Antidazzle reflection preventing film and picture display device

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to an antireflection film having antiglare properties and a liquid crystal display device using the same.

【0002】

[Conventional technology]

Antireflection films are generally reflected by the principle of optical interference in image display devices such as liquid crystal displays (LCDs), CRTs, and PDPs in order to prevent contrast deterioration and image reflection due to reflection of external light. Placed on the outermost surface of the display to reduce the rate [0003]

However, in an antireflection film having only a hard coat layer and a low refractive index layer on a transparent support, the low refractive index layer must be sufficiently low in refractive index in order to reduce the reflectance, and triacetyl. An antireflection film that uses cellulose as a support and a UV-cured film of dipentaerythritol hexaacrylate as a hard coat layer. The refractive index is 1.40 or less in order to reduce the average reflectance of light with a wavelength of 450 nm to 650 nm to 1.6% or less. Must be. Examples of materials having a refractive index of 1.40 or less include magnesium fluoride and calcium fluoride for inorganic substances, and fluorine-containing compounds having a high fluorine content for organic substances. Since these fluorine compounds do not have cohesive power, a film to be placed on the outermost surface of the display. The scratch resistance was insufficient. Therefore, a compound having a refractive index of 1.43 or more was required to have sufficient scratch resistance.

【0004】

Japanese Patent Application Laid-Open No. 7-287102 describes that the reflectance is reduced by increasing the refractive index of the hard coat layer. However, in such a high refractive index hard coat layer, since the difference in refractive index from the support is large, color unevenness of the film occurs, and the wavelength dependence of the reflectance also greatly oscillates. Further, Japanese Patent Application Laid-Open No. 7-333404 describes an antiglare antireflection film having excellent gas barrier property, antiglare property, and antireflection property. It is inferior in productivity as compared with wet coating in which an object is applied to form a film. Furthermore, the antireflection property of the antiglare antireflection film thus obtained was not satisfactory.

【0005】

In recent years, the definition of the liquid crystal display device has been improved, and as the pixel pitch of the liquid crystal cell approaches the period of the surface unevenness of the antiglare layer, the brightness unevenness in the display state becomes stronger, and as a result, a glaring feeling occurs. It came to occur. To solve this problem, for example, if the surface unevenness period is reduced by increasing the amount of matte particles in the antiglare layer composed of binders and matte particles, the glare will be improved, but at the same time, the surface scattering of external light will be strong. As a result, the front brightness in bright room and black display increases, and the front contrast decreases.

【0006】

[Problems to be Solved by the Invention]

An object of the present invention is to simultaneously satisfy various performances such as anti-glare performance when mounted on an image display device, particularly a high-definition liquid crystal display device, and antireflection, antifouling property, scratch resistance, and transmission image sharpness. Moreover, it is an object of the present invention to provide an antiglare antireflection film which can be obtained at low cost by all-wet coating. Another object of the present invention is to provide a liquid crystal display device having excellent contrast, visibility, image sharpness, and the like.

【0007】

[Means for solving problems]

The object of the present invention has been achieved as follows. 1. In an antiglare antireflection film having at least one low refractive index layer on a transparent support and an antiglare layer between the transparent support and the low refractive index layer, the surface energy of the antiglare layer is 25mN m^-1~ 70mN m^-1An anti-glare anti-reflective film characterized by being. 2. The surface energy of the antiglare layer is 35mN m^-1~ 70mN ^-1The antiglare and antireflection film according to 1 above. 3. The antiglare antireflection film according to 1 or 2 above, wherein the haze value due to internal scattering of the antiglare layer is 1 to 60%. 4. The antiglare antireflection film according to any one of 1 to 3 above, wherein the haze value due to surface scattering of the antiglare layer is 1 to 20%. 5. The antiglare layer is composed of a transparent binder composition and matte particles having a light scattering effect, and the difference in refractive index between the transparent binder composition and the matte particles is 0.02 to 0.2. The anti-glare anti-reflection film according to any one of 1 to 4. 6. The antiglare antireflection film according to any one of 1 to 5 above, wherein the antiglare layer contains a fluorine-based surfactant and / or a silicone-based surfactant. 7. The antiglare layer has a F / C of 0.40 or less, which is the ratio of the peak derived from fluorine atom to the peak derived from carbon atom measured by X-ray photoelectron spectroscopy, and / or the peak derived from silicon atom and the peak derived from carbon atom. The antiglare and antireflection film according to 6 above, wherein the Si / C ratio is 0.30 or less. 8. 8. Any of the above 1 to 7 characterized in that the solvent having a boiling point of 100 ° C. or less at 1 atm occupies 50 to 100% by mass of the coating solvent used in the coating composition for forming the low refractive index layer. Anti-glare anti-reflection film described in Crab. 9. The low refractive index layer is mainly composed of (i) a cured product of a thermosetting or ionizing radiation curable fluororesin, or (ii) the cured product and ultrafine oxide particles of silicon, and has a low refractive index. The antiglare antireflection film according to 8 above, wherein the refractive index of the rate layer is 1.45 or less. 10. The transparent binder composition of the antiglare layer is an oxide ultrafine particle of at least one metal selected from zirconium, titanium, aluminum, indium, zinc, tin, and antimony and a trifunctional or higher (meth) acrylate monomer. The antimony reflection according to any one of 1 to 9 above, which is mainly composed of a heat or ionized radiation cured product of a mixture with and, and has a refractive index of a transparent binder composition in the range of 1.57 to 2.00. Prevention film. 11. 11. 10. The antiglare according to 10 above, wherein the transparent binder composition is an ultraviolet curable product of a composition containing ultrafine particles of zirconium oxide and a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate. Anti-reflection film. 12. The antiglare antireflection film according to any one of 1 to 11 above, wherein the matte particles having a light scattering effect contained in the antiglare layer are resin particles. 13. The antiglare antireflection film according to 12 above, wherein the resin particles as mat particles contained in the antiglare layer are crosslinked polystyrene. 14. A transparent support is created by casting a triacetyl cellulose dope prepared by dissolving triacetyl cellulose in a solvent by either a single-layer casting method or a multi-layer co-casting method. The antiglare and antireflection film according to any one of 1 to 13 above, which is a triacetyl cellulose film obtained from the above. 15. 15. The above 14 is characterized in that the triacetyl cellulose dope is a triacetyl cellulose dope prepared by dissolving triacetyl cellulose in a solvent substantially free of dichloromethane by a low temperature dissolution method or a high temperature dissolution method. Anti-glare anti-reflection film. 16. A polarizing plate characterized in that the antiglare antireflection film according to 14 or 15 above is used for at least one of the two protective films of the polarizing layer in the polarizing plate. 17. In the above 16 polarizing plates, the protective film of the two protective films that is not the antiglare antireflection film has an optically anisotropic layer on the transparent support that also serves as the protective film. The optically anisotropic layer is a layer having a negative double polarization made of a compound having a discotic structural unit, the disk surface of the discotic structural unit is inclined with respect to the transparent support surface, and the discotic structure is formed. A polarizing plate characterized in that the angle formed by the disk surface of the unit and the transparent support surface changes in the depth direction of the optically anisotropic layer. 18. 18. A liquid crystal display device characterized in that the antiglare antireflection film according to any one of 1 to 15 above or the antireflection layer of the polarizing plate according to 16 or 17 above is used as the outermost layer of a display.

【0008】

BEST MODE FOR CARRYING OUT THE INVENTION

The basic configuration of the antiglare antireflection film of the present invention will be described with reference to the drawings.

【0009】

FIG. 1 schematically shows an aspect of the antiglare antireflection film of the present invention as a schematic cross-sectional view. In this embodiment, the antiglare antireflection film 1 has a layer structure in the order of a transparent support 2 made of triacetyl cellulose, a hard coat layer 3, an antiglare layer 4, and a low refractive index layer 5. Matte particles 6 are dispersed in the antiglare layer 4. The refractive index of the transparent binder composition of the antiglare layer 4 is 1.57 to 2.00, and the refractive index of the low refractive index layer 5 is 1.38 to 1.49.

【0010】

As the transparent support used in the antiglare antireflection film of the present invention, a triacetyl cellulose film composed of a single layer or a plurality of layers is used. The single-layer triacetyl cellulose is prepared by drum casting, band casting, etc. disclosed in JP-A-7-1055, etc., and the latter triacetyl cellulose consisting of a plurality of layers is described in JP-A61. It is prepared by the so-called co-current diffusion method disclosed in Gazette No. 94725, Gazette No. 62-43846, etc. That is, the raw material flakes are used as a solvent such as halogenated hydrocarbons (dimethane, etc., alcohols (methanol, ethanol, butanol, etc.), esters (methyl formate, methyl acetate, etc.), ethers (dioxane, dioxolane, diethyl ether, etc.), etc. A horizontal endless solution (called a dope) is prepared by dissolving in, and adding various additives such as a plasticizer, an ultraviolet absorber, an anti-deterioration agent, a slip agent, and a peeling accelerator as necessary. When cast on a support consisting of a metal belt or a rotating drum by a dope feeding means (called a die), a single dope is cast in a single layer if it is a single layer, and a high concentration if it is in multiple layers. A low-concentration dope is co-spread on both sides of the cellulose ester dope, and the film that has been dried to some extent on the support to have rigidity is peeled off from the support, and then passed through the drying part by various transport means to make a solvent. It is a method consisting of removing.

【0011】

Dichloromethane is a typical solvent for dissolving triacetyl cellulose as described above. However, technically, halogenated hydrocarbons such as dichloromethane can be used without problems, but from the viewpoint of the global environment and working environment, it is preferable that the solvent does not substantially contain halogenated hydrocarbons such as dichloromethane. Here, "substantially free" means that the proportion of halogenated hydrocarbons in the organic solvent is less than 5% by mass, preferably less than 2% by mass. When adjusting the dope of triacetyl cellulose using a solvent that does not substantially contain dichloromethane or the like, a special dissolution method as described later is indispensable.

【0012】

The first melting method is called a cooling melting method and will be described below. First, triacetyl cellulose is gradually added to the solvent at a temperature near room temperature (-10 to 40 ° C) with stirring. The mixture is then cooled to -100 to -10 ° C (preferably -80 to -10 ° C, more preferably -50 to -20 ° C, most preferably -50 to -30 ° C). Cooling can be carried out, for example, in a dry ice / methanol bath (-75 ° C) or a cooled diethylene glycol solution (-30 to -20 ° C). When cooled in this way, the mixture of triacetyl cellulose and the solvent solidifies. Further, when this is heated to 0 to 200 ° C, preferably 0 to 150 ° C, more preferably 0 to 120 ° C, most preferably 0 to 50 ° C, a solution in which triacetyl cellulose flows in a solvent. It becomes. The temperature rise may be simply left at room temperature or may be heated in a warm bath.

【0013】

The second method is called the high temperature melting method and will be described below. First, triacetyl cellulose is gradually added to the solvent at a temperature near room temperature (-10 to 40 ° C) with stirring. The triacetyl cellulose solution of the present invention is preferably swelled in advance by adding triacetyl cellulose to a mixed solvent containing various solvents. In this method, the dissolution concentration of triacetyl cellulose is preferably 30% by mass or less, but it is preferably as high as possible from the viewpoint of drying efficiency during film formation. Next, the organic solvent mixture is heated to 70 to 240 ° C, preferably 80 to 220 ° C, more preferably 100 to 200 ° C, and most preferably 100 to 190 ° C under a pressure of 0.2 to 30 MPa. .. Next, since these heated solutions cannot be applied as they are, it is necessary to cool them below the lowest boiling point of the solvent used. In that case, it is common to cool to -10 to 50 ° C and return to normal pressure. For cooling, a high-pressure high-temperature container or line containing a triacetyl cellulose solution may be left at room temperature, and more preferably, the apparatus may be cooled with a refrigerant such as cooling water.

【0014】

In the antiglare antireflection film of the present invention, a hard coat layer may be applied between the transparent support and the antiglare layer for the purpose of improving the scratch resistance of the film, if necessary. The compound used for the hard coat layer is preferably a polymer having a saturated hydrocarbon or a polyether as a main chain, and more preferably a polymer having a saturated hydrocarbon as a main chain. The binder polymer is preferably crosslinked. The polymer having a saturated hydrocarbon as a main chain is preferably obtained by a polymerization reaction of an ethylenically unsaturated monomer. In order to obtain a crosslinked binder polymer, it is preferable to use a monomer having two or more ethylenically unsaturated groups.

【0015】

Examples of monomers having two or more ethylenically unsaturated groups include esters of polyhydric alcohols with (meth) acrylic acids (eg, ethylene glycol di (meth) acrylates, 1,4-dichlorohexanediacrylates, penta). Erislitol tetra (meth) acrylate), pentaerythritol tri (meth) acrylate, trimethylolpropantri (meth) acrylate, trimethylol ethanetri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) Acrylate, dipentaerythritol hexa (meth) acrylate, 1,3,5-cyclohexanetriol trimethacrylate, polyurethane polyacrylate, polyester polyacrylate), derivatives of vinylbenzene (eg, 1,4-divinylbenzene, 4-vinyl benzoic acid) -2-Acryloyl ethyl ester, 1,4-divinylcyclohexanone), vinylsulfone (eg, divinylsulfone), acrylamide (eg, methylenebisacrylamide) and methacrylicamide. Among these, a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate is particularly preferably used and is commercially available.

【0016】

These monomers having an ethylenically unsaturated group need to be dissolved in a solvent together with various polymerization initiators and other additives, coated, dried, and then cured by a polymerization reaction by ionizing radiation or heat.

【0017】

The crosslinked structure may be introduced into the binder polymer in place of or in addition to the monomer having two or more ethylenically unsaturated groups by the reaction of the crosslinkable group. Examples of crosslinkable functional groups include isocyanato groups, epoxy groups, aziridine groups, oxazoline groups, aldehyde groups, carbonyl groups, hydrazine groups, carboxyl groups, methylol groups and active methylene groups. Metal alkoxides such as vinyl sulfonic acids, acid anhydrides, cyanoacrylate derivatives, melamines, etherified methylols, esters and urethanes, tetramethoxysilanes are also available as monomers or materials for introducing crosslinked structures. A functional group that exhibits crosslinkability as a result of the decomposition reaction may be used, such as a block isocyanate group. That is, the cross-linking group is not limited to the above compound, and may be one that exhibits reactivity as a result of decomposition of the above-mentioned functional group. After coating, these compounds having a cross-linking group need to be cross-linked by heat or the like.

【0018】

The refractive index of the material of the transparent binder composition forming the antiglare layer of the present invention is preferably 1.57 to 2.00, more preferably 1.60 to 1.80. The refractive index of the material forming the low refractive index layer is preferably 1.38 to 1.49. The refractive index of triacetyl cellulose, which is preferably used as a transparent support, is 1.48. If the refractive index of the transparent binder composition forming the antiglare layer is too small, the antireflection property is lowered. Further, if this is too large, the color of the reflected light of the antireflection film becomes strong, which is not preferable. Further, the antireflection property becomes better as the refractive index of the low refractive index layer is between 1.38 and 1.49, but the tint of the reflected light becomes stronger.

【0019】

The haze value of the antiglare layer of the antiglare antireflection film of the present invention is 0 to 60%, preferably 1 to 60%, due to internal scattering, and 1 to 20 due to surface scattering. It is preferably%. Here, the haze caused by internal scattering is a haze value measured when the transparent binder composition forming the antiglare layer is overcoated to smooth the surface. Internal scattering contributes to (a) the refractive index of the transparent binder composition forming the antiglare layer and (b) matte particles having a particle size equal to or larger than the layer thickness for forming the surface unevenness and / or the surface unevenness. It can be imparted by setting the difference in the refractive index from the refractive index of the fine particles having a particle size less than the layer thickness of 0.02 to 0.2. By imparting such internal scattering property, when applied to an image forming apparatus, surface irregularities act as a lens, and so-called glare generated by enlarging pixels can be significantly alleviated. Further, particularly when applied to a liquid crystal display device, it is particularly preferable to use it in combination with a phase difference compensation film as described later, because a display device having a wide viewing angle can be obtained in all directions of up, down, left and right. A haze value of 1% or more due to internal scattering is particularly preferable in terms of improving glare, and if it exceeds 60%, the transmittance decreases.

【0020】

Surface scattering is inevitably generated by forming surface irregularities with a specific period in order to impart antiglare, and if it is less than 1%, antiglare cannot be imparted, and if it exceeds 20%, it is backward. Scattering becomes too large and whitening of the film becomes unacceptable in a bright room. For example, when mounted on a liquid crystal display device, the background reflection is severe at less than 1%, and the contrast decreases at more than 20%. ..

【0021】

The compound forming the antiglare layer includes a monomer having a high refractive index or ultrafine metal oxide having a high refractive index in addition to the material forming the hard coat layer. Examples of high refractive index monomers include bis (4-methacryloylthiophenyl) sulfide, vinylnaphthalene, vinylphenyl sulfide, 4-methacryloxyphenyl-4'-methoxyphenylthioether and the like. As the metal oxide ultrafine particles having a high refractive index, fine particles having a particle size of 100 nm or less, preferably 50 nm or less, composed of at least one oxide selected from zirconium, titanium, aluminum, indium, zinc, tin and antimony. Can be mentioned. As a specific example of fine particles, ZrO₂, TiO₂, Al₂O₃, In₂O₃, ZnO, SnO₂, Sb₂O₃, ITO, etc., among these, especially ZrO₂Is preferably used. The amount of the metal oxide ultrafine particles added is preferably 10 to 90% by mass, more preferably 20 to 80% by mass, based on the total mass of the transparent binder composition. The difference in refractive index from the matte particles can be freely controlled.

【0022】

As described above, the antiglare layer contains matte particles for the purpose of imparting antiglare property, preventing deterioration of reflectance due to interference of the hard coat layer, and preventing color unevenness. The matte particles are preferably transparent. The average particle size of the mat particles is preferably 1.0 to 5.0 μm, more preferably 1.7 to 3.5 μm, based on the number average particle size obtained by the Coulter method. If the average particle size is less than 1.0 μm, the antiglare property is insufficient, and if it exceeds 5.0 μm, the clearness of the transmitted image deteriorates. Inorganic compound particles or resin particles are used as the matte particles, for example, amorphous silica particles and TiO.₂Particles, Al₂O₃Crosslinked acrylic particles such as particles and crosslinked polymethylmethacrylate particles, crosslinked styrene particles, melamine resin particles, benzoguanamine resin particles, and crosslinked siloxane particles are preferably used. Resin particles are used in terms of good dispersion stability (because of good affinity with the binder) and good sedimentation stability (because of small specific gravity) in the antiglare hard coat layer coating liquid during manufacturing. More preferably, crosslinked styrene particles are particularly preferable. Further, as the shape of the matte particles, either a spherical shape or an indeterminate shape can be used, but a spherical shape is preferable in order to obtain stable antiglare properties. Two or more different kinds of particles may be used in combination.

【0023】

Further, the antiglare layer or other layers may simultaneously contain fine particles having a particle size smaller than that of the fine particles in order to impart internal scattering, although they do not contribute to antiglare properties. The particle size of the fine particles for the purpose of imparting internal scattering is the number average particle size obtained by the Coulter method, and is preferably 0.1 μm or more and less than 1.0 μm.

【0024】

In the antiglare layer of the present invention, in order to ensure surface uniformity such as coating unevenness, drying unevenness, point defects, etc., either a fluorine-based or silicone-based surfactant, or both of them are formed as an antiglare layer. It may be contained in the coating composition for use. In particular, a fluorine-based surfactant is preferably used because the effect of improving surface defects such as uneven coating, uneven drying, and point defects of the antiglare antireflection film of the present invention appears at a smaller addition amount. Preferred examples of fluorine-based surfactants are nonions containing perfluoroalkyl sulfonic acid amide groups such as Florard FC-431 manufactured by 3M Ltd., and Megafuck F-171, F-172, F- of Dainippon Ink Co., Ltd. Examples thereof include perfluoroalkyl group-containing oligomers such as 173 and F-176PF. Examples of the silicone-based surfactant include polydimethylsiloxane in which the ends of the side chain and main chain are modified with various substituents such as oligomers such as ethylene glycol and propylene glycol.

【0025】

However, by using the above-mentioned surfactant, the surface energy of the antiglare layer is reduced due to segregation of functional groups containing F atoms and / or functional groups having Si atoms on the surface of the antiglare layer. When the low refractive index layer is overcoated on the antiglare layer, there arises a problem that the antireflection performance is deteriorated. It is presumed that this is because the wettability of the coating composition used for forming the low refractive index layer deteriorates, so that minute unevenness that cannot be visually detected in the film thickness of the low refractive index layer deteriorates. In order to solve such problems, the surface energy of the antiglare layer can be increased by 25 mN m by adjusting the structure and amount of fluorine-based and / or silicone-based surfactants added, or by not adding them at all.^-1~ 70mN m^-1, Preferably 35mN m^-1~ 70mN m^-1, More preferably 40 mN m^-1~ 70mN m^-1It is effective to control the temperature to 50 to 100% by mass of the coating solvent used in the coating composition for forming a low refractive index layer, as described later, at 100 ° C or less at 1 atm. It was found that it is effective to occupy a solvent having a boiling point. In addition, in order to realize the above surface energy, the F / C, which is the ratio of the peak derived from fluorine atom to the peak derived from carbon atom measured by X-ray photoelectron spectroscopy, must be 0.40 or less and the silicon atom. It is preferable that Si / C, which is the ratio of the peak derived from the carbon atom to the peak derived from the carbon atom, satisfies at least one of 0.30 or less.

【0026】

The low refractive index layer of the antiglare antireflection film of the present invention preferably satisfies the following mathematical formula (I). mλ / 4 × 0.7 <n₁d₁<mλ / 4 × 1.3 Formula (I) In the equation, m is a positive odd number (generally 1) and n₁Is the index of refraction of the low index layer, and d₁Is the film thickness (nm) of the low refractive index layer. Further, λ is a set wavelength and is in the range of 500 to 550 (nm). Satisfying the above equation (I) means m (positive odd number, usually) satisfying the equation (I) in the above wavelength range. 1) means that there is.

【0027】

For the low refractive index layer, a cured product of a thermosetting type or ionizing radiation curable type fluororesin is used. The coefficient of kinetic friction of the cured product is preferably 0.03 to 0.15, and the contact angle with water is preferably 90 to 120 degrees. Examples of the curable fluororesin include a perfluoroalkyl group-containing silane compound (for example, (heptadecafluoro-1,1,2,2-tetradecyl) triethoxysilane) and the like, as well as a fluoropolymer and a crosslinkable group. Fluorine-containing copolymers having a monomer for the above as a constituent unit can be mentioned. Specific examples of the fluorine-containing monomer unit include, for example, fluoroolefins (for example, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoroethylene, hexafluoropropylene, perfluoro-2,2-dimethyl-1,3-dioxol and the like. ), Partial or partially fluorinated alkyl ester derivatives of (meth) acrylic acid (for example, Viscoat 6FM (manufactured by Osaka Organic Chemicals), M-2020 (manufactured by Daikin), etc.), fully or partially fluorinated vinyl ethers, etc. As the monomer for imparting a crosslinkable group, in addition to a (meth) acrylate monomer having a crosslinkable functional group in the molecule in advance such as glycidyl methacrylate, it has a carboxyl group, a hydroxyl group, an amino group, a sulfonic acid group and the like (meth). ) Acrylic monomers (eg, (meth) acrylic acid, methylol (meth) acrylate, hydroxyalkyl (meth) acrylate, allyl acrylate, etc.) can be mentioned. It is described in JP-A-10-25388 and JP-A-10-147739 that the latter can introduce a crosslinked structure after copolymerization.

【0028】

Further, not only the polymer having the above-mentioned fluorine-containing monomer as a constituent unit, but also a copolymer with a monomer not containing a fluorine atom may be used. The monomer unit that can be used in combination is not particularly limited, and for example, olefins (ethylene, propylene, isoprene, vinyl chloride, vinylidene chloride, etc.), acrylate esters (methyl acrylate, methyl acrylate, ethyl acrylate, acrylate 2). -Ethylhexyl), methacrylate esters (methyl methacrylate, ethyl methacrylate, butyl methacrylate, ethylene glycol dimethacrylate, etc.), styrene derivatives (styrene, divinylbenzene, vinyltoluene, α-methylstyrene, etc.), vinyl ethers (methyl) Vinyl ethers, etc.), vinyl esters (vinyl acetate, vinyl propionate, vinyl cinnate, etc.), acrylamides (N-tertbutylacrylamide, N-cyclohexylacrylamide, etc.), methacrylicamides, acrylonitrile derivatives, etc. it can.

【0029】

It is preferable to add silicon oxide ultrafine particles to the fluororesin used for forming the low refractive index layer in order to impart scratch resistance. From the viewpoint of antireflection, the lower the refractive index is, the more preferable it is, but as the refractive index of the fluororesin is lowered, the scratch resistance deteriorates. Therefore, by optimizing the refractive index of the fluororesin and the amount of silicon oxide ultrafine particles added, the best balance between scratch resistance and low refractive index can be found. As the oxide ultrafine particles of silicon, a silica sol dispersed in a commercially available organic solvent may be added to the coating composition as it is, or various commercially available silica powders may be dispersed in the organic solvent and used.

【0030】

The coating composition for forming a low refractive index layer of the antiglare antireflection film of the present invention is a solvent having a boiling point of 100 ° C. or less at 1 atm, which is 50 to 100% by mass of the coating solvent used in the composition. It is preferable to occupy. Usually, after the coating composition for forming a low refractive index layer is applied on the antiglare layer, in the process of drying the solvent, the coating liquid flows along the unevenness of the surface of the antiglare layer, and a minute area that cannot be visually detected. The film thickness unevenness occurs in. Due to the uneven film thickness of the low refractive index layer, the reflectance becomes higher than the value predicted by the simulation. As the drying rate of the coating solvent becomes slower, this unevenness becomes larger, and therefore the reflectance becomes higher. When the drying is slowed down to a certain extent, minute punctate coating unevenness that can be visually detected becomes. Therefore, in the coating composition for the low refractive index layer of the present invention, the above solvent composition is preferable. If the proportion of the solvent having a boiling point of 100 ° C or less at 1 atm is less than 50% by mass, the increase in reflectance becomes an unacceptable level, which is not preferable. On the other hand, by using a solvent having a boiling point of more than 100 ° C at 1 atm so that the solvent occupies 0.1 or more and less than 50%, uneven drying and whitening of the film can be prevented. From the viewpoint of preventing an increase in reflectance, it is more preferable to use the solvent so as to occupy 0.1 to 5% by mass.

【0031】

Examples of the coating solvent having a boiling point of 100 ° C or less used in the coating composition for a low refractive index layer include a ketone solvent such as methyl ethyl ketone and acetone, an ester solvent such as ethyl acetate and methyl acetate, and an ether alcohol solvent such as methyl cellosolve. Among the solvents, alcohol solvents such as ethanol and methanol, those having high solubility of the solid content contained in the coating composition are preferably used, and methyl ethyl ketone is particularly preferably used. Ketone solvents such as cyclohexanone, cyclopentanone, and methyl-isobutylketone, diacetone alcohol, and propylene glycol are examples of coating solvents whose boiling point exceeds 100 ° C, which is used in an amount of less than 50% by mass of the total coating solvent. An ether alcohol solvent such as methyl ether, an alcohol solvent such as 1-butanol and 2-butanol, and the like are used, and cyclohexanone is particularly preferably used. If there is no problem with the coated surface, it may not be added.

【0032】

Each layer of the antireflection film is a dip coating method, an air knife coating method, a curtain coating method, a roller coating method, a wire bar coating method, a gravure coating method, a micro gravure coating method or an extrusion coating method (US Pat. No. 2,681294). Can be formed by coating. Two or more layers may be applied at the same time. The method of simultaneous application is described in US Pat. Nos. 2761791, 2941898, 3508947, 3526528 and Yuji Harasaki, Coating Engineering, p. 253, Asakura Shoten (1973).

【0033】

The antiglare antireflection film of the present invention can be applied to an image display device such as a liquid crystal display (LCD), a plasma display panel (PDP), an electroluminescence display (ELD) or a cathode ray tube display device (CRT). it can. The antiglare antireflection film of the present invention is applied as the outermost layer by adhering the transparent support side to the image display surface of the image display device. The polarizing plate consists of a polarizing layer (polarizer) and two protective films arranged on both sides thereof, and is used in a liquid crystal display device. In such a polarizing plate, the antiglare antireflection film can be used as the protective film itself on one side. As the other protective film, a normal cellulose acetate film may be used. The polarizing film includes an iodine-based polarizing film, a dye-based polarizing film using a dichroic dye, and a polyene-based polarizing film. The iodine-based polarizing film and the dye-based polarizing film are generally produced by using a polyvinyl alcohol-based film. In order to use it as a protective film for a polarizing layer, it is necessary to saponify the protective film from the viewpoint of adhesiveness. Since the antiglare antireflection film of the present invention has saponification resistance, it can be saponified immediately before being attached to the protective film. The saponification treatment may be carried out directly on the triacetyl cellulose film, after the hard coat layer is formed, or after the antiglare layer is formed, but from the viewpoint of productivity, the polarization treatment is carried out after all the layers are formed. It is preferable to carry out at the stage of manufacturing the plate.

【0034】

In the present invention, the antiglare reflective film of the present invention is used as a protective film on one side of a polarizing layer (polarizer), and the protective film on the opposite side is an optical composition of a liquid crystal compound on a transparent support that also serves as a transparent protective film. A polarizing plate having a structure having an heterogeneous layer is preferable. The optically anisotropic layer may be formed as a layer containing a disk-shaped compound (discotic compound) or a rod-shaped liquid crystal compound on a transparent support (polymer film). In the present invention, the liquid crystal compound is preferably a discotic compound. The optically anisotropic layer is preferably formed by orienting a disk-shaped compound (or rod-shaped liquid crystal compound) and fixing the oriented state. Disc-shaped compounds generally have a large birefringence. In addition, the disk-shaped compound has various orientation forms. Therefore, by using a disk-shaped compound, it is possible to obtain an optically anisotropic layer having optical properties that cannot be obtained with a conventional stretched birefringent film. In the present invention, the optically anisotropic layer is a layer having negative birefringence made of a compound having a discotic structural unit, and the disk surface of the discotic structural unit is tilted with respect to the transparent support surface and is discotic. It is more preferable that the angle formed by the disk surface and the transparent support surface of the structural unit changes in the depth direction of the optically anisotropic layer. For the optically anisotropic layer using the compound having a discotic structural unit on these transparent supports, refer to JP-A-6-214116, US Pat. No. 5,583,679, US Pat. No. 5,646,703, and West German Patent No. 3,911,620A1. There is a description. When used for liquid crystal display devices, it can be used for all liquid crystal cells such as transmissive type such as TN, STN, OCB, IPS, MVA, PDLC, semi-transmissive type such as TN, STN, HAN (reflecting OCB), PDLC, reflective type, etc. It can be preferably used.

【0035】

In order to explain the present invention in detail, examples will be given below, but the present invention is not limited thereto.

【0036】

[Example]

(Preparation of Triacetyl Cellulose Dope A) Raw materials consisting of 17.4 parts by mass of triacetyl cellulose, 2.6 parts by mass of triphenyl phosphate, 66 parts by mass of dichloromethane, 5.8 parts by mass of methanol, and 8.2 parts by mass of normal butanol are mixed and dissolved with stirring. Then, triacetyl cellulose dope A was prepared.

【0037】

(Preparation of Triacetyl Cellulose Dope B) A raw material consisting of 24 parts by mass of triacetyl cellulose, 4 parts by mass of triphenyl phosphate, 66 parts by mass of dichloromethane, and 6 parts by mass of methanol is mixed and dissolved with stirring to dissolve the triacetyl cellulose dope. Adjusted B.

【0038】

(Adjustment of triacetyl cellulose dope C) 20 parts by mass of triacetyl cellulose, 48 parts by mass of methyl acetate, 20 parts by mass of cyclohexanone, 5 parts by mass of methanol, 5 parts by mass of ethanol, triphenyl phosphate / biphenyl diphenyl phosphate (mass ratio: 1/2) 2 parts by mass, silica (particle size 20 nm) 0.1 parts by mass, 2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-tert-butylanilino) -1, Add 0.2 parts by mass of 3,5-triazine and stir to obtain a non-uniform gel solution, cool at -70 ° C for 6 hours, heat to 50 ° C and stir to add dope C. It was adjusted.

【0039】

(Adjustment of Triacetyl Cellulose Dope D) After heating the non-uniform gel solution obtained in the same manner as the above Triacetyl Cellulose Dope C in a stainless steel airtight container under a pressure of 1 MPa at 180 ° C for 5 minutes. , The whole container was put into a water bath at 50 ° C. and cooled to adjust triacetylcellulose dope D.

【0040】

(Preparation of coating liquid A for antiglare layer) 91 g of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA, manufactured by Nippon Kayaku Co., Ltd.), hard with zirconium oxide ultrafine particle dispersion having a particle size of about 30 nm 218 g of a coating solution (Desolite Z-7041, manufactured by JSR Co., Ltd.) was dissolved in 52 g of a mixed solvent of methyl ethyl ketone / cyclohexanone = 54/46% by weight. To the obtained solution, 10 g of a photopolymerization initiator (Irgacure 907, manufactured by Ciba Fine Chemicals Co., Ltd.) was added, and after stirring and dissolving, a fluorine-based surfactant (mega) consisting of a methyl ethyl ketone solution containing 20% by weight of a fluorine-containing oligomer. Fuck F-176PF , Dainippon Ink Co., Ltd.) 0.93 g was added. The refractive index of the coating film obtained by applying this solution and curing it with ultraviolet rays was 1.61. In addition, 80 g of 20 g of crosslinked polystyrene particles (trade name: SX-200HS, manufactured by Soken Kagaku Co., Ltd.) with a number average particle size of 1.99 μm and a standard deviation of 0.32 μm (16% of the number average particle size) are added to this solution. Methyl ethyl ketone / cyclohexanone = 54/46 wt% mixed solvent with stirring and dispersion at 5000 rpm for 1 hour at 5000 rpm, then polypropylene filters with pore sizes of 10 μm, 3 μm and 1 μm (PPE-10, PPE-03, PPE-01, respectively). 29 g of the dispersion obtained by filtering with Fuji Photo Film Co., Ltd. was added and stirred, and then filtered with a polypropylene filter having a pore size of 30 μm to prepare a coating liquid for an antiglare layer.

【0041】

(Preparation of coating liquid B for antiglare layer) With coating liquid A for antiglare layer except that the fluorine-based surfactant was replaced with a silicone-based surfactant (silicone X-22-945, manufactured by Shin-Etsu Chemical Co., Ltd.) In the same manner, a coating liquid B for an antiglare layer was prepared.

【0042】

(Preparation of coating liquid C for antiglare layer) A coating liquid C for antiglare layer was prepared in the same manner as coating liquid A for antiglare layer except that all fluorine-based surfactants were replaced with methyl ethyl ketone.

【0043】

(Preparation of coating liquid D for antiglare layer) For antiglare layer except that the amount of fluorine-based surfactant added was 3.72 g and the mixed solvent of methyl ethyl ketone / cyclohexanone (54% by mass / 46% by mass) was replaced with 49 g. A coating liquid D for an antiglare layer was prepared in the same manner as the coating liquid A.

【0044】

(Preparation of coating liquid E for antiglare layer) Hard containing 75 g of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA, manufactured by Nippon Kayaku Co., Ltd.) and a zirconium oxide ultrafine particle dispersion having a particle size of about 30 nm. 240 g of the coat coating solution (Desolite Z-7401, manufactured by JSR Co., Ltd.) was dissolved in 52 g of a mixed solvent of methyl ethyl ketone / cyclohexanone (54% by mass / 46% by mass). To the obtained solution, 10 g of a photopolymerization initiator (Irgacure 907, manufactured by Ciba Fine Chemicals Co., Ltd.) was added, and after stirring and dissolving, a fluorine-based surfactant (MegaFvck) consisting of a methyl ethyl ketone solution of 20% by mass of a fluorine-containing oligomer was added. F-176PF, manufactured by Dainippon Ink Co., Ltd., 0.93 g was added. The refractive index of the coating film obtained by applying this solution and curing it with ultraviolet rays was 1.65. Further, in this solution, 20 g of crosslinked polystyrene particles (trade name: SX-200HS, manufactured by Soken Kagaku Co., Ltd.) having an average number particle size of 2.0 μm and a refractive index of 1.61 is added to 80 g of methyl ethyl ketone / cyclohexanone (54% by mass / 46% by mass). Polypropylene filters with pore diameters of 10 μm, 3 μm, and 1 μm (PPE-10, PPE-03, PPE-01, all manufactured by Fuji Photo Film Co., Ltd.) After adding 29 g of the dispersion solution obtained by filtering in the above and stirring the mixture, the mixture was filtered through a polypropylene filter having a pore size of 30 μm to prepare a coating solution E for an antiglare layer.

【0045】

(Preparation of coating liquid F for antiglare layer) A coating liquid F for antiglare layer was prepared in the same manner as the coating liquid E for antiglare layer except that all fluorine-based surfactants were replaced with methyl ethyl ketone.

【0046】

(Preparation of coating liquid G for antiglare layer) Number of crosslinked polystyrene particles with average particle size of 1.3 μm and refractive index of 1.61 (trade name: SX-130H, manufactured by Soken Kagaku Co., Ltd.) 20 g of 80 g of methyl ethyl ketone / cyclohexanone (54 mass) % / 46% by mass), except that 15 g of the dispersion obtained by stirring and dispersing at 5000 rpm for 1 hour in a high-speed dispa was replaced with a mixed solvent of methyl ethyl ketone / cyclohexanone (54% by mass / 46% by mass). The coating liquid G for the antiglare layer was prepared in the same manner as the coating liquid F for the glare layer.

【0047】

(Preparation of coating liquid for hard coat layer) Add a solution of 250 g of UV curable hard coat composition (Desolite Z-7526, 72% by mass, manufactured by JSR Corporation) in a mixture of 62 g of methyl ethyl ketone and 88 g of cyclohexanone. It was. The refractive index of the coating film obtained by applying this solution and curing it with ultraviolet rays was 1.50. Further, this solution was filtered through a polypropylene filter (PPE-30) having a pore size of 30 μm to prepare a coating liquid for a hard coat layer.

【0048】

(Preparation of coating liquid A for low refractive index layer) MEK-ST (average grain) in 93 g of methyl ethyl ketone solution (JN-7228, manufactured by JSR Co., Ltd.) having a refractive index of 1.42 and 6% by mass of a heat-crosslinkable fluoropolymer. SiO with a diameter of 10 to 20 nm and a solid content concentration of 30% by mass₂Add 8 g of methyl ethyl ketone dispersion of sol, manufactured by Nissan Chemical Co., Ltd., and 100 g of methyl ethyl ketone (boiling point at 1 atm = 79.6 ° C), stir, and then filter with a polypropylene filter (PPE-01) with a pore size of 1 μm. , A coating solution for a low refractive index layer was prepared.

【0049】

(Preparation of coating liquid B for low refractive index layer) MEK-ST (average) in 93 g of methyl ethyl ketone solution ((JN-7228, manufactured by JSR Co., Ltd.)) having a refractive index of 1.42 and 6% by mass of a heat-crosslinkable fluoropolymer. SiO with a particle size of 10 to 20 nm and a solid content concentration of 30% by mass.₂Add 8 g of methyl ethyl ketone dispersion of sol, manufactured by Nissan Chemical Co., Ltd., 94 g of methyl ethyl ketone, and 6 g of cyclohexanone, stir, filter with a polypropylene filter (PPE-01) with a pore size of 1 μm, and apply for a low refractive index layer. Liquid B was prepared.

【0050】

(Preparation of coating liquid C for low refractive index layer) A solution in which 6% by mass of a heat-crosslinkable fluoropolymer having a refractive index of 1.41 is dissolved in a solvent containing 70% of methyl isobutyl ketone (JN-7219, JSR Co., Ltd.) (Made) 93g of MEK-ST (average particle size 10 ~ 20nm, solid content concentration 30% by mass SiO₂Add 8 g of methyl ethyl ketone dispersion of sol, manufactured by Nissan Chemical Co., Ltd., and 100 g of methyl isobutyl ketone (boiling point at 1 atm = 115.9 ° C), stir, and then filter with a polypropylene filter (PPE-01) with a pore size of 1 μm. Then, a coating liquid C for a low refractive index layer was prepared.

【0051】

[Example 1] According to Japanese Patent Application Laid-Open No. 11-254594, a three-layer co-flowing die is used, and dope A is co-spread on both sides of the dope B and simultaneously discharged onto a metal drum to form a multi-layer flow. After stretching, the casting film was peeled off from the drum and dried to prepare a three-layer co-flowing triacetyl cellulose film of 10 μm, 60 μm, and 10 μm from the drum surface side. No clear interface was formed between the layers of this film. Apply the above coating solution for the hard coat layer to the above triacetyl cellulose film using a bar coater, dry at 120 ° C, and then use an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) at 160 W / cm. Using, illuminance 400mW / cm², Irradiation amount 300mJ / cm²The coating layer was cured by irradiating with the ultraviolet rays of the above, and a hard coat layer having a thickness of 2.5 μm was formed. On it, the antiglare layer coating liquid A was applied using a bar coater, dried under the same conditions as the hard coat layer, and cured with ultraviolet rays to form an antiglare layer having a thickness of about 1.5 μm. The surface energy of the antiglare layer formed in this way is calculated by measuring the contact angles of pure water and diiodomethane and substituting it into the Owens surface energy formula, and calculating the ratio of fluorine atoms to carbon atoms on the surface of the antiglare layer. The F / C shown in the above was calculated as the value obtained by dividing the peak area derived from the fluorine atom measured by X-ray photoelectron spectroscopy by the peak area derived from the carbon atom.^-1, 0.28. On top of that, the coating liquid A for a low refractive index layer is applied using a bar coater, dried at 80 ° C., and then heat-crosslinked at 120 ° C. for 8 minutes to obtain a low refractive index layer having a thickness of 0.096 μm. Was formed.

【0052】

[Example 2] A hard coat layer was formed on a single-layer drum cast triacetyl cellulose film (TD80U, manufactured by FUJIFILM Corporation) having a thickness of 80 μm in the same manner as in Example 1. On top of this, the antiglare layer coating liquid B was applied in the same manner as in Example 1 and cured by ultraviolet rays to form an antiglare layer having a thickness of about 1.5 μm. When surface energy and Si / C were measured, they were 29 mN m, respectively.^-1, 0.12. On top of this, the coating liquid B for a low refractive index layer was applied and thermally crosslinked in the same manner as in Example 1 to form a low refractive index layer having a thickness of 0.096 μm.

【0053】

[Example 3] Example 1 except that the above triacetyl cellulose dope C was cast on a single-layer drum to prepare a triacetyl cellulose film having a thickness of 80 μm and used as a transparent support in accordance with JP-A-7-1055. An antiglare antireflection film was prepared in the same manner as in the above. When the surface energy and F / C were measured, it was 31 mN · m as in Example 1.^-1, 0.28.

【0054】

[Example 4] Example 1 except that the above triacetyl cellulose dope D was cast on a single-layer drum to prepare a triacetyl cellulose film having a thickness of 80 μm and used as a transparent support in accordance with JP-A-7-1055. An antiglare antireflection film was prepared in the same manner as in the above. When the surface energy and F / C were measured, it was 31 mN · m as in Example 1.^-1, 0.28.

【0055】

[Example 5] An antiglare antireflection film was prepared in the same manner as in Example 1 except that the antiglare coating liquid A was replaced with the antiglare coating liquid C. When the surface energy and F / C of the antiglare layer were measured, they were 43 mN and m, respectively.^-1, 0.007.

【0056】

[Example 6] An antiglare antireflection film was prepared in the same manner as in Example 1 except that the antiglare coating liquid A was replaced with the antiglare coating liquid E. When the surface energy and F / C of the antiglare layer were measured, they were 31 mN m, respectively.^-1, 0.28.

【0057】

[Example 7] An antiglare antireflection film was produced in the same manner as in Example 1 except that the antiglare layer coating liquid A was replaced with the antiglare layer coating liquid F. When the surface energy and F / C of the antiglare layer were measured, they were 43 mN and m, respectively.^-1, 0.007.

【0058】

[Example 8] An antiglare antireflection film was produced in the same manner as in Example 1 except that the antiglare layer coating liquid A was replaced with the antiglare layer coating liquid G. When the surface energy and F / C of the antiglare layer were measured, they were 43 mN and m, respectively.^-1, 0.007.

【0059】

[Comparative Example 1] A hard coat layer, an antiglare layer, and a low refractive index layer were formed in the same manner as in Example 1 except that the coating liquid D for the antiglare layer was used to prepare an antiglare antireflection film. The surface energy and F / C of the antiglare layer are 22mN m.^-1, 0.53.

【0060】

[Comparative Example 2] A hard coat layer, an antiglare layer, and a low refractive index layer are formed in the same manner as in Example 1 except that the coating liquid D for the antiglare layer and the coating liquid C for the low refractive index layer are used to prevent the antiglare layer. A dazzling antireflection film was created. The surface energy and F / C of the antiglare layer are 22mN m.^-1, 0.53.

【0061】

(Evaluation of anti-glare anti-reflection film) The following items were evaluated for the obtained film. The results are shown in Table 1. (1) Specular reflectance The adapter ARV-474 is attached to the spectrophotometer V-550 (manufactured by JASCO Corporation) to measure the specular reflectance of an emission angle of -5 degrees at an incident angle of 5 ° in the wavelength range of 380 to 780 nm. The average reflectance of 450 to 650 nm was calculated to evaluate the antireflection property. (2) Integral reflectance The adapter ILV-471 is attached to the spectrophotometer V-550 (manufactured by JASCO Corporation), and the incident angle is 5 ° with the standard white plate attached at the emission angle of -5 degrees in the wavelength range of 380 to 780 nm. The integrated value of the reflectance at all the emission angles (referred to as the integrated reflectance) was measured, and the average reflectance of 450 to 650 nm was calculated. (3) Haze value Haze meter MODEL for the haze of the obtained film It was measured using 1001DP (manufactured by Nippon Denshoku Kogyo Co., Ltd.). The internal haze is a haze value measured for a film having a surface roughness Ra of less than 0.01 by overcoating only the binder component contained in the antiglare layer on the film formed up to the antiglare layer. The external haze was calculated by subtracting the internal haze value from the haze value of the film formed up to the low refractive index layer. (4) Anti-glare evaluation Exposed fluorescent lamp (8000 cd / m) without louvers on the created anti-glare film²) Was projected, and the degree of blurring of the reflected image was evaluated according to the following criteria. I don't know the outline of the fluorescent light at all: The outline of the fluorescent lamp can be seen slightly: The fluorescent light is out of focus, but the outline is identifiable: Fluorescent light is almost unblurred: × (5) Glitter It was mounted on the LCD surface of Mobius PC-PJ2-X4 (manufactured by Sharp Corporation), which has an LCD panel with a resolution of 110 ppi, and the degree of glare in the solid green display was visually evaluated according to the following criteria. I don't understand the glare at all: Very slight glare: Slight glare: You can see the glare: × (6) Scratch resistance With # 0000 steel wool, it was rubbed 10 times with a weight of 200 g, and the scratching was evaluated according to the following criteria. No scratches: Slightly scratched but inconspicuous: Scratched, but low index layer remains: Full width is scratched: × [0062]

[table 1]

<img file="JP2002202402A_D0001.tif" />【0063】

From the results of the examples and comparative examples shown in Table 1, the following is clear. In particular, in Examples 6 to 8, no glare was observed even when mounted on a 110 ppi LCD, the balance between reflectance and antiglare was good, and the display quality was very high. Further, the antiglare antireflection film of Example 8 was used as a protective film on the outer surface of the polarizing plate on the visible side of the transmissive TN liquid crystal cell, and disco was used on the liquid crystal cell side and the liquid crystal cell side on the backlight side of the polarizing plate. Optics in which the disk surface of the tick structural unit is tilted with respect to the transparent support surface, and the angle between the disk surface of the discotic structural unit and the transparent support surface changes in the depth direction of the optical heterogeneous layer. When a liquid crystal cell was created using a wide-view film (WV-12A, manufactured by Fuji Photo Film Co., Ltd.), which has a compensating layer, no glare was seen, and the contrast in the bright room was excellent. A liquid crystal display device having a very wide viewing angle in the vertical and horizontal directions and extremely excellent visibility was obtained. In Comparative Example 1, since the surface energy of the antiglare layer was low, the reflectance performance after coating the low refractive index layer was remarkably deteriorated, and the product was not satisfactory. In Comparative Example 2, since the surface energy of the antiglare layer was low, the reflectance performance was further deteriorated, the glare when mounted on the 110 ppi LCD was deteriorated, and the scratch resistance due to the rubbing of steel wool was deteriorated. Further, since the drying rate of the solvent in the low refractive index layer is slow, the film thickness unevenness of the low refractive index layer is so small as to be visible, and the display quality is remarkably inferior.

【0064】

[Effect of the invention]

The anti-glare anti-reflection film of the present invention has various features such as anti-glare performance when mounted on an image display device, particularly a high-definition liquid crystal display device, anti-reflection property, antifouling property, scratch resistance, and clearness of transmitted image. The performance is satisfied at the same time, and it can be obtained at low cost by the all-wet coating method. Further, the image display device of the present invention, particularly the liquid crystal display device, is excellent in contrast, visibility, image sharpness, and the like.

[Simple explanation of drawings]

[Figure 1]

It is sectional drawing which shows one aspect of the antiglare antireflection film of this invention.

[Explanation of symbols]

1 Anti-glare anti-reflection film of the present invention 2 Transparent support made of triacetyl cellulose 3 hard coat layer 4 Anti-glare layer 5 Low index layer 6 resin particles