JP5592671B2 - Anti-glare hard coat film and polarizing plate using the same - Google Patents

Description

  The present invention relates to an antiglare hard coat film and a polarizing plate using the same. More specifically, the present invention relates to an anti-glare hard coat film having a hard coat layer formed using an active energy ray-sensitive composition containing metal oxide fine particles and a hard coat layer forming material containing organic fine particles. An anti-glare hard coat film capable of easily controlling the internal haze value of the hard coat layer by utilizing the specific gravity difference between the active energy ray-sensitive composition and the organic fine particles, and the anti-glare The present invention relates to a polarizing plate using a conductive hard coat film.

  In a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), or a plasma display (PDP), light may be incident on the screen from the outside, and this light may be reflected to make it difficult to see the displayed image. With the increase in size, it is becoming increasingly important to solve the above problems. One means for solving this problem is to use a member having an antiglare hard coat layer. The antiglare hard coat layer is formed by (1) a method of roughening the surface by a physical method at the time of curing for forming the hard coat layer, and (2) a hard coat agent for forming the hard coat layer. The method can be roughly divided into three types: a method of mixing a filler into the filler, and (3) a method of mixing incompatible two components into a hard coat agent for forming a hard coat layer and utilizing their phase separation. All of these have fine irregularities formed on the surface to suppress regular reflection of external light and prevent reflection of external light such as a fluorescent lamp. Among these, the method (2) of mixing a filler into the hard coat agent is the mainstream. As the filler, inorganic fine particles typified by silica were generally used. The reason why the silica particles are used includes that the whiteness of the obtained hard coat film can be kept low and that the scratch resistance is not lowered due to insufficient curing.

On the other hand, an antiglare film in which an antiglare layer composed of resin beads having a refractive index of 1.40 to 1.60 and an ionizing radiation curable composition is formed on a transparent substrate has been proposed. For example, Patent Document 1 proposes an antiglare film using an organic filler having a particle size equal to or greater than the thickness of the coating film in order to form unevenness that exhibits antiglare properties. When the unevenness is increased, there is a problem that the haze value increases and the transmission sharpness decreases. In order to improve it, Patent Document 2 reduces the amount of organic filler added having a particle size equal to or greater than the thickness of the coating film for forming irregularities that exhibits antiglare properties, and reduces the particle size equal to or less than the thickness of the coating film. It has been proposed to produce a well-balanced antiglare film by adding an organic filler.
However, in practice, even though the above-described method can balance the optical properties, due to the variation in the particle size of the fine particles used, there are spots where there are no irregularities, and anti-glare properties cannot be obtained on the entire surface. . In addition, there is a problem that stable productivity is inferior due to a large variation in the external haze value due to the film thickness. Further, in these systems, the film thickness is determined by the size of the fine particles, and it is difficult to adjust physical properties whose performance varies depending on the film thickness such as surface hardness.

JP-A-6-18706 Japanese Patent No. 3515401

  In order to cope with the problems of the above Patent Documents 1 and 2, the present inventors have intensively studied, and an active energy ray-sensitive composition and organic fine particles having a specific gravity difference with respect to the composition. It has been found that the above problem can be solved by forming a hard coat layer using the hard coat layer forming material contained and making its thickness larger than the particle size of the organic fine particles. An application was filed (Japanese Patent Application No. 2008-268192).

This technology is an excellent technology that can achieve a degree of antiglare and sufficient surface hardness, but it is difficult to avoid a phenomenon called “glare” depending on the type of fine particles used. I understood. Here, “glare” is a phenomenon that causes an apparent distortion in pixels due to lens effects based on the surface irregularities of the anti-glare film, resulting in luminance variations and resolution reduction. For example, flickering of the screen caused by interference between the LCD black matrix and the anti-glare film surface. To suppress this, it is effective to provide a light diffusion layer between the black matrix and the surface unevenness. is there. The degree of light diffusion depends on the internal haze value, and the internal haze can be expressed by introducing fine particles having a refractive index different from that of the active energy ray-sensitive composition. In order to increase the internal haze value, (1) the addition amount of the fine particles is increased, and (2) the refractive index difference between the fine particles and the active energy ray-sensitive composition is changed by changing the fine particles to be used. There are three possible points: (3) by changing the active energy ray-sensitive composition, and by changing the active energy ray-sensitive composition to one having a large refractive index difference between the fine particles and the active energy ray-sensitive composition. However, when the method (1) is used, defects due to the aggregation of the fine particles due to insufficient dispersion of the fine particles are likely to occur. When the method (2) is used, the selected fine particles have an active energy ray-sensitive composition. There is a case where the affinity with a product is not always good, and a defect due to poor dispersion often occurs.
The present invention has been made under such circumstances, and by using the technology of the above-mentioned Japanese Patent Application No. 2008-268192, sufficient anti-glare property and scratch resistance are achieved, and the above (3). It is an object of the present invention to provide an antiglare hard coat film capable of easily controlling the internal haze by using the method and a polarizing plate using the antiglare hard coat film.

As a result of intensive research to achieve the above object, the present inventors have formed an active energy ray-sensitive composition containing metal oxide fine particles and a hard coat layer forming material containing organic fine particles. The specific gravity of the active energy ray-sensitive composition is 0.25 or more larger than the specific gravity of the organic fine particles and the thickness of the hard coat layer is 25 ° C. It has been found that the object can be achieved by an antiglare hard coat film larger than the average particle diameter of the organic fine particles.
The present invention has been completed based on such findings.

That is, the present invention
[1] The surface of the transparent plastic film contains (A) (a-1) metal oxide fine particles, and (a-2) a polyfunctional (meth) acrylate monomer and / or (meth) acrylate prepolymer. An active energy ray-sensitive composition, and (B) a hard coat layer formed using a hard coat layer forming material containing organic fine particles, wherein (B) the organic fine particles have an average particle size of 2 to 5 μm; It consists of one kind, and at a temperature of 25 ° C., the specific gravity of the component (A) is 0.25 or more larger than the specific gravity of the component (B), and the difference in refractive index between the component (A) and the component (B) Is 0 to 0.5 (excluding 0), the hard coat layer has a thickness of 8 to 20 μm , and is larger than the average particle diameter of the organic fine particles (B). Dazzling hard coat film,
[2] (a-1) The antiglare hard coat film according to the above [1], wherein the metal oxide fine particles have a group containing a (meth) acryloyl group as a surface functional group,
[3] (a-1) The antiglare hard coat film according to the above [1] or [2], wherein the metal oxide fine particles are high refractive index fine particles,
[4] The antiglare hard coat as described in any one of [1] to [3] above, wherein the component (A) is an active energy ray-sensitive composition further comprising (a-3) silica fine particles. the film,
[5] (a-3) The antiglare hard coat film according to the above [4], wherein the silica fine particles have a group containing a (meth) acryloyl group as a surface functional group,
[6] The antiglare hard coat film according to any one of the above [1] to [5], wherein a low refractive index layer is further laminated on the hard coat layer,
[7] The antiglare hard coat film according to any one of [1] to [6] above, wherein an adhesive layer is laminated on the surface of the transparent plastic film on which the hard coat layer is not formed,
[8] The antiglare hard coat according to any one of the above [1] to [6], wherein another hard coat layer is laminated on the surface of the transparent plastic film where the hard coat layer is not formed. A polarizing plate formed by laminating a film and a surface opposite to the hard coat layer forming surface of the antiglare hard coat film according to any one of [9] and [9] above;
Is to provide.

The antiglare hard coat film of the present invention has the following effects.
(1) The specific gravity difference between (A) the active energy ray-sensitive composition contained in the hard coat layer formed on the surface of the transparent plastic film and (B) the organic fine particles is 0.25 or more at 25 ° C. Thus, the fine particles in the hard coat layer gather near the hard coat layer surface, and external haze (surface irregularities) can be generated even at a film thickness greater than the average particle size of the fine particles.
(2) The difference in refractive index between the component (A) and the component (B) is set to 0 to 0.5 (excluding 0), and (a-1) the metal oxide fine particles in (A) and (a- 2) The internal haze value can be easily controlled by controlling the component ratio with the polyfunctional (meth) acrylate monomer and / or (meth) acrylate prepolymer.

It is a perspective view which shows the structure of one example of a polarizing plate. It is a cross-sectional schematic diagram which shows the structure of one example of the polarizing plate of this invention.

In the antiglare hard coat film of the present invention, a hard coat layer forming material having the following composition is used for forming a hard coat layer provided on at least one surface of a transparent plastic film.
[Hard coat layer forming material]
The hard coat layer forming material in the present invention includes (A) (a-1) metal oxide fine particles, and (a-2) a polyfunctional (meth) acrylate monomer and / or (meth) acrylate prepolymer. It contains an active energy ray sensitive composition and (B) organic fine particles.

((A) Active energy ray sensitive composition)
In the hard coat layer forming material, the active energy ray-sensitive composition used as the component (A) includes (a-1) metal oxide fine particles, and (a-2) a polyfunctional (meth) acrylate monomer and It contains a (meth) acrylate-based prepolymer and (a-3) silica fine particles as required.
In the present invention, the active energy ray refers to an electromagnetic wave or a charged particle beam having an energy quantum, that is, an ultraviolet ray or an electron beam.

<(A-1) Metal oxide fine particles>
In the present invention, metal oxide fine particles are used as the component (a-1) of the active energy ray sensitive composition (A).
The metal oxide fine particles in the present invention are rich in malleability and ductility, are good electrical and thermal conductors, and have an element with metallic luster, that is, in the periodic table (long period type), boron (B), silicon (Si), It refers to oxide fine particles of elements located to the left of the diagonal line connecting arsenic (As), tellurium (Te) and astatine (At). Further, oxide fine particles of an element located on the right side of the alkaline earth metal (Group 2) in the periodic table are preferable.
As such metal oxide fine particles, those having high refractive index, preferably fine particles having a refractive index of 1.6 or more are suitable from the viewpoint of preventing glare. As the high refractive index metal oxide fine particles, ZnO (refractive index 1.90), TiO ₂ (refractive index 2.3 to 2.7), CeO ₂ (refractive index 1.95), Sb ₂ O ₅ (refractive index). 1.71), SnO ₂ (refractive index 2.00), indium-doped tin oxide (ITO; refractive index 1.95), phosphorus-doped tin oxide (PTO; refractive index 1.75 to 1.85), Y ₂ O ₃ (refractive index 1.87), La ₂ O ₃ (refractive index 1.95), ZrO ₂ (refractive index 2.05), Al ₂ O ₃ (refractive index 1.63) and the like can be exemplified. These metal oxide fine particles may be used individually by 1 type, and may be used in combination of 2 or more type.
These high refractive index metal oxide fine particles all have a high specific gravity and contribute to making the specific gravity of the component (A) 0.25 or more higher than the specific gravity of the component (B) at a temperature of 25 ° C. can do.

（式中、Ｒ¹は水素原子又はメチル基、Ｒ²はハロゲン原子又は

で示される基である。）
で表される化合物などが好ましく用いられる。 The (a-1) metal oxide fine particles are preferably fine particles having a group containing a (meth) acryloyl group as a surface functional group (hereinafter sometimes referred to as reactive metal oxide fine particles). The metal oxide fine particles having such a surface functional group have an effect of improving the scratch resistance of the hard coat layer by being crosslinked and cured by irradiation with active energy rays as an active energy ray curing component.
In the reactive metal oxide fine particle, for example, a (meth) acryloyl group-containing organic compound capable of reacting with the hydroxy group is reacted with a hydroxy group present on the surface of the metal oxide fine particle having an average particle diameter of about 0.005 to 1 μm. Can be obtained.
Examples of the (meth) acryloyl group-containing organic compound that can react with the hydroxy group include, for example, the general formula (I)

(Wherein R ¹ is a hydrogen atom or a methyl group, R ² is a halogen atom or

It is group shown by these. )
A compound represented by the formula is preferably used.

Examples of such compounds include acrylic acid, acrylic acid chloride, 2-isocyanatoethyl acrylate, glycidyl acrylate, 2,3-iminopropyl acrylate, 2-hydroxyethyl acrylate, acryloyloxypropyltrimethoxysilane, and the like. And methacrylic acid derivatives corresponding to these acrylic acid derivatives can be used. These acrylic acid derivatives and methacrylic acid derivatives may be used alone or in combination of two or more.
In the present invention, the content of the metal oxide fine particles of the component (a-1) is usually about 5 to 80% by mass, preferably 10 in the solid content of the active energy ray sensitive composition of the component (A). -70 mass%.
In addition, the average particle diameter of the metal oxide fine particles of the component (a-1) can be measured by a laser diffraction / scattering method. In this method, the average particle diameter is measured by a change in intensity of light that is diffracted and scattered when laser light is applied to a liquid in which particles are dispersed.

<(A-2) Multifunctional (meth) acrylate monomer and / or (meth) acrylate prepolymer>
In the present invention, a polyfunctional (meth) acrylate monomer and / or (meth) acrylate prepolymer is used as the component (a-2) in the active energy ray-sensitive composition (A).
Examples of the polyfunctional (meth) acrylate monomer include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol diester. (Meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified di (meth) acrylate phosphoric acid, allylation Cyclohexyl di (meth) acrylate, isocyanurate di (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate Pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) acrylate, tris (acryloxyethyl) isocyanurate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, Examples thereof include polyfunctional (meth) acrylates such as caprolactone-modified dipentaerythritol hexa (meth) acrylate. These monomers may be used alone or in combination of two or more.

On the other hand, examples of the (meth) acrylate prepolymer include polyester acrylate, epoxy acrylate, urethane acrylate, and polyol acrylate. Here, as the polyester acrylate-based prepolymer, for example, by esterifying the hydroxyl group of a polyester oligomer having a hydroxyl group at both ends obtained by condensation of a polyvalent carboxylic acid and a polyhydric alcohol with (meth) acrylic acid, or It can be obtained by esterifying the terminal hydroxyl group of an oligomer obtained by adding an alkylene oxide to a polyvalent carboxylic acid with (meth) acrylic acid.
The epoxy acrylate prepolymer can be obtained, for example, by reacting (meth) acrylic acid with an oxirane ring of a relatively low molecular weight bisphenol type epoxy resin or novolak type epoxy resin and esterifying it. The urethane acrylate-based prepolymer can be obtained, for example, by esterifying a polyurethane oligomer obtained by reaction of polyether polyol or polyester polyol and polyisocyanate with (meth) acrylic acid. Furthermore, the polyol acrylate-based prepolymer can be obtained by esterifying the hydroxyl group of the polyether polyol with (meth) acrylic acid. These prepolymers may be used singly or in combination of two or more, or may be used in combination with the polyfunctional (meth) acrylate monomer.

<(A-3) Silica fine particles>
In the present invention, if necessary, (a-3) silica fine particles, for example, colloidal silica fine particles and / or silica fine particles having surface functional groups can be used.
The colloidal silica fine particles have an average particle diameter of about 1 to 400 nm, and the silica fine particles having a surface functional group include, for example, silica fine particles having a group containing a (meth) acryloyl group as the surface functional group (hereinafter referred to as a “surface functional group”). May be referred to as reactive silica fine particles.).
The reactive silica fine particles can be obtained, for example, by reacting a silanol group on the surface of silica fine particles having an average particle diameter of about 0.005 to 1 μm with a (meth) acryloyl group-containing organic compound that can react with the silanol group. Can do. The (meth) acryloyl group-containing organic compound is as described in the above-described metal oxide fine particles.
The silica fine particles to which the (meth) acryloyl group-containing organic compound thus obtained is bonded are crosslinked and cured by irradiation with active energy rays as an active energy ray curing component.
The reactive silica fine particles have an effect of improving the scratch resistance of the obtained hard coat film.
As an active energy ray-sensitive composition (A) containing a compound formed by bonding an organic compound having a (meth) acryloyl group to such silica fine particles, for example, trade names “OPSTAR Z7530” manufactured by JSR Corporation, “ "OPSTAR Z7524", "OPSTAR TU4086", etc. are on the market.
In the present invention, the content of the silica fine particles of the component (a-3) used as necessary is usually 5 to 80% by mass in the solid content of the active energy ray-sensitive composition of the component (A). The degree, preferably 10 to 70% by mass.
In addition, the average particle diameter of the silica fine particles of the component (a-3) can be measured by a laser diffraction / scattering method.

((B) Organic fine particles)
In the hard coat layer forming material of the present invention, the organic fine particles used as the component (B) include, for example, silicone fine particles, melamine resin fine particles, acrylic resin fine particles (for example, polymethyl methacrylate fine particles (hereinafter referred to as PMMA fine particles). And acryl-styrene copolymer fine particles, polycarbonate fine particles, polyethylene fine particles, polystyrene fine particles, benzoguanamine resin fine particles, and the like. Further, the shape of the organic fine particles used in the present invention is not limited at all, but from the viewpoint of improving the reproducibility of the antiglare performance, a spherical one is preferable because the light scattering state is homogenized. Further, from the same viewpoint, the organic fine particles having a narrow particle size distribution are particularly preferable. The average particle diameter of the organic fine particles is preferably 1 to 10 μm, particularly preferably 2 to 5 μm from the viewpoint of antiglare performance, and from the same viewpoint, the particle size distribution is measured by a Coulter counter method. It is preferable that the mass fraction of the particle size of ± 50% or more of the particle size of the peak top value is 70% or more of the whole.
In the present invention, the organic fine particles of the component (B) may be used singly or in combination of two or more, and the blending amount is from the viewpoint of antiglare performance, Preferably it is 0.1-30 mass parts with respect to 100 mass parts of solid content of the active energy ray sensitive composition which is the (A) component mentioned above, More preferably, it is 1-20 mass parts.
Further, the difference between the refractive index of the cured product of the active energy ray-sensitive composition and the refractive index of the organic fine particles is 0 to 0.5 (excluding 0) in absolute value from the viewpoint of internal haze expression. It is preferable that it is 0.01-0.2. Furthermore, the refractive index difference is particularly preferably 0.05 to 0.10 from the viewpoint of achieving both high glare prevention properties and contrast.

In the present invention, in order to improve the antiglare performance by distributing the organic fine particles of the component (B) in the vicinity of the surface of the hard coat layer, the active energy ray sensitive type of the component (A) at a temperature of 25 ° C. The specific gravity of the composition needs to be 0.25 or more larger than the specific gravity of the organic fine particles of the component (B). If this specific gravity difference is less than 0.25, the proportion of the organic fine particles present in the vicinity of the surface of the hard coat layer becomes low, and the desired antiglare performance cannot be obtained. The specific gravity difference is preferably 0.30 or more, more preferably 0.40 or more. On the other hand, if the specific gravity difference is too large, the amount of organic fine particles present in the vicinity of the surface of the hard coat layer becomes excessive, which may reduce the contrast. Therefore, the specific gravity difference is preferably 1.5 or less, more preferably 1.0 or less, and even more preferably 0.70 or less.
The specific gravity of the active energy ray-sensitive composition (A) at a temperature of 25 ° C. is the value before curing by energy ray irradiation, and is a value measured according to the specific gravity measurement method using a specific gravity bottle of JIS Z 8804. It is. The specific gravity of the active energy ray sensitive composition refers to the specific gravity in solid content. The specific gravity of (B) organic fine particles at a temperature of 25 ° C. is a value measured according to a specific gravity measurement method using a specific gravity bottle of JIS Z 8807-1976.

(Photopolymerization initiator)
The hard coat layer forming material in the present invention may contain a photopolymerization initiator as desired. Examples of this photopolymerization initiator include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl]- 2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4′-diethylaminobenzophenone Dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4 -Diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoate, and the like.
These may be used alone or in combination of two or more, and the blending amount is usually 0.2 to 10 parts by mass with respect to 100 parts by mass of the total active energy ray-sensitive compound. Is selected within the range. Here, the total active energy ray-sensitive compound means (a-1) when reactive metal oxide fine particles are used as metal oxide fine particles, or (a-3) reactive silica fine particles as silica fine particles. When used, it represents those containing them.

(Preparation of hard coat layer forming material)
The hard coat layer forming material used in the present invention may contain the above-described active energy ray-sensitive composition of component (A), organic fine particles of component (B), and light used as desired in an appropriate solvent as necessary. By adding a polymerization initiator and various additive components, for example, an antioxidant, an ultraviolet absorber, a silane coupling agent, a light stabilizer, a leveling agent, an antifoaming agent, and the like at a predetermined ratio, and dissolving or dispersing them, Can be prepared.
Examples of the solvent used here include aliphatic hydrocarbons such as hexane and heptane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and ethylene chloride, methanol, ethanol, propanol, butanol, and propylene glycol. Examples include alcohols such as monomethyl ether, ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone, and cyclohexanone, esters such as ethyl acetate and butyl acetate, and cellosolv solvents such as ethyl cellosolve.
The concentration and viscosity of the hard coat layer forming material thus prepared are not particularly limited as long as they can be coated, and can be appropriately adjusted according to the situation.

[Transparent plastic film]
In the antiglare hard coat film of the present invention, a hard coat layer is formed on at least one surface of the transparent plastic film using the hard coat layer forming material prepared as described above.
There is no restriction | limiting in particular about the said transparent plastic film, It can select suitably from well-known plastic films as a base material of the hard coat film for conventional optics. Examples of such plastic films include polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyethylene films, polypropylene films, cellophane, diacetyl cellulose films, triacetyl cellulose films, acetyl cellulose butyrate films, and polychlorinated. Vinyl film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyether ether ketone film, polyether sulfone film, polyetherimide film , Polyimide film, fluororesin film, Li amide film, acrylic resin film, norbornene resin film, a plastic film such as a cycloolefin resin film.

These plastic films may be transparent or translucent, may be colored, or may be uncolored, and may be appropriately selected depending on the application. For example, when used for protecting a liquid crystal display, a colorless and transparent film is suitable.
The thickness of these plastic films is not particularly limited and is appropriately selected depending on the situation, but is usually in the range of 15 to 300 μm, preferably 30 to 200 μm. Moreover, this plastic film can be surface-treated by an oxidation method, an uneven | corrugated method, etc. on one side or both surfaces as needed for the purpose of improving the adhesiveness with the layer provided in the surface. Examples of the oxidation method include corona discharge treatment, plasma treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment, and examples of the unevenness method include a sand blast method, a solvent, and the like. Treatment methods and the like. These surface treatment methods are appropriately selected according to the type of the plastic film, but in general, the corona discharge treatment method is preferably used from the viewpoints of effects and operability. A primer layer can also be provided.

[Formation of hard coat layer]
The hard coat layer forming material is formed on at least one surface of the transparent plastic film by using a conventionally known method such as a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, or a gravure coating method. A hard coat layer is formed by coating to form a coating film, drying, and then irradiating this with active energy rays to cure the coating film.
Examples of the active energy rays include ultraviolet rays and electron beams. The ultraviolet rays are obtained with a high-pressure mercury lamp, an electrodeless lamp, a metal halide lamp, a xenon lamp or the like, and the irradiation amount is usually 100 to 500 mJ / cm ² , while the electron beam is obtained with an electron beam accelerator or the like. The amount is usually 150 to 350 kV. Among these active energy rays, ultraviolet rays are particularly preferable. In addition, when using an electron beam, a cured film can be obtained, without adding a photoinitiator.
In the present invention, the thickness of the hard coat layer thus formed needs to be larger than the average particle diameter of the organic fine particles used. Therefore, the lower limit is about 2 μm, and the upper limit is the hard coat layer. From the viewpoint of preventing the hard coat film from curling due to curing shrinkage of the film, it is about 20 μm. A preferable thickness is in the range of 5 to 15 μm, and a particularly preferable thickness is 8 to 12 μm.

[Anti-glare hard coat film]
(optical properties)
The optical properties of the antiglare hard coat film of the present invention thus formed are as follows.
The internal haze value is usually 1 to 80%, preferably 3 to 60%, particularly preferably 15 to 50%. This is because if the internal haze value is too small, the anti-glare property may not be exhibited, whereas if the internal haze value is too large, the contrast may decrease. The external haze value is usually 0.5 to 30%, preferably 1 to 7%, particularly preferably 1 to 4%. This is because if the external haze value is in the above range, both contrast and antiglare properties can be achieved.
The external haze value is a value obtained by measuring the total haze value and the internal haze value of the antiglare hard coat film and obtaining the difference between the total haze value and the internal haze value.
Further, the 60 ° specular gloss is preferably 15 to 130, more preferably 20 to 120, and particularly preferably 85 to 115. When the 60 ° specular glossiness exceeds 130, the surface glossiness is large (the reflection of light is large), and the antiglare property is adversely affected. If the 60 ° specular gloss is less than 15, it is likely to cause whitening. The total light transmittance of the antiglare hard coat film is usually 85% or more, preferably 88% or more, and more preferably 90% or more. If the total light transmittance is less than 85%, the transparency may be insufficient.
The method for measuring the optical characteristic value will be described later.

(Other functional layers)
In the antiglare hard coat film of the present invention, a low refractive index layer, for example, a siloxane-based film, a fluorine-based film, or the like can be provided on the hard coat layer for the purpose of imparting antireflection properties, if necessary. . In this case, the thickness of the low refractive index layer is suitably about 0.05 to 1 μm. By providing this low-refractive-index layer, screen reflections caused by reflections from sunlight, fluorescent lights, etc. are eliminated, and by suppressing the surface reflectance, the total light transmittance is increased and transparency is improved. To do. Depending on the type of the low refractive index layer, the antistatic property can be improved.

(Adhesive layer)
In the antiglare hard coat film of the present invention, an adhesive layer for adhering to an adherend such as a liquid crystal display can be formed on the surface of the plastic film opposite to the hard coat layer. As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, for example, an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, and a silicone pressure-sensitive adhesive suitable for optical applications are preferably used. The thickness of this pressure-sensitive adhesive layer is usually 5 to 100 μm, preferably 10 to 60 μm.
Furthermore, a release sheet can be provided on the pressure-sensitive adhesive layer as necessary. Examples of the release sheet include those obtained by applying a release agent such as a silicone resin to various plastic films such as polyethylene terephthalate and polypropylene. Although there is no restriction | limiting in particular about the thickness of this peeling sheet, Usually, it is about 20-150 micrometers.
The antiglare hard coat film formed with such an adhesive layer is suitably used as a member that imparts antiglare performance, scratch resistance, etc. to displays such as CRT, LCD, PDP, etc. It is suitable for polarizing plate application.

  In the antiglare hard coat film of the present invention, if necessary, another hard coat layer can be laminated on the surface of the transparent plastic film where the hard coat layer is not formed. Both hard coat layers may have the same or different hard coat layer forming materials.

[Polarizer]
This invention also provides the polarizing plate formed by bonding the surface on the opposite side of the hard-coat layer formation surface of the anti-glare hard coat film of this invention mentioned above to a polarizer.
In a liquid crystal cell in an LCD, generally, two transparent electrode substrates on which an alignment layer is formed are arranged so that the alignment layer is on the inside so as to form a predetermined gap by a spacer, the periphery is sealed, and a liquid crystal material is placed in the gap. And a polarizing plate is disposed on the outer surface of each of the two transparent electrode substrates via an adhesive layer.
FIG. 1 is a perspective view showing a configuration of an example of the polarizing plate. As shown in this figure, the polarizing plate 10 is generally a base material having a three-layer structure in which triacetyl cellulose (TAC) films 2 and 2 ′ are bonded to both surfaces of a polyvinyl alcohol polarizer 1. And the adhesive layer 3 for adhering to optical components, such as a liquid crystal cell, is formed in the single side | surface, Furthermore, the peeling sheet 4 is affixed on this adhesive layer 3 Yes. Moreover, the surface protective film 5 is normally provided in the surface on the opposite side to this adhesive layer 3 of this polarizing plate.
The polarizing plate of the present invention is such that one of the TAC films 2 and 2 ′ provided on both surfaces of the polarizer 1 is provided with the above-described hard coat layer according to the present invention. When the pressure-sensitive adhesive layer 3, the release sheet 4, and the surface protective film 5 are provided on the polarizing plate, the hard coat layer according to the present invention is provided particularly on the TAC film 2 ′ side on the surface protective film 5 side.

As a method for producing the polarizing plate of the present invention, for example, the following operations can be performed.
FIG. 2 is a schematic cross-sectional view showing the configuration of one example of the polarizing plate of the present invention.
First, a film 12 ′ having no optical anisotropy such as a TAC film is used as a transparent plastic film of a base material, and a hard coat layer 13 according to the present invention is formed on one surface thereof, and an antiglare hard coat film 14 is formed. And Next, the TAC film 12 in which the hard coat layer 13 is not formed on one surface of the polarizer 11 and the antiglare hard coat film 14 on the opposite surface are laminated using the adhesive layers 15 and 15 ′. When a TAC film is used for the transparent plastic film, saponification treatment can be performed in addition to the surface treatment described above in order to improve adhesion by lamination with an adhesive.
Thereby, the polarizing plate 20 excellent in anti-glare performance and abrasion resistance performance is obtained. If necessary, the polarizing plate 20 is also provided with a peelable surface protective film 5 shown in FIG. 1 on the surface on which the hard coat layer 13 is provided, and an adhesive for attaching to an optical component such as a liquid crystal cell on the opposite surface. A layer 16 or a release sheet 17 may be provided.
The polarizing plate of the present invention can be used not only for liquid crystal cells in LCDs but also for light amount adjustment, polarization interference application devices, optical defect detectors, and the like.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
The average particle diameter, specific gravity and refractive index of the organic fine particles, the specific gravity of the active energy ray-sensitive composition, the refractive index of the cured product of the composition, and the performance of the hard coat film were determined according to the following methods.
<Organic fine particles>
(1) Average particle diameter It measured by the Coulter counter method.
(2) Specific gravity at a temperature of 25 ° C. The specific gravity was measured by a specific gravity measurement method using a specific gravity bottle of JIS Z 8807-1976.
(3) Refractive index An organic fine particle to be measured was placed on a slide glass, a refractive index standard solution was dropped on the fine particle, and then a cover glass was placed over to prepare a sample. The sample was observed with a microscope based on the method B of JIS K 7142, and the refractive index of the refractive index standard solution in which the outline of the fine particles was most difficult to see was taken as the refractive index of the fine particles.

<Active energy ray sensitive composition>
(4) Specific gravity at a temperature of 25 ° C. The active energy ray-sensitive composition before active energy ray irradiation was measured by a specific gravity measurement method using a specific gravity bottle of JIS Z 8804. When the active energy ray-sensitive composition is diluted with a solvent or the like, the specific gravity of the diluted active energy ray-sensitive composition is measured by the measurement method, and the diluted solvent content is removed by calculation. The specific gravity of the solid content of the energy ray sensitive composition was calculated.
For example, the specific gravity of the solid content of the active energy ray-sensitive composition is A, the specific gravity of the dilution solvent B is b, and the blending ratio of the dilution solvent B in the diluted active energy ray-sensitive composition is y × 100 (%). And the specific gravity of the diluted active energy ray sensitive composition is z × 100 (%), and the specific gravity of the diluted active energy ray sensitive composition is z × 100 (%). In the case of D, the specific gravity A of the solid content of the active energy ray-sensitive composition can be calculated by the following formula.
A = (D−b × y−c × z) / (1−yz)
Moreover, when the active energy ray-sensitive composition was a blend of two or more types of active energy ray-sensitive compositions, it was calculated by multiplying the specific gravity of each solid content by the blending ratio and summing.
(5) Refractive index of cured product of active energy ray-sensitive composition In each preparation example, a coating agent comprising an active energy ray-sensitive composition, a photopolymerization initiator and a diluent solvent is prepared. This was applied to a TAC film [Fuji Film Co., Ltd.] or PET film [Toyobo Co., Ltd.] in the same manner as in the Examples, cured by ultraviolet irradiation, and a hard coat film for measuring the refractive index of the cured product. It was. The refractive index of the hard coat layer was determined using an Abbe refractometer manufactured by Atago Co., Ltd. based on the method A of JIS K 7142, and this was used as the refractive index of the cured product of the active energy ray sensitive composition.

<Hard coat film>
(6) Total light transmittance Total light transmittance of the antiglare hard coat film produced in each example using a haze meter “NDH-2000” manufactured by Nippon Denshoku Industries Co., Ltd. according to JIS K 7361-1. The rate was measured.
(7) Internal haze value, total haze value, and external haze value of hard coat layer Using a Nippon Denshoku Industries Co., Ltd. haze meter “NDH-2000”, each sample was prepared in accordance with JIS K 7136. The haze values of the antiglare hard coat film and the transparent plastic film alone as a constituent member of the film were measured.
The total haze value of the hard coat layer of the antiglare hard coat film was calculated by subtracting the haze value of the transparent plastic film from the haze value of the antiglare hard coat film obtained by the measurement.
Next, 100 parts by mass of an acrylic pressure-sensitive adhesive [manufactured by Nippon Carbide, trade name “PE-121”], 2 parts by weight of an isocyanate cross-linking agent [trade name “BHS-8515”, manufactured by Toyo Ink Co., Ltd.] 100 parts by mass of toluene was added to prepare an adhesive solution.
Next, an adhesive solution was applied to a polyethylene terephthalate film [manufactured by Toyobo Co., Ltd.] as a transparent film having a thickness of 50 μm so that the thickness of the adhesive layer after drying was 20 μm, and dried at 100 ° C. for 3 minutes. A transparent adhesive sheet was prepared.
The produced transparent adhesive sheet was affixed on the hard coat layer side of the antiglare hard coat film to obtain a sample for calculating an internal haze value. The haze value of each of the transparent adhesive sheet and the sample for calculating the internal haze value was measured according to JIS K 7136 as described above.
Then, the internal haze value of the hard coat layer of the antiglare hard coat film was calculated by subtracting the haze value of the transparent adhesive sheet and the haze value of the transparent plastic film from the haze value of the sample for calculating the internal haze value.
Finally, the external haze value of the hard coat layer of the antiglare hard coat film was calculated by subtracting the internal haze value from the total haze value.

(8) Evaluation of antiglare property A sample in which a hard coat film is attached to an acrylic resin blackboard [manufactured by Mitsubishi Rayon Co., Ltd.] via an acrylic adhesive is visually observed under a fluorescent lamp, and the following criteria are used. Antiglare property was evaluated.
A: Insufficient prevention of reflection of fluorescent lamp.
B: The reflection of the fluorescent lamp is sufficient, and it is not whitened.
C: The fluorescent lamp has sufficient anti-reflection properties but is whitened.
(9) 60 ° specular gloss The glossiness “VG2000” manufactured by Nippon Denshoku Industries Co., Ltd. was used and measured according to JIS K 7105.
(10) Anti-glare property A polarizing plate produced using the anti-glare hard coat film obtained in each example was placed on the surface of the liquid crystal display “AQUAS LC-20AX5” manufactured by Sharp. The brightness flicker was observed visually. The polarizing plate is composed of a polarizer obtained by adsorbing iodine to stretched polyvinyl alcohol, and the antiglare hard coat film on one side and a triacetyl cellulose (hereinafter “TAC”) film [Konica Minolta Opto, Inc. on the other side. ), Product name “KC8UX2M”].
A: There is no luminance flicker.
○: There is a slight flicker in luminance, but there is no practical problem.
(Triangle | delta): There exists some flickering of brightness | luminance and there exists a problem practically.
X: There are many flickers of brightness, and it is unacceptable.
(11) Pencil hardness Based on JIS K 5400, it measured using the pencil scratch coating-film hardness tester "No553-M1" of Yasuda Seiki Seisakusho.
(12) Taber Friction Hardness Test Measured according to JIS K 5600-5-9, and a change in haze value (Δ haze) before and after the test was determined. The smaller the value, the higher the surface hardness.
Measurement conditions: CS-10F friction wheel, 4.9N load, 100 rotations (13) Hard coat layer thickness Antiglare hard coat film prepared in each example, transparent used for preparation of the antiglare hard coat film About each of the plastic film TAC (triacetylcellulose) film and PET (polyethylene terephthalate) film, the thickness was measured with a constant pressure thickness meter [trade name “MH-15M” manufactured by Nikon Corporation], and the difference was determined. The thickness of the hard coat layer was calculated by taking it.
(14) Coating unevenness The surface of the hard coat layer was visually observed and coating unevenness was evaluated according to the following criteria.
○: The entire coated surface looks uniform.
X: A part with high anti-glare property and a part with low anti-glare property are mixed on the coated surface, and it appears uneven as a whole.
(15) Contrast Using the display with a polarizing plate by the antiglare hard coat film of each example used in the evaluation of (10) above, visually observe the difference in brightness (contrast) when displaying black and white in a dark room. Was evaluated according to the following criteria.
◎: Contrast is very high ○: Contrast is high △: Contrast is slightly low ×: Contrast is low

Preparation Example 1 Hard Coating Layer Coating Agent 1
(A) As an active energy ray-sensitive composition, a hard coating agent containing reactive zirconium fine particles [manufactured by JSR Corporation, trade name “OPSTAR KZ6661”, solid content concentration 50 mass%, reactive zirconium fine particles and polyfunctionality 45% by mass of all active energy ray-curable compound containing (meth) acrylate monomer and (meth) acrylate prepolymer, 5% by mass of photoinitiator, 50% by mass of methyl isobutyl ketone (MIBK), specific gravity of solid content 2 .29, refractive index of cured product 1.65] 100 parts by mass, (B) 6 parts by mass of PMMA fine particles [manufactured by Soken Chemical Co., Ltd., average particle size 5 μm] as spherical organic fine particles, propylene glycol monomethyl ether as diluent solvent 33 parts by mass was uniformly mixed to prepare a hard coat layer coating agent 1 having a solid content of about 40% by mass.

Preparation Example 2 Hard Coating Layer Coating Agent 2
(A) Hard coating agent containing 70 parts by mass of KZ6661 of Preparation Example 1 as an active energy ray-sensitive composition and an active energy ray-sensitive composition containing no reactive fine particles [manufactured by Dainichi Seika Kogyo Co., Ltd., Product name “SEICA BEAM EXF-L203 (CS-1)”, solid content concentration 70% by mass, active energy ray-sensitive composition composed of polyfunctional (meth) acrylate monomer and (meth) acrylate prepolymer 65% by mass , Photoinitiator 5% by mass, propylene glycol monomethyl ether 30% by mass, solids specific gravity 1.33, cured product refractive index 1.52] The coating agent 2 for hard-coat layers which is about 40 mass% was prepared.

Preparation Example 3 Hard Coating Layer Coating Agent 3
(A) As an active energy ray sensitive composition, the solid content was about the same as in Preparation Example 2 except that 42 parts by mass of KZ6661 of Preparation Example 1 and 70 parts by mass of L203 (CS-1) (supra) were added. The coating agent 3 for hard-coat layers which is 40 mass% was prepared.

Preparation Example 4 Coating agent 4 for hard coat layer
(A) Hard coating agent containing 14.6 parts by mass of KZ6661 of Preparation Example 1 and reactive silica fine particles as an active energy ray-sensitive composition [trade name “OPSTAR Z7530” manufactured by JSR Corporation, solid content concentration 73 70% by mass of a total active energy ray-curable compound containing reactive silica fine particles, polyfunctional (meth) acrylate monomer and (meth) acrylate prepolymer, 3% by mass of photoinitiator, 27% by mass of methyl ethyl ketone A hard coating layer coating agent 4 having a solid content of about 40% by mass was prepared in the same manner as in Preparation Example 2, except that 90 parts by mass of a specific gravity of 1.65 and a refractive index of a cured product of 1.49] were added. did.

Preparation Example 5 Hard coat layer coating agent 5
(A) Hard coating agent containing phosphorus-doped tin oxide fine particles that are not reactive as an active energy ray-sensitive composition [trade name “Rioduras TYP65-04” manufactured by Toyo Ink Co., Ltd.], solid content concentration 35% by mass, reactivity Non-phosphorus-doped tin oxide fine particles, polyfunctional (meth) acrylate monomer and (meth) acrylate prepolymer 42% by mass, photoinitiator 3% by mass, MIBK / propylene glycol monomethyl ether / 65% by mass of mixed solvent of cyclohexanone, specific gravity of 1.75, refractive index 1.65 of cured product, 100 parts by mass of (B) spherical organic fine particles, PMMA fine particles [manufactured by Soken Chemical Co., Ltd., average particle size 3 μm] 2 parts by mass were uniformly mixed to prepare hard coat layer coating agent 5 having a solid content of about 36% by mass.

Preparation Example 6 Coating agent 6 for hard coat layer
(A) Hard coating agent containing titanium dioxide that is not reactive as an active energy ray-sensitive composition [manufactured by Toyo Ink Co., Ltd., trade name “Rioduras TYT80-01”], solid content concentration 25% by mass, non-reactive dioxide Total active energy ray curable compound containing titanium, polyfunctional (meth) acrylate monomer and (meth) acrylate prepolymer 22% by mass, photoinitiator 3% by mass, MIBK / propylene glycol monomethyl ether / cyclohexanone mixed solvent 75% by mass, specific gravity of solid content 2.10, refractive index 1.80 of cured product 100 parts by mass, (B) spherical organic fine particles, PMMA fine particles [manufactured by Soken Chemical Co., Ltd., average particle size 3 μm] 2 masses Parts were uniformly mixed to prepare hard coat layer coating agent 6 having a solid content of about 26% by mass.

Preparation Example 7 Coating agent 7 for antireflection layer
As an active energy ray curable compound, ultraviolet (UV) curable hard coat agent [manufactured by Arakawa Chemical Co., Ltd., trade name “Beam Set 575CB”, solid content 100%] 100 parts by mass, porous silica particles of methyl isobutyl ketone (MIBK) dispersion [manufactured by Catalyst Kasei Kogyo Co., Ltd., trade name [ELCOM RT-1002SIV], solid content 21% by mass, porous silica particles, refractive index of cured product 1.30, average particle size 60 nm] 80 mass After mixing the parts, the coating composition 7 for antireflection layer was prepared by diluting with MIBK so that the total solid content concentration was 2% by mass.

Preparation Example 8 Coating agent 8 for pressure-sensitive adhesive layer
100 parts by mass of an acrylic copolymer (weight average molecular weight Mw: 800,000) of butyl acrylate / methyl acrylate / acrylic acid (mass ratio 77/20/3) and an ultraviolet curable polyfunctional acrylate [Toa Gosei Co., Ltd. Product name “Aronix M-315”, tris (acryloxyethyl) isocyanurate, molecular weight: 578] 25 parts by mass, photoinitiator [Ciba Specialty Chemicals, trade name “Irgacure 500”, benzophenone 1 part by weight of 1-hydroxycyclohexyl phenyl ketone mixture in 1: 1 ratio] and an isocyanate-based crosslinking agent [manufactured by Nippon Polyurethane Co., Ltd., trade name “Coronate L”, trimethylolpropane modified tolylene diisocyanate] 2 mass parts was mixed and the coating agent 8 for adhesive layers was prepared.

Preparation Example 9 Coating agent 9 for hard coat layer
As an active energy ray curable compound, an ultraviolet (UV) curable hard coat agent [manufactured by Arakawa Chemical Co., Ltd., trade name “Beam Set 575CB”, solid content 100%] 100 parts by mass, propylene glycol monomethyl acetate 30% by mass, Specific gravity 1.33] A coating agent 9 for hard coat layer having a solid content of about 40% by mass was prepared in the same manner as Preparation Example 1 except that 50 parts by mass was added.

Preparation Example 10 Hard coat layer coating agent 10
A hard coat layer coating agent 10 having a solid content of about 40% by mass in the same manner as in Preparation Example 1 except that 100 parts by mass of L203 (CS-1) (supra) was added as an active energy ray-curable compound. Prepared.

Preparation Example 11 Coat Agent 11 for Hard Coat Layer
A hard coat layer coating agent 11 having a solid content of about 40% by mass was prepared in the same manner as in Preparation Example 1, except that 100 parts by mass of Z7530 (supra) was added as the active energy ray-curable compound.

Example 1
The hard coat layer coating agent 1 obtained in Preparation Example 1 was applied to the surface of a TAC film having a thickness of 80 μm [manufactured by Fuji Film Co., Ltd.] with a Mayer bar so that the cured film thickness was about 10 μm. After drying in an oven at 70 ° C. for 1 minute, an optical film was produced by irradiating 300 mJ / cm ² of ultraviolet rays with a high-pressure mercury lamp.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Example 2
An optical film was produced in the same manner as in Example 1 except that a 100 μm thick PET film [manufactured by Toyobo Co., Ltd.] was used as the transparent substrate film.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Example 3
An optical film was produced in the same manner as in Example 1 except that the coating agent 2 obtained in Preparation Example 2 was coated with a Mayer bar so that the cured film thickness was about 10 μm.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Example 4
An optical film was produced in the same manner as in Example 1 except that the coating agent 3 obtained in Preparation Example 3 was coated with a Mayer bar so that the cured film thickness was about 10 μm.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Example 5
An optical film was produced in the same manner as in Example 1 except that the coating agent 4 obtained in Preparation Example 4 was coated with a Mayer bar so that the cured film thickness was about 10 μm.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Example 6
An optical film was produced in the same manner as in Example 1 except that the coating agent 5 obtained in Preparation Example 5 was coated with a Mayer bar so that the cured film thickness was about 8 μm.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Example 7
An optical film was produced in the same manner as in Example 1 except that the coating agent 6 obtained in Preparation Example 6 was coated with a Mayer bar so that the cured film thickness was about 6 μm.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Example 8
On the hard coat layer formed in Example 1, the anti-reflection layer coating agent 7 obtained in Preparation Example 7 was applied with a Mayer bar so that the cured film thickness was 0.1 μm. After drying in an oven at 70 ° C. for 1 minute, an optical film having a low refractive index layer was produced by irradiating ultraviolet rays with a light amount of 300 mJ / cm ² with a high-pressure mercury lamp.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Example 9
The coating agent 8 for the pressure-sensitive adhesive layer obtained in Preparation Example 8 is dried and cured on the surface of the optical film obtained in Example 2 where the hard coat layer of the PET film, which is a transparent substrate, is not formed. Knife coating was performed so that the post-film thickness was 20 μm. After drying in an oven at 70 ° C. for 1 minute, an optical film having a pressure-sensitive adhesive layer was produced by irradiating ultraviolet rays having a light amount of 300 mJ / cm ² with a high-pressure mercury lamp.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Example 10
The coating agent 9 for clear hard coat layer obtained in Preparation Example 9 is cured on the surface of the optical film obtained in Example 2 where the hard coat layer of the PET film, which is a transparent substrate film, is not formed. The film was coated with a Mayer bar so that the film thickness was 5 μm. After drying in an oven at 70 ° C. for 1 minute, an optical film having a clear hard coat layer on the opposite side of the hard coat layer having an antiglare property is irradiated with ultraviolet light having a light intensity of 300 mJ / cm ² with a high-pressure mercury lamp. Produced.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Comparative Example 1
An optical film was produced in the same manner as in Example 1 except that the coating agent 10 obtained in Preparation Example 10 was coated with a Mayer bar so that the cured film thickness was about 10 μm.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Comparative Example 2
An optical film was produced in the same manner as in Example 1 except that the coating agent 11 obtained in Preparation Example 11 was coated with a Mayer bar so that the cured film thickness was about 10 μm.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Comparative Example 3
An optical film was produced in the same manner as in Example 1 except that the coating agent 1 obtained in Preparation Example 1 was coated with a Mayer bar so that the cured film thickness was about 4 μm.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

Comparative Example 4
An optical film was produced in the same manner as in Example 1 except that the coating agent 1 for hard coat layer obtained in Preparation Example 1 was coated with a Mayer bar so that the cured film thickness was 5 μm.
The performance of this optical film is shown in Table 1 together with the characteristics of each component.

From Table 1, it can be seen that:
As in Examples 1 to 10, when the specific gravity difference between the active energy ray-sensitive composition and the organic fine particles is 0.25 or more, the apparent specific gravity of the organic fine particles with respect to the composition becomes lighter. Even at the above film thickness, the antiglare property is sufficiently exhibited. On the other hand, if the specific gravity difference is less than 0.25 as in Comparative Example 1, the antiglare property is insufficient.
Further, as in Example 1, when there is a refractive index difference between the cured product of the active energy ray-sensitive composition and the organic fine particles (refractive index difference 0.16), internal haze occurs and glare occurs. Excellent prevention. On the other hand, as in Comparative Example 2, when the metal oxide fine particles are not included and the difference in refractive index is small (refractive index difference≈0), the internal haze hardly appears and the glare prevention performance is insufficient. .
Moreover, when Example 1 and Example 8 are compared, Example 8 has a low reflectance and is excellent in antireflection property.

The antiglare hard coat film of the present invention has a specific gravity difference of (A) active energy ray-sensitive composition and (B) organic fine particles contained in a hard coat layer formed on the surface of a transparent plastic film at 25 ° C. By setting it to 0.25 or more, fine particles in the hard coat layer gather near the hard coat layer surface, and external haze (surface irregularities) can be generated even at a film thickness that is greater than the fine particle average particle diameter.
The antiglare hard coat film of the present invention is particularly suitable for polarizing plates in LCDs and the like.

DESCRIPTION OF SYMBOLS 1 Polyvinyl alcohol type polarizer 2 TAC film 2 'TAC film 3 Adhesive layer 4 Release sheet 5 Surface protective film 10 Polarizing plate 11 Polarizer 12 TAC film 12' TAC film 13 Hard coat layer 14 Anti-glare hard coat film 15 Adhesion Adhesive layer 15 'Adhesive layer 16 Adhesive layer 17 Release sheet 20 Polarizing plate

Claims (9)

An active energy ray containing (A) (a-1) metal oxide fine particles and (a-2) a polyfunctional (meth) acrylate monomer and / or (meth) acrylate prepolymer on the surface of the transparent plastic film A sensitive composition, and (B) a hard coat layer formed using a hard coat layer forming material containing organic fine particles, wherein the (B) organic fine particles have an average particle diameter of 2 to 5 μm and one type consists solely at a temperature 25 ° C., (a) the specific gravity of the component, at least 0.25 greater than the specific gravity of the component (B), and (a) the difference between the component and the (B) the refractive index of component 0 0.5 a (0 excluded), further wherein a thickness of 8~20μm of the hard coat layer, and antiglare hard, wherein said (B) is larger than the average particle diameter of the organic fine particles Coat film.   (A-1) The antiglare hard coat film according to claim 1, wherein the metal oxide fine particles have a group containing a (meth) acryloyl group as a surface functional group.   (A-1) The antiglare hard coat film according to claim 1 or 2, wherein the metal oxide fine particles are high refractive index fine particles.   The antiglare hard coat film according to any one of claims 1 to 3, wherein the component (A) is an active energy ray-sensitive composition further comprising (a-3) silica fine particles.   (A-3) The antiglare hard coat film according to claim 4, wherein the silica fine particles have a group containing a (meth) acryloyl group as a surface functional group.   The antiglare hard coat film according to any one of claims 1 to 5, wherein a low refractive index layer is further laminated on the hard coat layer.   The antiglare hard coat film according to any one of claims 1 to 6, wherein an adhesive layer is laminated on the surface of the transparent plastic film on which the hard coat layer is not formed.   The antiglare hard coat film according to any one of claims 1 to 6, wherein another hard coat layer is laminated on the surface of the transparent plastic film on which the hard coat layer is not formed.   The polarizing plate formed by bonding the surface on the opposite side of the hard-coat layer formation surface of the anti-glare hard coat film in any one of Claims 1-7 to a polarizer.

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