JP2009288650A - Antiglare hard coat film, polarizing plate and image display apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antiglare hard coat film which has an excellent antiglare property, responds with high definition while having a low haze value, prevents white blurring from an inclined direction and improves depth of black color in displaying black and to provide a polarizing plate and an image display apparatus using the antiglare hard coat film. <P>SOLUTION: The antiglare hard coat film includes an antiglare hard coat layer containing particulates on at least one surface of a transparent plastic film base material. Thickness of the antiglare hard coat layer is 15 μm or less. In an irregularity form of an antiglare hard coat layer surface, a ratio of tilt angles of ≤0.5° absolute value when tilt angle distribution is measured is 60% or less and a ratio of tilt angles of ≥5° absolute value is 3% or less. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an antiglare hard coat film, a polarizing plate using the same, and an image display device.

  Along with recent technological advances, liquid crystal display devices (LCD), plasma displays (PDP), electroluminescence displays (ELD), etc. have been developed and put to practical use in addition to conventional cathode ray tube display devices (CRT). It has become. Among these, LCDs are changing from notebook personal computers and monitors to televisions due to technological innovations such as high viewing angles, high definition, high speed response, and color reproducibility. . In general, a liquid crystal panel in which polarizing plates are arranged on both sides of a liquid crystal cell is used for the LCD. The surface of the liquid crystal panel is generally subjected to a hard coat treatment to prevent the polarizing plate from being scratched. For the hard coat treatment, a hard coat film is often used. The hard coat film is subjected to an anti-glare treatment for preventing a decrease in contrast due to reflection of external light such as fluorescent light or sunlight on the liquid crystal panel surface or reflection of an image, and in particular, image display. As the screen size of the apparatus has increased, image display apparatuses equipped with an antiglare hard coat film have been increasing.

  In recent years, high-definition image display devices with small pixel sizes are increasing in order to improve image quality. When a conventional anti-glare hard coat film is arranged on such a high-definition image display device, the luminance variation existing in the pixels is more emphasized, causing a visible failure (glare failure), and the image quality is remarkably improved. It was getting worse. Conventionally, in order to produce a high-definition anti-glare laminate, there has been a method of eliminating glare by increasing the haze value of the anti-glare layer. Due to the strong scattering, there is a problem that the contrast is greatly reduced. Further, when the haze value is increased, there is a problem of so-called white blurring in the oblique direction, in which when viewed from an oblique direction, scattering of reflected light becomes too strong and the image appears blurred. In the anti-glare treatment, a method of producing an uneven shape on the film surface by adding inorganic or organic particles is performed. The improvement in anti-glare property, the improvement in contrast, and the improvement in white blur are generally considered to be in a reciprocal relationship, but various proposals have been made to achieve both of these characteristics. For example, studies have been made to make a three-dimensional three-dimensional structure agglomerate formed from the particles in the antiglare layer (see, for example, Patent Document 1). A fine pattern may appear on the coated film. Although effective means for improving some characteristics have been proposed (see, for example, Patent Documents 2 and 3), no effective means for solving all the above three problems has been found.

JP 2005-316413 A JP 2003-4903 A Japanese Patent No. 4001320

  SUMMARY OF THE INVENTION An object of the present invention is to provide an antiglare hard coat film that improves visibility without degrading the characteristics of an image display device such as an LCD that is becoming increasingly fine and high in contrast. In other words, it has excellent anti-glare properties and can cope with high definition with a low haze value, and can prevent white blurring from an oblique direction and improve black density during black display. An object is to provide a dazzling hard coat film, a polarizing plate using the same, and an image display device.

  To achieve the above object, the antiglare hard coat film of the present invention is an antiglare hard coat film having an antiglare hard coat layer containing fine particles on at least one surface of a transparent plastic film substrate. The thickness of the antiglare hard coat layer is 15 μm or less, and in the uneven shape on the surface of the antiglare hard coat layer, the absolute value of the tilt angle when measuring the tilt angle distribution is 0.5 °. The following ratio is 60% or less, and the ratio of the absolute value of the inclination angle of 5 ° or more is 3% or less.

  The polarizing plate of the present invention is a polarizing plate having a polarizer and an antiglare hard coat film, wherein the antiglare hard coat film is the antiglare hard coat film of the present invention. .

  The image display device of the present invention is an image display device including an antiglare hard coat film or a polarizing plate, wherein the hard coat film is the antiglare hard coat film of the present invention, and the polarizing plate is the book. It is a polarizing plate of the invention.

  According to the anti-glare hard coat film of the present invention, for example, even in a high-definition liquid crystal panel having a resolution of about 130 ppi, glare is suppressed, and further, with the realization of a low haze value, Compared with a high-definition antiglare hard coat film, the contrast of light and darkness can be greatly improved. The antiglare hard coat film of the present invention has excellent antiglare properties by realizing a characteristic uneven shape, and can prevent white blurring from an oblique direction. By preventing the white blurring, light scattering in the front direction of the image display device can be suppressed, so that the black luminance can be suppressed and the contrast in a bright place can be improved. Thereby, it is possible to improve the darkness of black when the image display device displays black. Therefore, the image display apparatus using the antiglare hard coat film or polarizing plate of the present invention has excellent display characteristics.

  In the anti-glare hard coat film of the present invention, in a bright place contrast measurement measured by mounting on a panel, the contrast with respect to incident light having an incident angle of 15 ° or less is 30 or less, and the incident angle is 45 ° or more. It is preferable that the contrast with respect to light is 85 or more.

In the antiglare hard coat film of the present invention, the antiglare hard coat layer is formed using the fine particles and a hard coat layer forming material containing the following components (A) and (B). It is preferable.
(A) component: a curable compound having at least one of an acrylate group and a methacrylate group (B) component: particles formed by bonding inorganic oxide particles and an organic compound containing a polymerizable unsaturated group

  In the antiglare hard coat film of the present invention, the weight average particle size of the component (B) is preferably 200 nm or less.

  In the component (B), the inorganic oxide particles preferably include at least one particle selected from the group consisting of silicon oxide, titanium oxide, aluminum oxide, zinc oxide, tin oxide and zirconium oxide.

  In the hard coat layer forming material, the component (B) is preferably contained in the range of 100 to 200 parts by weight with respect to 100 parts by weight of the component (A).

  A spherical or irregular shape in which the difference in refractive index between the hard coat layer forming material and the fine particles is in the range of 0.01 to 0.04, and the fine particles have a weight average particle size in the range of 0.5 to 8 μm. It is preferable that the fine particles are contained in an amount of 3 to 10 parts by weight with respect to 100 parts by weight of the hard coat layer forming material.

  In the antiglare hard coat film of the present invention, the thickness of the antiglare hard coat layer is preferably in the range of 1.2 to 3 times the weight average particle diameter of the fine particles.

  In the antiglare hard coat film of the present invention, an antireflection layer is preferably formed on the antiglare hard coat layer.

  Next, the present invention will be described in detail. However, the present invention is not limited by the following description.

  The antiglare hard coat film of the present invention has an antiglare hard coat layer on at least one surface of a transparent plastic film substrate.

  The transparent plastic film substrate is not particularly limited, but preferably has a visible light transmittance (preferably a light transmittance of 90% or more) and a transparency (preferably a haze value of 1% or less). . Examples of the material for forming the transparent plastic film substrate include polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as diacetyl cellulose and triacetyl cellulose, acrylic polymers such as polycarbonate polymers and polymethyl methacrylate. Etc. Examples of the material for forming the transparent plastic film substrate include styrene polymers such as polystyrene and acrylonitrile-styrene copolymers, polyethylene, polypropylene, polyolefins having a cyclic or norbornene structure, and ethylene-propylene copolymers. Examples thereof include olefin polymers, vinyl chloride polymers, amide polymers such as nylon and aromatic polyamide. Furthermore, examples of the material for forming the transparent plastic film substrate include imide polymers, sulfone polymers, polyether sulfone polymers, polyether ether ketone polymers, polyphenylene sulfide polymers, vinyl alcohol polymers, and vinylidene chloride. Examples thereof include polymers, vinyl butyral polymers, arylate polymers, polyoxymethylene polymers, epoxy polymers and blends of the aforementioned polymers. Among these, those having a small optical birefringence are preferably used. The antiglare hard coat film of the present invention can also be used for a polarizing plate as a protective film, for example. In this case, as the transparent plastic film substrate, triacetyl cellulose (TAC), polycarbonate, acrylic A film formed from a polymer, a polyolefin having a cyclic or norbornene structure, or the like is preferable. In the present invention, as described later, the transparent plastic film substrate may be a polarizer itself. With such a configuration, a protective layer made of TAC or the like is not required, and the structure of the polarizing plate can be simplified. Therefore, the number of manufacturing steps of the polarizing plate or the image display device can be reduced, and the production efficiency can be improved. Moreover, if it is such a structure, a polarizing plate can be made thinner. When the transparent plastic film substrate is a polarizer, the antiglare hard coat layer serves as a conventional protective layer. Moreover, if it is such a structure, an anti-glare hard-coat film will serve as the function as a cover plate with which the liquid crystal cell surface is mounted | worn.

  In the present invention, the thickness of the transparent plastic film substrate is not particularly limited, but is preferably in the range of 10 to 500 μm, more preferably in consideration of workability such as strength and handleability and thin layer properties. Is in the range of 20-300 μm, optimally in the range of 30-200 μm. The refractive index of the transparent plastic film substrate is not particularly limited. The refractive index is, for example, in the range of 1.30 to 1.80, and preferably in the range of 1.40 to 1.70.

  The antiglare hard coat layer is formed using the fine particles and the hard coat layer forming material. As described above, examples of the hard coat layer forming material include a thermosetting resin and an ionizing radiation curable resin that is cured by ultraviolet rays or light. As the hard coat layer forming material, a commercially available thermosetting resin, ultraviolet curable resin, or the like can be used. Examples of the hard coat layer forming material include the following components (A) and (B): The thing containing is preferable.

(A) component: a curable compound having at least one of an acrylate group and a methacrylate group (B) component: particles formed by bonding inorganic oxide particles and an organic compound containing a polymerizable unsaturated group

  As said (A) component, the curable compound which has at least one group of the acrylate group and methacrylate group which harden | cure with a heat | fever, light (ultraviolet rays etc.) or an electron beam etc. can be used, for example. Examples of the component (A) include acrylates of polyfunctional compounds such as silicone resins, polyester resins, polyether resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and polyhydric alcohols. And oligomers or prepolymers such as styrene and methacrylate. These may be used alone or in combination of two or more.

  As said (A) component, the reactive diluent which has at least one group of an acrylate group and a methacrylate group can also be used, for example. Examples of the reactive diluent include monofunctional acrylate, monofunctional methacrylate, polyfunctional acrylate, and polyfunctional methacrylate. Examples of the monofunctional acrylate include ethylene oxide modified phenol acrylate, propylene oxide modified phenol acrylate, ethylene oxide modified nonylphenol acrylate, propylene oxide modified nonylphenol acrylate, 2-ethylhexyl carbitol acrylate, isobornyl acrylate, Tetrahydrofurfuryl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyhexyl acrylate, diethylene glycol monoacrylate, triethylene glycol monoacrylate, tripropylene glycol monoacrylate and the like are included. Examples of the monofunctional methacrylate include methacrylate of ethylene oxide modified phenol, methacrylate of propylene oxide modified phenol, methacrylate of ethylene oxide modified nonyl phenol, methacrylate of propylene oxide modified nonyl phenol, 2-ethylhexyl carbitol methacrylate, isobornyl methacrylate, Tetrahydrofurfuryl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, hydroxyhexyl methacrylate, diethylene glycol monomethacrylate, triethylene glycol monomethacrylate, tripropylene glycol monomethacrylate and the like are included. Examples of the polyfunctional acrylate include diethylene glycol diacrylate, triethylene glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, tetrapropylene glycol diacrylate, polypropylene glycol diacrylate, 1,4-butanediol diacrylate, Neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, ethylene oxide modified neopentyl glycol diacrylate, ethylene oxide modified bisphenol A diacrylate, propylene oxide modified bisphenol A diacrylate, ethylene oxide modified hydrogenated bisphenol A Diacrylate, trimethylolpropane diacrylate, trimethyl Propane allyl ether diacrylate, trimethylolpropane triacrylate, ethylene oxide modified trimethylolpropane triacrylate, propylene oxide modified trimethylolpropane triacrylate, pentaerythritol tetraacrylate, dipentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, etc. Including. Examples of the polyfunctional methacrylate include diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, dipropylene glycol dimethacrylate, tripropylene glycol dimethacrylate, tetrapropylene glycol dimethacrylate, polypropylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, Neopentyl glycol dimethacrylate, 1,6-hexanediol dimethacrylate, ethylene oxide modified neopentyl glycol dimethacrylate, ethylene oxide modified bisphenol A dimethacrylate, propylene oxide modified bisphenol A dimethacrylate, ethylene oxide modified hydrogenated bisphenol A Dimethacrylate, trimethylol pro Dimethacrylate, trimethylolpropane allyl ether dimethacrylate, trimethylolpropane trimethacrylate, ethylene oxide modified trimethylolpropane trimethacrylate, propylene oxide modified trimethylolpropane trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol tetramethacrylate, dipentaerythritol hexa Including methacrylate. The reactive diluent is preferably a trifunctional or higher acrylate or a trifunctional or higher methacrylate. This is because the hardness of the antiglare hard coat layer can be made more excellent. Examples of the component (A) include butanediol glycerin ether diacrylate, isocyanuric acid acrylate, isocyanuric acid methacrylate, and the like. As the component (A), one type may be used alone, or two or more types may be used in combination.

  The component (B) is as described above. In the component (B), examples of the inorganic oxide particles include fine particles such as silicon oxide (silica), titanium oxide, aluminum oxide, zinc oxide, tin oxide, and zirconium oxide. Among these, fine particles of silicon oxide (silica), titanium oxide, aluminum oxide, zinc oxide, tin oxide, and zirconium oxide are preferable. These may be used alone or in combination of two or more.

  In the antiglare hard coat film of the present invention, the component (B) has a weight average particle diameter of 1 nm to 200 nm from the viewpoints of preventing light scattering, preventing the hard coat layer from lowering transmittance, preventing coloring, and transparency. It is preferable that it is what is called a nanoparticle which is the range of these. The said weight average particle diameter can be measured by the method as described in the below-mentioned Example, for example. The weight average particle diameter is more preferably in the range of 1 nm to 100 nm. The inventors have found that when the component (B), which is a nanoparticle, is added to the component (A), the movement of the fine particles in the coating and drying process changes due to, for example, selection of a solvent described later. It was. That is, in a system to which nanoparticles were added, there was a tendency that surface irregularities due to the fine particles were hardly formed when a specific solvent was used, and that the irregularities were easily formed when another specific solvent was used. If the nanoparticles were not contained, the difference in surface irregularities depending on the type of solvent was not large. From these phenomena, when the nanoparticles are contained, repulsive force acts on the nanoparticles and the fine particles, so that the fine particles are easily dispersed relatively uniformly, and the movement of the fine particles in the coating and drying process is controlled. Therefore, it can be presumed that the number of added parts of the fine particles can be reduced, and the surface uneven shape of the present invention can be effectively produced. However, the present invention is not limited or limited by this inference.

  In the component (B), the inorganic oxide particles are bonded (surface modified) with an organic compound containing a polymerizable unsaturated group. The polymerizable unsaturated group is reactively cured with the component (A), thereby improving the hardness of the hard coat layer. As the polymerizable unsaturated group, for example, acryloyl group, methacryloyl group, vinyl group, propenyl group, butadienyl group, styryl group, ethynyl group, cinnamoyl group, maleate group, and acrylamide group are preferable. The organic compound containing a polymerizable unsaturated group is preferably a compound having a silanol group in the molecule or a compound that generates a silanol group by hydrolysis. It is also preferable that the organic compound containing a polymerizable unsaturated group has a photosensitive group.

  The blending amount of the component (B) is preferably in the range of 100 to 200 parts by weight with respect to 100 parts by weight of the component (A). By making the blending amount of the component (B) 100 parts by weight or more, curling and folding of the antiglare hard coat film can be more effectively prevented, and by making it 200 parts by weight or less, scratch resistance is obtained. Property and pencil hardness can be made high. The blending amount of the component (B) is more preferably in the range of 100 to 150 parts by weight with respect to 100 parts by weight of the component (A).

  By adjusting the blending amount of the component (B), for example, the refractive index of the antiglare hard coat layer can be adjusted. When the antireflection layer described later is not provided, the refractive index of the antiglare hard coat layer is preferably lowered in order to suppress the reflectance. In the case of providing an antireflection layer (low refractive index layer), it is possible to uniformly reduce reflection in the wavelength region of visible light by increasing the refractive index of the antiglare hard coat layer.

  The hard coat layer forming material preferably includes, for example, the following component (D), component (E) and component (F).

(D) Component: At least one of urethane acrylate and urethane methacrylate (E) Component: At least one of polyol acrylate and polyol methacrylate (F) Component: Polymer or copolymer formed from at least one of the following (F1) and (F2) Or mixed polymer (F1) of the above-mentioned polymer and copolymer: alkyl acrylate (F2) having an alkyl group having at least one group of hydroxyl group and acryloyl group: alkyl methacrylate having an alkyl group having at least one group of hydroxyl group and acryloyl group

  As said urethane acrylate and urethane methacrylate which are said (D) component, what contains acrylic acid, methacrylic acid, acrylic ester, methacrylic ester, a polyol, and diisocyanate as a structural component is used. For example, by using at least one monomer of acrylic acid, methacrylic acid, acrylic acid ester and methacrylic acid ester and a polyol, at least one of hydroxy acrylate having one or more hydroxyl groups and hydroxy methacrylate having one or more hydroxyl groups is produced. Then, at least one of urethane acrylate and urethane methacrylate can be produced by reacting this with diisocyanate. In the component (D), urethane acrylate and urethane methacrylate may be used alone or in combination of two or more.

  Examples of acrylic esters include alkyl acrylates such as methyl acrylate, ethyl acrylate, isopropyl acrylate, and butyl acrylate; cycloalkyl acrylates such as cyclohexyl acrylate, and the like. Examples of the methacrylic acid ester include alkyl methacrylates such as methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, and butyl methacrylate; cycloalkyl methacrylates such as cyclohexyl methacrylate.

  The polyol is a compound having at least two hydroxyl groups, such as ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, 1,9-nonanediol, 1,10-decanediol, 2,2,4-trimethyl-1,3-pentanediol, 3-methyl-1,5 -Pentanediol, hydroxypivalic acid neopentyl glycol ester, tricyclodecane dimethylol, 1,4-cyclohexanediol, spiroglycol, tricyclodecane dimethylol, hydrogenated bisphenol A, ethylene oxide-added bisphenol A, propylene glycol Side addition bisphenol A, trimethylolethane, trimethylolpropane, glycerin, 3-methylpentane-1,3,5-triol, pentaerythritol, dipentaerythritol, tripentaerythritol, glucose and the like can be mentioned.

  As said diisocyanate, various aromatic, aliphatic, or alicyclic diisocyanates can be used, for example, tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2,4-tolylene diisocyanate, 4 , 4-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, 3,3-dimethyl-4,4-diphenyl diisocyanate, xylene diisocyanate, trimethylhexamethylene diisocyanate, 4,4-diphenylmethane diisocyanate, and hydrogenated products thereof Can be given.

  The blending ratio of the component (D) is not particularly limited. By using the component (D), the flexibility of the formed antiglare hard coat layer and the adhesion to the transparent plastic film substrate can be improved. From the viewpoint of these points and the hardness of the antiglare hard coat layer, the blending ratio of the component (D) is, for example, in the range of 15 to 55% by weight with respect to the entire resin component in the hard coat layer forming material. Preferably, it is the range of 25 to 45 weight%. The whole resin component is the total amount of the (D) component, the (E) component and the (F) component, or, when other resin components are used, the total amount of the three components and the total amount of the resin component The same applies hereinafter.

  Examples of the component (E) include pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, 1,6-hexanediol acrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, penta Examples include erythritol tetramethacrylate, dipentaerythritol hexamethacrylate, and 1,6-hexanediol methacrylate. These may be used alone or in combination of two or more. For example, the polyol acrylate is preferably a monomer component made of a polymer of pentaerythritol triacrylate and pentaerythritol tetraacrylate and a mixed component containing pentaerythritol triacrylate and pentaerythritol tetraacrylate.

  The blending ratio of the component (E) is not particularly limited. For example, the blending ratio of the component (E) is preferably in the range of 70 to 180% by weight, more preferably in the range of 100 to 150% by weight with respect to the component (D). When the blending ratio of the component (E) is 180% by weight or less with respect to the component (E), curing shrinkage of the formed antiglare hard coat layer can be effectively prevented, and as a result, the antiglare hard coat is obtained. Curling of the film can be prevented, and a decrease in flexibility can be prevented. Moreover, if the blending ratio of the component (E) is 70% by weight or more of the component (D), the hardness of the antiglare hard coat layer to be formed can be further improved, and the scratch resistance is improved. It becomes possible.

  In the component (F), the alkyl group of (F1) and (F2) is not particularly limited, and is, for example, an alkyl group having 1 to 10 carbon atoms, which may be linear or branched. There may be. Examples of the component (F) include a polymer, a copolymer or a mixture of the polymer and the copolymer containing a repeating unit of the following general formula (1).

前記式（１）において、Ｒ^１は、−Ｈ若しくは‐ＣＨ_３であり、Ｒ^２は、−ＣＨ_２ＣＨ_２ＯＸ若しくは下記一般式（２）で表される基であり、前記Ｘは、−Ｈ若しくは下記一般式（３）で表されるアクリロイル基である。

In the formula (1), R ¹ is —H or —CH ₃ , R ² is —CH ₂ CH ₂ OX or a group represented by the following general formula (2), and the X is — H or an acryloyl group represented by the following general formula (3).

前記一般式（２）において、前記Ｘは、−Ｈ若しくは下記一般式（３）で表されるアクリロイル基であり、前記Ｘは、同一であってもよいし、異なっていてもよい。

In the general formula (2), X is —H or an acryloyl group represented by the following general formula (3), and the Xs may be the same or different.

  Examples of the component (F) include 2,3-dihydroxypropyl acrylate, 2,3-diacryloyloxypropyl acrylate, 2-hydroxy-3-acryloyloxypropyl acrylate, 2-acryloyloxy-3-hydroxypropyl acrylate, 2,3-dihydroxypropyl methacrylate, 2,3-diacryloyloxypropyl methacrylate, 2-hydroxy-3-acryloyloxypropyl methacrylate, 2-acryloyloxy-3-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-acryloyloxy At least one monomer selected from the group consisting of ethyl acrylate, 2-hydroxyethyl methacrylate and 2-acryloyloxy methacrylate; Formed polymer, a mixture of copolymer or the polymer and the copolymer can be mentioned.

  The blending ratio of the component (F) is not particularly limited. For example, the blending ratio of the component (F) is preferably in the range of 25 to 110% by weight, more preferably in the range of 45 to 85% by weight with respect to the component (D). When the blending ratio of the component (F) is 110% by weight or less, the coating property of the antiglare hard coat layer forming material becomes excellent, and the blending ratio of the component (F) is 25% by weight or more. Thus, curing shrinkage of the formed antiglare hard coat layer can be prevented, and as a result, curling can be prevented in the antiglare hard coat film.

  The fine particles for forming the antiglare hard coat layer provide the antiglare property by making the surface of the formed antiglare hard coat layer uneven, and also the haze value of the antiglare hard coat layer. The main function is to control. The haze value of the antiglare hard coat layer can be designed by controlling the refractive index difference between the fine particles and the hard coat layer forming material. Examples of the fine particles include inorganic fine particles and organic fine particles. The inorganic fine particles are not particularly limited, and examples thereof include silicon oxide fine particles, titanium oxide fine particles, aluminum oxide fine particles, zinc oxide fine particles, tin oxide fine particles, calcium carbonate fine particles, barium sulfate fine particles, talc fine particles, kaolin fine particles, calcium sulfate fine particles and the like. Can be given. The organic fine particles are not particularly limited. For example, polymethyl methacrylate resin powder (PMMA fine particles), silicone resin powder, polystyrene resin powder, polycarbonate resin powder, acrylic styrene resin powder, benzoguanamine resin powder, melamine resin powder, polyolefin resin Examples thereof include powder, polyester resin powder, polyamide resin powder, polyimide resin powder, and polyfluorinated ethylene resin powder. These inorganic fine particles and organic fine particles may be used alone or in combination of two or more.

  The weight average particle diameter of the fine particles is preferably in the range of 0.5 to 8 μm. When the weight average particle diameter of the fine particles is larger than the above range, image sharpness is deteriorated. When the fine particle diameter is smaller than the above range, sufficient antiglare property cannot be obtained, and the problem that glare is likely to increase is likely to occur. The weight average particle diameter of the fine particles is more preferably in the range of 2 to 6 μm, still more preferably in the range of 3 to 6 μm. The weight average particle diameter of the fine particles is preferably in the range of 30 to 80% of the thickness of the antiglare hard coat layer. The weight average particle diameter of the fine particles can be measured by, for example, a Coulter counting method. For example, by using a particle size distribution measuring device (trade name: Coulter Multisizer, manufactured by Beckman Coulter, Inc.) using a pore electrical resistance method, the electrolyte solution corresponding to the volume of the particulates when the particulates pass through the pores By measuring the electrical resistance, the number and volume of the fine particles are measured, and the weight average particle diameter is calculated.

  The shape of the fine particles is not particularly limited, and may be, for example, a bead-like substantially spherical shape or an irregular shape such as a powder, but is preferably substantially spherical, more preferably an aspect ratio. Is substantially spherical fine particles having a particle size of 1.5 or less, and most preferably spherical fine particles.

  The blending ratio of the fine particles is preferably in the range of 3 to 20 parts by weight, more preferably in the range of 5 to 15 parts by weight with respect to 100 parts by weight of the hard coat layer forming material.

  The antiglare hard coat layer has a thickness of 15 μm or less, preferably in the range of 3 to 15 μm, and more preferably in the range of 8 to 12 μm. Furthermore, the thickness of the antiglare hard coat layer is preferably in the range of 1.2 to 3 times the weight average particle diameter of the fine particles, and more preferably in the range of 1.2 to 2 times. When the thickness is within the predetermined range, it is easy to realize the surface shape of the antiglare hard coat film of the present invention in which a large number of fine irregularities exist independently, and the antiglare hard coat layer has sufficient hardness. (For example, the pencil hardness is 4H or more). Further, when the thickness is larger than the predetermined range, there is a problem that the curl is large and the line running property at the time of coating is lowered, and further, there is a problem that the antiglare property is lowered. Further, when the thickness is smaller than the predetermined range, there is a problem that glare cannot be prevented and the sharpness is lowered.

  The antiglare hard coat film of the present invention preferably has a haze value in the range of 5 to 30%. The haze value is a haze value (cloudiness) according to JIS K7136 (2000 version). The haze value is more preferably in the range of 5 to 20%, and still more preferably in the range of 5 to 10%. In order to set the haze value in the above range, the fine particles and the hard coat layer forming material are adjusted so that the refractive index difference between the fine particles and the hard coat layer forming material is in the range of 0.01 to 0.04. Is preferably selected. When the haze value is in the above range, a clear image can be obtained and the contrast in a dark place can be improved. If the haze value is too low, glare failure is likely to occur. However, if the antiglare hard coat film has a haze value in the above range, glare can be prevented.

In the antiglare hard coat film of the present invention, in the uneven shape on the surface of the antiglare hard coat layer, the ratio of the inclination angle of 0.5 ° or less when the inclination angle distribution is measured is 60% or less, and the inclination The ratio of the angle 5 ° or more is 3% or less. The inclination angle is calculated from the amount of displacement in the in-plane measurement direction (x direction) and the height direction (y direction) of the surface irregularities when the surface shape is measured. The calculation method of the inclination angle distribution is shown in FIG. FIG. 2A shows data obtained by measuring the surface shape (surface roughness). FIG. 2B shows the tilt angle data obtained by converting this data into an angle. The angle conversion is based on the amount of displacement between two points (P ₁ (x ₁ , y ₁ )) and P ₂ (x ₂ , y ₂ ) at a pitch of 0.53 μm (measured 7500 points at a surface roughness measurement length of 4 mm). And x ₁ −x ₂ is 0.53 μm.
Inclination angle T ₁ = arctan [(y ₁ −y ₂ ) / (x ₁ −x ₂ )] × 180 / π
FIG. 2C shows the inclination angle data represented by the appearance frequency. The ratio of the predetermined angle range in the inclination angle distribution can be calculated from the obtained inclination angle appearance frequency data.

  The ratio of the absolute value of the tilt angle of 0.5 ° or less is 60% or less, preferably in the range of 0 to 50%. In order to obtain anti-glare properties, it is necessary to suppress the reflection of external light to the front side. For that purpose, it is preferable to scatter the light on the front side. In the uneven surface shape of the antiglare hard coat film, if there are many flat surfaces, external light will be reflected, so it is preferable to reduce the flat surfaces. Therefore, it is effective to reduce the ratio of the small portion where the absolute value of the inclination angle is 0.5% or less to 60% or less.

  Further, the ratio of the inclination angle having an absolute value of 5 ° or more is 3% or less, preferably in the range of 0 to 2%. In order to prevent white blurring, it is preferable to prevent light from an oblique direction from being reflected to the front. On the surface of the antiglare hard coat film, it is necessary from the viewpoint of antiglare property to reduce the flat surface as described above. However, if the absolute value of the tilt angle is too large (a sharp convex portion is formed). If there are many), it will be easy to reflect the light from diagonally to the front. Therefore, it is effective to reduce the ratio of the large portion where the absolute value of the inclination angle is 5% or more to 3% or less.

  The antiglare hard coat film of the present invention is meaningful in that the surface shape is defined not in terms of the average inclination angle or the like but in the ratio of a predetermined inclination angle range. FIG. 3 is a diagram schematically showing surface shape profiles of two types of films having the same average inclination angle. Type 1 has uniform unevenness, and Type 2 has a portion with no unevenness. Both of these two are calculated to have an average inclination angle of 2.8 °, but optical characteristics such as anti-glare property, glare and white blur are greatly different. Therefore, it is important to evaluate the surface shape based on the tilt angle range and its ratio as defined in the present invention, not simply by the average tilt angle. By defining the tilt angle range and its ratio within the above range and further defining the thickness of the antiglare hard coat layer within the above range, it is possible to solve all of the improvement in antiglare property and the elimination of glare and white blur.

  The anti-glare hard coat film of the present invention has an incident angle of 30 or less and an incident angle of 45 or more in an incident angle of 15 or less in a bright place contrast measurement measured by mounting on a panel. It is preferable that the contrast with respect to light is 85 or more. The bright place contrast is a contrast measured in the presence of illumination (incident light), and can be measured by the method described in Examples described later. The incident angle is an angle from the normal line of the antiglare hard coat film. Therefore, incident light with a smaller incident angle is incident light from an angle closer to the normal direction.

  Incident light entering the antiglare hard coat film at an acute angle of 15 ° or less can be scattered to prevent reflection of external light. When the incident light having an incident angle of 15 ° or less is scattered, the front black luminance is increased, thereby reducing the contrast ratio (white luminance / black luminance) described in the embodiment. On the contrary, when the image is reflected, the incident light is regularly reflected, so that it is difficult for the light to face the front, the front black luminance is reduced, and the contrast ratio is increased. If the contrast with respect to incident light having an incident angle of 15 ° or less is 30 or less, reflection can be effectively prevented.

  Incident light entering the antiglare hard coat film at an obtuse angle of 45 ° or more can be scattered weakly to prevent white blurring. If the scattering is weak, it is difficult for the light to go to the front, and the front black luminance becomes small, thereby increasing the contrast ratio (white luminance / black luminance) described in the embodiment. Conversely, if the scattering is strong, the incident light tends to face the front, the front black luminance increases, and the contrast ratio decreases. When the contrast with respect to incident light having an incident angle of 45 ° or more is 85 or more, white blur can be effectively prevented.

  The antiglare hard coat film of the present invention is prepared, for example, by preparing an antiglare hard coat layer forming material containing the fine particles, the hard coat layer forming material, and a solvent, and the antiglare hard coat layer forming material is transparent. It can be produced by coating on at least one surface of a plastic film substrate to form a coating film, and curing the coating film to form the antiglare hard coat layer.

  The solvent is not particularly limited, and various solvents can be used. In order to obtain the antiglare hard coat film of the present invention, depending on the hard coat layer forming material composition, the kind of fine particles, the content, and the like. There are optimal solvent types and solvent ratios. Examples of the solvent include dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, acetone, methyl ethyl ketone (MEK). ), Diethyl ketone, dipropyl ketone, diisobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-pentyl acetate , Acetylacetone, diacetone alcohol, methyl acetoacetate, ethyl acetoacetate, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 1-pentano 2-methyl-2-butanol, cyclohexanol, isobutyl acetate, methyl isobutyl ketone (MIBK), 2-octanone, 2-pentanone, 2-hexanone, 2-heptanone, 3-heptanone, ethylene glycol monoethyl ether acetate, Examples thereof include ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, and propylene glycol monomethyl ether. These may be used alone or in combination of two or more.

  For example, when 5 parts by weight of fine particles are added to the hard coat layer forming material used in Example 1 described later, the solid content concentration is 45% by weight, and the thickness of the antiglare hard coat layer is about 10 μm. The ratio of MIBK / MEK is at least in the range of 1.5 / 1 to 2.0 / 1, and an antiglare hard coat film having the characteristics of the present invention is obtained. In the case of butyl acetate / MEK, an antiglare hard coat film having the characteristics of the present invention is obtained in the range of at least 1.5 / 1 to 3.0 / 1. When the component (B) is nanoparticles as in the hard coat layer forming material used in Example 1 described later, for example, depending on the type and mixing ratio of the solvent, the dispersed state of the nanoparticles and the fine particles It is presumed that the unevenness tendency of the surface of the antiglare hard coat layer changes due to the change in the thickness. However, the present invention is not limited or limited by this inference. For example, in the case of the hard coat layer forming material described later, when the solvent is MEK, cyclopentanone, ethyl acetate, acetone or the like, irregularities are easily formed on the surface, and the solvent is MIBK, toluene, butyl acetate, 2 In the case of -propanol, ethanol, etc., it is difficult to form irregularities on the surface. Therefore, in order to obtain an antiglare hard coat film having the characteristics of the present invention, it is also preferable to control the surface shape according to the type of solvent and the ratio of the solvent.

  Various leveling agents can be added to the antiglare hard coat layer forming material. Examples of the leveling agent include a fluorine-based or silicone-based leveling agent, and a silicone-based leveling agent is preferable. Examples of the silicone leveling agent include reactive silicone, polydimethylsiloxane, polyether-modified polydimethylsiloxane, and polymethylalkylsiloxane. Of these silicone leveling agents, the reactive silicone is particularly preferred. By adding the reactive silicone, slipperiness is imparted to the surface, and scratch resistance is maintained over a long period of time. In addition, when a reactive silicone having a hydroxyl group is used, an antireflection layer (low refractive index layer) containing a siloxane component is formed on the antiglare hard coat layer as described later. The adhesion between the antireflection layer and the antiglare hard coat layer is improved.

  The blending amount of the leveling agent is, for example, 5 parts by weight or less, preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the entire resin component.

  The material for forming the antiglare hard coat layer may include pigments, fillers, dispersants, plasticizers, ultraviolet absorbers, surfactants, antifouling agents, and antioxidants as long as the performance is not impaired. An agent, thixotropic agent, etc. may be added. These additives may be used alone or in combination of two or more.

  As the antiglare hard coat layer forming material, a conventionally known photopolymerization initiator can be used. Examples of the photopolymerization initiator include 2,2-dimethoxy-2-phenylacetophenone, acetophenone, benzophenone, xanthone, 3-methylacetophenone, 4-chlorobenzophenone, 4,4′-dimethoxybenzophenone, benzoinpropyl ether, benzyldimethyl Ketal, N, N, N ′, N′-tetramethyl-4,4′-diaminobenzophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, etc. Thioxanthone compounds and the like can be used.

  Examples of the method for coating the antiglare hard coat layer forming material on the transparent plastic film substrate include, for example, a phanten coating method, a die coating method, a spin coating method, a spray coating method, a gravure coating method, a roll coating method, A coating method such as a bar coating method can be used.

  The antiglare hard coat layer forming material is applied to form a coating film on the transparent plastic film substrate, and the coating film is cured. Prior to the curing, the coating film is preferably dried. The drying may be, for example, natural drying, air drying by blowing air, heat drying, or a combination of these.

The means for curing the coating film of the antiglare hard coat layer forming material is not particularly limited, but thermal curing or ionizing radiation curing is preferable, and ionizing radiation curing is more preferable. Various active energies can be used as a means for ionizing radiation curing, but ultraviolet rays are preferred. As the energy ray source, for example, a high pressure mercury lamp, a halogen lamp, a xenon lamp, a metal halide lamp, a nitrogen laser, an electron beam accelerator, a radioactive element, or the like is preferable. The irradiation amount of the energy ray source is preferably 50 to 5000 mJ / cm ² as an integrated exposure amount at an ultraviolet wavelength of 365 nm. When the irradiation amount is 50 mJ / cm ² or more, the curing becomes more sufficient, and the hardness of the formed antiglare hard coat layer becomes more sufficient. Moreover, if it is 5000 mJ / cm < ² > or less, coloring of the anti-glare hard-coat layer formed can be prevented.

  As described above, the antiglare hard coat film of the present invention can be produced by forming the antiglare hard coat layer on at least one surface of the transparent plastic film substrate. In addition, you may manufacture the anti-glare hard coat film of this invention with manufacturing methods other than the above-mentioned method. The hardness of the antiglare hard coat film of the present invention is affected by the thickness of the layer in pencil hardness, but has a hardness of 2H or more, for example.

  As an example of the antiglare hard coat film of the present invention, one having an antiglare hard coat layer formed on one surface of a transparent plastic film substrate can be mentioned. The antiglare hard coat layer contains fine particles, whereby the surface of the antiglare hard coat layer has an uneven shape. In this example, the antiglare hard coat layer is formed on one side of the transparent plastic film substrate. However, the present invention is not limited to this, and the antiglare hard coat is formed on both sides of the transparent plastic film substrate. It may be an antiglare hard coat film in which a layer is formed. In addition, the antiglare hard coat layer of this example is a single layer, but the present invention is not limited thereto, and the antiglare hard coat layer has a multilayer structure in which two or more layers are laminated. May be.

  In the antiglare hard coat film of the present invention, an antireflection layer (low refractive index layer) may be disposed on the antiglare hard coat layer. In the antiglare hard coat film of this example, an antiglare hard coat layer containing fine particles is formed on one side of a transparent plastic film substrate, and an antireflection layer is formed on the antiglare hard coat layer. It is the composition of being. When light strikes an object, it repeats the phenomenon of reflection at the interface, absorption inside, and scattering, and passes through the back of the object. For example, when an anti-glare hard coat film is attached to an image display device, light reflection at the interface between air and the anti-glare hard coat layer is one of the factors that lower the image visibility. The antireflection layer reduces the surface reflection. The antiglare hard coat layer and the antireflection layer may be formed on both surfaces of the transparent plastic film substrate. Further, the antiglare hard coat layer and the antireflection layer may each have a multilayer structure in which two or more layers are laminated.

  In the present invention, the antireflection layer is an optical thin film in which thickness and refractive index are strictly controlled, or a laminate of two or more optical thin films. The antireflection layer exhibits an antireflection function by canceling out the reversed phases of incident light and reflected light using the interference effect of light. The wavelength region of visible light that exhibits the antireflection function is, for example, 380 to 780 nm, and the wavelength region with particularly high visibility is in the range of 450 to 650 nm, and the reflectance at 550 nm, which is the central wavelength, is minimized. Thus, it is preferable to design the antireflection layer.

  In designing the antireflection layer based on the light interference effect, as a means for improving the interference effect, for example, there is a method of increasing the refractive index difference between the antireflection layer and the antiglare hard coat layer. In general, in a multilayer antireflection layer having a structure in which two to five optical thin layers (thin films whose thickness and refractive index are strictly controlled) are laminated, a plurality of components having different refractive indexes are formed in a predetermined thickness. Thus, the degree of freedom in optical design of the antireflection layer is increased, the antireflection effect can be further improved, and the spectral reflection characteristics can be made uniform (flat) in the visible light region. Since the optical thin film requires high thickness accuracy, each layer is generally formed by a dry method such as vacuum evaporation, sputtering, or CVD.

  The multilayer antireflection layer has a two-layer structure in which a low refractive index silicon oxide layer (refractive index: about 1.45) is laminated on a high refractive index titanium oxide layer (refractive index: about 1.8). More preferably, a four-layer structure in which a silicon oxide layer is laminated on a titanium oxide layer, a titanium oxide layer is laminated on the silicon oxide layer, and a silicon oxide layer is laminated on the titanium oxide layer. belongs to. By forming these two-layer antireflection layers or four-layer antireflection layers, it is possible to uniformly reduce reflection in the visible light wavelength region (for example, a range of 380 to 780 nm).

  Moreover, it is possible to exhibit the antireflection effect by forming a single-layer optical thin film (antireflection layer) on the antiglare hard coat layer. In general, for forming the single-layer antireflection layer, for example, a wet method such as phanten coating, die coating, spin coating, spray coating, gravure coating, roll coating, or bar coating is employed.

  The material for forming the single-layer antireflection layer is, for example, a resin material such as an ultraviolet curable acrylic resin, a hybrid material in which inorganic fine particles such as colloidal silica are dispersed in the resin, tetraethoxysilane, titanium tetraethoxide, or the like. Examples include sol-gel materials using metal alkoxides. Moreover, in the said forming material, what contains a fluorine group is preferable for imparting antifouling properties to the surface. In the forming material, for reasons such as scratch resistance, a forming material having a high inorganic component content is preferable, and the sol-gel material is more preferable. The sol-gel material can be used after partial condensation.

  The antireflection layer (low refractive index layer) may contain an inorganic sol in order to improve the film strength. The inorganic sol is not particularly limited, and examples thereof include inorganic sols such as silica, alumina, and magnesium fluoride. Among these, silica sol is preferable. The blending ratio of the inorganic sol is, for example, in the range of 10 to 80 parts by weight with respect to 100 parts by weight of the total solid content of the antireflection layer forming material. The particle size of the inorganic fine particles in the inorganic sol is preferably in the range of 2 to 50 nm, and more preferably in the range of 5 to 30 nm.

  The material for forming the antireflection layer preferably contains hollow spherical silicon oxide ultrafine particles. The silicon oxide ultrafine particles preferably have an average particle diameter of about 5 to 300 nm, and more preferably in the range of 10 to 200 nm. The silicon oxide ultrafine particles are, for example, hollow spheres in which cavities are formed in the outer shells having pores, and the cavities include at least one of a solvent and a gas when preparing the silicon oxide ultrafine particles. It is a thing. Moreover, it is preferable that the precursor substance for forming the said cavity of the said silicon oxide ultrafine particle remains in the said cavity. The thickness of the outer shell is preferably in the range of about 1 to 50 nm and in the range of about 1/50 to 1/5 of the average particle diameter of the silicon oxide ultrafine particles. The outer shell is preferably formed from a plurality of coating layers. Further, in the silicon oxide ultrafine particles, it is preferable that the pores are closed and the cavity is sealed by the outer shell. This is because the porous or voids of the silicon oxide ultrafine particles are maintained in the antireflection layer, and the refractive index of the antireflection layer can be further reduced. As a method for producing such hollow and spherical silicon oxide ultrafine particles, for example, the method for producing silica-based fine particles disclosed in JP-A-2000-233611 is suitably employed.

  The temperature of drying and curing when forming the antireflection layer (low refractive index layer) is not particularly limited, and is, for example, in the range of 60 to 150 ° C, preferably in the range of 70 to 130 ° C. The drying and curing time is, for example, in the range of 1 to 30 minutes, and when considering productivity, the range of 1 to 10 minutes is preferable. Further, after the drying and curing, a high-hardness antiglare hard coat film having an antireflection layer can be obtained by further heat treatment. The temperature of the heat treatment is not particularly limited, and is, for example, in the range of 40 to 130 ° C., preferably in the range of 50 to 100 ° C. The heat treatment time is not particularly limited, and for example, 1 minute to From the viewpoint of improving scratch resistance for 100 hours, it is more preferable to carry out for 10 hours or more. The heat treatment can be performed by a method using a hot plate, an oven, a belt furnace, or the like.

  When an anti-glare hard coat film having an antireflection layer is mounted on an image display device, the antireflection layer is frequently the outermost layer, and thus is easily contaminated by the external environment. Antireflection layers are more prone to contamination than mere transparent plates.For example, surface reflectance changes due to adhesion of contaminants such as fingerprints, hand dirt, sweat, and hairdressing materials, and the deposits appear white. The displayed content may be unclear. In order to prevent the adhesion of contaminants and improve the ease of removing the adhered contaminants, a contamination prevention layer formed of a fluorine group-containing silane compound or fluorine group-containing organic compound is laminated on the antireflection layer. It is preferable to do.

  In the antiglare hard coat film of the present invention, it is preferable to perform a surface treatment on at least one of the transparent plastic film substrate and the antiglare hard coat layer. If the surface of the transparent plastic film substrate is surface-treated, the adhesion to the antiglare hard coat layer, the polarizer or the polarizing plate is further improved. Further, if the surface of the antiglare hard coat layer is surface-treated, the adhesion with the antireflection layer, the polarizer or the polarizing plate is further improved. Examples of the surface treatment include low-pressure plasma treatment, ultraviolet irradiation treatment, corona treatment, flame treatment, and acid or alkali treatment. As the surface treatment when a triacetyl cellulose film is used as the transparent plastic film substrate, alkali treatment is preferable. This alkali treatment can be carried out, for example, by bringing the triacetyl cellulose film surface into contact with an alkali solution, washing with water and drying. As the alkaline solution, for example, potassium hydroxide solution and sodium hydroxide solution can be used. The specified concentration of hydroxide ions in the alkaline solution is preferably in the range of 0.1 to 3.0 N (mol / L), more preferably in the range of 0.5 to 2.0 N (mol / L). .

  In the antiglare hard coat film in which the antiglare hard coat layer is formed on one surface of the transparent plastic film substrate, the other surface may be subjected to a solvent treatment in order to prevent curling. Good. The solvent treatment can be carried out by contacting a solvent capable of dissolving the transparent plastic film substrate or a solvent capable of swelling. Curling can be prevented by applying a force to curl the other surface by the solvent treatment, thereby offsetting the force to curl by forming the antiglare hard coat layer. Similarly, in the antiglare hard coat film in which the antiglare hard coat layer is formed on one surface of the transparent plastic film substrate, in order to prevent curling, a transparent resin layer is provided on the other surface. It may be formed. Examples of the transparent resin layer include a layer mainly composed of a thermoplastic resin, a radiation curable resin, a thermosetting resin, and other reactive resins. Among these, a layer mainly composed of a thermoplastic resin is particularly preferable.

  In the antiglare hard coat film of the present invention, the transparent plastic film substrate side can usually be bonded to an optical member used in an LCD via an adhesive or an adhesive. In addition, in this bonding, various surface treatments as described above may be performed on the surface of the transparent plastic film substrate.

  Examples of the optical member include a polarizer and a polarizing plate. Generally, the polarizing plate has a transparent protective film on one side or both sides of the polarizer. When providing a transparent protective film on both surfaces of a polarizer, the same material may be sufficient as the transparent protective film of front and back, and a different material may be sufficient as it. The polarizing plates are usually disposed on both sides of the liquid crystal cell. Further, the polarizing plates are arranged so that the absorption axes of the two polarizing plates are substantially orthogonal to each other.

  Next, an optical member in which the antiglare hard coat film of the present invention is laminated will be described by taking a polarizing plate as an example. A polarizing plate having the function of the present invention can be obtained by laminating the antiglare hard coat film of the present invention with a polarizer or a polarizing plate using an adhesive or a pressure-sensitive adhesive.

  The polarizer is not particularly limited, and various types can be used. Examples of the polarizer include hydrophilic polymer films such as polyvinyl alcohol film, partially formalized polyvinyl alcohol film, and ethylene / vinyl acetate copolymer partially saponified film, and iodine and dichroic dyes. Examples thereof include a polyene-based oriented film such as a film obtained by adsorbing a chromatic substance and uniaxially stretched, a dehydrated polyvinyl alcohol product or a dehydrochlorinated polyvinyl chloride product. Among these, a polarizer comprising a polyvinyl alcohol film and a dichroic substance such as iodine is preferable because of its high polarization dichroic ratio. Although the thickness in particular of the said polarizer is not restrict | limited, For example, it is about 5-80 micrometers.

  A polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it can be prepared by, for example, dying a polyvinyl alcohol film in an aqueous solution of iodine and stretching it 3 to 7 times the original length. it can. The aqueous solution of iodine may contain boric acid, zinc sulfate, zinc chloride or the like, if necessary. Alternatively, the polyvinyl alcohol film may be immersed in an aqueous solution containing boric acid, zinc sulfate, zinc chloride or the like. If necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing. By washing the polyvinyl alcohol film with water, it is possible to clean the surface of the polyvinyl alcohol film and anti-blocking agents. In addition, the polyvinyl alcohol film is swollen to prevent unevenness such as uneven coloring. There is also an effect. Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching. The film can be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.

  As the transparent protective film provided on one side or both sides of the polarizer, those having excellent transparency, mechanical strength, thermal stability, moisture shielding property, retardation value stability and the like are preferable. Examples of the material for forming the transparent protective film include the same materials as those for the transparent plastic film substrate.

  Moreover, as a transparent protective film, the polymer film as described in Unexamined-Japanese-Patent No. 2001-343529 (WO01 / 37007) is mention | raise | lifted. The polymer film described in the publication includes, for example, (A) a thermoplastic resin having at least one imide group of a substituted imide group and an unsubstituted imide group on the side chain, and (B) a substituted phenyl group and an unsubstituted group on the side chain. Examples thereof include a polymer film formed from a resin composition containing at least one phenyl group of a phenyl group and a thermoplastic resin having a nitrile group. Examples of the polymer film formed from the resin composition include a polymer film formed from a resin composition containing an alternating copolymer composed of isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer. can give. The polymer film can be produced by extruding the resin composition into a film. The polymer film has a small phase difference and a small photoelastic coefficient, and therefore, when applied to a protective film such as a polarizing plate, it can eliminate problems such as unevenness due to distortion and has a low moisture permeability. Excellent in humidification durability.

  The transparent protective film is preferably a film made of a cellulose resin such as triacetyl cellulose or a film made of a norbornene resin from the viewpoints of polarization characteristics and durability. Examples of the commercial product of the transparent protective film include trade name “Fujitac” (manufactured by FUJIFILM Corporation), trade name “ZEONOR” (manufactured by ZEON Corporation), trade name “ARTON” (manufactured by JSR Corporation), and the like. .

  The thickness of the transparent protective film is not particularly limited, but is, for example, in the range of 1 to 500 μm from the viewpoints of workability such as strength, handleability, and thin layer properties. If it is the said range, a polarizer will be protected mechanically, and even if it exposes to high temperature and high humidity, a polarizer will not shrink | contract and it can maintain the stable optical characteristic. The thickness of the transparent protective film is preferably in the range of 5 to 200 μm, and more preferably in the range of 10 to 150 μm.

  The configuration of the polarizing plate in which the antiglare hard coat film is laminated is not particularly limited. For example, the transparent protective film, the polarizer and the transparent protective film are arranged in this order on the antiglare hard coat film. The structure which laminated | stacked by this, and the structure which laminated | stacked the said polarizer and the said transparent protective film in this order on the said glare-proof hard coat film may be sufficient.

  The image display device of the present invention has the same configuration as the conventional image display device except that the antiglare hard coat film of the present invention is used. For example, in the case of an LCD, it can be manufactured by appropriately assembling each component such as a liquid crystal cell, an optical member such as a polarizing plate, and an illumination system (backlight or the like) as necessary and incorporating a drive circuit.

  The liquid crystal display device of the present invention is used for any appropriate application. Applications include, for example, OA devices such as personal computer monitors, laptop computers, and copy machines, mobile phones, watches, digital cameras, personal digital assistants (PDAs), portable devices such as portable game machines, video cameras, televisions, microwave ovens, etc. Household electrical equipment, back monitor, car navigation system monitor, car audio and other in-vehicle equipment, display equipment for commercial store information monitors, security equipment such as monitoring monitors, nursing care monitors, medical monitors, etc. Nursing care / medical equipment.

  Next, examples of the present invention will be described together with comparative examples. However, the present invention is not limited by the following examples and comparative examples. Various characteristics in the following examples and comparative examples were evaluated or measured by the following methods.

(Haze value)
The measuring method of haze was measured using a haze meter HM-150 (manufactured by Murakami Color Research Laboratory Co., Ltd.) according to the haze (cloudiness) of JIS K7136 (2000 version).

(Inclination angle)
A glass plate (thickness 1.3 mm) made by MATSUNAMI is bonded to the surface of the antiglare hard coat film on which the antiglare hard coat layer is not formed, and a high precision fine shape measuring instrument (trade name; The surface shape of the antiglare hard coat layer was measured at a measurement length of 4 mm in the coating direction using Surfcorder ET4000 (manufactured by Kosaka Laboratory Ltd.). Inclination angle is calculated by converting the displacement in the in-plane measurement direction (x direction) and the surface unevenness height direction (y direction) of the data obtained by measuring the surface shape (surface roughness), and the inclination angle data did. And the ratio of the predetermined angle range in inclination angle distribution was calculated from the data which expressed this inclination angle data by appearance frequency. In addition, the angle conversion is the displacement between two points (P ₁ (x ₁ , y ₁ )) and P ₂ (x ₂ , y ₂ ) at a pitch of 0.53 μm (measured at 7500 points at a surface roughness measurement length of 4 mm). The amount was calculated from the following equation, where x ₁ -x ₂ is 0.53 μm.
Inclination angle T ₁ = arctan [(y ₁ −y ₂ ) / (x ₁ −x ₂ )] × 180 / π

(Contrast, black brightness)
(1) The surface of the antiglare hard coat film on which the antiglare hard coat layer was not formed was bonded to a polarizing plate having a smooth surface via an acrylic adhesive (thickness: about 20 μm).
(2) The polarizing plate with an antiglare hard coat film was attached to the central portion of a liquid crystal panel (manufactured by Sharp Corporation, panel model number LQ150X1LAJO).
(3) As schematically shown in FIG. 4A, a light receiver 2 (manufactured by MINOLTA, SPECTORADIOMETER CS1000A, 1 ° field of view) is disposed above the liquid crystal panel 1 on which the polarizing plate with the antiglare hard coat film is mounted. Were installed so as to be parallel to the liquid crystal panel 1. The distance H1 between the liquid crystal panel 1 and the light receiver 2 was 50 cm. Ring illumination 3 (diameter 37 mm, MHF-G150LR manufactured by MORITEX) was installed above the liquid crystal panel 1 so that the height H2 was 18.5 mm. The measured value at this installation position was taken as the value of “45 ° incidence”. Further, as schematically shown in FIG. 4B, the measured value when installed so that H1 is 50 cm and H2 is 69.0 mm was set to a value of “15 ° incidence”.
(4) An illuminometer (manufactured by TOPCON, ILLUMINATE METER) (not shown) was used, and the illuminance on the surface of the liquid crystal panel 1 just below the center of the ring illumination 3 was adjusted to 400 Lx.
(5) The image of the panel 1 was switched between black display and white display, and the values obtained by measuring the luminance in black display and the luminance in white display at the central portion of the polarizing plate were defined as black luminance and white luminance, respectively. The contrast ratio (white luminance / black luminance) was calculated from the obtained measured values.
(6) Contrast ratio measured by the method of (1) to (5) above using a hard coat film prepared in the same manner as in Example 1 except that fine particles (crosslinked particles of acrylic and styrene) were not blended. With (actual measurement value 312) as a reference value 100, the measurement values in the examples and comparative examples were normalized.

(Anti-glare evaluation)
(1) A black acrylic plate (Mitsubishi Rayon Co., Ltd., thickness: 2.0 mm) is bonded to the surface of the antiglare hard coat film on which the antiglare hard coat layer is not formed, and the back surface is reflected. A sample was prepared without the.
(2) In general, the antiglare property of the sample prepared above was visually determined in an office environment (about 1000 Lx) using a display.
Judgment criteria AA: Although there is an image reflection, the influence on the visibility is small.
A: Although there is an image reflection, there is no practical problem.
B: There is an image reflection, and there is a problem in practical use.

(Glare evaluation)
The surface on which the antiglare hard coat layer of the antiglare hard coat film was not formed was bonded to a glass plate having a thickness of 1.3 mm to obtain a measurement sample. This sample was set on a mask pattern placed on a backlight (made by Hakuba Photo Industry Co., Ltd., trade name “Light Viewer 5700”). As the mask pattern, a lattice pattern (212 ppi) having an opening of 60 μm × 200 μm, a vertical line width of 60 μm, and a horizontal line width of 200 μm was used. The distance from the mask pattern to the antiglare hard coat layer was 1.3 mm, and the distance from the backlight to the mask pattern was 1.5 mm. And the glare of the said glare-proof hard coat film was determined visually by the following criteria.
Judgment standard AAA: Almost no glare is recognized.
AA: Although there is glare, the level of influence on visibility is small.
A: Although there is glare, there is no problem in practical use.
B: Slight glare and practically problematic level.

(White blur evaluation)
(1) A black acrylic plate (manufactured by Nitto Resin Co., Ltd., thickness 1.0 mm) is bonded to the surface of the antiglare hard coat film on which the antiglare hard coat layer is not formed, A sample with no reflection was produced.
(2) Generally, in an office environment using a display (about 1000 Lx), the white blur phenomenon is visually observed when viewed from a direction of 60 ° with the vertical direction as a reference (0 °) with respect to the plane of the sample prepared above. And evaluated according to the following criteria.
Criteria AA: Almost no white blur.
A: There is white blur but the effect on visibility is small.
B: White blurring is strong and the visibility is remarkably lowered.

(Refractive index of transparent plastic film substrate and hard coat layer)
The refractive index of the transparent plastic film substrate and the hard coat layer was selected from the Abgo refractometer (trade name: DR-M2 / 1550) manufactured by Atago Co., and monobromonaphthalene was selected as an intermediate solution. Measurement was performed by a specified measurement method shown in the apparatus so that measurement light was incident on the measurement surface of the hard coat layer.

(Refractive index of fine particles)
Fine particles are placed on a slide glass, a refractive index standard solution is dropped onto the fine particles, and a cover glass is placed over to prepare a sample. The sample was observed with a microscope, and the refractive index of the refractive index standard solution in which the contour of the fine particles was most difficult to be seen at the interface with the refractive index standard solution was defined as the refractive index of the fine particles.

(Weight average particle diameter of fine particles)
The weight average particle diameter of the fine particles was measured by a Coulter counting method. Specifically, using a particle size distribution measuring device (trade name: Coulter Multisizer, manufactured by Beckman Coulter, Inc.) using the pore electrical resistance method, electrolysis corresponding to the volume of the particulates when the particulates pass through the pores. By measuring the electrical resistance of the liquid, the number and volume of fine particles were measured, and the weight average particle diameter was calculated.

(Thickness of the antiglare hard coat layer)
Anti-glare hard coat layer by measuring the total thickness of the anti-glare hard coat film using a micro gauge thickness gauge manufactured by Mitutoyo Co., Ltd. and subtracting the thickness of the transparent plastic film substrate from the total thickness. The thickness of was calculated.

(Example 1)
A hard coat layer forming material (JSR Co., Ltd.) containing the component (A) in which nano-silica particles (component (B)) formed by bonding inorganic oxide particles and an organic compound containing a polymerizable unsaturated group are dispersed. Product name “OPSTAR Z7540”, solid content: 56 wt%, solvent: butyl acetate / methyl ethyl ketone (MEK) = 76/24). The hard coat layer forming material is composed of (A) component: dipentaerythritol and isophorone diisocyanate polyurethane, (B) component: silica fine particles whose surface is modified with organic molecules (weight average particle size of 100 nm or less), (A) component Total: (B) component = 2: 3. The refractive index of the cured film of the hard coat layer forming material was 1.485. Crosslinked particles of acrylic and styrene (trade name “Techpolymer XX80AA” manufactured by Sekisui Plastics Co., Ltd., weight average particle diameter: 5.5 μm) as fine particles per 100 parts by weight of resin solid content of the hard coat layer forming material. , Refractive index: 1.515) 5 parts by weight, leveling agent (manufactured by Dainippon Ink & Chemicals, Inc., trade name “GRANDIC PC-4100”) 0.1 part by weight, photopolymerization initiator (Ciba Specialty) -0.5 weight part of chemicals company make, brand name "Irgacure 127") was mixed. This mixture was diluted so that the solid concentration was 45% by weight and the butyl acetate / MEK ratio was 2/1 to prepare an antiglare hard coat layer forming material.

A triacetyl cellulose film (manufactured by Fuji Film Co., Ltd., trade name “TD80UL”, thickness: 80 μm, refractive index: 1.48) was prepared as a transparent plastic film substrate. The antiglare hard coat layer forming material was applied to one side of the transparent plastic film substrate using a comma coater to form a coating film. Subsequently, the said coating film was dried by heating at 100 degreeC for 1 minute. Thereafter, ultraviolet light with an integrated light quantity of 300 mJ / cm ² was irradiated with a high-pressure mercury lamp, the coating film was cured to form an antiglare hard coat layer having a thickness of 9 μm, and the antiglare hard coat film of Example 1 was formed. Got. The inclination angle distribution of the obtained antiglare hard coat film is shown in FIG. In FIG. 1, the horizontal axis represents the tilt angle, and the vertical axis represents the frequency.

(Example 2)
The antiglare hard coat film of Example 2 was prepared in the same manner as in Example 1 except that the mixture was diluted so that the solid content concentration was 45% by weight and the butyl acetate / MEK ratio was 3/1. Got.

(Example 3)
Except for using “Techpolymer XX79AA” (manufactured by Sekisui Plastics Co., Ltd., weight average particle size: 5.5 μm, refractive index: 1.505), which is a crosslinked particle of acrylic and styrene, as the fine particles, In the same manner as in Example 1, an antiglare hard coat film of Example 3 was obtained.

Example 4
The antiglare hard coat film of Example 4 was prepared in the same manner as in Example 1 except that the antiglare hard coat layer forming material of Example 1 was used and an antiglare hard coat layer having a thickness of 11 μm was formed. Got.

(Example 5)
As a hard coat layer forming material, a resin containing the following components (manufactured by Dainippon Ink and Chemicals, trade name “GRANDIC PC1071”, solid content: 66% by weight) was prepared. The refractive index of the cured film of the hard coat layer forming material was 1.52. Acrylic particles (trade name “SSX-106” manufactured by Sekisui Plastics Co., Ltd., weight average particle diameter: 6.0 μm, refractive index: 1.49 per 100 parts by weight of resin solid content of the hard coat layer forming material. 15 parts by weight and 0.5 parts by weight of a leveling agent (Dainippon Ink Chemical Co., Ltd., trade name “GRANDIC PC-4100”) was mixed. Most of the aspect ratio of the acrylic particles was 1.05. This mixture is diluted with a mixed solvent (butyl acetate: ethyl acetate = 58: 42 (weight ratio)) so that the solid content concentration is 35% by weight to prepare an antiglare hard coat layer forming material. did. The leveling agent is a copolymer obtained by copolymerization at a molar ratio of dimethylsiloxane: hydroxypropylsiloxane: 6-isocyanatohexyl isocyanuric acid: aliphatic polyester = 6.3: 1.0: 2.2: 1.0. It is a thing.
Component (D): urethane acrylate (100 parts by weight) comprising pentaerythritol acrylate and hydrogenated xylene diisocyanate
(E) component: dipentaerythritol hexaacrylate (49 parts by weight),
Pentaerythritol tetraacrylate (41 parts by weight)
Pentaerythritol triacrylate (24 parts by weight)
Component (F): a mixture of a polymer and a copolymer having a repeating unit represented by the general formula (1) (59 parts by weight)
Photopolymerization initiator: Trade name “Irgacure 184” (manufactured by Ciba Specialty Chemicals) (5 parts by weight)
Mixed solvent: butyl acetate: ethyl acetate (weight ratio) = 89: 11

The antiglare hard coat layer forming material was applied to one side of the transparent plastic film substrate using a bar coater to form a coating film. Subsequently, the said coating film was dried by heating at 100 degreeC for 1 minute. Thereafter, the metal halide lamp was irradiated with ultraviolet rays having an integrated light quantity of 300 mJ / cm ² , the coating film was cured to form an antiglare hard coat layer having a thickness of 11 μm, and the antiglare hard coat film of Example 5 was formed. Obtained.

(Comparative Example 1)
The antiglare hard coat film of Comparative Example 1 was prepared in the same manner as in Example 1 except that the antiglare hard coat layer forming material of Example 1 was used and a 15 μm thick antiglare hard coat layer was formed. Got.

(Comparative Example 2)
The antiglare of Comparative Example 2 was prepared in the same manner as in Example 1 except that the mixture of Example 1 was diluted so that the solid content concentration was 45% by weight and the butyl acetate / MEK ratio was 5/1. A hard coat film was obtained.

(Comparative Example 3)
In Example 1, the mixed amount of the acrylic and styrene crosslinked particles was set to 15 parts by weight per 100 parts by weight of the resin solid content of the hard coat layer forming material. 3 antiglare hard coat film was obtained.

(Comparative Example 4)
As a hard coat layer forming material, an ultraviolet curable resin composed of isocyanuric acid triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate and isophorone diisocyanate polyurethane was prepared. The refractive index of the cured film of the hard coat layer forming material was 1.53. Leveling agent (manufactured by Dainippon Ink & Chemicals, Inc., trade name “Defenser MCF323”), polystyrene particles (manufactured by Soken Chemical Co., Ltd.) per 100 parts by weight of resin solid content of the hard coat layer forming material , Trade name “Chemisnow SX350H”, weight average particle size: 3.5 μm, refractive index: 1.59) 14 parts by weight and photopolymerization initiator (trade name “Irgacure 184” manufactured by Ciba Specialty Chemicals) 5 weight Part is dissolved or dispersed in a mixed solvent (toluene: butyl acetate: ethyl acetate = 86.5: 1.0: 12.5 (weight ratio)) so that the solid content concentration is 45% by weight, and antiglare A hard coat layer forming material was prepared.

The antiglare hard coat layer forming material was applied to one side of the transparent plastic film substrate using a comma coater to form a coating film. Subsequently, the said coating film was dried by heating at 100 degreeC for 1 minute. Thereafter, the metal halide lamp was irradiated with ultraviolet rays having an integrated light amount of 300 mJ / cm ² , the coating film was cured to form an antiglare hard coat layer having a thickness of 5 μm, and the antiglare hard coat film of Comparative Example 4 was formed. Obtained.

(Comparative Example 5)
As the crosslinked particles of acrylic and styrene, “Techpolymer XX94AA” (manufactured by Sekisui Plastics Co., Ltd., weight average particle diameter: 6.0 μm, refractive index: 1.495) was used, and the mixing amount was the same as in Comparative Example 7 above. The antiglare property of Comparative Example 5 was the same as that of Comparative Example 4 except that the hard coat layer forming material was 10 parts by weight per 100 parts by weight of resin solid content and a 10 μm thick antiglare hard coat layer was formed. A hard coat film was obtained.

(Comparative Example 6)
As a hard coat layer forming material, an ultraviolet curable resin composed of isocyanuric acid triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate and isophorone diisocyanate polyurethane was prepared. The refractive index of the cured film of the hard coat layer forming material was 1.53. Leveling agent (trade name “Megafac F-470N” manufactured by Dainippon Ink and Chemicals, Inc.) 0.5 parts by weight per 100 parts by weight of resin solid content of the hard coat layer forming material, amorphous silica particles (Fuji Product name “Silo Hovic 702”, manufactured by Silysia Chemical Co., Ltd., 8 parts by weight of weight average particle size: 2.5 μm, refractive index: 1.46, and photopolymerization initiator (product of Ciba Specialty Chemicals Co., Ltd.) Name “Irgacure 184”) is dissolved or dispersed in a mixed solvent (toluene: butyl acetate = 85: 15 (weight ratio)) so that the solid content concentration is 38% by weight, and an antiglare hard coat A layer forming material was prepared.

The antiglare hard coat layer forming material was applied to one side of the transparent plastic film substrate using a comma coater to form a coating film. Subsequently, the said coating film was dried by heating at 100 degreeC for 1 minute. Thereafter, the metal halide lamp was irradiated with ultraviolet rays having an integrated light quantity of 300 mJ / cm ² , the coating film was cured to form an antiglare hard coat layer having a thickness of 5 μm, and the antiglare hard coat film of Comparative Example 6 was formed. Obtained.

(Comparative Example 7)
As a hard coat layer forming material, a resin containing the components shown in Example 5 (manufactured by Dainippon Ink and Chemicals, trade name “GRANDIC PC1071”, solid content: 66% by weight) was prepared. The refractive index of the cured film of the hard coat layer forming material was 1.52. Acrylic particles (trade name “MBX-8SSTN” manufactured by Sekisui Plastics Co., Ltd., weight average particle diameter: 8.0 μm, refractive index: 1.49 per 100 parts by weight of resin solid content of the hard coat layer forming material. ) And 30 parts by weight of the same leveling agent as used in Example 5 (Dainippon Ink Chemical Co., Ltd., trade name “GRANDIC PC-4100”) was mixed. Most of the aspect ratio of the acrylic particles was 1.05. The mixture was diluted with ethyl acetate so that the ethyl acetate ratio to the total solvent was 54% by weight (butyl acetate: ethyl acetate = 46: 54 (weight ratio)) and the solid content concentration was 55% by weight. An antiglare hard coat layer forming material was prepared.

The antiglare hard coat layer forming material was applied to one side of the transparent plastic film substrate using a bar coater to form a coating film. Subsequently, the said coating film was dried by heating at 100 degreeC for 1 minute. Thereafter, the metal halide lamp was irradiated with ultraviolet rays having an integrated light quantity of 300 mJ / cm ² , the coating film was cured to form an antiglare hard coat layer having a thickness of 25 μm, and the antiglare hard coat film of Comparative Example 7 was formed. Obtained.

  Various characteristics were measured or evaluated for the antiglare hard coat films of Examples 1 to 5 and Comparative Examples 1 to 7 thus obtained. The results are shown in Table 1 below.

  As shown in Table 1, in the examples, good results were obtained for all of antiglare properties, glare and white blur. On the other hand, in Comparative Examples 1 to 6, although good results were obtained for some of the antiglare properties, glare and white blur, good results were not obtained for all the characteristics. That is, in Comparative Examples 1 and 2, since the ratio of the inclination angle of 0.5 ° or less is high, the antiglare property and the glare are not good. Moreover, the contrast with respect to 15 degrees or less incident light is high, and it is not favorable in anti-glare property and glare. About Comparative Examples 3-6, since the ratio of inclination-angle 5 degrees or more is high, white blurring was strong and visibility fell remarkably. Moreover, since the contrast with respect to incident light of 45 ° or more is low, white blurring is strong and visibility is remarkably lowered. In Comparative Example 7, the antiglare property, glare and white blur were good results, but the antiglare hard coat layer was thick and easily cracked. . Moreover, since it is thick, shrinkage | curing shrinkage | contraction etc. become strong, there exists a possibility that the conveyance property and handling of a film may become difficult, and it also becomes high cost. By measuring the range and ratio of the tilt angle defined in the present invention and the contrast at a predetermined incident angle, it is also possible to grasp the tendency of visibility such as anti-glare property, glare and white blur without visual evaluation. Is possible.

  According to the anti-glare hard coat film of the present invention, it is possible to solve all of the conflicting issues of high contrast, ensuring anti-glare properties, preventing white blur, and supporting high definition. Therefore, the antiglare hard coat film of the present invention can be suitably used, for example, for optical members such as polarizing plates, image display devices such as liquid crystal panels and LCDs, and its application is not limited and can be applied to a wide range of fields. is there. Furthermore, by measuring the range and the ratio of the tilt angle defined in the present invention and the contrast at a predetermined incident angle, the tendency of visibility such as anti-glare property, glare and white blur is grasped without visual evaluation. This is also effective as an index for evaluating an antiglare film.

1 is a graph showing the inclination angle distribution of the cross-sectional surface shape of the antiglare hard coat film of Example 1. FIG. FIG. 2 is a schematic diagram showing a method of calculating the inclination angle distribution in the present invention. (A) is a profile obtained by measuring the surface shape (surface roughness) of an antiglare hard coat film, (b) is a profile obtained by converting the data of (a) into angle data, and (c) is an angle of inclination. It is the graph which expressed data by appearance frequency. FIG. 3 is a schematic diagram for explaining the difference between the inclination angle and the average inclination angle. FIG. 4 is a schematic diagram for explaining a contrast measurement method according to the present invention.

Explanation of symbols

1 LCD panel 2 Receiver 3 Ring illumination

Claims (11)

An antiglare hard coat film having an antiglare hard coat layer containing fine particles on at least one surface of a transparent plastic film substrate, wherein the antiglare hard coat layer has a thickness of 15 μm or less; and In the uneven shape on the surface of the antiglare hard coat layer, the ratio of the absolute value of the inclination angle when measuring the inclination angle distribution is 0.5% or less is 60% or less, and the absolute value of the inclination angle is 5 °. The above ratio is 3% or less, an antiglare hard coat film. An anti-glare hard coat film, and in a bright place contrast measurement which is measured by mounting on a panel, the incident light with an incident angle of 15 ° or less and an incident angle of 30 ° or less and an incident angle of 45 ° or more The antiglare hard coat film according to claim 1, wherein the contrast with respect to is 85 or more. The antiglare property according to claim 1 or 2, wherein the antiglare hard coat layer is formed using the fine particles and a hard coat layer forming material containing the following components (A) and (B). Hard coat film.
(A) component: a curable compound having at least one of an acrylate group and a methacrylate group (B) component: particles formed by bonding inorganic oxide particles and an organic compound containing a polymerizable unsaturated group The antiglare hard coat film according to claim 3, wherein the weight average particle diameter of the component (B) is 200 nm or less. 5. The component (B), wherein the inorganic oxide particles include at least one kind of particles selected from the group consisting of silicon oxide, titanium oxide, aluminum oxide, zinc oxide, tin oxide and zirconium oxide. The antiglare hard coat film described. In the said hard-coat layer forming material, the said (B) component is contained in the range of 100-200 weight part with respect to 100 weight part of said (A) component, It is any one of Claim 3 to 5 The antiglare hard coat film described. A spherical or irregular shape in which the difference in refractive index between the hard coat layer forming material and the fine particles is in the range of 0.01 to 0.04, and the fine particles have a weight average particle size in the range of 0.5 to 8 μm. 7 or more, and the fine particles are contained in a range of 3 to 10 parts by weight with respect to 100 parts by weight of the hard coat layer forming material. Antiglare hard coat film. The antiglare hard coat film according to any one of claims 1 to 7, wherein a thickness of the antiglare hard coat layer is in a range of 1.2 to 3 times a weight average particle diameter of the fine particles. The antiglare hard coat film according to any one of claims 1 to 8, wherein an antireflection layer is formed on the antiglare hard coat layer. A polarizing plate having a polarizer and an antiglare hard coat film, wherein the antiglare hard coat film is the antiglare hard coat film according to any one of claims 1 to 9. A polarizing plate. An image display device comprising an antiglare hard coat film or a polarizing plate, wherein the hard coat film is the antiglare hard coat film according to any one of claims 1 to 9, and the polarizing plate is claimed. Item 13. An image display device comprising the polarizing plate according to Item 10.

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