JP2001281411A - Glare proof antireflection film and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide a glare proof antireflection film having satisfactory antireflection performance, glare proof properties and high definition at low cost only by forming at least one glare proof hard coat layer and a low refractive index layer on a transparent base and to provide a polarizing plate and an image display device using the film. SOLUTION: The glare proof antireflection film has at least one glare proof hard coat layer (2) on a transparent base (1) and a low refractive index layer (3) having a refractive index of 1.38-1.49 on the glare proof hard coat layer. The film has 3.0-20.0% total haze, and the definition of a transmitted image measured with an image clarity measuring instrument using an optical comb of 0.5 mm width is 30-70%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antireflection 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 to prevent a decrease in contrast or reflection of an image due to reflection of external light on the outermost surface of the display. Placed in

On the other hand, in an image display device, it is desired to reduce the pixel size as much as possible to improve the display quality (high definition), and it is necessary to develop an antiglare antireflection film which sufficiently copes with this. The situation has come.

[0004]

An object of the present invention is 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 antireflection film having antiglare properties and high definition, a polarizing plate and an image display device using the same.

[0005]

The object of the present invention has been attained as follows. (1) At least one antiglare hard coat layer on a transparent support, and a refractive index of 1.3 on the antiglare hard coat layer.
An antiglare antireflection film having a low refractive index layer of 8 or more and 1.49 or less and having a total haze of 3.0% or more and 20.0% or less. 30% or more and 70% of the transmitted image sharpness value obtained by a colorimeter
An antiglare antireflection film characterized by the following. (2) The antiglare antireflection film according to (1), wherein the transparent support is triacetyl cellulose, polyethylene terephthalate, or polyethylene naphthalate. (3) The antiglare antireflection film according to (1) or (2), wherein the antiglare hard coat layer is crosslinked by ionizing radiation. (4) The antiglare hard coat layer according to any one of (1) to (3), wherein particles having an average particle size of 0.3 μm or more and 10.0 μm or less are contained. Anti-glare anti-reflection film. (5) The antiglare antireflection according to any one of (1) to (4), wherein the particles for the antiglare hard coat layer described in (4) are spherical organic polymer particles. the film. (6) The antiglare antireflection according to any one of (1) to (5), wherein the antiglare hard coat layer has a refractive index of 1.57 or more and 2.00 or less. the film. (7) The antiglare hard coat layer is selected from a monomer having two or more ethylenically unsaturated groups and titanium, aluminum, indium, zinc, tin, antimony, and zirconium having a particle size of 0.1 μm or less. The anti-glare anti-reflection film according to any one of the above items (1) to (6), comprising at least one oxide. (8) the low refractive index layer comprises a fluorine-containing compound which is crosslinked by heat or ionizing radiation, and inorganic fine particles;
450 nm to 650 nm of the antiglare antireflection film
The anti-glare anti-reflection film according to any one of (1) to (7), wherein the average reflectance of the film is 1.8% or less. (9) The protection according to any one of (1) to (8), wherein the average particle diameter of the inorganic fine particles contained in the low refractive index layer is 0.001 μm or more and 0.1 μm or less. Dazzling anti-reflection film. (10) The antiglare antireflection film according to any one of (1) to (9), wherein the inorganic fine particles contained in the low refractive index layer are silica. (11) The method according to any one of (1) to (10), wherein the fluorine-containing compound contained in the low refractive index layer is a polymer obtained by polymerizing a fluorine-containing vinyl monomer. Anti-glare anti-reflection film. (12) The antiglare antireflection film according to any one of (1) to (11) is used as at least one of two protective films of a polarizing layer in a polarizing plate. Polarizing plate. (13) The antiglare antireflection film according to any one of (1) to (11) or the antiglare antireflection polarizing plate according to (12) is used as an outermost layer of a display. Image display device.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic structure of the antiglare antireflection film of the present invention will be described with reference to the drawings. The embodiment shown in FIG. 1 is an example of the antiglare antireflection film of the present invention, and has a layer structure of a transparent support 1, an antiglare hard coat layer 2, and a low refractive index layer 3 in this order. 4 is a particle,
The material other than the particles of the antiglare hard coat layer preferably has a refractive index of 1.57 or more and 2.00, and the low refractive index layer has a refractive index of 1.38 or more and 1.49 or less. Although not shown,
Another one or more hard coat layers may be provided between the antiglare hard coat layer 2 and the transparent support 1. This additional hard coat layer may or may not normally contain particles. In the antireflection film, the low refractive index layer preferably satisfies the following formula (I).

Mλ / 4 × 0.7 <n ₁ d ₁ <mλ / 4 × 1.3 (I) where m is a positive odd number (generally 1), and n ₁ is the refraction of the low refractive index layer. And d ₁ is the thickness (nm) of the low refractive index layer. λ is the wavelength of light.

In the present invention, the refractive index of the hard coat layer containing particles is not described by a single value, but is a non-uniform refractive index layer in which particles are dispersed in a material forming the hard coat layer. The material forming the hard coat layer preferably has a refractive index of 1.57 or more and 2.00 or less. The high-refractive-index material is composed of a monomer having two or more ethylenically unsaturated groups and fine particles having a particle diameter of 100 nm or less composed of at least one oxide selected from titanium, aluminum, indium, zinc, tin, antimony, and zirconium. For example, Japanese Patent Application Laid-Open No. H8-110401 discloses that fine particles have a sufficiently small particle size smaller than the wavelength of light, so that scattering does not occur and the particles behave as optically uniform substances. Such a hard coat layer is preferable because internal scattering is caused by fine particles dispersed in the high refractive index material, so that there is no influence of optical interference in the hard coat layer.
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.

Preferably, a plastic film is used as the transparent support. Examples of the polymer forming the plastic film include cellulose esters (eg, triacetyl cellulose, diacetyl cellulose), polyamides, polycarbonates, polyesters (eg, polyethylene terephthalate, polyethylene naphthalate),
Examples include polystyrene and polyolefin. Of these, triacetyl cellulose, polyethylene terephthalate, and polyethylene naphthalate are preferred. When the antiglare antireflection film of the present invention is used for an image display device, for example, 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, triacetyl cellulose is used as a protective film for protecting the polarizing layer of the polarizing plate. Therefore, it is costly to use the antiglare antireflection film of the present invention as it is as the protective film. Is preferred.

The compound used for the 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 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 Conductor (eg, 1,4-divinylbenzene, 4-vinylbenzoic acid-2-acryloylethyl ester, 1,4-divinylcyclohexanone), vinylsulfone (eg, divinylsulfone), acrylamide (eg, methylenebisacrylamide) and methacryl Amides are 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.

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.

In order to increase the refractive index of the material forming the hard coat layer, the hard coat layer is made of particles made of at least one oxide selected from titanium, aluminum, indium, zinc, tin, antimony and zirconium. It is preferable to contain fine particles having a diameter of 100 nm or less, preferably 50 nm or less. Examples of fine particles include Ti
O ₂ , Al ₂ O ₃ , In ₂ O ₃ , ZnO, SnO ₂ , Sb
₂ O ₃ , ITO (indium titanium oxide), ZrO _{2, and the} like. The addition amount of the inorganic fine particles is preferably from 10 to 90% by mass, more preferably from 20 to 80% by mass, and particularly preferably from 30 to 60% by mass of the total mass of the hard coat layer.

In the hard coat layer, particles of an inorganic compound or an organic polymer are used for the purpose of imparting an antiglare property, preventing deterioration of the reflectance due to interference of the hard coat layer, and preventing color unevenness.
For example, silica particles, TiO ₂ particles, Al ₂ O ₃ particles, crosslinked acrylic particles, crosslinked styrene particles, melamine resin particles, benzoguanamine resin particles, crosslinked siloxane particles and the like are preferably used. Organic polymer from the standpoint of good dispersion stability (due to good affinity with the binder) and good sedimentation stability (due to low specific gravity) of the particles in the antiglare hard coat layer coating solution during production Particles are more preferred. The average particle size is preferably from 0.3 μm to 10.0 μm, more preferably from 0.5 μm to 5.0 μm, even more preferably from 1.0 μm to 3.0 μm. As the shape of the particles, any of a spherical shape and an irregular shape can be used, but a spherical shape is preferable in order to obtain a stable antiglare property.
Two or more different particles may be used in combination. Also,
It is preferable to use particles having a particle size larger than one third of the film thickness for the antiglare hard coat layer. The particle size distribution can be measured by a Coulter counter method, a centrifugal sedimentation method, or the like, and the distribution is converted into a particle number distribution. The thickness of the hard coat layer is preferably 2 μm or more and 10 μm, and 3 μm or more and 6 μm or more.
μm or less is more preferable.

For the low refractive index layer, a fluorine-containing compound and inorganic fine particles which have a dynamic friction coefficient of 0.03 or more and 0.15 or less and a contact angle with water of 90 ° or more and 120 ° or less and are crosslinked by heat or ionizing radiation are used. . Examples of the crosslinkable fluoropolymer compound used in the low refractive index layer include a fluorinated compound containing a perfluoroalkyl group (for example, (heptadecafluoro-1,1,2,2-tetradecyl) triethoxysilane) and the like. A fluorinated copolymer having a monomer and a monomer for providing 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, VISCOAT 6FM (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 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,
Ethyl acrylate, 2-ethylhexyl acrylate),
Methacrylates (methyl methacrylate, ethyl methacrylate, butyl methacrylate, ethylene glycol dimethacrylate, etc.), styrene derivatives (styrene,
Divinylbenzene, vinyltoluene, α-methylstyrene, etc.), vinyl ethers (methylvinyl ether, etc.), vinyl esters (vinyl acetate, vinyl propionate, vinyl cinnamate, etc.), acrylamides (N-te
rt butyl acrylamide, N-cyclohexyl acrylamide, etc.), methacrylamides, acrylonitrile derivatives and the like.

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 size of the inorganic fine particles is preferably from 0.001 μm to 0.2 μm, more preferably from 0.005 μm 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,
It is preferably from 5% by mass to 90% by mass, more preferably from 10% by mass to 70% by mass, more preferably from 20% by mass to 50% by mass, based on the total mass of the low refractive index layer. The inorganic fine particles are also 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, a silane coupling agent) is preferably used.
When the inorganic fine particles are silica, silane coupling treatment is particularly effective.

Each layer of the antiglare antireflection 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, a gravure coating method or an extrusion coating method (US Pat.
681294) can be formed by coating. Two or more layers may be applied simultaneously. For the method of simultaneous coating, see U.S. Pat.
No. 2941898, No. 3508947, No. 3526
No. 528, and Yuji Harazaki, Coating Engineering, page 253, Asakura Shoten (1973). The haze of the antiglare antireflection film is preferably from 5% to 18%, more preferably from 8% to 15%.

Next, the value of the transmitted image sharpness will be described. This value is obtained by using an image clarity measuring device (IC
(M-2D type). The sample measurement area was 50 mm × 50 mm, and the optical comb used had a width of 0.5 mm. Image clarity is a measure of how sharp and undistorted an image is when an object is projected on a painted surface. In particular, image clarity measured using an optical comb having a width of 0.5 mm ( This is called transmitted image sharpness.)
It has been found that the magnitude of the value is a good index as to whether or not it is possible to respond to high-definition monitoring. This measuring device and principle are based on JIS K7
105 (a method for testing the optical properties of plastics), and it has been decided to create an ISO technical report in ISO / TC79 / SC1. In this method, reflected light from a sample is measured through a moving optical comb, and the value is obtained by calculation. If the sample is blurred, the image of the slit formed on the optical comb becomes thick due to the blur, so that both ends of the slit image are applied to the opaque portion at the position of the transmission portion, and the amount of light is 100%. Decrease. Further, at the position of the opaque portion, light leaks from both ends of the slit image from the opaque portion, and the light amount of 0% increases. In this way, the value of the transmitted image sharpness by the image clarity measuring device is defined by the following equation from the maximum value M of the transmitted light of the transparent portion of the optical comb and the minimum value m of the opaque portion. Value of transmitted image sharpness C (%) = [(M−m) / (M +
m)] × 100 The larger the value of C, the higher the sharpness of the transmitted image, and the smaller the value, the more “blur” or “distortion”. (Coating technology, July 1985, image clarity measuring device, Suga / Mitamura) In the case of an anti-glare anti-reflection film compatible with a high-definition monitor, the value of transmitted image sharpness using an optical comb having a width of 0.5 mm Is preferably 30% or more and 70% or less, more preferably 35% or more and 60% or less. Adjusting the transmitted image clarity includes “thickness of antiglare hard coat layer”, “size of matte particles”, “frequency of matte particles (coating amount, content)”, “particle size”. It can be carried out by controlling the “dispersion degree”, “affinity of particles with binder” and the like.

A preferred combination of the haze and the value of the transmitted image sharpness (0.5 mm width optical comb) is 5% or more and 18% or less, and the value of the transmitted image sharpness is 30% or more and 70% or less. A more preferable combination is a haze of 8% or more and 15% or less, and a value of transmitted image sharpness of 35% or more and 60% or less. The antiglare antireflection film is applied to an image display device such as a liquid crystal display (LCD), 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.

[0021]

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

(Preparation of Coating Solution A for Hard Coat Layer) A mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (trade name: DP
HA, manufactured by Nippon Kayaku Co., Ltd.) (250 g), 439 g of methyl ethyl ketone / cyclohexanone = 50/50 mass%
Was dissolved in a mixed solvent of A photopolymerization initiator (trade name: Irgacure 907, manufactured by Ciba Geigy) is added to the obtained solution.
7.5 g and a photosensitizer (trade name: Kayacure DET)
X, manufactured by Nippon Kayaku Co., Ltd.) in a solution of 5.0 g in 49 g of methyl ethyl ketone. The refractive index of the coating film obtained by applying this solution and curing with ultraviolet light was 1.53. This solution was filtered through a polypropylene filter having a pore size of 3 μm to prepare a coating solution for the hard coat layer.

(Preparation of Coating Solution B for Antiglare Hard Coat Layer) A hard coat coating solution containing a titanium dioxide dispersion in a mixed solvent of 104.1 g of cyclohexanone and 61.3 g of methyl ethyl ketone (trade name: KZ) -7991, manufactured by JSR Corporation) 217.0 g,
Was added. The coating film obtained by applying this solution and curing with ultraviolet light had a refractive index of 1.70. Furthermore, crosslinked polystyrene particles having an average particle size of 2 μm (trade name: SX-
200H, manufactured by Soken Chemical Co., Ltd.), 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 3 μm to prepare a coating solution for the antiglare hard coat layer. . The addition amount of the crosslinked polystyrene particles is such that the dry film thickness of the antiglare hard coat layer is 1.4 μm. At this thickness, the value of the transmission image sharpness value of the antiglare antireflection film with respect to the addition amount of the crosslinked polystyrene particles is determined. A calibration curve was determined experimentally, and the value was adjusted using a 0.5 mm optical comb so that the value of the transmitted image sharpness determined by the image clarity measuring device was 40%.

(Preparation of Coating Liquid C for Antiglare Hard Coat Layer) A hard coat coating liquid containing a zirconium oxide dispersion (trade name: KZ) was stirred in a mixed solvent of 104.1 g of cyclohexanone and 61.3 g of methyl ethyl ketone with an air disper. -7115, manufactured by JSR Corporation) 217.0
g was added. The refractive index of the coating film obtained by applying this solution and curing with ultraviolet light was 1.61. Furthermore, crosslinked polystyrene particles having an average particle size of 2 μm (SX-20) were added to this solution.
0H, manufactured by Soken Chemical Co., Ltd.), and the mixture was stirred and dispersed at 5000 rpm for 1 hour with a high-speed disperser.
The solution was filtered through a μm polypropylene filter to prepare a coating solution for an antiglare hard coat layer. The addition amount of the crosslinked polystyrene particles is determined by setting the dry film thickness of the antiglare hard coat layer to 1.
At this thickness, the calibration curve of the value of the transmitted image sharpness of the antiglare antireflection film with respect to the added amount of the crosslinked polystyrene particles was experimentally determined, and the image clarity was measured using an optical comb of 0.5 mm. The value was adjusted so that the value of the transmitted image sharpness obtained by the instrument became 40%.

(Preparation of Coating Solution A for Low Refractive Index Layer) A thermally crosslinkable fluoropolymer having a refractive index of 1.40 (trade name: JN-
7228, solid content concentration 6% by mass, manufactured by JSR Corporation) 21
0 g of silica sol (trade name: MEK-ST, average particle size 1)
0-20 nm, solid content concentration 30% by mass, manufactured by Nissan Chemical Industries, Ltd.)
After adding 18 g and 245 g of methyl ethyl ketone and stirring, the mixture was filtered through a polypropylene filter having a pore size of 1 μm to prepare a coating solution for a low refractive index layer.

Example 1B Triacet having a thickness of 80 μm
Chil cellulose film (trade name: TAC-TD80)
U, manufactured by Fuji Photo Film Co., Ltd.)
Layer coating solution A using a bar coater,
After drying at ℃, 160W / cm air-cooled metal halide
Illuminance of 4
00mW / cm ^Two, Irradiation dose 300mJ / cm^TwoUV light
Irradiate to cure the coating layer, 4μm thick hard coat
A layer was formed. On top of that, for the anti-glare hard coat layer
Apply the coating solution B using a bar coater,
Drying and UV curing under the same conditions as the coating layer
An antiglare hard coat layer of 4 μm was formed. in addition,
Coating the above coating solution A for a low refractive index layer using a bar coater
After drying at 80 ° C, it was heated at 120 ° C for 10 minutes.
By bridging, a low refractive index layer having a thickness of 0.096 μm was formed. This
The value of the transmitted image sharpness of the sample is 40%. This sample
Is the support 1 and the antiglare hard coat layer in FIG.
2 and another hard coat formed with coating solution A
It corresponds to one having a layer.

[Example 2B] In Example 1B, an antiglare hard coat was applied so that the value of transmitted image clarity (using a 0.5 mm optical comb) of the antiglare reflective film was 35%. A sample prepared in exactly the same manner as the sample of Example 1B, except that the solid content concentration in the layer coating solution was not changed and the solid content concentration was reduced (the particle frequency was kept constant and the film thickness was reduced). Example 2B was a sample. [Example 3B] In Example 1B, the value of the transmitted image sharpness of the antiglare reflective film (using an optical comb of 0.5 mm)
The solid content concentration is reduced without changing the particle concentration in the coating solution for the antiglare hard coat layer so that the value becomes 30% (the particle frequency is kept constant and only the film thickness is reduced).
Except for this, a sample manufactured in exactly the same manner as the sample of Example 1B was used as a sample of Example 3B.

[Comparative Example 1B] In Example 1B, an antiglare hard coat was applied so that the value of the transmitted image sharpness value (using a 0.5 mm optical comb) of the antiglare reflective film was 25%. A sample prepared in exactly the same manner as the sample of Example 1B, except that the solid content concentration in the layer coating solution was not changed and the solid content concentration was reduced (the particle frequency was kept constant and the film thickness was reduced). This was a comparative example 1B sample. [Comparative Example 2B] The value of clearness of a transmitted image of an antiglare reflective film in Example 1B (using an optical comb of 0.5 mm)
The solid content concentration is reduced without changing the particle concentration in the coating solution for the antiglare hard coat layer so that the value becomes 15% (the particle frequency is kept constant and only the film thickness is reduced).
Except for this, a sample manufactured in exactly the same manner as the sample of Example 1B was used as a sample of Comparative Example 2B.

[Example 4B] In Example 1B, an antiglare hard coat was applied so that the value of the transmitted image sharpness value (using a 0.5 mm optical comb) of the antiglare reflective film became 50%. A sample prepared in exactly the same manner as the sample of Example 1B, except that the solid content other than that of the layer coating solution was not changed and the solid content was increased (the particle frequency was kept constant and the film thickness was increased). Example 4B was a sample. [Example 5B] In Example 1B, the value of the transmitted image sharpness of the antiglare reflective film (using an optical comb of 0.5 mm)
Is increased without changing the particle concentration in the coating solution for the antiglare hard coat layer so that the value of the solid content becomes 60% (the particle frequency is kept constant and only the film thickness is increased). Except for this, a sample manufactured in exactly the same manner as the sample of Example 1B was used as a sample of Example 5B.

Example 6B In Example 1B, an antiglare hard coat was applied so that the value of the transmitted image sharpness (using an optical comb of 0.5 mm) of the antiglare reflective film was 65%. A sample prepared in exactly the same manner as the sample of Example 1B, except that the solid content other than that of the layer coating solution was not changed and the solid content was increased (the particle frequency was kept constant and the film thickness was increased). Example 6B was a sample. [Example 7B] In Example 1B, the value of transmitted image clarity of the antiglare reflective film (using an optical comb of 0.5 mm)
The solid content concentration is increased without changing the particle concentration in the antiglare hard coat layer coating liquid so that the value becomes 70% (the particle frequency is kept constant and only the film thickness is increased). Except for this, a sample manufactured in exactly the same manner as the sample of Example 1B was used as a sample of Example 7B.

[Comparative Example 3B] In Example 1B, an antiglare hard coat was applied so that the value of the transmitted image clarity value (using an optical comb of 0.5 mm) of the antiglare reflective film was 75%. A sample prepared in exactly the same manner as the sample of Example 1B, except that the solid content other than that of the layer coating solution was not changed and the solid content was increased (the particle frequency was kept constant and the film thickness was increased). Comparative Example 3B was used as a sample. [Comparative Example 4B] The value of clearness of a transmitted image of an antiglare reflective film in Example 1B (using an optical comb of 0.5 mm)
The solid content concentration is increased without changing the particle concentration in the anti-glare hard coat layer coating liquid so that the value of is 80% (the particle frequency is kept constant and only the film thickness is increased). Except for this, a sample manufactured in exactly the same manner as the sample of Example 1B was used as a sample of Comparative Example 4B.

Example 1C The procedure of Example 1B was repeated, except that the coating solution C for the antiglare hard coat layer was used in place of the coating solution B for the antiglare hard coat layer. The fabricated sample was used as a sample of Example 1C. [Examples 2C to 7C, Comparative Examples 1C to 4C] In the same manner as in Example 1B, the sample was replaced with the sample of Example 1C.
The coating liquid C for the antiglare hard coat layer was used in place of the coating liquid B for the antiglare hard coat layer. In this case, the solid concentration of the matting agent in the coating liquid was not changed, and the other solid contents were not changed. Were increased or decreased, and the samples adjusted to the desired value of the transmitted image sharpness were referred to as Examples 2C to 7C and Comparative Examples 1C to 4C, respectively.

(Evaluation of anti-glare anti-reflection film) The anti-glare anti-reflection film thus produced was evaluated for the following items. (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.). (2) Evaluation of Value of Transmission Image Sharpness For the produced antiglare antireflection film, using an image quality measuring device (ICM-2D type) manufactured by Suga Test Instruments Co., Ltd.,
The value of the transmitted image sharpness was measured with an optical comb of 0.5 mm. It has been found that the value of the transmitted image clarity is an important index when developing an antiglare antireflection film corresponding to a high definition monitor. The higher the value, the higher the definition.

(3) Evaluation of Antiglare Property A bare fluorescent lamp (8000 cd / cm ² ) without a louver was projected on the produced antiglare antireflection film, and the degree of blurring of the reflected image was evaluated according to the following criteria. The outline of the fluorescent lamp is almost completely unclear: ◎ The outline of the fluorescent lamp is slightly recognized: ○ The fluorescent lamp is blurred, but the outline is identifiable: 灯 The fluorescent lamp is hardly blurred: ×

(4) Evaluation of suitability for high-definition monitor In order to evaluate the suitability of the antiglare antireflection film for high-definition monitor, it was prepared so as to be in close contact with a PC-PJ2-X4 monitor manufactured by Sharp Corporation. The anti-glare anti-reflection film was mounted, and evaluated visually and sensuously according to the following criteria. here,
A monitor in which the size of one pixel is about 200 μm × 200 μm or less when three pixels of R, G, and B are integrated into one pixel is referred to as a high definition monitor. The “glare” in the present invention is not due to the presence or absence of glare in the reflection of lighting such as electric lights, which is discussed in terms of anti-glare properties, but to the R, G , Say that B looks glaring. Glitter is hardly noticeable at all: ◎ Slight glare is observed: ○ Slight glare is present: △ Glitter is clearly recognizable: ×

(5) Average Reflectance The produced antiglare antireflection film was subjected to spectral reflection at an incident angle of 5 ° in a wavelength range of 380 to 780 nm using a spectrophotometer (manufactured by JASCO Corporation). The rate was measured. The average reflectance of 450 to 650 nm was used for the results.

Table 1 shows the results of Examples and Comparative Examples.
It can be seen that Examples 1B to 7B are all antiglare antireflection films that can be used for high-definition monitors.
It is necessary to set the value of the clearness of the transmitted image by the image clarity measuring device between 30% and 70% using an optical comb of 0.5 mm in order to achieve both the antiglare property and the high definition. .
The comparative example samples 1B to 4B deviating from this range cannot achieve both the antiglare property and the high definition. Exactly the same results were obtained in Examples 1C to 7C and Comparative Examples 1C to 4C.

[0038]

[Table 1]

Next, anti-glare anti-reflection polarizing plates were prepared using the anti-glare anti-reflection films of Examples 1B to 7B and 1C to 7C. 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.

[0040]

The antiglare antireflection film of the present invention can be obtained simply by forming at least one antiglare hard coat layer and a low refractive index layer on a transparent support. Has anti-reflective properties, anti-glare properties, and high definition. A polarizing plate and an image display device using this are excellent in all of antireflection properties, antiglare properties, and high definition.

[Brief description of the drawings]

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

[Explanation of symbols]

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

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B32B 27/36 C09K 3/00 U C09K 3/00 G02B 5/30 G02B 1/10 G02F 1/1335 500 5/30 H04N 5/72 A G02F 1/1335 500 G02B 1/10 A H04N 5/72 Z (72) Inventor Hidetoshi Watanabe 210 Nakanakanuma, Minamiashigara-shi, Kanagawa Prefecture Fuji Photo Film Co., Ltd. F-term (reference) 2H049 BA02 BB33 BC22 2H091 FA37X FB02 FB06 FC16 FC23 FC27 FC29 FC30 FD06 GA16 GA17 KA01 LA03 LA11 LA12 2K009 AA04 AA12 AA15 BB24 BB28 CC03 CC09 CC26 DD02 DD05 4F100 AA01C AA19B AA20C AA21B AA25B AA27B AA05B AA29B AA12B AA12A DE01B DE01C GB41 JB13C JB14B JB14C JB20B JB20C JK12B JN01A JN02 JN06 JN10 JN18B JN18C JN30 JN30B YY00 YY00B YY00C 5C058 AA01 AA05 AA11 AB05 BA35 DA01 DA02 DA03

Claims (13)

[Claims] 1. A transparent support comprising at least one antiglare hard coat layer and a low refractive index layer having a refractive index of 1.38 or more and 1.49 or less on the antiglare hard coat layer. An anti-glare anti-reflection film having a total haze of 3.0% or more and 20.0% or less, wherein a value of a transmitted image sharpness determined by an image-definition measuring device using an optical comb having a width of 0.5 mm is 30. % Or more and 70% or less. 2. The antiglare antireflection film according to claim 1, wherein said transparent support is triacetyl cellulose, polyethylene terephthalate or polyethylene naphthalate. 3. The antiglare antireflection film according to claim 1, wherein the antiglare hard coat layer is crosslinked by ionizing radiation. 4. An antiglare hard coat layer having an average particle size of 0.1.
The anti-glare anti-reflection film according to any one of claims 1 to 3, wherein the anti-glare anti-reflection film according to any one of claims 1 to 3, wherein particles having a size of 3 µm or more and 10.0 µm or less are contained. 5. The anti-glare anti-reflection film according to claim 1, wherein the particles of the anti-glare hard coat layer according to claim 4 are spherical organic polymer particles. 6. The antiglare hard coat layer having a refractive index of 1.
2. The structure according to claim 1, wherein the ratio is from 57 to 2.00.
6. The anti-glare anti-reflection film according to any one of claims 1 to 5. 7. The antiglare hard coat layer comprises a monomer having two or more ethylenically unsaturated groups and a particle size of 0.1 μm.
The following titanium, aluminum, indium, zinc, tin,
Antimony, containing at least one oxide selected from zirconium.
7. The antiglare antireflection film according to any one of 6. 8. The antireflection antireflection film according to claim 8, wherein the low refractive index layer comprises a fluorine-containing compound which is crosslinked by heat or ionizing radiation, and inorganic fine particles.
The antiglare antireflection film according to any one of claims 1 to 7, wherein the average reflectance at 50 nm is 1.8% or less. 9. The antiglare according to claim 1, wherein the average particle diameter of the inorganic fine particles contained in the low refractive index layer is from 0.001 μm to 0.1 μm. Anti-reflective film. 10. The antiglare antireflection film according to claim 1, wherein the inorganic fine particles contained in the low refractive index layer are silica. 11. The protection according to claim 1, wherein the fluorine-containing compound contained in the low refractive index layer is a polymer obtained by polymerizing a fluorine-containing vinyl monomer. Dazzling anti-reflection film. 12. The anti-glare anti-reflection film according to claim 1, wherein the anti-glare anti-reflection film is used as at least one of two protective films of a polarizing layer in a polarizing plate. Polarizer. 13. An antiglare antireflection film according to any one of claims 1 to 11 or an antiglare antireflection polarizing plate according to claim 12 used as the outermost layer of a display. Image display device.