KR101619356B1 - Anti static polyester adhesive film for improving water-proofing and surface hardness - Google Patents

Abstract

The present invention relates to an antistatic polyester excellent in water resistance and surface hardness. More specifically, the present invention relates to an antistatic polyester which is free from coloration due to an antistatic agent, does not deteriorate in water resistance even after forming a primer layer, And an antistatic polyester film excellent in surface hardness and excellent in surface hardness without causing peeling in a high temperature or high humidity environment after forming a primer layer on a base film. To this end, an antistatic polyester adhesive film excellent in water resistance and surface hardness according to the present invention is a base film, which comprises a biaxially oriented polyester film having a thickness of 50-300 占 퐉 and a biaxially oriented polyester film Layer, wherein the surface of the primer layer has an electrostatic chargeability of ¹⁰ < ¹⁰ > / m2 , Electrostatic chargeability after 10 minutes water resistance test at 90 占 폚 water is 10 ¹¹ ? / M 2 or less, and the pencil hardness of the primer layer is 1H or more.

Polyester film, antistatic property, surface hardness, water resistance, adhesive film

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an antistatic polyester film having excellent water resistance and surface hardness,

The present invention relates to an antistatic polyester excellent in water resistance and surface hardness. More specifically, the present invention relates to an antistatic polyester which is free from coloration due to an antistatic agent, does not deteriorate in water resistance even after forming a primer layer, And an antistatic polyester film excellent in surface hardness and excellent in surface hardness without causing peeling in a high temperature or high humidity environment after forming a primer layer on a base film.

In general, biaxially oriented polyesters for flat display materials, which are used in adhesive films, in particular, polyethylene terephthalate, are required to exhibit structural stability and excellent chemical properties, physical properties, thermal properties, mechanical properties, solvent resistance, durability, And is widely used in various industrial fields such as a magnetic recording medium, a capacitor, an electric and electronic parts material, a packaging material, a photographic material, various medical and industrial fields.

Despite these many advantages, however, polyester is no exception to the problems of static electricity, which is a disadvantage of all polymer films, and the lack of scratch resistance due to lack of surface hardness. First, in the case of static electricity, there is a problem not only in terms of quality but also in safety due to foreign matter adhesion, sparking, electric shock, etc. during manufacturing or processing.

Also, when a biaxially oriented polyester film is used for a flat display material, it has advantages such as high light transmittance and surface flatness, but it is weak against impact and has a disadvantage that deformation occurs at a certain temperature or more. The lack of scratch resistance due to lack of surface hardness is directly related to the quality of the product.

In order to solve the problem of static electricity and shortage of scratch resistance, a method of providing antistatic property to the primer layer of the substrate and improving the surface hardness is needed.

First, in order to impart antistatic properties, for example, an internal addition method using an organic sulfonic acid salt or an organic phosphate, a method of depositing a metal compound, a method of applying conductive inorganic particles, a method of applying an anionic or cationic compound And the like. In the case of a conventional antistatic agent, Japanese Patent Application Laid-Open No. 10-330650 discloses a coating agent which forms a coating film having antistatic property even when the antistatic agent is transparent and the humidity is not high. The coating material contains sulfonated polyaniline as an antistatic agent and a water-soluble or water-dispersible polymer in a mixed solvent of water and a water-soluble organic solvent. According to this, although a transparent antistatic coating can be easily formed on the surface of the plastic or film, there may be a slight coloring due to the sulfonated polyaniline, and there may be a disadvantage that the water-dispersible polymer deteriorates the water resistance. Japanese Patent Application No. 2000-253289 discloses an electroconductive polymer comprising a conductive polymer comprising poly (3,4-dioxythiophene) and a polyanion, a water-soluble compound having an amide group or hydroxyl group at room temperature and a self-emulsifying polyester Polyester resin aqueous dispersion in a specific ratio to a composition obtained by blending a specified amount of an alkoxysilane having an epoxy group in a composition obtained by adding a water-dispersible polyester resin to a composition obtained in a specific ratio. Such a composition is said to improve transparency, conductivity, solvent resistance, and water resistance. However, it takes time to evaporate moisture during drying using a polyester resin aqueous dispersion, and there is a risk of deterioration during storage due to reactivity with moisture of the alkoxysilane. Korean Patent No. 0430989 discloses a quick-drying transparent conductive coating liquid composition. According to Korean Patent No. 0430989, the conductive coating liquid composition is composed of a non-aqueous acrylic polymer binder solution, a conductive polymer aqueous solution and a solvent, and forms a conductive film having excellent water resistance, conductivity and transparency within a short time at about 50 ° C . Such a conductive film can improve the drying time and the water resistance because the evaporation time of the water can be shortened and the hydrophobicity can be increased by using the non-aqueous acrylic polymer binder instead of the silica sol or the water-soluble binder. However, when exposed to a high temperature or high humidity environment for a long time, there is a problem that peeling of the coating layer occurs or the surface conductivity is reduced, and it is difficult to withstand moisture and heat durability tests required for materials such as LCD or PDP.

In addition, a method of improving the surface hardness for improving the scratch resistance of the base material is to use a heat-reactive water-soluble urethane resin in place of the usual melamine or epoxy curing agent, and additionally contain a hydrogen- And has the function of improving the hardness by the mutual action between the curing agents and increasing the polar interaction between the thermoresponsive resin composition molecules to improve the function of moisture absorption.

However, there is a problem in that the problem of static electricity and lack of scratch resistance can not be completely solved by the above-described conventional techniques, and it is urgently required to develop a better technique for solving such problems.

Disclosure of the Invention The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to provide an antistatic agent which is free from coloration due to an antistatic agent, does not deteriorate water resistance even after forming a primer layer, has a short drying time, And an antistatic polyester adhesive film excellent in surface hardness and excellent in surface hardness without causing peeling in a high temperature or high humidity environment after the primer layer is formed on the base film.

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

The above object is achieved by an optical biaxially oriented polyester adhesive film excellent in water resistance and surface hardness, wherein the base film comprises a biaxially oriented polyester film having a thickness of 50 to 300 占 퐉 and a polymer layer on at least one side of the base film, but as forming a primer layer, the surface of the primer layer is electrostatic charging property is ¹⁰ 10 Ω / ㎡ or less, static at 90 ℃ water 10 minutes after the water resistance test chargeability than 10 ¹¹ Ω / ㎡, pencils of the primer layer An antistatic polyester excellent in water resistance and surface hardness is characterized by having a hardness of not less than 1H.

The primer layer contained 3.0% by weight of an antistatic resin containing 30.0% by weight of a copolymerization antistatic resin of 88.0% by weight of water, an acrylic monomer and a quaternary ammonium salt, 1.0% by weight of a curing agent containing 30.0% by weight of a polyethylene imine curing agent 3.0% by weight of a thermally responsive water-soluble urethane resin water dispersion containing 20.0% by weight of a thermally responsive water-soluble urethane resin, 1.0% by weight of a tin-based catalyst aqueous dispersion containing 10.0% by weight of a tin- 1.0% by weight of a silica particle or alumina-silica composite oxide particle dispersion containing 70.0% by weight of silica particles or alumina-silica composite oxide particles, 1.0% by weight of an anionic surfactant aqueous dispersion containing 10.0% by weight of an anionic surfactant, And then dispersed and then applied as a coating liquid.

Preferably, the surface of the base film on which the primer layer is formed has a total light transmittance of 90% or more and a haze value of 0.4 to 1.0%.

Preferably, the adhesive force between the base film and the primer layer is 100% after a 96-hour moisture resistance test at 65 ° C and 95% humidity.

Preferably, the primer layer is applied after uniaxial stretching of the biaxially oriented polyester base film.

According to the present invention, not only the adhesion between the primer layer and the substrate film is sufficient but also the charging performance is maintained even in a high humidity environment, and the film has high optical properties, excellent scratch resistance and excellent appearance characteristics.

Further, the present invention can increase the product yield by increasing the adhesion with resin used for post-processing such as prism lens processing, hard coat processing, and AR processing.

In addition, the present invention can be used throughout the various optical members due to its high transmittance and small haze value. Particularly, as optical films, base films for prism sheets used for LCDs, base films for backlights, It is useful as a coating film, a base film for AR film, a protective film for CRT, and the like.

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 .

1 is a cross-sectional view of an antistatic polyester adhesive film excellent in water resistance and surface hardness according to the present invention.

An antistatic polyester adhesive film excellent in water resistance and surface hardness according to the present invention is a base film which comprises a biaxially oriented polyester film having a thickness of 50 to 300 占 퐉 and a base film on which at least one surface of the base film is coated with a primer layer but formation, the surface of the primer layer is an electrostatic charging property is ¹⁰ 10 Ω / ㎡ or less, at 90 ℃ water 10 minutes or less water resistance and electrostatic chargeability of the 10 ¹¹ Ω / ㎡ after the test, the pencil hardness of the primer layer is not less than 1H .

As the base film, a biaxially oriented polyester film may be a known film.

An antistatic polyester excellent in water resistance and surface hardness according to the present invention is characterized in that a copolymerization antistatic resin of an acrylic monomer and a quaternary ammonium salt is used as a primer layer of the adhesive film. 2 is a chemical formula of the copolymerization antistatic agent of the acrylic monomer and the quaternary ammonium salt used in the present invention.

Further, in the case of the heat-reactive water-soluble urethane resin used for the primer layer according to the present invention, the curing agent is not limited, but it is preferable to use a thermosetting agent which hardens at a low temperature and hardens at a high temperature. As the heat curing agent, an amine type, imidazole type or dihydrazide type can be used, but it is preferable to use a dihydrazide type curing agent in terms of storage stability. As concrete examples of the amine type, there may be mentioned Azqueure MY-24, Ajyurea MY-H, Ajyurea MY-HK, Ajyure PN-23J, Ajyure PN-31J, Ajyure PN-40J (manufactured by Ajinomoto) Specific examples of the imidazole type include 2-methylimidazole, 2-undecylimidazole, 2-phenylimidazole, 2-phenyl (triphenylphosphine) Specific examples of the dihydrazide type include ADJUREURE VDH, ADJURYER UDH (manufactured by Ajinomoto), ADH, SDH, DDH, IDH (manufactured by Otsuka Chemical Co., Ltd.) , And NDH (manufactured by Japan Hydrazine Kogyo Co., Ltd.), and they can be used alone or in combination of two or more.

In the case of the heat-reactive urethane resin in the present invention, the resin further contains a sintering-generating functional group in the molecule to increase the adhesive force with the plastic substrate, as compared with the melamine or epoxy curing agent usually used.

The heat-reactive urethane resin has the following formula: -N = C = N-. This can be achieved by removing carbon dioxide from the two isocyanate groups. 3 is a conceptual diagram showing the combination of the block isocyanate and the thermosensitive resin.

When a polyisocyanate or a diisocyanate is used as a starting material, a compound containing a terminal isocyanate group can be obtained in this manner.

Further, in the present invention, a tin catalyst may be used for the polymerization reaction of the heat-reactive water-soluble urethane resin. Although the mechanism by the catalyst is not accurate, it is considered that the property of moisture resistance is improved by promoting the reaction with the terminal group of the heat-responsive water-soluble urethane resin to have an excellent adhesive force with the polyester base material.

Further, the polyethyleneimine curing agent used in the primer layer according to the present invention, as compared with the melamine or epoxy curing agent usually used, additionally contains a water-sintering functional group in the molecule, thereby increasing the adhesive force with the plastic substrate, And has the function of improving the hardness and increasing the polarity interaction between the resin composition molecules to improve the function of moisture absorption.

In the present invention, the surfactant for forming the primer layer of the biaxially oriented polyester film can be a water-soluble coating solution, and it is possible to use a known amount of an anionic or nonionic surfactant in order to increase the wettability of the base film and uniformly apply the coating solution To the substrate film.

In addition, the primer layer according to the present invention preferably contains a pH adjuster of an alkaline component, and the pH adjuster is sodium hydrogencarbonate.

In the primer layer of the present invention, an additive may be added to the coating liquid for improving the coating property and the function. Examples of such additives include organic particles, inorganic particles, defoaming agents, and the like. According to the present invention, the water-soluble polymer primer layer can contain inorganic particles having a comparatively small refractive index difference with resin to ensure running properties. When the average particle diameter of the inorganic particles used is less than 30 nm, It does not contribute to the running property and scratch resistance of the film, and does not give the effect of fine particle injection. When the average particle size of the fine particles exceeds 500 nm, there arises a problem that the haze is obstructed. Accordingly, the size of the inorganic particles according to the present invention has a particle size in the range of 30 to 500 nm, more preferably 50 to 300 nm. For example, silica particles or alumina-silica composite oxide particles are preferably used.

In the primer layer of the adhesive film of the present invention, the primer layer contains 88.0% by weight of water, an antistatic resin 3.0 containing 30.0% by weight of a copolymerization antistatic resin of an acrylic monomer and a quaternary ammonium salt, 3.0% by weight of a thermally reactive water-soluble urethane resin water dispersion containing 1.0% by weight of a curing agent containing 30.0% by weight of a polyethyleneimine curing agent, 20.0% by weight of a thermally reactive water-soluble urethane resin, 10.0% by weight of a tin- 1.0% by weight of a silica particle or alumina-silica composite oxide particle aqueous dispersion containing 1.0% by weight of a tin-based catalyst aqueous dispersion, 2.0% by weight of a pH adjusting agent, 70.0% by weight of silica particles or alumina- 1.0% by weight of an anionic surfactant aqueous dispersion containing 10.0% by weight of an active agent was added and dispersed, followed by coating with a coating liquid And that is characterized.

The surface of the base film (the surface of the base film on which the primer layer is formed) of the adhesive film of the antistatic polyester excellent in water resistance according to the present invention has a total light transmittance of 90% or more and a haze value of 0.4 to 1.0% , And the adhesive force between the base film and the primer layer is 100% after 96 hours of humidity test at 65 ° C and 95% humidity. This is because if the adhesive strength is poor compared to the conventional product, the product can not be applied.

Hereinafter, the present invention will be described in more detail with reference to various examples and comparative examples.

[Example 1]

First, the polyethylene terephthalate resin pellets were dried under reduced pressure (1.3 hPa) at 135 캜 for 6 hours, then fed to an extruder, melt extruded at about 280 캜 into a sheet, and dried on a metal roll Quenched and solidified to obtain a casting film having a thickness of 1925 탆. Next, this casting film was heated to 100 DEG C in a heated roll group and an infrared heater, and then stretched at a 3.2-fold stretching ratio in the longitudinal direction by a roll group having a peripheral speed to obtain a uniaxially oriented PET film, Respectively. The coating liquid for forming the primer layer was coated on one side of the uniaxially oriented PET film by a reverse roll method and dried. Subsequently, the film was gripped at the end with a clip, introduced into a hot air region, and dried. Thereafter, stretching was carried out at 130 占 폚 in the transverse direction at 3.2 times the stretching ratio, followed by heat setting at 240 占 폚, and then lateral relaxation at 3 占 폚 at 200 占 폚. Thus, an adhesive biaxially oriented polyester film for optical use having a thickness of 188 mu m was obtained.

In Example 1, in the film formation of the above biaxially oriented polyester film, the optical biaxially oriented polyester film having a thickness of 188 μm after film formation was applied to the adhesive film by the following method, and then applied to obtain the water resistance and surface hardness An excellent antistatic polyester adhesive film was obtained.

The coating liquid for the adhesive layer for forming the primer layer contained 3.0% by weight of an antistatic resin containing 30.0% by weight of water, 88.0% by weight of water, a copolymerization antistatic resin of an acrylic monomer and a quaternary ammonium salt, and 30.0% by weight of a polyethyleneimine curing agent 3.0% by weight of a thermally responsive water-soluble urethane resin aqueous dispersion containing 1.0% by weight of a curing agent for thermosensitive-type water-soluble urethane resin, 20.0% by weight of a thermosensitive type water-soluble urethane resin, 1.0% by weight of a tin-based catalyst aqueous dispersion containing 10.0% by weight of a tin- 2.0% by weight of an adjusting agent, 1.0% by weight of a silica particle or alumina-silica composite oxide particle aqueous dispersion containing silica particles or 70.0% by weight of alumina-silica composite oxide particles and 10.0% by weight of an anionic surfactant 1.0% by weight of the dispersion was added and dispersed to prepare a coating liquid.

[Example 2]

The coating liquid was prepared in the same manner as in Example 1 except that the thickness of the casting film was 2200 탆 and the thickness of the film after the film formation was 250 탆 in the biaxially oriented polyester film.

[Comparative Example 1]

In Comparative Example 1, in the film of the biaxially oriented polyester film of Example 1, an optical biaxially oriented polyester adhesive film having a thickness of 250 mu m after film formation was prepared by applying a coating solution by the following method Optical biaxially oriented polyester This adhesive film was obtained.

The coating liquid for the adhesive layer for forming the primer layer contained 91.0% by weight of water, 1.0% by weight of a curing agent containing 30.0% by weight of a polyethylene imine curing agent, and 20.0% by weight of a thermally responsive water-soluble urethane resin 3.0% by weight of a resin water dispersion, 1.0% by weight of a tin catalyst aqueous dispersion containing 10.0% by weight of a tin catalyst, 2.0% by weight of a pH adjusting agent, silica particles containing 70.0% by weight of silica particles or alumina- - 1.0% by weight of a silica composite oxide particle aqueous dispersion and 1.0% by weight of an anionic surfactant aqueous dispersion containing 10.0% by weight of an anionic surfactant were added and dispersed to prepare a coating liquid.

[Comparative Example 2]

In Comparative Example 2, in the film formation of the biaxially oriented polyester film of Example 1, the optical biaxially oriented polyester film having a thickness of 250 mu m after film formation was applied to the adhesive film by the following method, The biaxially oriented polyester obtained was an adhesive film.

The coating liquid for the adhesive layer forming the primer layer contained 3.0% by weight of an antistatic resin containing 94.0% by weight of water, 30.0% by weight of a copolymerization antireflection resin of an acrylic monomer and a quaternary ammonium salt, 30.0% by weight of a polyethyleneimine curing agent 1.0% by weight of a curing agent water dispersion containing 1.0% by weight of a silica particle or alumina-silica composite oxide particle aqueous dispersion containing silica particles or 70.0% by weight of alumina-silica composite oxide particles, 10.0% by weight of an anionic surfactant 1.0% by weight of a surfactant aqueous dispersion was added and dispersed to prepare a coating liquid.

[Comparative Example 3]

In Comparative Example 3, in the film formation of the biaxially oriented polyester film of Example 1, an optical biaxially oriented polyester adhesive film having a thickness of 250 mu m after film formation was prepared by applying a coating solution in the following manner, The biaxially oriented polyester obtained was an adhesive film.

The coating liquid for the adhesive layer forming the primer layer contained 1.0% by weight of an antistatic resin containing 30.0% by weight of water, 88.0% by weight of a copolymer of an acrylic monomer and a quaternary ammonium salt, and 30.0% by weight of a polyethyleneimine curing agent 1.0% by weight of a tin catalyst aqueous dispersion containing 1.0% by weight of a curing agent aqueous dispersion, 5.0% by weight of a thermally reactive water-soluble urethane resin water dispersion containing 20.0% by weight of a heat-reactive type urethane resin, 10.0% by weight of a tin- 2.0% by weight of a pH adjusting agent, 1.0% by weight of a silica particle or alumina-silica composite oxide particle aqueous dispersion containing silica particles or 70.0% by weight of alumina-silica composite oxide particles, 10.0% by weight of an anionic surfactant, 1.0% by weight of an aqueous dispersion was added and dispersed to prepare a coating liquid.

[Comparative Example 4]

In Comparative Example 4, in the film formation of the biaxially oriented polyester film of Example 1, the optical biaxially oriented polyester adhesive film having a thickness of 250 mu m after film formation was prepared by applying a coating solution by the following method, The biaxially oriented polyester obtained was an adhesive film.

The coating liquid of this adhesive layer forming the primer layer contained 5.0% by weight of an antistatic resin containing 30.0% by weight of water, 88.0% by weight of water, an acrylic antistatic resin of an acrylic monomer and a quaternary ammonium salt, 30.0% by weight of a polyethyleneimine curing agent 1.0% by weight of a thermosetting water-soluble urethane resin water dispersion containing 1.0% by weight of a curing agent water dispersion and 20.0% by weight of a thermosensitive type water-soluble urethane resin, 1.0% by weight of a tin-based catalyst aqueous dispersion containing 10.0% by weight of a tin- 2.0% by weight of a pH adjusting agent, 1.0% by weight of a silica particle or alumina-silica composite oxide particle aqueous dispersion containing silica particles or 70.0% by weight of alumina-silica composite oxide particles, 10.0% by weight of an anionic surfactant, 1.0% by weight of an aqueous dispersion was added and dispersed to prepare a coating liquid.

[Experimental Example 1]

The coating appearance of the films prepared in Examples 1 to 2 and Comparative Examples 1 to 4 was measured. Fluorescent lamps and three wavelengths of light were used to measure the coating state of the prepared coating solution by visually dividing into upper / middle / lower portions.

[Experimental Example 2]

The electrostatic chargeability of the films prepared in Examples 1 to 2 and Comparative Examples 1 to 4 was measured. The measurement film was allowed to stand for 24 hours under conditions of 23 ° C and a relative humidity of 50%, and the surface resistance was measured by applying a voltage of 500 V using a model R-503, a surface resistance meter of Kawaguchi Co.,

[Experimental Example 3]

In the above Examples 1 to 2 and Comparative Examples 1 to 4, the film prepared in water at 90 캜 was immersed for 10 minutes, and the measurement film was dried using a dryer. Using a model R-503 manufactured by Kawaguchi Co., The surface resistance was measured.

[Experimental Example 4]

The optical properties of the coating solutions used in the films prepared in Examples 1 to 2 and Comparative Examples 1 to 4 were measured. The optical properties were measured by dividing the total transmittance and Hz by a method commonly used in the art.

[Experimental Example 5]

The pencil hardness of the films prepared in Examples 1 to 2 and Comparative Examples 1 to 4 was measured. The surface pencil hardness of the film obtained above was measured using a pencil scratch tester for a coating film (manual type) manufactured by Imoto Seisakusho Co., Ltd. according to JIS K 5600-5-4 (1999 edition). The measured surface pencil hardness is shown in Table 1.

The results of Experimental Examples 1 to 5 are shown in Table 1 below.

[Table 1]

division PET thickness
(탆) Coating Appearance
(Upper / middle / lower) Electrostatic chargeability
(Ω / ㎡) Water resistance
Electrostatic chargeability
(Ω / ㎡) Optical property
(TT / Hz) Pencil hardness Example 1 188 Prize 10 ¹⁰ 10 ¹¹ 91.1 / 0.8 H Example 2 250 Prize 10 ¹⁰ 10 ¹¹ 90.6 / 0.9 H Comparative Example 1 250 Prize 10 ¹⁴ 10 ¹⁴ 90.2 / 0.6 H Comparative Example 2 250 Prize 10 ⁹ 10 ¹⁰ 90.9 / 0.8 B Comparative Example 3 250 slander 10 ¹¹ 10 ¹² 89.6 / 0.6 H-2H Comparative Example 4 250 slander 10 ⁸ 10 ⁹ 88.6 / 1.2 B

As can be seen from the above Table 1, the examples show that the electrostatic chargeability and water resistance as well as the appearance and adhesion of the coating to the substrate and the electrostatic charging property, the pencil hardness and the optical characteristics after the test are superior to the comparative examples Able to know.

However, in Comparative Example 1, the appearance is good but the electrostatic chargeability is poor. In Comparative Example 2, the electrostatic chargeability is good, but the pencil hardness is poor. In the case of Comparative Examples 3 and 4, when the surface of the PET substrate was observed after coating, defective appearance of the coating occurred in the form of stain and the product could not be applied.

Therefore, the antistatic polyester adhesive film excellent in water resistance and surface hardness according to the present invention maintains the charging performance in an environment of high humidity as well as a sufficient adhesion between the primer layer and the substrate film, and has high optical properties and scratch resistance And excellent appearance characteristics. Further, the present invention can increase the product yield by increasing the adhesion with resins used for post-processing such as prism lens processing, hard coat processing, AR processing, etc., In particular, the optical film is useful as a base film for a prism sheet used for an LCD, a base film for a backlight, a base film for hard coating, an AR film, and a protective film for a CRT.

1 is a cross-sectional view of an antistatic polyester adhesive film excellent in water resistance and surface hardness according to the present invention.

2 is a chemical formula of the copolymerization antistatic agent of the acrylic monomer and the quaternary ammonium salt used in the present invention.

Fig. 3 is a conceptual diagram showing the combination of the block isocyanate and the thermosensitive resin.

Claims (5)

An optical biaxially oriented polyester adhesive film having a primer layer having excellent water resistance and surface hardness, As the base film, a biaxially oriented polyester film having a thickness of 50 to 300 占 퐉, Wherein the surface of the primer layer has an electrostatic chargeability of 10 ¹⁰ ? / M 2 or less and a static electrification property after 10 minutes water resistance test at 90 占 폚 water is 10 ¹¹ > / m < 2 >, the primer layer has a pencil hardness of not less than 1H, and the primer layer contains 88.0 wt% of water, 3.0 wt% of an antistatic resin containing 30.0 wt% of a copolymerization antistatic resin of an acrylic monomer and a quaternary ammonium salt 3.0% by weight of a thermally reactive water-soluble urethane resin aqueous dispersion containing 1.0% by weight of a curing agent containing 30.0% by weight of a polyethyleneimine curing agent and 20.0% by weight of a thermally reactive water-soluble urethane resin, 10.0% by weight of a tin- 1.0% by weight of a tin catalyst aqueous dispersion, 2.0% by weight of a pH adjusting agent, silica particles or alumina-silica composite oxide particles containing 70.0% by weight of alumina- , And 1.0 wt% of an anionic surfactant aqueous dispersion containing 1.0 wt% of an anionic surfactant aqueous dispersion and 1.0 wt% of an anionic surfactant aqueous dispersion containing an anionic surfactant of 10.0 wt%, and then dispersed and then applied with a coating liquid. An antistatic polyester adhesive film excellent in hardness. delete The method according to claim 1, Wherein the surface of the base film on which the primer layer is formed has a total light transmittance of 90% or more and a haze value of 0.4 to 1.0%. The method according to claim 1, Wherein the adhesive force between the base film and the primer layer is 100% after a wet test in 96 hours at 65 캜 and 95% humidity, and is excellent in water resistance and surface hardness. The method according to any one of claims 1, 3, and 4, Wherein the primer layer is applied after uniaxial stretching of the biaxially oriented polyester base film.

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