WO2017183921A1 - Polarizing plate and image display device including same - Google Patents

Abstract

The present invention relates to a polarizing plate and an image display device including the same and, more specifically, to a polarizing plate and an image display device including the same, wherein the polarizing plate comprises a polyvinyl alcohol-based polarizer and a protection substrate, which is positioned on at least one surface of the polarizer and includes a polyvinyl acetate-based resin and a cellulose-based resin. Accordingly, the polarizing plate allows a display device including the same to be weight-reduced in a form of a thin film. Further, a small physical property difference between the polarizer and a coating layer allows the polarizing plate to prevent a problem of deterioration of an optical characteristic according to a refractive index difference, etc. and problems, such as a flexion and a crack which may occur when the polarizing plate is cut or exposed to a severe environment. In addition, the polarizing plate includes the protection substrate having an excellent tensile strength and thus allows axis-twisting of the polarizer due to the contraction of the polarizer to be controlled so as to prevent problems, such as a curl and deterioration of polarizability.

Description

Polarizing plate and image display device including the same

The present invention relates to a polarizing plate and an image display device including the same.

A polarizing plate is useful as an optical component which comprises a liquid crystal display device. Conventionally, as a polarizing plate, the thing of the structure which laminated | stacked the protective layer which consists of a transparent resin film using the water-based adhesive etc. on one or both surfaces of a polarizing film is used. As such a transparent resin film, a triacetyl cellulose film (TAC film) is used a lot in the point which is excellent in optical transparency and moisture permeability. The polarizing plate is bonded to the liquid crystal cell with an adhesive via another optical function layer as necessary, and inserted into the liquid crystal display device.

In recent years, with the development of a liquid crystal display device into a mobile device such as a notebook type personal computer, a cellular phone, and a car navigation system, a thin plate weight and high durability (high mechanical strength) are required for a polarizing plate constituting the liquid crystal display device. In addition, in liquid crystal displays for mobile applications, it is desired to be usable even under moist heat, and high moisture heat resistance is also required for the polarizing plate used for this. However, when the polarizing plate is conventionally exposed to high humidity, especially high temperature and high humidity for a long time, the polarization performance is reduced. There existed a problem that it fell or the polarizing film shrink | contracted. Therefore, the protective layer laminated | stacked on a polarizing film is requested | required to improve mechanical strength and the ability (shrinkage suppression force) which suppresses shrinkage of a polarizing film by making hardness high while simultaneously being thin and lightweight.

However, in the polarizing plate which laminated | stacked the TAC film as a protective layer, it was difficult to make thickness of a protective layer into 20 micrometers or less from a viewpoint of the handleability and durability at the time of work, and there existed a limit to thin weight reduction.

Korean Laid-Open Patent No. 2016-0002372 discloses a method of manufacturing a polarizing plate and a polarizing plate.

An object of the present invention is to provide a thin-film light weight polarizing plate.

An object of the present invention is to provide a polarizing plate that can prevent problems such as refractive index difference, bending, cracks due to the difference in physical properties between the polarizer and the protective film.

An object of this invention is to provide the polarizing plate which can control the axial distortion of a polarizer by shrinkage, and can suppress the fall of polarization degree and a curvature generation.

1. A polarizing plate having a polyvinyl alcohol polarizer and a protective substrate comprising polyvinylacetate resin and cellulose resin located on at least one surface thereof.

2. In the above 1, wherein the polyvinyl acetate-based resin is a polarizing plate comprising a repeating unit of the following formula 1 and formula 2 in a molar ratio of 6: 4 to 10: 0:

[Formula 1]

[Formula 2]

.

.

3. In the above 1, wherein the cellulose resin is a polarizing plate comprising a repeating unit of the formula (3):

[Formula 3]

(Wherein R is independently from each other H, an alkyl group having 1 to 8 carbon atoms, a phenyl group, a hydroxyalkyl group having 1 to 8 carbon atoms, an alkanoyl group having 1 to 8 carbon atoms or a benzoyl group).

4. In the above 1, wherein the cellulose resin is 10 to 990 parts by weight based on 100 parts by weight of the polyvinyl acetate resin.

5. In the above 1, the thickness of the protective substrate is 10 to 60㎛ polarizing plate.

6. In the above 1, wherein the protective substrate is in direct contact with the polarizer.

7. Image display device including the polarizing plate of any one of the above 1 to 6.

The polarizing plate of the present invention does not include a separate polarizer protective film, and its thickness is very thin. Accordingly, the display device including the polarizing plate can be thin in weight.

Since the polarizing plate of the present invention includes a protective material of the same resin series as the polarizer, there is little difference in physical properties between the polarizer and the coating layer, thereby minimizing the problem of deterioration of optical properties due to the difference in refractive index. In addition, it is possible to reduce problems such as bending and cracks that may occur during cutting, exposure to harsh environments, and the like.

The polarizing plate of the present invention is excellent in durability such as heat resistance, heat and humidity resistance, heat shock resistance, and adhesion between the polarizer and the protective substrate.

The present invention is provided with a protective substrate having excellent tensile strength, it is possible to control the polarization of the polarizer due to the shrinkage of the polarizer to reduce problems such as lowering the polarization degree and curl.

1 is an NMR result of the resin of Preparation Example 2-1.

2 is an NMR result of the resin of Preparation Example 2-2.

3 is an NMR result of the resin of Preparation Example 2-3.

4 is an NMR result of the resin of Preparation Example 2-4.

The present invention relates to a polarizing plate and an image display device including the same, and more particularly, by providing a polyvinyl alcohol-based polarizer and a protective base including a polyvinylacetate-based resin and a cellulose-based resin located on at least one surface thereof. It is possible to reduce the thickness of the display device and to reduce the difference in the physical properties between the polarizer and the coating layer, thereby reducing the problems of deterioration of optical properties due to the difference in refractive index, and problems such as bending and cracks that may occur during cutting and harsh environment exposure. The present invention relates to a polarizing plate having a protective base having excellent tensile strength and controlling a twist of the polarizer due to shrinkage of the polarizer to reduce problems such as a decrease in polarization degree and curl, and an image display device including the same.

Hereinafter, the present invention will be described in detail.

The polarizing plate of the present invention includes a polyvinyl alcohol-based polarizer and a protective substrate including polyvinylacetate-based resin and cellulose-based resin located on at least one surface thereof.

Conventional polarizing plates include a polarizer and a protective film adhered with an adhesive on both surfaces thereof. In such a case, the two layers of the adhesive layer and the protective film are laminated, so that the thin film is difficult.

In addition, a film of a material different from the polarizer is generally used as a protective film. There is a problem in that refractive index difference, curling occurs during cutting, curling, cracks, etc. occur in severe environmental exposure, and an interface between different materials exists. Problems may occur.

However, in the polarizing plate of the present invention, a coating layer including a polyvinylacetate resin having a structure similar to that of a resin forming a polarizer on one or both sides is positioned, and the adhesive force is expressed even without a separate adhesive layer to reduce the weight of the thin film. It is possible to minimize problems such as refractive index difference, curl, crack, peeling.

In addition, the polarizing plate of the present invention by including a cellulose-based resin to improve the tensile strength of the protective substrate in the protective substrate, it is possible to control the axial distortion of the polarizer due to shrinkage of the polarizer to reduce problems such as lowering the polarization degree, curl.

The polyvinyl alcohol-based polarizer may be prepared according to a process including the steps of swelling, dyeing, crosslinking, stretching, washing with water, and drying the polyvinyl alcohol-based resin film.

The polyvinyl alcohol-based resin constituting the polarizer is, for example, acetalization and urethaneization of a polyvinyl alcohol obtained by saponifying a polyvinyl acetate resin, a saponified copolymer of a monomer having copolymerizability with vinyl acetate, and polyvinyl alcohol. And modified polyvinyl alcohols obtained by etherification or esterification.

Examples of the monomer having copolymerizability with vinyl acetate include unsaturated carboxylic acid type, unsaturated sulfonic acid type, olefin type, vinyl ether type, and acrylamide type monomer having an ammonium group.

The mol% value of the vinyl alcohol repeating unit of the polyvinyl alcohol-based resin is usually 85 to 100 mol%, preferably 98 mol% or more. In addition, the degree of polymerization of the polyvinyl alcohol-based resin is usually 1,000 to 10,000, preferably 1,500 to 5,000.

The thickness of the polyvinyl alcohol polarizer is not particularly limited, and may be, for example, 10 to 150 μm, preferably 10 to 60 μm.

A protective substrate including polyvinylacetate resin and cellulose resin is located on at least one surface of the polarizer.

Polyvinylacetate resin is excellent in adhesion to the aforementioned polyvinyl alcohol-based polarizer, chemically very stable, easy to form a network through crosslinking and easy to coat the surface. Thus, the coating reliability of the protective substrate is excellent.

In addition, since it is a protective material of the same resin type as the polarizer, there is little difference in physical properties between the polarizer and the protective material, thereby minimizing the lifting that may occur during cutting, and the degree of change of the protective material to the external environment is similar to that of the polarizer, such as high temperature and high humidity. Even if exposed to bad conditions for a long time, there are fewer problems such as curling and cracking.

The polyvinylacetate resin may include a repeating unit of Formula 1 below.

[Formula 1]

In addition, the polyvinylacetate resin may further include a repeating unit represented by the following Chemical Formula 2.

[Formula 2]

When further comprising a repeating unit of the formula (2) can further improve the adhesion to the polyvinyl alcohol-based polarizer, and can improve the elastic modulus of the protective substrate to suppress the shrinkage of the polarizer to reduce problems such as curl.

The molar ratio of the repeating units of Formulas 1 and 2 is not particularly limited, and may be, for example, 6: 4 to 10: 0. When the content of the repeating unit of Formula 2 is increased to exceed the molar ratio, it may be difficult to secure water resistance due to high hydrophilicity. The molar ratio is preferably 6: 4 to 999: 1 for simultaneous good adhesion with polyvinyl alcohol-based polarizers and water resistance, and simultaneously ensures superiority of adhesion, heat and moisture resistance, and safety against thermal shock. More preferably 65:35 to 98: 2.

In addition, the polyvinylacetate resin may have a degree of polymerization of 300 to 10,000, for example. If the degree of polymerization is less than 300, the mechanical properties of the coating layer may not be secured. If the degree of polymerization is greater than 10,000, the coating liquid may have a high viscosity and may be difficult to coat.

In addition, the protective base further comprises a cellulose resin.

Cellulose-based resin can significantly improve the tensile strength of the protective substrate to control the polarization of the polarizer due to the shrinkage of the polarizer to reduce problems such as lowering the polarization degree and curl. In addition, it is excellent in compatibility with the polyvinylacetate resin, and problems such as deterioration of optical properties do not occur.

The cellulose resin according to the present invention may include, for example, a repeating unit represented by the following Chemical Formula 3.

[Formula 3]

(Wherein R is independently from each other H, an alkyl group having 1 to 8 carbon atoms, a phenyl group, a hydroxyalkyl group having 1 to 8 carbon atoms, an alkanoyl group having 1 to 8 carbon atoms or a benzoyl group).

When the cellulose resin having the repeating unit is included, the tensile strength of the protective base is remarkably improved, which is preferable.

Examples of the cellulose resin including the repeating unit represented by the formula (3) include methyl cellulose, cellulose acetate, cellulose propionate, cellulose butrate, and the like.

The molecular weight of the cellulose resin is not particularly limited, and for example, the number average molecular weight may be 5,000 to 100,000. When the number average molecular weight is 5,000 or less, the film may be broken when the film is formed. When the number average molecular weight is 100,000 or more, the resin may be dissolved in a solvent and the viscosity may increase, thereby lowering the content of solids at the target viscosity.

The mixing ratio of the polyvinylacetate resin and the cellulose resin is not particularly limited and may be included, for example, in an amount of 10 to 990 parts by weight based on 100 parts by weight of the polyvinylacetate resin. In comparison, when the content of the cellulose resin is less than 10 parts by weight, the effect of improving the tensile strength of the protective substrate may be insignificant. When the content of the cellulose resin is greater than 990 parts by weight, the content of the polyvinylacetate resin is relatively low, thereby decreasing adhesion to the polarizer. Or, it may cause problems such as lifting during cutting and curling when exposed to a high temperature and high humidity environment for a long time.

Preferably, the content of the cellulose resin is 100 to 950 with respect to 100 parts by weight of the polyvinylacetate resin in terms of securing excellent adhesion to the polarizer and reducing problems caused by differences in physical properties and simultaneously securing excellent tensile strength. The amount of the cellulose-based resin may be 200 to 900 parts by weight based on 100 parts by weight of the polyvinylacetate resin.

The protective substrate including polyvinylacetate resin and cellulose resin may be formed by applying and drying the protective substrate composition on at least one surface of the polarizer.

The protective base composition may include a polyvinylacetate resin, a cellulose resin, and further include a crosslinking agent.

The content of the crosslinking agent is not particularly limited, and may be included, for example, in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the total resin.

The crosslinking agent is not particularly limited as long as it is a compound capable of acetalizing, urethanating, etherifying and esterifying the hydroxyl group of the poly (vinylacetate-vinyl alcohol) copolymer resin.

Acetalizable crosslinkers include glyoxalic acid, 4-oxo-2-butenoic acid and 2-methyl-3-oxopropanoic acid acid), 4-formyl-cyclohexanecarboxylic acid, 4-formyl-2-methyl-3-furancarboxylic acid ), 5-formyl-3-isoxazolecarboxylic acid, glutaraldehyde and the like.

The isocyanate-based crosslinking agent that can be urethane is specifically diisocyanate compounds such as tolylene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, 2,4- or 4,4-diphenylmethane diisocyanate; And adducts or trimers to polyhydric alcohol compounds such as trimethyrolpropane of diisocyanate may be used.

The etherifying crosslinking agent may use divinylsulfone, 1,3-divinylsulfonyl-2-hydroxypropane, and an epoxy or oxetane group-containing compound. have.

Esterizable crosslinking agents include malonic acid, succinic acid, glutaric acid, adipic acid, oxalic acid, tartaric acid, citric acid, 1,2,3,4-butanetetracarboxylic acid or derivatives thereof, and these may be used alone or in combination. It can mix and use 2 or more types.

The protective base composition may further include a solvent.

The solvent allows the protective substrate composition to be applied onto the polarizer and then removed by drying to allow the coating layer to be formed.

Since the polyvinylacetate resin and the cellulose resin are organic resins, the solvent may be an organic solvent. For example, methanol, ethanol, butanol, acetone, isopropyl alcohol, ethylene glycol, diethylene glycol, methyl ethyl ketone, toluene, N-methyl-2-pyrrolidone and the like can be cited. It is preferable to mix and use 2 or more types of solvent from a viewpoint of ease.

If necessary, the protective base composition may further include additives such as plasticizers, silane coupling agents, antistatic agents, leveling agents, and basic substances known in the art within the scope of not impairing the desired effect in the present invention.

The thickness of the protective base may be, for example, 10 to 60 µm, preferably 20 to 60 µm. If the thickness is less than 10 μm, the polarizer protection effect may not be sufficient. If the thickness is more than 60 μm, bubbles may occur during drying of the coating solution, thereby causing a problem of appearance defects of the polarizing plate.

The present invention also provides a method for producing the polarizing plate.

Method for manufacturing a polarizing plate according to an embodiment of the present invention includes the step of applying and drying the protective substrate composition on at least one side of the polyvinyl alcohol-based polarizer.

Unlike the conventional polarizing plate manufacturing method which coats an adhesive layer on at least one surface of a polarizer, and bonds and hardens a protective film on an adhesive layer, the manufacturing method of the polarizing plate of this invention is a protective substrate containing polyvinylacetate resin and a cellulose resin. It includes only a one-step process called formation of. Therefore, a polarizing plate can be manufactured by a simpler process.

The polyvinyl alcohol polarizer may be the aforementioned polarizer.

A protective base composition is coated and dried on at least one surface of the polarizer.

The protective base composition may include a polyvinylacetate resin and a cellulose resin and further include a solvent.

The polyvinylacetate resin may be the aforementioned polyvinylacetate resin.

The cellulose resin may be the cellulose resin described above.

The mixing ratio of the polyvinylacetate resin and the cellulose resin is not particularly limited and may be included, for example, in an amount of 10 to 990 parts by weight based on 100 parts by weight of the polyvinylacetate resin. Preferably, the cellulose resin may be 100 to 950 parts by weight based on 100 parts by weight of the polyvinylacetate resin, and more preferably, the cellulose resin may be 200 to 900 parts by weight based on 100 parts by weight of the polyvinyl acetate resin. .

The solvent allows the protective substrate composition to be applied onto the polarizer and then removed by drying to allow the coating layer to be formed.

Since the polyvinylacetate resin and the cellulose resin are organic resins, the solvent may be an organic solvent. For example, methanol, ethanol, butanol, acetone, isopropyl alcohol, ethylene glycol, diethylene glycol, methyl ethyl ketone, toluene, N-methyl-2-pyrrolidone and the like can be cited. It is preferable to mix and use 2 or more types of solvent from a viewpoint of ease.

If necessary, the protective base composition may further include additives such as plasticizers, silane coupling agents, antistatic agents, leveling agents, and basic substances known in the art within the scope of not impairing the desired effect in the present invention.

The method of applying the protective base composition is not particularly limited, and for example, the slit coating method, the knife coating method, the spin coating method, the casting method, the micro gravure coating method, the gravure coating method, the bar coating method, the roll coating method, the wire bar coating method Coating, dip coating, spray coating, screen printing, gravure printing, flexographic printing, offset printing, inkjet coating, dispenser printing, nozzle coating, capillary coating and the like can be used. .

Drying of the applied composition can be carried out by methods known in the art, such as hot air, far infrared.

The drying temperature may be for example 40 to 150 ° C., preferably 60 to 100 ° C., and the drying time may be for example 1 minute to 10 minutes. If the drying temperature and time is within the above range, the coating quality is excellent.

The thickness of the protective base may be, for example, 10 to 60 µm, preferably 20 to 60 µm. If the thickness is less than 10 μm, the polarizer protection effect may not be sufficient. If the thickness is more than 60 μm, bubbles may occur during drying of the coating solution, thereby causing a problem of appearance defects of the polarizing plate.

Moreover, this invention provides the image display apparatus containing the said polarizing plate.

The polarizing plate of this invention is applicable to various image display apparatuses, such as not only a normal liquid crystal display device but an electroluminescent display, a plasma display, and a field emission display.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but these examples are merely illustrative of the present invention and are not intended to limit the scope of the appended claims, which are within the scope and spirit of the present invention. It is apparent to those skilled in the art that various changes and modifications can be made to the present invention, and such modifications and changes belong to the appended claims.

Production Example

1. Preparation of Polarizer

The polyvinyl alcohol resin film having a thickness of 75 μm was immersed in pure water at 30 ° C. for 2 minutes with an average degree of polymerization of about 2,400 and at least 99.9 mole% of vinyl alcohol repeating units, and stretched about 1.5 times. Then, the solution was stretched by about 2.0 times while immersing for 3 minutes in a dye bath containing an aqueous solution having a weight ratio of 0.01 / 1.0 / 100 of iodine / potassium iodide / water and having a temperature of 30 ° C. Then, the film was stretched about 2.0 times while immersing for 1 minute at 53 ° C. in an aqueous solution in which potassium iodide / boric acid / water was mixed at a weight ratio of 10/5/100. Then, the resultant was washed with 15 ° C. pure water for 1.5 seconds and dried at 50 ° C. for 5 minutes to prepare a polarizer having iodine adsorbed on polyvinyl alcohol.

2-1. Preparation of Polyvinylacetate Resin

50 g of polyvinylacetate (polymerization degree 2,000) was slowly added to a jacket reactor containing 200 g of methanol, and heated at 50 ° C. for 3 hours to prepare a polymer solution having a solid content of 20%. Then, 26 g of distilled water dissolved in 0.2 g of KOH was slowly added dropwise to the polymer solution, and heated at 50 ° C. for another 3 hours to prepare a polyvinylacetate resin (solid content 18%) in which the mole% of the vinyl alcohol repeating unit was 8%. .

2-2. Preparation of Polyvinylacetate Resin

A polyvinylacetate resin having a molar percentage of vinyl alcohol repeating unit of 33.8% in the same manner as in Production Example 2-1, except that 30 g of distilled water in which 0.5 g of KOH was dissolved was added dropwise to the polymer solution of Preparation Example 2-1. Solids 17.8%).

2-3. Preparation of Polyvinylacetate Resin

Except that 32 g of distilled water in which 1.0 g of KOH was dissolved was added dropwise to the polymer solution of Preparation Example 2-1, a polyvinylacetate resin having a molar percentage of vinyl alcohol repeating unit of 52.2% in the same manner as in Preparation Example 2-1 ( 17.7% solids).

2-4. Preparation of Polyvinylacetate Resin

A polyvinylacetate resin having a molar percentage of vinyl alcohol repeating unit of 0% (solid content) in the same manner as in Production Example 2-1, except that 25 g of KOH-dissolved distilled water was added dropwise to the polymer solution of Preparation Example 2-1. 18.2%) was prepared.

The compositions of the resins of Preparation Examples 2-1 to 2-4 are shown in Table 1 below, and NMR measurement results are shown in FIGS. 1 to 4 below.

Examples and Comparative Examples

Based on 100 parts by weight of the polyvinylacetate resin of Production Example 2-1, 50 parts of the cellulose resin represented by A-1 is contained, 2.0 parts of crosslinking agent B-1 and 0.3 parts of leveling agent (BYK-3400) A coating layer having a thickness of 40 μm was formed on both surfaces of the polarizer with the coating solution added. Thereafter, the mixture was left to stand at 23 ° C. and 60% for 3 days, and an adhesive was coated on the coating layer to prepare a polarizing plate of Example 1.

The remaining examples and comparative examples were produced by changing the thickness and composition shown in Table 2 in the same manner as in Example 1.

Experimental Example

1. Forced peel test

Sheaths (half cuts) were placed on one side of the protective substrates of the polarizers of the examples and comparative examples with a knife. Subsequently, the polarizing plate was deformed until the half cut portion was convex. Then, the state of the coating layer of the broken part was visually observed. Evaluation criteria are as follows.

◎: no peeling

○: less than 0.5 mm

×: 0.5 mm or more

2. Durability test

The polarizing plates of the Example and the comparative example were cut out to 50 mm x 50 mm with Thompson blade, and the state after leaving for 500 hours in 80 degreeC and 60 degreeC 90% RH atmosphere was observed, and the transmittance | permeability and haze were measured. Evaluation criteria are as follows.

(Double-circle): No film edge part peeling, the transmittance | permeability and the difference with before the start of the durability test of haze are less than 1%

(Circle): No film edge part peeling, the transmittance | permeability and the difference with before the start of the durability test of a haze are 1% or more and less than 3%

(Triangle | delta): The film edge part 0.2 mm or less peeling, transmittance | permeability, and the durability test of the haze The difference from the start of the durability test of haze is 1% or more and less than 3%

X: There exists a film edge part peeling, the transmittance | permeability and the difference with before the start of the durability test of haze are 3% or more

3. Thermal shock test (polarizer crack)

The polarizing plates of the Example and the comparative example were cut out to 50 mm x 50 mm with Thompson blade, and it was set as the test piece. The thermal shock test was repeated 100 cycles for 1 hour at 80 ° C and 1 hour at -40 ° C. After the thermal shock, the presence of polarizer cracks was observed from the end of the polarizing plate in the stretching direction of the polarizer, and when the polarizer cracks were observed, the length of the cracks was measured. In the case where a plurality of cracks were observed, evaluation was made using the average value. Evaluation criteria are as follows.

◎: no polarizer crack

○: less than 0.2 mm

Δ: more than 0.2 mm to less than 0.5 mm

×: 0.5 mm or more

Referring to Table 2, the polarizing plate of the embodiment using a protective substrate containing a polyvinylacetate resin and a cellulose resin, the content of the polyvinylacetate resin and cellulose resin is within the scope of the present invention is forced peeling, Excellent results for the heat, moisture and heat shock experiments were shown, but the polarizing plates of the comparative examples were not.

Claims (7)

A polarizing plate comprising a polyvinyl alcohol polarizer and a protective substrate including polyvinylacetate resin and cellulose resin located on at least one surface thereof. The polarizing plate of claim 1, wherein the polyvinyl acetate-based resin comprises repeating units represented by Chemical Formulas 1 and 2 at a molar ratio of 6: 4 to 10: 0. [Formula 1]

[Formula 2]

. The polarizing plate of claim 1, wherein the cellulose-based resin comprises a repeating unit represented by Chemical Formula 3: [Formula 3]

(Wherein R is H, an alkyl group having 1 to 8 carbon atoms, a phenyl group, a hydroxyalkyl group having 1 to 8 carbon atoms, an alkanoyl group or benzoyl group having 1 to 8 carbon atoms). The polarizing plate according to claim 1, wherein the cellulose resin is included in an amount of 10 to 990 parts by weight based on 100 parts by weight of the polyvinylacetate resin. The polarizing plate of claim 1, wherein the protective substrate has a thickness of 10 μm to 60 μm. The polarizing plate of claim 1, wherein the protective substrate directly contacts the polarizer. The image display apparatus containing the polarizing plate of any one of Claims 1-6.

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