KR20100123624A - An anti-reflection film and a polarizing plate using the same - Google Patents

Abstract

PURPOSE: An anti-reflection film and a polarizing plate using the same are provided to obtain high scratch resistance and glare resistance. CONSTITUTION: A hard coat layer(13) and a low refractive layer(14) are formed on a film without an optical anisotropy. A TAC(Tri-acetyl-cellulose) film(12) is formed on the plane of a polarizer(11). An adhesive layer(16,16') is formed on both sides of a polarizer.

Description

ANTI-REFLECTION FILM AND A POLARIZING PLATE USING THE SAME}

The present invention relates to an antireflection film and a polarizing plate using the same. More specifically, the present invention has an antireflection function, and is also excellent in scratch resistance and anti-glare, and has a simple layer structure and low cost, and particularly relates to an antireflection film which is very suitable for a polarizing plate, and a polarizing plate using the same. will be.

In image display devices such as plasma displays (PDPs), cathode ray tubes (CRTs), and liquid crystal displays (LCDs), light is incident on the screen from outside, and the light is reflected to make the display image difficult to see. In recent years, with the increase of the size of the display, solving the above problems has become an increasingly important problem.

In order to solve such a problem, various antireflection processing and anti-glare treatment have been taken for various displays so far. As one example, the use of antireflection films in various displays has been carried out.

This antireflection film is conventionally a method of thinning a low refractive index material (MgF ₂ ) on a base film by a dry method such as vapor deposition or sputtering, or a material having a high refractive index [ITO (tin doped oxide). Indium), TiO ₂ , and the like and materials having a low refractive index (MgF ₂ , SiO _2, etc.) are alternately laminated. However, the antireflection film produced by such a dry method has a problem that the manufacturing cost is inevitable.

Therefore, recently, it has been attempted to produce an antireflection film by a wet method, that is, a coating. However, in the antireflection film produced by this wet method, the problem that the surface scratch resistance is inferior as compared with the antireflection film by the above-mentioned dry method arises.

Therefore, in order to solve the said problem in a wet method, forming a hardened layer (hard coat layer) further using the ionizing radiation curable resin composition is performed. For example, (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 metals containing antimony-doped tin oxide on the base film. A high refractive index layer having a thickness of 60 to 160 nm containing an oxide and having a refractive index in the range of 1.65 to 1.80, and a low refractive index layer having a refractive index of 80 to 180 nm having a refractive index in a range of 1.37 to 1.47. The optical film (for example, refer patent document 1) formed by laminating | stacking sequentially, (2) the hard-coat layer of 2-20 micrometers in thickness containing the metal oxide, and the hardened | cured material by heat or ionizing radiation, and porous Optical films (for example, refer patent document 2) etc. which contain a silica and a polysiloxane-type polymer, and are laminated | stacked sequentially the low refractive index layer of 40-200 nm in thickness in the range of 1.30-1.45, etc. are disclosed. have.

These optical films are antireflection films that effectively prevent reflection of light on the surface of an 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 demand for the multifunctional optical film is increasing. As the multifunctional optical film, for example, anti-glare function, anti-glare function to prevent glare due to reflection of indoor light sources such as scratch resistance, fluorescent lamp, etc., and near-infrared ray blocking function, antistatic function, contamination in PDP The optical film which has at least 2 or more types of functions chosen from a prevention function etc. is mentioned.

Japanese Patent Application Laid-Open No. 2002-341103 JP 2003-139908 A

SUMMARY OF THE INVENTION The present invention has been made under such circumstances, and has an object of providing an antireflection film which is very suitable for polarizing plates because it has an antireflection function, is excellent in scratch resistance and anti-glare, and has a simple layer structure and low cost. do.

MEANS TO SOLVE THE PROBLEM As a result of earnestly researching in order to achieve the said objective, the present inventors found that the active energy ray sensitive composition in which the refractive index of the hardened | cured material containing a silica type microparticle is in a predetermined range, an organic fine particle, and at least 1 polar group in a molecule | numerator. A hard coat layer was formed using a hard coat layer-forming material containing a dispersing agent, and on the hard coat layer, a cured resin containing a cured resin by irradiation with an active energy ray had a predetermined thickness of a predetermined thickness or less. By forming a low refractive index layer, it discovered that the objective can be achieved. This invention is completed based on this knowledge.

That is, the present invention,

[1] A low refractive index layer having a thickness of 50 to 200 nm having a refractive index of 1.43 or less, containing a hard coat layer formed on the surface of the transparent plastic film using a hard coat layer forming material and a cured resin by irradiation with active energy rays. As an antireflection film which is sequentially laminated,

(1) An active energy ray-sensitive composition comprising the (A) (a) polyfunctional (meth) acrylate and (b) silica-based fine particles, wherein the hard coat layer-forming material comprises (B) organic fine particles, and ( C) a material containing a dispersant having at least one polar group in a molecule,

(2) the film thickness of the hard coat layer is larger than the average particle diameter of the (B) organic fine particles, and

(3) the antireflection film, wherein the refractive index of the cured product of the active energy ray sensitive composition (A) is 1.46 to 1.80,

[2] The reflection agent according to the above [1], wherein the dispersing agent having at least one polar group in the molecule (C) has at least one member selected from a functional group and a primary to tertiary amino group as an polar group. Prevention Film,

[3] The antireflection film according to the above [2], wherein the dispersant having at least one polar group in the molecule (C) has an N, N-dialkylamino group.

[4] (b) The antireflection film according to any one of [1] to [3], wherein the silica 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 any one of [1] to [4], wherein (B) the organic fine particles have an average particle diameter of 6 to 10 µm.

[6] The antireflection according to any one of the above [1] to [5], wherein a difference in refractive index between the cured product of the active energy ray sensitive composition and the organic fine particles (B) is 0.1 or less. film,

[7] The antireflection film according to any one of [1] to [6], wherein the low refractive index layer contains 30 to 80 mass% of porous silica,

[8] the antireflection film according to any one of [1] to [7], wherein the external haze value is 20% or less; and

[9] A polarizing plate having the antireflection film according to any one of the above [1] to [8] on a surface thereof.

According to the present invention, it is possible to provide an antireflection film having an antireflection function, excellent in scratch resistance and anti-glare, and having a simple layer structure and low cost, which is particularly suitable for a polarizing plate, and a polarizing plate using the same.

1 is a perspective view showing an example of a configuration of a polarizing plate;
2 is a cross-sectional schematic diagram showing a configuration of an example of a 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 to form a hard coat layer formed on at least one side of the transparent plastic film.

[Hard Coat Layer Forming Material]

The hard-coat layer forming material in this invention contains the dispersing agent which has at least 1 polar group in (A) active energy ray sensitive composition, (B) organic fine particles, and (C) molecule | numerator.

((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 addition, in this invention, an active energy ray refers to the thing which has an energy quantum in an electromagnetic wave or a charged particle beam, ie, an ultraviolet-ray, an electron beam, etc. In addition, (meth) acrylate means both a methacrylate and an acrylate.

<(a) Polyfunctional (meth) acrylate>

In this invention, a polyfunctional (meth) acrylate type monomer and / or a (meth) acrylate type prepolymer are used as (a) polyfunctional (meth) acrylate.

As said polyfunctional (meth) acrylate type monomer, 1, 4- butanediol di (meth) acrylate, 1, 6- hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, Polyethylene glycol di (meth) acrylate, hydroxypivarine neopentyl glycol di (meth) acrylate, dicyclopentanyldi (meth) acrylate, caprolactone modified dicyclopentenyldi (meth) acrylate, ethylene oxide Modified phosphoric acid di (meth) acrylate, allylated 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 , Such as tris (acryloxyethyl) isocyanurate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol hexa (meth) acrylate (Meth) acrylate is mentioned. One type of these monomers may be used, or two or more types may be used in combination.

On the other hand, as said (meth) acrylate type prepolymer, a polyester acrylate type, an epoxy acrylate type, a urethane acrylate type, a polyol acrylate type etc. are mentioned, for example. Here, as a polyester acrylate type prepolymer, the hydroxyl group of the polyester oligomer which has a hydroxyl group in the sock end obtained by condensation of polyhydric carboxylic acid and a polyhydric alcohol, for example, is esterified with (meth) acrylic acid, or a polyhydric carboxylic acid The hydroxyl group of the terminal part of the oligomer obtained by adding an alkylene oxide can be obtained by esterifying with (meth) acrylic acid.

An epoxy acrylate prepolymer can be obtained by, for example, reacting and esterifying (meth) acrylic acid to an oxirane ring of a relatively low molecular weight bisphenol-type epoxy resin or a novolak-type epoxy resin. A urethane acrylate type prepolymer can be obtained by esterifying the polyurethane oligomer obtained by reaction of a polyether polyol, polyester polyol, and polyisocyanate, for example with (meth) acrylic acid. In addition, a polyol acrylate type prepolymer can be obtained by esterifying the hydroxyl group of a polyether polyol with (meth) acrylic acid. As for the weight average molecular weight of the said polyfunctional (meth) acrylate type | system | group prepolymer, the value of the standard polymethyl methacrylate conversion measured by GPC method, 50,000 or less are preferable, More preferably, it is 500-50,000, More preferably, Preferably it is selected in the range of 3,000 ~ 40,000. 1 type of these prepolymers may be used, may be used in combination of 2 or more type, and may be used together with the said polyfunctional (meth) acrylate type monomer.

<(b) Silica Fine Particles>

In the present invention, (b) silica fine particles having colloidal silica fine particles and / or surface functional groups can be used as the silica fine particles.

The colloidal silica fine particles have an average particle diameter of about 1 to 400 nm, and, as silica fine particles having a surface functional group, for example, silica fine particles having a group containing a (meth) acryloyl group as the surface functional group (hereinafter reactive) May be referred to as silica fine particles).

The reactive silica fine particles can be obtained by, for example, 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 polymerizable unsaturated group-containing organic compound having a functional group capable of reacting with the silanol group. have. As a polymerizable unsaturated group, a radically polymerizable (meth) acryloyl group etc. are mentioned, for example.

As a polymerizable unsaturated group containing organic compound which has a functional group which can react with the said silanol group, For example, General formula (I)

[Tue 1]

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

[Tue 2]

Compound represented by the above) is preferably used.

Examples of such a compound include acrylic acid, acrylic acid chloride, 2-isocyanatoethyl acrylate, glycidyl acrylate, 2,3-iminopropyl acrylate, 2-hydroxyethyl acrylate, acryloyloxypropyltrimethoxy Methacrylic acid derivatives corresponding to silane and the like and acrylic acid derivatives thereof can be used. These acrylic acid derivatives and methacrylic acid derivatives may be used alone, or may be used in combination of two or more thereof.

The silica fine particles to which the polymerizable unsaturated group-containing organic compound thus obtained is bonded are crosslinked and cured by irradiation of active energy rays as an active energy ray curing component.

These reactive silica fine particles have the effect of improving the scratch resistance of the antireflective film obtained.

As an active energy ray sensitive composition (A) containing the compound which combines the organic compound which has a polymerizable unsaturated group with such silica microparticles | fine-particles, JSR Corporation make, brand name "OPSTAR Z7530", "Opster Z7524", "Opstar TU4086", etc. are marketed.

In this invention, content of the silica type microparticles | fine-particles of this (b) component is about 5-90 mass% normally in solid content of the active energy ray sensitive composition of (A) component, Preferably it is 10-70 mass%.

In addition, the average particle diameter of the silica particle in the silica type microparticles | fine-particles of this (b) component can be measured by a laser diffraction scattering method. In this method, the average particle diameter is measured by changing the intensity of light diffracted and scattered when a laser beam is applied to a liquid in which particles are dispersed.

In the said (A) active energy ray sensitive composition, the refractive index of this hardened | cured material is 1.46-1.80, Preferably it is selected in the range of 1.49-1.75. If the refractive index of the said hardened | cured material exists in the said range, the antireflection film obtained will express favorable antireflection function.

((B) organic fine particles)

In the hard coat layer-forming material of the present invention, examples of the organic fine particles used as the component (B) include silicon-based fine particles, melamine-based resin fine particles, acrylic resin fine particles, acrylic-styrene copolymer fine particles, and polycarbonate-based particles. Microparticles | fine-particles, polyethylene microparticles | fine-particles, polystyrene-type microparticles | fine-particles, benzoguanamine type resin fine particles, etc. are mentioned.

In addition, the shape of the organic fine particles is not particularly limited, but in order to exhibit the effect of the present invention that the sedimentation of the organic fine particles is suppressed by the (C) dispersant described later, it is preferable that the organic fine particles have a spherical shape. desirable. The spherical one is also preferable from the viewpoint of homogenizing the anti-glare performance of the hard coat layer and improving reproducibility. It is preferable that the particle size distribution is narrow from the same viewpoint. That is, the organic fine particles are spherical, the average particle diameter is preferably 6 ~ 10㎛ in terms of anti-glare performance, the particle size distribution is within ± 2㎛ average particle diameter measured by the Coulter counter method It is preferable that the weight fraction of the range is 70% or more. In addition, the measuring method of this average particle diameter is demonstrated later.

In this invention, the organic fine particles of this (B) component may be used individually by 1 type, and may be used in combination of 2 or more type, and the said compounding quantity is the above-mentioned (A) component from an anti-glare performance viewpoint. About 100 mass parts of solid content of an active energy ray sensitive composition, Preferably it is 0.1-30 mass parts, More preferably, it is 1-20 mass parts.

In this invention, the hardened | cured material of the active energy ray sensitive composition which is above-mentioned (A) component, and the organic fine particle which is this (B) component can be selected so that it may become various refractive index differences according to the objective. For example, when the antireflection film is a high contrast type, the refractive index difference is preferably a small absolute value of the refractive index difference so that internal haze does not develop, and is preferably 0 to 0.03, more preferably 0. ˜0.02. Moreover, when using an antireflection film as a general purpose type, in order to express internal haze controllably, 0.03-0.2 are preferable and 0.04-0.1 are more preferable. That is, the refractive index difference is generally preferably 0.2 or less, and more preferably 0.1 or less. In addition, the hardened | cured material of an active energy ray sensitive composition and the measuring method of the refractive index of organic particulates are demonstrated 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 a molecule, and examples of the polar group include a carboxyl group, a hydroxyl group, a sulfo group, Primary amino group, secondary amino group, tertiary amino group, amide group, quaternary ammonium base, pyridium base, sulfonium base, phosphonium base, etc. are mentioned. Of these, carboxyl groups, sulfo groups, and primary to tertiary amino groups are preferred. One of these polar groups may be introduced into the molecule, or a plurality of polar groups may be introduced.

In the case of having a plurality of polar groups in a molecule, a component which bonds the compounds having each polar group to each other is required. As such a component, for example, polyoxyalkylene glycol may be mentioned. In such a case, the polar group Will be in the side chain. Although the molecular weight of such a component is not specifically limited, It can select from the broad thing about hundreds to hundreds of thousands.

The dispersing agent which has at least 1 polar group in this molecule suppresses sedimentation of the said organic fine particle in the hard-coat layer whose film thickness is larger than the average particle diameter of organic particle | grains, and makes many of these microparticles exist in the surface vicinity of a hard-coat layer, Has the effect of improving the antiglare performance.

Although it is not necessarily clear about this mechanism, what was shown below 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 is changed, so that the probability that the organic fine particles exist in the vicinity of the surface is increased, and as a result, the film having an average particle diameter of the organic fine particles or more Also in thickness, it is thought that organic microparticles | fine-particles exist in the surface vicinity of a hard-coat layer, and improve anti-glare 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 is mentioned. Moreover, especially as a compound which has this polar group, N, N- dialkylamino alkanol which has a C1-C8 dialkylamino group as a polar group from each alkyl group is especially preferable.

Specific examples of the N, N-dialkylaminoalkanol described above include N, N-dimethylaminoethanol, N, N-diethylaminoethanol, N, N-dipropylaminoethanol, N, N-dibutylaminoethanol, N, N-dipentylaminoethanol, N, N-dihexylaminoethanol, etc., The compound etc. which substituted the ethanol part in these compounds with propanol and butanol are mentioned. In addition, two alkyl groups of the N, N-dialkylamino group part may be 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 is 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-dibutylaminoethanol modified polyoxyalkylene glycol, N, N-dipentylaminoethanol modified polyoxyalkylene glycol, N, N-dihexylaminoethanol modified polyoxyalkylene glycol, etc., and these compounds The compound which substituted the ethanol part of with the propanol, butanol, etc. are mentioned.

In this invention, the dispersing agent of (C) component may be used individually by 1 type, and may be used in combination of 2 or more type. Moreover, the said compounding quantity is preferably with respect to 100 mass parts of solid content of the active energy ray sensitive composition which is above-mentioned (A) component from a viewpoint of the balance of the anti-glare property, abrasion resistance, other physical property, economics, etc. of a hard-coat layer. Is 0.01-10 mass parts, More preferably, it is 0.05-5 mass parts.

(Photoinitiator)

The hard coat layer forming material in this invention can contain a photoinitiator as needed. As this photoinitiator, for example, 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-hydroxycyclohexylphenyl Ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1-one, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl ) Ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-terishali-butylanthraquinone, 2- Aminoanthraquinone, 2-methyl thioxanthone, 2-ethyl thioxanthone, 2-chlorothioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethyl thioxanthone, benzyl dimethyl ketal, acetophenone Dimethylketal, p-dimethylaminobenzoic acid Stud etc. are mentioned.

These may be used 1 type or may be used in combination of 2 or more type, and the said compounding quantity is normally selected in the range of 0.2-10 mass parts with respect to 100 mass parts of all active energy ray hardening-type compounds. In addition, when all the active energy ray hardening-type compounds use reactive silica microparticles | fine-particles as (b) silica type microparticles | fine-particles, it shows what contains this.

(Preparation of hard coat layer forming material)

The hard coat layer forming material used in the present invention is, if necessary, in an appropriate solvent in the active energy ray-sensitive composition of component (A) described above, the organic fine particles of component (B), the dispersant of component (C) and the desired Therefore, the photopolymerization initiator and various additives used, for example, antioxidants, ultraviolet absorbers, silane coupling agents, light stabilizers, leveling agents, antifoaming agents and the like, can be prepared by adding and dissolving or dispersing, respectively, in predetermined ratios. have.

Examples of the solvent used at this time include aliphatic hydrocarbons such as hexane and heptane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and ethylene chloride, alcohols such as methanol, ethanol, propanol, butanol and propylene glycol monomethyl ether. And ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone and cyclohexanone, esters such as ethyl acetate and butyl acetate, and cellosolve solvents such as ethyl cellosolve.

As a density | concentration and a viscosity of the hard-coat layer forming material prepared in this way, as long as it can coat | coat, it will not specifically limit, It can select suitably according to a 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 a hard coat layer forming material prepared as described above.

There is no restriction | limiting in particular about said transparent plastic film, It can select from a plastic film known as a base material of the conventional hard coat film suitably, and can use. 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 and acetyl cellulose. Butylate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyether ether ketone film, Plastic films, such as a polyether sulfone film, a polyetherimide film, a polyimide film, a fluororesin film, a polyamide film, an acrylic resin film, a norbornene-type resin film, and a cycloolefin resin film, are mentioned.

These plastic films may be either transparent or semitransparent, may be colored, or may be non-colored, and may be appropriately selected depending on the intended use. For example, when using it for the protection of a liquid crystal display body, a colorless and transparent film is very suitable.

Although the thickness of these plastic films does not have a restriction | limiting in particular, Although it selects suitably according to a situation, it is 15-300 micrometers normally, Preferably it is the range of 30-200 micrometers. Moreover, this plastic film can be surface-treated by the oxidation method, an uneven | corrugated method, etc. on one side or both sides as needed, for the purpose of improving adhesiveness with the layer formed in the surface. Examples of the oxidation method include corona discharge treatment, plasma treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone and ultraviolet irradiation treatment, and the like. A solvent treatment method and the like. Although these surface treatment methods are suitably selected according to the kind of plastic film, generally, the corona discharge treatment method is used preferably from a viewpoint of an effect, operability, etc. Moreover, a primer layer can also be formed.

[Formation of Hard Coat Layer]

On at least one side of the transparent plastic film, the hard coat layer forming material is 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, a gravure coating method, or the like. It coats, and forms a coating film, and after drying, a hard-coat layer is formed by irradiating an active energy ray to this and hardening the said coating film.

As an active energy ray, an ultraviolet-ray, an electron beam, etc. are mentioned, for example. The ultraviolet light is obtained by 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 50mJ / cm 2, while the electron beam is obtained by an electron beam accelerator or the like, and the irradiation amount is usually 150 ~ 350kV. Among these active energy rays, ultraviolet rays are particularly suitable. In addition, when using an electron beam, a cured film can be obtained without adding a photoinitiator.

In this invention, the thickness of the hard-coat layer formed in this way needs to be larger than the average particle diameter of the organic fine particle used, Therefore, a minimum is about 7 micrometers, and an upper limit is a hard-coat by hardening shrinkage of a hard-coat layer. It is about 20 micrometers from a viewpoint of preventing a film from curling. Preferable thickness is the range of 8-15 micrometers.

[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 having a thickness of 50 to 200 nm or less containing a cured resin by active energy ray irradiation is formed on the hard coat layer thus formed.

The low refractive index layer is, for example, a coating liquid for forming a low refractive index layer containing the polyfunctional (meth) acrylate described in the above-described hard coat layer, preferably porous silica particles, and a photopolymerization initiator as desired. It can form by coating on a hard-coat layer, forming a coating film, irradiating an active energy ray, and hardening the coating film.

The cured resin by irradiation with active energy rays contained in the low refractive index layer is irradiated with active energy rays to the above-described photopolymerization initiator or various additives according to the polyfunctional (meth) acrylate and the desired as described in the hard coat layer. It can be made in the same range as the compounding and physical property.

As the porous silica particles contained in the low refractive index layer, those having a specific gravity of 1.7 to 1.9, a refractive index of 1.25 to 1.36 and an average particle diameter of 20 to 100 nm are preferably used. By using porous silica particles having such properties, an antireflection layer having excellent antireflection performance can be obtained with an antireflection film of one layer type.

In this invention, content of the porous silica particle in this low refractive index layer becomes like this. Preferably it is selected in the range of 30-80 mass%, More preferable content is 50-80 mass%, Especially the range of 60-75 mass% Is preferred. When content of the said porous silica particle exists in the said range, a low refractive index layer will become a layer which has a desired low refractive index, and the antireflection film obtained will be excellent in antireflection property.

The low refractive index layer has a thickness of 50 to 200 nm and a refractive index of 1.43 or less, preferably in the range of 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.

The coating liquid for low refractive index layer used by this invention is the above-mentioned photopolymerization initiator used as needed, the above-mentioned polyfunctional (meth) acrylate, Preferably porous silica particle, In a suitable solvent, Furthermore, various additives, for example, antioxidant, ultraviolet absorber, light stabilizer, leveling agent, antifoaming agent and the like, can be prepared by adding and dissolving or dispersing, respectively, in predetermined ratios.

About the solvent used at this time, it can select from the range equivalent to the solvent mentioned by description of the hard coat layer mentioned above.

As a density | concentration and a viscosity of a coating liquid prepared in this way, as long as it is a coatingable density | concentration and a viscosity, it will not specifically limit, It can select suitably according to a situation.

On the hard coat layer, the coating liquid for low refractive index layer is coated using a conventionally known method, for example, a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, or the like. After forming a coating film and drying, a low refractive index layer is formed by irradiating an active energy ray to this and hardening the said coating film.

The active energy ray used for the formation of the low refractive index layer is the same as the description of the hard coat layer described above.

[Production of Anti-reflective Film]

As a method of manufacturing the antireflection film of the present invention, for example, the following method can be adopted.

First, the hard coat layer forming material is applied to one surface of the transparent plastic film by the above-described method, dried to form a coating film, and then irradiated with an active energy ray and cured to form a hard coat layer. Next, the coating liquid for forming a low refractive index layer is applied to this hard coat layer in the same manner as described above, and after coating and drying to form a coating film, the active energy ray is irradiated and cured to form a low refractive index layer. The antireflection film of the invention can be produced.

In addition, when forming a hard coat layer, an active energy ray is irradiated so that it may become a cured layer about half cured, and at the time of formation of a low refractive index layer, the half-cure cured layer of the said lower layer is completely hardened simultaneously, and a hard coat layer is formed. You can also do it.

[Optical characteristics of antireflection film]

As for the optical characteristic of the antireflection film of this invention formed in this way, a preferable value may differ by this type.

In the case of the high contrast type, the internal haze value is usually 0 to 10%. Even if glare is generated when the internal haze value is within this range, high contrast can be achieved, and therefore, it can be sufficiently applied depending on the kind of display (design concept). If the internal haze value exceeds 10%, high contrast cannot be obtained (general purpose type). In the case of the general-purpose type, the internal haze value is usually 5 to 40%. When the internal haze value is less than 5%, the ability to suppress glare is insufficient, and when it exceeds 40%, visibility is reduced. The preferable internal haze value of the anti-reflection film of the general-purpose type is usually 10 to 35%, 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 the anti-glare 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 the difference between the internal haze value and the total haze value.

Moreover, the reflectance in wavelength 500-700 nm is 4% or less normally, Preferably it is 3% or less, and 60 degree gross | gloss value is 20-95 for both a high contrast type and a general purpose type. If the 60˚ gross value exceeds 95, the surface glossiness is large (high reflection of light), which adversely affects the anti-glare property. If the 60˚ gross value is less than 20, fading occurs well. 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%, there is a possibility that transparency will be insufficient.

In addition, the measuring method of the said optical characteristic value is demonstrated later.

[Other functional layer]

In the antireflection film of the present invention, it is possible to form an antifouling coating layer on the low refractive index layer. This antifouling coating layer is generally applied to a coating liquid containing a fluorine-based resin by 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, a gravure coating method, or the like. It can form by coating on a low-refractive-index layer, forming a coating film, and drying using it.

The thickness of this antifouling coat layer is 1-10 nm normally, Preferably it is the range of 3-8 nm. By forming the antifouling coating layer, the antireflective film obtained has good surface slipperiness and is hardly contaminated. In addition, depending on the type of the antifouling coating layer, it is possible to improve the antistatic property.

[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 opposite to the low refractive index layer of the plastic film. As an adhesive which comprises this adhesive layer, acrylic adhesive, urethane adhesive, and silicone adhesive suitable for optical use are used preferably. The thickness of this adhesive layer is 5-100 micrometers normally, Preferably it is the range of 10-60 micrometers.

Moreover, a peeling sheet can be formed on this adhesive layer as needed. As this peeling sheet, what apply | coated peeling agents, such as a silicone resin, to various plastic films, such as polyethylene terephthalate and polypropylene, etc. are mentioned, for example. 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 having such an adhesive layer is suitably used as a member for imparting antireflection performance, antiglare performance, scratch resistance, and the like to displays such as CRT, LCD, PDP, and the like. It is very suitable for a polarizing plate pasting of.

[Polarizing Plate]

This invention also provides the polarizing plate which has the antireflection film of this invention mentioned above on the surface.

Generally, the liquid crystal cell in LCD arranges the two transparent electrode substrates in which the orientation layer was formed, the said orientation layer inside, and arrange | positioned so that it may become a predetermined clearance gap by a spacer, the periphery is sealed, and a liquid crystal is formed in the said clearance gap. At the same time, the polarizing plate is disposed on the outer surface of the two transparent electrode substrates via the pressure-sensitive adhesive layer.

1 is a perspective view showing a configuration of an example of the polarizing plate. As shown in this figure, the polarizing plate 10 generally has a three-layer structure in which triacetyl cellulose (TAC) films 2 and 2 'are bonded to both sides of a polyvinyl alcohol polarizer 1. And a pressure-sensitive adhesive layer 3 for adhering to an optical component such as a liquid crystal cell on one side thereof. A release sheet 4 is attached to the pressure-sensitive adhesive layer 3. Moreover, the surface protection film 5 is normally formed in the surface on the opposite side to the said adhesive layer 3 of this polarizing plate.

As for the polarizing plate of this invention, it is preferable that the hard-coat layer and low refractive index layer which concern on this invention mentioned above were formed in one TAC film among the TAC films 2 and 2 'formed on both surfaces of the polarizer 1. When the adhesive layer 3, the peeling sheet 4, and the surface protection film 5 are formed in a polarizing plate, the hard coat which concerns on this invention especially on the TAC film 2 'side of the surface protection film 5 side. It is preferable to form a layer and a low refractive index layer.

As a method of manufacturing the polarizing plate of this invention, the operation shown below can be performed, for example.

2 is a cross-sectional schematic diagram which shows the structure of an example of the polarizing plate of this invention.

First, using the film 12 'which does not have an optical anisotropy like a TAC film as a transparent plastic film of a base material, the hard-coat layer 13 and the low refractive index layer 14 which concern on this invention are formed in this one surface, It is set as the antireflection film 15. Next, the TAC film 12 in which the hard coat layer 13 and the low refractive index layer 14 are not formed on one side of the polarizer 11 and the antireflection film 15 on the opposite side are bonded to the adhesive layer 16. , 16 '). When using a TAC film for a transparent plastic film, in order to improve adhesiveness by lamination | stacking by an adhesive agent, a saponification process etc. can also be performed in addition to the surface treatment mentioned above.

Thereby, the polarizing plate 20 excellent in antireflection performance, anti-glare performance, and scratch resistance can be obtained. If necessary, the polarizing plate 20 may also be attached to the surface on which the low refractive index layer 14 is formed, on the surface of the peelable surface protection film 5 shown in FIG. 1 or to an optical component such as a liquid crystal cell on the opposite surface. The adhesive layer 17 and the peeling sheet 18 may be formed.

The polarizing plate of this invention can be used not only for the liquid crystal cell in LCD, but also for light quantity adjustment, a polarization interference application device, an optical defect detector, etc.

<Examples>

Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.

In addition, all the characteristics in each case were calculated | required according to the following method.

<Organic particulates>

(1) Average particle size

Measured by the 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 containing monomer and the content mass ratio was used as the refractive index of the organic fine particles.

<Active energy ray sensitive composition>

(3) the refractive index of the cured product

In each preparation example, the coating agent which consists of an active energy ray sensitive composition (A), a photoinitiator, and a dilution solvent is produced. This was applied to the TAC film (Fuji Film Co., Ltd. product, brand name "TAC80TD80ULH") similarly to the Example, and was used as the hard coat film for refractive index measurement of hardened | cured material. The refractive index of the hard-coat layer was calculated | required using the Abbe Co., Ltd. product Abbe refractometer, and this was made into the refractive index of the hardened | cured material of an active energy ray sensitive composition.

<Low refractive index layer>

(4) refractive index

According to the preparation example 7 mentioned later, the coat agent 7 for low refractive index layers is produced. This was applied to a surface of a 80 μm-thick TAC film (manufactured by Fujifilm Co., Ltd.) so that the cured film thickness was 0.1 μm, and dried in an oven at 70 ° C. for 1 minute, followed by 50 OmJ / cm 2 of a high pressure mercury lamp. Ultraviolet rays were irradiated to form a low refractive index layer.

About the obtained low refractive index layer, the refractive index was calculated | required by the Abbe refractometer (Atago company make, a product name "Abbe refractometer 4T", a Na light source, wavelength: about 590 nm], and made this the refractive index of the low refractive index layer.

<Anti-reflective Film>

(5) Total light transmittance and total haze

Using the Nippon Denshoku Kogyo Co., Ltd. haze meter "NDH-2000", total light transmittance and total haze value are measured based on JISK7136. In addition, total haze value represents the total value of the haze value (internal haze value) resulting from the inside, and the external haze value resulting from the unevenness of the surface.

(6) internal haze and external haze

2 mass parts of isocyanate crosslinking agents [Toyo Ink Corporation product, brand name "BHS-8515"], and 100 mass parts of toluene are added to 100 mass parts of acrylic adhesives [Nippon Carbide company make, brand name "PE-121"], and it is an adhesive solution Was produced. The adhesive solution was apply | coated so that the thickness after drying might be set to 20 micrometers of polyethylene terephthalate [product made from Toyoboseki Co., Ltd., brand name "A4300") of 50 micrometers in thickness, and it dried at 100 degreeC for 3 minutes, and produced the adhesive sheet. The produced adhesive sheet was affixed on the hard coat layer of a hard coat film, and it was set as the sample for internal haze determination. The haze value of the said adhesive sheet and the sample for internal haze determination is measured, and the value which subtracted the haze value of the adhesive sheet from the haze value of the sample for internal haze determination is made into the internal haze value of a hard coat film. In addition, when the internal haze value of the base film (triacetyl cellulose film) and the polyethylene terephthalate film used by the Example and the comparative example were measured similarly, it was less than 0.01% and was a negligible value. The measurement of haze value is the same as said (5).

(7) evaluation of anti-glare properties

The sample which affixed the antireflection film on the acrylic resin board (made by Sumitomo Chemical Co., Ltd.) via an acrylic adhesive is visually observed under a fluorescent lamp, and anti-glare property is evaluated according to the following criteria.

0: antireflection of fluorescent lamp is sufficient, and also less fading

X: The antireflection property of fluorescent lamps is inadequate, or the antireflection property of fluorescent lamps is enough, but discoloration is large and visibility is inferior

(8) 60 degrees grosches

It measures based on JISK7105 using Nippon Denshoku Kogyo Co., Ltd. product gross meter "VG2000".

(9) pencil hardness

In accordance with JIS K 5400, it is measured using the pencil hardness tester "No 553-M1" of Seiki Seisakusho, Yasuda Co., Ltd.

(10) reflectance

Using the Shimadzu Seisakusho Co., Ltd. spectrophotometer "UV-3101 PC", the reflectance in wavelength 500nm, 600nm, and 700nm was measured.

<Preparation Example 1 Coat agent 1 for a hard coat layer>

(A) As an active energy ray sensitive composition, a hard coat agent [JSR Co., Ltd. product, brand name "Opsta Z7524", solid content concentration 70 mass%, the total amount of reactive silica microparticles, and polyfunctional (meth) acrylate 65 mass% 5 mass% of photoinitiator, 30 mass% of methyl ethyl ketone, 1.50] of refractive index of hardened | cured material, and (B) spherical organic fine particle | grains, Acrylic microparticles [Sokken Kagaku Co., Ltd. product, Polymethyl methacrylate tablet ( Iv), an average particle diameter of 3 µm, a refractive index of 1.49] 11.25 parts by mass, (C) a dispersant having a tertiary amine as a polar group [Bikchem Japan Company, trade name "disperbyk103", solid content concentration of 40% by mass] 3 parts by mass 90 mass parts of propylene glycol monomethyl ether was uniformly mixed as a dilution solvent, and the coating agent 1 for hard-coat layers which is about 40 mass% of solid content was prepared. Table 1 shows the formulation of the coating agent, the physical properties of the components, and the like.

<Preparation Example 2 Coat agent 2 for a hard coat layer>

(B) Preparation Example 1 except that the spherical organic fine particles were changed to 11.25 parts by mass of acryl-based fine particles [manufactured by Soken Kagaku Co., Ltd., polymethyl methacrylate tablet, average particle diameter of 5 μm, refractive index of 1.49]. In the same manner, a coating agent 2 for hard coat layer having a solid content of about 40% by mass was prepared. Table 1 shows the formulation of the coating agent, the physical properties of the components, and the like.

<Preparative Example 3 Coat agent 3 for hard coat layer>

(B) Preparation Example 1 except that the spherical organic fine particles were changed to 11.25 parts by mass of acryl-based fine particles (manufactured by Soken Kagaku Co., Ltd., polymethyl methacrylate tablet, average particle diameter 8 µm, refractive index 1.49). In the same manner, coat agent 3 for hard coat layer having a solid content of about 40% by mass was prepared. Table 1 shows the formulation of the coating agent, the physical properties of the components, and the like.

<Preparation Example 4 Coat agent 4 for hard coat layers>

(B) A hard coat having a solid content of about 40% by mass in the same manner as in Preparation Example 1, except that the spherical organic fine particles were changed to 11.25 parts by mass of acryl-based fine particles [manufactured by Soken Kagaku Co., Ltd., average particle diameter: 8 μm, refractive index: 1.55]. Layer coat agent 4 was prepared. Table 1 shows the formulation of the coating agent, the physical properties of the components, and the like.

<Preparation Example 5 Coat agent 5 for hard coat layers>

(B) Hard, which was about 40 mass% of solid content similarly to the preparation example 1 except having changed the spherical organic fine particle into 11.25 mass parts of acryl-type microparticles [made by Soken Kagaku Co., Ltd., average particle diameter: 8 micrometers, refractive index 1.55]. Coat agent 5 for coat layers was prepared. Table 1 shows the formulation of the coating agent, the physical properties of the components, and the like.

<Preparation Example 6 Coat agent 6 for hard coat layers>

Except not having used the (C) dispersing agent, it carried out similarly to the preparation example 1, and prepared the coating agent 6 for hard-coat layers which is about 40 mass% of solid content. Table 1 shows the formulation of the coating agent, the physical properties of the components, and the like.

<Preparation Example 7 Coat agent for low refractive index layer 7>

100 mass parts of polyfunctional (meth) acrylates [Arakawa Kagaku Co., Ltd. product, a brand name "beam set 575CB", solid content 100%], a photoinitiator [Shiba Specialty Chemicals company product, a brand name "Irugacure 907" ] 5 parts by mass is added, followed by methyl isobutyl ketone (MIBK) dispersion of porous silica particles [Shokubai Kasei Kogyo Co., Ltd. product, trade name "ELCOM RT-1002SIV", solid content 21 mass%, porous silica particles: specific gravity 1.8 Refractive index 1.30, average particle diameter 60 nm] After mixing 1200 mass parts, it diluted with MIBK so that the total solid concentration might be 2 mass%, and the coating agent 7 for low refractive index layers was prepared.

Example 1

The coating agent 1 for hard-coat layers obtained by the preparation example 1 was apply | coated so that the cured film thickness might be set to about 100 micrometers on the surface of the triacetyl acetate (TAC) film (The Fujifilm Co., Ltd. product) of 80 micrometers in thickness. After drying for 1 minute in 70 degreeC oven, the ultraviolet-ray of 10mJ / cm <2> was irradiated with the high pressure mercury lamp, and the hard coat layer of the half cured state was obtained. Further, the low-refractive-index layer coating agent 7 obtained in Preparation Example 7 was applied onto the hard coat layer so as to have a cured film thickness of 100 nm, and then dried in an oven at 70 ° C. for 1 minute, followed by 50 OmJ / cm 2 of high-pressure mercury lamp. Ultraviolet rays were irradiated to form a low refractive index layer, and the hard coat layer was completely cured to obtain an antireflection film. The performance of this antireflection film and others are shown in Tables 1 and 2.

Example 2

An antireflection film was obtained in the same manner as in Example 1 except that the coating agent 2 for a hard coat layer obtained in Preparation Example 2 was applied directly to a Mayer so that the cured film thickness was about 10 μm. The performance of this antireflection film and others are shown in Tables 1 and 2.

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 applied directly to a Mayer so that the cured film thickness was about 10 μm. The performance of this antireflection film and others are shown in Tables 1 and 2.

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 applied directly to a Mayer so that the cured film thickness was about 10 μm. The performance of this antireflection film and others are shown in Tables 1 and 2.

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 applied directly to a Mayer so that the cured film thickness was about 10 μm. The performance of this antireflection film and others are shown in Tables 1 and 2.

Comparative Example 1

A hard coat film was obtained in the same manner as in Example 1 except that the low refractive index coat agent 7 obtained in Preparation Example 7 was not applied. The performance of this hard coat film and others are shown in Tables 1 and 2.

Comparative Example 2

A hard coat film was obtained in the same manner as in Example 2 except that the low refractive index layer 7 obtained in Preparation Example 7 was not applied. The performance of this hard coat film and others are shown in Tables 1 and 2.

Comparative Example 3

A hard coat film was obtained in the same manner as in Example 3 except that the low refractive index layer 7 obtained in Preparation Example 7 was not applied. The performance of this hard coat film and others are shown in Tables 1 and 2.

Comparative Example 4

A hard coat film was obtained in the same manner as in Example 4 except that the low refractive index layer 7 obtained in Preparation Example 7 was not applied. The performance of this hard coat film and others are shown in Tables 1 and 2.

Comparative Example 5

A hard coat film was obtained in the same manner as in Example 5 except that the low refractive index layer coating agent 7 obtained in Preparation Example 7 was not applied. The performance of this hard coat film and others are shown in Tables 1 and 2.

Comparative Example 6

An antireflection film was obtained in the same manner as in Example 1 except that the coating agent 6 for the hard coat layer obtained in Preparation Example 6 was applied directly to the Mayer so that the cured film thickness was about 10 μm. The performance of this antireflection film and others are shown in Tables 1 and 2.

[week]

1) Added amount of spherical organic fine particles: Value for solid content of active energy ray-sensitive composition.

2) Cured Resin: A cured product of the active energy ray-sensitive composition.

Thickness of Hard Coat Layer: 10㎛

Thickness of the low refractive index layer: 100 nm

As is clear from Tables 1 and 2, Examples 1 to 5 having a low refractive index layer reduced the reflectance by about 1.5% compared to Comparative Examples 1 to 5 having no low refractive index layer. In Examples 4 and 5, the internal haze can be almost changed without changing the amount of the dispersant, and the external haze value can be changed. In Comparative Example 6, anti-glare property was not expressed in a system in which no dispersant was added.

Example 6

An acrylic pressure-sensitive adhesive layer having a thickness of 25 μm was formed on the TAC film surface side of the antireflective film obtained in Example 1. The polarizer which consists of a film with a thickness of 25 micrometers with which iodine adsorption-aligned to polyvinyl alcohol was bonded on this pressure-sensitive adhesive layer.

On the other hand, the adhesive sheet which has the acrylic pressure-sensitive adhesive layer of thickness 25micrometer on both surfaces of the 80-micrometer-thick TAC film (made by Fujifilm Co., Ltd.) was produced. One side of this adhesive sheet was bonded so that the peeling process surface of a peeling sheet (Lintec Co., Ltd. product, "SP-PET3811") may contact.

Next, it bonded together so that the exposed surface of the said polarizer and the surface on which the peeling sheet of an adhesive sheet is not formed may contact, and the polarizing plate was produced.

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

1: polyvinyl alcohol polarizer 2, 2 ', 12, 12': TAC film
3, 17: adhesive layer 4, 18: release sheet
5: surface protection film 10, 20: polarizing plate
11: polarizer 13: hard coat layer
14: low refractive index layer 15: antireflection film
16, 16 ': adhesive layer

Claims (9)

On the surface of a transparent plastic film, the hard-coat layer formed using the hard-coat layer formation material, and the low-refractive-index layer of 50-200 nm in thickness below refractive index 1.43 containing cured resin by irradiation of an active energy ray are laminated sequentially. As antireflection film made of
(1) An active energy ray-sensitive composition comprising the (A) (a) polyfunctional (meth) acrylate and (b) silica-based fine particles, wherein the hard coat layer-forming material comprises (B) organic fine particles, and ( C) a material containing a dispersant having at least one polar group in a molecule,
(2) the film thickness of the hard coat layer is larger than the average particle diameter of the (B) organic fine particles, and
(3) An antireflection film, wherein the refractive index of the cured product of the active energy ray-sensitive composition (A) is 1.46 to 1.80. The method of claim 1,
(C) The antireflective film characterized by the dispersing agent which has at least 1 polar group in a molecule as a polar group which has at least 1 sort (s) chosen from a functional group which shows acidity, and a 1st-3rd amino group. The method of claim 2,
(C) The antireflection film characterized in that the dispersant having at least one polar group in the molecule has an N, N-dialkylamino group. 4. The method according to any one of claims 1 to 3,
(b) The antireflection film, wherein the silica fine particles are silica fine particles having a group containing a (meth) acryloyl group as a surface functional group. 4. The method according to any one of claims 1 to 3,
(B) The anti-reflective film characterized by the organic fine particle being an average particle diameter of 6-10 micrometers. 4. The method according to any one of claims 1 to 3,
An antireflection film having a refractive index difference of (A) the cured product of the active energy ray-sensitive composition and (B) the organic fine particles is 0.1 or less. 4. The method according to any one of claims 1 to 3,
The low refractive index layer contains 30-80 mass% of porous silica, The antireflection film characterized by the above-mentioned. 4. The method according to any one of claims 1 to 3,
Anti-reflection film, characterized in that the outer haze is less than 20%. The antireflection film as described in any one of Claims 1-3 has on the surface, The polarizing plate characterized by the above-mentioned.

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