JPH05320390A - Antistatic easily adhesive polyester film and its production - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to obtain a biaxially stretched polyester film excellent in transparency, antistatic property, and easy adhesion. [Structure] The present invention comprises at least a water-soluble or water-dispersible polyester copolymer (A), a conductive polymer (B) having a compound represented by the following general formula [I], and polyglycerin (C). And a polyester film having at least one layer containing the composition, and a method for producing the same. [Chemical 10] [In the formula, M represents H ⁺ or NH ₄ ⁺ . ]

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic and easily adhering polyester film which is particularly excellent in transparency and antistatic property, and a method for producing the same.

[0002]

BACKGROUND OF THE INVENTION Biaxially stretched polyethylene terephthalate film typified by polyester film is characterized by excellent transparency, dimensional stability, mechanical properties, electrical properties, chemical resistance, etc. It is used in various fields as a base film for insulating materials and photographic photosensitive materials. However, when used as a base material for a photographic light-sensitive material, since the base material itself is an electrical insulator, accumulation of electric charges due to static electricity is remarkable, which is a problem in photographic performance. Therefore, conventionally, the surface of the polyester film has been provided with antistatic properties by various methods. For example, a method of kneading metal powder, tin oxide-antimony-based conductive agent, anionic surfactant, polystyrene sulfonic acid, acrylic copolymer and sulfonated polystyrene, or a method of blending and coating in a coating agent, etc. Was taken.

Further, JP-A 64-9242 or JP-A 1-2871
No. 42 discloses a technique of obtaining transparency and antistatic property by using polystyrene sulfonic acid as an antistatic agent and performing a stretching step in pressurized water or in the presence of pressurized steam. However, according to this method, the process control which is dangerous in terms of work is complicated and it is not preferable in practice. Therefore, there has been a demand for a technique capable of obtaining a film having excellent transparency and antistatic properties by a normal stretching process.

Further, there is known a technique in which a polyester film having a polymer having a sulfonated polystyrene and / or a salt thereof and a polymer made of an acrylic copolymer is coated on the polyester film. However, it was still insufficient in terms of transparency and antistatic property.

Further, the one in which polystyrene sulfonic acid or a salt thereof is kneaded has a poor affinity with polyester, so that the interface is peeled off by stretching and the transparency is lowered, and when applied, cracks are formed in the coating film by stretching. However, there is a problem in that the transparency and the antistatic property deteriorate.

When metal powder or a tin oxide-antimony type conductive agent was used, the antistatic effect was excellent, but the transparency was insufficient. Also, when an antistatic agent such as an anionic surfactant is kneaded or blended in the coating agent and applied, the antistatic agent bleeds out on the surface or interface and causes migration over time, resulting in cloudiness on the surface. However, there are drawbacks such as a decrease in transparency and a decrease in adhesion to a base film and adhesion to various binders. Further, when heat-treated at a high temperature, there was a defect that the antistatic property was impaired over time.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to overcome the above problems, and an object of the present invention is to provide transparency,
It is to provide a biaxially stretched polyester film having excellent antistatic properties and easy adhesion.

[0008]

The present invention provides at least the following:
Water-soluble or water-dispersible polyester copolymer (A),
This is achieved by a composition comprising a conductive polymer (B) having a compound represented by the following general formula [I] and polyglycerin (C).

[0009]

[Chemical 2] [In the formula, M represents H ⁺ or NH ₄ ⁺ . ]

The object of the present invention is also achieved by an antistatic and easily adhering polyester film having at least one layer containing the above composition on at least one side of the polyester film.

Another object of the present invention is to form a polyester film by laminating at least one layer containing the above composition on one side of a polyester film before completion of oriented crystals, and then further stretching it at least uniaxially to complete oriented crystallization. This is achieved by a method for producing an antistatic and easily adhesive polyester film, which is characterized in that

The water-soluble or water-dispersible polyester copolymer (A) used in the present invention can be obtained, for example, by a polycondensation reaction of a mixed dicarboxylic acid component and a glycol component.

The mixed dicarboxylic acid component is a dicarboxylic acid component having a sulfonate (a dicarboxylic acid having a sulfonate and / or an ester-forming derivative thereof) as a total dicarboxylic acid component in a water-soluble polyester copolymer. On the other hand, it is a dicarboxylic acid component containing 5 to 15 mol%.

As the dicarboxylic acid having a sulfonic acid salt and / or its ester-forming derivative used in the present invention, those having a group of an alkali metal salt of sulfonic acid are particularly preferable, for example, 4-sulfoisophthalic acid and 5-sulfoisophthalic acid. Acid, sulfoterephthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, 5
-Alkali metal salts such as [4-sulfophenoxy] isophthalic acid or ester-forming derivatives thereof are used,
Particularly preferred is 5-sulfoisophthalic acid sodium salt or its ester-forming derivative. From the viewpoint of water solubility and water resistance, it is particularly preferable that the dicarboxylic acid and / or its ester-forming derivative having a sulfonate is used in an amount of 6 to 10 mol% based on the total dicarboxylic acid component.

Other dicarboxylic acid components include aromatic dicarboxylic acid components (aromatic dicarboxylic acids and / or their ester-forming derivatives), alicyclic dicarboxylic acid components (alicyclic dicarboxylic acids and / or their ester-forming properties). Derivative), an aliphatic dicarboxylic acid component (aliphatic dicarboxylic acid and / or its ester-forming derivative), and the like.

The aromatic dicarboxylic acid component mainly includes a terephthalic acid component (terephthalic acid and / or its ester-forming derivative) and an isophthalic acid component (isophthalic acid and / or its ester-forming derivative).

In the present invention, the aromatic dicarboxylic acid component is preferably used in the range of 50 to 80 mol% with respect to the total dicarboxylic acid component, and the terephthalic acid component and the isophthalic acid component are in a molar ratio of 30. It is particularly preferably used in the range of / 70 to 70/30 from the viewpoint of coatability on a polyester film and solubility in water.

Specific aromatic dicarboxylic acid components include, for example, phthalic acid, 2,5-dimethylterephthalic acid, 2,
Examples thereof include aromatic dicarboxylic acids such as 6-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, and biphenyldicarboxylic acid, or ester-forming derivatives thereof.

Examples of the alicyclic dicarboxylic acid and / or its ester-forming derivative include 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,
2-Cyclohexanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 4,4′-bicyclohexyldicarboxylic acid and the like, or ester-forming derivatives thereof are used, but these are all dicarboxylic acids from the viewpoint of the aqueous solution viscosity of the resin. It is preferable to use 10 mol% or more of the components,
If the amount is too small, the above viscosity becomes high, which may cause problems in coating properties.

In the present invention, the linear aliphatic dicarboxylic acid and / or its ester-forming derivative may be used within the range of 15 mol% or less of the total dicarboxylic acid component. Examples of such dicarboxylic acid components include adipic acid,
Examples thereof include aliphatic dicarboxylic acids such as pimelic acid, speric acid, azelaic acid and sebacic acid, and ester-forming derivatives thereof. If the amount of the above linear aliphatic dicarboxylic acid component is too large, not only blocking tends to occur, but also the adhesion becomes poor in water resistance.

In the present invention, it is preferable to use ethylene glycol in an amount of 50 mol% or more based on the total glycol component from the viewpoint of mechanical properties of the polyester copolymer and adhesiveness with the polyester film. As the glycol component used in the present invention, in addition to ethylene glycol, 1,
4-butanediol, neopentyl glycol, 1,4
-Cyclohexanedimethanol, diethylene glycol, triethylene glycol, polyethylene glycol and the like may be used in combination.

The water-soluble polyester copolymer used in the present invention preferably has an intrinsic viscosity in the range of 0.25 to 0.55 dl / g. A particularly preferred range of intrinsic viscosity is 0.3 to 0.5
dl / g.

As a typical example of the conductive polymer (B) having the compound represented by the above general formula [I] used in the present invention, a polymer represented by the following general formula [II], or another monomer Examples include polymers copolymerized with the body.

[0024]

[Chemical 3] (In the formula, n represents an integer and M represents H ⁺ or NH ₄ ⁺ .)

As the other copolymerizable monomer, aromatic compounds such as styrene, α-methylstyrene, vinyltoluene and p-methylstyrene; methyl acrylate,
Ethyl acrylate, butyl acrylate, acrylic acid 2-
Acrylic acid or alkyl esters of methacrylic acid such as ethylhexyl, methyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacryl; mono or such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid Dicarboxylic acids or anhydrides of dicarboxylic acids; butadiene, isoprene, 2-chloro-1,3-butadiene, 1-chloro-
Aliphatic conjugated dienes such as 1,3-butadiene; vinyl cyanide compounds such as acrylonitrile and methacrylonitrile; vinyl chloride, vinylidene chloride, vinyl methyl ethyl ketone, vinyl methyl ether, vinyl acetate, vinyl formate, allyl acetate, methallyl acetate, acrylamide, Methacrylamide, N-methylolacrylamide, glycidyl acrylate, glycidyl methacrylate, acrolein, allyl alcohol and the like are used.

In the present invention, it is preferable that the copolymerizable monomer is contained in an amount of 10 to 50% by weight from the viewpoint of transparency and easy adhesion. The number average molecular weight of the conductive polymer used in the present invention is not particularly limited, but from the viewpoint of transparency of the coating film after biaxial stretching and easy adhesion, it is preferably in the range of 1,000 to 1,000,000, and further 5,000. It is preferably in the range of up to 100,000.

As the counter ion of the sulfonic acid in the general formula [I], it is preferable to use H ⁺ , NH ₄ ⁺ or the like from the viewpoint of antistatic property.

A crosslinking agent may be added to the composition of the present invention. Examples of the cross-linking agent used in the present invention include epoxy compounds, aziridine compounds, blocked isocyanate compounds, and block methylol compounds. In the present invention, epoxy compounds having two or more functional groups,
Blocked isocyanate compounds and aziridine compounds are preferred. The cross-linking agents may be mixed and used.

Specific examples of typical epoxy compounds used in the present invention are shown below, but the present invention is not limited thereto. C-1 sorbitol polyglycidyl ether C-2 sorbitan polyglycidyl ether C-3 polyglycerol polyglycidyl ether C-4 diglycerol polyglycidyl ether C-5 glycerol polyglycidyl ether C-6 ethylene glycol diglycidyl ether C-7 polyethylene glycol Diglycidyl ether C-8 Propylene glycol diglycidyl ether C-9 Polypropylene glycol diglycidyl ether As a commercial item, there is Denacol series (manufactured by Nagase Kasei Co., Ltd.), which is Denacol EX-614B, EX-6.
51A, EX-512, EX-521, EX-421, EX-313,
EX-830, EX-841, EX-861, EX-911, EX-
920 etc. can be mentioned.

In the present invention, two or more epoxy compounds may be used in combination.

The blocked isocyanate compound used in the present invention is preferably a bifunctional or higher functional compound, and commercially available products include Elastron series (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), which are trade names of Elastron H-3 and E-. 37, C
-9, F-29, H-38, W-11, MF-25, BN-08,
Examples thereof include BN-11, but the present invention is not limited thereto. In the present invention, two or more blocked isocyanate compounds may be used in combination. A reaction accelerating catalyst may be used to accelerate the reaction. Examples of the catalyst used include the trade name Elastron Catalyst 64 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and the like, but the present invention is not limited thereto.

The aziridine compound used in the present invention is preferably a bifunctional or higher functional compound, and particularly preferably a bifunctional or trifunctional functional compound having a molecular weight of 1,000 or lower.

Specific examples of typical aziridine compounds are shown below, but the present invention is not limited thereto.

[0034]

[Chemical 4] In the present invention, two or more aziridine compounds may be used in combination.

In the composition of the present invention, the above-mentioned water-soluble or water-dispersible polyester copolymer (A), the conductive polymer (B) of the present invention, and the crosslinking agent (D) are added to the polyester copolymer (A): conductive. Polymer (B): Crosslinking agent (D) = 90-30
%: 10 to 50% by weight: 0 to 20% by weight is preferable.

Polyglycerin (C) used in the present invention
Is preferably a compound represented by the following general formula [III].

[0037]

[Chemical 5] In the formula, n is an integer of 2 or more and 20 or less.

In the present invention, the amount of polyglycerin (C) used is such that the polyester copolymer (A): conductive polymer (B): crosslinking agent (D) = 70 to 20% by weight: 30 to 70% by weight: The content is preferably 0.01 to 50% by weight, and more preferably 5 to 40% by weight, based on the total solid content in the coating solution adjusted at a rate of 0 to 20% by weight. By incorporating polyglycerin into the coating agent as in the present invention, the coating solution can be kept stable without causing aggregation or gelation.

In the composition of the present invention, anionic surfactants, nonionic surfactants, aliphatic polyhydroxy compounds, sulfonation, carboxylation, phosphorylation, sulfoalkylene are included within the range that does not impair the effects of the present invention. A natural water-soluble polymer or the like, which is formed of a carboxylated, carboxylalkylenated, or alkylphosphorylated compound or a salt thereof, may be added, or these may be used in combination. The amount of the above compound added is as follows: polyester copolymer (A): conductive polymer (B): crosslinking agent (D) = 70 to 20% by weight: 30 to 70% by weight:
It is preferably in the range of 0 to 20% by weight based on the total solid content in the coating solution adjusted in the ratio of 0 to 20% by weight.

The antistatic and easily adhesive polyester film of the present invention comprises a layer containing the composition of the present invention on at least one surface of the polyester film (hereinafter referred to as "the undercoat layer of the present invention").
That is) at least one layer.

Examples of the polyester film used in the present invention include a polyethylene terephthalate film, a polybutylene terephthalate film, a polyethylene naphthalate film and the like. Among these, a polyethylene phthalate film is particularly preferable.

A matting agent or the like may be added to the undercoat layer coating solution used for the undercoat layer of the present invention (hereinafter referred to as "the undercoat layer coating solution of the present invention"). Water-soluble or water-dispersible polymers other than the polyester copolymer according to the present invention may be added within a range that does not impair the effects of the present invention.

The coating liquid for the undercoat layer of the present invention is applied to a polyester film by a conventional coating process, that is, a polyester film on which orientation and crystallization has been completed is separated from the manufacturing process of the film and the undercoat layer is formed in a separate process. There is also a method of applying a coating solution for use. Further, a method of applying the coating liquid for the undercoat layer in the polyester film manufacturing process is also preferable. In particular, at least one surface of the polyester film before completion of oriented crystallization in the film manufacturing process, the coating solution for the undercoat layer of the present invention is applied, dried, and then stretched in at least one direction, heat set, and cooled. Is preferably obtained by completing the oriented crystallization, as an example, after preheating the unstretched film obtained by cooling the polyester resin melt-extruded into a film form from a die on a cooling drum after vertical stretching of the present invention. A method of applying the coating liquid for the undercoat layer, drying it, preheating it further, stretching it horizontally, then heat fixing it and cooling it is carried out. Further, the polyester film may be subjected to a surface treatment such as corona discharge or glow discharge before being coated with the coating liquid for the undercoat layer of the present invention.

In the present invention, the polyester film before the completion of oriented crystallization means an unstretched film obtained by heat-melting a polyester polymer to form a film as it is, or this unstretched film in either the vertical or horizontal direction. It refers to a stretched uniaxially stretched film, and further to a vertically or horizontally biaxially stretched film, which is a biaxially stretched film before it is re-stretched in any one of the vertical and horizontal directions to complete the oriented crystallization. The above-mentioned vertical stretching and horizontal stretching are both usually 2.0 to
It is performed at a magnification of 5.0 times.

The concentration of the coating liquid for the undercoat layer of the present invention is usually
It is 15% by weight or less, preferably 10% by weight or less.
The coating amount is preferably 1 to ²⁰ g, more preferably 5 to 15 g in terms of coating liquid weight per 1 m ² of film.

As a coating method, various known methods can be applied. For example, a roll coating method, a gravure roll method, a spray coating method, an air knife coating method, a bar coating method, an impregnation method and a curtain coating method can be applied alone or in combination.

The polyester film coated as described above before the completion of oriented crystallization is dried and then subjected to steps such as stretching and heat setting. The coated polyester film of the present invention obtained by coating the coating liquid for the undercoat layer on the polyester film exhibits good adhesion and water resistance to hydrophilic colloids such as polyvinyl alcohol and gelatin.

The antistatic and easily adhesive polyester film of the present invention may be provided with at least one hydrophilic colloid layer thereon to produce various films. For example, a photographic light-sensitive material can be prepared by providing at least one silver halide photographic emulsion layer on at least one surface of the antistatic and easily adhesive polyester film of the present invention.

Examples of the hydrophilic colloid used in the hydrophilic colloid layer include proteins such as gelatin, albumin and casein; cellulose derivatives such as hydroxyethyl cellulose, carboxymethyl cellulose and cellulose sulfates, sodium alginate and starch derivatives. Sugar derivative: Polyvinyl alcohol, polyvinyl alcohol partial acetal, poly-N-vinylpyrrolidone, polyacrylic acid, polymethacrylic acid, polyacrylamide, polyvinylimidazole, polyvinylpyrazole, etc. Although molecular substances can be used, gelatin is preferably used. In addition to lime-processed gelatin, acid-processed gelatin and Bull Society Science
Photography Japan (Bull.Soc.Sci.Phot.
Japan), No. 16, page 30 (1966), oxygen-treated gelatin may be used, or a hydrolyzate or an enzymatic hydrolyzate of gelatin may be used. Graft polymers with other polymers can also be used.

As the silver halide emulsion used in the silver halide emulsion layer in producing a photographic light-sensitive material using the antistatic and easily adhesive polyester film support of the present invention, various ordinary silver halide emulsions can be used. It can be used arbitrarily. The emulsion can be chemically sensitized by a conventional method, and can be optically sensitized to a desired wavelength region by using a sensitizing dye.

Further, an antifoggant, a stabilizer, a hardener and the like can be added to the above silver halide emulsion. As the binder of the emulsion, it is advantageous to use the hydrophilic colloid as described above, and gelatin is particularly advantageous in the present invention.

In the silver halide emulsion layer and other hydrophilic colloid layers, the film strength can be increased by using a hardening agent. Such hardening agents include aldehyde type, aziridine type, isoxazole type and epoxy type. A system hardener, a vinylsulfone system, an acryloyl system, a carbodiimide system, a triazine system, a polymer system, a maleimide system, an acetylene system, and a methanesulfonic acid ester system hardener can be used alone or in combination. Also, plasticizers, dispersions of water-insoluble or sparingly soluble synthetic polymers (latex), couplers, coating aids, antistatic agents, formalin scavengers, optical brighteners, matting agents, lubricants, image stabilizers,
A surfactant, an antifoggant, a development accelerator, a development retarder, a bleaching accelerator and the like may be contained.

The photographic light-sensitive material is provided with a protective layer, a filter layer, a back coating layer, an antihalation layer, an antiirradiation layer, an auxiliary layer such as an intermediate layer, etc. as a hydrophilic colloid layer other than the above silver halide emulsion layer. be able to.

The antistatic and easily-adhesive polyester film of the present invention is not limited to a support of a photographic light-sensitive material,
Especially for C packaging materials, magnetic recording bases, various plate making applications, tracing films, electrophotographic films, overhead projector films and offset printing inks, UV curable inks, base films for easy adhesion of cellophane inks, etc. It is preferably used.

[0055]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited thereto.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.65 was melt extruded from a T die at 280 ° C. into a film and electrostatically applied,
Unstretched film (thickness
1000 μm) is obtained. Preheat this to 75 ° C and set it to 3 in the vertical direction.
After the double stretching, corona discharge treatment was performed. Next, the coating liquid for undercoat layer shown below was applied onto the surface-treated film with a wire bar coater to give a coating thickness of 0.3 μm after biaxial stretching.
After being applied so as to have a thickness of 100 ° C., the film was stretched 3 times in the transverse direction at 100 ° C. and heat treated at 220 ° C. to obtain a biaxially stretched polyester film.

(Coating liquid for undercoat layer) The following polyester copolymer (A) was stirred in hot water at 95 ° C for 3 hours to obtain a 15% by weight aqueous polyester copolymer solution, and the following conductive polymer ( The weight ratio of (B) was (A) / (B) = 65/35, and the solid content was adjusted to 10% by weight. The following polyglycerin (C) was added to this in an amount of 1 part by weight based on the total solid content to prepare a coating liquid for the undercoat layer.

Polyester copolymer (A): dimethyl terephthalate / dimethyl isophthalate / dimethyl sulfoisophthalate / 1,4-cyclohexanedicarboxylic acid //
The polyester having an intrinsic viscosity of 0.34 dl / g of a composition comprising ethylene glycol / (40/33/7/20 // 100) mol%

[0059]

[Chemical 6]

The obtained biaxially stretched polyester film was evaluated according to the following evaluation methods.
The results are shown in Table 1.

Evaluation Method [Stability of Coating Solution] The state of the coating solution for the undercoat layer was visually observed, and the degree of stability was evaluated in three levels according to the criteria shown below. Evaluation criteria 1. Aggregated and sedimented 2. Gelled 3. Was stable

[Adhesiveness] After applying the undercoat layer coating solution,
A razor was used to scratch the upper surface of the coating layer at an angle of 45 ° from the horizontal plane, and the humidity was adjusted in an air-conditioned room at 23 ° C and 60% RH. After conditioning the humidity, attach cellophane tape to the wound area and press it well,
The cellophane tape was torn off suddenly. The peeled area of the peeled coating layer was examined, and 5-grade evaluation was performed according to the following evaluation criteria. Evaluation criteria 1. Peeling area 100% or more 2. Peeling area 50% or more and less than 100% 3. Peeling area 10% or more and less than 50% 4. Peeling area 5% or more and less than 10% 5. Peeling area less than 5%

[Transparency] TURBIDI METER
MODEL T-2600DA Turbidimeter (manufactured by Tokyo Denshoku Co., Ltd.)
Was used to determine the turbidity (%).

[Presence or absence of cracks in coating film] After the coating layer surface of the biaxially stretched polyester film was dyed with methylene blue, the state of cracks on the coating layer surface was observed with an optical microscope and evaluated according to the following evaluation criteria. Evaluation criteria 1. No cracks at all 2. Those with minute cracks 3. Coarse cracked

[Surface specific resistance] MODEL-VE-30 (manufactured by Kawaguchi Denki Kogyo Co., Ltd.) was used to apply an applied voltage of 100 V, 23.
The surface specific resistance value (Ω) was measured under conditions of ° C and 30% RH.

Examples 2 and 3 In Example 1, the blending amounts of the polyester copolymer (A), the conductive polymer (B) and the polyglycerin (C) were changed as shown in Table 1, and Denacol was used as a crosslinking agent. A biaxially stretched polyester film was obtained in the same manner except that EX-521 (manufactured by Nagase Kasei Co., Ltd.) was used in the amounts shown in Table 1.

The polyester film thus obtained was evaluated in the same manner as in Example 1. The results are shown in Table 1.

Example 4 In Example 2, the polyglycerin (C) was changed to the polyglycerin shown below, the cationic species of the conductive polymer was changed from H ⁺ to NH ₄ ⁺ , and the polyester copolymer (A ), Conductive polymer (B), polyglycerin (C)
A biaxially stretched polyester film was obtained in the same manner except that the compounding amount of the crosslinking agent was changed as shown in Table 1.

The polyester film thus obtained was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0070]

[Chemical 7]

Examples 5 and 6 In Example 2, the conductive polymer cation species was NH.
₄ is a ^+, a number average molecular weight of 70,000 (Example 5) of a conductive polymer or 5,000 respectively changed to those of Example 6, and the polyester copolymer (A), a conductive polymer (B), poly A biaxially stretched polyester film was obtained in the same manner except that the blending amounts of glycerin (C) and the crosslinking agent were changed as shown in Table 1.

The polyester film thus obtained was evaluated in the same manner as in Example 1. The results are shown in Table 1.

Examples 7 to 10 In Example 2, except that the blending amounts of the polyester copolymer (A), the conductive polymer (B), the polyglycerin (C) and the crosslinking agent were changed as shown in Table 1. Similarly, a biaxially stretched polyester film was obtained.

The polyester film thus obtained was evaluated in the same manner as in Example 1. The results are shown in Table 1.

Example 11 In Example 2, the conductive polymer (B) was changed to the conductive polymer (B) shown below, and the polyester copolymer (A), conductive polymer (B), polyglycerin ( A biaxially stretched polyester film was obtained in the same manner except that the compounding amounts of C) and the crosslinking agent were changed as shown in Table 1.

The polyester film thus obtained was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0077]

[Chemical 8]

Example 12 In Example 2, the cross-linking agent was changed to the cross-linking agent shown below, and the amounts of the polyester copolymer (A), the conductive polymer (B), the polyglycerin (C) and the cross-linking agent were mixed. Was changed as shown in Table 1 to obtain a biaxially stretched polyester film in the same manner.

The polyester film thus obtained was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0080]

[Chemical 9]

Example 13 In Example 2, the coating liquid for undercoat layer was applied to a biaxially stretched film on which oriented crystallization was completed, and a polyester copolymer (A), a conductive polymer (B), A polyester film was obtained in the same manner except that the compounding amounts of polyglycerin (C) and the crosslinking agent were changed as shown in Table 1.

The polyester film thus obtained was evaluated in the same manner as in Example 1. The results are shown in Table 1.

Example 14 In Example 2, the blending amounts of the polyester copolymer (A), the conductive polymer (B), the crosslinking agent (D) and the polyglycerin (C) were changed as shown in Table 1, and A biaxially stretched polyester film was obtained in the same manner except that the surfactant was used in the amount shown in Table 1.

Comparative Examples 1 and 2 In Example 5, polyglycerin (C) was not used,
A polyester film was obtained in the same manner except that the compounding amounts of the polyester copolymer (A), the conductive polymer (B) and the crosslinking agent were changed as shown in Table 1.

The same evaluation as in Example 1 was performed on the obtained polyester film. The results are shown in Table 1.

[0086]

[Table 1] Note) In Table 1, the blending amount of polyglycerin (C) and the surfactant is the weight% with respect to the total solid content of the aqueous solution comprising the polyester copolymer (A), the conductive polymer (B) and the crosslinking agent (D). It is indicated by.

As is clear from Table 1, Examples 1 to 13 were found to have satisfactory values for all evaluations.

[0088]

As described above in detail, the present invention can provide a biaxially stretched polyester film having excellent transparency, antistatic property and easy adhesion.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI technical display location // (C08L 67/02 25:02) B29K 67:00 (72) Inventor Akihisa Nakajima Sakura Town, Hino City, Tokyo No. 1 Konica stock company (72) Inventor Yoshihiro Wada No. 1 Sakura-cho, Hino-shi, Tokyo Konica stock company (72) Inventor Noriyuki Tachibana No. 1 Sakura-cho, Hino-shi, Tokyo Konica stock company (72) Inventor Ryodo Ozawa 4-1, Kanebocho, Hofu-shi, Yamaguchi Prefecture Kanebo Stock Association In-house (72) Inventor Hitoshi Kawamoto 4-1, Kanebo-cho, Hofu City Yamaguchi Prefecture In-house (72) Inventor Hiroshi Naito Kanebo-cho, Hofu City Yamaguchi Prefecture No. 4 No. 1 Kanebo Stock Association In-house (72) Inventor Makoto Mori 1-6-7-102, Tomobuchi-cho, Miyakojima-ku, Osaka-shi, Osaka (72) Inventor Yukio Ebisawa 1-32-27, Uenohigashi, Toyonaka-shi, Osaka 204 issue

Claims (3)

[Claims] 1. A water-soluble or water-dispersible polyester copolymer (A), a conductive polymer (B) having a compound represented by the following general formula [I], and polyglycerin (C). A featured composition. [Chemical 1] [In the formula, M represents H ⁺ or NH ₄ ⁺ . ] 2. At least one layer containing the composition of claim 1 on at least one side of a polyester film.
An antistatic and easily adhering polyester film having a layer. 3. A polyester film is formed by laminating at least one layer containing the composition according to claim 1 on one side of a polyester film before the completion of oriented crystals and further at least uniaxially stretching it to complete oriented crystallization. A method for producing an antistatic and easily adhesive polyester film, which comprises: