JP2001091707A - Antidazzle film, antidazzle and antireflection film and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide an antidazzle film adequate for a high- fineness image display device by stably producing the same with a simple method. SOLUTION: The antidazzle film which is an optical film having an antidazzle layer on a transparent base and in which the haze of the antidazzle layer is 4.0 to 50.0% and is the total of internal scattering of >=1.0% and surface scattering of >=3.0%, the antidazzle and antireflection film and the image display device using the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an antiglare film,
The present invention relates to an antiglare antireflection film and an image display device using the same.

[0002]

2. Description of the Related Art In general, anti-glare films and anti-reflection films are used in image display devices such as CRTs, PDPs, and LCDs in order to prevent reflection of images and reduction in contrast due to reflection of external light. It is arranged on the outermost surface of the display by reducing the reflectance using the principle of scattering and optical interference.

In recent years, with respect to LCDs, PDPs, and CRTs, the definition of pixels has been increasing with the increase in resolution for use in personal computer monitors. In particular, in LCDs, the change is rapid due to the progress of p-Si technology development.
When a conventional anti-glare film for preventing reflection due to external light is used in this high-definition image display device, glare such as a bright spot occurs randomly on the screen. This glare is caused by the formation of a lens like a lens due to the curvature of the surface irregularities, and the enlargement of the pixel when the focal point of the lens coincides with the position of the pixel. Since the surface irregularities of the anti-glare film are random, this focus cannot be controlled, and as a result, glare randomly occurs.

Japanese Patent Application Laid-Open No. 10-264284 describes an antiglare film for displaying a high-definition image, comprising an ultraviolet curable resin and crosslinked acrylic beads. This is done by using relatively small particles of 0.5 to 6.0 μm and improving the dispersibility of the particles. This is presumed to be such that, by making each unevenness smaller and increasing the curvature, the focal position is designed to be on the average on the whole as a whole. Although this method is used for displaying high-definition images to some extent, it is still insufficient.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an antiglare film suitable for a high-definition image display device at a low cost by stably producing the film using a simple method.

[0006]

The object of the present invention has been attained as follows. (1) In an optical film having an antiglare layer on a transparent support, the haze of the antiglare layer is 4.0 to 50.0%, and the haze is 1.0 to 40.0%. And a total of 3.0 to 30% of surface scattering. (2) The anti-glare layer has a refractive index different from the refractive index of the binder forming the anti-glare layer by 0.03 or more, and contains scattering particles having an average particle size of 1/3 or less of the film thickness. The anti-glare film according to (1), which comprises: (3) The anti-glare layer is characterized in that particles having a particle size larger than half of the film thickness include anti-glare particles occupying 40 to 100% of the whole particles. The anti-glare anti-reflection film according to (1). (4) The anti-glare layer has a refractive index different from that of the binder forming the anti-glare layer by 0.03 or more, and is １ of the film thickness.
Particles having a particle size larger than 40 to 10
The antiglare antireflection film according to (1), comprising scattering antiglare particles occupying 0%. (5) An antiglare hard coat film, wherein the material forming the antiglare layer according to (1) is an antiglare hard coat layer comprising a monomer having two or more ethylenically unsaturated groups. . (6) A low-refractive-index layer having a refractive index of 1.38 to 1.49 directly or via another layer on the antiglare layer according to any one of (1) to (5). Anti-glare anti-reflection film. (7) The low refractive index layer has a dynamic friction coefficient of 0.03 to 0.1.
5. The antiglare antireflection film according to (6), comprising a fluorine-containing compound which is crosslinked by heat or ionizing radiation having a contact angle of 90 to 120 ° with water. (8) An antiglare antireflection film, wherein the binder forming the antiglare layer according to (6) or (7) has a refractive index of 1.57 to 2.00. (9) The binder for forming the antiglare layer according to (8),
Monomer having two or more ethylenically unsaturated groups and titanium, aluminum, indium, zinc, tin, fine particles having a particle size of 100 nm or less consisting of at least one oxide selected from antimony crosslinked by ionizing radiation. An anti-glare anti-reflection film characterized by comprising: (10) A polarizing plate, wherein the antiglare film according to any one of (1) to (9) is used as at least one of two protective films of a polarizing layer in the polarizing plate. (11) An image using the antiglare film according to any one of (1) to (9) or the antireflection layer of the antiglare polarizing plate according to (10) as the outermost layer of a display. Display device.

In order to prevent glare due to the lens effect, the focal point is increased by increasing the refractive index, as disclosed in JP-A-10-26428.
Although a method of designing further before 4, a method of aligning the positions of the focal points, a method of eliminating light condensing in the lens, and the like can be considered, a method of eliminating light condensing is the most effective as a drastic solution. The method of eliminating the light collection by the lens is achieved by preventing the straightness of light. That is, it is only necessary to prevent the light refracted by the lens having the uneven surface from traveling straight in the layer. This involves making the refractive index uneven inside,
In other words, whether the light is bent by the refractive index distribution type non-uniform structure,
Alternatively, a method of adding scatterers having different refractive indexes, that is, scattering particles, may be used. Above all, it is possible to provide an anti-glare film for high-definition image display in which glare is improved by using the internal scattering effect using scattering particles for simplicity.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic structure of an antiglare film and an antiglare antireflection film of the present invention will be described with reference to the drawings.

The embodiment shown in FIG. 1A is an example of the anti-glare film of the present invention, and has a layer structure of a transparent support 11 and an anti-glare layer 12 in this order. Numeral 13 denotes scattering particles, which have almost no irregularities on the surface because the average particle diameter is preferably one third or less of the film thickness. Further, in order to cause internal scattering, the difference in the refractive index between the binder forming the antiglare layer and the scattering particles is 0.03 or more, preferably 0.05 or more, and more preferably 0.1 or more. . Numeral 14 denotes anti-glare particles. Preferably, particles larger than one half of the film thickness occupy 40 to 100% of the whole particles. Can be.

The embodiment shown in FIG. 1 (b) is an example of the anti-glare film of the present invention. Unlike FIG. 1 (a), the anti-glare layer is divided into two layers, and the inner scattering layer 12a is provided on the support side. The anti-glare layer 12b is provided on the side. By dividing the antiglare layer into two layers as described above, it is possible to accurately control haze caused by internal scattering and haze caused by surface scattering.
In other words, since the haze is additive (if there is no change in unevenness), the haze of only 12a, that is, the haze caused by internal scattering is defined as Hi, and the haze at the time of coating up to 12b is defined as H. Is described by the following equation.

Hs = H-Hi

In order to independently control internal scattering, the difference in the refractive index between the binder forming the antiglare layer and the antiglare particles is preferably less than 0.03, preferably less than 0.02.

The embodiment shown in FIG. 1 (c) is an example of the antiglare film of the present invention. Unlike FIG. 1 (a), instead of the scattering particles and the antiglare particles, the scattering antiglare particles 15 are used. Used. This makes it difficult to independently control the haze caused by internal scattering and surface scattering, but it can be easily manufactured because only one kind of particles is required. The scattering antiglare particles have a refractive index difference of 0.03 or more, preferably 0.05 or more, more preferably 0.1 or more with respect to the binder forming the antiglare layer, and preferably 2 minutes of the film thickness. Particles larger than 1 account for 40 to 100% of the total particles.

The embodiment shown in FIG. 2 is an example of the antiglare antireflection film of the present invention. Reference numeral 21 denotes a low refractive index layer. In the antireflection layer, the low refractive index layer preferably satisfies the following expression.

Mλ / 4 × 0.7 <n1d1 <mλ / 4 × 1.3

Where m is a positive odd number (generally 1);
n1 is the refractive index of the low refractive index layer, and d1 is the thickness (nm) of the low refractive index layer.

The refractive index of the antiglare layer of the present invention is not described by one value. By adding the scattering particles, the entire anti-glare layer becomes a non-uniform refractive index layer in which the refractive index is not defined by one value. The non-uniform refractive index layer has improved the large amplitude in the wavelength dependence of the reflectance caused by the optical interference due to the difference in the refractive index between the antiglare layer and the support, and the resulting color unevenness.

It is preferable to use a plastic film as the transparent support. Examples of plastic film materials include cellulose esters (eg, triacetyl cellulose, diacetyl cellulose, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, nitrocellulose), polyamides, polycarbonates, polyesters (eg, polyethylene terephthalate, polyethylene naphthalate) , Poly-1,4-cyclohexane dimethylene terephthalate, polyethylene
1,2-diphenoxyethane-4,4′-dicarboxylate, polybutylene terephthalate), polystyrene (eg, syndiotactic polystyrene), polyolefin (eg, polypropylene, polyethylene, polymethylpentene), polysulfone, polyethersulfone , Polyarylates, polyetherimides, polymethyl methacrylates and polyether ketones. Triacetyl cellulose, polycarbonate, polyethylene terephthalate and polyethylene naphthalate are preferred.
The light transmittance of the transparent support is preferably 80% or more, and more preferably 86% or more. The haze of the transparent support is preferably 2.0% or less,
More preferably, it is 1.0% or less. The refractive index of the transparent support is preferably from 1.4 to 1.7.

From the viewpoint of use as a surface protective film of an image display device, triacetyl cellulose is used for LCDs, polyethylene terephthalate or polyethylene naphthalate is used for PDPs and CRTs, and those are used for rear projections and the like. Besides the support, polycarbonate is preferred.

The binder for forming the antiglare layer is not particularly limited. From the viewpoint of film formation, it is preferable that a high molecular weight compound is obtained by crosslinking a high molecular compound or a low molecular compound. Further, in order to use the antiglare layer on the surface of the image display device, it is necessary to impart a hard coat property to the antiglare layer because scratch resistance is required.

In order to impart a hard coat property to the antiglare layer, a polymer having a saturated hydrocarbon or polyether as a main chain is preferable, and a polymer having a saturated hydrocarbon as a main chain is more preferable. . 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.

Examples of the monomer having two or more ethylenically unsaturated groups include esters of polyhydric alcohol and (meth) acrylic acid (eg, ethylene glycol di (meth) acrylate, 1,4-dichlorohexane diacrylate) Pentaerythritol tetra (meth) acrylate), pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethanetri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta ( (Meth) acrylate, pentaerythritol hexa (meth) acrylate, 1,2,3-cyclohexanetetramethacrylate, polyurethane polyacrylate, polyester polyacrylate), vinylbenzene and the like Conductors (eg, 1,4-divinylbenzene, 4-vinylbenzoic acid-2-acryloylethyl ester, 1,4-divinylcyclohexanone), vinylsulfone (eg, divinylsulfone), acrylamide (eg, methylenebisacrylamide), and methacryl Amides are included. The polymer having a polyether as a main chain is preferably synthesized by a ring-opening polymerization reaction of a polyfunctional epoxy compound. These monomers having an ethylenically unsaturated group need to be cured by a polymerization reaction by ionizing radiation or heat after coating.

[0023] Instead of or in addition to the monomer having two or more ethylenically unsaturated groups, a crosslinked structure may be introduced into the binder polymer by a reaction of a crosslinkable group.
Examples of the crosslinkable functional group include an isocyanate group, an epoxy group, an aziridine group, an oxazoline group, an aldehyde group, a carbonyl group, a hydrazine group, a carboxyl group, a methylol group, and an active methylene group. Vinyl sulfonic acid, acid anhydride, cyanoacrylate derivative, melamine,
Metal alkoxides such as etherified methylols, esters and urethanes, and tetramethoxysilane can also be used as monomers for introducing a crosslinked structure. A functional group that exhibits crosslinkability as a result of a decomposition reaction, such as a block isocyanate group, may be used. Further, in the present invention, the cross-linking group is not limited to the above-mentioned compound, but may be one which shows reactivity as a result of decomposition of the above-mentioned functional group. These compounds having a cross-linking group need to be cross-linked by heat or the like after coating.

In order to increase the refractive index of the binder of the antiglare layer, a high-refractive-index monomer having a refractive index of 1.57 or more, preferably 1.65 or more can be used. Examples of the high refractive index monomer include bis (4-methacryloylthiophenyl) sulfide, vinylnaphthalene, vinylphenylsulfide, 4-methacryloxyphenyl-4′-methoxyphenylthioether and the like. The polymer having a polyether as a main chain is preferably synthesized by a ring-opening polymerization reaction of a polyfunctional epoxy compound. These monomers having an ethylenically unsaturated group need to be cured by a polymerization reaction by ionizing radiation or heat after coating.

In order to increase the refractive index of the binder of the antiglare layer, the particle size of at least one oxide selected from the group consisting of at least one oxide selected from titanium, aluminum, indium, zirconium, zinc, tin and antimony is 100 nm or less, preferably It is preferable to contain fine particles of 50 nm or less. Examples of the fine particles include TiO ₂ , Al ₂ O ₃ , In ₂ O ₃ , Z
nO, SnO ₂ , Sb ₂ O ₃ , ZrO ₂ , ITO and the like. The addition amount of the inorganic fine particles is preferably from 10 to 90% by weight, more preferably from 20 to 80% by weight, more preferably from 30 to 60% by weight based on the total weight of the hard coat layer.
Is particularly preferred.

The anti-glare layer has a bending resistance of the binder forming the anti-glare layer.
Having a refractive index different from the refractive index by 0.03 or more,
Scattering particles less than one-third of the thickness can be used
You. As mentioned above, these particles cause internal scattering
It is particularly limited as long as this condition is satisfied.
Absent. As the scattering particles, for example, polymethyl methacrylate
Rate resin, fluororesin, vinylidene fluoride resin, silicon
Cone resin, epoxy resin, nylon resin, polystyrene
Resin, phenolic resin, polyurethane resin,
Lil resin, cross-linked polystyrene resin, melamine resin, ben
Resin particles such as Zoguanamine resin or TiO _Two, Al_Two
O_Three, In_TwoO_Three, ZnO, SnO_Two, Sb_TwoO_Three, ITO,
ZrO_Two, MgF_Two, SiO_Two, Aluminosilicate, etc.
Inorganic particles. Particles are insoluble in water and organic solvents
Are preferred. The scattering particles added to the anti-glare layer
Combine two or more types of particles to control scattering
They may be used together.

The anti-glare layer has a grain size larger than half of the film thickness.
Particles having a diameter of 40 to 100% of the total particles.
Dazzling particles can be used. As mentioned above, this particle
Is for forming anti-glare properties by forming irregularities on the surface
There is no particular limitation as long as this condition is satisfied. Prevention
As the glare particles, for example, polymethyl methacrylate
Fat, fluororesin, vinylidene fluoride resin, silicone tree
Fat, epoxy resin, nylon resin, polystyrene resin,
Phenolic resin, polyurethane resin, cross-linked acrylic tree
Fat, cross-linked polystyrene resin, melamine resin, benzogua
Resin particles such as namin resin, or TiO _Two, Al_TwoO_Three,
In_TwoO_Three, ZnO, SnO_Two, Sb_TwoO_Three, ZrO_Two, IT
O, MgF_Two, SiO_TwoAnd inorganic particles such as aluminosilicate
Child. Particles are insoluble in water and organic solvents
preferable. Anti-glare particles to be added to the anti-glare layer
Combine two or more types of particles for control
It may be used.

In the anti-glare layer, particles having a refractive index different from that of the binder forming the anti-glare layer by 0.03 or more, and having a particle diameter larger than half of the film thickness, 40 to 1
Scattering and anti-glare particles occupying 00% can be used. As described above, these particles are for generating internal scattering and forming irregularities on the surface to impart antiglare properties, and are not particularly limited as long as the conditions are satisfied. Examples of the scattering anti-glare particles include polymethyl methacrylate resin, fluorine resin, vinylidene fluoride resin, silicone resin, epoxy resin, nylon resin, polystyrene resin, phenol resin, polyurethane resin, cross-linked acrylic resin, cross-linked polystyrene resin, and melamine. Resin, resin particles such as benzoguanamine resin, or TiO ₂ , Al ₂ O
₃ , In ₂ O ₃ , ZnO, SnO ₂ , Sb ₂ O ₃ , ZrO ₂ ,
Inorganic particles such as ITO, MgF ₂ , SiO ₂ , and aluminosilicate are exemplified. The particles are preferably insoluble in water and organic solvents. The scattering antiglare particles to be added to the antiglare layer,
Two or more types of particles may be used in combination to control internal scattering and surface irregularities.

The compound used for the low refractive index layer is a compound having a refractive index of 1.38 to 1.49, preferably a fluorine-containing compound. From the viewpoint of antifouling property and scratch resistance, the coefficient of dynamic friction is 0.03 to 0.15, and the contact angle to water is 90 to 1.
Fluorine-containing compounds that are crosslinked by heat or ionizing radiation at 20 ° are more preferred. It may be used in combination with other compounds in order to adjust coatability, film hardness and the like. Examples of the crosslinkable fluorine-containing compound include a fluorine-containing monomer and a crosslinkable fluorine-containing polymer, and a crosslinkable fluorine-containing polymer is preferable from the viewpoint of applicability.

Examples of the crosslinkable fluorine-containing polymer include a perfluoroalkyl group-containing silane compound (for example, (heptadecafluoro-1,1,2,2-tetradecyl) triethoxysilane) and the like, and a fluorine-containing monomer and a crosslinkable group. A fluorinated copolymer having a monomer for application as a constitutional unit is exemplified. Specific examples of the fluorine-containing monomer unit,
For example, a portion of fluoroolefins (eg, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoroethylene, hexafluoropropylene, perfluoro-2,2-dimethyl-1,3-dioxole), (meth) acrylic acid or Perfluorinated alkyl ester derivatives (for example, Biscoat 6F
M (manufactured by Osaka Organic Chemicals) and M-2020 (manufactured by Daikin)
Etc.), fully or partially fluorinated vinyl ethers, etc. As a monomer for providing a crosslinkable group, in addition to a (meth) acrylate monomer having a crosslinkable functional group in the molecule in advance such as glycidyl methacrylate, a monomer having a carboxyl group, a hydroxyl group, an amino group, a sulfonic acid group, etc. ) Acrylate monomers (for example, (meth) acrylic acid, methylol (meth) acrylate, hydroxyalkyl (meth) acrylate, allyl acrylate, etc.). It is known from JP-A-10-25388 and JP-A-10-147739 that the latter can introduce a crosslinked structure after copolymerization.

In addition to the above-mentioned polymer having a fluorine-containing monomer as a constitutional unit, a copolymer with a monomer containing no fluorine atom may be used. There is no particular limitation on the monomer units that can be used in combination. For example, olefins (ethylene, propylene, isoprene, vinyl chloride, vinylidene chloride, etc.), acrylates (methyl acrylate,
Methyl acrylate, ethyl acrylate, acrylic acid 2-
Ethylhexyl), methacrylates (methyl methacrylate, ethyl methacrylate, butyl methacrylate, ethylene glycol dimethacrylate, etc.), styrene derivatives (styrene, divinylbenzene, vinyltoluene, α-methylstyrene, etc.), vinyl ethers (methyl vinyl ether) Etc.), vinyl esters (vinyl acetate, vinyl propionate, vinyl cinnamate, etc.), acrylamides (N-tert-butylacrylamide, N-cyclohexylacrylamide, etc.), methacrylamides, acrylonitrile derivatives, and other commercial products As J
N-7219, JN-7221, and JN-7225 (all manufactured by JSR Corporation) can be mentioned. JN-7
219, JN-7221 and JN-7225 also have slipperiness, and from the viewpoint of achieving a balance between low refractive index, slipperiness, and antifouling properties, the low refractive index layer has JN-7219, JN-7221, and JN-7221.
JN-7225 is preferred.

Each layer of the antireflection film is formed by a dip coating method,
It can be formed by coating by an air knife coating method, a curtain coating method, a roller coating method, a wire bar coating method, a gravure coating method or an extrusion coating method (US Pat. No. 2,681,294). Two or more layers may be applied simultaneously. The method of simultaneous coating is described in U.S. Pat. Nos. 2,761,791 and 2,918,898.
Nos. 3,508,947 and 3,526,528, and in Yuji Harazaki, Coating Engineering, page 253, Asakura Shoten (1973).

The anti-reflection film includes a liquid crystal display (LCD),
The present invention is applied to an image display device such as a plasma display panel (PDP), an electroluminescence display (ELD), and a cathode ray tube display (CRT). When the antireflection film has a transparent support, the transparent support side is adhered to the image display surface of the image display device.

The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples.

[0035]

EXAMPLES (Preparation of coating liquid for internal scattering layer) A UV crosslinkable hard coat material (KZ-7874, manufactured by JSR Corporation) was added to a mixed solvent of 673.3 g of isopropanol and 146.7 g of methyl isobutyl ketone. After stirring, the mixture was filtered through a polypropylene filter having a pore size of 1 μm. The refractive index of the coating film obtained by applying this solution and curing with ultraviolet light was 1.50. Further, 4 g of titanium dioxide fine particles having an average particle diameter of 50 nm (TTO-55B, refractive index 2.7, manufactured by Ishihara Sangyo Co., Ltd.) was added and stirred to prepare a coating solution for an internal scattering layer.

(Preparation of Coating Solution A for Anti-Glare Layer) A UV crosslinkable hard coat material (KZ-7874, manufactured by JSR Corporation) was added to a mixed solvent of 673.3 g of isopropanol and 146.7 g of methyl isobutyl ketone. After stirring, the mixture was filtered through a polypropylene filter having a pore size of 1 μm. The refractive index of the coating film obtained by applying this solution and curing with ultraviolet light was 1.50. Further, crosslinked acrylic particles having an average particle size of 5.0 μm (MX-500H, manufactured by Soken Chemical Co., Ltd.)
1.3 g, crosslinked acrylic particles (MX
-300H, Soken Chemical Co., Ltd.) 5 g and average particle size 50
4 g of titanium dioxide fine particles (TTO-55B, refractive index 2.7, manufactured by Ishihara Sangyo Co., Ltd.) of 4 nm were added and stirred to prepare a coating solution A for an antiglare layer.

(Preparation of Coating Solution B for Antiglare Layer) A hard coat coating solution containing a zirconium oxide dispersion (KZ-7886A, a mixed solvent of 104.1 g of cyclohexanone and 61.3 g of methyl ethyl ketone) was stirred with an air disper.
217.0 g, manufactured by JSR Corporation). The refractive index of the coating film obtained by applying this solution and curing with ultraviolet light is 1.6.
It was one. Furthermore, crosslinked polystyrene particles having an average particle size of 2 μm (SX-200H, manufactured by Soken Chemical Co., Ltd.) are added to this solution.
5 g and an average particle size of 50 nm titanium dioxide fine particles (TT
8 g of O-55B, a refractive index of 2.7, manufactured by Ishihara Sangyo Co., Ltd.) was added, and the mixture was stirred and dispersed at 5,000 rpm for 1 hour with a high-speed disperser, and then filtered through a polypropylene filter having a pore size of 30 μm to form an antiglare layer. A coating solution B was prepared.

(Preparation of Coating Solution C for Antiglare Layer) 125 g of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA, manufactured by Nippon Kayaku Co., Ltd.), bis (4-methacryloylthiophenyl) sulfide ( MPSMA, manufactured by Sumitomo Seika Co., Ltd.)
125 g was dissolved in 439 g of a mixed solvent of methyl ethyl ketone / cyclohexanone = 50/50% by weight. A solution prepared by dissolving 5.0 g of a photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy) and 3.0 g of a photosensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.) in 49 g of methyl ethyl ketone was added to the obtained solution. added. The refractive index of the coating film obtained by applying this solution and curing with ultraviolet light was 1.60. Further, crosslinked polystyrene particles having an average particle size of 2 μm (SX-200H, manufactured by Soken Chemical Co., Ltd.) 10
g, and the mixture was stirred and dispersed at 5000 rpm for 1 hour with a high-speed disper, followed by filtration through a polypropylene filter having a pore diameter of 30 μm to prepare a coating liquid D for an antiglare layer.

(Preparation of Coating Solution D for Anti-Glare Layer) A UV crosslinkable hard coat material (KZ-7874, manufactured by JSR Corporation) was added to a mixed solvent of 673.3 g of isopropanol and 146.7 g of methyl isobutyl ketone. After stirring, the mixture was filtered through a polypropylene filter having a pore size of 1 μm. The refractive index of the coating film obtained by applying this solution and curing with ultraviolet light was 1.50. Further, crosslinked acrylic particles having an average particle size of 5.0 μm (SX-507, manufactured by Soken Chemical Co., Ltd.) 1
0 g was added and stirred to prepare a coating liquid D for an antiglare layer.

(Preparation of Coating Solution A for Low Refractive Index Layer) A thermally crosslinkable fluoropolymer having a refractive index of 1.46 (JN-722)
1. 200 g of methyl isobutyl ketone was added to 200 g of JSR Corporation, and the mixture was stirred and filtered with a polypropylene filter having a pore size of 1 μm to prepare a coating solution for a low refractive index layer.

Example 1 The above anti-glare layer coating solution A was coated on a triacetyl cellulose film (TAC-TD80U, manufactured by Fuji Photo Film Co., Ltd.) having a thickness of 80 μm using a bar coater. After drying at 120 ° C., 160
Using a W / cm air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.), the coating layer is cured by irradiating ultraviolet rays with an illuminance of 400 mW / cm ² and an irradiation amount of 300 mJ / cm ² , and a 3 μm-thick antiglare. A layer was formed. The particles having a particle diameter larger than 1.5 μm, which is one half of the thickness of the antiglare layer, are MX.
Both -500H and MX-300H are almost 100%.

Example 2 An undercoated polyethylene terephthalate film having a thickness of 188 μm (A-410)
0, manufactured by Toyobo Co., Ltd.) using a bar coater and applying the coating solution B for an antiglare layer.
Using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) of 0 W / cm, illuminance 400 mW / cm ² ,
The coating layer was cured by irradiating an ultraviolet ray having an irradiation amount of 300 mJ / cm 2 to form an antiglare layer having a thickness of 1.5 μm. Particles SX-200H having a particle diameter larger than 0.75 μm, which is one half of the thickness of the antiglare layer, are almost 100%.

Example 3 The above-mentioned coating solution for an internal scattering layer was coated on a triacetyl cellulose film (TAC-TD80U, manufactured by Fuji Photo Film Co., Ltd.) having a thickness of 80 μm using a bar coater. After drying at ℃
Using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) of 0 W / cm, illuminance 400 mW / cm ² ,
The coating layer was cured by irradiating an ultraviolet ray having an irradiation amount of 300 mJ / cm ² to form an internal scattering layer having a thickness of 3 μm. The coating solution C for an anti-glare layer was coated thereon using a bar coater, dried at 120 ° C., and then illuminated using a 160 W / cm air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.). 400 mW / cm ² , irradiation dose 300 mJ / c
m ² UV light to cure the coating layer, and
An anti-glare layer having a thickness of μm was formed. The particles SX-200H having a particle size larger than 0.75 μm, which is one half of the thickness of the antiglare layer, are almost 100%. The coating solution A for a low refractive index layer was coated thereon using a bar coater, dried at 80 ° C., and thermally crosslinked at 120 ° C. for 10 minutes to form a layer having a thickness of 0.09.
A 6 μm low refractive index layer was formed.

Example 4 The above anti-glare layer coating solution D was applied to a 80 μm-thick triacetyl cellulose film (TAC-TD80U, manufactured by Fuji Photo Film Co., Ltd.) using a bar coater. After drying at 120 ° C., 160
Using a W / cm air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.), the applied layer is cured by irradiating ultraviolet rays with an illuminance of 400 mW / cm ² and an irradiation amount of 300 mJ / cm ² , and has a thickness of 5 μm. A layer was formed. Particles SX having a particle size larger than 2.5 μm, which is half the thickness of the antiglare layer
-507 is almost 100%. The coating liquid A for a low refractive index layer was applied thereon using a bar coater,
, And then thermally crosslinked at 120 ° C. for 10 minutes to form a low refractive index layer having a thickness of 0.096 μm.

Comparative Example 1 Comparative Example 1 was prepared in the same manner as in Example 1 except that fine titanium dioxide particles were not added.

Comparative Example 2 Comparative Example 2 was made in the same manner as in Example 2 except that the thickness of the antiglare layer was changed to 5 μm. Particles SX-200H having a particle diameter larger than 2.5 μm, which is one half of the thickness of the antiglare layer, are less than 10%.

Comparative Example 3 Comparative Example 3 was carried out in the same manner as in Example 3 except that no titanium dioxide fine particles were added to the internal scattering layer.
It was created.

(Evaluation of anti-glare film) The following items were evaluated for the obtained film. (1) Haze The haze of the obtained film was measured using a haze meter MODEL.
It measured using 1001DP (made by Nippon Denshoku Industries Co., Ltd.). The haze was also measured with the haze of only the scattering particles, and separated into haze caused by internal scattering and haze caused by surface scattering. (2) Pencil hardness evaluation A pencil hardness evaluation described in JIS K 5400 was performed as an index of scratch resistance. Antireflection film at a temperature of 25 ° C and a humidity of 60
% RH for 2 hours, using a 3H test pencil specified in JIS S 6006, with a load of 1 kg, and no scratches are observed in the evaluation of n = 5: ○ In the evaluation of n = 5 1 or 2 scratches: ３ 3 or more scratches in the evaluation of n = 5: × (3) Average reflectance For the antiglare antireflection film, using a spectrophotometer (manufactured by JASCO Corporation) In the wavelength range of 380 to 780 nm, the spectral reflectance at an incident angle of 5 ° was measured.
The average reflectance of 450 to 650 nm was used for the results. (4) Evaluation of contact angle and fingerprint adhesion Regarding the anti-glare anti-reflection film, an optical material was measured at a temperature of 25 ° C. and a humidity of 60% RH as an index of surface contamination resistance.
After conditioning for a period of time, the contact angle with water was measured. After attaching a fingerprint to the sample surface, the sample was wiped off with a cleaning cloth to observe the state, and the fingerprint adhesion was evaluated as follows. Fingerprints can be completely wiped off: ○ Fingerprints can be seen slightly: △ Fingerprints can hardly be wiped off: ×

(5) Measurement of Dynamic Friction Coefficient For the antiglare antireflection film, an index of the surface slip property and
And evaluated by the dynamic friction coefficient. The coefficient of kinetic friction was 25 for the sample.
After conditioning for 2 hours at 60 ° C and 60% relative humidity, HEIDON
-14Dynamic friction measuring machine, 5mmφ stainless steel ball, load
Use the value measured at a weight of 100 g and speed of 60 cm / min
Was. (6) Evaluation of anti-glare property Exposed fluorescence without louver on the prepared anti-glare film
Light (8000 cd / m ^Two) And the reflection image is blurred
The degree was evaluated based on the following criteria. The outline of the fluorescent lamp is not known at all: ◎ The outline of the fluorescent lamp is slightly recognized: ○ The fluorescent lamp is blurred, but the outline can be identified: △ The fluorescent lamp hardly blurs: × (7) Glare evaluation Light diffuser with louver on conductive film
And the glare on the surface was evaluated according to the following criteria. Little glare is observed: ○ Slight glare: Δ Glitter of a size recognizable by eyes: × Table 1 shows the results of Examples and Comparative Examples.

[0050]

[Table 1]

The breakdown of the haze in Example 4 was as follows. By setting the thickness of the antiglare layer to 30 μm, the surface roughness was almost eliminated, and only the internal scattering was obtained.

Next, an antiglare antireflection polarizing plate was prepared using the film of Example 3. When a liquid crystal display device in which an antireflection layer was disposed on the outermost layer was prepared using this polarizing plate, an excellent contrast was obtained because there was no reflection of external light, and a reflection image was inconspicuous due to antiglare properties. It had visibility. There was almost no glare of the pixels.

[0053]

According to the present invention, an antiglare film suitable for a high-definition image display device can be supplied at a low cost by stably producing the film using a simple method.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing a typical layer configuration of an antiglare film. (B) It is sectional drawing which shows the typical layer structure of an anti-glare film. (C) It is sectional drawing which shows the typical layer constitution of an antiglare film.

FIG. 2 is a cross-sectional view showing a typical layer configuration of an antiglare antireflection film.

[Explanation of symbols]

 Reference Signs List 11 transparent support 12 antiglare layer 12a internal scattering layer 12b antiglare layer 13 scattering particles 14 antiglare particles 15 scattering antiglare particles 21 low refractive index layer

Claims (11)

[Claims] 1. An optical film having an antiglare layer on a transparent support, wherein the haze of the antiglare layer is 4.0 to 50.0.
%, Wherein the haze is a total of internal scattering of 1.0% or more and surface scattering of 3.0% or more. 2. The scattering particles wherein the anti-glare layer has a refractive index different from that of a binder forming the anti-glare layer by 0.03 or more, and has an average particle diameter of 1/3 or less of the film thickness. The anti-glare film according to claim 1, comprising: 3. The anti-glare layer is characterized in that particles having a particle size larger than half of the film thickness contain anti-glare particles occupying 40 to 100% of the whole particles. The antiglare antireflection film according to claim 1. 4. The anti-glare layer has a refractive index different from that of a binder forming the anti-glare layer by 0.03 or more, and has a thickness of 2
2. The anti-glare anti-reflection film according to claim 1, wherein the particles having a particle size larger than one part comprise scattering anti-glare particles occupying 40 to 100% of the whole particles. 5. An antiglare hard coat layer, wherein the material forming the antiglare layer according to claim 1 is an antiglare hard coat layer comprising a monomer having two or more ethylenically unsaturated groups. Coat film. 6. A low refractive index layer having a refractive index of 1.38 to 1.49 directly or via another layer on the antiglare layer according to any one of claims 1 to 5. Anti-glare anti-reflection film. 7. The low refractive index layer comprises a fluorine-containing compound which is crosslinked by heat or ionizing radiation having a dynamic friction coefficient of 0.03 to 0.15 and a contact angle to water of 90 to 120 °. Item 7. An antiglare antireflection film according to item 6. 8. An antiglare antireflection film, wherein the binder forming the antiglare layer according to claim 6 or 7 has a refractive index of 1.57 to 2.00. 9. The binder for forming the antiglare layer according to claim 8, wherein the binder having two or more ethylenically unsaturated groups and at least one selected from titanium, aluminum, indium, zinc, tin, and antimony. An anti-glare anti-reflection film comprising: a material obtained by crosslinking fine particles having a particle diameter of 100 nm or less made of two oxides with ionizing radiation. 10. A polarizing plate, wherein the anti-glare film according to claim 1 is used as at least one of two protective films of a polarizing layer in the polarizing plate. 11. An image characterized in that the anti-glare film according to claim 1 or the anti-reflection layer of the anti-glare polarizing plate according to claim 10 is used as the outermost layer of a display. Display device.