KR20070003246A - Antistatic water-dispersible coating solution and antistatic polyester film using the same - Google Patents

Abstract

Provided are an antistatic water-dispersible coating solution whose antistatic property is maintained for a long time, and an antistatic polyester film coated with the coating solution which is excellent in adhesion and heat resistance. The antistatic water-dispersible coating solution comprises an antistatic composition which comprises 100 parts by weight of an acrylic water-dispersible emulsion binder resin, 20-500 parts by weight of a cationic polymer antistatic agent represented by the formula 1, and 10-200 parts by weight of an inorganic fine particle; and water, wherein R1 is a C1-C4 alkyl group; R2 or R3 is a C1-C8 alkyl group; X is a halogen atom, a dialkyl halide ether group or an alkyl sulfonate group; and the alkyl group is a C1-C4 alkyl group.

Description

Antistatic water dispersion coating liquid and antistatic polyester film manufactured using same {ANTISTATIC WATER-DISPERSIBLE COATING SOLUTION AND ANTISTATIC POLYESTER FILM USING THE SAME}

The present invention relates to an antistatic water dispersion coating solution and an antistatic polyester film prepared by using the same, and more particularly, an electric charge containing simultaneously urea copolymer type cationic polymer type antistatic agent and inorganic fine particles of layered silicate mineral compound. It relates to an anti-water dispersion coating solution and an antistatic polyester film prepared by applying it to one or both sides of the polyester film.

In general, polyester film has high mechanical properties, high heat resistance, high transparency, and chemical resistance, and thus has many applications such as photographing, drawing, overhead projector (OHP), electrical and electronic parts, general industry, packaging, etc. It is used in the field.

However, such a polyester film has a problem that the surface resistance is large and is easily charged by friction. When the polyester film is charged, impurities or dust easily adhere to the surface of the film, and discharge occurs in the manufacturing process of the film or the processing of the film, thereby exposing the risk of ignition when the process using the organic solvent is performed. In particular, when the polyester film is used as a material for electrical and electronic components, static electricity is a major cause of breakage, and therefore, it is essential to impart antistatic performance to this field.

In order to prevent problems of the polyester film as described above, the internal addition method using an anionic compound such as organic sulfonate and organic phosphate, a method of depositing a metal compound, a method of applying conductive inorganic particles and a low molecular type anionic or Methods of applying cationic compounds are known.

However, among the above methods, the internal addition method has the advantages of low cost, excellent change over time and stability, but disadvantages that hinder the inherent properties of the film support, limitation of antistatic effect, film and lamination due to blooming. There is a problem such as deterioration in adhesion between them, and the method of depositing a metal compound on the surface is excellent in antistatic property and has been widely used for 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 a very good antistatic effect and is advantageous in terms of manufacturing cost, but is widely applied, but there is an antistatic limit, so it is approximately 10 ⁹ Ω / sq (Ω / square). The surface resistance below cannot 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 deteriorated, the solvent resistance is very bad, and transfer to the other side. The disadvantages of the possibilities limit the application greatly. In particular, some of the antistatic agent is moved to the interface after the passage of time, and most of the initial performance is excellent, but there is a disadvantage that the antistatic effect is degraded over time due to poor sustainability.

As an example of a known technology imparting an antistatic effect, a plastic base film (PET film) and a quaternary ammonium salt formed on one side of the film in Korean Patent No. 2000-14744, particularly preferably a polymeric quaternary ammonium salt An antistatic adhesive sheet composed of an antistatic layer, an adhesive layer (acrylic adhesive layer) formed on an antistatic layer, and a printing two layer and a scratch resistant coating layer formed on the opposite side of the adhesive layer of a plastic base film are described.

In addition, Japanese Mitsubishi Chemical Polyester Film Co., Ltd. uses acrylic resin and polyvinyl alcohol as a binder to increase adhesion to the substrate by using polydiaryldimethylammonium chloride as an antistatic agent in Korean Patent No. 2002-54251 and melamine Resin was used as a hardening | curing agent, and the antistatic polyester film was disclosed.

In addition, Korean Patent No. 2002-7013227 discloses an antistatic coating composition in which 50 to 400 parts by weight of conductive fine particles having a particle diameter of 10 to 30 nm and 10 to 80 parts by weight of a silicone compound are combined with 100 parts by weight of polyfunctional acrylate. Korean Patent No. 2001-46198 discloses an antireflection film provided with a low reflection layer by applying and curing a silicon compound containing a cationic modified silicon compound composed of a quaternary ammonium salt to a transparent substrate.

Generally, as a means for imparting antistatic properties, polyvinyl benzyl type, poly (meth) acrylate type styrene- (meth) acrylate copolymer type, styrene-maleimide copolymer type, methacrylate methacrylimide copolymerization Cationic or anionic polymeric antistatic agents such as body shapes are used, but polyester films prepared using such polymeric antistatic agents still do not yield satisfactory results in antistatic properties, heat resistance and durability.

Accordingly, the present inventors endeavored to provide an antistatic property to the polyester film, as a result, by mixing the antistatic composition consisting of an inorganic water-based emulsion binder resin, an urea copolymer type antistatic agent and inorganic fine particles of the layered silicate mineral compound with water It provides an antistatic water dispersion coating liquid, and by applying the coating liquid to one or both sides of the polyester film to form an antistatic agent layer, it provides excellent antistatic properties and further maintains the initial antistatic properties even after a long time By confirming, the present invention was completed.

It is an object of the present invention to provide an antistatic water dispersion coating liquid.

Another object of the present invention is to provide an antistatic polyester film prepared by applying the antistatic water dispersion coating solution to one or both sides of the polyester film.

In order to achieve the above object, the present invention is antistatic by mixing 20 to 500 parts by weight of the cationic polymer type antistatic agent and 10 to 200 parts by weight of the inorganic fine particles represented by the following formula (1) to 100 parts by weight of the acrylic water-based emulsion binder resin To prepare a composition, it provides an antistatic water dispersion coating liquid prepared by mixing the antistatic composition and water.

Formula 1

(Which is in the above, R ₁ is an alkyl group of C ₁ ~C _4, R ₂ or R ₃ is an alkyl group of C ₁ ~C _8, X is a halogen atom, a dialkyl ether or an alkyl halide selected from sulfonate one, and said alkyl is an alkyl group of C ₁ ~C _4.)

The antistatic water dispersion coating solution in the above contains 0.2 to 30% by weight of the antistatic composition.

In addition, the antistatic water dispersion coating liquid may further contain 0.2 to 25 parts by weight of the nonionic surfactant or the cationic surfactant relative to 100 parts by weight of the cationic polymer type antistatic agent.

In the above, the weight average molecular weight of the cationic antistatic agent is 1,000 to 500,000, and more preferred cationic antistatic agent is bis (2-chloroethyl) ether-1,3-bis [3- (dimethylamino) propyl] urea air Using coalescence.

The inorganic fine particles in the antistatic aqueous dispersion coating liquid may be used as one or more selected from the group consisting of silica tetrahedron sheets and alumina or magnesium octahedral sheets as layered silicate mineral compounds.

The present invention is applied to the antistatic water dispersion coating liquid prepared by mixing 0.2 to 30% by weight of the antistatic composition with water on one or both sides of the plastic base film, to provide an antistatic polyester film.

The polyester film is prepared by applying the antistatic water dispersion coating solution after the stretching process or the heat treatment process after stretching the polyester film.

Hereinafter, the present invention will be described in detail.

The present invention is prepared by mixing 20 to 500 parts by weight of the cationic polymer type antistatic agent and 10 to 200 parts by weight of the inorganic fine particles represented by the following formula (1) to 100 parts by weight of the acrylic water-based emulsion binder binder resin, the antistatic composition It provides an antistatic water dispersion coating liquid prepared by mixing the composition and water.

Formula 1

(In the above, R ₁ , R ₂ and R ₃ are as defined above.)

The antistatic water dispersion coating solution is prepared by mixing 20 to 500 parts by weight of the cationic polymer type antistatic agent and 10 to 200 parts by weight of the inorganic fine particles represented by Formula 1 to 100 parts by weight of the acrylic water dispersion emulsion binder resin, to prepare an antistatic composition, It is prepared by mixing 0.2-30% by weight of the antistatic composition with water. More preferably, it is 0.2-20 weight%, More preferably, it is 0.5-15 weight%, Most preferably, it contains 1-10 weight%. At this time, if the solid content concentration in the antistatic water dispersion coating liquid is less than 0.2% by weight, there is a problem in the uniformity on the coating surface due to coating repulsion, when the solid content concentration exceeds 30% by weight, the coating liquid viscosity is increased and the appearance of coating Worsens.

The cationic polymer antistatic agent of the present invention is a urea copolymer type, which maintains moisture contained in the air by the amine unit incorporated in the amino alkyl urea copolymer, and serves to lower the electrical resistance by X ionizing to impart electrical conductivity. To impart antistatic properties. More preferably, bis (2-chloroethyl) ether-1,3-bis [3- (dimethylamino) propyl] urea copolymer is used as the cationic antistatic agent of the present invention.

In addition, the cationic antistatic agent of the present invention preferably has a weight average molecular weight of 1,000 to 500,000, more preferably those having a weight average molecular weight of 3,000 to 100,000, especially 3,000 to 30,000.

At this time, if the weight average molecular weight of the cationic polymer type antistatic agent is less than 1,000, since its molecular weight is too small, it may fall on the film formation ability and the polymer may decompose | decompose from the high temperature added in the extending process of a polyester film. On the other hand, if the weight average molecular weight exceeds 500,000, the self-viscosity of the antistatic copolymer is too high, resulting in poor operability, coating properties, etc. due to excessive increase in viscosity during the preparation of the dispersion, emulsion or solution of the copolymer.

In preparing the antistatic water dispersion coating solution of the present invention, the cationic polymer type antistatic agent is used in an amount of 20 to 500 parts by weight based on 100 parts by weight of the acrylic water dispersion emulsion binder resin. At this time, if the content is too low, less than 20 parts by weight, it is difficult to achieve sufficient surface resistance, and if the content of the cationic polymer type antistatic agent is excessively higher than 500 parts by weight, the viscosity of the aqueous dispersion is increased to reduce the coating property As a result, sufficient effects cannot be obtained in terms of durability and solvent resistance.

In addition, the inorganic fine particles of the present invention are present in the gallery attracted by the net negative charge on the clay surface, and have at least one naturally occurring cation or a cation of an alkali metal such as potassium, calcium, and sodium, and contains a small amount of water. It is possible to conduct the static electricity accumulated on the surface by external or friction. Therefore, the inorganic fine particles of the present invention, due to the natural moisture content and internal charge of about 10%, it is possible to maintain the excellent antistatic properties by maintaining a sufficient surface resistance after the formed antistatic layer over time.

More specifically, the inorganic fine particles of the present invention are layered silicate mineral compounds represented by the following formula (2).

는 산소이고,

는 하이드록시,

는 알루미늄이고,

는 실리콘이고,

은 마그네슘 또는 철이다.)(Wherein A is a water layer (nH ₂ O) as an exchangeable cation,

Is oxygen,

Hydroxy,

Is aluminum,

Is silicone,

Is magnesium or iron.)

More specifically, the inorganic fine particles use at least one member selected from the group consisting of a silica tetrahedron sheet and an aluminum or magnesium octahedron sheet.

The layered silicate minerals can be purchased and used commercially available, such as Charlotte, LAPONITE, Megadite from Laporte Industries, Ltd., North Carolina. And fluorohectorite, KUNIPIA and SUMECTON manufactured by Kunimine Industries, Ltd.

In preparing the antistatic water dispersion coating solution of the present invention, the inorganic fine particles may be used in an amount of 10 to 200 parts by weight based on 100 parts by weight of the acrylic aqueous dispersion emulsion binder resin. At this time, if the content of the inorganic fine particles is less than 10 parts by weight, the amount is too low, it is difficult to maintain sufficient surface resistance even after time, while the content of the inorganic fine particles exceeds 200 parts by weight, If the amount of use is excessively high, the viscosity of the water-dispersion coating solution may be high, which may lower the coating property and damage the transparency of the film.

In addition, in order to improve the adhesion between the antistatic water dispersion coating liquid of the present invention and the polyester film, a binder is used.

At this time, the acrylic water-based emulsion binder resin is methyl acrylate, ethyl acrylate, n-butyl acrylate, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, 2-hydroxy ethyl meth as a monomer during emulsion polymerization. Any one selected from the group consisting of acrylate, hydroxy propyl acrylate, acrylamide, glycidyl methacrylate, styrene and vinyl acetate is used. In addition, acrylic acid, methacrylic acid, itaconic acid and other initiators, emulsifiers and the like may be added according to conventional techniques.

The antistatic water dispersion coating solution may further add a nonionic surfactant or cationic surfactant in order to improve the coating properties of the plastic base film. In this case, the amount of the surfactant used is 0.2 to 25 parts by weight, more preferably 0.2 to 20 parts by weight based on 100 parts by weight of the cationic polymer type antistatic agent.

In order to improve the solvent resistance of the applied antistatic layer, the antistatic water dispersion coating liquid of the present invention is a methylolated or alkoxymethylated melamine compound, urea compound, epoxy compound, isocyanate compound, carbodiimide compound, oxazoline At least one crosslinking agent selected from the group consisting of a compound and a silane coupling agent compound may be further contained.

In addition, the antistatic water dispersion coating liquid is preferably an aqueous coating liquid consisting of a water-soluble resin or a water dispersible resin using water as a medium, but an aqueous coating liquid containing a small amount of an organic solvent may be used. By suitably selecting and containing the said organic solvent, the stability, applicability | paintability, or coating-film characteristic of a coating liquid can be improved. At this time, the organic solvent may be an alcohol such as ethanol, isopropanol, ethylene glycol, glycerin; Ethers such as ethyl cellosolve, t -butyl cellosolve, propylene glycol monomer methyl ether and tetrahydrofuran; Ketones such as acetone and methyl ethyl ketone; Esters such as ethyl acetate; And amines such as dimethylethanolamine alone or two or more thereof can be used.

In addition, the present invention is antistatic for one or both sides of the plastic base film, consisting of 100 parts by weight of the acrylic water-based emulsion emulsion binder resin, 20 to 500 parts by weight of the cationic polymer type antistatic agent represented by the formula (1) and 10 to 200 parts by weight of inorganic fine particles An antistatic water dispersion coating liquid prepared by mixing 0.2 to 30% by weight of the composition with water is applied to provide an antistatic polyester film.

More specifically, the antistatic water dispersion coating solution may be applied onto one or both sides of the plastic base film during the stretching process or after the heat treatment process after stretching to obtain an antistatic polyester film.

5-250 micrometers is preferable and, as for the thickness of the manufactured polyester film, More preferably, it is 10-188 micrometers.

The plastic base film can be used in the known ones that are conventionally used as a base film in the antistatic coating, representative examples thereof include polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate and polyethylene-2, Polyester resin consisting of 6-naphthalenedicarboxylate (PEN) is used. In particular, the embodiment of the present invention has been described based on polyethylene terephthalate, but is not limited thereto.

The antistatic polyester film is prepared by applying an antistatic water dispersion coating liquid after the stretching process or the heat treatment process after stretching the polyester film.

In this case, the coating method may be a coating method using a roll such as a gravure roll or reverse gravure roll, a coating method using a mayer bar, or an application method using an air knife. Corona discharge treatment may be performed prior to coating to increase polar group introduction and surface tension in the film surface to favor coating properties of the composition, and to improve adhesion between the composition and the polyester resin.

When manufacturing a polyester film, the present invention, when considering its handleability, silica, talc, calcium carbonate, alumina, silica alumina, titanium oxide, zeolite, polystyrene, silicon dioxide, calcium carbonate, dioxide under conditions that do not impair transparency Two or more kinds of inorganic or organic particles selected from the group consisting of titanium, lithium fluoride, barium sulfate and carbon black can be added. At this time, the inorganic or organic particles may be added by a known method at any stage of the polyester manufacturing process. In particular, it is preferable to proceed with the polycondensation reaction by adding a slurry dispersed in ethylene glycol or the like in the step of esterification or after the end of the transesterification reaction before the start of the polycondensation reaction.

In terms of transparency, the smaller the amount of the inorganic or organic particles is, the more the amount depends on the particle size. That is, the average particle diameter of the said inorganic or organic particle | grain is 0.02-2 micrometers, More preferably, it is 0.05-1.5 micrometers, Most preferably, it is 0.05-1 micrometer. At this time, the amount added is preferably 5,000ppm or less, more preferably 3,000ppm or less. In addition, additives, UV absorbers, stabilizers or pigments may be added as long as the intrinsic properties of the polymer are not affected.

The polyester film is manufactured according to an extrusion method in which the polyester is melt-extruded from the extrusion port, cooled and solidified by a cooling roll to obtain an unstretched sheet, and then the sheet melt-extruded from the extrusion port is stretched in the biaxial direction in the longitudinal and transverse directions. Can be oriented.

In order to improve the planarity of the obtained non-stretched sheet, it is necessary to improve the adhesion between the sheet and the rotary cooling drum. Therefore, the electrostatic application adhesion method or the liquid coating adhesion method is preferable, and more preferably, the electrostatic application adhesion method is performed.

In the electrostatically applied adhesion method, a linear electrode is disposed on the upper surface side of the sheet in a direction that is directly parallel to the flow of the sheet, and a static voltage is applied to the sheet by applying a DC voltage of about 5 to 10 kW to the electrode, thereby providing a sheet and a drum. It is a method of improving the adhesiveness of the. In addition, the liquid coating adhesion method is a method of improving the adhesion between the drum and the sheet by uniformly applying the liquid only to all or part of the surface of the rotary cooling drum (that is, the portion in contact with both ends of the sheet).

Thereafter, the biaxial stretching orientation method of the polyester film is not particularly limited, but is carried out by a simultaneous biaxial stretching method or a sequential biaxial stretching method. Simultaneous biaxial stretching method is a method of stretching and orienting the unstretched sheet simultaneously in the machine direction and the width direction at a controlled temperature condition of 70 to 120 ° C, preferably 80 to 110 ° C. Usually 4-50 times, Preferably it is 7-35 times, More preferably, it is 10-20 times. Subsequently, it can continuously heat-process under tension conditions or the relaxation conditions within 30% at the temperature of 170-250 degreeC, and a stretched orientation film can be obtained.

Moreover, the sequential biaxial stretching method extends | stretches the said unstretched sheet by the stretching machine of a roll or a tenter system to 1 direction, extending | stretching temperature is 70-120 degreeC, More preferably, it is 80-110 degreeC, and draw ratio is normally 2.5-7 times, More preferably, it is 3.0-6 times. Thereafter, the film is drawn in a direction orthogonal to the drawing direction in one step, and at this time, the drawing temperature is 70 to 120 ° C, more preferably 80 to 115 ° C, and the draw ratio is 3.0 to 7 times, more preferably 3.5 to 6 It is a ship. Subsequently, it can be heat-treated continuously under tension conditions or within 30% of relaxation conditions at the temperature of 170-250 degreeC, and a stretched orientation film can be obtained.

Moreover, in the said extending process, the method of making extending | stretching of 1 direction into two or more steps can be used. In this case, it is preferable to make the draw ratio of two directions finally become the said range, and you may extend in a vertical and / or a horizontal direction again before or after heat processing as needed.

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>

1. Preparation of antistatic waterborne coating liquid

Into the pure water passed through the ion exchange resin, laponite (product of Laporte Industries), an inorganic fine particle having surfactant and antistatic properties, was uniformly stirred to form a nanosol, and then bis (2-chloroethyl) ether-1 After adding the cationic polymer type antistatic agent of the, 3-bis [3- (dimethylamino) propyl] urea copolymer and stirring well, the acrylic water-based emulsion resin (Romend Haas, Hexamethoxymethylmelamine crosslinking agent) One-component product) was added and then mixed uniformly to prepare an antistatic dispersion solution.

At this time, the composition is 100 parts by weight of acrylic water-based emulsion resin, 100 parts by weight of cationic polymer antistatic agent, 100 parts by weight of laponite as inorganic fine particles and 2.5 parts by weight of polyoxyethylene nonylphenyl ether (manufactured by Nippon Oil Holding Co., Ltd.) as a surfactant. In the pure water passed through the ion exchange resin, the composition contained 3.025% by weight as a total solids content.

2. Preparation and Coating of Polyester Film Substrate

Polyethylene terephthalate pellets having an ultimate viscosity of 0.62㎗ / g containing 60 ppm of porous amorphous spherical silica particles having an average particle diameter of 3.7 µm were sufficiently dried at 160 ° C. for 7 hours using a vacuum dryer, and then melted and cooled through an extrusion die. Close contact with the electrostatic application method to form an amorphous non-stretched sheet, which was heated again to perform 3.5 times stretching in the direction of the film run at 100 ℃. Then, after the corona discharge treatment on the surface of the film to be applied, the antistatic dispersion coating solution prepared in step 1 using the Meyer bar coating method was applied. Thereafter, the film was stretched 3.5 times in the direction perpendicular to the advancing direction of the film at 105 to 140 ° C. tenter section, and then heat-treated at 240 ° C. for 4 seconds to obtain a 25 μm thick film.

<Example 2>

In the antistatic composition, 200 parts by weight of a cationic polymer type antistatic agent was carried out in the same manner as in Example 1, except that the composition contained 4.025% by weight as a total solids content in pure water passed through an ion exchange resin. It was.

Comparative Example 1

In the antistatic composition, the same process as in Example 1 was carried out except that the composition contained 2.025% by weight as a total solid content in pure water passed through an ion exchange resin without using a cationic polymer type antistatic agent. .

Comparative Example 2

In the antistatic composition, the same procedure as in Example 1 was carried out except that the composition contained 2.025% by weight of the total solid content in pure water that passed through the ion exchange resin without using laponite as the inorganic fine particles. .

Comparative Example 3

In the antistatic composition, the above-mentioned embodiment, except that the composition contains 1.025% by weight of the total solid content in pure water passed through the ion exchange resin, without using laponite as a cationic polymer type antistatic agent and inorganic fine particles, Same as 1 was performed.

<Comparative Example 4>

In the antistatic composition, 100 parts by weight of polydiaryldimethylammonium chloride (produced by Rhodia Co., Ltd.) was used as the cationic antistatic agent, and the same procedure as in Example 1 was carried out except that laponite was not used as the inorganic fine particles. It was.

Comparative Example 5

In the antistatic composition, 100 parts by weight of sulfonate polystyrene (manufactured by National Starch Co., Ltd.) was used as the cationic antistatic agent, and the same procedure as in Example 1 was performed except that laponite was not used as the inorganic fine particles. .

Comparative Example 6

In the antistatic composition, 200 parts by weight of a quaternary ammonium salt (manufactured by Nippon Kayaku Co., Ltd.) was used as the cationic antistatic agent, and the same procedure as in Example 1 was performed except that laponite was not used as the inorganic fine particles.

Experimental Example

Evaluation of the properties of the polyester film prepared in Examples 1 to 2 and Comparative Examples 1 to 6 was performed based on the following criteria.

1. Surface Resistance

After leaving the polyester films prepared in Examples 1 to 2 and Comparative Examples 1 to 6 for 8 hours under 25 ° C. × 55 RH% conditions, antistatic properties were evaluated by a surface resistance measuring instrument (ADVANTEST, manufactured by Advantest Japan). It was. The unit is Ω / square.

2. Surface resistance retention after time

After allowing the polyester films of Examples 1 to 2 and Comparative Examples 1 to 6 to be applied for the first time to stand at room temperature for 90 days, the surface resistance of the film was measured to determine the degree of difference with the surface resistance before the passage of time. .

○: 1 × 10 ¹ or less (excellent)

△: more than 1 × 10 ¹ to 1 × 10 ² or less (usually)

×: 1 × 10 ² or more (bad)

3. Heat resistance

After heat-treating the polyester films prepared in Examples 1 to 2 and Comparative Examples 1 to 6 at 230 ° C. for 10 minutes in the hot air dryer, the surface resistance of the film was measured to determine the degree of difference with the surface resistance before the heat treatment. It was.

○: 1 × 10 ¹ or less (excellent)

△: more than 1 × 10 ¹ to 1 × 10 ² or less (usually)

×: 1 × 10 ² or more (bad)

4. Coating Uniformity

The external appearance state of the apply | coated film was visually observed, and the grade apply | coated uniformly was determined.

○: uniform coating

×: coating state is uneven

5. Lacquer Adhesion

An oily type evaluation lacquer comprising 10 parts by weight of n-butanol, 250 parts by weight of methyl cellosolve, 10 parts by weight of methyl ethyl ketone, 25 parts by weight of cellulose acetate butyrate, and 3 parts by weight of rhodamine ratio (dye) was carried out. After applying with wire bar # 18 on the polyester film samples prepared in Examples 1 to 2 and Comparative Examples 1 to 6, and sufficiently drying for 1 minute at 105 ° C. in a dryer, 100 scales were applied to the surface using a cross cutter. Then, the adhesive tape was stuck and it peeled. At this time, the evaluation was made based on the number of remaining scales which did not peel out of 100 scales.

100: no peeling at all (excellent)

0: All peeled off (defect)

From the results of Table 1, the polyester film of the present invention prepared in Examples 1 and 2 and Comparative Examples 1 to 6 confirmed a surface resistance of 10 ⁹ Ω / sq (Ω / square) or less, the low surface resistance The excellent antistatic property was confirmed from the value. In addition, the surface resistance value was confirmed to maintain the initial antistatic property by showing a difference of 1 × 10 ¹ or less even after 90 days at room temperature. In addition, the polyester film of the present invention satisfies the characteristics of heat resistance, coating uniformity and lacquer adhesion.

As described above, the present invention

First, there was provided an antistatic water dispersion coating liquid prepared by mixing an antistatic composition containing a cationic copolymer type antistatic agent and inorganic fine particles having antistatic properties at the same time with water,

Second, by applying the antistatic water dispersion coating solution on the polyester film, the excellent antistatic properties are maintained even after a long time, thereby providing a polyester film excellent in adhesion and heat resistance without adhesion of foreign matter or dust.

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

Claims (9)

To 100 parts by weight of the acrylic water-based emulsion binder resin, 20 to 500 parts by weight of a cationic polymer type antistatic agent and 10 to 200 parts by weight of inorganic fine particles represented by the following formula (1) were mixed to prepare an antistatic composition, and the antistatic composition and water Antistatic waterborne coating liquid, characterized in that the mixture was prepared. Formula 1

(Which is in the above, R ₁ is an alkyl group of C ₁ ~C _4, R ₂ or R ₃ is an alkyl group of C ₁ ~C _8, X is a halogen atom, a dialkyl ether or an alkyl halide selected from sulfonate one, and said alkyl is an alkyl group of C ₁ ~C _4.) The antistatic water dispersion coating liquid according to claim 1, wherein the antistatic water dispersion coating liquid contains 0.2 to 30% by weight of an antistatic composition. The antistatic water according to claim 1, wherein the antistatic water dispersion coating solution further contains 0.2 to 25 parts by weight of a nonionic surfactant or a cationic surfactant based on 100 parts by weight of a cationic polymer type antistatic agent. Dispersion coating solution. The antistatic aqueous dispersion coating solution according to claim 1, wherein the cationic antistatic agent is bis (2-chloroethyl) ether-1,3-bis [3- (dimethylamino) propyl] urea copolymer. The antistatic water dispersion coating liquid according to claim 1, wherein the cationic antistatic agent has a weight average molecular weight of 1,000 to 500,000. The antistatic water dispersion coating liquid according to claim 1, wherein the inorganic fine particles are a layered silicate mineral compound. The antistatic aqueous dispersion coating liquid according to claim 1, wherein the inorganic fine particles are at least one member selected from the group consisting of a silica tetrahedron sheet and an alumina or magnesium octahedron sheet. On one or both sides of the plastic base film 0.2 to 30% by weight of the antistatic composition of claim 1, consisting of 20 to 500 parts by weight of the cationic polymer type antistatic agent and 10 to 200 parts by weight of the inorganic fine particles represented by the formula (1), is mixed with 100 parts by weight of the acrylic water-dispersible emulsion binder resin. To prepare an antistatic water dispersion coating solution, the antistatic polyester film, characterized in that prepared by applying the antistatic water dispersion coating solution. The antistatic polyester film of claim 8, wherein the antistatic polyester film is prepared by applying the antistatic water dispersion coating solution after the stretching process or the heat treatment process after the stretching of the polyester film.