KR20180136575A - Optical film, anti-glare film, and polarizing plate - Google Patents

Abstract

An acrylic resin composition comprising 100 parts by weight of an acrylic resin composition and 0.01 to 0.09 part by weight of a lubricant, wherein the acrylic resin composition comprises a transparent acrylic resin and rubber elastomer particles having an average particle diameter of 10 to 300 nm, The content of the rubber elastomer particles is 25 to 45 wt% in the acrylic resin composition. An antiglare layer may be formed on the optical film to form a flicker-resistant film. The optical film or the antireflection film may be bonded to a polyvinyl alcohol polarizing film to form a polarizing plate or a polarizing plate.

Description

OPTICAL FILM, ANTI-GLARE FILM, AND POLARIZING PLATE

The present invention relates to an optical film which is preferably used as a protective film of a polyvinyl alcohol polarizing film constituting a polarizing plate, a polarizing film in which an antiglare layer is formed in the optical film, and a polarizing film, To a polarizing plate.

BACKGROUND ART [0002] A polarizing plate is widely used mainly in constituent members of a liquid crystal display device. The polarizing plate usually flows in a state in which a protective film is laminated on at least one surface of a polarizing film made of a polyvinyl alcohol resin, and is incorporated in a liquid crystal display device or the like. Traditionally, a triacetyl cellulose film has been used as a protective film of a polyvinyl alcohol polarizing film constituting such a polarizing plate. However, triacetylcellulose has insufficient resistance to humidity and humidity, and the polarizing plate using the triacetylcellulose film as a protective film sometimes has deteriorated performance such as polarization and color under high-temperature and high-humidity conditions.

Therefore, as a protective film replacing triacetyl cellulose, use of an acrylic resin excellent in transparency and heat and humidity resistance has been studied. For example, in JP2007-25008-A, a thermoplastic resin layer capable of being peeled off is formed on both sides of the acrylic resin layer with a thickness of 40 占 퐉 or less, and the thermoplastic resin layers on both surfaces are peeled off before use, . In JP 2007-41563-A, a protective film made of a three-layer structure of an acrylic resin film / polyethylene imine layer / polyvinyl alcohol resin layer is bonded to a polyvinyl alcohol polarizing film on the polyvinyl alcohol resin layer side, . JP2007-52404-A discloses that a polarizing plate is formed on one side of a polyvinyl alcohol polarizing film in the order of an adhesive layer / a metal salt layer / a protective film, and that the protective film is composed of an acrylic resin . JP2009-25762-A discloses that 0.1 to 1.5 parts by weight of a lubricant composed of a metal salt is blended with 100 parts by weight of a resin component mainly composed of an acrylic resin as a protective film for a polarizing plate. Further, JP2009-163216-A discloses a polarizing plate which is laminated on one side of a polyvinyl alcohol polarizing film with a light-scattering film made of an acrylic resin film having a hard coat layer to be disposed on the visual side of the liquid crystal display And that the acrylic resin constituting the antifogging film preferably contains acrylic rubber particles from the viewpoint of impact resistance and film formability of the film.

When an acrylic resin is used as an optical film including a protective film of a polyvinyl alcohol polarizing film, it is important to increase the slipperiness of the film surface in order to improve workability and productivity. That is, the film is not limited to optical use but is generally wound around a columnar core after production and stored in a roll form. As a result, if the slip property of the film surface is poor, the film is tightened in a wound state after being stored for a predetermined period, There is a case where a phenomenon called a wound tightening, in which a depression is observed on the outermost surface, is generated. If such a winding tightening occurs, the dents and the like become defective, and it is virtually impossible to apply the film to an optical film.

Thus, in JP2009-25762-A mentioned above, 0.1 to 1.5 parts by weight of a lubricant composed of the metal salt is added to 100 parts by weight of the resin component after specifying the lubricant to the metal salt for the purpose of improving the slip property of the film surface have. In JP2004-151573-A, 0.01 to 1.0 part by weight of the inorganic fine particles and 0.01 to 1.0 part by weight of the lubricant are added to 100 parts by weight of the alicyclic structure-containing resin represented by the norbornene resin as a representative example, Are each blended in a proportion of 0.1 to 0.8 parts by weight to increase the slipperiness of the film surface. The prescription disclosed in JP2004-151573-A is to form irregularities on the surface of the film by the inorganic fine particles and to further increase the slip property by the lubricant, and also with respect to the acrylic resin, the inorganic fine particles and the lubricant So as to increase the slipperiness of the film surface.

However, when the slipperiness of the film surface is increased by the presence of the lubricant in the resin constituting the film, the transparency of the film may be lowered, or the lubricant may bleed out from the film and the white powder may float on the surface There is a case where a problem occurs. Further, when concave and convex portions are formed on the surface of the film by the presence of the inorganic fine particles in the resin constituting the film, there is a possibility that the inorganic fine particles are accumulated in the production apparatus in the production process of the film. Therefore, there is a possibility that productivity is lowered due to clogging of the apparatus or process contamination.

One of the objects of the present invention is to provide an optical film which is mainly composed of an acrylic resin and which is blended with rubber elastomer particles to improve the impact resistance and film formability of the film, It is on. It is still another object of the present invention to provide an optical film which is also preferably used as a protective film of a polarizing film by imparting ultraviolet absorbing ability to the optical film. It is still another object of the present invention to provide a light-shielding film in which an antiglare layer is formed on these optical films. It is still another object of the present invention to provide a polarizing plate in which these optical films or retardation films are bonded to a polarizing film as a protective film so that the optical films or the retardation film are hardly tightened when they are rolled.

The inventors of the present invention found that when a small amount of an activator is mixed with an acrylic resin composition in which a predetermined amount of rubber elastomer particles are blended with an acrylic resin as a main component, the slip property when formed into a film is improved, And the bleed-out of the lubricant can be suppressed. Thus, the present invention has been accomplished.

That is, the present invention includes the following.

[1] An optical film comprising a resinous active material composition comprising 100 parts by weight of an acrylic resin composition and 0.01 to 0.09 part by weight of a lubricant, wherein the acrylic resin composition comprises a transparent acrylic resin and rubber elastomer particles having an average particle diameter of 10 to 300 nm And the content of the rubber elastomer particles is 25 to 45% by weight in the acrylic resin composition.

[2] The optical film according to [1], wherein the lubricant is a stearic acid compound.

[3] The optical film according to [1] or [2], wherein the ultraviolet absorber is contained in the resin binder composition and the transmittance of the optical film at a wavelength of 380 nm is 25% or less.

[4] A retardation film having an antiglare layer formed on the surface of the optical film according to any one of [1] to [3].

[5] The antiglare layer is formed of a composition comprising 100 parts by weight of a transparent resin and 3 to 30 parts by weight of fine particles having an average particle diameter of 0.5 to 5 μm and a difference in refractive index from the transparent resin of 0.02 to 0.2, And the retardation film according to [4].

[6] A polarizing plate comprising a polarizing film made of a polyvinyl alcohol resin and an optical film according to any one of [1] to [3] bonded to the polarizing film.

[7] A polarizing plate comprising a polarizing film made of polyvinyl alcohol resin and a polarizing film laminated on the opposite side of the antiglare layer to the polarizing film according to [4] or [5].

In the optical film of the present invention, when a certain amount of rubber elastic particles having a predetermined average particle size is mixed with a transparent acrylic resin and a small amount of the lubricant is added, the slipperiness of the film surface is improved. Therefore, when the film is made into a roll type, the film is hardly tightened, and the productivity is excellent. When a transparent acrylic resin is blended with an ultraviolet absorber together with rubber elastomer particles and a lubricant to give an ultraviolet absorbing ability, it is further preferable as a protective film of a polarizing film. These optical films or the light-shielding films having the antiglare layer formed thereon are useful as protective films for polyvinyl alcohol polarizing films, and polarizing plates formed by bonding these optical films or the light-shielding films to the polarizing films are also wound Tightness is hardly generated, and the productivity is excellent.

Further, as another effect of the present invention, the rubber elastomer particles are added to the acrylic resin, whereby the surface of the film is slightly irregularly formed to improve the slipperiness of the surface of the film, so that the addition amount of the lubricant can be reduced, It is possible to suppress the bleed-out of the lubricant.

(Optical film)

The optical film of the present invention is composed of a resinous active material composition comprising 100 parts by weight of an acrylic resin composition and 0.01 to 0.09 part by weight of a lubricant, wherein the acrylic resin composition comprises a transparent acrylic resin and a rubber elastomer particle having an average particle diameter of 10 to 300 nm And the content of the rubber elastomer particles is 25 to 45% by weight in the acrylic resin composition.

(Acrylic resin)

The acrylic resin is usually a polymer mainly comprising alkyl methacrylate. Specifically, it may be a homopolymer of alkyl methacrylate or a copolymer using two or more alkyl methacrylates, or even a copolymer of not less than 50% by weight of alkyl methacrylate and not more than 50% by weight of monomers other than alkyl methacrylate good. As the alkyl methacrylate, the alkyl group having 1 to 4 carbon atoms is usually used, and among these, methyl methacrylate is preferably used.

The monomers other than alkyl methacrylate may be monofunctional monomers having one polymerizable carbon-carbon double bond in the molecule or multifunctional monomers having two or more polymerizable carbon-carbon double bonds in the molecule, Monofunctional monomers are preferably used. Examples thereof include alkyl acrylates such as methyl acrylate and ethyl acrylate, styrene monomers such as styrene and alkyl styrene, and unsaturated nitriles such as acrylonitrile and methacrylonitrile. When alkyl acrylate is used as the copolymerization component, the alkyl group usually has about 1 to 8 carbon atoms. The monomer composition of the acrylic resin is preferably not less than 70% by weight, more preferably not less than 80% by weight, and even more preferably not less than 90% by weight, based on the total amount of the monomers, 99% by weight or less.

It is preferable that the acrylic resin does not have a glutarimide derivative, a glutaric acid anhydride derivative, a lactone ring structure or the like. An acrylic resin having a cyclic structure such as a glutarimide derivative, a glutaric acid anhydride derivative or a lactone ring structure tends to have difficulty in obtaining sufficient mechanical strength and moist heat resistance as an optical film. In other words, the acrylic resin is a polymer in which the monomer is substantially composed of only alkyl methacrylate, or alkyl methacrylate accounts for 70% by weight or more, preferably 90% by weight or more, of the monomer composition, Is a copolymer of only monomers selected from alkyl acrylates, styrene monomers and unsaturated nitriles.

(Rubber elastomer particles)

The rubber-like elastomer particles contained in the acrylic resin composition and constituting the acrylic resin composition are particles containing a layer exhibiting rubber elasticity.

The rubber elastomer particles may be particles composed only of layers exhibiting rubber elasticity, or may be particles of a multi-layer structure having other layers together with the layer exhibiting rubber elasticity. Examples of the rubber elastomer include an olefin elastomer, a diene elastomer, a styrene-diene elastomer copolymer, and an acrylic elastomer. Among them, an acrylic elastomer is preferably used from the viewpoint of surface hardness, light fastness and transparency of the optical film.

The acrylic elastomer can be composed of a polymer mainly composed of an alkyl acrylate. This may be a homopolymer of alkyl acrylate or a copolymer of 50 wt% or more of alkyl acrylate and 50 wt% or less of other monomers. As the alkyl acrylate, usually, the alkyl group having 4 to 8 carbon atoms is used. When a monomer other than alkyl acrylate is copolymerized, examples thereof include alkyl methacrylates such as methyl methacrylate and ethyl methacrylate, styrene monomers such as styrene and alkyl styrene, acrylonitrile and methacrylonitrile Unsaturated nitrile and the like; unsaturated carboxylic acids such as allyl (meth) acrylate and methallyl (meth) acrylate; dialkyl esters of dibasic acid such as maleic acid diallyl; alkylene glycol di Unsaturated carboxylic acid diesters of glycols such as methacrylic acid and methacrylic acid.

The rubber elastomer particles containing an acrylic elastomer are preferably particles of a multilayer structure having a layer of an acrylic elastomer. Specifically, there is a two-layer structure having a hard polymer layer mainly composed of alkyl methacrylate on the outer side of the acrylic elastic body, and a three-layer structure having a rigid polymer layer mainly composed of alkyl methacrylate on the inner side of the acrylic elastic body Layer structure. Examples of the monomer composition in the polymer mainly composed of alkyl methacrylate constituting the hard polymer layer formed on the outer side or the inner side of the acrylic elastic body are the same as those of the acrylic polymer The composition of the monomers is the same as that of the monomer composition. In particular, a monomer composition mainly composed of methyl methacrylate is preferably used. The acrylic rubber elastomer particles having such a multi-layer structure can be produced, for example, by the method described in JPS55-27576-B.

In the present invention, as the rubber elastomer particles, rubber elastomer layers contained therein have an average particle diameter of 10 to 300 nm. This makes it possible to obtain a protective film which is difficult to peel off from the adhesive layer when bonded to the polarizing film using an adhesive. The average particle diameter of the rubber elastomer particles is preferably 50 nm or more, and more preferably 250 nm or less.

The average particle diameter of the rubber elastomer particles containing the acrylic elastomer is measured as follows. That is, when such rubber elastomer particles are mixed with an acrylic resin and made into a film and the cross section thereof is dyed with an aqueous solution of ruthenium oxide, only the rubber elastomer layer is colored and observed in a nearly circular shape, and the acrylic resin in the parent layer is not dyed. Thus, from the cross-section of the thus-dyed film, a flake is prepared using a microtome or the like, and the flake is observed with an electron microscope. Then, 100 dyed rubber elastomer particles are randomly extracted to calculate the respective particle diameters, and the number average value is taken as the average particle diameter. Since the measurement is carried out by such a method, the average particle diameter of the rubber elastic body specified in the present invention is the number average particle diameter.

When the outermost layer is a hard polymer mainly composed of methyl methacrylate and rubber elastomer particles surrounding the acrylic elastomer are used, when the rubber elastomer particles are mixed with the acrylic resin of the matrix, the outermost layer of the rubber elastomer particles is the acrylic polymer It is miscible with resin. Therefore, when the cross section is dyed with ruthenium oxide and observed with an electron microscope, the rubber elastomer particles are observed as particles with the outermost layer removed. Specifically, in the case of using a rubber elastomer particle having a two-layer structure in which the inner layer is an acrylic elastomer and the outer layer is a hard polymer mainly composed of methyl methacrylate, the acrylic elastomer portion of the inner layer is dyed, And the innermost layer is a hard polymer mainly composed of methyl methacrylate, the middle layer is an acrylic elastomer, and the outermost layer is a hard polymer mainly composed of methyl methacrylate, The particle center portion of the innermost layer is not dyed and only the acrylic elastomer portion of the intermediate layer is observed as a dyed two-layer structure particle.

Such rubber elastomer particles are compounded in a proportion of 25 to 45% by weight based on the acrylic resin composition (the total amount of the transparent acrylic resin and rubber elastomer particles). By blending the rubber elastomer particles in this ratio, the film-forming property to the film is enhanced, the impact resistance of the obtained optical film is enhanced, and furthermore, the surface of the film is slightly irregularly formed.

(Lubricant)

In the present invention, a resinous active material composition is prepared by adding a small amount of a lubricant to an acrylic resin composition prepared by mixing a predetermined amount of rubber elastomer particles with the above-mentioned acrylic resin, and then the optical film is formed. The lubricant used for this purpose may be one having a function of improving the slipperiness of the acrylic resin film surface. Examples of the compound having such a function include a stearic acid compound, an acrylic compound and an ester compound. Among them, in the present invention, a stearic acid-based compound is preferably used as a lubricant.

Examples of the stearic acid-based compound to be a lubricant include stearic acid esters such as methyl stearate, ethyl stearate and monoglyceride stearate in addition to stearic acid itself; Stearamide; Stearic acid metal salts such as sodium stearate, calcium stearate, zinc stearate, lithium stearate, and magnesium stearate; Hydroxystearic acid such as 12-hydroxystearic acid, sodium 12-hydroxystearate, zinc 12-hydroxystearate, calcium 12-hydroxystearate, lithium 12-hydroxystearate and magnesium 12- And the like. Among them, stearic acid is preferably used in the present invention.

The blending amount of the lubricant is set in the range of 0.01 to 0.09 parts by weight with respect to 100 parts by weight of the acrylic resin composition (total of acrylic resin and rubber elastomer particles). A more preferable blending amount of the lubricant is 0.03 parts by weight or more and 0.07 parts by weight or less based on 100 parts by weight of the acrylic resin composition. If the blending amount of the lubricant is less than 0.01 part by weight based on 100 parts by weight of the acrylic resin composition, sufficient slipperiness of the film surface can not be obtained and winding tightness tends to occur. On the other hand, if the blending amount exceeds 0.09 parts by weight, the lubricant may bleed out from the film or the transparency of the film may be deteriorated.

The resinous resin composition in which the rubber-based elastomer particles and the lubricant are blended with the acrylic resin may be finally formed as described above, and the production method thereof is arbitrary. For example, first, rubber elastomer particles are produced, and then the monomer as a raw material of the acrylic resin is polymerized in the presence of the acrylic elastomer particles to form an acrylic resin of the matrix to obtain an acrylic resin composition containing rubber elastomer particles. A method of mixing rubber elastomer particles and an acrylic resin to prepare an acrylic resin composition having a predetermined composition, adding a predetermined amount of an activator thereto, and mixing the resultant by melt kneading or the like.

(Ultraviolet absorber)

The resinous resin composition to which the lubricant is blended in the acrylic resin composition used in the present invention is preferably a resin composition containing an ultraviolet absorber and having an ultraviolet absorbing ability when the film is used as a polarizer. That is, the liquid crystal display device, which is intended as a main application of the polarizing plate of the present invention, has a liquid crystal panel in which a polarizing plate is bonded to both surfaces of the liquid crystal cell as a main component. The liquid crystal material sealed in the liquid crystal cell is deteriorated by ultraviolet rays There are many cases. Since external light including sunlight is reflected on the viewer side of the liquid crystal panel and light from the backlight is reflected on the backside of the liquid crystal panel and both ultraviolet rays are contained in the liquid crystal panel, imparting ultraviolet absorption capability to the polarizer prevents deterioration of the liquid crystal material in the liquid crystal cell .

The ultraviolet absorber is a compound which absorbs ultraviolet rays having a wavelength of 400 nm or less. When the optical film of the present invention is used as a protective film of a polyvinyl alcohol polarizing film, an effect of improving the durability of the polarizing plate to which the protective film is bonded to the polarizing film can be obtained by blending an ultraviolet absorber. Similarly, an effect of protecting the liquid crystal material in the liquid crystal cell in which the polarizing plate is disposed can also be obtained. As the ultraviolet absorber, known ones such as benzophenone ultraviolet absorber, benzotriazole ultraviolet absorber, acrylonitrile ultraviolet absorber and the like can be used. Specific examples thereof include 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol] Butylphenyl) -5-chlorobenzotriazole, 2,4-di-tert-butyl-6- (5-chlorobenzotriazol- 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2 ', 4,4'-tetrahydroxybenzophenone, and the like. Among them, a benzotriazole-based ultraviolet absorber is preferable, and for example, 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol- ) Phenol] is one of the preferred ultraviolet absorbers.

The blending amount of the ultraviolet absorber can be selected within a range that the transmittance at the wavelength of 370 nm or less of the optical film is preferably 10% or less, more preferably 5% or less, further preferably 2% or less. It is also preferable to blend the ultraviolet absorber so that the transmittance of the optical film at a wavelength of 380 nm is 25% or less, more preferably 15% or less, particularly 7% or less. The blending amount of the ultraviolet absorber may be determined so that the transmittance of the optical film satisfies the conditions shown here. Specifically, the blending amount of the ultraviolet absorber may be determined, for example, by 0.1 to 2.5 wt% based on 100 parts by weight of the acrylic resin composition (total of acrylic resin and rubber elastomer particles) Preferably about 0.5 to 2 parts by weight, the amount of the ultraviolet absorbing agent is preferably determined so as to satisfy the transmittance. Examples of the method of incorporating an ultraviolet absorber include a method of blending an ultraviolet absorber into an acrylic resin and pelletizing it in advance and molding the resultant into a film by melt extrusion or the like, a method of directly adding an ultraviolet absorber during melt extrusion molding, and the like , Any method can be used.

(Optional component of the resin composition)

The composition containing the resin composition in which the rubber-based elastomer particles and the lubricant are blended with the acrylic resin or the ultraviolet absorber may further contain additives such as a fluorescent whitener, a dispersant, a heat stabilizer, a light stabilizer, an infrared absorbent, an antistatic agent, And the like.

The infrared absorbing agent is a compound that absorbs infrared rays having a wavelength of 800 nm or more. Examples of the compound include a nitroso compound, a metal complex salt thereof, a cyanine compound, a squarylium compound, a thiol nickel complex salt compound, a phthalocyanine compound, a naphthalocyanine compound, a triarylmethane compound, an iminium compound, a diimonium compound, Carbons, indium tin oxides, antimony tin oxides, oxides, carbides or borides of metals belonging to the 4A group, 5A group or 6A group of the periodic table can be used in the present invention. . These infrared absorbing agents are preferably selected so as to be able to absorb infrared rays (light having a wavelength in the range of about 800 to about 1100 nm), and two or more kinds of infrared absorbing agents may be used in combination. The compounding amount of the infrared absorber can be appropriately adjusted so that the light transmittance at the wavelength of 800 nm or more of the optical film is 10% or less.

(Other Explanation of Optical Film)

The acrylic resin composition constituting the optical film of the present invention preferably has a glass transition temperature Tg within a range of 80 to 120 캜. This composition is also characterized by having a high hardness of the surface when molded into a film, more specifically, JIS K 5600-5-4: 1999 " General Test Methods for Paint " - Part 5: Mechanical Properties of Coating Film - Hardness (pencil method) ", the pencil hardness measured at a load of 500 g is preferably H or harder than that.

Further, from the viewpoint of the flexibility of the optical film, the composition preferably has a flexural modulus of not more than 1500 MPa measured according to JIS K 7171: 2008 " Method for obtaining plastic-bending properties ". The flexural modulus is more preferably 1300 MPa or less, and further preferably 1200 MPa or less. This bending elastic modulus varies depending on the type and amount of the acrylic resin in the acrylic resin composition or the amount of the rubber elastomer particles. For example, as the content of the rubber elastomer particles increases, the flexural modulus generally decreases. Further, as compared with the case where a homopolymer of an alkyl methacrylate is used as the acrylic resin, a copolymer of an alkyl methacrylate and an alkyl acrylate or the like is generally used, but the bending elastic modulus generally decreases. On the other hand, in the case of using the acrylic elastomer particles of the above-mentioned two-layer structure, as compared with the case of using the acrylic elastomer particles of the above three-layer structure as the rubber elastomer particles, the bending elastic modulus generally becomes smaller, When used, the flexural modulus of elasticity is further reduced. Further, in the rubber elastomer particles, the smaller the average particle diameter of the elastic body or the larger the amount of the elastic body, the lower the bending elastic modulus generally becomes. Therefore, the type and amount of the acrylic resin or rubber elastomer particles may be adjusted within the above-mentioned predetermined range so that the bending elastic modulus becomes 1500 MPa or less.

As described above, the optical film of the present invention is formed by adding a predetermined amount of rubber elastomer particles to an acrylic resin and forming a resinous active material composition in which a small amount of a lubricant is further blended, and further preferably an ultraviolet absorber is further blended. Layer structure in which the layer formed of the active agent composition is a single layer. In the case where the optical film has a multilayer structure, there is no particular limitation on the composition of the layer that may be present in the layer other than the layer formed of the resinous active material composition. For example, the layer may be an acrylic resin containing no rubber elastomer particles or a composition thereof , Or a layer formed of a composition of rubber elastic particles and an acrylic resin having a content or an average particle diameter outside the range specified in the present invention. Layer structure composed of a resinous resin composition layer defined in the present invention / a layer of an acrylic resin containing no rubber elastomer particles or a layer of the composition, or a two- A three-layer structure composed of a layer of a resinous active agent composition / an acrylic resin containing no rubber elastic particles or a layer of the composition / a layer of the resinous active agent composition defined in the present invention. When an optical film having a multilayer structure is bonded to a polarizing film to form a polarizing plate, the layer formed of the resin activating composition specified in the present invention may be a bonding surface to the polarizing film.

When the optical film has a multilayer structure, the content of the rubber elastomer particles and the additive in each layer may be different from each other. For example, a structure in which a layer containing an ultraviolet absorber and / or an infrared absorber is interposed therebetween and a layer not containing an ultraviolet absorber and an infrared absorber are stacked may be employed. In addition, the content of the ultraviolet absorber in the layer made of the resinous resin composition defined in the present invention may be higher than the content of the ultraviolet absorber in the layer made of acrylic resin or rubber composition containing no rubber elastomer particles, , Ultraviolet rays can be efficiently blocked without deteriorating the color tone of the polarizing plate, and it is possible to prevent a decrease in the degree of polarization during long-term use.

The optical film of the present invention can be produced by forming a resin liner composition in which a predetermined amount of rubber elastomer particles are blended with the above-mentioned acrylic resin, a small amount of liner is further blended, or a resinous liner composition further blended with an ultraviolet absorber. When this optical film is used as a protective film of a polyvinyl alcohol polarizing film, its thickness can be arbitrarily selected within a range of usually about 5 to 200 mu m. The thickness thereof is preferably 10 占 퐉 or more, more preferably 150 占 퐉 or less, and more preferably 100 占 퐉 or less.

A method of melt-extruding the resin-activator composition described so far and sandwiched between two metal rolls is preferably used for the film formation. In this case, the metal roll is preferably a mirror-surface roll, and thus an optical film excellent in surface smoothness can be obtained. In the case of producing the optical film in a multilayer structure, the resin-bound active matrix resin composition as defined in the present invention may be formed by multilayer co-extrusion with other acrylic resin or composition thereof.

(A function that can be arbitrarily added to the optical film)

The optical film can be subjected to a hard coat treatment from the viewpoint of preventing scratches on the surface in the assembly process of the liquid crystal module. It is also possible to perform surface treatment such as antistatic treatment. However, when the polarizing plate is formed by using the optical film of the present invention as a protective film of a polarizing film, the antistatic function can be imparted by subjecting the optical film to surface treatment, Or may be imparted to other portions of the built-in polarizing plate. Examples of the surface treatment for the optical film include an antireflection treatment and an antifouling treatment. Further, the antiglare treatment may be carried out from the viewpoints of improvement in visibility, prevention of external light exposure, reduction in light and light caused by interference between the prism sheet and the color filter, and the like. With respect to the form in which the anti-glare treatment is carried out to make the film a diaphragm, the description will be made by changing the terms, and the other functional layers will be described here in order.

(Hard coat layer)

The hard coat layer has a function of increasing the surface hardness of the optical film and is formed for the purpose of preventing scratches on the surface or the like. The hard coat layer is subjected to a pencil hardness test specified in JIS K 5600-5-4: 1999 "General Test Methods for Paint- Part 5: Mechanical Properties of Coating Film- Section 4: Scratch Hardness (Pencil Method) Is measured by placing the formed optical film on a glass plate), it is preferable to show 2H or a harder value thereof. The material for forming such a hard coat layer is generally cured by heat or light. For example, organic hard coat materials such as organic silicon type, melamine type, epoxy type, acrylic type, and urethane acrylate type, and inorganic hard coat materials such as silicon dioxide can be used. Of these, urethane acrylate-based and polyfunctional acrylate-based hard coat materials are preferable from the viewpoint of good adhesion to the acrylic resin film of the substrate and excellent productivity.

The hard coat layer may contain various fillers for the purpose of adjusting the refractive index, improving the flexural elastic modulus, stabilizing the volume shrinkage ratio, and further improving the heat resistance, antistatic property, light resistance and the like. The hard coat layer may contain additives such as an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent, a leveling agent, and an antifoaming agent.

(Antistatic layer)

The antistatic layer is formed for the purpose of imparting conductivity to the surface of the film and suppressing the influence of static electricity. The antistatic layer may be formed, for example, by applying a resin composition containing a conductive material (antistatic agent). For example, an antistatic hard coat layer can be formed by allowing an antistatic agent to coexist in the hard coat material used for forming the above-mentioned hard coat layer.

(Antireflection layer)

The antireflection layer is a layer for preventing reflection of external light, and is formed directly on the surface (the surface exposed to the outside) of the optical film, or through another layer such as a hard coat layer. The optical film on which the antireflection layer is formed preferably has a reflectance of 2% or less at an incident angle of 5 DEG with respect to light having a wavelength of 430 to 700 nm. Particularly, the reflectance at a same incident angle with respect to light with a wavelength of 550 nm is 1% desirable.

The thickness of the antireflection layer may be about 0.01 to 1 mu m, more preferably 0.02 to 0.5 mu m. The antireflection layer is composed of a low refractive index layer having a refractive index smaller than the refractive index of the layer (optical film or hard coat layer or the like) on which it is formed, specifically, a refractive index of 1.30 to 1.45, A plurality of thin film high refractive index layers made of an inorganic compound alternately stacked, or the like.

The material for forming the low refractive index layer is not particularly limited as long as the refractive index is small.

For example, a resin material such as an ultraviolet ray-curable acrylic resin, a hybrid material in which inorganic fine particles such as colloidal silica are dispersed in a resin, and a sol-gel material containing an alkoxysilane. The low refractive index layer may be formed by applying the polymer after polymerization, or may be formed by applying the monomer in the form of a monomer or oligomer to be a precursor, and then polymerizing and curing it. Further, each of the materials preferably contains a compound having a fluorine atom in the molecule in order to impart antifouling property.

As the sol-gel material for forming the low refractive index layer, those having fluorine atoms in the molecule are preferably used. A typical example of a sol-gel material having fluorine atoms in the molecule is polyfluoroalkylalkoxysilane. The polyfluoroalkylalkoxysilane is, for example,

CF ₃ (CF ₂ ) _n CH ₂ CH ₂ Si (OR) ₃

, Wherein R represents an alkyl group having 1 to 5 carbon atoms, and n represents an integer of 0 to 12. Among them, a compound in which n is 2 to 6 in the above formula is preferable.

Specific examples of the polyfluoroalkylalkoxysilane include the following compounds.

3,3,3-trifluoropropyltrimethoxysilane,

3,3,3-trifluoropropyltriethoxysilane,

3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyltrimethoxysilane,

3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyltriethoxysilane,

3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl trimethoxysilane,

3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl triethoxysilane and the like.

The low refractive index layer may be composed of a cured product of a thermosetting fluorine-containing compound or an ionizing radiation-curable fluorine-containing compound. The cured product preferably has a dynamic friction coefficient in the range of 0.03 to 0.15, and preferably has a contact angle to water in the range of 90 to 120 degrees. Examples of the curable fluorine-containing compound include polyfluoroalkyl group-containing silane compounds (for example, 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltriethoxysilane, etc.), and fluorine-containing polymers having a crosslinkable functional group.

The fluorine-containing polymer having a crosslinkable functional group can be prepared by copolymerizing a fluorine-containing monomer with a monomer having a crosslinkable functional group or by copolymerizing a monomer having a functional group with a fluorine-containing monomer and then polymerizing the monomer having a crosslinkable functional group And then adding the compound.

Examples of the fluorine-containing monomer to be used herein include fluoroolefins such as fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, and perfluoro-2,2-dimethyl-1,3-dioxol And other partially or completely fluorinated alkyl ester derivatives of (meth) acrylic acid, and fully or partially fluorinated vinyl ethers.

Examples of the compound having a crosslinkable functional group or a compound having a crosslinkable functional group include monomers having a glycidyl group such as glycidyl acrylate and glycidyl methacrylate; Monomers having a carboxyl group such as acrylic acid or methacrylic acid; Monomers having a hydroxyl group such as hydroxyalkyl acrylate and hydroxyalkyl methacrylate; Monomers having an alkenyl group such as allyl acrylate or allyl methacrylate; Monomers having an amino group; And sulfonic acid group-containing monomers.

The material for forming the low refractive index layer may include a sol in which inorganic compound fine particles such as silica, alumina, titania, zirconia, magnesium fluoride, etc. are dispersed in an alcohol solvent from the viewpoint of enhancing resistance. From the viewpoint of antireflection property, the inorganic fine particles to be used for this purpose preferably have a smaller refractive index. These inorganic compound fine particles may have voids, and hollow fine particles of silica are particularly preferable. The average particle diameter of the hollow fine particles is preferably in the range of 5 to 2000 nm, more preferably 20 to 100 nm. The average particle diameter referred to herein is the number average particle diameter determined by transmission electron microscope observation.

(Stratum corneum)

The antifouling layer is formed to impart water repellency, oil repellency, cold resistance, antifouling property and the like. A preferred material for forming the antifouling layer is a fluorine-containing organic compound. Examples of the fluorine-containing organic compound include fluorocarbon, perfluorosilane, and polymer compounds thereof. The method of forming the antifouling layer may be physical vapor deposition, chemical vapor deposition, wet coating or the like, in which vapor deposition and sputtering are typical examples, depending on the material to be formed. The average thickness of the antifouling layer is usually about 1 to 50 nm, preferably 3 to 35 nm.

(Repellent film)

The optical film of the present invention, in which a predetermined amount of rubber elastomer particles are blended with an acrylic resin and a resin activator composition in which a small amount of a lubricant is further blended, or a resinous active composition in which an ultraviolet absorber is further blended is formed, So that it can be made into a flammable film. That is, the antireflection film is composed of an optical film and an antiglare layer having a fine surface relief shape formed on the surface thereof. The antiglare layer is a layer having a fine concavo-convex shape on its surface, and is preferably formed of the aforementioned hard coat material.

The antiglare layer having fine irregularities on its surface may be formed by forming a coating film containing organic fine particles or inorganic fine particles on the surface of the optical film to form irregularities based on the fine particles or a method of forming a coating film containing organic fine particles or inorganic fine particles Or a method in which a concavo-convex shape is transferred onto a roll having a concave-convex shape on the surface thereof (also referred to as an embossing method), or the like. Examples of the method for forming the coating film include a method of applying a coating liquid comprising a composition in which organic or inorganic fine particles are blended with a curable transparent resin on the surface of an optical film.

(Fine particles)

When fine particles are blended to form the antiglare layer, the fine particles preferably have an average particle diameter of 0.5 to 5 mu m and a difference in refractive index from the transparent resin of 0.02 to 0.2. By using fine particles having an average particle diameter and a difference in refractive index from the transparent resin in this range, it is possible to effectively develop haze. The average particle diameter of the fine particles can be obtained by a dynamic light scattering method or the like. In the present specification, the average particle diameter of the fine particles was directly used as the value obtained from the manufacturer. The average particle diameter is the weight average particle diameter.

As the inorganic fine particles for forming the antiglare layer, silica, colloidal silica, alumina, alumina sol, aluminosilicate, alumina-silica composite oxide, kaolin, talc, mica, calcium carbonate, calcium phosphate and the like can be used. As the organic fine particles, resin particles are generally used, and examples thereof include crosslinked polyacrylic acid particles, methyl methacrylate / styrene copolymer resin particles, crosslinked polystyrene particles, crosslinked polymethyl methacrylate particles, silicone resin particles, And the like.

(A transparent resin used for forming the antiglare layer)

The transparent resin for dispersing the inorganic fine particles or the organic fine particles is preferably selected from a material having a high hardness (hard coat). As such a transparent resin, a photo-curable resin, a thermosetting resin, an electron beam-curable resin, or the like can be used, but a photo-curable resin is preferably used from the viewpoints of productivity and hardness of the resulting film. As the photo-curing resin, a polyfunctional acrylate is generally used. Examples thereof include di- or tri-acrylate of trimethylolpropane, tri- or tetra-acrylate of pentaerythritol, polyfunctional urethane acrylate which is the reaction product of an acrylate having at least one hydroxyl group in the molecule with a diisocyanate . These polyfunctional acrylates may be used alone or in combination of two or more as necessary.

Also, a mixture of a multifunctional urethane acrylate, a polyol (meth) acrylate, and a (meth) acrylic polymer having an alkyl group containing two or more hydroxyl groups may be used as a photo-curable resin. The multifunctional urethane acrylate constituting the photo-curable resin is prepared by using, for example, (meth) acrylic acid and / or (meth) acrylic acid ester, polyol and diisocyanate. Specifically, a hydroxy (meth) acrylate having at least one hydroxyl group in a molecule is prepared from (meth) acrylic acid and / or a (meth) acrylic acid ester and a polyol and reacted with a diisocyanate to obtain a polyfunctional urethane acryl Rate can be produced. The multifunctional urethane acrylate produced in this manner is also the photocurable resin itself which has been previously disclosed. In the production thereof, the (meth) acrylic acid and / or the (meth) acrylic acid ester may be used either singly or in combination of two or more, and the polyol and the diisocyanate may be used in the same manner Or two or more of them may be used in combination.

The (meth) acrylic acid ester which is one raw material of the polyfunctional urethane acrylate may be a chain or cyclic alkyl ester of (meth) acrylic acid. Specific examples thereof include alkyl (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl And cycloalkyl (meth) acrylates such as cyclohexyl (meth) acrylate.

The polyol which is another raw material of the polyfunctional urethane acrylate is a compound having at least two hydroxyl groups in the molecule. Examples thereof include aliphatic diols such as ethylene glycol, propylene glycol, 1,3-propanediol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, Nonanediol, 1,10-decanediol, 2,2,4-trimethyl-1,3-pentanediol, 3-methyl-1,5-pentanediol, neopentyl glycol esters of hydroxypivalic acid, cyclohexanedimethylol , Hydrogenated bisphenol A, ethylene oxide adduct bisphenol A, propylene oxide adduct bisphenol A, trimethylol ethane, trimethylol propane, glycerin, 3-methylpentane-1,6-hexanediol, 1,4-cyclohexanediol, spiroglycol, tricyclodecane dimethylol, hydrogenated bisphenol A, 1,3,5-triol, pentaerythritol, dipentaerythritol, tripentaerythritol, glucose and the like.

The diisocyanate which is another raw material of the polyfunctional urethane acrylate is a compound having two isocyanato groups (-NCO) in the molecule and various aromatic, aliphatic or alicyclic diisocyanates can be used. Specific examples include tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2,4-tolylene diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, 3,3 ' -Dimethyl-4,4'-diphenyl diisocyanate, xylylene diisocyanate, trimethylhexamethylene diisocyanate, 4,4'-diphenylmethane diisocyanate, and a nuclear hydrogen addition product of a diisocyanate having an aromatic ring therebetween. .

The polyol (meth) acrylate constituting the photocurable resin together with the polyfunctional urethane acrylate is a (meth) acrylate of a compound having at least two hydroxyl groups in the molecule (that is, a polyol). Specific examples thereof include pentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (Meth) acrylate, and the like. These polyol (meth) acrylates may be used alone or in combination. The polyol (meth) acrylate preferably includes pentaerythritol triacrylate and / or pentaerythritol tetraacrylate.

The (meth) acrylic polymer having an alkyl group having two or more hydroxyl groups constituting the photocurable resin together with these polyfunctional urethane acrylates and polyol (meth) acrylates is a polymer having two hydroxyl groups in one constituent unit Or more. For example, a polymer containing 2,3-dihydroxypropyl (meth) acrylate as a constitutional unit or a polymer containing 2,3-dihydroxypropyl (meth) acrylate and 2-hydroxyethyl (meth) As a constituent unit, and the like.

By using the acrylic photocurable resin as described above, the adhesion to the optical film is improved, the mechanical strength is improved, and a retardation film capable of effectively preventing scratches on the surface can be obtained.

(Photopolymerization initiator)

Such a photocurable resin becomes a photocurable resin composition in combination with a photopolymerization initiator. Examples of the photopolymerization initiator include various ones such as acetophenone, benzophenone, benzoin ether, amine, and phosphine oxide. Examples of the compound classified as an acetophenone-based photopolymerization initiator include 2,2-dimethoxy-2-phenylacetophenone (aka benzyldimethyl ketal), 2,2-diethoxyacetophenone, 1- (4- ), 2-methyl-2-morpholino-1- (4-methylthiophenyl) propan-1-one and the like . Examples of the compound classified as a benzophenone-based photopolymerization initiator include benzophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, and the like. Examples of compounds classified as benzoin ether photopolymerization initiators include benzoin methyl ether, benzoin propyl ether, and the like. Examples of the compound classified as an amine-based photopolymerization initiator include N, N, N ', N'-tetramethyl-4,4'-diaminobenzophenone (alias Michler's ketone). Examples of the phosphine oxide photopolymerization initiator include 2,4,6-trimethylbenzoyldiphenylphosphine oxide and the like. In addition, xanton-based compounds and thioxanthone-based compounds are also known as photopolymerization initiators.

These photopolymerization initiators are commercially available. Examples of typical commercial products include "ILVACURE 907" and "ILVACURE 184" sold by Chiba of Switzerland, and "Lucillin TPO" sold by BASF of Germany.

(Other components incorporated in the photocurable resin composition)

To the photo-curing resin composition, a solvent is added if necessary. In this case, for example, any organic solvent capable of dissolving each component constituting the composition such as ethyl acetate or butyl acetate can be used. Of course, two or more kinds of organic solvents may be mixed and used.

The photo-curing resin composition may contain a leveling agent, for example, a fluorine-based or silicone-based leveling agent. Silicone leveling agents include reactive silicones, polydimethylsiloxanes, polyether-modified polydimethylsiloxanes, and polymethylalkylsiloxanes. Among silicone leveling agents, preferred are leveling agents based on reactive silicones and siloxanes. When a leveling agent composed of reactive silicon is used, slip property is imparted to the surface of the hard coat layer, and excellent scratch resistance can be sustained for a long period of time. When a leveling agent based on siloxane is used, film formability can be improved.

(Formation of an antiglare layer)

When the photocurable resin is used for forming the antiglare layer, inorganic or organic fine particles are dispersed in each component constituting the photo-curable resin composition described above, the resin composition is coated on the optical film, A hard coat layer (antiglare layer) in which fine particles are dispersed in a transparent resin can be formed.

On the other hand, in the case of forming the antiglare layer having the fine surface relief shape by the embossing method, the shape of the mold may be transferred to the resin layer formed on the optical film by using the mold having the fine unevenness. In the case of forming the fine surface relief shape by the embossing method, the resin layer to which the relief shape is transferred may or may not contain inorganic or organic fine particles. The transfer of the convexo-concave shape by the embossing method is preferably carried out by a UV embossing method using an ultraviolet curing resin.

In the UV embossing method, an ultraviolet curable resin layer is formed on the surface of an optical film, and the ultraviolet curable resin layer is cured while pressing the uneven surface of the mold to transfer the uneven surface of the mold to the ultraviolet curable resin layer. Specifically, an ultraviolet ray-curable resin is coated on an optical film, the ultraviolet ray-curable resin is cured by irradiating ultraviolet rays from the optical film side in a state in which the coated ultraviolet ray-curable resin is in contact with the uneven surface of the mold, The optical film having the ultraviolet-curing resin layer formed thereon is peeled from the mold, and the shape of the mold is transferred to the ultraviolet-curable resin. The kind of ultraviolet ray-curable resin is not particularly limited and various kinds of the above-mentioned ultraviolet ray-curable resins can be used. In place of the ultraviolet ray hardening resin, a visible light hardening resin that can be cured to visible light having a longer wavelength than ultraviolet ray may be used by appropriately selecting a photopolymerization initiator.

The thickness of the antiglare layer is not particularly limited, but is generally 2 mu m or more and 30 mu m or less, preferably 3 mu m or more, and more preferably 20 mu m or less. If the thickness of the antiglare layer is less than 2 占 퐉, sufficient hardness can not be obtained and the surface tends to be damaged. When the thickness of the antiglare layer is thicker than 30 占 퐉, cracks tend to occur, And there is a tendency that the productivity is lowered due to drying.

As described above, haze is imparted to the antireflection film by the antiglare layer. The haze value of the repellent film is preferably in the range of 5 to 50%. When the haze value is less than 5%, sufficient antiglare performance can not be obtained and external light is likely to be seen on the screen. On the other hand, in the region where the haze value exceeds 50%, the shining of the external light can be reduced, but the sharpness of the screen of black display is lowered. The haze value is a ratio of the diffusion transmittance to the total light transmittance, and is measured in accordance with JIS K 7136: 2000 " Method for determining haze of plastic-transparent material ".

(Polarizer and Polarizer Polarizer)

The optical film formed of the above-described resinous active composition or the light-shielding film having the antiglare layer formed on the surface thereof may be bonded to a polarizing film as a protective film to form a polarizing plate. When the anti-glare film is bonded to the polarizing film, it is bonded to the polarizing film on the side opposite to the anti-glare film. The optical film or the light-diffusing film of the present invention may be bonded to one side of the polarizing film, and a protective film made of another resin may be bonded to the other side of the polarizing film. Hereinafter, when it is simply referred to as an " optical film "

(Polarizing film)

The polarizing film may be one in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol-based resin film so as to obtain predetermined polarization characteristics. As the dichroic dye, iodine or a dichroic organic dye is used. Such a polarizing film includes an iodine-based polarizing film in which iodine is adsorbed and oriented on a polyvinyl alcohol-based resin film and a dye-based polarizing film in which a dichroic organic dye is adsorbed and oriented on a polyvinyl alcohol-based resin film.

The polyvinyl alcohol resin constituting the polarizing film can be obtained by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, unsaturated sulfonic acids, olefins, vinyl ethers and the like. In addition, the polyvinyl alcohol resin may be modified, and for example, polyvinyl formal modified with aldehydes, polyvinyl acetal, polyvinyl butyral and the like may be used.

The polarizing plate usually comprises a moisture conditioning step of adjusting the moisture content of the polyvinyl alcohol resin film, a step of uniaxially stretching the polyvinyl alcohol resin film, a step of dying the polyvinyl alcohol resin film with a dichroic dye to adsorb the dichroic dye A step of treating a polyvinyl alcohol resin film in which a dichroic dye is adsorbed and oriented with an aqueous solution of boric acid, a cleaning step of washing off free boric acid or the like attached to the surface after boric acid treatment, and these steps A step of bonding a protective film to a uniaxially stretched polyvinyl alcohol resin film in which a dichroic dye is adsorbed and oriented.

Uniaxial stretching may be performed before dyeing, during dyeing, or during boric acid treatment after dyeing. Or may be uniaxially stretched in a plurality of such steps. The uniaxial stretching may be performed between rolls different in circumferential speed, or may be performed using a heat roll. In addition, dry stretching may be performed in the atmosphere, or wet stretching may be performed in a state of being swollen with a solvent. The stretching magnification is usually about 4 to 8 times. The thickness of the polyvinyl alcohol polarizing film subjected to stretching and dyeing can be, for example, about 1 to 50 mu m, preferably about 10 to 35 mu m.

(Bonding of polarizing film and optical film)

Next, a method of bonding the polarizing film and the optical film will be described. An adhesive is generally used for bonding the polarizing film and the optical film. As the adhesive, an adhesive containing an epoxy resin, a urethane resin, a cyanoacrylate resin, an acrylamide resin, or the like may be used. One of the adhesives that is preferably used is an adhesive of a solventless formulation. The adhesive for the solventless form includes a curing compound (monomer or oligomer) that does not contain a significant amount of solvent but reacts and cures by irradiation with heating or an active energy ray (for example, ultraviolet rays, visible light, electron beam, X- , An adhesive layer is formed by curing the curable compound, and typically comprises a curable compound which undergoes reaction curing by heating or irradiation of an active energy ray, and a polymerization initiator. Among the non-solvent-type adhesives, it is preferable to cure by cationic polymerization from the viewpoint of reactivity. Particularly, the epoxy-based adhesive of the solventless type having an epoxy compound as a curable compound is composed of a polarizing film and an acrylic resin or other resin film It is preferably used since it has excellent adhesion with an optical film.

The epoxy compound which is the curing compound contained in the epoxy adhesive of the solventless formulation is preferably cured by cationic polymerization and it is more preferable to use an epoxy compound which does not contain an aromatic ring in the molecule in view of weatherability and refractive index desirable. Examples of the epoxy compound which does not contain an aromatic ring in the molecule include a hydride of an aromatic epoxy compound, an alicyclic epoxy compound, and an aliphatic epoxy compound. The epoxy compound, which is a curable compound, usually has two or more epoxy groups in the molecule.

First, the hydride of the aromatic epoxy compound will be described. The hydride of the aromatic epoxy compound is obtained by subjecting a nuclear hydrogenated polyhydroxy compound obtained by subjecting an aromatic polyhydroxy compound as a raw material of an aromatic epoxy compound to a hydrogenation reaction selectively with respect to an aromatic ring in the presence of a catalyst and under pressure, ≪ / RTI > Examples of the aromatic epoxy compound include bisphenol-type epoxy compounds such as diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F and diglycidyl ether of bisphenol S; Novolak type epoxy resins such as phenol novolak epoxy resin, cresol novolac epoxy resin and hydroxybenzaldehyde phenol novolac epoxy resin; Polyfunctional epoxy resins such as glycidyl ether of tetrahydroxyphenylmethane, glycidyl ether of tetrahydroxybenzophenone, and epoxylated polyvinylphenol. When an aromatic polyhydroxy compound represented by a bisphenol as a raw material of these materials is subjected to nuclear hydrogen addition as described above and then the epichlorohydrin is reacted with the hydroxyl group, a hydride of the aromatic epoxy compound is obtained. Among them, glycidyl ether of hydrogenated bisphenol A is preferable as a hydride of an aromatic epoxy compound.

Next, the alicyclic epoxy compound will be described. The term " alicyclic epoxy compound " means an epoxy compound having at least one epoxy group bonded to an alicyclic ring in the molecule and " having at least one epoxy group bonded to the alicyclic ring " . In the formula, m is an integer of 2 to 5.

Therefore, the alicyclic epoxy compound is a compound having at least one structure represented by the above formula in the molecule and including at least two epoxy groups in total in the molecule. More specifically, the compound in which one or more hydrogen atoms of the (CH ₂ ) _m in the above formula are removed from other groups bonded to other chemical structures may be an alicyclic epoxy compound. (CH ₂ ) _m may be appropriately substituted with a linear alkyl group such as methyl group or ethyl group. Among these alicyclic epoxy compounds, an epoxy compound having an epoxycyclopentane ring (wherein m = 3 in the above formula) or an epoxycyclohexane ring (in which m = 4 in the above formula) has an excellent adhesive strength can be obtained Therefore, it is more preferably used. Hereinafter, the structure of the preferable alicyclic epoxy compound is specifically exemplified.

3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, 3,4-

3,4-epoxy-6-methylcyclohexylmethyl 3,4-epoxy-6-methylcyclohexanecarboxylate,

Ethylene bis (3,4-epoxycyclohexanecarboxylate),

Bis (3,4-epoxycyclohexylmethyl) adipate,

Bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate,

Diethylene glycol bis (3,4-epoxycyclohexylmethyl ether),

Ethylene glycol bis (3,4-epoxycyclohexylmethyl ether),

2,3,14,15-Diepoxy-7,11,18,21-tetraoxatrispyro- [5.2.2.5.2.2] heneic acid (the compound is 3,4-epoxycyclohexane spiro- , 6'-dioxane spiro-3 ", 5" -dioxan spiro-3 "', 4"' - epoxycyclohexane)

Epoxy-1,3-epoxycyclohexyl) -8,9-epoxy-1,5-dioxaspiro [5.5] undecane,

4-vinylcyclohexene dioxide,

Bis-2,3-epoxycyclopentyl ether,

Dicyclopentadiene dioxide and the like.

Further, the aliphatic epoxy compound may be a polyglycidyl ether of an aliphatic polyhydric alcohol or an alkylene oxide adduct thereof. More specifically, diglycidyl ether of 1,4-butanediol, diglycidyl ether of 1,6-hexanediol, triglycidyl ether of glycerin, triglycidyl ether of trimethylol propane, di (Ethylene oxide or propylene oxide) obtained by adding at least one alkylene oxide (ethylene oxide or propylene oxide) to an aliphatic polyhydric alcohol such as glycidyl ether, diglycidyl ether of propylene glycol, ethylene glycol, propylene glycol or glycerin, Of polyglycidyl ether, and the like.

The above-described epoxy compounds may be used alone, or two or more epoxy compounds may be used in combination.

The epoxy equivalent of the epoxy compound contained in the epoxy-based adhesive of the non-solvent type is usually 30 to 3000 g / equivalent, preferably 50 to 1500 g / equivalent. If the epoxy equivalent is less than 30 g / equivalent, the flexibility of the optical film after curing the adhesive layer may be lowered or the adhesive strength may be lowered. On the other hand, if the epoxy equivalent exceeds 3,000 g / equivalent, compatibility with other components contained in the epoxy adhesive may deteriorate.

The epoxy-based adhesive of the solventless formulation usually contains a cationic polymerization initiator in order to cationically polymerize the epoxy compound. The cationic polymerization initiator is initiated by irradiation of active energy rays such as visible light, ultraviolet light, X-rays, and electron beams, or by heating to generate a cationic species or Lewis acid to initiate the polymerization reaction of the epoxy group. Any of these types of cationic polymerization initiators may be used, but it is preferable from the viewpoint of workability that the potential is imparted. Hereinafter, a cationic polymerization initiator for generating a cationic species or a Lewis acid by irradiation of an active energy ray such as visible light, ultraviolet ray, X-ray or electron beam to initiate the polymerization reaction of the epoxy group is also referred to as a photocationic polymerization initiator.

The use of a photocationic polymerization initiator enables the curing of the adhesive component at room temperature, so that it is possible to reduce the need to consider deformation due to heat resistance or expansion of the polarizing film, and thus the optical film can be formed on the polarizing film with good adhesion. Further, when a photocationic polymerization initiator is used, it acts catalytically by light, so that even when mixed with an epoxy adhesive, the storage stability and workability are excellent.

Examples of the cationic polymerization initiator include aromatic diazonium salts; Onium salts such as aromatic iodonium salts and aromatic sulfonium salts; Iron-allene complexes and the like can be used. These photo cationic polymerization initiators may be used alone or in combination of two or more. Among them, aromatic sulfonium salts are preferably used because they have ultraviolet ray absorption properties even in the wavelength region of 300 nm or more, and thus are excellent in curability and can provide cured products having good mechanical strength and adhesive strength.

These cationic polymerization initiators can be easily obtained as commercial products, and examples thereof include "Kayarad PCI-220" and "Kayarad PCI-620" sold by Nippon Kayaku Co., Ltd., Union Carbide "Adeka Optoma SP-150" and "Adeka Optoma SP-170" sold by Nippon Soda Co., Ltd. sold by "ADEKA", "CI-5102" DPI-101 "and" DPI-101 ", which are sold by Midori Kagaku Co., Ltd.," CIT-1370 "," CIT-1682 "," CIP-1866S "," CIP- 103, DPI-103, DPI-103, MPI-105, BBI-101, BBI-102, BBI- 103 "," MDS-103 "," MDS-105 "," DTS-102 "and" DTS-103 "," TPS-101 "," TPS-102 " PI-2074 "sold by Rodi < / RTI >

The blending amount of the photocationic polymerization initiator is usually 0.5 to 20 parts by weight, preferably 1 part by weight or more, and more preferably 15 parts by weight or less, based on 100 parts by weight of the epoxy compound.

The epoxy-based adhesive of the solventless formulation may contain a photosensitizer in addition to the photocationic polymerization initiator, if necessary. The use of a photosensitizer improves the reactivity and improves the mechanical strength and adhesive strength of the cured product. Examples of the photosensitizer include a carbonyl compound, an organic sulfur compound, a persulfate, a redox compound, an azo and diazo compound, a halogen compound, a light reducing pigment and the like. When the photosensitizer is blended, the amount thereof is about 0.1 to 20 parts by weight based on 100 parts by weight of the epoxy compound.

Examples of the thermal cationic polymerization initiator that generates a cationic species or a Lewis acid by heating to initiate the polymerization reaction of the epoxy group include a benzylsulfonium salt, a thiophenium salt, a thioronium salt, a benzylammonium salt, a pyridinium salt, Zirconium salts, carboxylic acid esters, sulfonic acid esters, amine imides, and the like. These thermal cationic polymerization initiating systems can be easily obtained as commercial products. For example, "ADEKA OPTON CP77" and "ADEKA OPTON CP66" sold by ADEKA Co., Ltd. and Nippon Soda Co., SANEIDO SI-60L "," SANEIDO SI-80L "and" SANEIDO SI-100L "sold by" SANYO KAGAKU KOGYO Co., And the like. These thermal cationic polymerization initiators may be used alone or in combination of two or more. In addition, a cationic polymerization initiator and a thermal cationic polymerization initiator may be used in combination.

The epoxy-based adhesive of the solventless formulation may further contain a compound that promotes cationic polymerization such as oxetanes and polyols.

In the case of using an epoxy-based adhesive of a solvent-free formulation, the polarizing film and the optical film can be adhered by applying the adhesive to the adhesive surface of the optical film and / or the polarizing film and bonding them together. There is no particular limitation on the method of applying the epoxy-based adhesive of the solventless type to the polarizing film and / or the optical film, and various coating methods such as a doctor blade, a wire bar, a die coater, a comma coater and a gravure coater can be used. Further, since each coating method has an optimal viscosity range, viscosity adjustment may be performed using a small amount of solvent. The solvent used for this purpose is not particularly limited as long as it can dissolve the epoxy adhesive well without deteriorating the optical performance of the polarizing film. For example, organic solvents such as hydrocarbons typified by toluene and esters typified by ethyl acetate can be used have.

After the optical film is bonded to the polarizing film via the adhesive layer made of the uncured epoxy adhesive, the adhesive layer is cured by irradiating or heating the active energy ray to fix the optical film on the polarizing film. When curing is carried out by irradiation of active energy rays, ultraviolet rays are preferably used. Specific ultraviolet light sources include low pressure mercury lamps, medium pressure mercury lamps, high pressure mercury lamps, black light lamps, and metal halide lamps. The irradiation intensity or irradiation amount of the active energy ray, for example, ultraviolet ray is suitably selected so as to sufficiently activate the cationic polymerization initiator and not adversely affect the cured adhesive layer, the polarizing film and the optical film. Further, in the case of curing by heating, it can be heated by a generally known method, and the temperature and time at that time can be controlled so that the cationic polymerization initiator can be sufficiently activated and adverse effects on the cured adhesive layer, polarizing film and optical film And is appropriately selected.

The thickness of the adhesive layer made of the epoxy-based adhesive after curing as described above can be usually in the range of about 0.1 to 50 mu m, preferably 1 mu m or more. Further, it is more preferable that the thickness is in the range of 1 to 20 占 퐉, and moreover, in the range of 2 to 10 占 퐉.

The epoxy-based adhesive of the above-described solventless form can be suitably used for joining an optical film made of an acrylic resin with a polarizing film or joining an optical film made of a resin film other than an acrylic resin and a polarizing film, .

Another preferable adhesive that can be used for bonding the optical film and the polarizing film is an aqueous adhesive, that is, an adhesive component dissolved in water, or a dispersion of the adhesive in water. By using an aqueous adhesive, the thickness of the adhesive layer can be made smaller. Examples of the water-based adhesive include water-soluble crosslinkable epoxy resin or hydrophilic urethane-based resin as an adhesive component.

Examples of the water-soluble crosslinkable epoxy resin include polyamido polyamines obtained by the reaction of polyalkylene polyamines such as diethylenetriamine and triethylenetetramine with dicarboxylic acids such as adipic acid, epichlorohydrin And a polyamide epoxy resin obtained by the reaction. Commercially available products of such polyamide epoxy resins include "Sumirez Resin 650" and "Sumirez Resin 675" sold by Sumika Chemtex Co., Ltd. under the trade names.

When a water-soluble crosslinkable epoxy resin is used as an adhesive component, it is preferable to mix other water-soluble resins such as a polyvinyl alcohol resin in order to further improve the coatability and the adhesiveness. The polyvinyl alcohol resin may contain, in addition to partially saponified polyvinyl alcohol or fully saponified polyvinyl alcohol, a modified polyvinyl alcohol such as a carboxyl group-modified polyvinyl alcohol, acetoacetyl group-modified polyvinyl alcohol, methylol group-modified polyvinyl alcohol and amino group- Or a polyvinyl alcohol-based resin. Above all, a saponification product of a copolymer of vinyl acetate and an unsaturated carboxylic acid or its salt, that is, a carboxyl group-modified polyvinyl alcohol is preferably used. The term "carboxyl group" as used herein is a concept including -COOH and a salt thereof.

Examples of preferable commercially available carboxyl group-modified polyvinyl alcohols include "Kurarupofaru KL-506", "Kurarupofaru KL-318" and "Kurarupofaru KL "DR-0415" sold by Tenkika Kakogyo Co., Ltd., "Kosei T-330" and "Kosei T-350" sold by Nippon Gohsei Kaikakogyo Co., AF-17 "," AT-17 ", and" AP-17 "sold by Sakubi-Poval Co.,

The adhesive containing a water-soluble crosslinkable epoxy resin can be prepared as an adhesive aqueous solution by dissolving the above-mentioned epoxy resin and other water-soluble resin such as a polyvinyl alcohol resin added as needed in water. In this case, the water-soluble crosslinkable epoxy resin preferably has a concentration in the range of about 0.2 to 2 parts by weight based on 100 parts by weight of water. When the polyvinyl alcohol resin is blended, the amount thereof is preferably about 1 to about 10 parts by weight, more preferably about 1 to about 5 parts by weight, based on 100 parts by weight of water.

On the other hand, when an aqueous adhesive containing a urethane-based resin is used, examples of suitable urethane resins include ionomer-type urethane resins, particularly polyester-based ionomer-type urethane resins. Here, the ionomer type means that a small amount of an ionic component (i.e., a hydrophilic component) is introduced into the urethane resin constituting the skeleton. The polyester-based ionomer-type urethane resin is a urethane resin having a polyester skeleton in which a small amount of an ionic component (hydrophilic component) is introduced. Such an ionomeric urethane resin is preferable as an aqueous adhesive since it emulsifies directly by emulsification in water without using an emulsifier. Examples of commercially available products of polyester-based ionomer type urethane resins include "Hidoran AP-20" and "Hidoran APX-101H" sold by DIC Co. under the trade names, all in the form of emulsion can do.

When an ionomer type urethane resin is used as an adhesive component, it is preferable to further blend a crosslinking agent such as an isocyanate type. The isocyanate crosslinking agent is a compound having at least two isocyanate groups (-NCO) in the molecule, and examples thereof include 2,4-tolylene diisocyanate, phenylenediisocyanate, 4,4'-diphenylmethane diisocyanate, Hexamethylene diisocyanate and isophorone diisocyanate, an adduct in which a plurality of these molecules are added to polyhydric alcohols such as trimethylolpropane, three diisocyanate molecules each having a part of the isocyanate group at one end thereof Isocyanurate compound in which an isocyanurate ring is formed, and a polyisocyanate-modified product such as a burette compound in which three molecules of diisocyanate are formed by hydration and decarboxylation at the respective one ends of isocyanate groups . Commercially available isocyanate-based crosslinking agents that can be preferably used include those sold under the trade name "High Doran Aster C-1" by DIC Corporation.

In the case of using an aqueous adhesive containing an ionomer type urethane resin, from the viewpoint of viscosity and adhesiveness, the concentration of the urethane resin is preferably 10 to 70% by weight, more preferably 20 to 50% by weight, It is preferably dissolved or dispersed in water. When an isocyanate crosslinking agent is compounded, the amount thereof is appropriately selected so that the amount of the isocyanate crosslinking agent is about 5 to 100 parts by weight based on 100 parts by weight of the urethane resin.

When such an aqueous adhesive is used, the polarizing film and the optical film can be bonded to each other by applying the adhesive to the adhesive surface of the optical film and / or the polarizing film and bonding them together. More specifically, after an aqueous adhesive is uniformly applied to the polarizing film and / or the optical film by a coating method such as a doctor blade, a wire bar, a die coater, a comma coater, a gravure coater or the like, A method in which the films are overlapped and joined together by a roll or the like, and then dried. The drying can be performed at a temperature of, for example, about 60 to 100 占 폚. It is preferable to cure for about 1 to 10 days at a temperature slightly higher than room temperature, for example, about 30 to 50 占 폚, after drying.

These water-based adhesives can be used in the same manner as the epoxy-based adhesive of the above-described non-solvent type, by bonding of an optical film made of an acrylic resin and a polarizing film or bonding of an optical film made of a resin other than an acrylic resin and a polarizing film, Can be preferably used. When an optical film made of an acrylic resin is laminated on both surfaces of a polarizing film and an optical film made of an acrylic resin is laminated on one surface of a polarizing film and an optical film made of a resin other than an acrylic resin A retardation film such as a viewing angle compensating film, the same applies hereinafter), the same or different adhesives may be used for the adhesion of the films laminated on both sides of the polarizing film, In order to simplify the process and reduce the constituent members of the polarizing plate, it is preferable to use the same adhesive.

In producing a polarizing plate, it is preferable that the surface of the optical film made of an acrylic resin and the side bonded to the polarizing film in an optical film made of a resin other than an acrylic resin are subjected to a corona discharge treatment. By carrying out the corona discharge treatment, the adhesion between these films and the polarizing film can be increased. The corona discharge treatment is a treatment for activating a resin film disposed between electrodes by discharging a high voltage between electrodes. The effect of the corona discharge treatment varies depending on the type of the electrode, the electrode interval, the voltage, the humidity, the kind of the resin film to be used, and the like. For example, the electrode interval is 1 to 5 mm and the moving speed is about 3 to 20 m / . After the corona discharge treatment, the polarizing film is bonded to the treated surface through the adhesive.

Example

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. In the examples,% and parts representing the content or amount are based on weight unless otherwise specified.

Example 1

(Acrylic resin and acrylic elastomer particles)

A copolymer of methyl methacrylate / methyl acrylate in a weight ratio of 96/4 was used as an acrylic resin. The innermost layer is composed of a rigid polymer obtained by polymerizing methyl methacrylate with a small amount of allyl methacrylate and an intermediate layer composed of a copolymer of butyl acrylate as a main component and styrene and a small amount of allyl methacrylate Layered structure composed of a hard polymer obtained by polymerizing a soft elastic body and an outermost layer by using a small amount of ethyl acrylate in methyl methacrylate and having an average particle diameter of 240 nm to an elastic body as an intermediate layer, Polymer particles.

(Production of acrylic optical film)

The pellets in which the acrylic resin and the acrylic elastomer particles were blended in a weight ratio of former / latter = 70/30 were melt-kneaded by a twin-screw extruder while 0.05 part of stearic acid as a lubricant was added to 100 parts of the pellets, Of pellets. The pellets were poured into a single-screw extruder of 65 mmφ, extruded through a T-die having a set temperature of 275 ° C, and both surfaces of the extruded film-like molten resin were sandwiched between two polishing rolls And cooled to prepare an acrylic resin film. The obtained film was wound on a core of 6 inches in diameter (15.2 mm).

As a result of storing the film for 3 months in a state wound on the core, no tightening was observed even after storage for 3 months, and no bleeding out of the lubricant was observed.

Example 2

An acrylic resin film was prepared in the same manner as in Example 1 except that the amount of stearic acid added was changed from 0.05 part to 0.03 part, and wound on a core having a diameter of 6 inches. As a result of storing the film for 3 months in a state wound on the core, no tightening was observed even after storage for 3 months, and no bleeding out of the lubricant was observed.

Example 3

An acrylic resin film was produced in the same manner as in Example 1 except that the amount of stearic acid was changed from 0.05 part to 0.07 part, and wound on a core having a diameter of 6 inches. As a result of storing the film for 3 months in a state wound on the core, no tightening was observed even after storage for 3 months, and no bleeding out of the lubricant was observed.

Example 4

In Example 1, a benzotriazole-based ultraviolet absorber, 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazole- 2-yl) phenol] was added in an amount of 0.5 part based on the total 100 parts by weight of the acrylic resin and the acrylic elastomer particles, and otherwise, the pellets of the resinous active composition were prepared in the same manner as in Example 1, An acrylic resin film was produced by the same melt extrusion method as in Example 1 and wound on a core of 6 inches in diameter. This film exhibited a transmittance of 23% at a wavelength of 380 nm. As a result of storing the film for 3 months in a state wound on the core, no tightening was observed even after storage for 3 months, and no bleeding out of the lubricant was observed.

Example 5

An acrylic resin film was produced in the same manner as in Example 4 except that the blending amount of the benzotriazole ultraviolet absorber to the total amount of 100 parts by weight of the acrylic resin and the acrylic elastomer particles was changed to 1.9 parts, Inch wound on the core.

This film exhibited a transmittance of 0.9% at a wavelength of 380 nm. As a result of storing the film for 3 months in a state wound on the core, no tightening was observed even after storage for 3 months, and no bleeding out of the lubricant was observed.

Comparative Example 1

An acrylic resin film was produced in the same manner as in Example 1 except that stearic acid was not added, and wound on a core of 6 inches in diameter. As a result of storing the film for 3 months in the state of being wound on the core, the film was tightened after being stored for 3 months. Here, the winding tightening is a phenomenon in which the uppermost surface of the rolled film is dented by being tightened in a rolled state.

Comparative Example 2

An acrylic resin film was prepared in the same manner as in Example 1 except that the amount of stearic acid added was changed from 0.05 part to 0.10 part, and wound on a core having a diameter of 6 inches. When the film is stored for 3 months in the wound state in the core in this way, there is no tightening of the wound, but bleeding out of stearic acid occurs.

Example 6

(Preparation of coating liquid for formation of antiglare layer)

Pentaerythritol triacrylate and polyfunctional urethane acrylate (the reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate), the former / the latter weight ratio being 60/40, the total concentration of both being 60% , And a photo-curable resin composition which is dissolved in ethyl acetate so as to contain a leveling agent is prepared. The pentaerythritol triacrylate and the polyfunctional urethane acrylate constituting the photo-curing resin composition are collectively referred to as " curable acrylate ". 5 parts of methyl methacrylate / styrene copolymer resin particles having an average particle diameter of 2.7 mu m were added to 100 parts of the curable acrylate of the photo-curing resin composition and dispersed. When the total concentration of the curable acrylate and the resin particles was 30 %. ≪ / RTI > Thereafter, 1 part of "IGACURE 184" (manufactured by Chiba), which is a photopolymerization initiator, was added to 100 parts of the curable acrylate in this liquid to prepare a coating liquid for forming an antiglare layer.

The refractive index of the resin cured by ultraviolet irradiation was 1.53, while the refractive index of the methacrylate / styrene copolymer resin particles was 1.49. Therefore, the refractive index difference between the two was 0.04.

(Fabrication of flame-retardant film)

The coating liquid for forming an antiglare layer prepared as described above was applied to the surface of each acrylic resin film produced in Examples 1, 4 and 5 so as to have a dry film thickness of 3.4 탆 after drying, and then dried in a dryer set at 60 캜 for 3 minutes And the coated film was dried. After drying, the coating layer of the photocurable resin composition was cured by irradiating light from a high-pressure mercury lamp of intensity 20 mW / cm 2 with a h-line converted light quantity of 200 mJ / cm 2 from the coating film side of the film, Thereby forming a light-shielding film having an antiglare layer having irregularities on its surface. The obtained antiglare film was wound on a core having a diameter of 6 inches. The haze value of each of the retardation films was measured using a haze meter. As a result, the haze value was 11.5% regardless of which acrylic resin film was used.

As a result of storage of the light-shielding film in the state of being wound around the core for 3 months, no tightening was observed and any bleeding out of stearic acid was not observed in any acrylic resin film after storage for 3 months.

Example 7

(Production of polarizing plate)

On one side of a polarizing film having a thickness of about 30 占 퐉 in which iodine was adsorbed and oriented on polyvinyl alcohol, the respective antiglare films produced in Example 6 were laminated on the side of the acrylic resin film and on the other side of the polarizing film, When a cellulose film, a norbornene-based resin film or a polypropylene-based resin film (each of which may have a retardation) is bonded via an adhesive agent, a polarizing plate polarizing plate preferably used in a liquid crystal display device is obtained.

Claims (7)

An acrylic resin composition comprising 100 parts by weight of an acrylic resin composition and 0.01 to 0.09 part by weight of a lubricant, wherein the acrylic resin composition comprises a transparent acrylic resin and rubber elastomer particles having an average particle diameter of 10 to 300 nm, The content of the rubber elastomer particles is 25 to 45 wt% in the acrylic resin composition. The optical film according to claim 1, wherein the lubricant is a stearic acid compound. The optical film according to any one of claims 1 to 4, wherein the ultraviolet absorber is contained in the resin binder composition and the transmittance at a wavelength of 380 nm is 25% or less. An antireflection film comprising an antiglare layer formed on a surface of an optical film according to any one of claims 1 to 3. The antiglare layer according to claim 4, wherein the antiglare layer is formed from a composition comprising 100 parts by weight of a transparent resin and 3 to 30 parts by weight of fine particles having an average particle diameter of 0.5 to 5 占 퐉 and a refractive index difference from the transparent resin of 0.02 to 0.2, ~ 50%. A polarizing plate comprising a polarizing film made of a polyvinyl alcohol-based resin and the optical film according to any one of claims 1 to 3 bonded to the polarizing film. A polarizing plate comprising a polarizing film made of a polyvinyl alcohol resin and the retardation film according to claim 4 or 5 bonded to the polarizing film on the side opposite to the antiglare layer.