KR101349964B1 - Polyester film for protectiing polarizing plate - Google Patents

Abstract

The present invention relates to a polyester film for protecting a polarizing plate, and more particularly, there is no non-uniform interference of light, and the polarizing plate can be precisely inspected by the cross nicol method of the polarizing plate, and has excellent surface contamination prevention and antistatic properties. It relates to a protective polyester film. To this end, the polarizing plate protective polyester film according to the present invention is a base film which is a single layer or a multilayer polyester film, and 200 to 2000 parts by weight of a binder resin and a crosslinking agent based on 100 parts by weight of a conductive polymer resin on at least one side of the base film. It characterized in that the antistatic coating liquid consisting of ~ 100 parts by weight and 50 to 500 parts by weight of the fluorine compound is applied.

Description

POLYESTER FILM FOR PROTECTIING POLARIZING PLATE}

The present invention relates to a polyester film for protecting a polarizing plate, and more particularly, there is no non-uniform interference of light, and the polarizing plate can be precisely inspected by the cross nicol method of the polarizing plate, and has excellent surface contamination prevention and antistatic properties. It relates to a protective polyester film.

In recent years, with the rapid spread of mobile phones and personal computers, the demand for liquid crystal displays (LCDs), which can be lighter, thinner, lower power consumption and higher quality, has been significantly increased, compared to conventional CRTs. The growth of the technology is spectacular. As an example of such a large screen of the LCD, the use of the LCD is rapidly increasing in recent years for TV use of more than 40 inches. In a large-sized LCD, a bright large screen LCD is realized by increasing the brightness of a backlight assembled in the LCD, assembling a film for improving brightness into the backlight unit, and the like.

In the so-called large, high luminance type LCD, the luminance of the display screen tends to be further increased to improve visibility, but the small bright spots present in the display are often a problem, and polarizers and phase shifts incorporated into the display are often a problem. In a member such as a plate or a retardation polarizing plate, fine foreign matter which is not a problem in the conventional low luminance type LCD is starting to become a problem. Therefore, it is important to prevent the incorporation of foreign matters in the manufacturing process, and to improve inspection accuracy that can be reliably recognized as a defect even if foreign matters are mixed.

For example, visual inspection by the cross-Nicol method is generally used for defect inspection of a polarizing plate, and inspection by an automatic foreign substance inspection apparatus using a cross-Nicol method is also carried out for a polarizing plate etc. used for a large- . In this cross nicol method, two polarizing plates are quenched by orthogonal to their orientation axes and defects or defects appear as bright spots. Especially, the cross nicol method is a cross nicol method. When the automatic inspection is performed, the polyester protective film is laminated on the surface of the polarizing plate. When the orientation angle of the polyester protective film is not controlled, the quenching state is broken and light leakage occurs to prevent foreign substances or defects. There is a problem that it is easy to miss and often interferes with the inspection, and a defect occurs.

The present invention has been made to solve the above problems, the object of the present invention is not interference interference of light, it is possible to perform a precise inspection in the inspection by the cross nicol method of the polarizing plate, surface contamination prevention and antistatic It is an object of the present invention to provide a polyester film for protecting a polarizing plate having excellent characteristics.

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

The said object is 200-2000 weight part of binder resins, 40-100 weight part of crosslinking agents, and a fluorine-type compound 50 with respect to the base film which is a single layer or a multilayer polyester film, and 100 weight part of conductive polymer resins on at least one surface of the said base film. It is achieved by a polarizing plate protective polyester film characterized in that the antistatic coating liquid consisting of ~ 500 parts by weight is applied.

Here, the conductive polymer resin is characterized in that the composition consisting of polythiophene and poly anion or a polythiophene derivative and a polyanion.

Preferably, the binder resin is one selected from a carbonyl group, a hydroxyl group, an acryl group, a urethane group, a carboxyl group, an amide group, an imide group, a carboxylic acid, maleic anhydride and maleic acid, or a resin containing two or more functional groups. It features.

Preferably, the crosslinking agent is a crosslinking agent selected from the group consisting of an isocyanate compound, a carbonylimide compound, an oxazoline compound or a melamine compound.

Preferably, the fluorine-based compound is a fluorine-based silane coupling agent of the formula

(Formula 1)

이고,

ego,

Wherein Y is CF3-, CF3-CF2-, CF3-CF2-CF2-, (CF3) 2-CFO-, or CF3- (CF2) y-CH2-O- (y is an integer between 1 and 8) R is an alkyl group having 1 to 4 carbon atoms, X is a methoxy, ethoxy, methoxyethoxy, chlorine atom, l is an integer of 0 to 12, m is an integer of 0 to 2, n is 1 to 3 It is an integer, and it is characterized by m + n = 3.

Preferably, the polarizing plate protective polyester film has an angle of 10 ° or less in the main orientation axis, a refractive index in the direction perpendicular to the main orientation axis in the film plane direction, and 1.6400 or less, and a film with visible light (λ = 589 nm). The birefringence is 0.012 or less, the water contact angle of at least one surface of the film is 85 degrees or more, and the surface resistance value is 1X10 ⁹ Ω / □ or less.

According to the present invention, there is no interference nonuniformity of light, and precise inspection can be performed in the inspection by the cross nicol method of a polarizing plate, and it has the effect of being excellent in surface contamination prevention and antistatic property.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those skilled in the art that these embodiments are provided by way of illustration only for the purpose of more particularly illustrating the present invention and that the scope of the present invention is not limited by these embodiments .

The polyester film for polarizing plate protection which concerns on this invention is 200-2000 weight part of binder resins, and a crosslinking agent 40-100 weight with respect to 100 weight part of conductive polymer resins in the base film which is a single | mono layer or multilayer polyester film, and at least one surface of the said base film. It is characterized in that the antistatic coating liquid consisting of parts by weight and 50 to 500 parts by weight of the fluorine compound.

The base film used was a composition polymerized with a dicarboxylic acid first component and an ethylene glycol diol component, and as the dicarboxylic acid component constituting the polyester, terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid and orthophthalic acid. Aliphatic dicarboxylic acids and aliphatic dicarboxylic acids such as aromatic dicarboxylic acids, adipic acid, azaline acid and sebacic acid and decane dicarboxylic acid, and the like, and the diol component constituting the polyester. Examples thereof include aliphatic diols such as ethylene glycol, propanediol, butanediol, neophenglycol and hexanediol, aliphatic diols such as 1,4-cyclohexanedimethanol, and aromatic diols.

A polyester chip can be manufactured by mixing particle | grains using the said composition using the well-known technique TPA method or DMT method. The synthesized polyester chip may be molded into a film by the following manufacturing method, but is not limited to this manufacturing method.

First, the polyester chip synthesized in the above composition is dried using a dryer or vacuum dryer such as a hopper dryer or paddle dryer, melted at a temperature of 200 to 300 ° C, and extruded into a film form. In extrusion, conventional methods, such as a T-die method and a tubular method, are used. Rapid cooling after extrusion yields an unstretched film. The unstretched film thus obtained is at a temperature of at least Tg and less than Tg + 15 ° C., preferably at a ratio of 2.0 to 5.0 times in the longitudinal direction at a temperature of at least Tg and less than Tg + 10 ° C., preferably at a ratio of 2.5 to 4.5 times. Stretch. The film stretched in the longitudinal direction is stretched at a ratio of 3.0 to 7.0 times, preferably 3.5 to 6.5, in the transverse direction. In order to impart heat shrinkage stability and thermal stability to the stretched film, a polyester base film may be obtained by heat treatment at a temperature of 200 to 250 ° C.

In addition, in order to improve the transparency of the film, the base film may be composed of a laminated film of two or more layers, a method of blending particles only to the surface layer may also be preferably used. In this case, the surface layer means at least one of the inner and outer layers, and of course, the particles may be blended into both the surface and the back surface.

In addition, the polyester film for protecting the polarizing plate according to the present invention is composed of an antistatic coating solution containing a conductive polymer resin and a binder resin, a crosslinking agent and a fluorine-based silane on one or both sides of the base film and the coating solution is at least one side of the surface of the base film The coating film is dried to provide a polyester film excellent in transparency, solvent resistance, water repellent antifouling property, and antistatic property.

The antistatic coating solution is preferably made of 200 to 2000 parts by weight of the binder resin, 40 to 100 parts by weight of the crosslinking agent and 50 to 500 parts by weight of the fluorine compound based on 100 parts by weight of the conductive polymer resin.

Hereinafter, the configuration of the antistatic coating solution will be described in more detail.

(A) Conductive Polymer (Conductive Polymer Resin)

A water dispersion (Baytron P, Bayer) consisting of 0.5% by weight of poly (3,4-ethylenedioxythiophene) and 0.8% by weight of polystyrenesulfonic acid (molecular weight MN = 150,000) was added to impart antistatic properties. use.

(B) binder resin

The water-dispersible or water-soluble binder resin is provided to improve adhesion between the coating layer of the antistatic layer and the single layer or multilayer polyester film, which is a base film, and includes a carbonyl group, a hydroxyl group, an acrylic group, a urethane group, a carboxyl group, an amide group, As a preferable example of using an aqueous dispersion or water-soluble binder resin having an imide group, any one selected from the group consisting of polyacrylic, polyurethane, epoxy, polyester, vinyl and amide resins is used. Each of these skeletal structures may have a composite structure substantially by copolymerization or the like. Examples of the binder having a composite structure include acrylic graft polyester, acrylic graft polyurethane, vinyl resin graft polyester, vinyl resin graft polyurethane, and the like.

(C) crosslinking agent

The crosslinking agent is used to improve the solvent resistance between the coating layer of the antistatic layer and the single layer or multilayer polyester film which is the base film, and is preferably an isocyanate compound, a carbonylimide compound, an aziridine compound, an oxazoline compound, And it is used any one selected from the group consisting of melamines.

(D) Fluorine silica dispersion composition (fluorine type compound)

The fluorine-based silica dispersion composition for imparting the water repellency of the antistatic layer is obtained by reacting a fluorine-based silane coupling agent, silica particles, water or an organic solvent with a constant temperature for a predetermined time under an acid catalyst. The fluorine-based silane coupling agent is used having a structure of the formula (1).

(Formula 1)

Wherein Y is CF3-, CF3-CF2-, CF3-CF2-CF2-, (CF3) 2-CFO-, or CF3- (CF2) y-CH2-O- (y is an integer between 1 and 8) R is an alkyl group having 1 to 4 carbon atoms, X is a methoxy, ethoxy, methoxyethoxy, chlorine atom, l is an integer of 0 to 12, m is an integer of 0 to 2, n is 1 to 3 It is an integer and m + n = 3.

Specific examples of the fluorine-based silane coupling agent corresponding to Chemical Formula 1 include trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, trifluoropropyltrichlorosilane, heptafluoropropyltrimethoxysilane, heptafluoro Propyltriethoxysilane and the like.

The size of the silica particles used is preferably between 5nm ~ 1㎛, organic solvents are hexane, cyclohexane, heptane, octane, methylcyclohexane, toluene, benzene, methanol, ethanol, isopropanol, butanol, pentane Hydrocarbons such as ol, phenol, ethyl ether, propyl ether, acetone, methyl ethyl ketone, cellosolve, cellosolve acetate, alcohol, ether, ester, carboxylic acid, and halogen-substituted hydrocarbons. It is preferable that isopropanol, butanol, normal hexane, toluene and the like are used, and these organic solvents may be used alone or in combination of two or more thereof.

The antistatic coating solution in which the conductive polymer resin, the binder resin, the crosslinking agent, and the fluorine-based silane coupling agent are mixed contains 0.5 to 10.0% by weight as a solid content, and is coated and dried on one or both surfaces of the polyester base film to prevent water repellency and antistatic layer. It provides a polyester protective film having a.

Moreover, in the polyester film for polarizing plate protection which concerns on this invention, it is important that the inclination (orientation angle) of an orientation main axis is 10 degrees or less. If the orientation angle exceeds 10 degrees, when the polarizing plate is inspected by the cross nicol method, the quenched light may be distorted, which may cause a problem in the polarizing plate quality inspection.

Moreover, it is preferable that the polyester film for polarizing plate protection which concerns on this invention is 1.6400 or less in the refractive index of a right angle direction in the in-plane direction of a film with respect to a main orientation axis. When the refractive index exceeds 1.6400, it is because the fluctuation | variation of a film orientation angle tends to become large, and it acts as an obstacle at the time of the cross nicol inspection of a polarizing plate.

Moreover, in the polyester film for polarizing plate protection which concerns on this invention, it is preferable that birefringence of the film by visible light ((lambda = 589 nm) is 0.012 or less.

In addition, the polarizing plate protective polyester film according to the present invention is characterized in that the contact angle of water to the coating layer is water repellency of 85 degrees or more and the surface resistance value is 1X10 ⁹ Ω / □ or less.

Hereinafter, the present invention will be described in more detail in the Examples. However, the following examples are only examples of the present invention and the present invention is not limited thereto.

[Production of Polyester (A)]

100 parts by weight of dimethyl terephthalate and 60 parts by weight of ethylene glycol were used as starting materials, and magnesium acetate salt was added as a catalyst to the reactor, the reaction starting temperature was set at 150 ° C, and the reaction temperature was gradually increased with distillation of methanol, After 3 hours, it was 230 ° C. After 4 hours, the transesterification reaction was substantially terminated. Ethyl acid phosphate was added to the reaction mixture, which was then transferred to a polycondensation tank, followed by addition of 0.04 parts by weight of antimony trioxide, followed by polycondensation reaction for 4 hours. That is, the temperature was gradually raised from 230 ° C to 280 ° C. On the other hand, the pressure gradually decreased from the normal pressure, and finally 0.3 mmHg. After the start of the reaction, the reaction was stopped at the point corresponding to the intrinsic viscosity of 0.625 dl / g due to the change in the stirring power of the reaction tank, and the polymer was discharged under nitrogen pressure to obtain a polyester chip. The intrinsic viscosity of this polyester was 0.625 dl / g.

[Production of Polyester (B)]

In the production method of the polyester (A), after the addition of ethyl acid phosphate, the ethylene glycol slurry of the synthetic elastic calcium particles having an average particle size of 0.8 µm and a particle size distribution value of 1.6 is made to have a content of 1% by weight of the polyester of the particles. The polyester (B) was obtained using the method similar to the manufacturing method of polyester (A) except having added. Obtained polyester (B) was intrinsic viscosity 0.625 dl / g.

[Production and Coating Method of Polyester Film for Polarizing Plate Protection]

A raw material mixed with the polyester (A) and (B) chips at a ratio as shown in Table 1 below was used as a layer material, and 100% of the polyester (A) chip was used as a b layer, a: Two extruders were respectively supplied to make a b: a three-layer laminated film and melt-extruded at 290 ° C., and then the surface temperature was changed to 40 ° C. using electrostatic applied adhesion method, with a layer as the outer layer and b layer as the inner layer. It cooled and solidified on the set cooling roll and obtained the unstretched sheet. Then, the film was stretched in the longitudinal direction as shown in Tables 1 to 3 below, and after the corona discharge treatment on the cross section of the film, the coating solution prepared as in Tables 1 to 3 was applied using the # 5 Mayer bar. And lateral stretch temperature, lateral stretch magnification, and heat processing temperature were implemented on conditions similar to Tables 1-3, respectively, and the polyester film for polarizing plate protection of width 1,000mm was obtained, respectively. The total thickness of the obtained film was 38 μm, and the thickness of the a: b: a layer was 2 μm: 34 μm: 2 μm.

Meanwhile, in Tables 1 to 3, the unit of temperature is “° C.”.

Item Example 1 Example 2 Example 3 Raw material condition a layer raw material blending ratio
(weight%) (A): (B)
= 95: 5 (A): (B)
= 90:10 (A): (B)
= 80:20 Film forming conditions Longitudinal drawing ratio 2.9 2.9 2.9 Longitudinal stretching temperature 90 90 90 Lateral draw ratio 5.4 5.2 4.8 Transverse stretching temperature 120 120 120 Heat treatment temperature 200 200 200 Coating liquid Conductive Polymer Resin
Bayer, Baytron P 100 parts by weight 100 parts by weight 100 parts by weight Acrylic Binder Resin
Nippon Carbide, Y8003B 400 parts by weight 400 parts by weight 400 parts by weight Melamine family
(Cytec, CYMEL385) 100 parts by weight 100 parts by weight 100 parts by weight Fluorine compound
(3M company, FC-4430) 50 parts by weight 50 parts by weight 50 parts by weight Total solids 2.0 wt% 2.0 wt% 2.0 wt% Results Orientation Angle (degrees) ○ ○ nβ ○ ○ ○ △ n ○ ○ ○ Surface resistance (Ω / □) ○ ○ ○ Water contact angle (degrees) ○ ○ ○ Visual inspection ○ ○ ○ Foreign material visibility ○ ○ △

Item Example 4 Example 5 Example 6 Raw material condition a layer raw material blending ratio
(weight%) (A): (B)
= 95: 5 (A): (B)
= 90:10 (A): (B)
= 80:20 Film forming conditions Longitudinal drawing ratio 2.9 2.9 2.9 Longitudinal stretching temperature 90 90 90 Lateral draw ratio 5.4 5.2 4.8 Transverse stretching temperature 120 120 120 Heat treatment temperature 200 200 200 Coating liquid Conductive Polymer Resin
Bayer, Baytron P 100 parts by weight 100 parts by weight 100 parts by weight Acrylic Binder Resin
Nippon Carbide, Y8003B 500 parts by weight 400 parts by weight 300 parts by weight Melamine family
(Cytec, CYMEL385) 150 parts by weight 80 parts by weight 100 parts by weight Fluorine compound
(3M company, FC-4430) 100 parts by weight 50 parts by weight 50 parts by weight Total solids 2.0 wt% 2.0 wt% 2.0 wt% Results Orientation Angle (degrees) ○ ○ ○ nβ ○ ○ ○ △ n ○ ○ ○ Surface resistance (Ω / □) ○ ○ ○ Water contact angle (degrees) ○ ○ ○ Visual inspection ○ ○ ○ Foreign material visibility ○ ○ △

Item Comparative Example 1 Comparative Example 2 Raw material condition a-layer raw material blending ratio (wt%) (A) :( B) = 95: 5 (A) :( B) = 90: 10 Film forming conditions Longitudinal drawing ratio 3.3 3.3 Longitudinal stretching temperature 90 90 Lateral draw ratio 4.0 3.8 Transverse stretching temperature 120 120 Heat treatment temperature 240 240 Coating liquid Conductive Polymer Resin
Bayer, Baytron P 20 parts by weight 100 parts by weight Acrylic Binder Resin
Nippon Carbide, Y8003B 400 parts by weight 400 parts by weight Melamine family
(Cytec, CYMEL385) 100 parts by weight 100 parts by weight Fluorine compound
(3M company, FC-4430) 50 parts by weight 10 parts by weight Total solids 2.0 wt% 2.0 wt% Results Orientation Angle (degrees) X X nβ X X △ n X X Surface resistance (Ω / □) X ○ Water contact angle (degrees) ○ X Visual inspection X X Foreign material visibility X X

Hereinafter, the characteristic evaluation of the polyester film for polarizing plate protection which concerns on an Example and a comparative example is demonstrated in detail.

(1) Intrinsic viscosity measurement of polyester

After precisely weighing 1 g of polyester, 100 ml of a mixed solvent of phenol / tetrachloroethane = 50/50 (weight ratio) was added to dissolve and measured at 30 ° C.

(2) Orientation angle

After sampling the end position and center position of the width direction of the produced film to A4 size, the orientation angle was measured using MOA (molecular orientation).

(Circle): Orientation angle is 10 degrees or less

Ⅹ: orientation angle is greater than 10 degrees

(3) perpendicular refractive index of the film main alignment axis (nβ)

After sampling the end position and center position in the width direction of the manufactured film in A4 size, using an Abbe refractometer manufactured by Atago Optical Co., Ltd., the refractive index in the direction perpendicular to the main alignment axis in the film plane was measured to obtain an average value. It was.

○: nβ is 1.6400 or less

Ⅹ: nβ is greater than 1.6400

(4) birefringence

After sampling the end position and center position of the width direction of the produced film to A4 size, by the difference of the refractive index (nx) of the film width direction by visible light ((lambda = 589 nm), and the refractive index (ny) of the orthogonal direction, It is an absolute value obtained by the following formula.

Δn = l (nx)-(ny) l

○: Δn is 0.012 or less

Ⅹ: Δn is greater than 0.012

(5) water contact angle

On the coated surface of the produced film, using a contact angle measuring instrument (manufactured by Kyowa Interface Science), the ion-exchanged water was measured by distillation with purified water obtained by distillation, and the average value was taken after a total of five measurements. .

○: water contact angle is 85 degrees or more

Ⅹ: water contact angle is less than 85 degrees

(6) surface resistance

On the coated surface of the produced film, a surface resistance measuring instrument (manufactured by Mitsubishi Corporation) was used to install a sample in an environment at a temperature of 23 ° C. and a relative humidity of 45%, and then measured surface resistance in accordance with JIS K7149, and measured a total of five times. The average value was then taken.

○: Surface resistance value is 10 ⁹ Ω / □ or less

Ⅹ: Surface resistance exceeds 10 ⁹ Ω / □

(7) visual inspection

Laminate using a pressure-sensitive adhesive so that the main orientation axis of the produced film is parallel to the alignment axis of the polarizing film, and the other polarizing film is superimposed so that the orientation axis is orthogonal, so that the produced film is at the top. Place it. After that, the bottom part was irradiated with white light, and ten inspectors were visually observed to evaluate visual inspection under cross nicol based on the following criteria.

Criteria for visual inspection under cross nicol

(Good testability) ○> △> Ⅹ (bad testability)

Among the above judgments, the one above Δ is a level that can be used without problems in actual use.

(8) foreign material visibility

Laminate using a pressure-sensitive adhesive so that the main orientation axis of the produced film is parallel to the alignment axis of the polarizing film, and the other polarizing film is superimposed so that the orientation axis is orthogonal, so that the produced film is at the top. Place it. When manufacturing a polarizing plate here, black metal powder (foreign substance) which has a 50 micrometer size was mixed between an adhesive and a polarizing film so that it might become 50 pieces / m <2>. Thereafter, white light was irradiated to the lowermost part, and 10 inspectors were visually observed to evaluate whether or not foreign matters mixed under cross nicol could be detected according to the following classification. In addition, at the time of a measurement, it evaluated using three places of film | membrane of the center part and both ends of the obtained film, and the number of the detected foreign matter had the largest result, and made foreign material visibility of the film.

Classification criteria for foreign substance visibility under cross nicol

(Circle): 40 or more m <2> of foreign objects detected

(Triangle | delta): 25 or more m <2> of foreign objects detected

Ⅹ: The number of detected foreign substances is less than 25 / ㎡

Among the above determinations, the one above Δ is a level that can be used without problems in actual use.

As mentioned above, although this invention was demonstrated about embodiment considered to be the most preferable at this time, this invention is not limited to embodiment disclosed in this specification, and is contrary to the summary or idea of the invention grasped | ascertained from the Claim and the whole specification. Changes may be made without departing from the scope of the present invention, and they should be understood as being the technical scope of the present invention.

The present invention enables to perform a precise inspection in the inspection by the cross nicol method of a polarizing plate for a large LCD TV, especially 40 inches or more, can provide a polarizing plate protective polyester film excellent in surface contamination prevention and antistatic properties, It can be seen that the industrial value of the invention is very high.

Claims (5)

In the polyester film for polarizing plate protection,
Layer a, which is a mixture of different polyesters A and polyester B in a weight ratio of 95: 5 to 80:20, is formed on two sides of the layer b of polyester A, laminated in three layers, and layer a: b : A layer of polyester having a thickness of 2 μm: 34 μm: 2 μm, stretched at a ratio of 2.9 times in the longitudinal direction at 90 ° C., and stretched at a ratio of 4.8 to 5.4 times in the transverse direction at 120 ° C., followed by 200 A base film heat-fixed at ℃,
Antistatic coating liquid consisting of 200 to 2000 parts by weight of binder resin, 40 to 100 parts by weight of crosslinking agent and 50 to 500 parts by weight of fluorine compound is applied to at least one side of the base film with respect to 100 parts by weight of conductive polymer resin,
The angle of the main orientation axis is 10 degrees or less, the refractive index in the direction perpendicular to the main orientation axis in the film plane direction is 1.6400 or less, the birefringence of the film due to visible light (λ = 589 nm) is 0.012 or less, and at least the film The water contact angle of one side is 85 degrees or more, and surface resistance value is 1x10 <^{9> (} ohm) / square or less, The polyester film for polarizing plate protections characterized by the above-mentioned. The method of claim 1,
The conductive polymer resin is a composition consisting of polythiophene and poly anion or a polythiophene derivative and a polyanion, characterized in that the polarizing plate protective polyester film. The method of claim 1,
The binder resin is a resin selected from carbonyl group, hydroxyl group, acrylic group, urethane group, carboxyl group, amide group, imide group, carboxylic acid, maleic anhydride, maleic acid or two or more kinds of functional groups, characterized in that Polyester film for polarizing plate protection. The method of claim 1,
The fluorine compound is a fluorine silane coupling agent of the following formula (1),
(Formula 1)

ego,
Wherein Y is CF3-, CF3-CF2-, CF3-CF2-CF2-, (CF3) 2-CFO-, or CF3- (CF2) y-CH2-O- (y is an integer between 1 and 8), R is an alkyl group having 1 to 4 carbon atoms, X is methoxy, ethoxy, methoxyethoxy, chlorine atom, l is an integer of 0-12, m is an integer of 0-2, n is an integer of 1-3 It is and m + n = 3, The polyester film for polarizing plate protections characterized by the above-mentioned. delete