device, the luminance at the time of black display due to the scattered light. Increases and decreases contrast. Also, when the relative scattered light intensity T (30) at 30 ° incidence is less than 0.00004%, the scattering effect is low, and glare occurs when applied to a high-definition image display device. In particular, when the antiglare film is applied to a liquid crystal display that is not self-luminous, the effect of increasing the brightness due to scattering caused by light leakage during black display is large, and therefore the relative scattered light intensities T (20) and T (30) are high. If it exceeds the preferable range, the contrast is remarkably lowered and the visibility is impaired.

  3 shows the relative scattered light intensity (logarithmic scale) measured by changing the incident angle φ from the resin base film side of the antiglare film of the present invention (antiglare film 201 in FIG. 2) with respect to the incident angle φ. It is an example of the graph plotted. Such a graph representing the relationship between the incident angle and the relative scattered light intensity, or the relative scattered light intensity for each incident angle read therefrom may be referred to as a transmission scattering profile. As shown in this graph, the relative scattered light intensity has a peak at an incident angle of 0 °, and the scattered light intensity tends to decrease as the angle from the normal direction of the incident light 203 increases. Incidentally, the plus (+) and minus (−) of the incident angle depends on the direction of the incident light 203 around the normal direction (0 °) and the inclination of the incident light in the plane 209 including the normal line 202. It is determined. Therefore, the transmission / scattering profile usually appears symmetrically about the incident angle of 0 °. In the example of the transmission scattering profile shown in FIG. 3, the relative scattered light intensity T (0) at 0 ° incidence shows a peak at about 15%, and the relative scattered light intensity T (20) at 20 ° incidence is about The relative scattered light intensity T (30) at 0.0003% and 30 ° incidence is about 0.00006%.

  In measuring the relative scattered light intensity of the antiglare film, it is necessary to accurately measure the relative scattered light intensity of 0.001% or less. Therefore, it is effective to use a detector with a wide dynamic range. As such a detector, for example, a commercially available optical power meter can be used, and an aperture is provided in front of the detector of this optical power meter so that the angle at which the antiglare film is viewed is 2 °. Measurements can be made using an angular photometer. Visible light of 380 to 780 nm can be used as incident light, and a collimated light emitted from a light source such as a halogen lamp may be used as a measurement light source, or parallelism with a monochromatic light source such as a laser. Higher ones may be used. Moreover, in order to prevent the anti-glare film from warping, it is preferable to use an optically transparent pressure-sensitive adhesive so that it is bonded to a glass substrate so that the concavo-convex surface becomes the surface and then used for the measurement.

  In view of the above, the relative scattered light intensities T (20) and T (30) defined in the present invention are measured as follows. The antiglare film is bonded to a glass substrate so that the uneven surface becomes the surface, and parallel light from a He-Ne laser is irradiated from the direction inclined at a predetermined angle with respect to the film normal on the glass surface side. The transmitted scattered light intensity in the film normal direction is measured on the uneven surface side of the antiglare film. For the measurement of transmitted scattered light intensity, “3292 03 Optical Power Sensor” and “3292 Optical Power Meter” manufactured by Yokogawa Electric Corporation are used for both T (20) and T (30).

  FIG. 4 is a diagram showing the relationship between the relative scattered light intensities T (20) and T (30) and the contrast. As is apparent from FIG. 4, when the relative scattered light intensity T (20) exceeds 0.0006% or T (30) exceeds 0.0002%, the contrast tends to decrease by 10% or more, and the visibility tends to be impaired. You can see that The contrast was measured by the following procedure. First, the polarizing plate on the back side and the display surface side is peeled off from a commercially available liquid crystal television (“LC-42GX1W” manufactured by Sharp Corporation), and instead of the original polarizing plate, Sumitomo A polarizing plate “Sumikaran SRDB31E” manufactured by Chemical Co., Ltd. was bonded via an adhesive so that each absorption axis coincided with the absorption axis of the original polarizing plate. And the anti-glare film which has the structure similar to the anti-glare film which concerns on this invention which shows various scattered light intensity | strength was bonded through the adhesive so that an uneven surface might become the surface. Next, the liquid crystal television thus obtained was activated in a dark room, and using a luminance meter “BM5A” manufactured by Topcon Corporation, the luminance in the black display state and the white display state was measured, and the contrast was calculated. Here, the contrast is represented by the ratio of the luminance in the white display state to the luminance in the black display state.

  The antiglare film of the present invention has a reflectance R (30) at a reflection angle of 30 ° of 0.05% or more and 2% or less when light is incident from the hard coat layer side at an incident angle of 30 °. The reflectance R (40) at a reflection angle of 40 ° is 0.0001% or more and 0.005% or less, and the reflectance R (50) at a reflection angle of 50 ° is 0.00001% or more and 0.0005% or less. It is preferable. By making the reflectance R (30), the reflectance R (40) and the reflectance R (50) within the above ranges, the anti-glare is more effectively suppressed while showing excellent anti-glare performance. A film is provided.

  Here, the reflectance for each angle when light is incident at an incident angle of 30 ° from the hard coat layer side will be described. FIG. 5 is a perspective view schematically showing an incident direction and a reflection direction of light from the hard coat layer side with respect to the antiglare film when the reflectance is obtained. Referring to FIG. 5, the reflected light in the direction of the reflection angle of 30 °, that is, the regular reflection direction 506 with respect to the light 505 incident at an angle of 30 ° from the normal 502 on the hard coat layer side of the antiglare film 501. Let R (30) be the reflectance (that is, regular reflectance). Of the light 507 reflected at an arbitrary reflection angle θ, the reflectance of reflected light at θ = 40 ° and the reflectance of reflected light at θ = 50 ° are R (40) and R (50), respectively. . Note that the direction of reflected light when measuring the reflectance (the specular reflection direction 506 and the reflection direction of the light 507 reflected at the reflection angle θ) is within the plane 509 including the direction of the incident light 505 and the normal line 502. To do.

  When the regular reflectance R (30) exceeds 2%, a sufficient antiglare function cannot be obtained, and the visibility tends to decrease. On the other hand, even if the regular reflectance R (30) is too small, since it tends to cause whitening, it is preferably 0.05% or more. The regular reflectance R (30) is more preferably 1.5% or less, particularly 0.7% or less. On the other hand, if R (40) exceeds 0.005% or R (50) exceeds 0.0005%, the antiglare film is whitened and the visibility tends to be lowered. That is, for example, even when black is displayed on the display surface with an anti-glare film installed on the forefront of the display device, a whitish color occurs that picks up light from the surroundings and makes the display surface entirely white. There is a tendency. Therefore, it is preferable that R (40) and R (50) are not so large. On the other hand, R (40) is generally preferably 0.0001% or more, and R (50) is generally 0, since sufficient antiglare properties are not exhibited even if the reflectance at these angles is too small. It is preferably 0.0001% or more. R (50) is more preferably 0.0001% or less.

  FIG. 6 shows the reflection of the light 507 reflected at the reflection angle θ with respect to the light 505 incident at an angle of 30 ° from the normal 502 on the hard coat layer side of the antiglare film of the present invention (antiglare film 501 in FIG. 5). It is an example of the graph which plotted the relationship between angle (theta) and a reflectance (a reflectance is a logarithmic scale). Such a graph representing the relationship between the reflection angle and the reflectance, or the reflectance for each reflection angle read therefrom may be referred to as a reflection profile. As shown in this graph, the regular reflectance R (30) is a reflectance peak with respect to the light 505 incident at 30 °, and the reflectance tends to decrease as the angle deviates from the regular reflection direction. In the example of the reflection profile shown in FIG. 6, the regular reflectance R (30) is about 0.4%, R (40) is about 0.001%, and R (50) is about 0.00003%. .

  In measuring the reflectance of the antiglare film, it is necessary to accurately measure a reflectance of 0.001% or less as in the case of the relative scattered light intensity. Therefore, it is effective to use a detector with a wide dynamic range. As such a detector, for example, a commercially available optical power meter can be used, and an aperture is provided in front of the detector of this optical power meter so that the angle at which the antiglare film is viewed is 2 °. Measurements can be made using an angular photometer. As incident light, visible light of 380 to 780 nm can be used, and as a measurement light source, a collimated light emitted from a light source such as a halogen lamp may be used, or a monochromatic light source such as a laser is used in parallel. A high degree may be used. In the case of an antiglare film having a smooth and transparent back surface, reflection from the back surface of the antiglare film may affect the measured value. For example, the smooth surface of the antiglare film is adhered to a black acrylic resin plate with an adhesive or It is preferable that only the reflectance on the outermost surface of the antiglare film can be measured by optical adhesion using a liquid such as water or glycerin.

  In view of the above, the reflectances R (30), R (40) and R (50) defined in the present invention are measured as follows. Irradiation of the parallel light from the He-Ne laser onto the concavo-convex surface of the antiglare film from a direction inclined by 30 ° with respect to the film normal, and the angle of reflectance in a plane including the film normal and the light incident direction Measure changes. In the measurement of reflectance, both “3292 03 optical power sensor” and “3292 optical power meter” manufactured by Yokogawa Electric Corporation are used.

The antiglare film of the present invention may have a low reflection film on the outermost surface thereof, that is, on the uneven surface side of the hard coat layer. Even in the absence of a low reflection film, a sufficient antiglare function is exhibited, but the antiglare property can be further improved by providing a low reflection film on the outermost surface. The low reflection film can be formed by providing a layer of a low refractive index material having a lower refractive index on the hard coat layer. Specific examples of such a low refractive index material include lithium fluoride (LiF), magnesium fluoride (MgF ₂ ), aluminum fluoride (AlF ₃ ), cryolite (3NaF · AlF ₃ or Na ₃ AlF _6). ) And other inorganic low-reflective materials containing acrylic resin, epoxy resin, etc .; fluorine-based or silicone-based organic compounds, thermoplastic resins, thermosetting resins, UV-curable resins, etc. An organic low reflection material can be mentioned.

<Anti-glare polarizing plate>
The anti-glare film of the present invention has an excellent anti-glare effect, is effectively prevented from being whitish, and can effectively suppress the occurrence of glare and a decrease in contrast, so that it has excellent visibility when mounted on an image display device. It will be. When the image display device is a liquid crystal display, this antiglare film can be applied to the polarizing plate. In other words, in general, there are many polarizing plates in which a protective film is bonded to at least one surface of a polarizing film made of a polyvinyl alcohol-based resin film adsorbed and oriented with iodine or a dichroic dye. The antiglare film of the present invention is used. By attaching the polarizing film and the antiglare film of the present invention on the resin base film side of the antiglare film, an antiglare polarizing plate can be obtained. In this case, the other surface of the polarizing film may be in a state where nothing is laminated, another protective film or an optical film may be laminated, and an adhesive layer for bonding to a liquid crystal cell. May be formed. In addition, the antiglare film of the present invention is bonded on the side of the resin substrate film on the protective film of the polarizing plate having a protective film bonded to at least one surface of the polarizing film to obtain an antiglare polarizing plate. You can also. Furthermore, in the polarizing plate having a protective film bonded to at least one side, after bonding the resin base film to the polarizing film as the protective film, by forming the hard coat layer on the resin base film, It can also be set as an anti-glare polarizing plate.

<Image display device>
The image display device of the present invention is a combination of the antiglare film or the antiglare polarizing plate of the present invention and an image display element. Here, the image display element is typically a liquid crystal panel that includes a liquid crystal cell in which liquid crystal is sealed between upper and lower substrates and displays an image by changing the alignment state of the liquid crystal by applying a voltage. The antiglare film or the antiglare polarizing plate of the present invention can also be applied to various known displays such as a display panel, a CRT display, and an organic EL display. In the image display device of the present invention, the antiglare film is disposed on the viewing side with respect to the image display element. Under the present circumstances, it arrange | positions so that the uneven surface of an anti-glare film, ie, a hard-coat layer side, may become an outer side (viewing side). The antiglare film may be directly bonded to the surface of the image display element. When the liquid crystal panel is used as the image display element, for example, as described above, the antiglare film is bonded to the surface of the liquid crystal panel via the polarizing film. You can also. Thus, the image display device provided with the antiglare film of the present invention can scatter incident light due to the unevenness of the surface of the antiglare film and blur the reflected image, giving excellent visibility.

  In addition, the anti-glare film of the present invention does not cause glare as seen in conventional anti-glare films even when applied to a high-definition image display device. It has the performances of prevention of glare, suppression of glare, and suppression of decrease in contrast.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. In the examples, “%” and “part” representing the content or amount used are based on weight unless otherwise specified. Moreover, the evaluation method of the anti-glare film in the following examples is as follows.

(1) Measurement of optical properties of antiglare film (1-1) Haze Three-layer resin base film (resin base film (A), (B) having a light diffusion layer sandwiched between two transparent resin layers , (E)) or the internal haze of a resin base film (resin base film (D)) having a single-layer structure comprising a transparent resin layer is formed by applying an optically transparent adhesive on one surface of the resin base film. Is used to bond to a glass substrate, and then the other surface is bonded to a triacetyl cellulose film having a haze of approximately 0 using an optically transparent adhesive, and the glass substrate and the triacetyl cellulose film are used. The sandwiched resin base film was measured using a haze meter “HM-150” manufactured by Murakami Color Research Laboratory in accordance with JIS K 7136. The internal haze of the resin base film (resin base film (C)) having a two-layer structure consisting of a transparent resin layer and a light diffusion layer laminated on the transparent resin layer is the surface on the transparent resin layer side of the resin base film. An optically transparent pressure-sensitive adhesive is used to bond to a glass substrate, and then a triacetyl cellulose film having a haze of approximately 0 is bonded to the surface of the light diffusion layer using glycerin. The resin base film sandwiched between the acetylcellulose films was measured using a haze meter “HM-150” manufactured by Murakami Color Research Laboratory in accordance with JIS K 7136. As for the hard coat layer, first, after forming the hard coat layer on the triacetyl cellulose film having a haze of approximately 0%, the laminated film and the glass substrate are formed so that the triacetyl cellulose film side becomes the bonding surface. Were bonded using an optically transparent adhesive, and the entire haze was measured using a haze meter “HM-150” manufactured by Murakami Color Research Laboratory Co., Ltd. based on JIS K 7136. Next, a triacetyl cellulose film having a haze of almost 0 was bonded to the concavo-convex surface of the hard coat layer using glycerin, and the internal haze was measured again in accordance with JIS K 7136. The surface haze was calculated based on the above formula (1).

(1-2) Transmission scattering profile An anti-glare film is bonded to a glass substrate so that the concavo-convex surface becomes a surface, and from the direction inclined at a predetermined angle with respect to the film normal on the glass surface side, He-Ne. Parallel light from the laser was irradiated, and the transmitted scattered light intensity in the film normal direction was measured on the antiglare film uneven surface side. For the measurement of transmitted scattered light intensity, “3292 03 Optical Power Sensor” and “3292 Optical Power Meter” manufactured by Yokogawa Electric Corporation were used.

(1-3) Reflection profile In the plane including the film normal and the irradiation direction, the concavo-convex surface of the antiglare film is irradiated with parallel light from a He-Ne laser from a direction inclined by 30 ° with respect to the film normal. The angle change of reflectance was measured. In the measurement of reflectance, both “3292 03 optical power sensor” and “3292 optical power meter” manufactured by Yokogawa Electric Corporation were used.

(1-4) Transmission Visibility The transmission clarity of the anti-glare film was measured using an image clarity measuring device “ICM-1DP” manufactured by Suga Test Instruments Co., Ltd. based on JIS K 7105. Also in this case, in order to prevent the sample from warping, it was subjected to measurement after being bonded to a glass substrate using an optically transparent adhesive so that the concavo-convex surface became the surface. In this state, light was incident from the glass side and measurement was performed. The measured value here is a total value of values measured using four types of optical combs in which the widths of the dark part and the bright part are 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm, respectively. . In this case, the maximum value of the transmission clarity is 400%.

(1-5) Reflection Sharpness Using the same image clarity measuring device “ICM-1DP” as above, the reflection sharpness of the antiglare film was measured. Also in this case, in order to prevent the sample from warping, it was subjected to measurement after being bonded to a glass substrate using an optically transparent adhesive so that the concavo-convex surface became the surface. Further, in order to prevent reflection from the back glass surface, a 2 mm thick black acrylic resin plate is adhered to the glass surface of the glass plate on which the antiglare film is pasted, and attached in this state. The measurement was performed with light incident from the side. The measured value here is a total value of values measured using three types of optical combs in which the widths of the dark part and the bright part are 0.5 mm, 1.0 mm, and 2.0 mm, respectively (maximum value 300 %).

(2) Measurement of surface shape of antiglare film The surface shape of the antiglare film was measured using a confocal microscope “PLμ2300” manufactured by Sensofar. Also in this case, in order to prevent the sample from warping, it was subjected to measurement after being bonded to a glass substrate using an optically transparent adhesive so that the concavo-convex surface became the surface. At the time of measurement, the magnification of the objective lens was 50 times. Based on the measurement data, by calculation conforming to JIS B 0601, obtained arithmetic average height P _a in the cross section curve, the maximum section height P _t, and the average length PS _m.

(3) Evaluation of anti-glare performance of anti-glare film (3-1) Visual evaluation of reflection and whitish Black acrylic so that the uneven surface becomes the surface in order to prevent reflection from the back of the anti-glare film An antiglare film was bonded to the resin plate, and visually observed from the uneven surface side in a bright room with a fluorescent lamp, and the presence or absence of reflection of the fluorescent lamp and the degree of whitening were visually evaluated. Reflection and whitishness were evaluated according to the following criteria in three stages of 1 to 3, respectively.
(A) Reflection; 1: Reflection is not observed. 2: Reflection is slightly observed. 3: Reflection is clearly observed.
(B) Whiteness; 1: Whiteness is not observed. 2: A little whitish is observed. 3: The whitish is clearly observed.

(3-2) Evaluation of glare The glare was evaluated by the following method. That is, first, a photomask having a unit cell pattern as shown in a plan view in FIG. 7 was prepared. In this figure, in the unit cell 700, a key-shaped chrome light shielding pattern 701 having a line width of 10 μm is formed on a transparent substrate, and a portion where the chrome light shielding pattern 701 is not formed is an opening 702. Here, a unit cell having a size of 254 μm × 84 μm (vertical × horizontal in the figure), and thus a size of the opening 702 of 244 μm × 74 μm (vertical × horizontal in the figure) was used. A large number of unit cells shown in the figure are arranged vertically and horizontally to form a photomask.

Then, as shown in a schematic cross-sectional view in FIG. 8, the chrome light-shielding pattern 701 of the photomask 703 is placed on the light box 705, and the antiglare film 801 is coated with the adhesive on the glass plate 707 with the uneven surface on the surface. The sample bonded so as to become is placed on the photomask 703. A light source 706 is disposed in the light box 705. In this state, visual observation was performed at a position 709 that is about 30 cm away from the sample. The degree of glare was evaluated according to the following criteria in three stages of 1 to 3.
Glitter; 1: Glitter is not recognized. 2: Very slight glare is observed. 3: Severe glare is observed.

<Example 1>
(I) Production of Resin Base Film An acrylic resin containing 30 parts by weight of acrylic rubber particles in 70 parts by weight of a copolymer of methyl methacrylate / methyl acrylate = 96/4 (weight ratio) (refractive index 1.49). System resin composition and methyl methacrylate / styrene copolymer beads (refractive index 1.505, weight average particle diameter 8 μm) so that the beads are 15 parts by weight with respect to 100 parts by weight of the acrylic resin composition. After mixing with a Henschel mixer, the mixture was melt-kneaded with a first extruder (screw diameter 65 mm, uniaxial, vented (manufactured by Toshiba Machine Co., Ltd.)) and supplied to the feed block. In addition, an acrylic resin composition in which 30 parts by weight of acrylic rubber particles is contained in 70 parts by weight of a copolymer (refractive index 1.49) of methyl methacrylate / methyl acrylate = 96/4 (weight ratio) is the second. Were melt-kneaded with an extruder (screw diameter: 45 mm, uniaxial, with vent (manufactured by Hitachi Zosen)), and supplied to the feed block. The resin supplied to the feed block from the first extruder becomes a light diffusion layer (intermediate layer), and the resin supplied to the feed block from the second extruder becomes a transparent resin layer (surface layer: both sides) Co-extrusion molding was performed at 265 ° C., and a resin base film composed of three layers having a thickness of 120 μm (intermediate layer 72 μm, surface layer 24 μm × 2) was produced through a roll unit set at 85 ° C. Let this be a resin base film (A).

(Ii) Formation of hard coat layer having fine irregularities The following components were dissolved in ethyl acetate at a solid concentration of 60%, and an ultraviolet curable resin composition having a refractive index of 1.53 after curing was prepared. .

Pentaerythritol triacrylate 60 parts Polyfunctional urethanized acrylate (reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate) 40 parts

  Next, 4 parts by weight of a porous silica particle “Silisia 310P” (trade name, weight average particle diameter of 2.7 μm) with respect to 100 parts by weight of the solid content of the ultraviolet curable resin composition, with a photopolymerization initiator. Add 5 parts by weight of a certain “Lucirin TPO” (manufactured by BASF, chemical name: 2,4,6-trimethylbenzoyldiphenylphosphine oxide), and dilute with ethyl acetate to a solid content of 60%. A liquid was prepared.

This coating solution was coated on the resin base film (A) so that the coating thickness after drying was 4 μm, and dried for 1 minute in a drier set at 80 ° C. The UV-curable resin composition is irradiated with light from a high-pressure mercury lamp having an intensity of 20 mW / cm ² from the side of the UV-curable resin composition layer of the dried film so that the amount of light in terms of h-line is 300 mJ / cm ² . The layer was cured to obtain an antiglare film comprising a laminate of a hard coat layer (thickness 3.7 μm) having irregularities on the surface and a resin base film.

<Example 2>
An antiglare film was produced in the same manner as in Example 1 except that the thickness of the hard coat layer was 6.9 μm.

<Example 3>
First, a resin base material composed of three layers in the same manner as in Example 1 except that the thickness of the light diffusion layer as an intermediate layer is 50 μm and the transparent resin layers laminated on both sides of the light diffusion layer are each 15 μm. A film (B) was obtained (thickness 80 μm). Next, a hard coat layer was formed on the resin base film (B) in the same manner as in Example 1 except that the thickness of the hard coat layer was 6.5 μm to obtain an antiglare film.

<Example 4>
First, a resin base film (C) having a two-layer structure in which a light diffusion layer (thickness: 50 μm) is laminated on a transparent resin layer (thickness: 30 μm) by using the same resin composition as in Example 1 is used. Obtained (thickness 80 μm). Next, a hard coat layer is formed on the light diffusion layer of the resin base film (C) in the same manner as in Example 1 except that the thickness of the hard coat layer is 6.7 μm, and an antiglare film is obtained. It was.

<Example 5>
An antiglare film was produced in the same manner as in Example 1 except that the thickness of the hard coat layer was 2.5 μm.

<Example 6>
An antiglare film was produced in the same manner as in Example 3 except that the thickness of the hard coat layer was 2.6 μm.

<Example 7>
An antiglare film was produced in the same manner as in Example 4 except that the thickness of the hard coat layer was 2.8 μm.

<Comparative Examples 1-3>
First, an acrylic resin composition in which 30 parts by weight of acrylic rubber particles are contained in 70 parts by weight of a copolymer of methyl methacrylate / methyl acrylate = 96/4 (weight ratio) (refractive index 1.49), The film was formed into a film by extrusion to obtain a resin base film (D) having a single layer structure and a thickness of 80 μm. The resin base film (D) does not contain fine particles, and its internal haze is substantially zero. Next, a resin was prepared in the same manner as in Example 1 except that the thickness of the hard coat layer was 3.5 μm (Comparative Example 1), 6.9 μm (Comparative Example 2), and 2.4 μm (Comparative Example 3), respectively. A hard coat layer was formed on the base film (D) to produce an antiglare film.

<Comparative Examples 4-6>
Resin in the same manner as in Examples 2 to 4 except that the thickness of the hard coat layer was 2.1 μm (Comparative Example 4), 2.2 μm (Comparative Example 5), and 2.2 μm (Comparative Example 6), respectively. A hard coat layer was formed on the base film to produce an antiglare film.

<Comparative Examples 7-9>
First, as a resin composition constituting the light diffusion layer, 70 parts by weight of a copolymer of methyl methacrylate / methyl acrylate = 96/4 (weight ratio) (refractive index 1.49), 30 parts by weight of acrylic rubber particles, and Using an acrylic resin composition consisting of 15 parts by weight of methyl methacrylate / styrene copolymer beads (refractive index 1.510, weight average particle diameter 4 μm), a thickness of 80 μm (light diffusion) by the same procedure as in Example 1. A resin base film (E) consisting of three layers of a layer (intermediate layer) 50 μm and a transparent resin layer (surface layer: both sides) 15 μm × 2) was obtained. Next, a resin was prepared in the same manner as in Example 1 except that the thickness of the hard coat layer was 6.5 μm (Comparative Example 7), 2.6 μm (Comparative Example 8), and 2.2 μm (Comparative Example 9), respectively. A hard coat layer was formed on the substrate film (E) to produce an antiglare film.

  FIG. 9 shows the angle dependence of the scattered light intensity obtained by measuring the scattered light intensity for the antiglare films of Examples 1 to 4 (graph of the transmission scattering profile), and the angle dependence of the reflected light obtained by the reflectance measurement. FIG. 10 shows the property (graph of reflection profile). Similarly, FIGS. 11 and 12 are a graph of a transmission / scattering profile and a graph of a reflection profile for the antiglare films of Examples 5 to 7, respectively. 13 and 14 are a graph of a transmission / scattering profile and a graph of a reflection profile for the antiglare films of Comparative Examples 1 to 3, respectively. 15 and 16 are a graph of a transmission / scattering profile and a graph of a reflection profile for the antiglare films of Comparative Examples 4 to 6, respectively. 17 and 18 are a graph of a transmission / scattering profile and a graph of a reflection profile for the antiglare films of Comparative Examples 7 to 9, respectively.

  Moreover, about the anti-glare film of the said Examples 1-7 and Comparative Examples 1-8, (I) The structure of a resin base film, the property of the microparticles | fine-particles added to the light-diffusion layer, etc. (II) Hard coat layer Properties, (III) optical properties, and (IV) antiglare performance are summarized in Tables 1 to 4, respectively. In addition, the breakdown of the transmission sharpness and reflection sharpness of the anti-glare film of Example 1 shown in Table 3 is as follows.

Transmission sharpness Reflection sharpness 0.125 mm optical comb: 7.6% −
0.5mm optical comb: 16.0% 2.7%
1.0mm optical comb: 31.2% 3.5%
2.0 mm optical comb: 56.1% 16.4%
Total 110.9% 22.6%

  As shown in Tables 2 to 4, when the antiglare film of the present invention (Examples 1 to 7) exhibits excellent antiglare performance, it does not cause glare or whitish and is applied to an image display device. In addition, the relative scattered light intensities T (20) and T (30), which cause a decrease in contrast, also show good scattering characteristics that are sufficiently low. On the other hand, since the antiglare films of Comparative Examples 1 to 3 have the same surface shape as Examples 1, 2, and 5, respectively, while exhibiting excellent antiglare performance, whitish did not occur, Due to the fact that the resin base film does not have internal haze, the suppression of glare is insufficient. In the antiglare films of Comparative Examples 4 to 6, since the thickness of the hard coat layer was considerably smaller than the weight average particle diameter of the added fine particles, the surface haze of the hard coat layer showed a high value, and whitening occurred. Since the antiglare films of Comparative Examples 7 and 8 have the same surface shape as that of Examples 2 and 5, respectively, while exhibiting excellent antiglare performance, no glare or whitish occurred, but the resin base film The internal haze is extremely high, the relative scattered light intensities T (20) and T (30) are high, and the contrast is lowered when applied to an image display device. Since the antiglare film of Comparative Example 9 had the same surface shape as Comparative Examples 4 to 6, the surface haze of the hard coat layer showed a high value and whitening occurred. Further, since the internal haze of the resin base film is extremely high, the values of the relative scattered light intensities T (20) and T (30) are high, and the contrast is lowered when applied to an image display device.

<Examples 8 to 10 and Comparative Examples 10 to 11>
As translucent fine particles, methyl methacrylate / styrene copolymer beads having a weight average particle diameter of 6 μm and a refractive index of 1.53 were used instead of porous silica particles, based on 100 parts by weight of the solid content of the ultraviolet curable resin composition. An antiglare film was produced in the same manner as in Example 1 except that a hard coat layer was formed on the resin base film shown in Table 5 with the thickness shown in Table 5 using 5 parts by weight.

  FIG. 19 shows the angle dependence of the scattered light intensity obtained by measuring the scattered light intensity for the antiglare films of Examples 8 to 10 (transmission scattering profile graph). FIG. 19 shows the angle dependence of the reflected light obtained by reflectance measurement. FIG. 20 shows the property (graph of reflection profile). Further, FIG. 21 shows the angle dependency of scattered light intensity obtained by the measurement of scattered light intensity for the antiglare films of Comparative Examples 10 and 11 (transmission scattering profile graph), and FIG. 21 shows the reflected light obtained by the reflectance measurement. The angle dependency (reflection profile graph) is shown in FIG.

  Moreover, about the anti-glare film of the said Examples 8-10 and the comparative examples 10 and 11, (V) The property of a hard-coat layer etc., (VI) Optical property, and (VII) Anti-glare performance are respectively Table 5- 7

  As shown in Tables 5 to 7, when the antiglare film of the present invention (Examples 8 to 10) is applied to an image display device without exhibiting glare or whitish while exhibiting excellent antiglare performance. In addition, the relative scattered light intensities T (20) and T (30), which cause a decrease in contrast, also showed good scattering characteristics that were sufficiently low. On the other hand, the antiglare film of Comparative Example 10 has the same surface shape as that of Examples 8 to 10. Therefore, although the whitish did not occur while showing excellent antiglare performance, the resin base film was Due to the absence of internal haze, glare suppression is insufficient. Moreover, since the surface shape of the antiglare film of Comparative Example 11 is equivalent to that of Examples 8 to 10, the glare and the whitish did not occur while exhibiting excellent antiglare performance. Since the internal haze is extremely high, the values of the relative scattered light intensities T (20) and T (30) increase, and the contrast decreases when applied to an image display device.

  Based on the above results, a hard coat layer is formed by designing and applying a resin solution in which translucent fine particles are dispersed on the resin base film used in the examples so that the reflection characteristics are appropriate. For example, glare and whitening do not occur, and the relative scattered light intensities T (20) and T (30), which cause a decrease in contrast when applied to an image display device, also exhibit good scattering characteristics that are sufficiently low. I found out that

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  By disposing the antiglare film of the present invention on various displays such as a liquid crystal panel, a plasma display panel, a CRT display, and an organic EL display so that the antiglare film is closer to the viewing side than the image display element. It is possible to blur the reflected image without generating blurring and glare, and to provide excellent visibility.

It is a cross-sectional schematic diagram which shows the preferable example of the anti-glare film of this invention. Schematic representation of incident light direction and transmitted scattered light intensity measurement direction when measuring the scattered light intensity observed in the normal direction of the hard coat layer side when light is incident from the resin base film side of the antiglare film It is a perspective view shown in FIG. It is an example of the graph which plotted the relative scattered light intensity | strength (logarithmic scale) measured by changing the incident angle (phi) using the anti-glare film of this invention with respect to the incident angle. It is a figure which shows the relationship between relative scattered light intensity | strength T (20) and T (30), and contrast. It is a perspective view which shows typically the incident direction and reflection direction of the light from the hard-coat layer side when calculating | requiring a reflectance. It is an example of the graph which plotted the relationship between the reflection angle of the reflected light with respect to the light which injected at the angle of 30 degrees from the normal line of the anti-glare film of this invention, and a reflectance (a reflectance is a logarithmic scale). It is a top view which shows the unit cell of the pattern for glare evaluation. It is a cross-sectional schematic diagram which shows the state at the time of glare evaluation. It is a graph showing the transmission-scattering profile of the anti-glare film obtained in Examples 1-4. It is a graph showing the reflection profile of the anti-glare film obtained in Examples 1-4. It is a graph showing the transmission-scattering profile of the anti-glare film obtained in Examples 5-7. It is a graph showing the reflection profile of the anti-glare film obtained in Examples 5-7. It is a graph showing the transmission-scattering profile of the anti-glare film obtained in Comparative Examples 1-3. It is a graph showing the reflection profile of the anti-glare film obtained in Comparative Examples 1-3. It is a graph showing the transmission-scattering profile of the anti-glare film obtained by Comparative Examples 4-6. It is a graph showing the reflection profile of the anti-glare film obtained by Comparative Examples 4-6. It is a graph showing the transmission-scattering profile of the anti-glare film obtained by Comparative Examples 7-9. It is a graph showing the reflection profile of the anti-glare film obtained by Comparative Examples 7-9. It is a graph showing the transmission-scattering profile of the anti-glare film obtained in Examples 8-10. It is a graph showing the reflection profile of the anti-glare film obtained in Examples 8-10. It is a graph showing the transmission-scattering profile of the anti-glare film obtained in Comparative Examples 10 and 11. It is a graph showing the reflection profile of the anti-glare film obtained in Comparative Examples 10 and 11.

Explanation of symbols

  101a, 101b Resin base film, 102a, 102b Hard coat layer, 103a, 103b Transparent resin layer, 104a, 104b Light diffusion layer, 105a, 105b Fine particles, 106a, 106b Translucent fine particles, 201, 501, 801 Antiglare film 202, 502 Normal of anti-glare film, 203 Light incident at angle φ from normal, 204 Transmitted scattered light transmitted in normal direction, 209, 509 Incident light direction and normal of anti-glare film 505, light incident at an angle of 30 °, 506 specular reflection direction, 507 light reflected at the reflection angle θ, 700 photomask unit cell, 701 chrome light shielding pattern of photomask, 702 opening of photomask 703 Photomask 705 Light box 706 Light source 707 Glass plate 709 glare of the observation position.

Claims (10)

An antiglare film comprising a resin base film and a hard coat layer laminated on the surface of the resin base film and having a fine uneven shape on the surface;
The resin base film has a multilayer structure including at least one transparent resin layer made of a transparent resin, and at least one light diffusion layer containing a transparent binder resin and fine particles having a refractive index different from that of the transparent binder resin. Have
Here, the internal haze of the resin base film is 5% or more and 30% or less,
The hard coat layer is made of a translucent resin in which at least one translucent fine particle is dispersed,
The antiglare film wherein the hard coat layer has a surface haze of 0.5% to 15% and an internal haze of 2% or less. The internal haze of the resin base film is 10% or more and 25% or less,
The antiglare film according to claim 1, wherein the hard coat layer has a surface haze of 0.5% or more and 5% or less.   The anti-glare film according to claim 1, wherein the hard coat layer is made of a translucent resin in which silica-based fine particles are dispersed.   The silica-based fine particles have a weight average particle diameter of 1 μm or more and 5 μm or less, and are contained within a range of 1 part by weight or more and 5 parts by weight or less with respect to 100 parts by weight of the translucent resin. The antiglare film as described.   The anti-glare film according to claim 1, wherein the hard coat layer is made of a translucent resin in which resin fine particles are dispersed.   The antiglare film according to claim 5, wherein a difference in refractive index between the translucent resin and the resin fine particles is 0.01 or less.   The resin fine particles have a weight average particle diameter of 2 μm or more and 10 μm or less, and are contained within a range of 1 part by weight or more and 15 parts by weight or less with respect to 100 parts by weight of the translucent resin. The anti-glare film as described in 2.   The antiglare film according to any one of claims 1 to 7, further comprising a low reflection film on the uneven surface of the hard coat layer. An antiglare polarizing plate obtained by bonding the antiglare film according to any one of claims 1 to 8 and a polarizing film,
The polarizing film is an antiglare polarizing plate arranged on the resin base film side of the antiglare film. An antiglare film according to any one of claims 1 to 8 or an antiglare polarizing plate according to claim 9, and an image display element,
The antiglare film or the antiglare polarizing plate is an image display device arranged on the viewing side of the image display element with the hard coat layer side facing outside.

Images