JP2010266658A - Antireflective film and polarizing plate using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antireflective film which has an antireflection function, and is excellent in scratch resistance and glare resistance as well, and has a simple layer constitution, is inexpensive and is particularly suitable as the one for a polarizing plate. <P>SOLUTION: The antireflective film is configured such that a hard coat layer formed using a hard coat layer-forming material and a low refractive index layer with a refractive index of ≤1.43 and a thickness of 50-200 nm including a cured resin by the emission of active energy rays, are laminated in order on the surface of a transparent plastic film, wherein (1) the hard coat layer-forming material contains: (A) an active energy ray sensation-type composition containing (a) polyfunctional(meth)acrylate and (b) silica-based fine particles; (B) organic fine particles; and (C) a dispersant having at least one polar group in the molecule, (2) the film thickness of the hard coat layer is larger than the average particle diameter of the organic fine particles, and (3) the refractive index of the cured material of the (A) active energy ray sensation-type composition is 1.46 to 1.80. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an antireflection film and a polarizing plate using the same. More specifically, the present invention has an antireflection function, is excellent in scratch resistance and antiglare properties, has a simple layer structure and is low in cost, and particularly suitable for use as a polarizing plate. It relates to the polarizing plate used.

In an image display device such as a plasma display (PDP), a cathode ray tube (CRT), a liquid crystal display (LCD), etc., light is incident on the screen from the outside, and this light may be reflected to make it difficult to see the displayed image. In recent years, with the increase in the size of displays, it has become increasingly important to solve the above problems.
In order to solve such a problem, various antireflection treatments and antiglare treatments have been taken for various displays so far. As one of them, an antireflection film is used for various displays.
Conventionally, this antireflection film is formed by a method of thinning a low refractive index substance (MgF ₂ ) on a base film by a dry process method such as vapor deposition or sputtering, or a high refractive index substance [ITO (tin-doped Indium oxide), TiO _2, etc.] and a material having a low refractive index (MgF ₂ , SiO _2, etc.) are alternately stacked. However, the antireflection film produced by such a dry process method has a problem that the production cost is unavoidable.
Therefore, in recent years, an attempt has been made to produce an antireflection film by a wet process method, that is, coating. However, the antireflection film produced by the wet process method has a problem that the surface is inferior in scratch resistance as compared with the antireflection film by the dry process method.

Therefore, in order to solve the above problems in the wet process method, a cured layer (hard coat layer) is further formed using an ionizing radiation curable resin composition. For example, on a base film, (1) a hard coat layer having a thickness of 2 to 20 μm containing a cured resin by ionizing radiation, a cured resin by ionizing radiation, and at least two kinds of metal oxides containing antimony-doped tin oxide, A high refractive index layer having a refractive index in the range of 1.65 to 1.80 and a thickness of 60 to 160 nm, and a siloxane-based polymer having a refractive index in the range of 1.37 to 1.47. Optical film formed by sequentially laminating low refractive index layers of 180 nm (see, for example, Patent Document 1), (2) hard coat having a thickness of 2 to 20 μm, including a metal oxide and a cured product by heat or ionizing radiation An optical film comprising a layer, and a low refractive index layer having a thickness of 40 to 200 nm and having a refractive index in the range of 1.30 to 1.45, including porous silica and a polysiloxane polymer (for example, , Patent Reference 2) is disclosed.
These optical films are antireflection films that effectively prevent reflection of light on the surface of the image display element and are excellent in scratch resistance.

  By the way, in the optical film used for each said display, in recent years, in order to reduce the usage-amount of an optical film, the request | requirement with respect to a multifunctional optical film has increased. Multifunctional optical films include, for example, antireflection functions, scratch resistance, antiglare functions for preventing glare caused by reflection of indoor light sources such as fluorescent lamps, and near-infrared blocking functions for PDPs. Can include an optical film having at least two functions selected from an antistatic function and an antifouling function.

JP 2002-341103 A JP 2003-139908 A

  The present invention has been made under such circumstances, has an antireflection function, is excellent in scratch resistance and antiglare properties, has a simple layer structure, is low in cost, and particularly suitable for a polarizing plate. It aims at providing a prevention film.

As a result of intensive studies to achieve the above object, the present inventors have found that an active energy ray-sensitive composition in which the refractive index of a cured product containing silica-based fine particles is within a predetermined range, organic fine particles, molecules A hard coat layer is formed using a hard coat layer forming material containing a dispersing agent having at least one polar group therein, and a hardened resin by irradiation with active energy rays is further formed on the hard coat layer. It has been found that the object can be achieved by providing a low refractive index layer having a predetermined thickness below a certain value. The present invention has been completed based on such findings.
That is, the present invention
[1] A transparent plastic film including a hard coat layer formed using a hard coat layer forming material and a cured resin by irradiation with active energy rays and having a refractive index of 1.43 or less and a thickness of 50 to 200 nm An antireflection film in which low refractive index layers are sequentially laminated,
(1) The hard coat layer forming material comprises (A) (a) a polyfunctional (meth) acrylate and (b) an active energy ray-sensitive composition containing silica-based fine particles, (B) organic fine particles, and ( C) a material containing a dispersant having at least one polar group in the molecule;
(2) The film thickness of the hard coat layer is larger than the average particle size of the organic fine particles (B), and (3) the refractive index of the cured product of the active energy ray-sensitive composition (A) is 1. .46 to 1.80,
Anti-reflection film, characterized by
[2] (C) The dispersant having at least one polar group in the molecule has, as the polar group, at least one selected from a functional group showing acidity and a primary to tertiary amino group. The antireflection film according to the above item [1],
[3] The antireflective film as described in the above item [2], wherein (C) the dispersant having at least one polar group in the molecule has an N, N-dialkylamino group,
[4] The reflection according to any one of [1] to [3] above, wherein the (b) silica-based fine particles are silica fine particles having a group containing a (meth) acryloyl group as a surface functional group. Prevention film,
[5] The antireflection film as described in any one of [1] to [4] above, wherein the organic fine particles (B) have an average particle diameter of 6 to 10 μm,
[6] Item [1] to [5] above, wherein the difference in refractive index between (A) the cured product of the active energy ray-sensitive composition and (B) organic fine particles is 0.1 or less. The antireflection film according to any one of
[7] The antireflection film as described in any one of [1] to [6] above, wherein the low refractive index layer contains 30 to 80% by mass of porous silica.
[8] The antireflection film as described in any one of [1] to [7] above, wherein the external haze value is 20% or less, and [9] from the above [1] to [8] A polarizing plate having the antireflection film according to any one on a surface thereof,
Is to provide.

  ADVANTAGE OF THE INVENTION According to this invention, while having an antireflection function, it is excellent also in abrasion resistance and anti-glare property, and the layer structure is simple, the cost is low, and it is suitable especially for polarizing plates, and polarized light using the same Board can be provided.

It is a perspective view which shows the structure of one example of a polarizing plate. It is a section film type figure showing the composition of one example of the polarizing plate of the present invention.

In the antireflection 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 contains (A) an active energy ray-sensitive composition, (B) organic fine particles, and (C) a dispersant having at least one polar group in the molecule.
((A) Active energy ray sensitive composition)
In the hard coat layer forming material, the active energy ray-sensitive composition used as the component (A) contains (a) polyfunctional (meth) acrylate and (b) silica-based fine particles as essential components.
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. (Meth) acrylate means both methacrylate and acrylate.

<(A) Multifunctional (meth) acrylate>
In the present invention, as the (a) polyfunctional (meth) acrylate, a polyfunctional (meth) acrylate monomer and / or a (meth) acrylate prepolymer is used.
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. The weight average molecular weight of the polyfunctional (meth) acrylate-based prepolymer is preferably 50,000 or less, more preferably 500 to 50,000, and still more preferably a value in terms of standard polymethyl methacrylate measured by the GPC method. It is selected in the range of 3,000 to 40,000. 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.

（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。 <(B) Silica-based fine particles>
In the present invention, colloidal silica fine particles and / or silica fine particles having a surface functional group can be used as (b) silica-based fine particles.
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).
In the reactive silica fine particle, for example, a polymerizable unsaturated group-containing organic compound having a functional group capable of reacting with the silanol group is reacted with a silanol group on the surface of the silica fine particle having an average particle diameter of about 0.005 to 1 μm. Can be obtained. Examples of the polymerizable unsaturated group include a radical polymerizable (meth) acryloyl group.
Examples of the polymerizable unsaturated group-containing organic compound having a functional group capable of reacting with the silanol 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.
The silica fine particles bonded with the polymerizable unsaturated group-containing organic compound thus obtained 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 antireflection film.
As an active energy ray-sensitive composition (A) containing a compound formed by bonding an organic compound having a polymerizable unsaturated group to such silica fine particles, for example, trade names “OPSTAR Z7530”, “JSR Co., Ltd.”, “ "OPSTAR Z7524", "OPSTAR TU4086", etc. are on the market.
In the present invention, the content of the silica-based fine particles of the component (b) is usually about 5 to 90% by mass, preferably 10 to 70, in the solid content of the active energy ray sensitive composition of the component (A). % By mass.
In addition, the average particle diameter of the silica particles in the silica-based fine particles of the component (b) 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.

  In the active energy ray-sensitive composition (A), the refractive index of the cured product is selected in the range of 1.46 to 1.80, preferably 1.49 to 1.75. When the refractive index of the cured product is in the above range, the obtained antireflection film exhibits a good antireflection function.

((B) Organic fine particles)
In the hard coat layer forming material in 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, acrylic-styrene copolymer fine particles, polycarbonate fine particles, Examples thereof include polyethylene fine particles, polystyrene fine particles, and benzoguanamine resin fine particles.
The shape of the organic fine particles is not particularly limited, but the organic fine particles must be spherical in order to maximize the effect of the present invention that suppresses sedimentation of the organic fine particles by the below-described (C) dispersant. Is preferred. Moreover, the spherical thing is preferable also from a viewpoint which homogenizes the glare-proof performance of a hard-coat layer and improves reproducibility. From the same viewpoint, those having a narrow particle size distribution are preferred. That is, the organic fine particles are spherical, and the average particle size is preferably 6 to 10 μm from the viewpoint of antiglare performance, and the particle size distribution is within ± 2 μm of the average particle size measured by the coal counter method. Those having a weight fraction of 70% or more are preferred. The method for measuring the average particle diameter will be described later.
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.
In the present invention, the cured product of the active energy ray-sensitive composition that is the component (A) described above and the organic fine particles that are the component (B) have various refractive index differences depending on the purpose. You can choose. For example, when the antireflection film is a high-contrast type, the refractive index difference is preferably such that the absolute value of the refractive index difference is small so that internal haze does not appear, and is preferably 0 to 0.03, more preferably 0. ~ 0.02. Moreover, when making an antireflection film into a general purpose type, 0.03-0.2 are preferable and 0.04-0.1 are more preferable in order to express internal haze in a controllable manner. That is, the refractive index difference is generally preferably 0.2 or less, and more preferably 0.1 or less. The method for measuring the refractive index of the cured product of the active energy ray-sensitive composition and the organic fine particles will be described later.

((C) Dispersant)
In the hard coat layer forming material of the present invention, the dispersant used as the component (C) is a compound having at least one polar group in the molecule, and examples of the polar group include a carboxyl group, a hydroxyl group, a sulfo group. Groups, primary amino groups, secondary amino groups, tertiary amino groups, amide groups, quaternary ammonium bases, pyridium bases, sulfonium bases, phosphonium bases and the like. Among these, a carboxyl group, a sulfo group, and a primary to tertiary amino group are preferable. One or more of these polar groups may be introduced into the molecule.
In the case of having a plurality of polar groups in the molecule, a component that binds the compounds having each polar group is required. Examples of such components include polyoxyalkylene glycol. The polar group will be present in the side chain. The molecular weight of such a component is not particularly limited, but can be selected from a wide range of about several hundred to several hundred thousand.
The dispersant having at least one polar group in the molecule suppresses the sedimentation of the organic fine particles in the hard coat layer having a film thickness larger than the average particle size of the organic fine particles, and the fine particles are dispersed on the surface of the hard coat layer. It exists in the vicinity in a large amount and has an effect of improving the antiglare performance.
Although the mechanism is not necessarily clear, the following can be considered.
The polar groups in the dispersant are coordinated to the surface of the organic fine particles, and as a result, the polarity of the surface of the organic fine particles changes, and the probability that the organic fine particles are present in the vicinity of the surface increases. As a result, the average particle size of the organic fine particles Even in the above film thickness, organic fine particles are present in the vicinity of the surface of the hard coat layer, which is considered to improve the antiglare performance.

Moreover, as a preferable example of the polar group in the said dispersing agent, the polar group derived from the C1-C8 N, N-dialkylamino group of an alkyl group can be mentioned. Further, as the compound having the polar group, an N, N-dialkylaminoalkanol having a dialkylamino group having 1 to 8 carbon atoms of each alkyl group as a polar group is particularly preferable from the viewpoint of availability.
Specific examples of the N, N-dialkylaminoalkanol include N, N-dimethylaminoethanol, N, N-diethylaminoethanol, N, N-dipropylaminoethanol, N, N-dibutylaminoethanol, N, N. -Dipentylaminoethanol, N, N-dihexylaminoethanol, and the like, and compounds in which the ethanol moiety in these compounds is replaced with propanol or butanol can be mentioned. The two alkyl groups in the N, N-dialkylamino group may be the same or different.
Moreover, as a dispersing agent which has two or more polar groups derived from a N, N- dialkylamino group, N, N-dialkylamino alkanol modified polyoxyalkylene glycol can be mentioned preferably, for example. Specifically, N, N-dimethylaminoethanol-modified polyoxyalkylene glycol, N, N-diethylaminoethanol-modified polyoxyalkylene glycol, N, N-dipropylaminoethanol-modified polyoxyalkylene glycol, N, N-dibutylamino Ethanol-modified polyoxyalkylene glycol, N, N-dipentylaminoethanol-modified polyoxyalkylene glycol, N, N-dihexylaminoethanol-modified polyoxyalkylene glycol, etc., and compounds in which the ethanol moiety in these compounds is replaced with propanol or butanol And so on.

  In the present invention, the dispersant for component (C) may be used alone or in combination of two or more. Further, the blending amount thereof is the solid content 100 of the active energy ray-sensitive composition which is the component (A) described above from the viewpoint of the balance of the antiglare property, scratch resistance, other physical properties, economy and the like of the hard coat layer. Preferably it is 0.01-10 mass parts with respect to a mass part, More preferably, it is 0.05-5 mass parts.

(Photopolymerization initiator)
The hard coat layer forming material in the present invention may contain a photopolymerization initiator as desired. Examples of the 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-curable compound. Is selected within the range. Here, the total active energy ray-curable compound means a compound containing reactive silica fine particles when (b) silica-based fine particles are used.

(Preparation of hard coat layer forming material)
The hard coat layer forming material used in the present invention is prepared by dispersing the active energy ray-sensitive composition of component (A), organic fine particles of component (B), and component (C) in an appropriate solvent as necessary. Add the agent and photopolymerization initiator and various additional components used as desired, for example, antioxidants, UV absorbers, silane coupling agents, light stabilizers, leveling agents, antifoaming agents, etc. It can be prepared by dissolving or dispersing.
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 selected according to the situation.

[Transparent plastic film]
In the antireflection 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 salts. 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 7 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 preferred thickness is in the range of 8-15 μm.

[Low refractive index layer]
In the antireflection film of the present invention, a low refractive index layer having a refractive index of 1.43 or less and a thickness of 50 to 200 nm containing a cured resin by irradiation with active energy rays is formed on the hard coat layer thus formed. Is provided.
The low refractive index layer is, for example, a coating film for forming a low refractive index layer containing the polyfunctional (meth) acrylate described in the hard coat layer, preferably porous silica particles, and a photopolymerization initiator, if desired. It can be formed by coating the working liquid on the hard coat layer to form a coating film, irradiating active energy rays and curing the coating film.
The cured resin by active energy ray irradiation contained in the low refractive index layer is composed of the polyfunctional (meth) acrylate described in the hard coat layer and, if desired, the photopolymerization initiator and various additive components. Can be selected from the same range as the blending and physical properties.
The porous silica particles contained in the low refractive index layer are preferably those having a specific gravity of 1.7 to 1.9, a refractive index of 1.25 to 1.36, and an average particle size of 20 to 100 nm. Used. By using porous silica particles having such properties, an antireflection film having a single layer type antireflection layer having excellent antireflection performance can be obtained.
In the present invention, the content of the porous silica particles in the low refractive index layer is preferably selected in the range of 30 to 80% by mass, and more preferably 50 to 80% by mass, particularly 60 A range of ˜75 mass% is preferred. When the content of the porous silica particles is in the above range, the low refractive index layer becomes a layer having a desired low refractive index, and the obtained antireflection film has excellent antireflection properties.
The low refractive index layer has a thickness of 50 to 200 nm and a refractive index of 1.43 or less, preferably 1.30 to 1.42. When the thickness and refractive index of the low refractive index layer are in the above ranges, an antireflection film excellent in antireflection performance and scratch resistance can be obtained. The thickness of the low refractive index layer is preferably 70 to 130 nm, and the refractive index is more preferably in the range of 1.35 to 1.40.

This low refractive index layer coating solution used in the present invention, if necessary, in an appropriate solvent, the polyfunctional (meth) acrylate, preferably porous silica particles, and the above-described optionally used. The photopolymerization initiator is further prepared by adding various additives such as antioxidants, ultraviolet absorbers, light stabilizers, leveling agents, antifoaming agents, etc. in predetermined proportions and dissolving or dispersing them. be able to.
About the solvent used in this case, it can select from the range equivalent to the solvent quoted by the description of the above-mentioned hard-coat layer.
The concentration and viscosity of the coating solution thus prepared are not particularly limited as long as the concentration and viscosity can be coated, and can be appropriately selected depending on the situation.
A coating solution for a low refractive index layer is coated on the hard coat layer 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. Then, a coating film is formed, and after drying, the coating film is cured by irradiating the active energy ray to form a low refractive index layer.
About the active energy ray used for formation of a low refractive index layer, it is the same as that of the description of the above-mentioned hard-coat layer.

[Preparation of antireflection film]
As a method for producing the antireflection film of the present invention, for example, the following method can be employed.
First, the hard coat layer forming material is applied to one side of the transparent plastic film by the method described above, dried to form a coating film, then irradiated with active energy rays and cured to form a hard coat layer. Let Next, on this hard coat layer, a coating solution for forming a low refractive index layer is applied and dried in the same manner as described above to form a coating film. By forming the refractive index layer, the antireflection film of the present invention can be produced.
When forming the hard coat layer, the active energy rays are irradiated so as to become a cured layer of about half cure, and when the low refractive index layer is formed, the lower half cured layer is completely cured simultaneously to form a hard layer. A coat layer may be formed.

[Optical characteristics of antireflection film]
The optical characteristics of the antireflection film of the present invention formed as described above may have different preferable values depending on the type.
In the case of a high contrast type, the internal haze value is usually 0 to 10%. Even if the internal haze value is within this range and glare occurs, high contrast can be achieved, and this can be applied sufficiently depending on the type of display (design concept). If the internal haze value exceeds 10%, high contrast cannot be obtained (a general-purpose type). In the case of a general-purpose type, the internal haze value is usually 5 to 40%. If the internal haze is less than 5%, the performance of suppressing glare is insufficient, and if it exceeds 40%, the visibility is lowered. The preferable internal haze value of the general-purpose type antireflection film is usually 10 to 35%, and more preferably 15 to 30%.
The external haze value is preferably 20% or less from the viewpoint of visibility for both the high contrast type and the general-purpose type, and is preferably 5% or more from the viewpoint of antiglare property. The external haze value is a value obtained by measuring the total haze value and the internal haze value of the antireflection film and obtaining the difference between the total haze value and the internal haze value.
Further, the reflectance at a wavelength of 500 to 700 nm is usually 4% or less, preferably 3% or less, and the 60 ° gloss value is preferably 20 to 95 for both the high contrast type and the general purpose type. When the 60 ° gloss value exceeds 95, the surface glossiness is large (the reflection of light is large), and the antiglare property is adversely affected. If the 60 ° gloss is less than 20, it becomes easy to generate white tea. Further, the total light transmittance of the antireflection film is preferably 88% or more, more preferably 90% or more. If the total light transmittance is less than 88%, the transparency may be insufficient.
The method for measuring the optical characteristic value will be described later.

[Other functional layers]
In the antireflection film of the present invention, an antifouling coating layer can be provided on the low refractive index layer. This antifouling coating layer is generally obtained by applying a coating solution containing a fluororesin 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. It can be formed by coating on a low refractive index layer, forming a coating film, and drying.
The thickness of the antifouling coating layer is usually in the range of 1 to 10 nm, preferably 3 to 8 nm. By providing the antifouling coating layer, the resulting antireflection film has improved surface slipperiness and becomes more difficult to be stained. Depending on the type of the antifouling coating layer, the antistatic property can be improved.

[Adhesive layer]
In the antireflection 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 low refractive index 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 antireflection film formed with such an adhesive layer is suitably used as a member for imparting antireflection performance, antiglare performance, scratch resistance, etc. to displays such as CRT, LCD, PDP, etc. It is suitable for polarizing plate sticking in LCD or the like.

[Polarizer]
The present invention also provides a polarizing plate having the above-described antireflection film of the present invention on its surface.
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 one in which the hard coat layer and the low refractive index layer according to the present invention described above are provided on one of the TAC films 2, 2 ′ provided on both surfaces of the polarizer 1. Preferably there is. 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 and the low refractive index layer according to the present invention are particularly provided on the TAC film 2 'side on the surface protective film 5 side. It is good to provide.

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 and a low refractive index layer 14 according to the present invention are formed on one surface thereof, and reflection is performed. The prevention film 15 is used. Next, the TAC film 12 in which the hard coat layer 13 and the low refractive index layer 14 are not formed is laminated on one surface of the polarizer 11, and the antireflection film 15 is laminated on the opposite surface using the adhesive layers 16 and 16 ′. . 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 antireflection performance, antiglare performance, and scratch resistance is obtained. If necessary, the polarizing plate 20 is attached to the surface provided with the low refractive index layer 14 on the peelable surface protective film 5 shown in FIG. 1 or an optical component such as a liquid crystal cell on the opposite surface. An adhesive layer 17 and a release sheet 18 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.
Various characteristics in each example were determined according to the following methods.
<Organic fine particles>
(1) Average particle diameter Measured by Coulter counter method.
(2) Refractive index Based on the composition of the monomer of the organic fine particles, the average refractive index determined from the refractive index of the contained monomer and the contained mass ratio was taken as the refractive index of the organic fine particles.
<Active energy ray sensitive composition>
(3) Refractive index of hardened | cured material In each preparation example, the coating agent which consists of an active energy ray sensitive type composition (A), a photoinitiator, and a dilution solvent is produced. This was applied to a TAC film [manufactured by Fuji Film Co., Ltd., trade name “TAC80TD80ULH”] in the same manner as in the Example to obtain a hard coat film for measuring the refractive index of the cured product. The refractive index of the hard coat layer was determined using an Abbe refractometer manufactured by Atago Co., Ltd., and this was used as the refractive index of the cured product of the active energy ray-sensitive composition.
<Low refractive index layer>
(4) Refractive index A coating agent 7 for a low refractive index layer is prepared according to Preparation Example 7 described later. This was coated on the surface of a TAC film of 80 μm thickness (manufactured by Fuji Film Co., Ltd.) with a Meyer bar so that the cured film thickness was 0.1 μm, dried in an oven at 70 ° C. for 1 minute, and then high pressure A low refractive index layer was formed by irradiating ultraviolet rays of 500 mJ / cm ^{2 with} a mercury lamp.
The refractive index of the obtained low refractive index layer was determined by an Abbe refractometer [manufactured by Atago Co., Ltd., product name “Abbe refractometer 4T”, Na light source, wavelength: about 590 nm], and this was used as the refractive index of the low refractive index layer.

<Antireflection film>
(5) Total light transmittance and total haze value Using a Nippon Denshoku Industries Co., Ltd. haze meter "NDH-2000", a total light transmittance and a total haze value are measured based on JISK7136. The total haze value indicates the total value of the haze value (internal haze value) attributed to the inside and the external haze value attributed to surface irregularities.
(6) Internal haze value and external haze value To 100 parts by mass of acrylic pressure-sensitive adhesive [manufactured by Nippon Carbide, trade name “PE-121”], isocyanate cross-linking agent [trade name “BHS-8515”, manufactured by Toyo Ink Co., Ltd.] 2 parts by mass and 100 parts by mass of toluene were added to prepare an adhesive solution. Apply a pressure-sensitive adhesive solution to a 50 μm thick polyethylene terephthalate [trade name “A4300” manufactured by Toyobo Co., Ltd.] film to a thickness of 20 μm after drying, and dry at 100 ° C. for 3 minutes to form a pressure-sensitive adhesive sheet. Produced. The produced adhesive sheet was affixed on the hard coat layer of the hard coat film to obtain a sample for determining internal haze. The haze value of the adhesive sheet and the internal haze determination sample is measured, and the value obtained by subtracting the haze value of the adhesive sheet from the haze value of the internal haze determination sample is defined as the internal haze value of the hard coat film. In addition, when the internal haze value of the base film (triacetyl cellulose film) and the polyethylene terephthalate film used in Examples and Comparative Examples was measured in the same manner, it was less than 0.01% and could be ignored. The measurement of the haze value is the same as (5) above.
(7) Evaluation of antiglare property A sample obtained by attaching an antireflection film to an acrylic resin blackboard [manufactured by Sumitomo Chemical Co., Ltd.] via an acrylic adhesive is visually observed under a fluorescent lamp, and the following determination is made. The anti-glare property is evaluated by the standard.
○: Fluorescent lamps have sufficient anti-reflective properties and little white-brown color ×: Fluorescent lamps have insufficient anti-reflective properties, or fluorescent lamps have sufficient anti-reflective properties, but white-brown color is large Those inferior in visibility (8) 60 ° gloss value Measured according to JIS K 7105 using a gloss meter “VG2000” manufactured by Nippon Denshoku Industries Co., Ltd.
(9) Pencil hardness Based on JIS K5400, it measures using the pencil scratch coating film hardness tester "No553-M1" of Yasuda Seiki Seisakusho.
(10) Reflectance Using a spectral hardness meter “UV-3101PC” manufactured by Shimadzu Corporation, the reflectance at wavelengths of 500 nm, 600 nm and 700 nm was measured.

Preparation Example 1 Hard Coating Layer Coating Agent 1
(A) As active energy ray-sensitive composition, hard coat agent [manufactured by JSR Corporation, trade name “OPSTAR Z7524”, solid content concentration 70 mass%, total of reactive silica fine particles and polyfunctional (meth) acrylate 65% by mass, photopolymerization initiator 5% by mass, methyl ethyl ketone 30% by mass, cured product refractive index 1.50] 100 parts by mass, (B) spherical organic fine particles, acrylic fine particles [manufactured by Soken Chemical Co., Ltd. , Polymethylmethacrylate crystals, average particle size 3 μm, refractive index 1.49] 11.25 parts by mass, (C) a dispersant having a tertiary amine as a polar group [manufactured by Big Chemie Japan, trade name “ dispersbyk103 ", solid content concentration of 40% by mass], 3 parts by mass, and 90 parts by mass of propylene glycol monomethyl ether as a diluting solvent are uniformly mixed to obtain a solid content of about 40% by mass It was prepared there for a hard coat layer coating agent 1. Table 1 shows the composition of the coating agent and the physical properties of the components.

Preparation Example 2 Hard Coating Layer Coating Agent 2
(B) Preparation Example 1 except that the spherical organic fine particles were changed to 11.25 parts by mass of acrylic fine particles [manufactured by Soken Chemical Co., Ltd., polymethyl methacrylate crystal, average particle size 5 μm, refractive index 1.49]. In the same manner as above, a hard coat layer coating agent 2 having a solid content of about 40% by mass was prepared. Table 1 shows the composition of the coating agent and the physical properties of the components.

Preparation Example 3 Hard Coating Layer Coating Agent 3
(B) Preparation Example 1 except that the spherical organic fine particles were changed to 11.25 parts by mass of acrylic fine particles [manufactured by Soken Chemical Co., Ltd., polymethyl methacrylate crystal, average particle size 8 μm, refractive index 1.49]. In the same manner as above, a hard coat layer coating agent 3 having a solid content of about 40% by mass was prepared. Table 1 shows the composition of the coating agent and the physical properties of the components.

Preparation Example 4 Coating agent 4 for hard coat layer
(B) The solid content was the same as in Preparation Example 1 except that the spherical organic fine particles were changed to 11.25 parts by mass of acrylic fine particles [manufactured by Soken Chemical Co., Ltd., average particle size 8 μm, refractive index 1.55]. The coating agent 4 for hard-coat layers which is about 40 mass% was prepared. Table 1 shows the composition of the coating agent and the physical properties of the components.

Preparation Example 5 Hard coat layer coating agent 5
(B) Solid organic fine particles were prepared in the same manner as in Preparation Example 1 except that acrylic organic fine particles were changed to 11.25 parts by mass of acrylic fine particles [manufactured by Soken Chemical Co., Ltd., average particle size 8 μm, refractive index 1.55]. A coating agent 5 for a hard coat layer having a content of about 40% by mass was prepared. Table 1 shows the composition of the coating agent and the physical properties of the components.

Preparation Example 6 Coating agent 6 for hard coat layer
(C) A hard coat layer coating agent 6 having a solid content of about 40% by mass was prepared in the same manner as in Preparation Example 1 except that the dispersant was not used. Table 1 shows the composition of the coating agent and the physical properties of the components.

Preparation Example 7 Low Refractive Index Layer Coating Agent 7
Multifunctional (meth) acrylate [manufactured by Arakawa Chemical Co., Ltd., trade name “Beamset 575CB”, solid content 100%] 100 parts by mass, photopolymerization initiator [manufactured by Ciba Specialty Chemicals, trade name “Irgacure 907 ]] 5 parts by mass, and then a methyl isobutyl ketone (MIBK) dispersion of porous silica particles [manufactured by Catalyst Kasei Kogyo Co., Ltd., trade name “ELCOM RT-1002SIV”, solid content: 21% by mass, porous silica Particles: specific gravity 1.8, refractive index 1.30, average particle size 60 nm] After mixing 1200 parts by mass, dilute with MIBK so that the total solid content concentration is 2% by mass, for low refractive index layer Coating agent 7 was prepared.

Example 1
On the surface of an 80 μm thick triacetyl acetate (TAC) film [manufactured by Fuji Film Co., Ltd.], the hard coat layer coating agent 1 obtained in Preparation Example 1 is applied with a Meyer bar so that the cured film thickness is about 10 μm. Coated. After drying in an oven at 70 ° C. for 1 minute, 100 mJ / cm ² ultraviolet rays were irradiated with a high-pressure mercury lamp to obtain a half-cured hard coat layer. Furthermore, the coating agent 7 for the low refractive index layer obtained in Preparation Example 7 was applied on the hard coat layer with a Mayer bar so that the cured film thickness was 100 nm, and dried in an oven at 70 ° C. for 1 minute. A low refractive index layer was formed by irradiating with an ultraviolet ray of 500 mJ / cm ² with a high pressure mercury lamp, and the hard coat layer was completely cured to obtain an antireflection film. The performance and other characteristics of this antireflection film are shown in Table 1 and Table 1.

Example 2
An antireflection film was obtained in the same manner as in Example 1, except that the hard coat layer 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 and other characteristics of this antireflection film are shown in Table 1 and Table 1.
Example 3
An antireflection film was obtained in the same manner as in Example 1 except that the coating agent 3 for hard coat layer obtained in Preparation Example 3 was coated with a Mayer bar so that the cured film thickness was about 10 μm. The performance and other characteristics of this antireflection film are shown in Table 1 and Table 1.

Example 4
An antireflection film was obtained in the same manner as in Example 1 except that the coating agent 4 for hard coat layer obtained in Preparation Example 4 was coated with a Mayer bar so that the cured film thickness was about 10 μm. The performance and other characteristics of this antireflection film are shown in Table 1 and Table 1.
Example 5
An antireflection film was obtained in the same manner as in Example 1 except that the coating agent 5 for hard coat layer obtained in Preparation Example 5 was coated with a Mayer bar so that the cured film thickness was about 10 μm. The performance and other characteristics of this antireflection film are shown in Table 1 and Table 1.

Comparative Example 1
A hard coat film was obtained in the same manner as in Example 1 except that the coating agent 7 for low refractive index layer obtained in Preparation Example 7 was not applied. The performance and other characteristics of this hard coat film are shown in Table 1 and Table 1.
Comparative Example 2
A hard coat film was obtained in the same manner as in Example 2 except that the coating agent 7 for low refractive index layer obtained in Preparation Example 7 was not applied. The performance and other characteristics of this hard coat film are shown in Table 1 and Table 1.
Comparative Example 3
A hard coat film was obtained in the same manner as in Example 3 except that the coating agent 7 for low refractive index layer obtained in Preparation Example 7 was not applied. The performance and other characteristics of this hard coat film are shown in Table 1 and Table 1.

Comparative Example 4
A hard coat film was obtained in the same manner as in Example 4 except that the coating agent 7 for low refractive index layer obtained in Preparation Example 7 was not applied. The performance and other characteristics of this hard coat film are shown in Table 1 and Table 1.
Comparative Example 5
A hard coat film was obtained in the same manner as in Example 5 except that the coating agent 7 for low refractive index layer obtained in Preparation Example 7 was not applied. The performance and other characteristics of this hard coat film are shown in Table 1 and Table 1.
Comparative Example 6
An antireflection film was obtained in the same manner as in Example 1 except that the hard coat layer coating agent 6 obtained in Preparation Example 6 was coated with a Mayer bar so that the cured film thickness was about 10 μm. The performance and other characteristics of this antireflection film are shown in Table 1 and Table 1.

[note]
1) Addition amount of spherical organic fine particles: A value relative to the solid content of the active energy ray-sensitive composition.
2) Cured resin: a cured product of the active energy ray sensitive composition.

  As apparent from Table 1 and Table 1, Examples 1 to 5 having a low refractive index layer have a reflectivity of about 1% compared to Comparative Examples 1 to 5 having no low refractive index layer. Reduce by 1.5%. Further, from Examples 4 and 5, the external haze value can be changed with almost no change in the internal haze depending on the addition amount of the dispersant. Furthermore, from Comparative Example 6, antiglare properties are not exhibited in a system to which no dispersant is added.

Example 6
An acrylic pressure-sensitive adhesive layer having a thickness of 25 μm was provided on the TAC film surface side of the antireflection film obtained in Example 1. On the pressure-sensitive adhesive layer, a polarizer made of a film having a thickness of 25 μm in which iodine was adsorbed and oriented on polyvinyl alcohol was bonded.
On the other hand, a pressure-sensitive adhesive sheet having an acrylic pressure-sensitive adhesive layer having a thickness of 25 μm on both sides of a TAC film having a thickness of 80 μm [manufactured by Fuji Film Co., Ltd.] was prepared. One side of the pressure-sensitive adhesive sheet was bonded so that the release-treated surface of the release sheet [manufactured by Lintec Corporation, “SP-PET3811”] was in contact.
Next, the polarizer was bonded so that the exposed surface of the polarizer was in contact with the surface of the pressure-sensitive adhesive sheet on which the release sheet was not provided, thereby preparing a polarizing plate.

  The antireflection film of the present invention has an antireflection function, is excellent in scratch resistance and antiglare properties, has a simple layer structure, is low in cost, and is particularly suitable for polarizing plates such as LCDs.

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 Low refractive index layer 15 Antireflection film 16 Adhesive layer 16 'Adhesive layer 17 Adhesive layer 18 Release sheet 20 Polarizing plate

Claims (9)

A low refractive index having a refractive index of 1.43 or less and a thickness of 50 to 200 nm, comprising a hard coat layer formed using a hard coat layer forming material on the surface of the transparent plastic film and a cured resin by irradiation with active energy rays. An antireflection film in which layers are sequentially laminated,
(1) The hard coat layer forming material comprises (A) (a) a polyfunctional (meth) acrylate and (b) an active energy ray-sensitive composition containing silica-based fine particles, (B) organic fine particles, and ( C) a material containing a dispersant having at least one polar group in the molecule;
(2) The film thickness of the hard coat layer is larger than the average particle size of the organic fine particles (B), and (3) the refractive index of the cured product of the active energy ray-sensitive composition (A) is 1. .46 to 1.80,
Antireflection film characterized by   (C) The dispersant having at least one polar group in the molecule has, as the polar group, one or more selected from a functional group showing acidity and a primary to tertiary amino group. 1. The antireflection film as described in 1.   (C) The antireflective film according to claim 2, wherein the dispersant having at least one polar group in the molecule has an N, N-dialkylamino group.   The antireflection film according to any one of claims 1 to 3, wherein the silica-based fine particles are silica fine particles having a group containing a (meth) acryloyl group as a surface functional group.   5. The antireflection film according to claim 1, wherein the organic fine particles (B) have an average particle size of 6 to 10 [mu] m.   6. The reflection according to claim 1, wherein the refractive index difference between (A) the cured product of the active energy ray-sensitive composition and (B) the organic fine particles is 0.1 or less. Prevention film.   The antireflective film according to claim 1, wherein the low refractive index layer contains 30 to 80% by mass of porous silica.   The antireflection film according to any one of claims 1 to 7, wherein an external haze value is 20% or less.   The polarizing plate which has the antireflection film in any one of Claims 1-8 on the surface.

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