KR20190085373A - Coating composition, polarizer protecting film, manufacturing method of polarizer protecting film, polarizing plate comprising same and liquid crystal display device comprising same - Google Patents

Abstract

The present invention relates to a polarizer protection film including a coating composition or a cured product thereof, and a liquid crystal display device including the same, comprising a base film; and a polarizer protection film comprising a coating layer provided on one surface or both sides of the base film comprises the coating layer which is a cation curable resin, one or more aliphatic hydrocarbon compound selected from a group consisting of C_12 to C_30 aliphatic hydrocarbon compounds having -OH and C_15 to C_30 aliphatic hydrocarbon compounds having -SH, and a cationic initiator. Therefore, an objective of the present invention is to solve a damage of the polarizer protection film of a lower polarizing plate.

Description

TECHNICAL FIELD [0001] The present invention relates to a coating composition, a polarizer protective film, a method for producing a polarizer protective film, a polarizing plate including the same, and a liquid crystal display device including the polarizer protective film. SAME}

The present invention relates to a coating composition, a polarizer protective film, a method for producing a polarizer protective film, a polarizing plate including the same, and a liquid crystal display device including the polarizing plate and the polarizing plate, which can exhibit excellent physical and optical characteristics, To a polarizer protective film.

BACKGROUND ART [0002] Liquid crystal display devices are widely used from cellular phones and portable electronic devices to personal computers and large-sized electronic devices such as televisions, and their use is one of the ever-expanding flat panel displays. Since such a liquid crystal display device is not a self-luminous type device, a light source such as a backlight unit is usually placed on the back of a lower polarizer plate provided on the lower side of the liquid crystal cell, and the light emitted from the light source is transmitted through the liquid crystal cell, So that an image is displayed.

In recent years, a large load has been applied to the central portion of the liquid crystal cell, and a sagging phenomenon of the lower polarizer is generated. Thus, the polarizer protective film of the lower polarizer attached to the liquid crystal cell And the lower polarizing plate is caught by the diffusion sheet on the surface of the backlight unit. To solve this problem, a method of coating a hard coating layer on a protective film of a lower polarizer plate has been proposed, but there is a problem of an increase in process cost.

According to this necessity, there is a demand for a method that can reduce the cost of the process, thereby making it possible to prevent damage to the lower polarizer while maintaining price competitiveness.

Korean Laid-Open Publication No. 2012-0107256

Disclosed is a polarizer protective film of a lower polarizer. The polarizer protective film has excellent coating properties, a high surface hardness and a scratch resistance, a polarizer having excellent physical and optical properties, A liquid crystal display device is provided.

One embodiment of the present application relates to a substrate film; And a coating layer provided on one surface or both surfaces of the base film,

Wherein the coating layer comprises a cationically curable resin; At least one aliphatic hydrocarbon compound selected from the group consisting of C ₁₂ to C ₃₀ aliphatic hydrocarbon compounds having -OH and C ₁₅ to C ₃₀ aliphatic hydrocarbon compounds having -SH; And a cationic initiator, or a cured product of the polarizing protective film.

Another embodiment includes a cationically curable resin; At least one aliphatic hydrocarbon compound selected from the group consisting of C ₁₂ to C ₃₀ aliphatic hydrocarbon compounds having -OH and C ₁₅ to C ₃₀ aliphatic hydrocarbon compounds having -SH; And a cationic initiator.

Another embodiment provides a method comprising: applying a coating composition on at least one side of a substrate film according to one embodiment of the present application; And a step of stretching and curing the base film coated with the coating composition.

Another embodiment includes a polarizer; And a polarizer protective film according to an embodiment of the present application on at least one side of the polarizer.

Finally, one embodiment of the present application relates to a liquid crystal cell comprising: a liquid crystal cell; An upper polarizer provided on an upper portion of the liquid crystal cell; A lower polarizer disposed on a lower portion of the liquid crystal cell; And a backlight unit provided on a lower portion of the lower polarizer, wherein the lower polarizer comprises a polarizer; And a polarizer protective film according to an embodiment of the present application disposed on one side or both sides of the polarizer.

The coating composition of the present invention comprises at least one aliphatic hydrocarbon compound selected from the group consisting of C ₁₂ to C ₃₀ aliphatic hydrocarbon compounds having -OH and C ₁₅ to C ₃₀ aliphatic hydrocarbon compounds having -SH, When used as a protective film, provides a polarizer protective film having particularly excellent coating blasting characteristics and diffusing plate blasting characteristics.

In addition, since the polarizer protective film is used as a protective film of the lower polarizer, the polarizer protective film is damaged by abutting against the diffusion sheet on the surface of the backlight unit due to deflection of the lower polarizer, Excellent optical properties can be exhibited.

1 is a view illustrating a liquid crystal display device according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to explain the present invention in more detail to those skilled in the art.

The present invention relates to a polarizer protective film adjacent to a backlight unit of a lower polarizer plate provided in a lower portion of a liquid crystal cell in a liquid crystal display device, wherein the polarizer protective film comprises a C ₁₂ to C ₃₀ aliphatic hydrocarbon compound having -OH, And at least one aliphatic hydrocarbon compound selected from the group consisting of a C ₁₅ to C ₃₀ aliphatic hydrocarbon compound having an SH and an aliphatic hydrocarbon compound.

The aliphatic hydrocarbon compound is characterized by having a long chain aliphatic hydrocarbon compound having a functional group (-SH or -OH). By including a long chain aliphatic hydrocarbon compound, the curing rate is increased The arrangement of the aliphatic hydrocarbon compound is maintained constant, and thus a polarizer protective film excellent in fracture characteristics can be provided compared with the case where a short chain aliphatic hydrocarbon compound is contained.

In addition, the polarizer protective film made of the coating composition of the present invention can prevent damage that may occur due to the sagging phenomenon of the lower polarizer.

1 shows an embodiment of a liquid crystal display device according to the present invention. The liquid crystal display device shown in Fig. 1 includes a liquid crystal cell 20; An upper polarizer plate 10 provided on an upper portion of the liquid crystal cell 20; A lower polarizer plate 30 provided on a lower portion of the liquid crystal cell 20; And a backlight unit 40 provided on a lower portion of the lower polarizer plate. The polarizer protection film 34 is provided on the lower polarizer plate 30 adjacent to the backlight unit.

In the present invention, the terms 'upper surface' and 'upper' mean a surface or a direction arranged toward a viewer side, that is, a viewer side when a polarizing plate is mounted on a device such as a liquid crystal display device. Conversely, 'under' and 'under' mean the face or direction opposite the viewer, that is, facing the backlight unit when the polarizer is mounted on the device.

Hereinafter, the coating composition, the polarizer protective film, the method for producing the polarizer protective film, the polarizer including the polarizer protective film, and the liquid crystal display including the polarizer will be described in detail.

One embodiment of the present application relates to a positive curable resin; At least one aliphatic hydrocarbon compound selected from the group consisting of C ₁₂ to C ₃₀ aliphatic hydrocarbon compounds having -OH and C ₁₅ to C ₃₀ aliphatic hydrocarbon compounds having -SH; And a cationic initiator.

In one embodiment of the present application, the cationically curable resin comprises an epoxy compound or an oxetane compound.

According to one embodiment of the present application, the weight average molecular weight of the epoxy compound is not particularly limited, but may be about 100 to 5,000 g / mol, or about 200 to 5,000 g / mol. If the weight average molecular weight of the epoxy compound is too large, the viscosity may be high and the coating property may be poor. If the weight average molecular weight is too small, the hardness is low.

The epoxy-based compound contains at least one epoxy group and is cured by the cation generated from the cationic initiator. As the binder, an aromatic epoxy compound, a hydrogenated epoxy compound, an alicyclic epoxy compound, an aliphatic epoxy compound , And preferably an alicyclic epoxy compound can be used.

In one embodiment of the present application, the epoxy compound is an alicyclic epoxy compound.

In one embodiment of the present application, the alicyclic epoxy compound may be Celloxide 2021P, CELLOXIDE 2081 or S28, but is not limited thereto.

The aromatic epoxy compound refers to an epoxy compound containing at least one aromatic hydrocarbon ring in the molecule and includes, for example, diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F , Bisphenol-type epoxy resins such as diglycidyl ether of bisphenol S; Phenol novolak epoxy resin, cresol novolak epoxy resin, and hydroxybenzaldehyde phenol novolak epoxy resin, glycidyl ether of tetrahydroxyphenylmethane, glycidyl ether of tetrahydroxybenzophenone, epoxy And polyvinylphenol, and the like.

The hydrogenated epoxy compound refers to an epoxy compound obtained by selectively hydrogenating the aromatic epoxy compound under a pressure in the presence of a catalyst, but is not limited thereto. Of these, the hydrogenated bisphenol A It is preferable to use diglycidyl ether.

The alicyclic epoxy compound means an epoxy compound in which an epoxy group is formed between adjacent two carbon atoms constituting an aliphatic hydrocarbon ring, but is not limited thereto. For example, 2- (3, Epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, 3,4,5- Epoxy-6-methylcyclohexylmethyl-3,4-epoxy-6-methylcyclohexanecarboxylate, vinylcyclohexanedioxide, bis (3,4-epoxycyclohexylmethyl) adipate, bis Epoxycyclohexylmethyl) adipate, exo-exobis (2,3-epoxycyclopentyl) ether, endo-exobis (2,3-epoxycyclopentyl) ether, 2,2-bis [4 - (2,3-epoxypropoxy) cyclohexyl] propane, 2,6-bis (2,3-epoxypropoxycyclohexyl-p-dioxane), 2,6- Bis (3,4-epoxycyclohexyl) propane, dicyclopentadienedioxide, 1,2-epoxy-6- (2,3-epoxypropoxy) ), Hexahydro-4,7-methanoindane, p- (2,3-epoxy) cyclopentylphenyl-2,3-epoxypropyl ether, 1- (2,3-epoxypropoxy) (2,3-epoxy) cyclopentylphenyl-2,3-epoxypropyl ether), 1,2-bis [5- (1,2-epoxy) (3,4-epoxycyclohexane) ethylene glycol di (3,4-epoxycyclohexylmethyl) ether, ethylenebis (3, 4-ethoxycyclohexylmethane) ethanocyclopentenylphenyl glycidyl ether, (3 to 20) alcohols (GR, TMP, PE, DPE (1 to 10 moles) and 3,4-epoxycyclohexanecarboxylate , Hexapentaerythritol), and the like. Among them, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate is particularly preferably used from the viewpoint of reactivity.

In one embodiment of the present application, the aliphatic hydrocarbon compound may be a C ₁₂ to C ₃₀ aliphatic hydrocarbon compound having -OH or a C ₁₅ to C ₃₀ aliphatic hydrocarbon compound having -SH.

In one embodiment of the present application, the aliphatic hydrocarbon compound may be a C ₁₂ to C ₃₀ aliphatic hydrocarbon compound having -OH.

In another embodiment, the aliphatic hydrocarbon compound may be a C ₁₂ to C ₂₅ linear or branched alkyl group having -OH.

In one embodiment of the present application, the aliphatic hydrocarbon compound may be a C ₁₅ to C ₃₀ aliphatic hydrocarbon compound having -SH.

In another embodiment, the aliphatic hydrocarbon compound may be a C ₁₅ to C ₂₅ linear or branched alkyl group having -SH.

In one embodiment of the present application, the aliphatic hydrocarbon compound is selected from the group consisting of lauryl alcohol; Hexadecyl mercaptan; Or 2-decyl-1-tetradecanol.

The aliphatic hydrocarbon compound is characterized by having a long chain aliphatic hydrocarbon compound having a functional group (-SH or -OH). By including a long chain aliphatic hydrocarbon compound, the curing rate is fast The arrangement of the aliphatic hydrocarbon compound is maintained constant, and thus a polarizer protective film excellent in fracture characteristics can be provided compared with the case where a short chain aliphatic hydrocarbon compound is contained.

If the length of the chain is short, it is difficult to ensure reproducibility because the amount of evaporation during stretching is large, and the arrangement of the aliphatic hydrocarbon compound is not easily tangled and is not suitable for improvement of scratching. Furthermore, the aliphatic hydrocarbon compound according to one embodiment of the present application is advantageous in the case of a cyclic aliphatic hydrocarbon compound having a functional group (-SH or -OH) in terms of particle arrangement, and the smaller the side chain,

In one embodiment of the present application, the cationic initiator is a compound that produces a cationic species or Lewis acid by irradiation of an active energy ray such as ultraviolet rays, and is a compound that acts on a cationic polymerizable group such as an epoxy group to initiate a cationic polymerization reaction it means.

In one embodiment of the present application, the cationic initiator comprises a sulfonium salt or an iodonium salt.

In one embodiment of the present application, the cationic initiator is for improving the curing rate by promoting the polymerizability. As the cationic polymerization initiator, a cationic initiator generally used in the art can be used without limitation have.

In one embodiment of the present application, the cationic initiator comprises a cationic thermal initiator or a cationic photoinitiator. It is preferable that the cationic thermal initiator has a starting temperature of 60 DEG C or higher and 150 DEG C or lower when initiated.

When the temperature at the time of opening is within the above-mentioned range, it is suitable because the curing does not proceed during the mixing of the coating liquid, the time required for curing is the most excellent, and the curing rate is appropriate during drawing.

The cationic thermal initiator comprises a sulfonium salt or an iodonium salt and is selected from the group consisting of Sanaid SI B3A ((4-acetoxyphenyl) benzyl (methyl) sulfonium, tetrakis (pentafluorophenyl) (Benzyl (4-hydroxyphenyl) methylsulfonium, tetrakis (pentafluorophenyl) borate (1: (4-hydroxyphenyl) methylsulfonium, tetrakis (pentafluorophenyl) borate (1: 1)), Sanaid SI-80 Hydroxyphenyl (2-methylbenzyl) methylsulfonium hexafluoroantimonate), Sanaid SI-100 (benzyltetramethylenesulfonium hexafluoroantimonate), Sanaid SI-110, Sanaid SI 360 ((4-hydroxyphenyl) methyl (1-naphthalenylmethyl) sulfonium, (4-hydroxyphenyl) methyl (1-naphthalenylmethyl) sulfonium, hexafluorophosphate Specific examples of the cationic polymerization initiator including a sulfonium salt or an iodonium salt include diphenyl (4-phenylthio) phenylsulfonium hexa Phenyl (4-phenylthio) phenylsulfonium hexafluoroantimonate, diphenyl (4-phenylthio) phenylsulfonium hexafluorophosphate, phenyl 4- [2- (Methyl) propyl) phenyl] -iodonium hexafluorophosphate, (thiodi-4,1-phenylene) bis (diphenylsulfonium) di (Thiodi-4,1-phenylene) bis (diphenylsulfonium) dihexafluoroantimonate and (thiodi-4,1-phenylene) bis (diphenylsulfonium) dihexafluorophosphate , 1-phenylene) bis (diphenylsulfonium) dihexafluorophosphate) Although the number of, and the like.

In one embodiment of the present application, 55 to 95 parts by weight of the cationically curable resin based on 100 parts by weight of the coating composition; 0.3 to 40 parts by weight of the aliphatic hydrocarbon compound; And 0.05 to 10 parts by weight of the cationic initiator.

In one embodiment of the present application, the cationically curable resin may be 55 to 95 parts by weight, preferably 60 to 95 parts by weight, more preferably 65 to 90 parts by weight based on 100 parts by weight of the coating composition.

In one embodiment of the present application, the aliphatic hydrocarbon compound may be used in an amount of 0.3 to 40 parts by weight, preferably 0.4 to 35 parts by weight, based on 100 parts by weight of the coating composition.

In one embodiment of the present application, the cationic initiator may be 0.05 to 10 parts by weight, preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the coating composition.

When the content of the cationic initiator falls within the above range, the speed of the curing process during or after the stretching is suitable, and the curing is not excessively cured and the stretching becomes uniform.

In one embodiment of the present invention, the coating composition further comprises a silicon-based or fluorine-based compound.

Examples of the silicon-based compound include a non-reactive silicone compound having a silicon group such as dimethylsiloxane and methylsiloxane and containing an alkyl group, a polyether group or the like; Or a reactive silicone compound having a silicon group and containing a vinyl group, a (meth) acrylate group, or a (meth) acryloxy group; (Meth) acrylate group, a (meth) acryloxy group, and the like. The reactive silicone compound having a silicon group and containing a vinyl group, a (meth) acrylate group, Can be used.

Examples of the fluorine compound include a non-reactive fluorine compound having a fluorine group such as a fluoroalkyl group; Or a reactive fluorine compound having a fluorine group and containing a vinyl group, a (meth) acrylate group, or a (meth) acryloxy group; A resin having a fluorine group, an oil or a surfactant, but the present invention is not limited thereto.

According to one embodiment of the present invention, the silicon-based or fluorine-based compound is used in an amount of about 0.2 parts by weight or more, or about 0.3 parts by weight or more, or about 0.5 parts by weight, or about 1 part by weight Or less, about 10 parts by weight or less, or about 8 parts by weight or less, or about 6 parts by weight or less. If the content of the silicon-based or fluorine-based compound is too small, the scratch resistance effect may be low. If the content is too large, the strength of the polarizer protective film may be lowered.

According to one embodiment of the present invention, the cationically curable resin of the coating composition may further comprise an oxetane-based compound.

The oxetane-based compound contains at least one oxetane group, and is cured by the cation generated from the cationic thermal initiator by heat treatment. The kind of the binder is not particularly limited.

The oxetane-based compound can lower the viscosity of the coating composition and can further improve the curing rate.

More specifically, the oxetane-based compound may be, for example, 3-ethyl-3 - [(3-ethyloxetan-3-yl) methoxymethyl] oxetane, 1,4-bis [ 3-yl) methoxy] benzene, 1,3-bis [(3-ethyloxetan-3-yl) Methoxy] benzene, 4,4'-bis [(3-ethyloxetan-3-yl) methoxy] biphenyl, Bis [(3-ethyloxetan-3-yl) methoxy] biphenyl, 3,3 ', 5,5'-tetramethyl-4,4'- 3-yl) methoxy] biphenyl, 2,7-bis [(3-ethyloxetan-3- yl) methoxy] naphthalene, bis {4- [ Methoxy] phenyl} methane, 2,2-bis {4 - [(3-ethyloxetan-3-yl) methane] Ethoxy] phenyl} propane, 3-chloromethyl-3-ethyloxetane etherified product of novolac phenol-formaldehyde resin, 3 (4) Yl) methoxymethyl] -tricyclo [5. 2.1.0 2,6] decane, 2,3-bis [(3-ethyloxetan-3-yl) methoxymethyl] norborane, 1,1,1-tris [ (Methoxymethyl) propane, 1-butoxy-2,2-bis [(3-ethyloxetan-3- yl) methoxymethyl] Ethyl} oxetan-3-yl) methoxy] ethylthio} ethane, bis {[4- Cetan-3-yl) methoxy] -2,2,3,3,4,4,5,5-octafluorohexane.

According to one embodiment of the present invention, there is provided a process for preparing 3-ethyl-3- (hydroxymethyl) oxetane, m-tetramethyl-xylene diisocyanate azelaic chloride, terephthaloyl chloride and 1,3,5- And tricarbonyl trichloride can be used as the compound of the present invention.

When the oxetane-based compound is further included, the content thereof may be about 5 to about 80 parts by weight, and preferably about 10 to about 60 parts by weight based on 100 parts by weight of the epoxy compound. When the oxetane-based compound is contained in an excessively large amount, the hardness of the coating layer after curing may be lowered. When the content of the oxetane-based compound is too small, the effect of addition of the oxetane-based compound is insignificant.

According to one embodiment of the present invention, the coating composition may comprise a photocurable binder. If the coating composition comprises a photocurable binder, a UV curing process may be added during curing of the coating composition. At this time, the ultraviolet irradiation amount of the UV curing process may be 20 to 800 mJ / cm ² . The light source for ultraviolet irradiation is not particularly limited as long as it can be used in the technical field to which the present technology belongs. For example, a high pressure mercury lamp, a metal halide lamp, a black light fluorescent lamp and the like can be used.

The coating composition of the present invention is low in viscosity and good in coatability and can be used in a solvent-free type without a solvent. However, it does not exclude the use of an organic solvent, and may contain a small amount of an organic solvent generally used in the art if necessary. At this time, the organic solvent may be used in an amount of about 20 parts by weight or less based on 100 parts by weight of the coating composition for the entire polarizer protective film.

Examples of usable organic solvents include alcohol solvents such as methanol, ethanol, isopropyl alcohol and butanol, alkoxy alcohol solvents such as 2-methoxyethanol, 2-ethoxyethanol and 1-methoxy-2-propanol, , Ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, methyl propyl ketone and cyclohexanone, propylene glycol monopropyl ether, propylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl Ether-based solvents such as ether, diethylene glycol monomethyl ether, diethyl glycol monoethyl ether, diethyl glycol monopropyl ether, diethyl glycol monobutyl ether and diethylene glycol-2-ethylhexyl ether, benzene, toluene, Aromatic solvents such as rhenium, and the like may be used alone or in combination.

According to an embodiment of the present invention, the coating composition may further include organic fine particles or inorganic fine particles to improve the hardness of the drawn coating layer. The particle size of the organic or inorganic fine particles may be 10 mu m or less in terms of proper haze and coating thickness, more specifically 10 nm to 10 mu m, preferably 50 nm to 5 mu m, more preferably 100 nm to 3 mu m Lt; / RTI >

The organic fine particles or the inorganic fine particles are not limited as long as they are used for forming a coating layer.

The organic fine particles may be at least one selected from organic fine particles made of an acrylic resin, a styrene resin, an epoxy resin and a nylon resin.

More specifically, the organic fine particles may be at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl Acrylate, stearyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, n-octyl (meth) acrylate, Acrylates such as polyethylene glycol (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, glycidyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl But are not limited to, methylstyrene, m-methylstyrene, p-ethylstyrene, m-ethylstyrene, p-chlorostyrene, m- chlorostyrene, p- chloromethylstyrene, m- chloromethylstyrene, styrenesulfonic acid, m-butoxystyrene, vinyl acetic acid (Meth) acrylonitrile, (meth) acrylonitrile, vinyltoluene, vinyltoluene, vinyltoluene, vinyl propionate, vinyl butyrate, vinyl ether, allyl butyl ether, allyl glycityl ether, (meth) acrylic acid, maleic acid, And (meth) acrylate, but the present invention is not limited thereto.

The organic fine particles may be selected from the group consisting of polystyrene, polymethyl methacrylate, polymethyl acrylate, polyacrylate, polyacrylate-co-styrene, polymethyl acrylate-co-styrene, polymethyl methacrylate- Polyvinyl chloride resin, polycarbonate resin, polyvinyl chloride resin, polybutylene terephthalate, polyethylene terephthalate, polyamide resin, polyimide resin, polysulfone, polyphenylene oxide, polyacetal, epoxy resin, phenol resin, silicone resin, melamine resin, One or more members selected from the group consisting of amine, polydivinylbenzene, polydivinylbenzene-co-styrene, polydivinylbenzene-co-acrylate, polydiallyl phthalate and triallyl isocyanurate polymer, A copolymer may be used, but the present invention is not limited thereto.

The inorganic fine particles may be at least one selected from the group consisting of inorganic fine particles of silicon oxide, titanium dioxide, indium oxide, tin oxide, zirconium oxide and aluminum oxide, but the present invention is not limited thereto.

The total content of the organic and inorganic fine particles may be in the range of 0.1 to 20 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the cationically curable coating composition. When the total content of the organic and inorganic fine particles is less than 0.1 part by weight based on 100 parts by weight of the cationically curable composition, the effect of improving the hardness and scratch resistance is insignificant. When the total content of the organic and inorganic fine particles is more than 20 parts by weight, The coating property becomes poor and the haze value due to the internal scattering becomes too large and the contrast ratio may be lowered.

Meanwhile, the coating composition of the present invention can be used in a wide range of applications such as surfactants, antioxidants, UV stabilizers, leveling agents, antifouling agents, antistatic agents, UV absorbers, antifoaming agents, It may further comprise an additive. The content can be varied within a range that does not deteriorate the physical properties of the coating composition of the present invention. Therefore, it may be included in an amount of about 0.1 to about 10 parts by weight based on 100 parts by weight of the total coating composition, have.

In one embodiment of the present application, a substrate film; And a coating layer provided on one surface or both surfaces of the base film, wherein the coating layer comprises a cationically curable resin; A C ₁₅ to C ₃₀ aliphatic hydrocarbon compound having -OH or -SH; And a polarizer protective film comprising a cationic initiator.

In one embodiment of the present application, the positive-curing resin comprises an epoxy-based compound.

The weight average molecular weight of the epoxy compound may be 100 to 5,000 g / mol.

Wherein the epoxy compound is an alicyclic epoxy compound.

In one embodiment of the present application, 55 to 95 parts by weight of the cation-curable epoxy resin, based on 100 parts by weight of the coating composition; 0.3 to 40 parts by weight of the compound; And 0.1 to 10 parts by weight of the cationic initiator.

In one embodiment of the present application, the cationic initiator comprises a sulfonium salt or an iodonium salt.

In one embodiment of the present application, the thickness of the coating layer is 100 nm or more and 10 m or less.

In still another embodiment, the thickness of the coating layer may be 80 nm or more and 8 占 퐉 or less, preferably 70 nm or more and 7 占 퐉 or less.

When the coating layer has the above-mentioned thickness range, it is possible to provide a protective film which is excellent in coating adhesion to a base film and is particularly excellent in coating blasting characteristics and diffusing plate blasting characteristics. Particularly, if the thickness of the coating layer is thin, the breaking property is weakened, and if it is thick, the breaking property can not be further improved, which is disadvantageous for thinning. As such, the protective film can be manufactured in a thin shape and exhibits sufficient strength. In addition, even a single coating layer can exhibit sufficient hardness and scratch resistance, and exhibits high adhesiveness to a substrate without a primer layer, so that workability and productivity of the manufacturing process are high.

According to one embodiment of the present application, there is provided a method of manufacturing a semiconductor device, comprising: applying a coating composition according to one embodiment of the present application on at least one side of a substrate film; And a step of stretching and curing the base film coated with the coating composition.

When a solvent is contained in the coating composition according to one embodiment of the present application, a drying process may be applied between the application of the coating composition and the step of stretching the base film to which the coating composition is applied for removal of the solvent, The solvent may also be removed.

The method of applying the coating composition is not particularly limited as long as it can be used in the technical field to which the present technology belongs. Examples of the coating method include bar coating method, knife coating method, roll coating method, blade coating method, die coating method, micro gravure coating method , A comma coating method, a slot die coating method, a lip coating method, or a solution casting method.

In one embodiment of the present application, the stretching ratio in the step of stretching and curing the base film is 1.05 to 10 times the length in the stretching direction.

In one embodiment of the present application, the method further comprises a step of stretching the base film before the step of applying the coating composition on one side of the base film.

When the base film is uniaxially stretched before application of the coating composition, it is preferable that the stretching direction after the coating is stretched in the direction perpendicular to the stretching direction before coating the coating composition. For example, if the base film is stretched in the MD direction before application of the coating composition, it may be stretched in the width direction (TD) after application of the coating composition.

When the coating composition is stretched before and after coating, the total stretching ratio is at least 1.1 times, or at least 1.2 times, or at least 1.5 times, at least 25 times, or at most 10 times the total stretching area of the substrate film, Fold or less, or 7 times or less. When the stretching ratio is less than 1.1 times, the effect of stretching may not be sufficiently achieved, and when the stretching ratio is more than 25 times, the coating layer may be cracked.

Before the stretching, the coating surface of the coating composition may be planarized and dried to volatilize the solvent contained in the coating composition.

The polarizer protective film of the present invention is used for protecting the polarizer from the outside, and at least one surface of the polarizer , Preferably as a lower protective film of the polarizer.

On the other hand, as the liquid crystal display device becomes larger and slimmer, a sagging phenomenon of the lower polarizer plate occurs, and the lower protective film of the lower polarizer plate comes into contact with the backlight unit, causing scratches.

Accordingly, the polarizer protective film obtained by the production method of the present invention exhibits excellent physical properties such as scratch resistance and hardness due to the stretched coating layer, thereby effectively protecting the lower polarizer, and being applicable to a polarizer for a liquid crystal display device .

The base film is not particularly limited, but may be a polyester, a polyethylene, a cyclic olefin polymer (COP), a cyclic olefin copolymer (COC), a polyacrylate , PAC), polycarbonate (PC), polymethylmethacrylate (PMMA), polyimide (PI), or cellulose.

The thickness of the base film is not particularly limited, but a film having a thickness of about 50 to 1,000 占 퐉, specifically 100 to 500 占 퐉 may be used in consideration of the subsequent stretching process.

The method for forming the base film is not particularly limited, and an unstretched base film can be prepared by a suitable film forming method such as a solution casting method, a melt extrusion method, a calendering method, and a compression molding method.

When the base film is stretched, if the polymer is rearranged in the stretching process and a functional coating layer or the like is further formed on the stretched base film, there is a problem that the adhesion is reduced. Therefore, there is a method of adding a separate process such as forming a primer layer for securing adhesion or adding a functional compound capable of improving adhesion to the coating layer. In this case, a separate process is added in the manufacturing process, There is a problem in that the development of universal primers is difficult due to physical and chemical properties of each film. Further, adding a functional compound to the coating layer may also cause a problem of cost increase and other property deterioration.

Accordingly, the present invention has been made to solve the above problems, and it is possible to provide a polarizer protective film having sufficient scratch resistance and thinness even without a separate primer layer according to an embodiment of the present invention.

According to one embodiment of the present invention, the base film can apply the coating composition on one side thereof in an unstretched state.

In another embodiment, the substrate film may be subjected to uniaxial stretching prior to application of the coating composition.

At this time, the stretching direction is not particularly limited, and it may be stretched in the width direction (TD) direction or the length (MD) direction, and may be uniaxially stretched or biaxially stretched. The stretching ratio can be stretched so as to be 1.1 times or more, 1.2 times or 1.5 times or more, 5 times or less, or 3 times or less based on the length in the stretching direction.

The coating composition for a polarizer protective film according to one embodiment of the present application is applied on at least one side of the unstretched or uniaxially stretched base film.

Generally, in order to form a functional coating layer such as a hard coating layer on a polarizer protective film, a method of applying a coating composition on a base film, drying and curing it is used. However, in the case of the base film, since the polymer is rearranged in the stretching process, there is a problem that the coating layer does not adhere well to the base film. There is a method of forming a primer layer in order to ensure adhesion, however, there is a problem that productivity is lowered due to the addition of a separate step in the manufacturing process, and there is a problem that development of a general purpose primer is difficult.

According to the production method of the present invention, the coating composition is applied onto the base film and simultaneously stretched and cured to form a coating layer, whereby adhesion to the stretched base film is high without requiring a separate primer layer, It is possible to provide a polarizer protective film as much as possible.

On the other hand, when the coating composition is too rigid, there is a problem that the coating layer becomes uneven or the drawing is not performed properly in the drawing process after coating. On the contrary, when the coating composition is flexible and the drawing rate is too high, And scratch resistance can not be ensured.

Therefore, in order to exhibit sufficient scratch resistance after a uniform stretching process and curing, it is important to appropriately adjust the flexibility and strength of the coating composition in addition to the control of the draw ratio of the base film.

Thus, according to the production method of the present invention, it is possible to provide a polarizer protective film that satisfies the above-mentioned requirements by optimizing the composition of the coating composition and the stretching process.

The coating layer may be formed on only one side of the base film, or may be formed on both sides of the base film.

When the coating layer is formed only on one side of the stretched base film, the other side may further include another photocurable coating layer and / or a thermosetting coating layer or other layers, films, or films for imparting functionality have. It is also possible to further form another functional layer on the coating layer.

As such, when the protective film of the present invention includes another layer, film or film or the like on the other surface of the stretched base film, the forming method and the step are not limited. For example, a method of coating the base film before stretching and curing after stretching, a method of coating and curing after stretching the base film, a method of coating a layer, a film, or a film formed separately using an adhesive, Film or film may be laminated on the other surface of the stretched substrate film by various methods known in the art, such as a method of laminating the stretched substrate film to the substrate.

The polarizer protective film of the present invention is obtained by connecting a sample to a vibration generator and superimposing the sample and the diffusion sheet in contact with each other so that the vibration is applied for a predetermined time in a state of applying a load and then checking the surface of the polarizer protective film, Can be evaluated.

Further, the polarizer protective film obtained by the production method of the present invention may have a pencil hardness of H or higher at a load of 500 g.

In one embodiment of the present application, a polarizer; And a polarizer protective film according to an embodiment of the present application on at least one side of the polarizer.

At this time, the polarizer is not particularly limited, and a film made of polyvinyl alcohol (PVA) including a polarizer well-known in the related art, for example, iodine or a dichroic dye, is used.

The polarizer vibrates in various directions and exhibits a characteristic of extracting only light vibrating in one direction from the incident light. This property can be achieved by stretching polyvinyl alcohol (PVA) absorbing iodine with a strong tension. For example, more specifically, there is a method comprising swelling a PVA film by swelling in an aqueous solution, dyeing the swollen PVA film with a dichroic material imparting polarizing properties, stretching the dyed PVA film, ) To align the dichroic dye materials in the stretching direction, and a polarizing step for correcting the color of the PVA film after the stretching step. However, the polarizing plate of the present invention is not limited thereto.

According to an embodiment of the present invention, the polarizer protective film may be attached to both surfaces of the polarizer.

When the polarizer protective film of the present invention is laminated on the polarizer and adhered, it is preferable that the base film is attached to the polarizer.

According to another embodiment of the present invention, the polarizer protective film is provided on only one side of the polarizer, and the general protective film commonly used for protecting the polarizer may be provided on the other side.

At this time, the polarizing plate can be used as a lower polarizing plate of an LCD, and the polarizing plate protective film of the present invention can be positioned at a lower position in a laminated structure in an LCD.

As described above, when the polarizer protective film is laminated on the LCD and the polarizer is laminated on the LCD, the lower protective film of the polarizer is damaged by abutting against the backlight unit provided under the polarizer, thereby preventing the haze from increasing, have.

The polarizer and the polarizer protective film can be bonded by lamination using an adhesive or the like. Usable adhesives are not particularly limited as long as they are known in the art. For example, a water-based adhesive, a one-component or two-component polyvinyl alcohol (PVA) adhesive, a polyurethane adhesive, an epoxy adhesive, a styrene butadiene rubber adhesive (SBR adhesive), a hot melt adhesive, The present invention is not limited to these examples.

When the polarizer protective film of the present invention is laminated on the polarizer and adhered to the polarizer, it is preferable that the stretched coating layer is laminated so as to be attached to the polarizer on the surface on which the stretched coating layer is not formed and the stretched coating layer is positioned outside the polarizer.

The polarizing plate having the polarizer protective film of the present invention is applied to an LCD, but the present invention is not limited thereto and can be used in various fields. For example, mobile communication terminals, smart phones, other mobile devices, display devices, electronic blackboards, outdoor electronic signboards, and various displays. According to an embodiment of the present invention, the polarizing plate may be a TN (Twisted Nematic) or STN (Super Twisted Nematic) liquid crystal polarizing plate, and may be an IPS (In-Plane Switching), a Super-IPS, a Fringe Field Switching Or a polarizing plate for the vertical alignment mode.

In one embodiment of the present application, a liquid crystal cell; An upper polarizer provided on an upper portion of the liquid crystal cell; A lower polarizer disposed on a lower portion of the liquid crystal cell; And a backlight unit provided on a lower portion of the lower polarizer, wherein the lower polarizer comprises a polarizer; And a polarizer protective film according to an embodiment of the present application disposed on one side or both sides of the polarizer.

In one embodiment of the present application, the polarizer protective film is disposed to face the backlight unit.

1 is a diagram showing a liquid crystal display device including a polarizer protective film obtained by the production method of the present invention.

The backlight unit includes a light source that emits light from the back surface of the liquid crystal panel. The type of the light source is not particularly limited, and a general LCD light source such as CCFL, HCFL, or LED can be used.

Best Mode for Carrying Out the Invention Hereinafter, the function and effect of the present invention will be described in more detail through specific examples of the present invention. It is to be understood, however, that these embodiments are merely illustrative of the invention and are not intended to limit the scope of the invention.

< Example >

Preparation of coating compositions

Manufacturing example  One.

20 g of Celloxide 2021P as an alicyclic epoxy compound, 20 g of lauryl alcohol as a long chain alcohol, 4 g of a cationic polymerization initiator Irgacure (R) 250, 1 g of isopropyl thioxanthone as a photosensitizer, 0.1 g of BYK306 0.1 g to prepare a coating composition.

Manufacturing example  2.

80 g of the alicyclic epoxy compound Celloxide 2081, 20 g of lauryl alcohol with a long chain alcohol, 4 g of a cationic polymerization initiator Irgacure 250, 1 g of isopropyl thioxanthone as a photosensitizer, 0.1 g of BYK306 0.1 as a silicone compound g to prepare a coating composition.

Manufacturing example  3.

80 g of an alicyclic epoxy compound S28, 20 g of lauryl alcohol as a long chain alcohol, 4 g of a cationic polymerization initiator Irgacure 250, 1 g of isopropyl thioxanthone as a photosensitizer, 0.1 g of BYK306 as a silicone compound To prepare a coating composition.

Manufacturing example  4.

90 g of alicyclic epoxy compound Celloxide 2021P, 10 g of 2-decyl-1-teradecanol as a long chain alcohol, 4 g of a cationic polymerization initiator Irgacure (R) 250, 1 g of isopropyl thioxanthone as a photosensitizer, 0.1 g of BYK306 as a compound are mixed to prepare a coating composition.

Manufacturing example  5.

70 g of alicyclic epoxy compound Celloxide 2021P, 30 g of hexadecyl mercapton as long chain thiol, 4 g of cationic polymerization initiator Irgacure 250, 1 g of isopropyl thioxanthone as a photosensitizer, 0.1 g of BYK306 as a silicone compound To prepare a coating composition.

Manufacturing example  6.

10 g of lauryl alcohol as a long chain alcohol, 4 g of a cationic polymerization initiator Irgacure (R) 250, 1 g of isopropyl thioxanthone as a photosensitizer and 0.1 g of BYK306 0.1 as a silicone compound were added to a cationic curable resin, 90 g of an alicyclic epoxy compound Celloxide 2021P, g to prepare a coating composition.

Manufacturing example  7.

20 g of Celloxide 2021P as an alicyclic epoxy compound, 20 g of lauryl alcohol as a long chain alcohol, 4 g of a cationic polymerization initiator Irgacure (R) 250, 1 g of isopropyl thioxanthone as a photosensitizer, 0.1 g of BYK306 0.1 g, and 0.4 g of 1.5 mu m PMMA-based organic particles were mixed to prepare a coating composition.

Manufacturing example  8.

20 g of Celloxide 2021P as an alicyclic epoxy compound, 20 g of lauryl alcohol as a long chain alcohol, 4 g of a cationic polymerization initiator Irgacure (R) 250, 1 g of isopropyl thioxanthone as a photosensitizer, 0.1 g of BYK306 0.1 g, and 0.4 g of CERAFLOUR-100 were mixed to prepare a coating composition.

Manufacturing example  9.

80 g of alicyclic epoxy compound Celloxide 2021P, 20 g of lauryl alcohol with long chain alcohol, 0.1 g of cationic polymerization initiator SANAID SI B3 and 0.1 g of BYK306 as a silicone compound were mixed with a cationic curable resin to prepare a coating composition.

Manufacturing example  10.

20 g of Celloxide 2021P as an alicyclic epoxy compound, 20 g of lauryl alcohol as a long chain alcohol, 0.1 g of a cationic polymerization initiator SANAID SI B3, 0.1 g of BYK306 as a silicone compound, and 0.4 g of CERAFLOUR-100 were mixed to prepare a coating composition Prepare.

Manufacturing example  11.

50 g of an alicyclic epoxy compound Celloxide 2021P, 50 g of lauryl alcohol as a long chain alcohol, 4 g of a cationic polymerization initiator Irgacure 250, 1 g of isopropyl thioxanthone as a photosensitizer, 0.1 g of BYK306 0.1 as a silicone compound g to prepare a coating composition.

Manufacturing example  12.

20 g of 1-octanol, 20 g of 1-octanol, 4 g of a cationic polymerization initiator Irgacure (R) 250, 1 g of isopropyl thioxanthone as a photosensitizer, and 0.1 g of BYK306 as a silicone compound were mixed with a cationic curable resin To prepare a coating composition.

Manufacturing example  13.

80 g of alicyclic epoxy compound Celloxide 2021P, 20 g of cyclohexanol, 4 g of cationic polymerization initiator Irgacure 250, 1 g of isopropyl thioxanthone as a photosensitizer and 0.1 g of BYK306 as a silicone compound were mixed with a cationic curable resin The composition is prepared.

Manufacturing example  14.

80g of Celloxide 2021P, 20g of 1-octanethiol, 4g of cationic polymerization initiator Irgacure (R) 250, 1g of isopropyl thioxanthone as a photosensitizer and 0.1g of BYK306 as a silicone compound were mixed with a cationic curable resin To prepare a coating composition.

Manufacturing example  15.

80 g of alicyclic epoxy compound Celloxide 2021P, 20 g of benzethiol, 4 g of a cationic polymerization initiator Irgacure 250, 1 g of isopropyl thioxanthone as a photosensitizer, and 0.1 g of BYK306 as a silicone compound were mixed with a cationic curable resin The composition is prepared.

Manufacturing example  16.

20 g of Celloxide 2021P, 20 g of 1-bemzemethiol, 0.2 g of a cationic polymerization initiator SANAID SI B3 and 0.1 g of BYK306 as a silicone compound were mixed with a cationic curable resin to prepare a coating composition.

Polarizer  Manufacture of protective film

Example  One.

The polymethyl methacrylate resin was subjected to a T-die-peeling process under the condition of 250 占 폚 to prepare an undrawn film having a width of 800 mm and a thickness of 200 占 퐉. The unstretched film was stretched 1.8 times in the length (MD) direction at a temperature of 135 캜 to prepare a uniaxially stretched film.

The coating composition of Preparation Example 1 was coated on the uniaxially stretched film by a bar coating method and then stretched 2.5 times in a width direction (TD) direction at a temperature of 135 ° C. The polarizer protective film on which a protective film having a thickness of 2 탆 was formed was prepared by irradiating ultraviolet rays thereto.

Example  2.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 2 was used in place of the coating composition of Production Example 1.

Example  3.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 3 was used in place of the coating composition of Production Example 1.

Example  4.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 4 was used in place of the coating composition of Production Example 1.

Example  5.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 5 was used in place of the coating composition of Production Example 1.

Example  6.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 6 was used in place of the coating composition of Production Example 1.

Example  7.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 7 was used in place of the coating composition of Production Example 1.

Example  8.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 8 was used in place of the coating composition of Production Example 1.

Example  9.

The polymethyl methacrylate resin was subjected to a T-die-peeling process under the condition of 250 占 폚 to prepare an undrawn film having a width of 800 mm and a thickness of 200 占 퐉. The unstretched film was stretched 1.8 times in the length (MD) direction at a temperature of 135 캜 to prepare a uniaxially stretched film.

The coating composition of Production Example 9 was coated on the uniaxially stretched film by a bar coating method and then stretched 2.5 times in a width direction (TD) at a temperature of 135 ° C to form a protective film having a thickness of 2 μm A polarizer protective film was prepared.

Example  10.

The polymethyl methacrylate resin was subjected to a T-die-peeling process under the condition of 250 占 폚 to prepare an undrawn film having a width of 800 mm and a thickness of 200 占 퐉. The unstretched film was stretched 1.8 times in the length (MD) direction at a temperature of 135 캜 to prepare a uniaxially stretched film.

The coating composition of Production Example 10 was coated on the uniaxially stretched film by a bar coating method and stretched 2.5 times in a width direction (TD) at a temperature of 135 ° C to form a protective film having a thickness of 2 μm A polarizer protective film was prepared.

Example  11.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 11 was used in place of the coating composition of Production Example 1.

Comparative Example  One.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 12 was used in place of the coating composition of Production Example 1.

Comparative Example  2.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 13 was used in place of the coating composition of Production Example 1.

Comparative Example  3.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 14 was used in place of the coating composition of Production Example 1.

Comparative Example  4.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 15 was used in place of the coating composition of Production Example 1.

Comparative Example  5.

A polarizer protective film was prepared in the same manner as in Example 1, except that the coating composition of Production Example 16 was used in place of the coating composition of Production Example 1.

< Experimental Example  >

<Measurement method>

The properties of the polarizer protective film of the examples were measured by the following methods.

One) Scratch resistance

(50 mm X 50 mm) to which a vibration generator was connected was placed so that the coating layer of the polarizer protective film of the examples and the comparative example was in contact with the diffusion sheet and vibration was applied with a weight of 300 g. 20-60 Hz) was applied for 240 seconds. Then scratch resistance was evaluated on the surface of the coating layer and the surface of the diffusion sheet of the polarizer protective film with or without scratches. O if there is no scratch or cracking, △ if fine scratching or cracking occurs, and X if it occurs sharply.

2) Attachment

100 (10 x 10) shears were put on the coating layer of the polarizer protective films of the examples and comparative examples according to ASTM D3359, and a tape (trade name: CT-24, manufacturer: Nichiban) was applied , And the number of coating layer chambers falling with the tape was counted.

O when the falling squares were 0 to 5, and X when the squares were 6 or more.

3) Surface Hardness

Pencil hardness was measured using a pencil hardness tester (hardness tester, manufacturer: Chungbuk Tech) under a load of 500 g. A standard pencil (Mitsubishi) was changed from 6B to 9H according to ASTM 3363-74, and the surface of the coating layer was scratched by keeping the angle of 45 degrees. Each experimental value was described as an average value after 5 measurements.

The results of the physical properties measurement are shown in Table 1 below.

Coating layer shatter characteristics Diffusion sheet shatter characteristics Attachment Surface hardness Example 1 ○ ○ 5B 1H Example 2 ○ ○ 5B 1H Example 3 ○ ○ 5B 1H Example 4 ○ ○ 5B 1H Example 5 ○ ○ 5B 1H Example 6 ○ ○ 5B 1H Example 7 ○ ○ 5B 1H Example 8 ○ ○ 5B 1H Example 9 ○ ○ 5B 1H Example 10 ○ ○ 5B 1H Example 11 X ○ 5B HB Comparative Example 1 X X 5B 1H Comparative Example 2 X X 5B 1H Comparative Example 3 X X 5B 1H Comparative Example 4 X X 5B 1H Comparative Example 5 X X 5B 1H

As can be seen from Table 1, the aliphatic hydrocarbon compounds (Examples 1 to 11) according to one embodiment of the present application have a long chain aliphatic hydrocarbon compound having a functional group (-SH or -OH) And a long chain aliphatic hydrocarbon compound is included. Thus, when the curing rate is fast and the arrangement of the aliphatic hydrocarbon compound is kept constant and includes a short chain aliphatic hydrocarbon compound (Comparative Examples 1 to 4) 5) than that of the polarizer protective film.

This is because if the length of the chain is short, it is difficult to secure reproducibility due to a large amount of evaporation during stretching, and the arrangement of the aliphatic hydrocarbon compound is not suitable for the improvement of the cracking due to the easy arrangement of the aliphatic hydrocarbon compound. Particularly, in the case of the aliphatic hydrocarbon compounds (Examples 1 to 11) according to one embodiment of the present application, in the case of the cyclic aliphatic hydrocarbon compounds having the functional group (-SH or -OH) in the particle arrangement side (Comparative Examples 4 and 5) And the smaller the side chain, the more favorable the improvement of the fracture characteristics.

Also, as in Example 11, when the content of the long chain aliphatic hydrocarbon compound having a functional group is high, the crosslinking density is low and the film strength is decreased, and the shatterability of the coating is deteriorated as compared with the polarizer protective films of Examples 1 to 10, It was found that there was no change in the shatter characteristics of the plate, and this shows a better effect than the polarizer protective films of Comparative Examples 1 to 5.

10: Upper polarizer
20: liquid crystal cell
30: Lower polarizer plate
34: polarizer protective film
40: Backlight unit

Claims (17)

A base film; And
A polarizer protective film comprising a coating layer provided on one side or both sides of the base film,
Wherein the coating layer comprises a cationically curable resin; At least one aliphatic hydrocarbon compound selected from the group consisting of C ₁₂ to C ₃₀ aliphatic hydrocarbon compounds having -OH and C ₁₅ to C ₃₀ aliphatic hydrocarbon compounds having -SH; And a cationic initiator, or a cured product thereof. The method according to claim 1,
Wherein the cationically curable resin comprises an epoxy compound or an oxetane compound. 3. The method of claim 2,
Wherein the weight average molecular weight of the epoxy compound is 100 to 5,000 g / mol. 3. The method of claim 2,
Wherein the epoxy compound is an alicyclic epoxy compound. The method according to claim 1,
On the basis of 100 parts by weight of the coating composition,
55 to 95 parts by weight of the cationically curable resin;
0.3 to 40 parts by weight of the aliphatic hydrocarbon compound; And
And 0.05 to 10 parts by weight of the cationic initiator. The method according to claim 1,
Wherein the cationic initiator comprises a sulfonium salt or an iodonium salt. The method according to claim 1,
Wherein the thickness of the coating layer is 100 nm or more and 10 占 퐉 or less. Cationic curable resins;
At least one aliphatic hydrocarbon compound selected from the group consisting of C ₁₂ to C ₃₀ aliphatic hydrocarbon compounds having -OH and C ₁₅ to C ₃₀ aliphatic hydrocarbon compounds having -SH; And
Cationic initiators;
&Lt; / RTI &gt; 9. The method of claim 8,
Wherein the cationically curable resin comprises an alicyclic epoxy compound or an oxetane-based compound having a weight average molecular weight of 100 to 5,000 g / mol. 9. The method of claim 8,
On the basis of 100 parts by weight of the coating composition,
55 to 95 parts by weight of the cationically curable resin;
0.3 to 40 parts by weight of the aliphatic hydrocarbon compound; And
0.1 to 10 parts by weight of said cationic initiator. 9. The method of claim 8,
Wherein the cationic initiator comprises a sulfonium salt or an iodonium salt. Applying the coating composition of any one of claims 8 to 11 on at least one side of the substrate film; And
And stretching and curing the base film to which the coating composition is applied. 13. The method of claim 12,
Wherein the stretching ratio in stretching and curing the base film is 1.05 to 10 times the length in the stretching direction. 13. The method of claim 12,
Further comprising the step of stretching the base film before the step of applying the coating composition on one side of the base film. A polarizer; And
And a polarizer protective film according to any one of claims 1 to 7 on at least one surface of the polarizer. A liquid crystal cell;
An upper polarizer provided on an upper portion of the liquid crystal cell;
A lower polarizer disposed on a lower portion of the liquid crystal cell; And
And a backlight unit provided on a lower portion of the lower polarizer plate,
Wherein the lower polarizer comprises a polarizer; And a polarizer protective film according to any one of claims 1 to 7 disposed on one side or both sides of the polarizer. 17. The method of claim 16,
And the polarizer protective film is disposed to face the backlight unit.

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