JP2002370302A - Glare-free hard coat film and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glare-free film and a glare-free reflection preventing film both of which are simple and inexpensive and have sufficient reflection preventing properties, glare preventing properties and high detailedness by forming a glare-free hard coat layer and a low refractive index layer on a transparent support and an image display device using the film excellent in the above mentioned characteristics. SOLUTION: The glare-free hard coat film is obtained by providing at least one glare-free hard coat layer, which contains particles with a mean particle size of 0.3-10.0 μm so that the mean particle size d (μm) and the number of particles per an area A (μm<2> ) on the film satisfy the numerical formula; A/24<=3n(d/2)<2> <=A/10, on the transparent support. The image display device having this film mounted thereon is also disclosed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard coat film having an antiglare property and an image display device using the same.

[0002]

2. Description of the Related Art Generally, in an image display device such as a CRT, a PDP, and an LCD, an antiglare antireflection film is used.
It is arranged on the outermost surface of the display for the purpose of preventing a decrease in contrast and reflection of an image due to reflection of external light. On the other hand, in image display devices, it is desired to improve the display quality (high definition) by reducing the pixel size as much as possible, and it is necessary to develop an antiglare antireflection film corresponding to this. Was.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple and inexpensive and sufficient antireflection property by forming at least one antiglare hard coat layer and a low refractive index layer on a transparent support. Another object of the present invention is to provide an antiglare film having an antiglare property and high definition and an antiglare antireflection film. Another object of the present invention is to provide an image display device using a film having the above characteristics.

[0004]

The object of the present invention is achieved by an antiglare hard coat film and an image display device having the following constitution. 1. An anti-glare hard coat film having at least one anti-glare hard coat layer on a transparent support, wherein the anti-glare hard coat layer has an average particle size of 0.3 to 10.0 μm.
m, and the average particle diameter d (μm) and the number n of particles per area A (μm ² ) on the film are represented by the following formula (1).
An antiglare hard coat film characterized by satisfying the following. Formula (1): A / 24 ≦ 3n (d / 2) ² ≦ A / 10 2.1 × 10 ⁴ μm ² An average particle diameter of 0.3 to 10.0 μm in the antiglare hard coat layer in an area of 2.1 × 10 ⁴ μm ² . In the distribution of the distance between two different points obtained from the center coordinates of the particles, 0.2 μ
2. The antiglare hard coat film as described in 1 above, wherein the peak of the histogram in the m section is in the range of 30 to 80 μm. 3. A refractive index of 1.38 to 1.
3. The antiglare hard coat film according to the above 1 or 2, which has a low refractive index layer of No. 49. 4. An image display device, wherein the antiglare hard coat film according to any one of the above 1 to 3 is arranged on a display surface.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic constitution of an antiglare hard coat film of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view schematically showing one example of the antiglare hard coat film of the present invention. In FIG. 1, the antiglare hard coat film has a layer structure in the order of a transparent support 1, an antiglare hard coat layer 2, and a low refractive index layer 3. The particles 4 are contained in the antiglare hard coat layer 2. The material other than the particles 4 of the antiglare hard coat layer 2 preferably has a refractive index of 1.57 to 2.00, and the low refractive index layer 3 has a refractive index of preferably 1.38 to 1.49. The antiglare hard coat layer 2 may be composed of a plurality of layers.

Hereinafter, each layer constituting the antiglare hard coat film of the present invention will be described.

[Anti-glare hard coat layer] The refractive index of the anti-glare hard coat layer of the present invention is not described by a single value, and the average particle size of the material forming the anti-glare hard coat layer is not more than 0.1. 3
This is a non-uniform refractive index layer in which particles of about 10.0 μm are dispersed. The material forming the antiglare hard coat layer preferably has a refractive index of 1.57 to 2.00.

The antiglare hard coat layer according to the present invention is preferably free from the influence of optical interference in the hard coat layer because internal scattering is caused by fine particles dispersed in a high refractive index material. In the high refractive index hard coat layer without fine particles, a large amplitude of the reflectance is seen in the wavelength dependence of the reflectance due to the optical interference due to the refractive index difference between the hard coat layer and the support, and as a result, the antireflection is prevented. There is a disadvantage that the effect deteriorates and color unevenness occurs at the same time.

The high refractive index material used for the antiglare hard coat layer is preferably a polymer having a saturated hydrocarbon or 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. In order to obtain a high refractive index, the structure of the monomer preferably contains at least one selected from an aromatic ring, a halogen atom other than fluorine, sulfur, phosphorus, and nitrogen.

Examples of the monomer having two or more ethylenically unsaturated groups include esters of a polyhydric alcohol and (meth) acrylic acid (eg, ethylene glycol di (meth) acrylate, 1,4-dichlorohexane diester). Acrylate, 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 (Eg, 1,4-divinylbenzene, 4-vinylbenzoic acid-2-acryloylethyl ester, 1,4-divinylcyclohexanone), vinylsulfone (eg, divinylsulfone), acrylamide (eg, methylenebisacrylamide) and Methacrylamide is included. 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.

[0011] 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, 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.

The antiglare hard coat layer has at least one selected from titanium, aluminum, indium, zinc, tin, antimony and zirconium in order to increase the refractive index of the material forming the antiglare hard coat layer. It is preferable to contain fine particles having a particle size of 100 nm or less, preferably 50 nm or less, composed of two metal oxides. Such a material does not scatter because the particle diameter of the fine particles is sufficiently smaller than the wavelength of light, and behaves as an optically uniform substance (see JP-A-8-110401). Examples of the fine particles include TiO ₂ , Al ₂ O ₃ , In ₂ O ₃ , ZnO, S
nO ₂ , Sb ₂ O ₃ , ITO, ZrO _{2 and the} like. The addition amount of the metal oxide fine particles is preferably 10 to 90% by mass based on the total weight of the hard-coating antiglare layer.
The content is more preferably 0 to 80% by mass, and particularly preferably 30 to 60% by mass.

The anti-glare hard coat layer has an average particle size of 0.3 to 10.0 μm for the purpose of imparting anti-glare properties, preventing deterioration in reflectance due to interference of the anti-glare hard coat layer, and preventing color unevenness. Inorganic compound or organic polymer particles are used, for example, silica particles, TiO ₂ particles, Al ₂ O ₃ particles, cross-linked acrylic particles, cross-linked styrene particles, melamine resin particles, benzoguanamine resin particles, cross-linked siloxane particles and the like are preferably used. Can be From the viewpoint of good dispersion stability of the particles in the coating solution for the antiglare hard coat layer (due to good affinity with the binder) and good sedimentation stability (due to low specific gravity) during production, the organic high Molecular particles are more preferred. The average particle size of the particles is 0.3 to 10.0 μm, more preferably 0.5 to 5.0 μm, and 1.0 to 3.0 μm.
0 μm is more preferred. As the shape of the particles, any of a spherical shape and an amorphous shape can be used, but a spherical shape is preferable in order to obtain stable antiglare properties. Two or more different particles may be used in combination.

The particles having an average particle diameter of 0.3 to 10.0 μm have an average particle diameter d (μm) and an area A (μm) on the film.
m ² ) The number of particles n (pieces) of the heat satisfies the following equation (1). Formula (1): A / 24 ≦ 3n (d / 2) ² ≦ A / 10 For example, if the particle diameter is 2 μm, the area is 10,000 μ.
The number n of particles per m ² is 10,000 / (24 ×
3) ≦ n ≦ 10,000 / (10 × 3), that is, 139
≦ n ≦ 333. When a plurality of types of particles having different sizes are present, the number average particle size is taken. For example, there are 60 particles of 2.5 μm and 40 particles of 1.5 μm per 10,000 μm ² , and a total of 100 particles.
In the case of a mixed system in which the number of particles is present, the number average particle diameter is obtained, and the average particle diameter d = (2.5 × 60 + 1.5 × 40) /
100 = 2.1 μm. When the particle diameter d is 2.1 μm, the number of particles is 10,000 / (24 × 3 × 1.05 ×
1.05) ≦ n ≦ 10,000 / (10 × 3 × 1.05)
× 1.05), that is, 126 ≦ n ≦ 302, so that this system in which 100 particles exist per 10,000 μm ² does not satisfy the above formula (1). By increasing the number of particles until the above expression (1) is satisfied, high definition is improved. If the number of particles is too small to satisfy the above formula (1), the anti-glare property and high definition deteriorate, and unevenness based on interference fringes tends to occur. If the number of particles is too large, the anti-glare property decreases. However, the contrast is lowered, which is not preferable in any case.

It is preferable to use, as the above-mentioned particles, particles having a particle diameter larger than one third of the thickness of the antiglare hard coat layer. The average particle size is measured by a Coulter counter method, a centrifugal sedimentation method or the like. The thickness of the antiglare hard coat layer is preferably 2 to 10 μm, more preferably 3 to 6 μm.

The average particle size of the antiglare hard coat layer in the area of 100 × 100 μm ² is 0.3 to 10.0.
In the distribution of the distance between two different points obtained from the central coordinates of the particles of μm, when a histogram of 0.2 μm section is taken, it is preferable that the peak is in the range of 30 to 80 μm. Here, the area is an area when the hard coat layer is viewed from above, and covers particles having an average particle diameter of 0.3 to 10.0 μm existing in the hard coat layer in an area of 10,000 μm ² . The center coordinates of the particles may use the center of gravity. As a result of the inventor's intense efforts to improve the high definition, it was found that factors such as the distance between the peaks and the distribution of the uneven shape in the unevenness on the surface of the hard coat layer were factors. When this is quantitatively displayed, the above description is obtained. The factor that changes the peak of the histogram is the shape of the surface irregularities, which is determined when the irregularities are formed by the particles. If the repulsive force between the particles is strong, regularity is generated in the arrangement of the particles, and it becomes difficult to form irregularities. When the repulsive force increases, a peak appears in a small range of the radial distribution function, for example, below 30 μm. In such a case, it is not possible to form a surface having both antiglare property and high definition. Changing the type of particles can change the repulsion between the particles, but is also affected by the solvent used, drying conditions after coating, and the like.

The present inventors have further developed this and developed a method of simulating surface irregularities from the formulation of a coating solution and drying conditions to obtain the surface performance obtained by the simulation. This will be described. Coating liquid formulation,
In the method of simulating surface irregularities from drying conditions, a potential is assumed for particles, and a surface is produced in accordance with the above radial distribution function. From the obtained surface shape, C
Using the ray tracing simulation method usually used in G, the shape of the pixel when the pixel passing through the surface enters the eye is determined, and the uniformity of the brightness is examined. It has been found from this simulation that a surface excellent in both antiglare properties and high definition can be obtained if the above-mentioned formula (1) and the conditions of the histogram peak are satisfied.

In the present invention, the average particle size is 0.3 to 10 μm
Containing no particles, to increase the refractive index and the material forming the antiglare hard coat layer described above, titanium, aluminum, indium, zinc, tin, antimony, at least one metal selected from zirconium It may have a hard coat layer composed of fine particles having a particle diameter of 100 nm or less, preferably 50 nm or less, composed of an oxide.
In this case, the examples and the mixing ratios of the fine particles are the same as those described above. Such a hard coat layer is preferably provided as a lower layer of the antiglare hard coat layer containing particles having an average particle diameter of 0.3 to 10 μm.

[Low Refractive Index Layer] The low refractive index layer preferably satisfies the following expression (2). Formula (2): (mλ / 4) × 0.7 <n ₁ d ₁ <(mλ /
4) × 1.3 (where m is a positive odd number (generally 1), n ₁ is the refractive index of the low refractive index layer, and d ₁ is the thickness of the low refractive index layer (n
m), and λ is light having a wavelength of 350 to 800 nm.

The low refractive index layer has a dynamic friction coefficient of 0.03 to
0.15, a fluorine-containing compound and inorganic fine particles which are crosslinked by heat or ionizing radiation and have a contact angle with water in the range of 90 ° to 120 ° are used.

As the crosslinkable fluoropolymer compound used for the low refractive index layer, a perfluoroalkyl group-containing silane compound (for example, (heptadecafluoro-1,1,2,2,3)
In addition to 2-tetradecyl) triethoxysilane) and the like, a fluorinated copolymer having a fluorinated monomer and a monomer for imparting a crosslinkable group as a constitutional unit is exemplified. 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-dioxole, etc.), partially or fully fluorinated alkyl ester derivatives of (meth) acrylic acid (for example, Biscoat 6FM (manufactured by Osaka Organic Chemical) or M
-2020 (manufactured by Daikin)) and fully or partially fluorinated vinyl ethers. 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 carboxyl group or a hydroxyl group,
Examples include (meth) acrylate monomers having an amino group, a sulfonic acid group, and the like (for example, (meth) acrylic acid, methylol (meth) acrylate, hydroxyalkyl (meth) acrylate, allyl acrylate, and the like). The latter can introduce a crosslinked structure after copolymerization.
0-25388 and JP-A-10-147739
No., published in Japanese Unexamined Patent Publication No.

In addition to the polymer having the above-mentioned 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.), styrenes (styrene, divinylbenzene, vinyltoluene,
α-methylstyrene, etc.), vinyl ethers (eg, methyl vinyl ether), vinyl esters (eg, vinyl acetate, vinyl propionate, vinyl cinnamate), acrylamides (eg, N-tertbutylacrylamide, N-cyclohexylacrylamide), methacrylamide And acrylonitrile derivatives.

As the inorganic fine particles used for the low refractive index layer, amorphous fine particles are preferably used, and are preferably made of metal oxides, nitrides, sulfides or halides, and metal oxides are particularly preferable. As a metal atom, N
a, K, Mg, Ca, Ba, Al, Zn, Fe, Cu,
Ti, Sn, In, W, Y, Sb, Mn, Ga, V, N
b, Ta, Ag, Si, B, Bi, Mo, Ce, Cd,
Be, Pb and Ni are preferred, and Mg, Ca, B and Si are more preferred. An inorganic compound containing two kinds of metals may be used. A particularly preferred inorganic compound is silicon dioxide, ie, silica. The average particle diameter of the inorganic fine particles is preferably from 0.001 to 0.2 μm, and more preferably from 0.005 to 0.05 μm. The particle diameter of the fine particles is preferably as uniform (monodispersed) as possible. The addition amount of the inorganic fine particles is preferably 5 to 90% by mass of the total weight of the low refractive index layer, and is preferably 10 to 70% by mass.
%, More preferably 20 to 50% by mass.

The inorganic fine particles are preferably subjected to a surface treatment before use. As the surface treatment method, there are a physical surface treatment such as a plasma discharge treatment and a corona discharge treatment and a chemical surface treatment using a coupling agent, but the use of a coupling agent is preferred. As the coupling agent, an organoalkoxy metal compound (eg, a titanium coupling agent,
Silane coupling agent) is preferably used. When the inorganic fine particles are silica, silane coupling treatment is particularly effective.

[Transparent Support] As the transparent support, a plastic film is preferably used. Examples of the polymer forming the plastic film include cellulose ester (eg, triacetyl cellulose, diacetyl cellulose), polyamide, polycarbonate, polyester (eg, polyethylene terephthalate, polyethylene naphthalate), polystyrene, polyolefin, and the like. Of these, triacetyl cellulose, polyethylene terephthalate, and polyethylene naphthalate are preferred. When the antiglare hard coat film of the present invention is used for a liquid crystal display device, it is disposed on the outermost surface of the display by providing an adhesive layer on one surface. When the transparent support is triacetyl cellulose, since triacetyl cellulose is used as a protective film for protecting the polarizing layer of the polarizing plate, it is costly to use the antiglare hard coat film of the present invention as it is as the protective film. Is preferred.

[Formation, Physical Properties and Use of Antiglare Hard Coat Film] Each layer of the antiglare hard coat film is formed by a dip coating method, an air knife coating method, a curtain coating method, a roller coating method, a wire bar coating method, It can be formed by coating by a gravure coating method or an extrusion coating method (US Pat. No. 2,681,294). Two or more layers may be applied simultaneously. For the method of simultaneous coating, see US Pat.
Nos. 1791, 2941898 and 3508947
No. 3526528 and Yuji Harazaki,
Coating Engineering, page 253, described in Asakura Shoten (1973).

The haze of the antiglare hard coat film is as follows:
When the particles have the same refractive index as the binder (including the case where the difference is less than 0.10), it is preferably 0% to 18%, more preferably 0% to 15%. When the particles have a refractive index different from that of the binder (the difference is preferably 0.10 or more),
It is preferably from 15% to 80%, more preferably from 20% to
65%.

The antiglare hard coat film of the present invention can be used for a liquid crystal display (LCD), a plasma display panel (PD).
P), electroluminescent display (EL)
It can be applied to an image display device such as D) or a cathode ray tube display (CRT) as an antireflection film. in this case,
The transparent support side is adhered to the image display surface of the image display device.

[0029]

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

Experimental Example 1 (Preparation of Coating Solution A for Hard Coat Layer) A mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (trade name: DPHA, manufactured by Nippon Kayaku Co., Ltd.) was mixed with 250 g of 439 g of methyl ethyl ketone. / Cyclohexanone = 50/50 (mass ratio) in a mixed solvent. 7.5 g of a photopolymerization initiator (trade name: Irgacure 907, manufactured by Ciba Geigy) was added to the obtained solution.
A solution of 5.0 g of a photosensitizer (trade name: Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.) in 49 g of methyl ethyl ketone was added. This solution was filtered through a polypropylene filter having a pore size of 3 μm, and then applied and cured with ultraviolet light. The resulting coating film had a refractive index of 1.53 and a thickness of 4 μm.
Met.

(Preparation of Coating Solution B for Antiglare Hard Coat Layer) 4165 parts by mass of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (trade name: DPHA, manufactured by Nippon Kayaku Co., Ltd.), zirconium oxide 9941 parts by mass of a dispersion-containing hard coat coating solution (trade name: Z-7401, manufactured by JSR Corporation),
1029 parts by mass of methyl ethyl ketone, 3099 parts by mass of cyclohexanone, and 452 parts by mass of a photopolymerization initiator (trade name: Irgacure 907, manufactured by Ciba Geigy) were added.
Further, a dispersion of crosslinked polystyrene particles having an average particle size of 2 μm (particles: SX-200H, particles / methyl ethyl ketone / cyclohexanone = 20%, manufactured by Soken Chemical Co., Ltd.) was added to this solution.
/ 40/40% by mass) was added, and the mixture was sufficiently stirred and mixed with an air disper, and then filtered through a polypropylene filter having a pore size of 3 μm to prepare a coating liquid for an antiglare high refractive index layer. The refractive index of the coating film obtained by applying this solution and curing with ultraviolet light and the refractive index of the crosslinked polystyrene particles were both 1.61 and the film thickness was 1.4 μm.

(Preparation of Coating Solution A for Low Refractive Index Layer) A thermally crosslinkable fluoropolymer having a refractive index of 1.43 (trade name: JN-
7228, solid content concentration 6% by mass, solvent is methyl ethyl ketone, 200 parts by mass of JSR Corporation, silica sol (trade name: MEK-ST, average particle diameter 10 to 20 nm, solid content concentration 30% by mass, solvent is methyl ethyl ketone, 17 parts by mass of Nissan Chemical Co., Ltd., and the remaining 183 parts by mass of methyl ethyl ketone and cyclohexanone such that the weight composition ratio of methyl ethyl ketone and cyclohexanone in the coating solution solvent becomes 90:10, and after stirring, made of polypropylene having a pore diameter of 1 μm The mixture was filtered with a filter to prepare a coating solution for a low refractive index layer.

[Sample 1] The above-mentioned hard coat layer coating solution A was coated on a triacetyl cellulose support (TD-80UF manufactured by Fuji Photo Film Co., Ltd.) using a bar coater.
After drying at 120 ° C., using a 160 W / cm air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.),
The coating layer was cured by irradiating ultraviolet rays having an illuminance of 400 mW / cm ² and an irradiation amount of 300 mJ / cm ² to form a hard coat layer having a thickness of 4 μm. The anti-glare hard coat layer coating solution B was applied thereon using a bar coater, dried and cured under the same conditions as the hard coat layer, to give an anti-glare property having a thickness of about 1.4 μm. A hard coat layer was formed. 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 low refractive index layer having a thickness of 0.096 μm. Formed. This sample corresponds to a sample in which another hard coat layer formed with the hard coat layer coating solution A is formed between the support 1 and the anti-glare high refractive index layer 2 in FIG. Sample 1 has a particle size of 2 μm, and the number of particles existing at 10,000 μm ² is 140, which satisfies the formula (1). This is done by taking 5 visual fields with an optical microscope, counting the number of particles,
This is the average number.

[Sample 2] A sample was prepared in the same manner as in Sample 1, except that the number of particles of the antiglare hard coat layer was 300 per 10,000 μm ² . This sample satisfies Equation (1).

[Sample 3] A sample was prepared in the same manner as in Sample 1, except that the number of particles in the antiglare hard coat layer was 400 per 10,000 μm ² . This sample does not satisfy Expression (1) because the number of particles is too large.

[Sample 4] A sample was prepared in the same manner as in Sample 1, except that the particles of the antiglare hard coat layer were 2.8 μm and 60 particles per 10,000 μm ² . This sample does not satisfy Expression (1) because the number of particles is too small.

[Sample 5] A sample was prepared in the same manner as in Sample 1, except that the particles of the antiglare hard coat layer were 2.8 μm and 80 particles per 10,000 μm ² . This sample satisfies Equation (1).

[Sample 6] A sample was prepared in the same manner as in Sample 1, except that the particles of the antiglare hard coat layer were changed to 2.8 μm and to 150 particles per 10,000 μm ² . This sample satisfies Equation (1).

[Sample 7] A sample was prepared in the same manner as in Sample 1, except that the particles of the antiglare hard coat layer were 2.8 µm and 180 particles per 10,000 µm ² . This sample does not satisfy Expression (1) because the number of particles is too large.

[Sample 8] A mixture of 2.5 μm and 1.5 μm particles of the antiglare hard coat layer was used for 10,000.
Each sample was prepared in the same manner as in Sample 1, except that a total of 102 pieces, 66 pieces and 36 pieces, were used per μm ² . The average particle size at this time is 2.15 μm. This sample does not satisfy Expression (1) because the number of particles is too small.

[Sample 9] The particles of the antiglare hard coat layer were mixed in a mixed system of 2.5 μm and 1.5 μm to 10,000.
Each sample was manufactured in the same manner as in Sample 1 except that the total number was 83 pieces and 45 pieces per μm ² , that is, 128 pieces in total. The average particle size at this time is 2.15 μm. This sample satisfies Equation (1).

[Sample 10] The particles of the antiglare hard coat layer were mixed in a mixed system of 2.5 μm and 1.5 μm to form a mixture of 10,000 μm.
For each 0 μm ² , 130 pieces and 70 pieces in total 200
Except that it was made into individual pieces, it was produced in the same manner as in Sample 1. The average particle size at this time is 2.15 μm. This sample is expressed by the formula (1)
Meet.

[Sample 11] The particles of the antiglare hard coat layer were mixed in a mixed system of 2.5 μm and 1.5 μm for 10,000 hours.
194, 106 pieces per 0 μm ² total 300
Except that it was made into individual pieces, it was produced in the same manner as in Sample 1. The average particle size at this time is 2.15 μm. This sample does not satisfy Expression (1) because the number of particles is too large.

(Evaluation of antiglare hard coat film) The following items were evaluated for the produced antiglare hard coat film. (1) Evaluation of antiglare property A bare fluorescent lamp (8000 cd / cm ² ) without a louver was projected on the produced antiglare hard coat film, and the degree of blurring of the reflected image was evaluated according to the following criteria. The following X is an unusable level. The outline of the fluorescent lamp is almost unclear: ○ The fluorescent lamp is blurred, but the outline can be identified: な い The fluorescent lamp is hardly blurred: ×

(2) Evaluation of suitability for high-definition monitor To evaluate the suitability of the hard-coated antiglare film for high-definition monitor, an antiglare hard coat film prepared so as to be in close contact with a display corresponding to UXGA 15 inches. Was carried out, and a visual sensory evaluation was performed according to the following criteria. The following X is an unusable level. Totally almost no glare: ○ There is a little glare: △ Glare can be clearly recognized: ×

(3) Average Reflectance The prepared antiglare hard coat film was measured at 380 to 780 nm using a spectrophotometer (manufactured by JASCO Corporation).
, The spectral reflectance at an incident angle of 5 ° was measured. The average reflectance of 450 to 650 nm was used for the results.

Table 1 shows the evaluation results of the antiglare hard coat film produced in Experimental Example 1.

[0048]

[Table 1]

From the results shown in Table 1, it can be seen that each of the antiglare hard coat films of the present invention is an antiglare antireflection film that can be used for a high-definition monitor.

Experimental Example 2 Next, 1029 parts by mass of MEK and 3099 parts of cyclohexanone were used as the solvent for the coating solution B for the antiglare hard coat layer in Experimental Example 1.
From parts by mass, 1029 parts by mass of MEK, MIBK309
Sample 12 was prepared in the same manner as Sample 1 of Experimental Example 1 except that the amount was changed to 9 parts by mass. In the distribution of the distance between two different points determined from the center coordinates of the particles in the antiglare hard coat layer from the surface shape data of Sample 1 and Sample 12, 0.2 μm
An interval histogram was obtained. The histogram of Sample 1 is shown in FIG. 2, and the histogram of Sample 12 is shown in FIG. Sample 1
Indicates that the peak of the histogram is between 30 and 80 μm, but the sample 12 has a peak at 30 μm or less. Table 2 shows the performance of these samples.

[0051]

[Table 2]

As can be seen from Table 2, Sample 1 having a histogram peak between 30 and 80 μm shows better performance in terms of high definition than Sample 12 having a peak below 30 μm. I understand.

Next, antiglare antireflection polarizing plates were prepared using the antiglare hard coat films of the present invention of Experimental Examples 1 and 2. When a liquid crystal display device in which an antireflection layer was disposed on the outermost layer using this polarizing plate was produced, 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 and had high definition compatibility.

[0054]

The antiglare hard coat film of the present invention is simple and inexpensive and has sufficient antireflection by forming at least one antiglare hard coat layer and a low refractive index layer on a transparent support. , Anti-glare, high definition,
It is used as an excellent antiglare film and antiglare antireflection film. The image of the image display device using the film having the above characteristics of the present invention has excellent contrast because there is no reflection of external light, and has excellent visibility because the reflection image is not conspicuous due to antiglare properties. And high-definition image quality.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a layer configuration of an antiglare hard coat film.

FIG. 2 is a histogram showing a distribution of distances between two different points obtained from the center coordinates of particles in a hard coat layer in an area of 1 × 10 ⁴ μm ² of Sample 1 of an experimental example.

FIG. 3 is a histogram showing a distribution of distances between two different points obtained from the center coordinates of particles in a hard coat layer in an area of 1 × 10 ⁴ μm ² of a sample 12 of an experimental example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transparent support 2 antiglare hard coat layer 3 low refractive index layer 4 particles

 ──────────────────────────────────────────────────の Continued on the front page F-term (reference) 2H042 BA02 BA03 BA12 BA15 BA20 2K009 AA04 AA12 AA15 BB28 CC09 CC23 CC24 CC26 DD02 DD05 4F100 AJ06A AK12B AK12H AK25B AR00B AR00C AT00A BA02 BA03 BA07 BA10B01B01B10BBAC DEB JN01A JN06 JN18C YY00B YY00C YY00H

Claims (4)

[Claims] 1. An anti-glare hard coat film having at least one anti-glare hard coat layer on a transparent support, wherein the anti-glare hard coat layer has an average particle size of 0.3 to 10.0.
An antiglare hard coat film containing particles of μm, wherein the average particle diameter d (μm) and the number n of particles per area A (μm ² ) on the film satisfy the following formula (1). Formula (1): A / 24 ≦ 3n (d / 2) ² ≦ A / 10 2. In the distribution of the distance between two different points determined from the center coordinates of particles having an average particle diameter of 0.3 to 10.0 μm in the antiglare hard coat layer in an area of 1 × 10 ⁴ μm ² , 0 The peak of the histogram in the 2 μm section is 30 to 8
The antiglare hard coat film according to claim 1, wherein the thickness is in a range of 0 µm. 3. An antiglare hard coat layer having a refractive index of 1.
3. A low refractive index layer having a refractive index of 38 to 1.49.
2. The antiglare hard coat film according to 1. 4. An image display device comprising the antiglare hard coat film according to claim 1 disposed on a display surface.