KR101922292B1 - Polarizing film and display including the same - Google Patents

Abstract

The invention provides a polarizing film and a display device including the polarizing film. Wherein the polarizing film comprises a polarizer having a thickness of 5 to 20 占 퐉, a thiol group, and a thickness of 25 占 퐉 to 40 占 퐉, a first polarizer protective film disposed on one surface of the polarizer, And a first adhesive layer disposed between the polarizer and the first polarizer protective film.

Description

TECHNICAL FIELD [0001] The present invention relates to a polarizing film and a display device including the polarizing film.

The present invention relates to a polarizing film and a display device including the polarizing film.

The polarizing film generally comprises a polarizer having a polarizing function and a polarizer protective film laminated on one surface or both surfaces of the polarizer to protect the polarizer. As the polarizer protective film, triacetyl cellulose (TAC) resin film was mainly used.

In recent years, due to the thinness of the polarizing film, there is an attempt to manufacture the polarizer protective film using an acrylic resin, while requiring excellent moisture permeability for the polarizer protecting film. However, since the acrylic resin is a brittle material, it is not suitable for a thin polarizing plate protective film because it tends to be broken when an external force acts.

DISCLOSURE Technical Problem The present invention aims to provide a thin polarizing film having improved moisture permeability and a display device including the polarizing film.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

A polarizing film according to an embodiment of the present invention includes a polarizer having a thickness of 5 占 퐉 to 20 占 퐉, a thiol group including a thioether group and having a thickness of 25 占 퐉 to 40 占 퐉 and disposed on one surface of the polarizer, And a first adhesive layer disposed between the polarizer and the first polarizer protective film.

A display device according to another embodiment of the present invention includes a display panel and the above polarizing film. The polarizing film may be disposed on one side or both sides of the display panel, and may be one or more.

The details of other embodiments are included in the detailed description and drawings.

Embodiments of the present invention provide a method of forming a first polarizer protective film using a polythioether resin polymerized through a thiol-ene reaction which is a step-growth reaction and having a uniform cross- Whereby excellent moisture permeability can be exhibited. This is because the polythioether resin can exhibit excellent moisture permeability in comparison with the acrylic resin and the triacetylcellulose resin at substantially the same thickness as the acrylic resin and the triacetylcellulose resin. Therefore, embodiments of the invention can provide a thin polarizing film having improved moisture permeability and a display device including the polarizing film.

The effects according to the invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a schematic cross-sectional view of a first polarizing film.
2 is a schematic cross-sectional view of the second polarizing film.
3 is a schematic cross-sectional view of the third polarizing film.
4 is a schematic sectional view of the display device.
5 is a schematic cross-sectional view of a display panel of the display device of Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art. To fully disclose the scope of the invention disclosed herein, and the invention is only defined by the scope of the claims.

It will be understood that when an element or layer is referred to as being " on " another element or layer, it encompasses all other elements or intervening layers or other elements in between. Like reference numerals refer to like elements throughout the specification.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

In the present specification, " A to B " is defined as A to B or less, and " C _AB "

Hereinafter, the present invention will be described in detail based on the accompanying drawings and experimental examples.

1 is a schematic cross-sectional view of a first polarizing film 100. Fig. Referring to Fig. 1, the first polarizing film 100 includes a polarizer 10, a first adhesive layer 20, and a first polarizer protective film 30.

The polarizer 10 may be a thin polarizer and may have a thickness of 5 占 퐉 to 20 占 퐉. The polarizer 10 may be a polyvinyl alcohol (PVA) -based film dyed with, for example, iodine or a dichroic dye, which can convert natural light or polarized light into arbitrary polarized light. At this time, the polarizer 10 can be produced by dyeing a polyvinyl alcohol (PVA) -based film with iodine or a dichroic dye and stretching it in a predetermined direction. Specifically, it can be manufactured through a swelling step, a dyeing step, and a stretching step, and each step is known to those skilled in the art, and a detailed description thereof will be omitted.

For example, the polyvinyl alcohol (PVA) film may be a modified polyvinyl alcohol film such as a non-denatured bare polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, or an acetoacetyl modified polyvinyl alcohol film . ≪ / RTI >

For example, the degree of polymerization of the polyvinyl alcohol-based film may be from 1,700 to 4,000 and may function as a polarizing substrate within the range of the degree of polymerization described above.

The first polarizer protective film 30 may serve to protect the polarizer 10. The first polarizer protective film 30 may be disposed on one side of the polarizer 10. The polyvinyl alcohol film is preferably a material having high moisture permeability. In order to improve the durability or reliability of the first polarizing film 100, it is preferable that the first polarizer protective film 30 is made of a material having high moisture resistance. Further, when the first polarizing film 100 is a thin film, since the polarizer 10 is also formed of a thin film, the first polarizing protective film 30 is made of a material that is excellent in moisture permeability and is easy to manufacture as a thin film .

The first polarizer protective film 30 includes a polythioether resin. The polythioether resin is a polymer resin containing a thioether group in the repeating unit, and can be polymerized through the thiol-ene reaction of the monomers. The thiol-ene reaction is a step-growth reaction which can provide a homogeneous crosslinking density to the photopolymerized polymer and provide a cured composition with less shrinkage after photo-curing.

Due to the uniform cross-linking density of the polythioether resin, the first polarizer protective film 30 is formed of the acrylic resin-based polarizer protective film and the triacetylcellulose resin-based polarizer protective film at substantially the same thickness as the acrylic resin- It is possible to exhibit excellent moisture permeability as compared with the triacetylcellulose resin-based polarizer protective film.

On the other hand, since the acrylic resin is a brittle material, it is not suitable for a thin polarizing plate protective film because it tends to be broken when an external force acts, while the polythioether has a uniform cross-linking density, It is more suitable for a thin film than the acrylic resin. The first polarizer protective film 30 is a thin film having a thickness of 25 탆 to 40 탆 in which the water vapor transmission rate (WVTR) at 40 캜 and 90% relative humidity is 1 g / m ² · day to about 120 g / m ² · day, or 1 g / m ² · day to about 100 g / m ² · day, or 1 g / m ² · day to about 90 g / m ² · day, or 1 g / m ² · day to 60 g / m ² · day, or 40 g / m ² · day to 50 g / m ² · day.

The monomers participating in the thiol-ene reaction may be one of thiol-based monomers represented by the following formulas (1) to (3) and vinyl-based monomers represented by the following formulas (4) to (7), but not limited thereto .

(Formula 1)

(2)

(Formula 3)

(Formula 4)

(Formula 5)

(Formula 6)

(Formula 7)

Optionally, the first polarizer protective film 30 may further comprise an ultraviolet absorber.

The first adhesive layer 20 can be disposed between the polarizer 10 and the first polarizer protective film 30 and can bond the polarizer 10 and the first polarizer protective film 30 to each other. That is, the first polarizer protective film 30 may be disposed on one side of the first adhesive layer 20, and the polarizer 10 may be disposed on the other side of the first adhesive layer 20.

The first adhesive layer 20 may be formed of a conventional adhesive, for example, an aqueous adhesive, a solventless adhesive, a pressure-sensitive adhesive, or the like. However, in order to further improve the moisture permeability of the first polarizing film 100, it is preferable that the first adhesive layer 20 is formed of the adhesive agent of the non-solvent type.

For example, the solventless adhesive may be prepared by mixing at least one of a curing component of a urethane polymer, a (meth) acrylate, a urethane, an epoxy, an epoxy (meth) acrylate, a urethane (meth) acrylate, . ≪ / RTI >

The content of the curing component may be in the range of 90 wt% or more to 99 wt% or less, and the curing agent may be in the range of 1 wt% or more and 10 wt% or less.

For example, the curable component may be a (meth) acrylate monomer having a vinyl group and the (meth) acrylate monomer having a vinyl group may be a (meth) acrylate having a C _1-15 linear or branched alkyl group (Meth) acrylate having a C _5-15 alicyclic group, (meth) acrylate having a C _6-20 aryl group, (meth) acrylate having a C _7-20 aralkyl group, or a mixture thereof And so on. More specifically, the (meth) acrylate monomer may be at least one selected from the group consisting of methyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, neo-pentyl ) Acrylate, lauryl (meth) acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate and benzyl (meth) acrylate. However, the present invention is not limited to these.

The curing agent may be a photo-curing agent or a thermosetting agent, for example, an isocyanate-based curing agent, acetophenone, benzoin, benzophenone, diethoxyacetophenone, phenyletone, thioxanthone, 2-methyl-1-phenylpropan-1-one, benzyldimethyltartarboxylate, 4- (2-hydroxyethoxy) phenyl- Ketone, methyl o-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyl-diphenyl sulfide, (4- benzoylbenzyl) trimethylammonium chloride, bis (2,4,6-trimethylbenzoyl) Phosphine oxide, diphenyl (2,4,6-trimethylbenzoyl) -phosphine oxide, 2-hydroxymethylpropionone nitrile, 2,2 '- {azobis (2-methoxy-2-phenyl-2-benzoyl) -ethyl] ester, phenyl 2-acryloyloxy-2- Propyl ketone, phenyl Acryloyloxy-2-propyl ketone, 4-isopropylphenyl 2-acryloyloxy-2-propyl ketone, 4-chlorophenyl 2- Acryloyloxyphenyl 2-hydroxy-2-propyl ketone, 4-methoxyphenyl 2-acryloyloxy-2-propyl ketone, Hydroxy-2-propyl ketone, 4- (2-acryloyloxyethoxy) -phenyl 2-hydroxy-2-propyl ketone, 4- ) -Phenyl 2-hydroxy-2-propyl ketone, 4- (2-acryloyloxyethoxy) -benzoin, 4- Hydroxy-2-propyl ketone, 4-acryloyloxyphenyl 2-acryloyloxy-2- (2-acryloyloxyethyl) Propyl ketone, 4-methacryloyloxyphenyl 2-methacryloyloxy-2-propyl ketone, Acryloyloxy-2-propyl ketone, 4- (2-acryloyloxydiethoxy) -phenyl 2-acryloyloxy-2- Ketones, dibenzyl ketones, benzoin alkyl ethers, benzoin methyl ethers, benzoin ethyl ethers, benzoin isopropyl ethers, benzoin isobutyl ethers, dialkyl acetals But are not limited to, dialkyl acetophenone, hydroxyl alkylketone, phenyl glyoxylate, benzyl dimethyl ketal, acyl phosphine, α-aminoketone, As shown in FIG. However, the present invention is not limited to these.

The first polarizing film 100 may further include an optical functional layer FL disposed on the first polarizer protective film 30. [ The thickness of the optical functional layer FL is not particularly limited, but may be 3 탆 to 7 탆. The optical function layer FL may be formed of, for example, a hard-coating layer, an anti-reflection layer, an anti-glare layer, a low reflection layer, A low-reflection layer (Anti-Glare Low Reflection Layer), and a diffusion layer.

The hard coating layer, the antireflection layer, and the anti-glare layer are specifically described among the spheres of the optical functional layer FL. The hard coating layer improves wet heat durability of the first polarizing film 100 and prevents dimensional change The anti-glare layer may reduce the reflection of light incident from the outside, and the anti-glare layer may prevent the glare by inducing diffusion and reflection of light incident from the outside.

The first polarizing film 100 may further include adhesive layers 40 and 50 and release films 60 and 70. The adhesive layer 40 may be disposed on the other side of the polarizer 10 and the adhesive layer 50 may be disposed on one side of the optical functional layer FL. The release film 60 may be disposed on the other side of the adhesive layer 40 and the adhesive layer 40 may be disposed between the polarizer 10 and the release film 60, The adhesive layer 50 may be disposed on one side of the adhesive layer 50 and the adhesive layer 50 may be disposed between the optical functional layer FL and the release film 70. [

The first polarizing film 100 may be bonded to or adhered to the display panel 200 (FIG. 4) using the adhesive layer 40, with the release film 60 removed. The release film 70 is a protective film for protecting the first polarizing film 100. When the first polarizing film 100 is bonded to or adhered to the display panel 200 Can be removed together.

2 is a schematic cross-sectional view of the second polarizing film 100-1. Referring to FIGS. 1 and 2, the second polarizing film 100-1 further includes a second polarizer protective film 30-1 and a second adhesive layer 20-1 in the first polarizing film 100. FIG. Since the other components than the second polarizer protective film 30-1 and the second adhesive layer 20-1 have been described above, a detailed description thereof will be omitted. The second polarizer protective film 30-1, And the second adhesive layer 20-1 will be briefly described below.

The second polarizer protective film 30-1 and the second adhesive layer 20-1 may be substantially the same as the first polarizer protective film 30 and the first adhesive layer 20, respectively.

The second polarizer protective film 30-1 may serve to protect the polarizer 10. The second polarizer protective film 30-1 may be disposed on the other surface of the polarizer 10. [ The second polarizer protective film 30-1 may include a polythioether resin, and may have a thickness of 25 占 퐉 to 40 占 퐉. The polythioether resin is a polymer resin containing a thioether group in the repeating unit, and can be polymerized through the thiol-ene reaction of the monomers. Due to the uniform cross-linking density of the polythioether resin, the second polarizer protective film (30-1) exhibits excellent moisture permeability at substantially the same thickness as the acrylic resin-based polarizer protective film and the triacetylcellulose resin-based polarizer protective film Can be exercised.

The second adhesive layer 20-1 may be disposed between the polarizer 10 and the second polarizer protective film 30-1 and may be disposed between the polarizer 10 and the second polarizer protective film 30-1 . That is, the second polarizer protective film 30-1 may be disposed on the other surface of the second adhesive layer 20-1, and the polarizer 10 may be disposed on one surface of the second adhesive layer 20-1.

The second adhesive layer 20-1 may be formed with a conventional adhesive, for example, an aqueous adhesive, a solventless adhesive, a pressure-sensitive adhesive, or the like. However, in order to further improve the moisture permeability of the second polarizing film 100-1, it is preferable that the second adhesive layer 20-1 is formed of the adhesive agent of the non-solvent type.

3 is a schematic cross-sectional view of the third polarizing film 100-2. Referring to FIGS. 1 and 3, the third polarizing film 100-2 further includes a coating layer 30C in the first polarizing film 100. FIG. Since other components than the coating layer 30C have been described above, a detailed description thereof will be omitted, and only the coating layer 30C will be briefly described below.

The coating layer 30C may be disposed on the other surface of the polarizer 10. [ The coating layer 30C includes a polythioether resin and may have a thickness of 5 mu m to 25 mu m. At this time, the thickness of the first polarizer protective film 30 may be thicker than the thickness of the coating layer 30C. The coating layer 30C is formed by applying a coating liquid on the other surface of the polarizer 10, and is different from the first polarizer protective film 30, which is in the form of a film itself.

4 is a schematic cross-sectional view of the display apparatus 1000. Fig. 5 is a schematic cross-sectional view of the display panel 200 of FIG.

4 and 5, the display apparatus 1000 includes a display panel 200, a backlight unit 300, a lower polarizer 120 disposed between the display panel 200 and the backlight unit 300, The upper polarizer 110 may be disposed on the viewing side of the liquid crystal display panel 200.

The display panel 200 may be a liquid crystal display panel. The display panel 200 may include a first substrate 210, a second substrate 230, a liquid crystal layer 220 sealed between the first substrate 210 and the second substrate 230, The upper polarizer 110 may be laminated on one surface (upper surface) of the substrate 210. When the lower polarizer 120 is stacked on the lower surface of the second substrate 230 and the two polarizers 110 and 120 are disposed above and below the display panel 200, They may be orthogonal or parallel to each other. The upper polarizer 110 and the lower polarizer 120 may be composed of the polarizers 100 and 100-1 of the embodiment of the present invention.

The first substrate 210 may be a color filter (CF) substrate. Although not shown in detail in FIG. 3, for example, a black matrix for preventing light leakage, a color filter of red, green, and blue, and a transparent electrode of ITO or IZO are formed on the lower surface of a transparent substrate made of a transparent insulating material such as glass or plastic And a common electrode which is an electric field generating electrode formed of a transparent conductive oxide.

The second substrate 230 may be a TFT (Thin Film Transistor) substrate. Though not specifically shown in FIG. 3, for example, a thin film transistor composed of a gate electrode, a gate insulating film, a semiconductor layer, a resistive contact layer, and a source / drain electrode is formed on a transparent substrate made of a transparent insulating material such as glass or plastic, And a pixel electrode that is an electric field generating electrode formed of a transparent conductive oxide such as ITO or IZO.

The plastic transparent substrate that can be used for the first substrate 210 and the second substrate 230 can be formed of a material such as PET (polyethylene terephthalate), polycarbonate (PC), polyimide (PI), polyethylene naphthalate (PEN) polyether sulfone, PAR (polyarylate) and COC (cycloolefin copolymer), but the present invention is not limited thereto. Also, the first substrate 210 and the second substrate 230 may be made of a flexible material.

The liquid crystal layer 220 may be a twisted nematic (TN) mode having a positive dielectric anisotropy, a VA (VA) mode or a horizontal orientation (IPS, FFS) mode of liquid crystals having negative dielectric anisotropy.

Although the TN mode is shown as an example in Fig. 5, it is not limited thereto. 5, when there is no voltage difference between the pixel electrode and the common electrode, that is, the electric field generating electrode, an electric field is not applied to the liquid crystal layer 220. As shown in FIG. 5, The liquid crystal has a structure in which the long axis direction is arranged parallel to the surfaces of the first substrate 210 and the second substrate 230 and is twisted by 90 ° from the first substrate 210 to the second substrate 230 .

The polarized light of linearly polarized light passes through the liquid crystal layer 220 and changes due to retardation due to the refractive index anisotropy of the liquid crystal. When the dielectric anisotropy (DELTA epsilon) of the liquid crystal and the chiral pitch or the thickness of the liquid crystal layer 220, i.e., the cell gap, are adjusted, the linearly polarized light direction of the light passing through the liquid crystal layer 220 is 90 °.

The backlight unit 300 may generally include a light source, a light guide plate, a reflective film, and the like. Depending on the configuration of the backlight, it can be arbitrarily divided into a direct-down system, a sidelight system, and a planar light source system.

Hereinafter, the present invention will be described in more detail with reference to Production Examples, Comparative Examples and Experimental Examples.

≪ Preparation Example 1 &

A polyvinyl alcohol film (thickness: 30 占 퐉, degree of polymerization: 2400, degree of saponification: 99.0% or more, VF-PE3000, Kuraray Co.) was swollen in an aqueous solution at 25 占 폚, Was further stretched in an aqueous solution of boric acid at 55 캜 to obtain a final elongation of 6 times. Thereafter, the polyvinyl alcohol film was dried in a 50 占 폚 chamber for 3 minutes to prepare a polarizer (thickness 12 占 퐉).

TMP tris (2-mercaptoacetate) (TMPMA) purchased from Aldrich Co. and Trimethylolpropane Tricacrylate (TMPTA) purchased from Aldrich as a vinyl monomer were mixed at a molar ratio of 1: 1 as a thiol monomer, TPO IGURE 754 were mixed in a weight ratio of 4: 6, and 1.5% by weight of the initiator was added thereto. Subsequently, the above-mentioned monomer composition was coated on a PET film (Toyobo Co., A4100 film) which had been subjected to release treatment on one side to a thickness of 25 μm using a bar coater and then exposed to 650 mJ light intensity using a metal halide exposure machine To prepare a cured film.

Thereafter, the above film was laminated on both sides of the polarizer using an adhesive having a thickness of 2 to 3 탆 and ultraviolet cured to prepare a polarizing film.

≪ Preparation Example 2 &

1,3,5-Triazine-2,4,6 ( 1H , 3H , 5H ) -trione and 1,3,5-tri-2-propen-1-yl- were purchased from Aldrich, A polarizer and a film were produced in the same manner as in Production Example 1, and these were laminated to prepare a polarizing film.

≪ Preparation Example 3 &

Except that triallyl-1,3,5-triazine-2,4,6 ( 1H , 3H , 5H ) -trione (TTT) purchased from Aldrich Co. was used as a vinyl monomer, And a film were prepared and laminated to prepare a polarizing film.

≪ Preparation Example 4 &

A polarizer and a film were prepared in the same manner as in Preparation Example 1 except that PE tetrakis (2-mercaptoacetate) (PETMA) purchased from Aldrich Co. was used as a thiol-based monomer, and these were laminated to prepare a polarizing film.

≪ Production Example 5 &

1,3,5-Triazine-2,4,6 ( 1H , 3H , 5H ) -trione and 1,3,5-tri-2-propen-1-yl- were purchased from Aldrich, , A polarizer and a film were produced in the same manner as in Production Example 4, and laminated to prepare a polarizing film.

≪ Production Example 6 &

Except that triallyl-1,3,5-triazine-2,4,6 ( 1H , 3H , 5H ) -trione (TTT) purchased from Aldrich Co. was used as the vinyl monomer, And a film were prepared and laminated to prepare a polarizing film.

≪ Production Example 7 >

A polarizer and a film were prepared in the same manner as in Production Example 4 except that Ethene, 1,1 '- [oxybis (2,1-ethanediyloxy)] purchased from Aldrich Co. was used as a vinyl monomer, A film was prepared.

≪ Production Example 8 &

Polarizers and films were prepared in the same manner as in Production Example 1 except that Tris [2- (3-mercaptopropionyloxy) ethyl] isocyanuratevdipentaerythritol purchased from Aldrich Co. was used as a thiol-based monomer, and these were laminated to prepare polarizing films.

≪ Production Example 9 &

1,3,5-Triazine-2,4,6 ( 1H , 3H , 5H ) -trione and 1,3,5-tri-2-propen-1-yl- were purchased from Aldrich, , A polarizer and a film were produced in the same manner as in Production Example 8, and then laminated to prepare a polarizing film.

≪ Production Example 10 &

Except that triallyl-1,3,5-triazine-2,4,6 ( 1H , 3H , 5H ) -trione (TTT) purchased from Aldrich Co. was used as the vinyl monomer, And a film were prepared and laminated to prepare a polarizing film.

≪ Production Example 11 &

Polarizers and films were prepared in the same manner as in Production Example 8 except that Ethene, 1,1 '- [oxybis (2,1-ethanediyloxy)] purchased from Aldrich Co. was used as a vinyl monomer, A film was prepared.

≪ Production Example 12 &

A polyvinyl alcohol film (thickness: 30 占 퐉, degree of polymerization: 2400, degree of saponification: 99.0% or more, VF-PE3000, Kuraray Co.) was swollen in an aqueous solution at 25 占 폚, Was further stretched in an aqueous solution of boric acid at 55 캜 to obtain a final elongation of 6 times. Thereafter, the polyvinyl alcohol film was dried in a 50 占 폚 chamber for 3 minutes to prepare a polarizer (thickness 12 占 퐉).

2-mercaptoacetate (TMPMA), purchased from Aldrich, as a thiol monomer, and 1,3,5-Triazine-2,4,6 ( 1H , 3H , 5H ) -trione, 1,3,5-tri-2-propen-1-yl in a molar ratio of 1: 1, TPO and IGURE754 as initiators were mixed in a weight ratio of 4: 6, A first composition was prepared by thorough stirring. As the thiol-based monomer, PE tetrakis (2-mercaptoacetate) (PETMA) purchased from Aldrich and triallyl-1,3,5-triazine-2,4,6 ( 1H , 3H , 5H ) -trione (TTT) were mixed at a molar ratio of 1: 1, TPO and IGURE754 as initiators were mixed in a weight ratio of 4: 6, and 1.5% by weight of the initiator was added.

Subsequently, the first composition was coated on a PET film (Toyobo Co., Ltd., A4100 film) which had been subjected to release treatment on one side to a thickness of 25 μm using a bar coater and then exposed to 650 mJ light with a metal halide exposure machine And exposed to prepare a cured film.

Thereafter, the film was laminated on one surface of the polarizer using an adhesive having a thickness of 2 to 3 탆, then cured by ultraviolet rays, and the second composition was coated on the other surface of the polarizer to produce a polarizing film again cured by ultraviolet rays.

≪ Comparative Example 1 &

A polyvinyl alcohol film (thickness: 30 占 퐉, degree of polymerization: 2400, degree of saponification: 99.0% or more, VF-PE3000, Kuraray Co.) was swollen in an aqueous solution at 25 占 폚, Was further stretched in an aqueous solution of boric acid at 55 캜 to obtain a final elongation of 6 times. Thereafter, the polyvinyl alcohol film was dried in a 50 占 폚 chamber for 3 minutes to prepare a polarizer (thickness 12 占 퐉).

Then, a TAC film (Kotaka Minolta Co., Ltd., KC8UX, thickness: 80 mu m) was prepared. Thereafter, the above TAC film was laminated on both sides of the polarizer using an adhesive having a thickness of 2 to 3 탆 and ultraviolet cured to prepare a polarizing film.

≪ Comparative Example 2 &

A polarizer was produced in the same manner as in Comparative Example 1, except that a PET film (Japan, Toyobo Co., TA044, thickness: 80 占 퐉) was prepared instead of the TAC film and the PET film was laminated on both surfaces of the polarizer. .

<Experimental Example 1: Measurement of moisture permeability>

The moisture permeabilities of the polarizer protective films prepared according to Production Examples 1 to 11 and Comparative Examples 1 and 2 were measured and the results are shown in Table 1 below.

Polarizer protective film thickness (탆) Water permeability (g / m ² · day) Production Example 1 25 52 Production Example 2 25 45 Production Example 3 25 55 Production Example 4 25 48 Production Example 5 25 40 Production Example 6 25 52 Production Example 7 25 90 Production Example 8 25 60 Production Example 9 25 50 Production Example 10 25 65 Production Example 11 25 120 Comparative Example 1 80 1000 Comparative Example 2 80 55

Referring to Table 1, it can be confirmed that the polarizer protective film produced according to Production Examples 1 to 11 has a good moisture-proof property despite its relatively small thickness.

&Lt; Experimental Example 2: Reliability Evaluation, Polarization and Transmission Characteristic Measurement >

Optical characteristics (polarization degree (P) and transmittance (Ts)) of the polarizing films prepared according to Production Examples 1 to 12 and Comparative Examples 1 and 2 were measured using a VAS-7100 spectrometer manufactured by JASCO, And the results are shown in Table 2 below.

For reliability evaluation, the sample was attached to a 10.1-inch glass substrate having a thickness of 0.5 mm and quantitated by measuring the variation of the transmittance and the change of the glass substrate warpage after 500 hours at 60 ° C. and 95% relative humidity. The transmittance and the degree of polarization were measured at room temperature. On the other hand, the polarization degree is defined by the following equation (1).

[Equation 1]

Degree of polarization _{(P) = [(T 1} - T 2) / (T 1 + T 2)] 1/2

Here, T ₁ is the parallel transmittance obtained when the pair of polarizers are arranged in parallel with the absorption axes, and T ₂ is the orthogonal transmittance obtained when the pair of polarizers are arranged so that the absorption axes are perpendicular to each other.

Reliability evaluation Room temperature transmittance Room temperature polarization Ts (%) Glass bending Ts (%) P (%) Production Example 1 ○ ○ 42.5 99.9946 Production Example 2 ◎ ○ 42.5 99.9947 Production Example 3 ○ ○ 42.4 99.9942 Production Example 4 △ ○ 42.5 99.9946 Production Example 5 ◎ ○ 42.6 99.9956 Production Example 6 △ ○ 42.5 99.9946 Production Example 7 △ ○ 42.5 99.9946 Production Example 8 ○ ○ 42.5 99.9946 Production Example 9 ○ ○ 42.5 99.9945 Production Example 10 △ ○ 42.5 99.9946 Production Example 11 X △ 42.5 99.9947 Production Example 12 ○ ○ 42.5 99.9947 Comparative Example 1 X X 42.8 99.9972 Comparative Example 2 ◎ ○ 42.2 99.9924

* Transmittance (Ts) Reliability Evaluation

?: 0% to 1.5%

?: 1.6% to 2.5%

?: 2.6% to 5%

X: 5.1% or more

* Glass bending reliability evaluation

?: 0% to 0.5%

O: 5% to 10%

B: 10% to 15%

X: 15% or more

Referring to Table 2, it can be seen that the polarizing films prepared according to Production Examples 1 to 12 have excellent transmittance and polarization degree and excellent reliability.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10: polarizer,
20, 20-1: adhesive layer,
30, 30-1: Polarizer protective film
40, 50: adhesive layer
60, 70: release film
100, 100-1, 100-2, 110, 120: Polarizing film
1000: display device

Claims (8)

A polarizer having a thickness of 5 占 퐉 to 20 占 퐉;
A first polarizer protective film comprising a thioether group and having a thickness of 25 占 퐉 to 40 占 퐉 and disposed on one side of the polarizer; And
A first adhesive layer disposed between the polarizer and the first polarizer protective film;
A polarizing film comprising:
Wherein the first polarizer protective film comprises a copolymer of a thiol-based monomer and a vinyl-based monomer as a copolymer,
Wherein the polarizing film is attached to a glass substrate having a thickness of 0.5 mm and the change amount of warping of the glass substrate after lapse of 500 hours at 60 DEG C and 95% relative humidity is 15% or less. The method according to claim 1,
A second polarizer protective film comprising the thioether group and having a thickness of 25 [mu] m to 40 [mu] m and disposed on the other surface of the polarizer; And
And a second adhesive layer disposed between the polarizer and the second polarizer protective film. The method according to claim 1,
And a coating layer comprising the thioether group and having a thickness of from 5 占 퐉 to 25 占 퐉 and disposed on the other surface of the polarizer. The method according to claim 1,
And an optical functional layer disposed on the first polarizer protective film. The method according to claim 1,
Wherein the first polarizer protective film further comprises an ultraviolet absorber. The method according to claim 1,
Wherein the first polarizer protective film has a water vapor transmission rate (WVTR) of 1 g / m ² · day to 100 g / m ² · day at 40 ° C. and 90% relative humidity. Display panel; And
A polarizing film according to any one of claims 1 to 6 disposed on one or both sides of the display panel;
. 8. The method of claim 7,
Wherein the display panel is a liquid crystal display panel including a liquid crystal layer disposed between transparent substrates.

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