KR100902033B1 - Manufacturing method of anti-static polyester film - Google Patents

Abstract

The present invention comprises the steps of uniaxially stretching a polyester base film, preparing an antistatic coating solution containing a conductive polymer resin, a polyurethane resin, a crosslinking agent and a fluorine resin, on one or both sides of the uniaxially stretched polyester film. It provides a method for producing an antistatic polyester film comprising coating the coating solution to form an antistatic layer and biaxially stretching the polyester base film with the antistatic layer formed.

Through this, when the film is washed with water or alcohol, the antistatic agent of the antistatic layer is not dropped or dissolved. In addition, excellent antifouling function and adhesion to the adhesive tape can be improved.

Antistatic, Polyester Film, Biaxially Stretched

Description

Manufacturing Method of Antistatic Polyester Film {MANUFACTURING METHOD OF ANTI-STATIC POLYESTER FILM}

The present invention relates to a method for producing an antistatic polyester film, and more particularly, by adding a fluororesin and a polyurethane resin to an antistatic layer formed on one side or both sides of a polyester film, and having excellent transparency and antistatic property, The present invention relates to a method for producing an antistatic polyester film having excellent function by improving peel force and antifouling performance.

With the development of industrialization, the damage caused by the generation of static electricity has increased in many fields, ranging from various electronic and electric devices, information and communication fields, and general household goods, and thus, the prevention of static electricity in these devices and industrial sites has become a very important problem. Antistatic means discharging the charge accumulated on the surface of the insulator in an appropriate manner. To prevent the antistatic, an antistatic layer capable of discharging the charge accumulated on the surface of the product is formed. In particular, since impurities or dust adhere and discharge occurs in the manufacturing process of the film or the process of processing the film, there may be a problem in that a flammability risk occurs when an organic solvent is used in these processes. In addition, since when used as a material for electrical, electronic components, etc. cause static damage, it is essential to give the antistatic performance when using them.

The antistatic technology described above may include internal addition using anionic compounds such as organic sulfonates and organic phosphates, methods for depositing metal compounds, methods for applying conductive inorganic particles, methods for applying low molecular type anionic or cationic compounds, And a method of applying a conductive polymer. The internal addition method using anion compounds such as sulfonate and organic phosphate has the advantages of low cost, time-dependent change or stability, but the disadvantage of inhibiting the inherent characteristics of the film support and the limitation of the antistatic effect, due to blooming There is a problem such as deterioration of adhesion between the film and the lamination, and the method of depositing a metal compound is excellent in antistatic properties and has been widely used in conductive films in recent years, but the manufacturing cost is so high that it is used only for specific applications. In addition, the coating method using a low molecular type anionic or cationic compound has been widely applied because of its relatively good antistatic effect and advantages in terms of manufacturing cost. However, there is an antistatic limit and thus the surface resistance of about 10 ⁹ Ω / sq or less Due to the properties that can not be obtained, and due to the characteristics of antistatic properties in combination with moisture in the air, when the moisture content in the air is low, the antistatic property is greatly reduced, the solvent resistance is very bad and there is a possibility of transfer to another side Application is greatly limited. As conductive polymers such as polyaniline, polypyrrole or polythiophene, which are dissolved in water and organic solvents, have been developed, many researches have been conducted to impart conductivity to an antistatic polyester film or other polymer surface. Among them, a general method is to prepare doped conductive polymers and coat them on various polymer surfaces including polyester in a suitable solvent. In this case, the appropriate binder may be dissolved together to improve mechanical properties such as adhesion or surface hardness of the coating layer. As an example, US Pat. No. 4,959,430 discloses 3,4-ethylenedioxythiophene, a kind of conductive polymer monomer, and ferrictoluene sulfonate (Iron (III) p-toluenesulfonate), which is an oxidizing agent, and the synthesis thereof 3,4-polyethylenedioxythiophene, a conductive polymer, has been disclosed. Specifically, 3,4-ethylenedioxythiophene and ferrictoluenesulfonate are mixed at room temperature and heated to provide a blue conductivity. The polymer 3,4-polyethylenedioxythiophene was prepared. Synthesized 3,4-polyethylenedioxythiophene may be commercially available in the form of dispersed in water, but if the mixture is left for a long time at room temperature by mixing 3,4-ethylenedioxythiophene and ferric toluenesulfonate, this may occur. To prevent this, a small amount of reaction inhibitor imidazole was mixed. In Japanese Patent Laid-Open No. Hei 1-313521, an electrically conductive polymer composed of poly (3,4-dialkoxythiophene) and a polyanion can be obtained by oxidative polymerization of 3,4-alkoxythiophene in the presence of a polyanion. A conductive polymer having high electrical conductivity, high chemical stability and high transparency of the coating film during film formation has been proposed. However, when the coating liquid containing such an electrically conductive polymer is applied to a plastic substrate, it is not easy to obtain a coating film that satisfies all the performances of adhesion, transparency, water resistance, solvent resistance and electrical conductivity to the substrate at the same time. In particular, a method of crosslinking a binder resin with a crosslinking agent or the like has been attempted in order to improve the water resistance of the coating film. Japanese Patent Application Laid-Open No. 6-73271 discloses an alkoxysilane having an epoxy group for the purpose of improving the adhesion of an electrically conductive polymer layer composed of poly (3,4-dialcoholthiophene) and a polyanion and a layer adjacent thereto. Although the compound was used, it was difficult to provide water resistance to the coating film.

In the antistatic products using the various antistatic types described above, the demand for antistatic films is rapidly increasing with the growth of the IT business including the LCD and PDP markets. The antistatic type that is widely used in this application is the situation where the cationic antistatic type is most commonly known, and a film using a conductive polymer is entering the market as a high quality film. Finally, there is a demand for antifouling performance while having excellent antistatic performance, and there is a difficulty in manufacturing a film that simultaneously implements both functions in an inline coating. In addition, depending on the purpose of the product, in the case of peeling off the last process as a protective film, the tape is removed by mechanical automatic method. At this time, if the adhesive strength between the tape and the antistatic surface is low, the protective film will not fall or affect the product during the falling process. There is a problem that has a problem that there is a demand for a product having a high peel force with the tape.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to realize excellent antistatic performance by using a conductive polymer and to improve tape peeling force by using a polyurethane resin and to crosslink using an appropriate crosslinking agent. It is to provide an excellent antistatic polyester film production method for optics by adjusting the density to improve solvent resistance and coating performance, and to improve antifouling properties by adding a fluorine resin.

Method for producing an antistatic polyester film of the present invention for achieving the above technical problem, the step of uniaxially stretching the polyester base film, the antistatic containing a conductive polymer resin, polyurethane resin, crosslinking agent and fluorine resin Preparing a coating solution, applying the coating solution to one or both surfaces of the uniaxially stretched polyester film to form an antistatic layer, and biaxially stretching the polyester base film on which the antistatic layer is formed.

The antistatic layer is preferably made of 100 to 1000 parts by weight of polyurethane resin, 100 to 1000 parts by weight of crosslinking agent and 30 to 300 parts by weight of fluororesin based on 100 parts by weight of the conductive polymer resin.

The conductive polymer resin is preferably prepared by polymerizing polyanion with polythiophene or a derivative thereof, and the polyurethane resin is preferably a water dispersion type, and functional groups such as a hydroxyl group, an amine group, and a carboxyl group are at least one. It is a resin that contains more than one species.

The crosslinking agent may be preferably any one or more compounds selected from the group consisting of isocyanate, carbonylimide, oxazoline, epoxy and melamine.

The fluororesin may preferably be tetrafluoroethylene-based resin.

Hereinafter, the present invention will be described in more detail.

Method for producing an antistatic polyester film of the present invention, the step of uniaxially stretching the polyester base film, the step of preparing an antistatic coating liquid containing a conductive polymer resin, polyurethane resin, crosslinking agent and fluorine resin, 1 Forming an antistatic layer by applying the antistatic coating liquid to one or both surfaces of the axially stretched polyester film and biaxially stretching the polyester base film on which the antistatic layer is formed.

First, the step of uniaxially stretching a polyester base film is demonstrated.

The polyester film used in the present invention is not limited in kind, but a known one conventionally known as a base film of an antistatic coating can be used. In the present invention, a description will be made of polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc., but the polyester film of the present invention is not limited thereto. The polyester which comprises the said film points out the polyester obtained by polycondensing aromatic dicarboxylic acid and aliphatic glycol. As aromatic dicarboxylic acid, terephthalic acid, 2, 6- naphthalenedicarboxylic acid, etc. are mentioned, As aliphatic glycol, ethylene glycol, diethylene glycol, 1, 4- cyclohexane dimethanol, etc. are mentioned. Typical polyesters include polyethylene terephthalate (PET), polyethylene-2,6-naphthalenedicarboxylate (PEN), and the like. The said polyester can also be a copolymer containing a 3rd component. Examples of the dicarboxylic acid component of the copolyester include isophthalic acid, phthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, sebacic acid, and oxycarboxylic acid (for example, P-oxybenzoic acid). Examples thereof include ethylene glycol, diethylene glycol, propylene glycol, butanediol, 1,4-cyclohexanedimethanol, neopentylglycol, and the like. These dicarboxylic acid components and glycol components may use 2 or more types together.

The polyester resin of the above-described configuration is melted by an extruder after vacuum drying, extruded into a sheet through a T-DIE, adhered to a casting drum by pinning on a cooling roll, and solidified by cooling to unstretched poly. Obtaining an ester sheet and performing a uniaxial stretching of 2.5 to 4.5 times by the circumferential speed ratio difference between a roll and a roll in the roll heated above the glass transition temperature of a polyester resin, produces a uniaxial stretched polyester film.

Next, the steps of preparing the antistatic coating solution will be described.

The antistatic coating liquid of the present invention is applied to one or both sides of the polyester film to form an antistatic layer, and in detail, includes a conductive polymer resin, a polyurethane resin, a crosslinking agent, a fluorine resin and a solvent, which are solid contents, in more detail. Is 100 to 1000 parts by weight of the polyurethane resin, 100 to 1000 parts by weight of the crosslinking agent and 30 to 300 parts by weight of the fluororesin with respect to 100 parts by weight of the conductive polymer resin.

Specifically, the conductive polymer resin included in the antistatic coating solution preferably uses an aqueous dispersion of polyanion and polythiophene or an aqueous dispersion of polyanion and polythiophene derivative to impart antistatic properties.

The said polyanion is an acidic polymer, and is high molecular carboxylic acid, high molecular sulfonic acid, polyvinyl sulfonic acid, etc. The polymer carboxylic acid includes polyacrylic acid, polymethacrylic acid, polymaleic acid, and the like, and the polymer sulfonic acid includes polystyrene sulfonic acid.

It is preferable to make the poly anion excessively present in the solid content weight ratio with respect to the polythiophene or the polythiophene derivative in terms of conductivity, and the poly anion is more than 1% by weight with respect to 1% by weight of the polythiophene or polythiophene derivative. 5 weight% or less is preferable. Preferably it is more than 1 weight% and 3 weight% or less.

In the present invention, an aqueous dispersion of a polymer containing 0.5 wt% of poly (3,4-ethylenedioxythiophene) and 0.8 wt% of polystyrenesulfonic acid (molecular weight Mn = 150,000) is used.

Next, a polyurethane resin is demonstrated.

Polyurethane resin used in the present invention is applied to the polyester film is added to increase the tape peeling force of the film, preferably the polyurethane resin is a water dispersion type, hydroxyl group, amine group, carboxyl group Resin which at least 1 type or more of functional groups, such as an isocyanate group, an epoxy group, and an oxazoline group, is contained is used.

On the other hand, the amount of the polyurethane resin to be added may be added to 100 to 1000 parts by weight of the polyurethane resin with respect to 100 parts by weight of the conductive polymer resin. If the amount of the polyurethane resin added is less than 100 parts by weight of the polyurethane resin, the tape peeling force is lowered and the function cannot be expressed. If the amount is more than 1000 parts by weight, the tape peeling force is sufficiently secured, but the antistatic performance is deteriorated. Can be.

Next, a crosslinking agent is demonstrated.

The crosslinking agent used in the present invention is used to improve solvent resistance and coating performance of the antistatic layer and the polyester film, and is preferably composed of an isocyanate type, carbonylimide type, oxazoline type, epoxy type, and melamine type. Any one or more compounds selected from the group can be used.

On the other hand, the amount of the crosslinking agent to be added may be added to 100 to 1000 parts by weight of the crosslinking agent resin relative to 100 parts by weight of the conductive polymer resin. If the addition amount of the crosslinking agent resin is less than 100 parts by weight, antistatic properties may be less likely to be expressed, and solvent resistance may be weak and whitening may occur. Moreover, when it exceeds 1000 weight part, the transparency may be good but the problem which becomes difficult to express antistatic property may arise.

Next, the fluororesin is explained.

The fluorine resin added to the present invention is applied to a polyester film and is added to improve the antifouling property, water contact angle and solvent resistance of the film. Polytetrafluoroethylene, tetrafluoroethylene, perfluoroalkyl vinyl ether air Perfuo alkyl, ethylene trifluoride, Fluorinated ethylene copolymer propylene, ethylene, tetrafluoroethylene, copolymer chloro trifluoroethylene, tetrafluoroethylene, chloro trifluoroethylene, Polytetrafluoroethylene copolymer, polyvinyli fluoride, polyvinylidene fluoride, and the like, and tetrafluoroethylene is preferably used.

On the other hand, the amount of the fluorine resin added may be added to 30 to 300 parts by weight of the fluororesin relative to 100 parts by weight of the conductive polymer resin. If the added amount of the fluorine resin is less than 30 parts by weight, the antifouling property is lowered, and if it exceeds 300 parts by weight, the transparency of the film may be lowered and the antistatic performance may deteriorate.

The antistatic coating solution of the present invention described above is preferably prepared so that the content of solids is 0.5 to 10.0 wt% with respect to 100 wt% of the total coating solution, and more preferably the content of solids is 1.0 to 5.0 wt%. Can be. When the content of the solid content is less than 0.5% by weight, it is not sufficient to express the film formation and the antistatic function of the coating layer, and when it exceeds 10.0% by weight, the transparency of the film is affected, which is not preferable.

On the other hand, the solvent used in the antistatic coating liquid is preferably an aqueous coating liquid mainly composed of water. The coating liquid used for this invention may contain the suitable organic solvent of the grade which does not impair the effect of this invention for the purpose of the improvement of applicability | paintability, transparency improvement, etc .. For example, isopropyl alcohol, butyl cellosolve, t-butyl cellosolve, ethyl cellosolve, acetone, ethanol, methanol and the like can be preferably used. However, when a large amount of organic solvent is contained in the coating liquid, the content may be 10% by weight or less in the coating liquid, preferably 5% by weight or less, since there is a risk of explosion in the drying, stretching and heat treatment processes when applied to the in-line coating method. to be.

Next, an antistatic coating solution prepared on at least one surface of the uniaxially stretched polyester film is formed to form an antistatic layer. Specifically, the method of applying the antistatic coating liquid is not particularly limited, but may be used in the meyer bar (gravure) method, gravure method, etc. Before the application by introducing a polar group on the surface of the film, the adhesion between the coating layer and the film Corona discharge treatment is preferable to improve the coating property. In addition, to improve the stability, wetting and coating leveling of the antistatic coating solution, alcohols such as ethanol, isopropanol, isopropyl alcohol, ethers such as ethyl cellosolve, t- butyl cellosolve, Ketones, such as methyl ethyl ketone and acetone, amines, such as dimethylethanolamine, or an ionic / nonionic surfactant can be used in mixture of 1 or more types.

Finally, the uniaxially stretched polyester film on which the antistatic layer is formed is redrawn to prepare a biaxially stretched polyester film. Specifically, the film is stretched in the direction perpendicular to the direction of uniaxial stretching, and the preferred stretching ratio is 3.0 to 7.0 times. Thereafter, an antistatic polyester film is prepared through heat setting, and the thickness of the polyester film is usually 5 to 300 µm, preferably 10 to 250 µm.

The antistatic polyester film produced by the above-described method has a transparent but antistatic layer with a water contact angle of 95 ° or more, a tape peeling force of 300 g / in or more, and a surface resistance of 1 even after cleaning the surface with hot water and ethanol. It has a numerical value of 10 ⁹ dB / sq or less.

After all, the antistatic polyester film of the present invention is easy to remove the water repellent function, tanol resistance and pressure-sensitive adhesive due to the antistatic layer formed by applying the antistatic coating solution containing the fluorine resin and the polyurethane resin on one or both sides of the substrate Having a property and having a high tape peeling force can provide a polyester film suitable for screen enlargement needs.

Hereinafter, the present invention will be described in more detail with reference to Examples. This embodiment is intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

<Example 1>

Step 1: 1 axis Stretch  Preparation of Polyester Film

Polyethylene terephthalate pellets having an ultimate viscosity of 0.625 µg / g containing 20 ppm of amorphous spherical silica particles having an average particle diameter of 2.5 µm were sufficiently dried at 160 ° C. for 7 hours using a vacuum dryer, and then melted and extruded. By contacting the cooling drum through the electrostatic application method through to form an amorphous unstretched sheet, it was heated again and stretched 3.5 times in the direction of film advancement at 95 ℃ to prepare a uniaxially stretched polyester film. Next, a corona discharge treatment was performed on the surface of the film to be coated to prepare a polyester film.

Step 2: 2-axis Stretch  Preparation of Polyester Film

100 parts by weight of a conductive polymer resin (Nagase Comtec Co., DENATRON # 5002SZ; an aqueous dispersion containing 0.5% by weight of poly3,4-ethylenedioxythiophene and 0.8% by weight of polystyrenesulfonic acid) as a solid on the corona-treated side. 200 parts by weight of a urethane resin (Hepschem, HWU-1123A: polyether polyurethane dispersion of an anion containing a hydroxyl group, an amine group, and an alkyl group functional group), 200 parts by weight of a melamine crosslinking agent (Cytec, CYMEL385), tetra An antistatic coating solution was prepared by mixing 100 parts by weight of fluoroethylene (Dupont, SLA-NEW) and 2 parts by weight of a surfactant resin (ILS, EXP4051; an acetylenic diol component). At this time, the solid content was to contain 1.5% by weight based on the total antistatic coating liquid. The antistatic coating solution was applied to the uniaxial polyester film prepared in step 1 using a # 6 Meyer bar. After coating, the coating solution was applied at 105 to 140 ° C. tender section, dried, stretched 3.5 times in the direction perpendicular to the traveling direction of the film, and heat-treated at 240 ° C. for 4 seconds to prepare a biaxially stretched antistatic polyester film having a thickness of 38 μm. It was.

<Example 2>

100 parts by weight of conductive polymer resin (Nagase Chemtech Co., Ltd.), 400 parts by weight of polyurethane resin (Hepse Chem Co., Ltd.), 300 parts by weight of epoxy crosslinking agent (Nagase Chemtech Co., Ltd., DENACOL EX-614), 150 parts by weight of fluorine resin (Dupont Corporation) And biaxially stretched antistatic polyester film was carried out in the same manner as in Example 1 except that an antistatic coating solution was prepared using 2 parts by weight of a surfactant resin (Ilshin Chemical Co., Ltd.) so that the total solid content was 2.0% by weight. Prepared.

<Example 3>

100 parts by weight of conductive polymer resin (Nagase Chemtech Co., Ltd.), 300 parts by weight of polyurethane resin (Hepse Chem Co., Ltd.), 500 parts by weight of epoxy crosslinking agent (Nagase Chemtech Co., Ltd.), 50 parts by weight of fluorine resin (Dupont Corporation) and surfactant resin (Ilshin Chemical Co., Ltd.) A biaxially stretched antistatic polyester film was prepared in the same manner as in Example 1 except that an antistatic coating solution was prepared by mixing 2 parts by weight to obtain a total solid content of 2.5% by weight. .

Comparative Example 1

A biaxially stretched antistatic polyester film was prepared in the same manner as in Example 1 except that a polyurethane resin and a fluorine resin were not added during the preparation of the antistatic coating solution.

Comparative Example 2

A biaxially stretched antistatic polyester film was prepared in the same manner as in Example 1 except that no polyurethane resin was added during the preparation of the antistatic coating solution.

Comparative Example 3

A biaxially stretched antistatic polyester film was prepared in the same manner as in Example 1 except that no fluorine resin was added when preparing the antistatic coating solution.

Experimental Example

The following physical properties were evaluated for the antistatic polyester films prepared in Examples 1 to 3 and Comparative Examples 1 to 3, and the results are shown in Table 1.

One. Water contact angle

Water contact angle was measured by the sessile drop method with purified water obtained by distilling ion-exchanged water using a contact angle measuring instrument (Kyowa Interface Science Co., Ltd .; model name Dropmaster 300), and measuring five times at different positions. The average value was then taken.

2. Antistatic

The surface resistance was measured in accordance with JIS K7194 after the sample was installed in an environment of temperature 23 ° C. and humidity 50% RH using an antistatic measuring instrument (Mitsubishi Co., Ltd .; model name MCP-T600).

3. Water resistance

After leaving the film in running water for 1 minute using tap water, the film was dried at 50 ° C. for 10 minutes, and antistatic properties and appearance were evaluated as follows.

○: no cloudiness and no antistatic properties

4. Ethanol Resistance

After ethanol was soaked in a cotton swab while maintaining the angle of the cotton swab at 45 degrees, the coated film surface was reciprocated 10 times at a speed of 5cm / sec with a load of 1N at a rate of 5cm / sec, and then the state of the coated surface was evaluated based on the following criteria. .

○: little change in antistatic properties and no scratches

(Triangle | delta): When antistatic property is weakly weak or there are some scratches

Note: If the antistatic property is lost or the coating surface is peeled off.

5. Transparency ( Haze )

A sample of 10 cm x 10 cm sample was placed vertically in an HAITMATIC DIGITAL HAZEMETER (manufactured by Nippon Densoku Co., Ltd.) in a vertical position, and light was transmitted through light having a wavelength of 400 to 700 nm in a direction perpendicular to the vertically placed sample. The value was measured.

At this time, the haze value was calculated by Equation 1 below.

      Haze (%) = (1- amount of scattered light / total transmission of light) × 100

6. Tape Peel force

Nitto Denko tape NO. Was coated on the coated surface of the film obtained above using AR1000 (Chem instruments) equipment which is a peeling force measuring instrument in an atmosphere of 23 ° ± 3 and relative humidity of 50 ± 5%. After attaching 31B (thickness: 25um, width: 25mm), reciprocate and squeeze once with a rubber roller of 2kg load, and then immediately peel off 180 degrees at 0.3MPM. The peeling force value obtained at this time was measured.

TABLE 1

As can be seen from Table 1, if the polyurethane resin is not included, Comparative Examples 1 and 2 have low tape peel force values, so that the desired physical properties cannot be obtained. In Comparative Examples 1 and 3 without fluorine resin, the water contact angle value is low. It can be seen that the desired physical properties cannot be obtained. The polyester films prepared in Examples 1 to 3 having an antistatic agent layer containing a polyurethane resin and a fluororesin have a high water resistance, solvent resistance and surface resistance of not less than 1 × 10 ⁶ Ω / square while maintaining high physical properties of not less than 95 °. It can be seen that the water contact value and the tape peeling force can produce a film having a value of 300 g / in or more.

As described above, the antistatic polyester film produced by the method for producing an antistatic polyester film of the present invention has an excellent antistatic function, but an antistatic coating composition in which an appropriate amount of an antifouling function is mixed with a fluororesin and a polyurethane resin. When applied to the polyester film and washed with water or alcohol, the antistatic agent of the antistatic layer does not fall off or dissolve. In addition, excellent antifouling function and adhesion to the adhesive tape can be improved.

Although the present invention has been described in detail only with respect to the embodiments described, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and variations belong to the appended claims. .

Claims (8)

Uniaxially stretching the polyester base film; Preparing an antistatic coating liquid containing a conductive polymer resin, a polyurethane resin, a crosslinking agent, and a fluorine resin; Forming an antistatic layer by applying the coating solution to one or both surfaces of the uniaxially stretched polyester base film; And Biaxially stretching the polyester base film on which the antistatic layer is formed; manufacturing method of an antistatic polyester film comprising a. According to claim 1, wherein the antistatic coating liquid is 100 to 1000 parts by weight of polyurethane resin, 100 to 1000 parts by weight of crosslinking agent and 30 to 300 parts by weight of fluorine resin based on 100 parts by weight of the conductive polymer resin Method for producing an ester film. The method of claim 1, wherein the conductive polymer resin is a water dispersion of polyanion and polythiophene or a water dispersion of polyanion and polythiophene derivative. The method of claim 1, wherein the polyurethane resin is a water dispersion type and contains at least one or more selected from a functional group consisting of a hydroxyl group, an amine group, and a carboxyl group. . The method of claim 1, wherein the crosslinking agent is at least one compound selected from the group consisting of isocyanate, carbonylimide, oxazoline, epoxy, and melamine. Way. The method of claim 1, wherein the fluororesin is tetrafluoroethylene-based resin. The method of claim 1, wherein the coating solution has a solid content of 0.5 to 10% by weight. The method of claim 1, wherein the antistatic polyester film has a tape peeling force of 300 g / in or more and a water contact angle of 95 ° or more.