KR20190084788A - Coating composition, polarizer protecting film comprizing the same and liquid crystal display device comprizing the same - Google Patents

Abstract

The present invention relates to a base film; And a coating layer provided on at least one surface of the base film, wherein the coating layer comprises a first compound and a second compound including a unit represented by the general formula (1), a polarizing plate comprising the polarizing plate, And a liquid crystal display device.

Description

TECHNICAL FIELD [0001] The present invention relates to a coating composition, a polarizer protective film comprising the same, and a liquid crystal display device including the same. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a coating composition, a polarizer protective film, a polarizing plate including the polarizing plate, and a liquid crystal display including the polarizing plate. More particularly, the present invention relates to a polarizer protective film capable of exhibiting excellent physical and optical characteristics, .

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.

In accordance with this necessity, development of a polarizer protective film which can reduce the cost of the process, and which can prevent damage to the lower polarizer while maintaining price competitiveness is required.

Korean Laid-Open Publication No. 2012-0107256

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

In order to solve the above-mentioned problems, the present invention provides a substrate film comprising: a base film; And a coating layer provided on at least one surface of the base film, wherein the coating layer comprises a first compound and a second compound including a unit represented by the following formula (1).

[Chemical Formula 1]

In Formula 1,

R ₁ is a linear or branched alkyl group containing an alicyclic epoxy group,

R ₂ to R ₄ are the same or different and each independently represents a substituted or unsubstituted straight or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group or a substituted or unsubstituted aryl group Lt;

m and n are each an integer of 1 to 20;

The present invention also provides a coating composition comprising a first compound and a second compound comprising a unit represented by the following formula (1).

[Chemical Formula 1]

In Formula 1,

R ₁ is a linear or branched alkyl group containing an alicyclic epoxy group,

R ₂ and R ₃ are the same or different and each independently represents a substituted or unsubstituted straight or branched chain alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group or a substituted or unsubstituted aryl group Lt;

R ₄ is a substituted or unsubstituted straight or branched chain alkyl group, R ₄ is an epoxy group containing at least one epoxy group,

m and n are each an integer of 1 to 20;

The present invention also relates to a method of manufacturing a substrate, comprising: applying the above-described coating composition on at least one side of a substrate film; And stretching and thermosetting the base film to which the coating composition is applied; Or stretching and then photocuring the polarizer protective film.

In addition to this, the present invention also provides a polarizer comprising: a polarizer; And a polarizer protective film described above on at least one side of the polarizer.

Finally, the present invention relates to 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 the lower polarizer and the lower layer, wherein the lower polarizer comprises a polarizer; And a polarizer protective film disposed on one side or both sides of the polarizer.

Since the polarizer protective film of the present invention is excellent in scratch resistance, scratches which may occur due to sagging phenomenon of the lower polarizer when applied to the lower polarizer can be prevented.

Also, since the coating composition of the present invention contains the first compound and the second compound containing the unit represented by the formula (1), the coating composition is excellent in adhesion to a base material, has a high surface hardness, Which is suitable for application to in-line coatings.

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 layer portion of a liquid crystal cell in a liquid crystal display device according to an exemplary embodiment of the present invention, And a coating layer, wherein the coating layer contains the first compound and the second compound including a unit represented by the following formula (1), whereby a polarizer protective film having high adhesion to the substrate and high surface hardness and excellent scratch resistance can be obtained have.

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 polarizing plate including the same, and the liquid crystal display including the same will be described in detail.

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 .

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 of the present invention exhibits excellent physical properties such as scratch resistance and hardness due to the coating layer, thereby effectively protecting the lower polarizer, and is applicable to a polarizing plate for a liquid crystal display device which is becoming thinner and larger.

A polarizer protective film according to an embodiment of the present invention includes a base film; And a coating layer formed on at least one surface of the base film.

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.

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.

According to one embodiment of the present invention, the base film may be coated with a coating composition comprising a first compound containing a unit represented by the formula (1) on one surface thereof in an unstretched state.

In another embodiment, the base film may be subjected to stretching before applying the coating composition comprising the first compound comprising a unit represented by the following formula (1).

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.

According to an embodiment of the present invention, the polarizer protective film of the present invention may be a unstretched or uniaxially or biaxially stretched base film; And a coating layer formed on at least one surface of the base film, wherein the coating layer comprises a first compound and a second compound including a unit represented by the following formula (1). The first compound containing a unit represented by the following general formula (1) can be polymerized by a reaction such as sol-gel polymerization of two or more siloxane-based compounds, and corresponds to a random copolymer.

[Chemical Formula 1]

In Formula 1,

R ₁ is a linear or branched alkyl group containing an alicyclic epoxy group,

R ₂ to R ₄ are the same or different and each independently represents a substituted or unsubstituted straight or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group or a substituted or unsubstituted aryl group Lt;

m and n are each an integer of 1 to 20;

In one embodiment of the present invention, R ₁ is a linear or branched alkyl group containing an alicyclic epoxy group, and the alkyl group may have 1 to 10 carbon atoms.

In another embodiment, the alicyclic epoxy group of R < ₁ > is a cycloalkyl group having 3 to 6 carbon atoms and having an epoxy group. Specifically, the alicyclic epoxy group may be a 3,4-epoxycyclohexyl group.

The R ₁ may be a 3,4-epoxycyclohexylethyl group.

In one embodiment of the present invention, R ₂ and R ₃ are the same or different and each independently represents a substituted or unsubstituted, linear or branched alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted C3- A substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, or a substituted or unsubstituted alkyl group having 6 to 30 carbon atoms.

According to another embodiment, R ₂ and R ₃ are the same or different and each independently represents a substituted or unsubstituted, linear or branched alkoxy group having 1 to 10 carbon atoms.

According to another embodiment, R ₂ and R ₃ are the same or different and each independently is a methoxy group, an ethoxy group or a propoxy group.

According to an embodiment of the present invention, R ₄ is a substituted or unsubstituted straight or branched alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 carbon atoms, a substituted or unsubstituted carbon number 1 To 20 carbon atoms, or a substituted or unsubstituted alkyl group having 6 to 30 carbon atoms.

According to another embodiment, R ₄ is a substituted or unsubstituted, linear or branched alkoxy group having 1 to 10 carbon atoms.

In another embodiment, R < ₄ > is a methoxy group, an ethoxy group or a propoxy group.

According to an embodiment of the present invention, R ₄ is a substituted or unsubstituted straight-chain or branched alkyl group, and R ₄ comprises at least one epoxy group.

According to another embodiment, R ₄ is a straight or branched alkyl group of 1 to 10 carbon atoms substituted with a substituted or unsubstituted alkoxy group and contains at least one epoxy group.

In another embodiment, R ₄ is a straight or branched alkyl group of 1 to 10 carbon atoms substituted with a methoxy group substituted with an epoxy group. More specifically, a propoxy group substituted with a methoxy group substituted with an epoxy group.

According to an embodiment of the present invention, the formula (1) may be represented by the following formula (1-1).

[Formula 1-1]

In Formula 1-1,

R ₁ to R ₃ , m and n are as defined in the above formula (1)

R ₅ is a substituted or unsubstituted, linear or branched alkyl group having 1 to 6 carbon atoms, and includes at least one epoxy group.

According to one embodiment of the present invention, R ₅ is an epoxy methyl group.

The terminal group of the unit represented by the formula (1) may be hydrogen, a hydroxyl group (-OH) or a substituted or unsubstituted alkyl group, and specifically includes hydrogen, a hydroxyl group (-OH) .

The weight average molecular weight of the first compound is 500 to 5,000 g / mol. If the weight average molecular weight of the first compound is too high, the viscosity may be too high to provide good coatability. If the weight average molecular weight is too small, unreacted monomers may be increased, and the unreacted monomers may be volatilized in a high- There is a problem that it does not meet the value.

The coating layer of the present invention includes a first compound and a second compound, and the second compound may be at least one selected from the group consisting of an epoxy compound, a polyol, and a plasticizer. According to one example, the second compound is an epoxy compound or a plasticizer, and the weight ratio of the first compound and the epoxy compound or plasticizer (first compound: epoxy compound or plasticizer) is 70:30 to 99: 1. According to one embodiment, the weight ratio of the first compound and the epoxy compound or plasticizer (first compound: epoxy compound or plasticizer) may be 70:30 to 90:10. When the above-mentioned content range is satisfied, there is an advantage that an in-line coating process has an appropriate stretchability and excellent scratch resistance.

According to another embodiment, the second compound is a polyol, and the weight ratio of the first compound and the polyol (first compound: polyol) is 80:20 to 99: 1. According to one embodiment, the weight ratio of the first compound and the polyol (first compound: polyol) may be 80:20 to 90:10. When the above-mentioned content range is satisfied, there is an advantage that an in-line coating process has an appropriate stretchability and excellent scratch resistance.

According to one embodiment of the present invention, the second compound is at least one selected from the group consisting of an epoxy compound, a polyol, and a plasticizer.

The epoxy compound is a binder containing at least one epoxy group and initiated to be cured by a cation. Examples of the binder include an aromatic epoxy compound, a hydrogenated epoxy compound, an alicyclic epoxy compound, and an aliphatic epoxy compound. An alicyclic epoxy compound may be preferably used. Commercial products such as Syna-Epoxy 28 and S-186 from Synasia are available.

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) (2,3-epoxy) cyclopentylphenyl-2,3-epoxypropyl ether, 1- (2,3-epoxypropoxy) phenyl-5,6- (2,3-epoxy) cyclopentylphenyl-2,3-epoxypropyl ether), 1,2-bis [5- (1,2-epoxy) -4 Ethanocyclopentenyl phenyl glycidyl ether, methylene bis (3,4-epoxycyclohexane) ethylene glycol di (3,4-epoxycyclohexylmethyl) ether, ethylene bis (3, Epoxycyclohexanecarboxylate), ε-caprolactone (1 to 10 mol) adduct of 3,4-epoxycyclohexanemethanol and poly (3 to 20) alcohol (GR, TMP, PE, DPE, Hexapentaerythritol), and the like. Among them, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate is particularly preferably used from the viewpoint of reactivity.

On the other hand, the polyol is not particularly limited as long as it has two or more hydroxyl groups in the molecule, and any suitable polyol may be employed. Examples of the polyol include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, Hexanediol, 1,8-octanediol, 1,10-decanediol, 4,4'-dihydroxyphenylpropane, 4,4'-dihydroxymethylmethane, diethylene glycol, triethylene glycol, polyethylene glycol PEG), dipropylene glycol, polytetramethylene glycol (PTMG), polypropylene glycol (PPG), polycarbonate diol, polycarbonate triol, polycarbonate tetraol, 1,4-cyclohexanedimethanol, At least one member selected from the group consisting of cyclohexanediol, bisphenol A, bisphenol F, glycerin, 1,1,1-trimethylol propane, 1,2,5-hexatriol, pentaerythritol, glucose, sucrose, It is desirable to be species.

The plasticizer includes a sulfonate plasticizer, a phosphate ester plasticizer, a sulfonamide plasticizer, a glycerin triester plasticizer, a phthalate-containing plasticizer and the like. Specifically, DOP (PHTHALIC ACID DI-2 ETHYL-HEXYL), DIDP (PHTHALIC ACID DI-ISO DECYL), DINP (PHTHALIC ACID DI-ISO NONYL), DBP (PHTHALIC ACID DI-BUTYL) ETHYL HEXYL), and the like, but not limited thereto, and any type known in the art that can be used with an epoxy group can be used.

In one embodiment of the present invention, the coating layer further comprises a silicon-based compound or a fluorine-based compound. By further including a silicone compound or a fluorine compound, the anti-blocking property and the slip property of the protective film are improved.

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 an embodiment of the present invention, the silicone compound or the fluorine compound may be 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 coating layer comprises an initiator, and the initiator may be a cationic photoinitiator or a cationic initiator.

The cationic photoinitiator is a compound that produces a cationic species or Lewis acid by irradiation with active energy rays such as ultraviolet rays, and means a compound that acts on a cationic polymerizable group such as an epoxy group to initiate cationic polymerization reaction.

As the cationic photoinitiator, cationic photoinitiators commonly used in the art can be used without limitation. For example, the cationic photoinitiator may preferably include a sulfonium salt or an iodonium salt.

Specific examples of the cationic polymerization initiator including a sulfonium salt or an iodonium salt include diphenyl (4-phenylthio) phenylsulfonium hexafluoroantimonate (Diphenyl (4- phenylthio) phenylsulfonium hexafluoroantimonate), diphenyl (4-phenylthio) phenylsulfonium hexafluorophosphate, phenyl (4- (2-methylpropyl) phenyl] -iodonium hexa (2-methylpropyl) phenyl] -iodonium hexafluorophosphate, (thiodi-4,1-phenylene) bis (diphenylsulfonium) dihexafluoroantimonate ((Thiodi- 4,1-phenylene) bis (diphenylsulfonium) dihexafluoroantimonate and thiodi-4,1-phenylene bis (diphenylsulfonium) bis (diphenylsulfonium) dihexafluoroantimonate) dihexafluorophosphate), but is limited to at least one selected from the group consisting of No.

It is preferable that the cationic thermal initiator has a starting temperature at the time of decomposition of 60 ° C or more and 150 ° C or less.

The cationic thermal initiator means a compound that produces a cation or a Lewis acid by heat treatment and acts on a cationic polymerizable group such as an epoxy group to initiate a cationic polymerization reaction.

At this time, the cationic thermal initiators generally used in the art can be used without limitation when the cationic thermal decomposition occurs. For example, a sulfonium salt, an ammonium salt, a phosphonium salt, an onium salt, an iodonium salt, and the like. Specific examples thereof include ammonium / antimony hexafluoride, triarylsulfonium hexafluoroantimonate salts, trianylsulfonium hexafluoroantimonate, (Tolylumil) iodonium tetrakis (pentafluorophenyl) borate, Bis (dodecylphenyl) iodonium hexafluoroantimonate, iodonium (4-methylphenyl) (4- (2-methylpropyl) phenyl) hexafluorophosphate, octyldiphenyliodonium hexafluoroantimonate Benzylpyridinium salts, N-benzylpyridinium salts, N-benzylammonium salts, phosphonium salts, hydrazinium salts, ammonium borate salts, triaryl iodonium salts, benzylsulfonium salts, phenacylsulfonium salts, Phenylmethyl chloride, and mixtures thereof. Preferred examples thereof include ammonium / antimony hexafluoride, trianylsulfonium hexafluoroantimonate, triphenylmethyl chloride, and the like. Products in the mountains - can be used such aid (San Aid) SI-B3, SI-360.

The content of the cation photoinitiator and the cationic thermal initiator may be 0.1 to 10 parts by weight, preferably 0.1 to 5 parts by weight based on 100 parts by weight of the first compound solid.

Meanwhile, according to one embodiment of the present invention, the coating layer may further include fine particles for imparting hardness improvement, anti-blocking property and slipperiness. The fine particles may be at least one selected from the group consisting of organic fine particles and inorganic fine particles. 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 of a protective film.

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 solids of the coating composition forming the coating layer. 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 coating 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 layer of the present invention may contain additives other than the above-mentioned components, such as surfactants, antioxidants, UV stabilizers, leveling agents, antifouling agents, antistatic agents, UV absorbers, antifoaming agents, preservatives, . ≪ / RTI > The content is not particularly limited as it can be varied within a range that does not deteriorate the physical properties of the coating composition of the present invention. For example, about 100 parts by weight based on the solid content of the coating composition for forming the coating layer, about 0.1 to about 10 parts by weight.

The coating layer of the present invention comprises a first compound containing a unit represented by the general formula (1) described above; And a second compound. The coating composition 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. 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 total coating composition. According to one example, the organic solvent may be included in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the total coating composition.

Examples of the organic solvent 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 , Ether solvents such as diethylene glycol monomethyl ether, diethyl glycol monoethyl ether, diethyl glycol monopropyl ether, diethyl glycol monobutyl ether and diethylene glycol-2-ethylhexyl ether, benzene, toluene, xylene And the like can be used alone or in combination.

According to one embodiment of the present invention, there is provided a coating composition comprising a first compound and a second compound comprising a unit represented by the following general formula (1).

[Chemical Formula 1]

In Formula 1,

R ₁ is a linear or branched alkyl group containing an alicyclic epoxy group,

R ₂ to R ₄ are the same or different and each independently represents a substituted or unsubstituted straight or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group or a substituted or unsubstituted aryl group Lt;

m and n are each an integer of 1 to 20;

The terminal group of the unit represented by the formula (1) may be hydrogen, a hydroxyl group (-OH) or a substituted or unsubstituted alkyl group, and specifically includes hydrogen, a hydroxyl group (-OH) .

The weight average molecular weight of the first compound is 500 to 5,000 g / mol. If the weight average molecular weight of the first compound is too high, the viscosity may be too high to provide good coatability. If the weight average molecular weight is too small, unreacted monomers may be increased, and the unreacted monomers may be volatilized in a high- There is a problem that it does not meet the value.

The definition of the substituent in the above formula (1) is as described above.

The second compound is at least one selected from the group consisting of an epoxy compound, a polyol, and a plasticizer, and the specific kinds and contents thereof are as described above.

The coating composition may further contain an initiator, and the initiator may be a cationic photoinitiator or a cationic initiator, and the types and contents of the cationic photoinitiator and the cationic thermal initiator are as described above.

The coating composition may further include at least one member selected from the group consisting of a silicone compound, a fluorine compound, and a fine particle, and the specific types and contents of the silicone compound, the fluorine compound and the fine particles are as described above.

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. 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 total coating composition. According to one example, the organic solvent may be included in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the total coating composition. The organic solvent contained in the coating composition is as described above.

According to one embodiment of the present invention, there is provided a method for producing a polarizer protective film comprising applying the above-mentioned coating composition on at least one surface of the base film.

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

A coating composition comprising a first compound and a second compound is coated on at least one side of the substrate film, and the coating composition is cured by heat treatment and / or UV irradiation.

The substrate film coated with the coating composition containing the first compound and the second compound may be cured by UV irradiation after the heat treatment.

According to one embodiment of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: applying the above-mentioned coating composition on at least one side of the base film; And stretching and thermosetting the base film to which the coating composition is applied; Or stretching and then photocuring the polarizer protective film.

In this case, the stretching direction is not particularly limited, and may be stretched in the width direction (TD) or the length (MD) direction, and may be uniaxially or biaxially stretched. The stretching ratio may be 1.05 to 10 times, or 1.2 to 10 times, 1.5 to 5 times, or 1.5 to 3 times, based on the length in the stretching direction. If the stretching ratio is less than 1.05 times, the effect of stretching may not be sufficiently achieved, and when the stretching ratio is more than 10 times, the coating layer may be cracked.

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.

In the step of stretching and thermosetting the base film coated with the coating composition, the stretching and thermosetting (heat treatment) temperature is not lower than 80 캜. Specifically, it is not lower than 80 ° C but not higher than 250 ° C. More specifically, it is 80 DEG C or more and 150 DEG C or less.

The heat curing (heat treatment) time in the step of stretching and thermosetting the base film coated with the coating composition may be from 1 minute to 30 minutes. Specifically, it may be from 1 minute to 20 minutes, more specifically from 1 minute to 10 minutes. When the heat curing (heat treatment) time satisfies the above range, the curing reaction by the thermal initiator sufficiently occurs, and a film having the desired film strength can be obtained.

The method may further include the step of subjecting the coating composition to photo-curing or heat-treating after stretching and thermosetting the applied substrate film.

In the case of performing the heat treatment after the stretching and thermosetting, the heat treatment temperature and time are the same as the stretching and thermosetting (heat treatment) temperature and time in the step of stretching and thermosetting the base film coated with the coating composition.

Since the stretched coating layer is formed integrally with the stretched base film, it is advantageous to provide a polarizer protective film having a thin coating layer having high adhesion to a base film and uniform thickness even without a separate primer layer.

The ultraviolet irradiation amount of the photocuring 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.

According to one embodiment of the present invention, the final thickness of the coating layer after drying, stretching and curing may be 50 nm to 10 탆, specifically 100 nm to 10 탆. And more specifically 500 nm to 5 탆. As described above, the coating layer of the present invention can be produced 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.

The coating layer may be formed on only one side of the stretched substrate 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 stretched coating layer.

As such, when the polarizer protective film of the present invention includes another layer, film or film or the like on the other surface of the 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 obtained by the production method of the present invention as described above is obtained by connecting a sample to a vibration generator and superimposing the sample and the diffusion sheet in contact with each other, applying a vibration for a predetermined time under a load, The scratch resistance 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.

A polarizer protective film obtained by the above-mentioned production method can be laminated on at least one surface of a polarizer, and a polarizing plate including the polarizer protective film can be provided.

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.

The polarizer according to the present invention may further include an adhesive layer on one side or both sides of the polarizer for attachment of the polarizer and the optical film. For example, the polarizer of the present specification may be a polarizer, The structure may be [coating layer / base film / adhesive layer / polarizer], but is not limited thereto. At this time, the adhesive that can be used in forming the adhesive layer is preferably a water-based or non-aqueous adhesive commonly used in the art.

Examples of the water-based adhesives include polyvinyl alcohol-based adhesives, acrylic adhesives, epoxy-based adhesives, and urethane-based adhesives. Among them, a polyvinyl alcohol-based adhesive is preferable, and a modified polyvinyl alcohol adhesive containing an acetoacetyl group and the like is particularly preferable in view of the adhesive force with a polarizer and the like. Specific examples of the polyvinyl alcohol-based adhesive include, but are not limited to, Japanese synthetic chemicals Gohsefiner Z-100, Z-200, Z-200H, Z-210, Z-220 and Z-320.

The adhesion of the polarizer to the optical film using the water-based adhesive may be performed by first coating an adhesive on the surface of the optical film or the PVA film as a polarizer using a roll coater, a gravure coater, a bar coater, a knife coater or a capillary coater And the protective film and the polarizing film are thermally pressed or compressed at room temperature by a ply roll before the adhesive is completely dried. When a hot-melt type adhesive is used, a hot press roll is used.

On the other hand, the non-aqueous adhesive is preferably an ultraviolet curing type and is not particularly limited. For example, an adhesive using a photo radical polymerization reaction such as a (meth) acrylate adhesive, an ene / thiol adhesive or an unsaturated polyester adhesive And an adhesive using a photo cationic polymerization reaction such as an epoxy adhesive, an oxetane adhesive, an epoxy / oxetane adhesive, and a vinyl ether adhesive. The adhesion of the polarizer to the optical film using the non-aqueous adhesive is performed by applying an adhesive composition to form an adhesive layer, then laminating the polarizer and the optical film, and curing the adhesive composition through light irradiation.

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

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 an embodiment of the present invention, the liquid crystal display comprises 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 the above-described polarizer protective film disposed on one side or both sides of the polarizer.

The polarizing plate including the polarizer protective film of the present invention can be provided as a lower polarizing plate of a liquid crystal display device.

In addition, the polarizing plate including the polarizer protective film of the present invention may be a lower polarizing plate of a liquid crystal display, and the polarizing plate protective film of the present invention may be disposed to face the backlighting unit.

As described above, when the polarizer protective film is laminated on the LCD and the polarizer is stacked on the LCD, the lower protective film of the polarizer is damaged by abutting against the backlight unit provided under the polarizer, thereby exhibiting excellent optical properties.

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.

The polarizing plate having the protective film of the present invention is applied to an LCD, but the present invention is not limited thereto and can be applied to 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.

1 is a diagram showing a liquid crystal display device including a polarizer protective film 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.

< Manufacturing example >

Epoxy- Silane  Preparation of copolymer A

2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane (Momentive, Silquest A-186) and 3- glycidoxypropyltrimethoxysilane [3 (4-epoxycyclohexyl) ethyltrimethoxysilane -Glycidoxypropyltrimethoxysilane (Momentive, Silquest A-187) was subjected to a sol-gel condensation reaction with a small amount of water at a weight ratio of 2: 1 to obtain a polymer having a number average molecular weight (Mn) of 1170 and a weight average molecular weight (Mw ) &Lt; / RTI &gt; of 2480 was obtained. &Lt; tb &gt; &lt; TABLE &gt;

Polarizer  Manufacture of protective film

Example  One.

A non-extensible acrylic film having a width of 800 mm was prepared using a poly (cyclohexylmaleimide-co-methylmethacrylate) (LMMA PMMA830HR) resin at 250 DEG C and 250 rpm using a T- And stretched 1.8 times in the MD direction at the temperature.

 2.0 g of bifunctional epoxy monomer (Synasia Inc. Syna-Epoxy 28, solid content: 100 wt%), 20 g of a cationic UV initiator (San-Apro Ltd. CPI-100P: solid content 50 wt%), Were mixed to prepare a coating solution. Thereafter, the coating solution prepared above was coated on a Mayer bar on the acrylic film stretched in the MD direction, and then stretched 2.5 times in the TD direction for 1 minute at a temperature of 130 DEG C, followed by UV curing to form a scratch- To thereby produce an acrylic film.

Example  2.

When preparing coating liquid A film was prepared in the same manner as in Example 1, except that 14.0 g of epoxy-silane copolymer A and 6.0 g of bifunctional epoxy monomer (Synasia Inc. Syna-Epoxy 28: solid content 100 wt%) were used.

Example  3.

When preparing coating liquid A film was prepared in the same manner as in Example 1 except that 18.0 g of epoxy-silane copolymer A and 2.0 g of trifunctional epoxy monomer (Synasia Inc. S-186: solid content 100 wt%) were used.

Example  4.

When preparing coating liquid A film was prepared in the same manner as in Example 1, except that 14.0 g of epoxy-silane copolymer A and 6.0 g of trifunctional epoxy monomer (Synasia Inc. S-186: solid content 100 wt%) were used.

Example  5.

When preparing coating liquid A film was prepared in the same manner as in Example 1 except that 18.0 g of the epoxy-silane copolymer A and 2.0 g of a polyol (Asahi KASEI DURANOL T5651: solid content 100 wt%) were used.

Example  6.

When preparing coating liquid A film was prepared in the same manner as in Example 1 except that 16.0 g of the epoxy-silane copolymer A and 4.0 g of a polyol (Asahi KASEI DURANOL T5651: solid content 100 wt%) were used.

Comparative Example  One.

When preparing coating liquid A film was prepared in the same manner as in Example 1 except that the bifunctional epoxy monomer was not contained and 20.0 g of the epoxy-silane copolymer A was contained.

Comparative Example  2.

When preparing coating liquid A film was prepared in the same manner as in Example 1, except that the epoxy-silane copolymer A (12.0 g) and bifunctional epoxy monomer (Synasia Inc. Syna-Epoxy 28: solid content 100 wt%) were changed to 8.0 g.

Comparative Example  3.

When preparing coating liquid A film was prepared in the same manner as in Example 1, except that 12.0 g of the epoxy-silane copolymer A and 8.0 g of a trifunctional epoxy monomer (Synasia Inc. S-186: solid content 100 wt%) were used.

Comparative Example  4.

When preparing coating liquid A film was prepared in the same manner as in Example 1, except that 14.0 g of epoxy-silane copolymer A and 6.0 g of polyol (Asahi KASEI DURANOL T5651: solid content 100 wt%) were used.

Comparative Example  5.

A film was prepared in the same manner as in Example 1, except that the coating was not performed.

< Experimental Example  >

<Measurement method>

Physical properties of the polarizer protective films of Examples and Comparative Examples were measured by the following methods.

1) scratch resistance

The coating layer of the polarizer protective film of the examples and comparative examples and the diffusion sheet (LG Electronics Inc., ND146) were put in contact with each other in a sample folder (50 mm x 50 mm) to which the vibration generator was connected, Vibration (applied vibration intensity 2.8 Grams, frequency 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. ? Indicates no scratch or cracking;? Indicates fine scratch or cracking; and X indicates scratching.

2) Coating appearance

After coating the coating liquid on the acrylic base material, there should be no basic coating defects such as dewetting marks, bubble marks, and bar marks, and 5 points in the width direction of the cured films were measured with a haze meter (HM-150 / MURAKAMI), the haze (Haze) measured using standard JIS K 7136 was 0.4% or less, the appearance of coating was good only when the difference between the maximum value and the minimum value was 0.2% or less, If any one of them is not satisfied, it is evaluated as bad (X).

3) Extensibility

When the coating liquid is applied to the acrylic base material, it is evaluated that when the film is stretched uniformly at 130 ° C in the TD direction, the film is uniformly stretched without damage to the coating layer and the coating layer is cracked and the film is judged as defective (X). The coating layer cracks are observed with an optical microscope and refer to a case where the major axis length is 1 μm or more.

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

Base film Coating composition Scratch resistance Coating Appearance Extensibility Example 1 acryl Coating composition 1 ○ ○ ○ Example 2 acryl Coating composition 2 ○ ○ ○ Example 3 acryl Coating composition 3 ○ ○ ○ Example 4 acryl Coating composition 4 ○ ○ ○ Example 5 acryl Coating composition 5 ○ ○ ○ Example 6 acryl Coating composition 6 ○ ○ ○ Comparative Example 1 acryl Comparative Coating Composition 1 △ X X Comparative Example 2 acryl Comparative Coating Composition 2 X ○ ○ Comparative Example 3 acryl Comparative coating composition 3 X ○ ○ Comparative Example 4 acryl Comparative Coating Composition 4 X ○ ○ Comparative Example 5 acryl Not coated X - ○

From the above Table 1, it can be seen that Examples 1 to 6 are excellent in coating appearance, stretchability and scratch resistance, but the polarizer protective film of Comparative Example 1 which does not contain the second compound has poor scratch resistance, I have confirmed that the divinity is very low.

Comparative Examples 2 and 3 in which the weight ratio of the epoxy-silane copolymer A as the first compound and the epoxy monomer as the second compound (the first compound: epoxy compound) was out of the range of 70:30 to 99: 1, Comparative Example 4 in which the weight ratio of the epoxy-silane copolymer A as the first compound and the polyol as the second compound (first compound: polyol) was out of the range of 80:20 to 99: 1, and Comparative Example 4 in which the coating layer was not formed 5 showed very low scratch resistance.

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

Claims (18)

A base film; And a coating layer provided on at least one side of the base film,
Wherein the coating layer comprises a first compound comprising a unit represented by the following formula (1) and a second compound.
[Chemical Formula 1]

In Formula 1,
R ₁ is a linear or branched alkyl group containing an alicyclic epoxy group,
R ₂ to R ₄ are the same or different and each independently represents a substituted or unsubstituted straight or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group or a substituted or unsubstituted aryl group Lt;
m and n are each an integer of 1 to 20; The method according to claim 1,
Wherein R &lt; ₄ &gt; is a substituted or unsubstituted linear or branched alkyl group, and R &lt; ₄ &gt; includes at least one epoxy group. The method according to claim 1,
Wherein the first compound has a weight average molecular weight of 500 to 5,000 g / mol. The method according to claim 1,
Wherein the second compound is an epoxy compound or plasticizer,
Wherein the weight ratio of the first compound and the epoxy compound or plasticizer (first compound: epoxy compound or plasticizer) is 70:30 to 99: 1. The method according to claim 1,
Wherein the second compound is a polyol,
Wherein the weight ratio of the first compound to the polyol (first compound: polyol) is 80:20 to 99: 1. The method according to claim 1,
Wherein the coating layer further comprises an initiator. The method according to claim 1,
Wherein the coating layer further comprises at least one selected from the group consisting of a silicone compound, a fluorine compound, and a fine particle. 1. A coating composition comprising a first compound comprising a unit represented by the following formula (1) and a second compound.
[Chemical Formula 1]

In Formula 1,
R ₁ is a linear or branched alkyl group containing an alicyclic epoxy group,
R ₂ to R ₄ are the same or different and each independently represents a substituted or unsubstituted straight or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group or a substituted or unsubstituted aryl group Lt;
m and n are each an integer of 1 to 20; 9. The method of claim 8,
Wherein R &lt; ₄ &gt; is a substituted or unsubstituted, linear or branched alkyl group, and R &lt; ₄ &gt; includes at least one epoxy group. In the eighth aspect,
Wherein the second compound is an epoxy compound or plasticizer,
Wherein the weight ratio of the first compound and the epoxy compound or plasticizer (first compound: epoxy compound or plasticizer) is 70:30 to 99: 1. 9. The method of claim 8,
Wherein the second compound is a polyol,
Wherein the weight ratio of the first compound and the polyol (first compound: polyol) is 80:20 to 99: 1. 9. The method of claim 8,
Wherein the coating composition further comprises an initiator. 9. The method of claim 8,
Wherein the coating composition further comprises at least one selected from the group consisting of a silicon-based compound, a fluorine-based compound, and a fine particle. Applying the coating composition of any one of claims 8 to 13 on at least one side of the substrate film. 15. The method of claim 14,
After the step of applying the coating composition,
Stretching and thermosetting the substrate film coated with the coating composition; Or stretching and then photocuring the polarizer protective film. A polarizer; And
A polarizer comprising a polarizer protective film according to any one of claims 1 to 7 on at least one side 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. 18. The method of claim 17,
Wherein the polarizer protective film is disposed to face the backlight unit.

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