KR101466520B1 - Curable resin composition for antistatic layer, optical film, polarizing plate, and display panel - Google Patents

Curable resin composition for antistatic layer, optical film, polarizing plate, and display panel Download PDF

Info

Publication number
KR101466520B1
KR101466520B1 KR1020137000846A KR20137000846A KR101466520B1 KR 101466520 B1 KR101466520 B1 KR 101466520B1 KR 1020137000846 A KR1020137000846 A KR 1020137000846A KR 20137000846 A KR20137000846 A KR 20137000846A KR 101466520 B1 KR101466520 B1 KR 101466520B1
Authority
KR
South Korea
Prior art keywords
layer
antistatic layer
antistatic
optical film
adhesion
Prior art date
Application number
KR1020137000846A
Other languages
Korean (ko)
Other versions
KR20130054314A (en
Inventor
가나 야마모토
도모유키 호리오
Original Assignee
다이니폰 인사츠 가부시키가이샤
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2010157808 priority Critical
Priority to JPJP-P-2010-157808 priority
Application filed by 다이니폰 인사츠 가부시키가이샤 filed Critical 다이니폰 인사츠 가부시키가이샤
Priority to PCT/JP2011/065876 priority patent/WO2012008444A1/en
Publication of KR20130054314A publication Critical patent/KR20130054314A/en
Application granted granted Critical
Publication of KR101466520B1 publication Critical patent/KR101466520B1/en

Links

Images

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements
    • G02B5/3025Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/20Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising esters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/18Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F290/00Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
    • C08F290/02Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
    • C08F290/06Polymers provided for in subclass C08G
    • C08F290/067Polyurethanes; Polyureas
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D151/00Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C09D151/08Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/20Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21Anti-static
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/418Refractive
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/42Polarizing, birefringent, filtering
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/732Dimensional properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00Optical elements
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/04Antistatic
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B2207/00Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
    • G02B2207/121Antistatic or EM shielding layer

Abstract

A curable resin composition for an antistatic layer capable of forming an antistatic layer excellent in antistatic property and adhesion of adjacent HC layers, and an optical film having the antistatic layer. (A) an antistatic agent, (B) a multifunctional monomer having two or more photocurable groups in one molecule and having a molecular weight of 900 or less, and (C) at least six (meth) acryloyl groups in one molecule, (A) is contained in an amount of 1 to 30% by mass based on the total amount of (A), (B) and (C) ) Is in the range of 1 to 40% by mass relative to the total amount of the curable resin composition (C). In addition, the present invention is an optical film provided with a antistatic layer and a hard coat layer of a thickness of 1 to 5 占 퐉, which is composed of a cured product of the curable resin composition for an antistatic layer, from the TAC substrate side on one side of the TAC substrate.

Description

TECHNICAL FIELD [0001] The present invention relates to a curable resin composition for an antistatic layer, an optical film, a polarizing plate, and a display panel,

The present invention relates to an optical film having an antistatic layer provided on the front face of a display (image display device) such as a liquid crystal display (LCD), a cathode-ray tube display (CRT) or a plasma display (PDP) And a polarizing plate and a display panel using the optical film.

In the display as described above, generally, the outermost surface is provided with an optical film composed of layers having various functions such as antireflection property, hard coat property and antistatic property. In the present specification, the hard coat may be simply referred to as " HC ".

As one of the functional layers of such an optical film, an antistatic layer for imparting antistatic properties is known. The antistatic layer may be formed by adding an antistatic agent such as a metal oxide-based conductive superfine particle such as tin oxide (ATO) doped with antimony or tin-doped indium oxide (ITO), a polymeric conductive composition or a quaternary ammonium salt- (For example, Patent Document 1). In the case of using these antistatic agents, a desired function is imparted by forming a thin film layer of about 0.1 to 1 mu m containing an antistatic agent so as to achieve both desired antistatic properties and optical properties (low haze and high total light transmittance) .

Further, in the above-described display, it is required that the image display surface of the display is provided with hardness so as not to be scratched during handling. On the other hand, Patent Document 1 discloses a structure of an optical film in which an antistatic layer of a thin film is provided on a substrate of triacetylcellulose (hereinafter, simply referred to as "TAC") and an HC layer is provided on the antistatic layer Lt; / RTI >

However, since the antistatic layer is a thin film, pentaerythritol triacrylate (hereinafter sometimes simply referred to as " PETA ") or dipentaerythritol hexaacrylate (hereinafter sometimes simply referred to as " DPHA & The amount of the same binder component and antistatic agent is limited and the adhesion of the HC layer adjacent to the antistatic layer tends to be insufficient.

The optical film having the base material / antistatic layer / HC layer as a basic constitution has an interface between the antistatic layer and the HC layer, and an interface between the antistatic layer and the substrate, and there is a problem of adhesion at each interface.

At the interface between the antistatic layer and the HC layer, the reactive groups of the antistatic layer and the HC layer are in close contact with each other, and at the same time, the antistatic layer is required to exhibit antistatic performance. When the antistatic agent is a metal oxide, a large amount of an antistatic agent is added because fine particles of the antistatic agent need to be in close contact with each other in order for the antistatic layer to exhibit antistatic performance. However, haze increases or the total light transmittance deteriorates . However, if the amount of the metal oxide is reduced by giving priority to the optical characteristics, the antistatic performance is hardly exhibited. Further, if the amount of the antistatic agent is increased, the amount of the binder component at the interface between the antistatic layer and the adjacent layer is insufficient, and the adhesion between the antistatic layer and the adjacent layer may be deteriorated. However, if the amount of the metal oxide is reduced with emphasis on the adhesiveness, the antistatic performance is hardly exhibited.

When the antistatic agent is a quaternary ammonium salt, in order for the antistatic layer to exhibit antistatic performance, it is necessary that the quaternary ammonium salt exists in a larger amount than the binder in the layer. Alternatively, it is necessary to exist in the vicinity of the interface adjacent to the HC layer of the antistatic layer. However, in such a case, the quaternary ammonium salt present in the vicinity of the interface inhibits adhesion between the antistatic layer and the HC layer, and the binder component (having a reactive group for increasing the cross-linking density with the HC layer at the interface between the antistatic layer and the adjacent HC layer Component) is insufficient, the adhesion between the antistatic layer and the adjacent HC layer may be deteriorated. However, if the amount of the quaternary ammonium salt is reduced with an emphasis on adhesion, the antistatic performance deteriorates.

In order to achieve both antistatic property and adhesion property, a method of simply increasing the amount of a binder component such as PETA (pentaerythritol triacrylate) or DPHA (dipentaerythritol hexaacrylate) can be considered. However, the amount of such a binder component The larger the thickness of the antistatic layer, the larger the curl (warpage) of the antistatic layer, and the greater the amount of the expensive antistatic agent dispersed in the antistatic layer, thereby increasing the cost . Further, a method of increasing the component having a reactive group in the binder in order to improve the adhesion can be considered. However, as described above, since there is an amount of the antistatic agent necessary for exhibiting the antistatic property and there is a limitation on the amount of the binder, It is difficult to adopt this method.

Further, since the total amount of the binder component and the antistatic agent contained in the antistatic layer as the thin film is limited as described above, the amount of the antistatic agent used is reduced, and the amount of the binder component used is increased to increase the adhesion between the antistatic layer and the HC layer. The use amount of the antistatic agent is reduced and the antistatic performance is lowered.

On the other hand, at the interface between the antistatic layer and the base material, the antistatic layer is in close contact with the base material, so that the binder component of the composition of the antistatic layer penetrates into the base material and the binder component penetrated into the base material at the interface between the base and the antistatic layer, It is necessary that the binder component forming the barrier layer is cured.

In the case where the antistatic agent is a quaternary ammonium salt, it is known to use a substance having a large molecular weight for the purpose of improving durability and antistatic property. However, if the molecular weight of the quaternary ammonium salt is large, the binder component of the composition of the antistatic layer is difficult to penetrate into the substrate. In order to obtain adhesion between the antistatic layer and the substrate, use of a large amount of permeable solvent, It was necessary to use a binder. However, in this case, there is a problem that the adhesion between the antistatic layer and the HC layer is poor.

Further, a technique has been known in the past that enables the prevention of interference fringes by using a permeable solvent to improve the appearance. However, when a permeable solvent is used, a new interface may be formed in the substrate. In addition, There is a problem that appearance is deteriorated due to generation of a pattern.

Japanese Patent Application Laid-Open No. 2009-086660

An object of the present invention is to provide a curable resin composition for an antistatic layer capable of forming an antistatic layer excellent in optical characteristics and appearance and having sufficient antistatic properties and excellent adhesion to adjacent HC layers and TAC substrates As a first object.

Another object of the present invention is to provide an optical film having an antistatic layer formed by using such a composition and having excellent dust adhesion prevention property.

It is a third object of the present invention to provide a polarizing plate having such an optical film.

It is a fourth object of the present invention to provide a display panel having such an optical film.

As a result of intensive studies, the inventors of the present invention have found that a binder component contained in a composition of an antistatic layer and having a relatively low molecular weight such as PETA or DPHA having a molecular weight of 900 or less, which is used for increasing the crosslinking density with an adjacent HC layer, The component penetrates almost all of the TAC substrate or depending on the degree of penetration of the binder component in the depth direction from the interface between the interface with the HC layer on the TAC substrate to the back surface without the HC layer on the TAC substrate, The binder component contained in the antistatic layer on the substrate is reduced and the components reacting at the interface between the HC layer and the antistatic layer are insufficient, so that the adhesion between the antistatic layer and the HC layer may not be sufficiently obtained there was. In addition, if the penetrated portion of the TAC substrate does not penetrate into the gradation and all of the infiltrating material penetrates the TAC substrate to the same depth uniformly, a binder permeation layer is formed in the TAC substrate to cause a new interface in the substrate, It was found that the appearance was deteriorated due to occurrence of a pattern.

Therefore, the inventors of the present invention have found that the antistatic agent contained in the composition, the urethane acrylate having a specific molecular weight which is a binder component that is difficult to penetrate or penetrate into the TAC substrate, and the binder component (multifunctional monomer) It has been found that an antistatic layer having antistatic properties and excellent adhesion to the HC layer and the TAC substrate can be formed and excellent dust adhesion prevention performance can be obtained over the entire optical film, thereby completing the present invention.

That is, the curable resin composition for an antistatic layer according to the present invention for solving the above-

(A) an antistatic agent,

(B) a multifunctional monomer having two or more photocurable groups in one molecule and having a molecular weight of 900 or less and

(C) a urethane acrylate having 6 or more acryloyl groups and / or methacryloyl groups in one molecule and having a weight average molecular weight of 1000 to 11000,

(A) to the total amount of the components (A), (B) and (C) is 1 to 30% by mass,

(C) to the total amount of the components (B) and (C) is 1 to 40% by mass.

By setting the ratio of the antistatic agent (A) within the above range, the antistatic layer having a thickness of 1 to 5 탆 formed by using the composition has sufficient antistatic property, and even when the HC layer is laminated thereon to form an optical film Dust adhesion prevention is ensured.

In view of optical performance and transparency, the thickness of the antistatic layer has been conventionally set to a thickness of about 0.1 to 1 mu m. However, in order to give antistatic properties to such a thin film layer, most of the composition in the layer needs to be an antistatic , It was impossible to add a sufficient amount of a certain amount of a binder having a reactive group necessary for achieving adhesion with the substrate and the layer thereon. Therefore, in the present invention, a binder component having a reactive group other than the antistatic material can be sufficiently added in order to increase the film thickness to some extent and ensure the adhesion between the antistatic layer and the adjacent layer.

By setting the ratio of the urethane acrylate (C) to the total amount of the polyfunctional monomer (B) and the urethane acrylate (C) within the above range, the antistatic layer and the HC layer are formed on the TAC substrate sequentially from the TAC substrate side Since urethane acrylate (C) does not penetrate the TAC substrate or is less permeable than the polyfunctional monomer (B), it is possible to obtain sufficient adhesion between the antistatic layer and the HC layer by the urethane acrylate (C) Since the monomer (B) penetrates the TAC substrate, adhesion between the antistatic layer and the TAC substrate can also be obtained.

In the curable resin composition for an antistatic layer according to the present invention, it is preferable that the antistatic agent (A) is a quaternary ammonium salt having a weight average molecular weight of 1,000 to 50,000, which suppresses the penetration of the antistatic agent into the TAC substrate, desirable.

In the curable resin composition for an antistatic layer according to the present invention, it is preferable that the composition containing (D) a permeable solvent and (E) a non-permeable solvent improve the action of the polyfunctional monomer (B) and the urethane acrylate .

In the curable resin composition for an antistatic layer according to the present invention, the surface resistance value of the cured product having a thickness of 1 to 5 탆 of the curable resin composition for an antistatic layer may be less than 1 × 10 12 Ω / □. The cured product of the curable resin composition for an antistatic layer, that is, the antistatic layer has such an antistatic property that the optical film obtained by laminating the hard coat layer of 5 to 15 탆 on the antistatic layer can exhibit the dust preventing property.

The surface resistance value was measured by forming a cured product (antistatic layer) having a thickness of 1 to 5 占 퐉 of the curable resin composition for an antistatic layer on a TAC substrate and measuring the surface of the cured product with a high resistivity meter (Mitsubishi Chemical Co., Means a value measured under a condition of 24 hours humidification with an applied voltage of 1000 V, temperature of 25 占 폚, and humidity of 40%, manufactured by HiRester IP MCP-HT260).

The optical film according to the present invention is an optical film in which an antistatic layer and a hard coat layer having a thickness of 1 to 5 탆 are provided adjacent to one side of the triacetylcellulose substrate from the side of the triacetylcellulose substrate and the anti- And the cured product of the curable resin composition for an antistatic layer is characterized in that the polyfunctional monomer (B) penetrates and cures in a region near the interface of the antistatic layer side of the triacetylcellulose base.

In the optical film of the present invention in which the antistatic layer and the HC layer having a thickness of 1 to 5 mu m are provided on one side of the TAC substrate from the TAC substrate side, the antistatic layer is a cured product of the curable resin composition for the antistatic layer And has anti-dust adhesion. Further, the adhesion between the HC layer and the antistatic layer is excellent. In addition, since the multifunctional monomer (B) is cured by penetrating into the region on the interface side of the antistatic layer side of the TAC substrate, adhesion between the antistatic layer and the TAC substrate can be obtained. It is possible to obtain excellent dust adhesion prevention performance as a whole of the optical film.

In a preferred form of the optical film according to the present invention, the adhesion ratio of the hard coat layer, the antistatic layer and the triacetylcellulose base material is 90 to 100%, the temperature is 30 占 폚, the humidity is 40% It is also possible to set the adhesion rate after 80 to 100% after irradiating ultraviolet rays at a light amount of 500 W / m 2 per hour for 192 hours.

The adhesion rate of the lattice pattern adhesion test was measured in accordance with JIS K5400 test method of JIS K5400 for an optical film after 24 hours of humidity at a temperature of 25 DEG C and a humidity of 40% 11 gaps were put into each of them to form 100 grid patterns. Cellotape (registered trademark) made by Nichiban Co., Ltd. was attached to the grid pattern, and the grid pattern was quickly pulled out in a direction of 90 DEG to peel off, And the ratio of the remaining non-peeled grid pattern.

Adhesion rate (%) = (number of non-peeled grid patterns / number of grid patterns of total) 100 100

In a preferred form of the optical film according to the present invention, it is also possible to adopt a constitution in which a low refractive index layer is provided on the opposite side of the antistatic layer of the hard coat layer.

In a preferred embodiment of the optical film according to the present invention, the hard coat layer may be a cured product of a composition containing an ionizing radiation curable resin.

The polarizing plate according to the present invention is characterized in that a polarizer is provided on the side of the triacetylcellulose substrate of the optical film.

The display panel according to the present invention is characterized in that a display is disposed on the triacetylcellulose substrate side of the optical film.

A composition containing the antistatic agent (A), the multifunctional monomer (B) and the urethane acrylate (C) at the specified ratios is cured to form an antistatic layer having a thickness of 1 to 5 탆, It is possible to obtain an optical film having sufficient anti-dust adhesion properties and also having good adhesion between the antistatic layer and the TAC substrate and the HC layer even if the layer has the antistatic layer and the HC layer. The composition containing the antistatic agent (A), the multifunctional monomer (B) and the urethane acrylate (C) in the above specific proportions can be suitably used for forming the antistatic layer used in the optical film having such characteristics .

Fig. 1 is a schematic view showing an example of the layer structure of the optical film according to the present invention.
2 is a schematic view showing another example of the layer structure of the optical film according to the present invention.
Fig. 3 is a schematic view showing an example of the layer structure of the polarizing plate according to the present invention.

Hereinafter, the curable resin composition for an antistatic layer according to the present invention (hereinafter, simply referred to as a " composition for an antistatic layer "), an optical film, and a polarizing plate and a display panel using the optical film will be described.

In the present invention, (meth) acryloyl represents acryloyl and / or methacryloyl, and (meth) acrylate represents acrylate and / or methacrylate.

The light of the present invention includes not only electromagnetic waves having wavelengths of visible light, ultraviolet rays, and X-rays but also particle beams such as electron beams and radiation or ionizing radiation collectively referred to as electromagnetic waves and particle beams.

In the present invention, the term "hard coat layer" means a hardness of "H" or higher at a pencil hardness test (4.9 N load) specified in JIS K5600-5-4 (1999).

In the definition of a film and a sheet in JIS-K6900, a sheet refers to a flat product having a thin thickness generally smaller than a length and a width. A film is extremely small in thickness as compared with a length and a width, It is defined as a thin flat product, usually supplied in the form of a roll. Therefore, it can be said that the sheet is particularly thin in thickness among the sheets. However, since the boundary between the sheet and the film is not sure and it is difficult to distinguish clearly, in the present invention, &Quot;

In the present invention, a resin is a concept including a polymer in addition to a monomer or an oligomer, and means a component that becomes a matrix of other functional layers such as an antistatic layer and an HC layer after curing.

In the present invention, the molecular weight means a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) in a THF solvent when having a molecular weight distribution. When the molecular weight distribution does not have a molecular weight distribution, The term compound refers to its molecular weight.

In the present invention, the average particle size of the fine particles means a value measured using a Microtrac particle size analyzer manufactured by Nikkiso Co., Ltd. in the case of fine particles in the composition, and in the case of fine particles in a cured film, Means an average value of 10 particles observed by a transmission electron microscope (TEM) photograph of a cross section.

In the present invention, penetration refers to dissolving or swelling the TAC substrate.

In the present invention, the term "solid component" means a component excluding a solvent.

(Curable resin composition for antistatic layer)

In the curable resin composition for an antistatic layer according to the present invention,

(A) an antistatic agent,

(B) a multifunctional monomer having two or more photocurable groups in one molecule and having a molecular weight of 900 or less and

(C) a urethane acrylate having 6 or more (meth) acryloyl groups in one molecule and having a weight average molecular weight of 1000 to 11000,

(A) to the total amount of the components (A), (B) and (C) is 1 to 30% by mass,

(C) to the total amount of the components (B) and (C) is 1 to 40% by mass.

By setting the ratio of the antistatic agent (A) within the above range, antistatic properties can be imparted to the antistatic layer, and even when the HC layer is formed on the antistatic layer having a thickness of 1 to 5 μm, sufficient dust adhesion prevention is ensured.

Further, by setting the ratio of the urethane acrylate (C) to the total amount of the polyfunctional monomer (B) and the urethane acrylate (C) within the above range, an HC layer is formed on the TAC substrate following the antistatic layer , The urethane acrylate (C) does not penetrate the TAC substrate or is more difficult to permeate than the polyfunctional monomer (B), so that the urethane acrylate (C) also exists at the interface between the antistatic layer and the HC layer, (Meth) acryloyl group of the antioxidant layer (C) and the reactive group in the HC layer are cured and bonded, sufficient adhesion between the antistatic layer and the HC layer can be obtained.

In addition, when the polyfunctional monomer (B) appropriately penetrates the TAC substrate (uniformly penetrates with gradation instead of the same depth), and the reactive group of the penetrating polyfunctional monomer (B) present in the TAC substrate ) And the reactive group of the polyfunctional monomer (B) present in the antistatic layer and the reactive group ((meth) acryloyl group) of the urethane acrylate (C) are cured and bonded so that the adhesion between the antistatic layer and the TAC substrate can be obtained.

Hereinafter, the antistatic agent (A), the multifunctional monomer (B) and the urethane acrylate (C), which are essential components of the composition for an antistatic layer according to the present invention, and other components which may be suitably contained are described do.

(A: antistatic agent)

The antistatic agent (A) is an antistatic agent which prevents the electrification preventing layer or the optical film, which is a cured film of the composition for the antistatic layer, from imparting conductivity to prevent electrification, and adhering dust or waste, That is, an antistatic property.

As the antistatic agent (A), conventionally known antistatic agents can be used, and there is no particular limitation.

For example, cationic compounds such as quaternary ammonium salts and the like described in Patent Document 1, anionic compounds such as sulfonic acid salts and the like, amphoteric compounds such as amino acid compounds, nonionic compounds such as aminoalcohols, organometallic compounds and metal chelate compounds, Conductive ultrafine particles such as a compound obtained by polymerizing these compounds, polymerizable compounds, indium tin oxide (ITO) having an average primary particle diameter of 1 to 100 nm, and polyacetylene of an aliphatic conjugated system.

In the curable resin composition for an antistatic layer according to the present invention, it is preferable that the antistatic agent (A) is a quaternary ammonium salt having a weight average molecular weight of 1,000 to 50,000, that the penetration of the antistatic agent (A) into the TAC substrate is suppressed, Is preferable. If the upper limit is exceeded, the coating performance of the composition deteriorates. If the lower limit is exceeded, the antistatic agent tends to bleed out at the interface with the HC layer of the antistatic layer, and the adhesion between the antistatic layer and the HC layer may be deteriorated.

Conventionally, the antistatic layer is provided with a thin film of about 0.1 to 1 탆 in consideration of optical performance and transparency. However, in order to give antistatic properties to such a thin film layer, most of the composition in the layer needs to be an antistatic material It is very difficult to add a sufficient amount of a resin composition having a reactive group necessary for achieving adhesion with a substrate or a layer on the substrate. Therefore, in the present invention, a resin composition having a reactive group other than the antistatic material can be sufficiently added in order to make the film thickness thicker than the conventional one to make the adhesion between the antistatic layer and the adjacent layer secure . Since the film thickness increases, it is preferable to select a material having high transparency as the antistatic agent to be added. In this respect, an organic material having a higher transparency than an inorganic material is preferable, and a quaternary ammonium salt having an extremely small coloration among organic materials is most suitable. In the case of using a quaternary ammonium salt, in the case where the transparent base material is TAC, the total light transmittance of the entire optical film can be 90% or more. In addition, the haze value can be set to 0.5% or less. The total light transmittance is in accordance with JIS K7361 (1997), and the haze value can be measured by HM150 manufactured by Murakami Color Research Laboratory according to JIS K7136 (2000).

This quaternary ammonium salt has a photo-curable group, which is preferable in that the adhesion between the antistatic layer and the HC layer can be improved by a crosslinking reaction with the binder component of the HC layer. The photocurable group is preferably a polymerizable unsaturated group, more preferably an ionizing radiation curable unsaturated group. Specific examples thereof include a group having an ethylenic unsaturated bond such as a (meth) acryloyl group, a (meth) acryloyloxy group, a vinyl group and an allyl group, and an epoxy group.

Examples of commercially available quaternary ammonium salts having a weight average molecular weight of 1000 to 50000 include trade name H6100 manufactured by Mitsubishi Chemical Corporation and trade name UniLine AS-10 / M manufactured by Shin Nakamura Chemical Industry Co., -12 / M, Uni-resin AS-15 / M and Uni-resin ASH26.

In the antistatic layer composition, the antistatic agent (A) is contained in an amount of 1 to 30% by mass based on the total amount of the antistatic agent (A), the multifunctional monomer (B) and the urethane acrylate (C) described below.

When the proportion of the antistatic agent (A) is less than 1% by mass based on the total amount (A + B + C), sufficient antistatic performance can not be obtained. If the ratio of the antistatic agent (A) to the total amount (A + B + C) exceeds 30 mass%, the ratio of the multifunctional monomer (B) and the urethane acrylate (C) And it becomes impossible to obtain sufficient adhesion with the TAC substrate and the HC layer adjacent to the layer of the antistatic layer.

The ratio of the antistatic agent (A) to the total amount (A + B + C) is 1 to 30% by mass, preferably 5 to 20% by mass.

(B: polyfunctional monomer)

The multifunctional monomer (B) is one kind of binder component which becomes a matrix of an antistatic layer by curing, and is a monomer having a molecular weight of 900 or less and having two or more photocurable groups in one molecule. By having a small molecular weight and a multifunctionality, it is a component contributing to the improvement of the adhesion by improving the cross-link density between the antistatic layer and the HC layer adjacent to the antistatic layer. In addition, at least a part of the polyfunctional monomer penetrates into the TAC substrate and hardens, thereby contributing to the improvement of the adhesion between the antistatic layer and the TAC substrate.

If the molecular weight of the multifunctional monomer (B) exceeds 900, the permeability to the TAC substrate is lowered and there is a fear that sufficient adhesion between the antistatic layer and the TAC substrate can not be obtained.

The molecular weight of the multifunctional monomer (B) may be 900 or less. However, the multifunctional monomer (B) may be suitably infiltrated into the TAC substrate so that the adhesion between the antistatic layer and the HC layer and the antistatic property (surface resistance value) The molecular weight of the polyfunctional monomer (B) is preferably 230 or more, more preferably 290 or more. If the molecular weight is less than 230, penetration of the polyfunctional monomer (B) into the TAC substrate may not be appropriate, and all of them may penetrate to the same depth, resulting in occurrence of a new interface. Light reflected from the interface, The light reflected from the interface of the HC layer and the light reflected from the surface of the HC layer may cause optical interference, resulting in interference fringes, which may deteriorate the appearance.

One or more of the multifunctional monomers (B) may be used.

The photocurable group of the multifunctional monomer (B) is two or more in order to form a crosslinked structure, but preferably has three or more, more preferably five or more. If the number is 3 or more, sufficient adhesion between the antistatic layer, the HC layer and the TAC substrate can be easily obtained. As the photo-curable group, there can be mentioned the same examples as the antistatic agent.

Examples of the polyfunctional monomer (B) include pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, trimethylol propane tri (meth) Trimethylolpropane hexa (meth) acrylate, and modified products thereof.

Examples of the modified substance include EO (ethylene oxide) modified products, PO (propylene oxide) modified products, CL (caprolactone) modified products and isocyanuric acid modified products.

In the polyfunctional monomer, the photocurable group is preferably an acryloyl group rather than a methacryloyl group in view of curing reactivity.

As the polyfunctional monomer (B), dipentaerythritol pentaacrylate (DPPA) and dipentaerythritol hexaacrylate (DPHA) are particularly preferably used.

In the composition for an antistatic layer according to the present invention, the polyfunctional monomer (B) satisfies the above-mentioned content ratio of the antistatic agent and is preferably at least 60% by weight based on the total amount of the polyfunctional monomer (B) and the urethane acrylate To 99% by mass. If it is less than 60% by mass, sufficient adhesion between the antistatic layer, the HC layer and the TAC substrate can not be obtained. On the other hand, if it exceeds 99% by mass, the ratio of urethane acrylate (C) is small and sufficient adhesion between the antistatic layer and the HC layer can not be obtained.

(C: urethane acrylate)

The urethane acrylate (C) is one of the binder components to be cured to become a matrix of the antistatic layer and has 6 or more (meth) acryloyl groups in one molecule and has a weight average molecular weight of 1000 to 11000, 10000, and more preferably 1000 to 5000. [

When the weight average molecular weight is 1000 to 11000, it is preferable that the antistatic layer has a good coating property and is less permeable to the TAC substrate than the polyfunctional monomer (B), and permeation control is easy.

When the antistatic agent (A) is a quaternary ammonium salt, the compatibility of the compound with the hydrophilic compound is good. Therefore, if the binder in the antistatic layer is a compound having an OH group (PETA, PETTA pentaerythritol tetraacrylate, DPPA dipentaerythritol pentaacrylate, or the like), the antistatic agent is excessively dispersed over the entire layer, I will not. Although DPHA does not contain an OH group in its structural formula, it is generally known that it is a mixed compound with a pentafunctional or tetra-functional part in view of difficulty in making it 100% in terms of synthetic functionality. In general, The desired antistatic property could not be obtained.

The urethane acrylate (C), which is a hydrophobic resin, can control the dispersibility. When the antistatic agent (A) is quaternary ammonium salt-based, it is possible to reliably control that the antistatic agent is excessively dispersed in the layer or bleed out in the interface direction with HC because the urethane acrylate (C) can do. The reason why the quaternary ammonium salt is likely to bleed out in the direction of the HC interface is that since the quaternary ammonium salt is hydrophilic, air is present on the surface of the antistatic layer when the antistatic layer is laminated and cured, Because.

By having six or more (meth) acryloyl groups, the cross-link density between the antistatic layer and the reactive group in the HC layer adjacent to the antistatic layer is increased, contributing to the improvement of the adhesion between the antistatic layer and the HC layer. The reactive group of the polyfunctional monomer (B) in the antistatic layer penetrating into the TAC substrate is preferably a (meth) acryloyl group of the urethane acrylate (C) present in the antistatic layer and a point that enhances the crosslinking density with the reactive group of the polyfunctional monomer , The urethane acrylate (C) contributes to the improvement of the adhesion between the antistatic layer and the TAC substrate. In the case of the adhesion, the urethane acrylate (C) is not added and the multifunctional monomer (B) having a plurality of reactive groups other than the antistatic agent (A) It is necessary to control urethane acrylate (C) which is hydrophobic and has a large number of reactive groups in order to prevent the antistatic agent (A) from being dispersed.

Further, the inclusion of the urethane acrylate (C) is also effective in suppressing curling.

When the weight-average molecular weight of the urethane acrylate (C) is less than 1000, the urethane acrylate (C) tends to penetrate the TAC substrate, excessively penetrates the TAC substrate and the acryloyl group at the interface between the antistatic layer and the HC layer The adhesion between the antistatic layer and the HC layer may become difficult to obtain.

When the weight average molecular weight of the urethane acrylate (C) exceeds 11000, there is a fear that the coating workability is deteriorated.

The urethane acrylate (C) may contain other crosslinkable functional groups such as an ionizing radiation-curable unsaturated group if it has 6 or more (meth) acryloyl groups. The (meth) acryloyl group may have 6 or more acryloyl groups and methacryloyl groups, and may have only an acryloyl group or only a methacryloyl group.

The urethane acrylate (C) of the present invention is not particularly limited as long as it has a urethane bond (-NH-CO-O-) and has 6 or more (meth) acryloyl groups and the weight average molecular weight. As the urethane acrylate (C), it is preferable that the urethane acrylate (C) is a translucent material through which light is transmitted when it is used as a coating film, and an ionizing radiation curable urethane acrylate which is a resin which is cured by ionizing radiation typified by ultraviolet rays or electron beams, May be appropriately adopted in accordance with required performance and the like.

Examples of commercially available urethane acrylates include UV1700B (trade name, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), UN3320HS (manufactured by Negami Chemical Industry Co., Ltd.), BS577 (trade name, manufactured by Arakawa Chemical Industry Co., And U15HA, U15H, U9HA, U9H, U6HA and U6H available from Nakamura Chemical Industries Co., Ltd., and the like.

In the composition for antistatic layer of the present invention, the urethane acrylate (C) satisfies the above-mentioned content ratio of the antistatic agent and is 1 to 40 (based on the total amount of the polyfunctional monomer (B) and the urethane acrylate Mass%. If it is less than 1% by mass, sufficient adhesion between the antistatic layer and the HC layer can not be obtained. On the other hand, if it exceeds 40 mass%, the ratio of the polyfunctional monomer (B) is insufficient and sufficient adhesion between the antistatic layer and the TAC substrate can not be obtained.

The proportion of urethane acrylate (C) is 1 to 40% by mass, preferably 5 to 30% by mass, based on the total amount (B + C).

As described above, since the proportion of the polyfunctional monomer (B) and the urethane acrylate (C) in the binder is appropriate, the antistatic agent (A) being excessively dispersed in the antistatic layer is not bleed out, It can be gathered at the level where it can be. This composition makes it possible to reduce the surface low efficiency of the antistatic layer to less than 1 x 10 12 ? / ?.

In addition to the components (A), (B) and (C) described above, the antistatic layer composition may suitably contain a solvent and a polymerization initiator. Hereinafter, these other components will be described.

(solvent)

Examples of the solvent include ketone solvents such as acetone described in Patent Document 1, ester solvents such as methyl acetate, nitrogen-containing solvents such as acetonitrile, glycol solvents such as methyl glycol, ether solvents such as THF, And a glycol ether solvent such as methyl cellosolve may be used as the solvent.

The penetrating solvent is preferably at least one member selected from the group consisting of methyl acetate, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone (MIBK) and cyclohexanone.

In addition, non-permeable solvents such as propylene glycol monomethyl ether (PGME), normal propanol, isopropanol, n-butanol, sec-butanol, isobutanol and tert-butanol may be used.

These solvents may be used alone or in combination of two or more.

In the composition for antistatic layer of the present invention, penetration of the polyfunctional monomer (B) into the TAC substrate is promoted by using a permeable solvent, and the permeability of the antistatic layer and the TAC substrate is improved. .

In the composition for an antistatic layer of the present invention, by using a non-permeable solvent, penetration of the urethane acrylate (C) into the TAC substrate is suppressed, and adhesion between the antistatic layer and the HC layer is improved, It is preferable to use a permeable solvent.

Therefore, in the composition for an antistatic layer of the present invention, it is preferable to use a penetrating solvent when the solvent is a single type, but it is most preferable to use a combination of a permeable solvent and a non-permeable solvent in the case of two or more types of solvents . Although permeation can be controlled by the molecular weight of the urethane acrylate (C) even if only one type (penetrating solvent) is used, it is easier to control permeation than when a permeable solvent and a non-permeable solvent are used in combination, Performance can be obtained.

When the permeable solvent and the non-permeable solvent are used in combination, the mass ratio of the permeable solvent to the non-permeable solvent is 100: 0 to 90:10 to 50:50, and the total solid content of the composition for antistatic layer is 100 parts by mass To 30 parts by mass to 500 parts by mass.

(Polymerization initiator)

The polymerization initiator is a component which initiates or accelerates the crosslinking reaction of the binder component (B). If necessary, conventionally known radicals and cationic polymerization initiators may be appropriately selected and used. As the radical polymerization initiator, for example, Irgacure 184 (1-hydroxy-cyclohexyl-phenyl-ketone) manufactured by Chiba Japan Co., Ltd. is preferably used. When a polymerization initiator is used, the content thereof is preferably 0.4 to 2.0% by mass with respect to the total mass of the total solid content of the antistatic layer composition. By setting the amount of the polymerization initiator used in the antistatic layer composition to 1/10 to 1/2 of the amount of the polymerization initiator used in the HC layer, a large amount of reactive groups in the antistatic layer can be left. As a result, the reaction is difficult to proceed and curling is prevented.

(Preparation of curable resin composition for antistatic layer)

The curable resin composition for an antistatic layer can be obtained by mixing and dispersing the components (A), (B) and (C) in a solvent. Further, when the component (A), component (B) or component (C) has sufficient fluidity even without a solvent, a solvent may not be required. For the mixed dispersion, a known method such as a paint shaker or a bead mill can be used.

In the curable resin composition for an antistatic layer according to the present invention, by setting the antistatic agent (A) in the above-mentioned range, the surface resistance value of the cured product of the curable resin composition for antistatic layer of 1 to 5 μm in film thickness is set to 1 × 10 12 Ω / &Amp; squ & Since the antistatic layer has such an antistatic property, even when the HC layer having a relatively large thickness is laminated, it is possible to exhibit excellent dust adhesion prevention performance in the whole optical film.

When the thickness of the antistatic layer is less than 1 mu m, it is necessary to increase the amount of the quaternary ammonium salt as an antistatic agent in order to maintain the equivalent surface resistance. In this case, the reactive group of the antistatic agent decreases, There is a fear that this will deteriorate.

When the film thickness of the antistatic layer exceeds 5 m, the surface resistance tends to manifest, but curl is generated, and the cost is increased, which may cause deterioration in handling properties.

(A), the polyfunctional monomer (B) and the urethane acrylate (C) in an amount of 5 to 20% by mass, and the urethane acrylate (C) is contained in an amount of 5 to 20% by mass based on the total amount of the antistatic agent ) To 5 to 30 mass% based on the total amount of the multifunctional monomer (B) and the urethane acrylate (C), excellent antistatic property against the ultraviolet (UV) of the adhesion of the optical film can be obtained.

(Optical film)

The optical film according to the present invention is an optical film in which an antistatic layer and a hard coat layer having a thickness of 1 to 5 占 퐉 are provided adjacent to one side of a triacetyl cellulose base material side from the side of the triacetyl cellulose base material and the anti- And the cured product of the curable resin composition for an antistatic layer is characterized in that the polyfunctional monomer (B) penetrates and hardens in a region on the interface side of the antistatic layer side of the triacetylcellulose base.

Even if the antistatic layer is an optical film provided with an antistatic layer and an HC layer of 1 to 5 mu m in thickness from the TAC substrate side on one side of the TAC substrate, the antistatic layer is a cured product of the curable resin composition for the antistatic layer, And the adhesion between the HC layer and the antistatic layer is excellent. In addition, since the multifunctional monomer (B) is cured by penetrating into the region on the interface side of the antistatic layer side of the TAC substrate, adhesion between the antistatic layer and the TAC substrate can be obtained. It is possible to obtain excellent dust adhesion prevention performance as a whole of the optical film.

In a preferred form of the optical film according to the present invention, since the antistatic layer is formed from the cured product of the antistatic layer composition, the antiglare property of the antiglare layer can be improved by using the hard coat layer, the antistatic layer and the triacetylcellulose substrate (Hereinafter referred to simply as " after internal UV test ") at a light intensity of 500 W / m < 2 > per hour at a temperature of 30 DEG C and a humidity of 40% ) Can be made 80 to 100%.

This adhesion shows the adhesion between the HC layer, the antistatic layer and the TAC substrate, that is, the adhesion between the antistatic layer and the HC layer, and the adhesion between the antistatic layer and the TAC substrate.

(A), the multifunctional monomers (B) and the polyfunctional monomers (B) can be obtained even when the conventional binder contains no urethane acrylate (C) and mainly contains only a polyfunctional monomer In the optical film having the antistatic layer composed of the cured product of the composition in which the urethane acrylate (C) is not contained in a specific ratio, adhesion between the antistatic layer and the TAC substrate is good but adhesion between the antistatic layer and the HC layer is insufficient. When the adhesion between the antistatic layer and the HC layer is insufficient, peeling occurs between the antistatic layer and the HC layer, but peeling occurs between the antistatic layer and the HC layer, although peeling does not occur between the antistatic layer and the TAC substrate. If the adhesion between the antistatic layer and the TAC substrate is insufficient, peeling occurs between the antistatic layer and the TAC substrate and peels off. Therefore, in order to obtain excellent adhesion as an optical film, adhesion between the antistatic layer and the HC layer and adhesion between the antistatic layer and the TAC substrate are required.

By forming the antistatic layer by curing the composition for an antistatic layer, adhesion between the antistatic layer and the HC layer of 1 to 5 mu m in thickness is excellent, and adhesion between the antistatic layer and the TAC substrate is excellent, and excellent adhesion as a whole to the optical film is exhibited. In particular, the adhesion is remarkable after the internal UV test. The optical film according to the present invention exhibits excellent adhesion even after an internal UV test.

1 is a schematic view showing an example of the layer structure of the optical film according to the present invention. An antistatic layer 20 and a hard coat layer 30 are provided adjacent to one side of the triacetylcellulose substrate 10 in this order. 2 is a schematic view showing another example of the layer structure of the optical film according to the present invention. A low refractive index layer 40 is further provided on the hard coat layer of the same optical film as in Fig.

Hereinafter, the triacetylcellulose substrate, the antistatic layer and the hard coat layer, which are essential components of the optical film according to the present invention, and the high refractive index layer, the medium refractive index layer, the low refractive index layer, Other layers such as an anti-reflection layer will be described.

(Based on triacetylcellulose)

The triacetylcellulose base material used in the present invention is not particularly limited as long as it satisfies physical properties usable as a light transmissive base material of an optical film and is a triacetylcellulose film having high light transmittance. Of the TAC substrate can be appropriately selected and used.

The average light transmittance of the TAC substrate in the visible light region of 380 to 780 nm is preferably 80% or more, particularly preferably 90% or more. The light transmittance is measured by using a spectrophotometer (for example, trade name UV-3100PC manufactured by Shimadzu Corporation) at room temperature and in the atmosphere.

A surface treatment such as a saponification treatment or a primer layer may be applied to the TAC substrate. An additive such as an antistatic agent may also be added.

The thickness of the TAC substrate is not particularly limited and is usually 30 to 200 占 퐉, preferably 40 to 200 占 퐉.

(Antistatic layer)

The antistatic layer of the present invention comprises a cured product of the curable resin composition for an antistatic layer and has a thickness of 1 to 5 mu m. If the film thickness is thinner than 1 占 퐉, sufficient antistatic properties can not be obtained, and it is not possible to sufficiently add an essential binder for ensuring adhesion with other layers. If the antistatic agent is thicker than 5 m, the antistatic agent can not exert its performance unless it is present in the layer to a certain degree, so that the curl of the antistatic layer becomes large and the workability deteriorates. When the thickness of the antistatic layer increases, And the cost is increased.

As the performance of the antistatic layer, the surface resistance is preferably less than 1 x 10 12 ? /?, More preferably not more than 1 x 10 11 ? / ?, and further not more than 1 x 10 10 ? /. If the surface resistance of the antistatic layer is good, the dust adhesion of the optical film laminated with the HC layer is further improved.

(Hard coat layer)

The hard coat layer is a layer exhibiting a hardness of "H" or higher at a pencil hardness test (load of 4.9 N) specified by JIS K5600-5-4 (1999), and imparts hardness to the optical film of the present invention.

The HC layer is composed of a cured product of a composition for a hard coat layer and may be a conventionally known hard coat layer or may be a cured product of a composition for a hard coat layer containing only a binder component, The composition may contain a polymerization initiator as exemplified in the composition. A component imparting hardness conventionally known for the purpose of increasing the hardness of the HC layer or the like may be included, for example, reactive silica fine particles having a crosslinking reactivity with the binder component described in Japanese Patent Application Laid-Open No. 2008-165040 .

As a specific example, the HC layer can be formed by applying a resin composition containing an ionizing radiation curable resin as a transparent resin to a transparent substrate, and crosslinking and / or polymerizing the monomer, oligomer and prepolymer contained in the resin composition.

The transparent resin is preferably an ionizing radiation curable resin, and the functional group of the monomer, oligomer and prepolymer is preferably an ionizing radiation-polymerizable functional group, and among these, a photopolymerizable functional group is preferable. This functional group is cured with the reactive group of the urethane acrylate (C) in the resin composition for antistatic layer, whereby sufficient adhesion between the antistatic layer and the HC layer can be obtained.

Examples of the photopolymerizable functional group include unsaturated polymerizable functional groups such as (meth) acryloyl group, vinyl group, styryl group and allyl group.

Examples of the prepolymer and oligomer include acrylates such as urethane (meth) acrylate, polyester (meth) acrylate and epoxy (meth) acrylate, unsaturated polyester, and epoxy resin.

Examples of the monomer include styrene-based monomers such as styrene and? -Methylstyrene; (Meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol ethoxytetra (meth) acrylate, pentaerythritol tri (meth) acrylate, (Meth) acrylate, dipentaerythritol penta (meth) acrylate, trimethylol propane tri (meth) acrylate, trimethylol propane ethoxy tri (meth) acrylate, glycerin propoxytriacryl (Meth) acrylate, bisphenol F EO-modified di (meth) acrylate, bisphenol A EO-modified di (meth) acrylate, isocyanuric acid EO-modified di (meth) acrylate, ditrimethylolpropane tetraacrylate, polyethylene glycol di ) Acrylate, isocyanuric acid EO-modified tri (meth) acrylate, polypropylene glycol di (meth) acrylate , Trimethylol propane PO modified tri (meth) acrylate, trimethylol propane EO modified tri (meth) acrylate and ditrimethylol propane tetra (meth) acrylate, trimethylol propane trithioglycolate, trimethylol (Meth) acrylate or polyester (meth) acrylate having two or more unsaturated bonds, and the like can be given as examples of the polyol compound having two or more thiol groups in the molecule such as propanetriethanol, propanetriethioproparate, pentaerythritol tetrathioglycol and the like .

Particularly, polyfunctional acrylate monomers are preferred from the viewpoint of obtaining high scratch resistance by increasing crosslink density. Among them, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa Acrylate and dipentaerythritol penta (meth) acrylate are preferable because they are in close contact with the antistatic layer and the pencil hardness is good. It is also preferable to mix an oligomer component such as a urethane polyfunctional acrylate with these monomers because it is possible to improve the hardness and reduce the polymerization shrinkage so as to improve the curl and crack resistance.

In order to improve the hardness, inorganic fine particles such as silica may be contained in the resin composition. In order to improve compatibility with the resin composition, an organic surface treatment may be performed or a reactive group may be contained.

It is also possible to add a polymer as the binder to the resin composition. Examples of the polymer include polymethyl methacrylate (PMMA) and cellulose acetate propionate (CAP). By adding a polymer, the viscosity of the coating liquid can be adjusted, thereby making it easy to perform the coating process.

A photo radical polymerization initiator may be added to the resin composition, if necessary. The preferable amount is 0.8 to 8.0 mass% with respect to the total mass of the total solid content of the resin composition. As the photo radical polymerization initiator, acetophenones, benzoins, benzophenones, phosphine oxides, ketals, anthraquinones, thioxanthones, azo compounds and the like are used.

Examples of the acetophenones include 2,2-dimethoxyacetophenone, 2,2-diethoxyacetophenone, p-dimethylacetophenone, 1 -hydroxy-dimethylphenylketone, 1 -hydroxy-dimethyl- , 1-hydroxycyclohexyl phenyl ketone, 2-methyl-4-methylthio-2-morpholinopropiophenone, 2-benzyl-2-dimethylamine-1- (4-morpholinophenyl) , 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone and the like. Examples of the benzoin include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzyl dimethyl ketal, Benzoin benzenesulfonic acid ester, benzoin toluenesulfonic acid ester, and the like.

Examples of the benzophenones include benzophenone, hydroxybenzophenone, 4-benzoyl-4'-methyldiphenylsulfide, 2,4-dichlorobenzophenone, 4,4-dichlorobenzophenone and p- '-Dimethylamine benzophenone (Michler ketone), 3,3', 4,4'-tetra (t-butylperoxycarbonyl) benzophenone, and the like can be used.

Further, a photosensitizer may be mixed and used. Specific examples thereof include n-butylamine, triethylamine, and poly-n-butylphosphine.

The film thickness of the HC layer may be appropriately adjusted, and may be, for example, 1 to 20 μm. Preferably 5 to 15 mu m. If it is more than 15 m, excellent dust adhesion prevention performance can not be obtained. If it is less than 5 m, the hardness becomes insufficient and the adhesion becomes weak.

Generally, if the HC layer laminated on the antistatic layer is thickened, dust adhesion prevention performance deteriorates, but if the composition and the composition of the present invention are used, excellent dust adhesion prevention performance can be obtained.

In a preferred embodiment of the optical film according to the present invention, even if a thick HC layer is laminated on the antistatic layer as if the antistatic layer is 1 to 5 占 퐉 and the HC layer is 5 to 15 占 퐉, It is possible to obtain a sufficient adhesion between the antistatic layer and the HC layer.

(Other layers)

In the optical film according to the present invention, in order to improve antireflection property, anti-scattering property and antifouling property of the optical film on the surface opposite to the antistatic layer of the HC layer within the scope of the present invention, Layer, a medium refractive index layer, a low refractive index layer, an antiglare layer, and an antifouling layer may be provided.

(High refractive index layer and medium refractive index layer)

The high refractive index layer and the medium refractive index layer are provided to adjust the reflectance of the optical film according to the present invention. When a high refractive index layer is provided, it is usually provided adjacent to the TAC substrate side of the low refractive index layer (not shown). In the case of providing a medium refractive index layer, the medium refractive index layer, the high refractive index layer and the low refractive index layer are usually provided in this order from the TAC substrate side.

The high refractive index layer and the medium refractive index layer are composed of a cured product of a composition mainly containing a binder component and particles for refractive index adjustment. As the binder component, a polyfunctional monomer exemplified in a composition for an antistatic layer can be used. Examples of the particles for adjusting the refractive index include fine particles having a particle diameter of 100 nm or less. As such fine particles, zinc oxide (refractive index: 1.90), titania (refractive index: 2.3 to 2.7), cerium oxide (refractive index: 1.95), tin doped indium oxide (refractive index: 1.95), antimony doped tin oxide (Refractive index: 1.87), and zirconia (refractive index: 2.0).

The high refractive index layer preferably has a refractive index of 1.50 to 2.80. The medium refractive index layer has a refractive index lower than that of the high refractive index layer, and preferably has a refractive index of 1.50 to 2.00.

The film thickness of the high refractive index layer and the medium refractive index layer may be appropriately adjusted, and is preferably 50 to 300 nm.

(Low refractive index layer)

The low refractive index layer is composed of a composition containing a low refractive index component such as silica or magnesium fluoride and a binder component or a cured product of a low refractive index layer composition containing a fluorine containing resin such as a vinylidene fluoride copolymer, A low refractive index layer can be formed.

The composition for forming the low refractive index layer may contain hollow particles in order to reduce the refractive index of the low refractive index layer. Hollow particles refer to particles having an outer layer and surrounded by an outer layer and having a porous structure or cavity inside. Air (refractive index: 1) is contained in the porous structure or cavity, and the refractive index of the low refractive index layer can be reduced by including hollow particles having a refractive index of 1.20 to 1.45 in the low refractive index layer. The average particle diameter of the hollow particles is preferably 1 to 100 nm. The hollow particles used in the conventionally known low refractive index layer may be used, for example, fine particles having voids described in Japanese Patent Application Laid-Open No. 2008-165040.

When the number average primary particle diameter of the fatty acid metal salt particles is less than the lower limit, problems such as flocculation of the fatty acid metal salt particles and burial of fatty acid metal salt particles on the colored resin particles are liable to occur and adversely affect the printing performance of the toner .

On the other hand, when the number average primary particle size of the fatty acid metal salt particles exceeds the upper limit, the fatty acid metal salt particles are likely to be released from the colored resin particles and the function of the desired external additive (charge stability and fluidity Can not sufficiently be imparted to the toner particles, which may adversely affect the printing performance of the toner.

(Antiglare layer)

The antiglare layer is composed of a cured product of a composition for an antiglare layer containing a binder component and a flame retardant, and a multifunctional monomer exemplified in the antistatic layer composition may be used as the binder component.

Examples of the dispersant include fine particles such as styrene beads (refractive index: 1.59), melamine beads (refractive index: 1.57), and acrylic beads (refractive index: 1.49). It is preferable that the average particle size of the fine particles which impart such antifogging property is 100 to 500 nm. It is preferable that the content of the particulate matter imparting antifogging property is 2 to 30 mass% with respect to the total mass of the binder component contained in the composition for the antiglare layer.

(Pollution prevention layer)

According to a preferred embodiment of the present invention, a contamination preventing layer may be provided on the outermost surface of the optical film opposite to the TAC substrate for the purpose of preventing contamination of the outermost surface of the optical film. It is possible to achieve a new improvement of the antifouling property and the frictional damage property of the optical film by the antifouling layer. The antifouling layer is composed of a cured product of a composition for antifouling layer containing a antifouling agent and a binder component.

As the binder component of the composition for the antifouling layer, conventionally known ones may be used. For example, a multifunctional monomer exemplified in the composition for the antistatic layer can be used.

The antifouling agent contained in the antifouling layer composition may be appropriately selected from antifouling agents such as known leveling agents, and may be used alone or in combination. The content of the antifouling agent is preferably 0.1 to 5% by mass with respect to the total mass of the binder component contained in the antifoulant layer composition.

(Production method of optical film)

The method for producing the optical film of the present invention is not particularly limited as far as the layer structure of the optical film described above can be obtained, and conventionally known methods can be used.

(Ii) a step of preparing a composition for the antistatic layer and a composition for a hard coat layer, (iii) a step of preparing a composition for the antistatic layer on one side of the TAC substrate, (Iv) a step of irradiating a coating film of the composition for an antistatic layer and curing the coating film to form an antistatic layer, (v) a step of applying the composition for a hard coat layer to the antistatic layer to form a coating film , And (vi) a step of irradiating a coating film of the composition for the HC layer and curing the coating film to form an HC layer.

In addition, in the step (iv), the coated layer of the antistatic layer composition is semi-cured (half cure) without completely curing (full cure), and the composition for the HC layer is coated on the half-cured coating film to form a coated film, The cured coating film and the coating film of the composition for the HC layer may be combined and irradiated with light to obtain an optical film by full curing. By using the half-cure method, there is an advantage that the adhesion between the antistatic layer and the HC layer is enhanced.

The coating method may be any conventionally known method. The coating method is not particularly limited, and gravure coating, spin coating, dip coating, spray coating, slide coating, bar coating, roll coating, meniscus coating, Various methods such as LEXO printing method, screen printing method and bead coating method can be used.

Ultraviolet rays, visible light, electron beams or ionizing radiation are mainly used for light irradiation. In the case of ultraviolet curing, ultraviolet rays emitted from light such as ultrahigh pressure mercury lamp, high pressure mercury lamp, low pressure mercury lamp, carbon arc, xenon arc, and metal halide lamp are used. The irradiation dose of the energy source is 50 to 500 mJ / cm < 2 > as the total exposure dose at ultraviolet wavelength 365 nm. The irradiation dose in the case of half-curing is 5 to 50 mJ / cm 2 . In the case of heating in the light irradiation, it is usually treated at a temperature of 40 to 120 ° C.

After the application of the antistatic layer composition, drying may be performed before light irradiation. Examples of the drying method include, for example, a method of drying under reduced pressure or by heating and drying, or a combination thereof. Further, in the case of drying at normal pressure, it is preferable to dry at 30 to 110 ° C. For example, when methyl ethyl ketone is used as a solvent for the composition for an antistatic layer, it is preferably used at a temperature in the range of room temperature to 80 캜, preferably 40 캜 to 70 캜 for 20 seconds to 3 minutes, preferably 30 seconds to 1 Lt; / RTI > min.

An HC layer or a composition such as a low refractive index layer may be prepared by the same method as the above antistatic layer. When a low refractive index layer or the like is provided on the HC layer, the coating method or the curing method of the antistatic layer may be used.

(Polarizer)

The polarizing plate according to the present invention is characterized in that a polarizer is provided on the side of the triacetylcellulose substrate of the optical film. Fig. 3 is a schematic diagram showing an example of the layer structure of the polarizing plate according to the present invention. The polarizing plate 80 shown in Fig. 3 has a polarizer 70 in which an optical film 1, a protective film 50 and a polarizing layer 60 are laminated, and a triacetylcellulose substrate 10 is provided with a polarizer 70. [

The fact that the polarizer is disposed on the side of the triacetylcellulose substrate of the optical film includes not only the case where the optical film and the polarizer are separately formed but also the case where the member constituting the optical film also serves as a member constituting the polarizer .

When the polarizing plate of the present invention is used for a display panel, a display panel is usually disposed on the polarizer side.

Since the optical film described above can be used for the optical film, a description thereof will be omitted. Hereinafter, another configuration of the polarizing plate according to the present invention will be described.

(Polarizer)

The polarizer used in the present invention is not particularly limited as long as it has a predetermined polarization characteristic, and a polarizer generally used in a liquid crystal display device can be used.

The shape of the polarizer is not particularly limited as long as it is capable of retaining predetermined polarization characteristics for a long period of time. For example, the shape of the polarizer may be composed only of a polarizing layer or may be a combination of a protective film and a polarizing layer. In the case where the protective film and the polarizing layer are bonded to each other, a protective film may be formed only on one side of the polarizing layer, or a protective film may be formed on both sides of the polarizing layer.

As the polarizing layer, a film formed of polyvinyl alcohol is generally impregnated with iodine and uniaxially stretched to form a complex of polyvinyl alcohol and iodine.

The protective film is not particularly limited as long as it can protect the polarizing layer and has desired light transmittance. As the light transmittance of the protective film, the transmittance in the visible light region is preferably 80% or more, more preferably 90% or more. The transmittance of the protective film can be measured by JIS K7361-1 (test method for total light transmittance of a plastic-transparent material).

Examples of the resin constituting the protective film include a cellulose derivative, a cycloolefin resin, polymethyl methacrylate, polyvinyl alcohol, polyimide, polyarylate, and polyethylene terephthalate. Among them, it is preferable to use a cellulose derivative or a cycloolefin-based resin.

The protective film may be composed of a single layer or a laminate of a plurality of layers. Further, when the protective film is a laminate of a plurality of layers, a plurality of layers having the same composition may be laminated, or a plurality of layers having different compositions may be laminated.

The thickness of the protective film is not particularly limited as long as the flexibility of the polarizing plate of the present invention can be set within a desired range and the dimensional change of the polarizing plate can be made within a predetermined range by bonding to the polarizing layer. And particularly preferably in the range of 15 to 150 mu m, and more preferably in the range of 30 to 100 mu m. If the thickness is smaller than 5 탆, the dimensional change of the polarizing plate of the present invention may increase. If the thickness is larger than 200 탆, for example, there may be an increase in the processing debris when the polarizing plate of the present invention is cut, or the cutting knife may be quickly worn.

The protective film may have a retardation. By using a protective film having a phase difference, there is an advantage that the polarizing plate of the present invention can have a viewing angle compensation function of a display panel.

The form in which the protective film has a phase difference is not particularly limited as long as it is a form capable of exhibiting desired retardation. Examples of such a configuration include a configuration in which the protective film is composed of a single layer, a configuration having a phase difference by containing an optical characteristic modifying agent exhibiting phase difference, and a configuration having a refractive index anisotropy Having a structure in which a retardation layer containing a compound having a refractive index is laminated. In the present invention, any of these forms can be suitably used.

(Display panel)

The display panel according to the present invention is characterized in that a display is disposed on the triacetylcellulose substrate side of the optical film.

Examples of the display include an LCD, a PDP, an ELD (organic EL, inorganic EL), a CRT, a touch panel, an electronic paper, and a tablet PC.

The display panel according to the present invention can also be used for a touch panel, an electronic paper, a tablet PC, and the like.

The LCD, which is a typical example of the display, is of a transmissive type and comprises a transmissive display body and a light source device for irradiating the transmissive display body from the backside. When the display is an LCD, the polarizing plate having the optical film of the present invention or the optical film of the present invention is disposed on the surface of the transmissive display.

The PDP, which is another example of the display, is provided with a front glass substrate and a rear glass substrate in which a discharge gas is sealed between the front glass substrate and the front glass substrate. When the display is a PDP, the optical film may be provided on the surface of the surface glass substrate or on the front surface plate thereof (glass substrate or film substrate).

The display includes an ELD device for depositing a light emitting material such as zinc sulfide or a diamine material that emits light when a voltage is applied on a glass substrate and controlling the voltage applied to the substrate, or an ELD device for converting an electric signal into light, Or a display such as a CRT that generates a visible image. In this case, the optical film is provided on the outermost surface of the ELD device or the CRT or on the surface of the front face plate.

(Example)

Hereinafter, the present invention will be described in more detail by way of examples. The present invention is not limited to these descriptions.

An antistatic layer composition 1 and a HC layer composition 1 having the following compositions were prepared.

(Composition 1 for antistatic layer)

Antistatic agent (A): UV-ASHC-01 (weight average molecular weight 20000, solid content: 70%, quaternary ammonium salt component: 15% in solid content): 1 part by mass in terms of solid content

Polyfunctional monomer (B): 64 parts by mass of dipentaerythritol hexaacrylate (DPHA) (trade name: KAYARAD DPHA, manufactured by Nippon Kayaku, hexane functionality, molecular weight 578)

Urethane acrylate (C): trade name: BS577 (6-functional, weight average molecular weight 1000), manufactured by Arakawa Chemical Industry Co., Ltd.: 35 parts by mass

Polymerization initiator: Product name of Irgacure 184 (1-hydroxycyclohexylphenylketone): 1 part by mass manufactured by Ciba Specialty Chemicals Co., Ltd. Methyl ethyl ketone: 100 parts by mass

(Composition 1 for HC layer)

, 98 parts by mass of dipentaerythritol hexaacrylate (trade name: KAYARAD DPHA, manufactured by Nippon Kayaku, hexane functionality, molecular weight 578)

Polymerization initiator: Product name of Irgacure 184 (1-hydroxycyclohexylphenylketone): 4 parts by mass, manufactured by Ciba Specialty Chemicals K.K. Methyl ethyl ketone: 100 parts by mass

(Example 1)

A TAC substrate (trade name: TF80UL, manufactured by Fuji Photo Film Co., Ltd.) having a thickness of 80 mu m was prepared, and the antistatic layer composition 1 prepared on one side of the TAC substrate was coated and dried in a heat oven at 70 DEG C for 60 seconds, The solvent was evaporated, and ultraviolet rays were irradiated so that the accumulated light quantity became 50 mJ to cure the coating film, thereby forming an antistatic layer having a thickness of 2.5 m at the time of drying.

Subsequently, the composition 1 for a hard coat layer prepared on the obtained antistatic layer was applied, dried in the same manner as the antistatic layer, and irradiated with ultraviolet rays so that the accumulated light quantity became 150 mJ to harden the coating film, thereby obtaining a hard coat layer Whereby an optical film having an antistatic layer and a hard coat layer in this order from the TAC substrate side was produced on one side of the TAC substrate.

Further, in order to measure the surface resistance value of the antistatic layer, an antistatic layer was formed on the TAC substrate (TF80UL) similarly to the above optical film, and a laminate having only the antistatic layer on one side of the TAC substrate was also prepared.

(Examples 2 to 7)

Except that the amounts or types of the antistatic agent (A), the polyfunctional monomer (B) and the urethane acrylate (C) contained in the composition 1 for antistatic layer in Example 1 were changed as shown in Table 1 An optical film and a laminate were produced in the same manner as in Example 1. The urethane acrylate (C) used in Example 7 is a trade name UV-7610B (manufactured by Japan Synthesis).

(Comparative Examples 1 and 2)

Except that the amounts of the antistatic agent (A), the polyfunctional monomer (B) and the urethane acrylate (C) contained in the composition 1 for antistatic layer in Example 1 were changed as shown in Table 1, 1, an optical film and a laminate were produced.

(Comparative Example 3)

(A) and an antistatic agent (B) were obtained in the same manner as in Example 1 except that the polyfunctional monomer (B) contained in the antistatic layer composition 1 was replaced with an antistatic agent An optical film and a laminate were produced in the same manner as in Example 1 except that the amounts of the functional monomer (B) and the urethane acrylate (C) were changed as shown in Table 1, respectively.

(Comparative Example 4)

(A) and (D) were prepared in the same manner as in Example 1, except that the polyfunctional monomer (B) contained in the antistatic layer composition 1 was replaced with an antistatic agent (A) using DPCA60 (hexafunctional, molecular weight: 1263) manufactured by Nippon Kayaku Co., An optical film and a laminate were produced in the same manner as in Example 1 except that the amounts of the functional monomer (B) and the urethane acrylate (C) were changed as shown in Table 1, respectively.

(Comparative Example 5)

(A), (B) and (C) were obtained in the same manner as in Example 1 except that the urethane acrylate (C) contained in the antistatic layer composition 1 was replaced with EBECRYL270 (bifunctional, molecular weight 1500) An optical film and a laminate were produced in the same manner as in Example 1 except that the amounts of the polyfunctional monomer (B) and the urethane acrylate (C) were changed as shown in Table 1, respectively.

(Comparative Example 6)

(A) and (B) were prepared in the same manner as in Example 1 except that the urethane acrylate (C) contained in the antistatic layer composition 1 was replaced with EBECRYL5129 (hexafunctional, molecular weight 800) An optical film and a laminate were produced in the same manner as in Example 1 except that the amounts of the polyfunctional monomer (B) and the urethane acrylate (C) were changed as shown in Table 1, respectively.

(Comparative Example 7)

(A) and an antistatic agent (B) were obtained in the same manner as in Example 1 except that the urethane acrylate (C) contained in the antistatic layer composition 1 was replaced with BS371MLV (50-function, molecular weight: 20,000) manufactured by Arakawa Chemical Industries, An optical film and a laminate were produced in the same manner as in Example 1 except that the amounts of the functional monomer (B) and the urethane acrylate (C) were changed as shown in Table 1, respectively.

(Comparative Examples 8 to 11)

Except that the amounts of the antistatic agent (A), the polyfunctional monomer (B) and the urethane acrylate (C) contained in the composition 1 for antistatic layer in Example 1 were changed as shown in Table 1, 1, an optical film and a laminate were produced.

(Reference Example 1)

An optical film and a laminate were produced in the same manner as in Example 6 except that the solvent contained in the composition 1 for antistatic layer in Example 6 was replaced by only a non-penetrating solvent.

(Comparative Example 12)

(C) contained in the antistatic layer composition 1 was replaced with caprolactone-modified dipentaerythritol hexaacrylate (trade name: KAYARAD DPCA-60, manufactured by Nippon Kayaku Co., Ltd.) An optical film and a laminate were produced in the same manner as in Example 3 except for the above. This compound tends to be hydrophilic for the same reasons as DPHA.

(Reference Example 2)

The procedure of Example 3 was repeated except that the antistatic agent (A) contained in the antistatic layer composition 1 was replaced with an antistatic agent (B) (metal fine particles: ATO; trade name: ELCOM V3560; An optical film and a laminate were produced.

(Reference Example 3)

An optical film and a laminate were produced in the same manner as in Reference Example 2 except that the amount of the antistatic agent (B) contained in the antistatic layer composition 1 was increased as shown in Table 1 in Reference Example 2.

(Evaluation of surface resistance value of antistatic layer)

(Manufactured by Mitsubishi Chemical Corporation, trade name: Hirester IP MCP-1 manufactured by Mitsubishi Chemical Corporation) was applied to the laminate obtained by laminating the antistatic layer on the substrates of Examples 1 to 7, Comparative Examples 1 to 12 and Reference Examples 1 to 3, HT260) at an applied voltage of 1000V. The results are shown in Table 1. Also, the term "surface resistance value" as used herein means a unit of Ω / square Ω / sq. (Resistance per unit area).

(Evaluation of anti-dust adhesion of optical film)

The HC layer side of the optical laminate composed of the substrate / antistatic layer / hard coat layer prepared in Examples and Comparative Examples was rubbed with a polyester cloth for 20 reciprocations, and the rubbed side was brought close to the tobacco material, Respectively.

?: No adherence of ashes and good dust prevention effect.

X: There are many ashes of the ashes, and there is no dust prevention effect.

(Evaluation of adhesion of optical film)

The optical films of Examples 1 to 7, Comparative Examples 1 to 12, and Reference Examples 1 to 3 were subjected to a humidity control at a temperature of 25 ° C and a humidity of 40% for 24 hours, and then subjected to a grating pattern test according to JIS K5400 100 grid patterns were formed by inserting 11 gaps in the vertical and horizontal directions at intervals of 1 mm and attached to the grid pattern by Nichiban Co., And the adhesion rate was calculated based on the following criteria.

Adhesion rate (%) = (number of non-peeled grid patterns / number of grid patterns of total) 100 100

The optical films of Examples 1 to 7, Comparative Examples 1 to 12, and Reference Examples 1 to 3 were subjected to a humidity control at a temperature of 25 ° C and a humidity of 40% for 24 hours, followed by irradiation of ultraviolet light at a temperature of 30 ° C and a humidity of 40% The adhesion rate after irradiating for 192 hours at a light amount of 500 W / m < 2 > The measurement results of the adhesion of the optical film before and after the UV test are shown in Table 1 together.

Figure 112013003106323-pct00001

(Summary of results)

It can be seen from Table 1 that in Examples 1 to 7, the surface resistance values of all the favorable laminate (antistatic layer) were obtained, and the adhesion of the optical film was good. In addition, the optical characteristics and appearance were good.

However, in Comparative Examples 1 and 2, since the multifunctional monomer (B) and the urethane acrylate (C) were not contained in the composition for the antistatic layer, the adhesion ratio before the UV test was good but the adhesion rate after the UV test This was bad.

In Comparative Example 3, since the multifunctional monomer (B) is monofunctional, a sufficient adhesion rate could not be obtained.

In Comparative Example 4, the molecular weight of the polyfunctional monomer (B) exceeded 1000, the adhesion rate was low, and the adhesion rate after the internal UV test was particularly low. This is presumably because the penetration of the polyfunctional monomer (B) into the TAC substrate was insufficient and the adhesion between the TAC substrate and the antistatic layer became insufficient.

In Comparative Example 5, the number of functional groups of the urethane acrylate (C) was as small as 2, the adhesion rate was low, and in particular, the adhesion rate after the internal UV test was low. This is presumably because the crosslinking by the urethane acrylate (C) is so small that the adhesion between the antistatic layer and the HC layer becomes insufficient.

In Comparative Example 6, the molecular weight of the urethane acrylate (C) was less than 1000, in particular, the adhesion rate after the internal UV test was low. This is presumably because the urethane acrylate (C) excessively penetrated the TAC substrate and the adhesion between the antistatic layer and the HC layer became insufficient.

In Comparative Example 7, the molecular weight of the urethane acrylate (C) exceeded 10,000, the adhesion rate was low, and the adhesion rate after the internal UV test was particularly low. The surface resistance value is also high, which is considered to be because the urethane acrylate (C) does not permeate the TAC substrate at all and the relative amount of the antistatic agent (A) in the antistatic layer is reduced.

In Comparative Example 8, the content ratio of the antistatic agent (A) was small and the surface resistance value became high.

In Comparative Example 9, the content of the antistatic agent (A) was large and the antistatic property was good. However, since the amount of the polyfunctional monomer (B) and the urethane acrylate (C) Low.

In Comparative Example 10, since the content ratio of the polyfunctional monomer (B) was large and the content ratio of the urethane acrylate (C) was small, the adhesion rate was low and the adhesion rate after the internal UV test was low.

In Comparative Example 11, since the content ratio of the urethane acrylate (C) was large and the content ratio of the polyfunctional monomer (B) was small, the adhesion ratio before the UV test was good but the adhesion rate after the UV test was low.

In Reference Example 1, the adhesion rate was low and the surface resistance value was high. This is presumably because the urethane acrylate (C) did not penetrate sufficiently into the TAC substrate because the solvent in the composition for the antistatic layer was made of only the penetrating agent, so that the relative amount of the antistatic agent (A) in the antistatic layer was reduced.

In Comparative Example 12, since the urethane acrylate (C) which is a hydrophobic resin was not used, the quaternary ammonium salt was excessively dispersed and the surface resistance value was high. Therefore, it is also impossible to prevent dust adhesion.

In Reference Example 2, metal fine particles were used as an antistatic agent. The surface resistance value was inferior because the addition amount (significantly less) of the level at which the total light transmittance equivalent to that of the quaternary ammonium salt was obtained.

In Reference Example 3, in order to obtain necessary antistatic property without considering the total light transmittance, since the metal fine particles as the antistatic agent were compounded more than in Reference Example 2, the adhesion was poor. The total light transmittance was lower (88%) and haze (0.8%) was higher than that of quaternary ammonium salt because of the coloring due to the high addition amount.

Dust adhesion prevention properties of the optical films of Examples, Comparative Examples and Reference Examples were evaluated. When the surface resistance value of the laminate was less than 1 x 10 12 ? / Square, all cases were satisfactory. there was. That is, if an antistatic layer having a preferable surface resistance value is laminated on the HC layer, dust adhesion can be imparted to the optical film.

1, 2: Optical film
10: Triacetylcellulose substrate
20: antistatic layer
30: Hard coat layer
40: low refractive index layer
50: Protective film
60: polarizing layer
70: Polarizer
80: polarizer

Claims (12)

  1. delete
  2. delete
  3. delete
  4. delete
  5. An antistatic layer having a thickness of 2.5 to 5 占 퐉 and a hard coat layer having a thickness of 1 to 20 占 퐉 are provided adjacent to one side of the triacetylcellulose substrate from the side of the triacetylcellulose substrate,
    The anti-
    (A) an antistatic agent which is a quaternary ammonium salt having a weight average molecular weight of 1,000 to 50,000,
    (B) a multifunctional monomer having two or more photocurable groups in one molecule and having a molecular weight of 900 or less and
    (C) a urethane acrylate having 6 or more acryloyl groups and / or methacryloyl groups in one molecule and having a weight average molecular weight of 1000 to 11000,
    (A) to the total amount of the components (A), (B) and (C) is 1 to 30% by mass,
    And a cured product of the curable resin composition for an antistatic layer, wherein the ratio of (C) to the total amount of the components (B) and (C) is 1 to 40 mass%
    The polyfunctional monomer (B) penetrates and cures in a region near the interface of the antistatic layer side of the triacetylcellulose base material,
    A haze value of 0.5 or less, and a total light transmittance of 90% or more.
  6. delete
  7. 6. The method of claim 5,
    Wherein the hard coat layer, the antistatic layer and the light amount of the triacetyl cellulose and the adhesion rate of the grid adhesion test between the base material is 90 to 100%, and temperature 30 ℃, 1 hour 500W / m 2 ultraviolet radiation in the humidity of 40% And the adhesion ratio after irradiation for 192 hours is 80 to 100%.
  8. delete
  9. delete
  10. A polarizing plate characterized in that a polarizer is provided on the triacetyl cellulose substrate side of the optical film according to claim 5.
  11. A display panel characterized in that a display is disposed on the triacetylcellulose substrate side of the optical film according to claim 5.
  12. 6. The method of claim 5,
    Wherein the curable resin composition for an antistatic layer further comprises (D) a permeable solvent and (E) a non-permeable solvent.
KR1020137000846A 2010-07-12 2011-07-12 Curable resin composition for antistatic layer, optical film, polarizing plate, and display panel KR101466520B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2010157808 2010-07-12
JPJP-P-2010-157808 2010-07-12
PCT/JP2011/065876 WO2012008444A1 (en) 2010-07-12 2011-07-12 Curable resin composition for antistatic layer, optical film, polarizing plate, and display panel

Publications (2)

Publication Number Publication Date
KR20130054314A KR20130054314A (en) 2013-05-24
KR101466520B1 true KR101466520B1 (en) 2014-11-27

Family

ID=45469442

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020137000846A KR101466520B1 (en) 2010-07-12 2011-07-12 Curable resin composition for antistatic layer, optical film, polarizing plate, and display panel

Country Status (5)

Country Link
JP (1) JP5811090B2 (en)
KR (1) KR101466520B1 (en)
CN (2) CN102958963B (en)
TW (1) TWI482705B (en)
WO (1) WO2012008444A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6235287B2 (en) * 2013-09-30 2017-11-22 日東電工株式会社 Optical laminate

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006306008A (en) 2005-03-31 2006-11-09 Jsr Corp Antistatic layered product
JP2007332181A (en) * 2006-06-12 2007-12-27 Nippon Kasei Chem Co Ltd Antistatic composition, antistatic layer and antistatic film
JP2009086660A (en) * 2007-09-12 2009-04-23 Dainippon Printing Co Ltd Optical layered body, method of producing the same, polarizer and image display device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007116831A1 (en) * 2006-03-31 2007-10-18 Dai Nippon Printing Co., Ltd. Optical laminated body
KR101574351B1 (en) * 2008-09-16 2015-12-03 닛본 페인트 홀딩스 가부시키가이샤 Fingerprint resistant photocurable composition and painted article provided with fingerprint resistant coating layer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006306008A (en) 2005-03-31 2006-11-09 Jsr Corp Antistatic layered product
JP2007332181A (en) * 2006-06-12 2007-12-27 Nippon Kasei Chem Co Ltd Antistatic composition, antistatic layer and antistatic film
JP2009086660A (en) * 2007-09-12 2009-04-23 Dainippon Printing Co Ltd Optical layered body, method of producing the same, polarizer and image display device

Also Published As

Publication number Publication date
JP5811090B2 (en) 2015-11-11
TWI482705B (en) 2015-05-01
CN104530331B (en) 2017-01-11
CN104530331A (en) 2015-04-22
CN102958963B (en) 2014-11-05
CN102958963A (en) 2013-03-06
TW201223758A (en) 2012-06-16
KR20130054314A (en) 2013-05-24
WO2012008444A1 (en) 2012-01-19
JPWO2012008444A1 (en) 2013-09-09

Similar Documents

Publication Publication Date Title
DE60038477T2 (en) Anti-reflection coating, polarizing plate provided therewith, and image display device with the anti-reflection coating or the polarizing plate
US8672492B2 (en) Optical film and method for manufacturing the same, antiglare film, polarizer with optical layer, and display apparatus
JP4271839B2 (en) Antireflection film, polarizing plate, and image display device using the same
JP4552480B2 (en) Hard coat film and method for producing the same
JP5359137B2 (en) Optical laminate, its manufacturing method, polarizing plate, and image display device
US9158044B2 (en) Optical film and display panel
JP5633149B2 (en) Antireflection film and manufacturing method thereof, polarizing plate, transmissive liquid crystal display
WO2007020909A1 (en) Protective film for polarizing plate and polarizing plate
KR100775728B1 (en) Antireflection material and polariging film using the same
JP5540495B2 (en) Curable resin composition for hard coat layer and hard coat film
JP2015102813A (en) Polarizing plate protective film, production method of polarizing plate protective film, polarizing plate, and image display device
JP2004345333A (en) Plastic film and image display device
EP2749916A2 (en) Anti-glare film
JP2010122323A (en) Optical sheet and method of manufacturing the same
JP5531509B2 (en) Optical laminate, polarizing plate, and image display device
KR101470465B1 (en) Hard coating film
JP4836316B2 (en) Antireflection film, polarizing plate, and image display device
JP4853181B2 (en) High refractive index hard coat layer
KR101470466B1 (en) Laminated hard coating film
TWI390240B (en) An optical laminate having a low refractive index
JP5381570B2 (en) Method for producing hard coat film, hard coat film, polarizing plate and display panel
JP5407545B2 (en) Anti-glare film, method for producing the same, and display device
JP4135232B2 (en) Hard coat film or sheet
JP2008012675A (en) Optical laminate and its manufacturing method
KR20050031919A (en) Article having a hardcoating layer having improved sliding property

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20171110

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20181113

Year of fee payment: 5