JPH08143691A - Antistatic film - Google Patents

Abstract

PURPOSE: To prepare an antistatic film having improved back-transfer property of antistatic agent by coating one surface of a polyester film with an aqueous coating liquid containing a composition composed of a specific polymer and a specific binder resin, drying the coating layer and drawing the film to form an antistatic coating layer on the film. CONSTITUTION: This antistatic film has an antistatic coating layer produced by coating at least one surface of a polyester film with an aqueous coating liquid containing a composition composed of (A) 2-95wt.% of a polymer (preferably a halogen-free polymer) having cationic nitrogen atom on the side chain of the molecule and (B) 5-98wt.% of at least one kind of binder resin selected from (i) nonionic polyester resin, (ii) nonionic acrylic resin and (iii) nonionic acryl-modified polyester resin, drying the coating layer and drawing the coated film.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an antistatic film,
More specifically, magnetic recording materials such as magnetic cards (for example, telephone cards and prepaid cards), magnetic tapes (for example, audio tapes and video tapes), magnetic disks (for example, floppy disks), electronic materials, and graphic materials having excellent antistatic properties. , An antistatic film useful as a plate making film, an OHP film, and the like.

[0002]

Films made of polyester such as polyethylene terephthalate and polyethylene naphthalate are widely used for magnetic recording materials such as magnetic cards and magnetic tapes, and for general industrial materials such as packaging materials, photographic materials and graphic materials. ing. However, such a polyester film has a drawback that it has a large surface resistivity and is easily charged by friction or the like. When the film is charged, dust or dirt is attached to the surface of the film, which causes troubles. In addition, electric discharge occurs in the processing step, and there is a risk of ignition if an organic solvent is used.

As one of the methods for preventing such troubles due to charging, various methods for forming an antistatic coating film on the film surface have been proposed and put into practical use. As the antistatic agent to be contained in the antistatic coating film, a low molecular weight type and a high molecular weight type are known, but each has its own advantages and disadvantages. Therefore, the antistatic agent is used properly according to its characteristics.

For example, as a low molecular type antistatic agent, a long-chain alkyl compound having a sulfonate group (Japanese Patent Laid-Open No. 4-
No. 28728) and the like, and surfactant type anionic antistatic agents are known, and as a polymer type antistatic agent, a polymer having an ionized nitrogen element in its main chain (Japanese Patent Application Laid-Open No. 3-301). 255139, JP-A-4-28812.
No. 7, JP-A-6-172562), polystyrene sulfonate (JP-A-5-320390) and the like are known.

However, in an antistatic coating film using such a low molecular type antistatic agent, the antistatic agent moves in the coating film, accumulates at the interface, and migrates to the opposite surface of the film (hereinafter There is a problem of "back surface transferability") and a problem of deterioration of antistatic property (hereinafter sometimes referred to as "antistatic property") over time. On the other hand, in the case of antistatic coatings that use high-molecular type antistatic agents, in order to improve antistatic properties, a large amount of antistatic agents must be blended and thick antistatic coatings should be used. Since it is necessary to form it, it is not economical, and there is a problem that the antistatic property deteriorates under low humidity conditions.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art and to provide an antistatic film excellent in antistatic property even if the thickness of the antistatic coating film is thin. It is in.

[0007]

In order to achieve such an object, the present invention has the following constitution. On at least one side of the polyester film, 2 to 95% by weight of a polymer (A) having a cationic nitrogen atom in a side chain of a molecule, a nonionic polyester resin (B-1), a nonionic acrylic resin (B-2) and An aqueous coating solution containing a composition of 5 to 98% by weight of at least one binder resin (B) selected from the group consisting of nonionic acrylic modified polyester resin (B-3) is applied, dried and stretched. An antistatic film provided with an antistatic coating film.

The present invention will be described in detail below.

[Base Film] In the present invention, the base film is a polyester film, and the polyester constituting the film is a linear polyester composed of a dicarboxylic acid component and a glycol component.

Examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, hexahydroterephthalic acid, 4,4'-diphenyldicarboxylic acid, adipic acid, sebacic acid and dodecanedicarboxylic acid. Among them, terephthalic acid and 2,6-naphthalenedicarboxylic acid are particularly preferable because they have excellent mechanical properties and thermal properties of the polyester film.

Examples of the glycol component include ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol. , Cyclohexanedimethanol, polyethylene glycol, polytetramethylene glycol and the like can be mentioned, and ethylene glycol is particularly preferable since the polyester film is excellent in mechanical properties and thermal properties.

As the polyester, polyethylene terephthalate or polyethylene-2,6-naphthalate can be preferably exemplified. The polyethylene terephthalate or polyethylene-2,6-naphthalate may be a polyester obtained by copolymerizing the above-mentioned dicarboxylic acid component or glycol component, and the polyester may be a polyfunctional carboxylic acid component having a functionality of 3 or more or a polyol component. It may be a polyester copolymerized in a small amount in a linear range (for example, 5 mol% or less). Such a polyester can be produced by a conventional method, and it is preferable that the average molecular weight is 10,000 or more because the mechanical properties of the film will be good.

The above polyester may contain organic or inorganic fine particles as a lubricant, for example, in an amount of 0.001 to 5% by weight in order to improve the slipperiness of the film. Specific examples of such fine particles include calcium carbonate, calcium oxide, amylnium oxide, titanium oxide, graphite, kaolin, silica, alumina,
Silicon oxide, zinc oxide, carbon black, silicon carbide, tin oxide, acrylic resin particles, crosslinked polystyrene resin particles,
Preferable examples are melamine resin particles and silicone resin particles.

In addition to the above-mentioned fine particles, a colorant, a known antistatic agent, antioxidant, organic lubricant, catalyst, fluorescent whitening agent, plasticizer, cross-linking agent, slip agent, ultraviolet absorber, other resin, etc. are required. Can be added according to

As the base film in the present invention, a transparent polyester film or a white polyester film can be used depending on the use of the antistatic film. This transparent polyester film has a light transmittance of 60% or more after stretching, and particularly preferably 80% or more. The white polyester film is a polyester blended with, for example, titanium oxide, barium sulfate, or silicon oxide in an amount of 5 to 30% by weight, and has a light transmittance after stretching of less than 60%, particularly 30% or less. Those are preferable. A white antistatic film using a white polyester film as a base film is particularly preferably used for a magnetic card.

The polyester film of the present invention is
It can be manufactured by a conventionally known method. For example, it can be produced by melting the polyester and casting it on a cooling drum to obtain an unstretched film, and then stretching the unstretched film in the machine direction and then in the transverse direction. Further, it can be stretched again in the machine direction and / or the transverse direction. The stretching treatment is performed by the second-order transition point (T
g) It is preferable to carry out stretching at a temperature higher than 2) in each direction by a factor of 2 or more, more preferably 3 or more. At that time, the area stretching ratio is preferably 8 times or more, and more preferably 9 times or more. The upper limit of the area draw ratio depends on the use of the film, but is preferably 35 times, further preferably 30 times. The oriented crystallization can be completed by heat treatment after stretching.

[Polymer (A)] In the present invention, the antistatic coating film is formed by applying an aqueous coating liquid containing a composition comprising the polymer (A) and the binder resin (B) on at least one surface of the polyester film. Then, it is dried and stretched.

The polymer (A) is, for example, a polymer or copolymer obtained by using a compound having an unsaturated double bond in the molecule and a cationic nitrogen atom.

Examples of the compound having an unsaturated double bond in the molecule and having a cationic nitrogen atom include compounds represented by the following general formula (formula I).

[0020]

Embedded image

In (Formula I), R¹, R², R^Four, R^Five, R
⁶Is a hydrogen element or an alkyl group having 1 to 4 carbon atoms (methyl group).
Group, ethyl group, propyl group, isopropyl group, butyl
Group, isobutyl group, s-butyl group, t-butyl group), R
³Is a group represented by the following (formula II) to (formula V), and X is sulfo.
A group having a nate skeleton (-R⁸OSO₃ ^-), Sulfur
A group having a skeleton (-R⁸SO₃ ^-), Carboxylate
Group having skeleton (-R ⁸COO^-), Nitrate group
(-NO₃ ^-), Halogen ions (Cl^-, Br^-,
I^-) (R⁸Is an alkyl group having 1 to 30 carbon atoms, aryl
Group and aralkyl group). In addition, X is a sulfonate bone
Group having a case, group having a sulfate skeleton, carboxy
Selected from a group having a silate skeleton and a nitrate group
If it is a product, the process of applying the antistatic coating, the manufacturing after the application
In the film process or in the process of collecting and reusing the antistatic film
Prevents the generation of corrosive gases due to halogen compounds
Therefore, it is preferable.

[0022]

Embedded image

In formulas (II) to (V), R ⁷ has 1 carbon atom.
The alkylene groups of 6 are shown.

Having an unsaturated double bond in the molecule,
The following can be given as examples of the compound having a cationic nitrogen atom.

[0025]

Embedded image

In the polymer (A), a compound having an unsaturated double bond in the molecule and not having a cationic nitrogen atom (hereinafter sometimes referred to as "other component") has a copolymerization ratio of 0 to 0. It can be used as a copolymerization component in the range of 98 mol%. As other components, for example, ethyl acrylate, methyl acrylate, methyl methacrylate, glycidyl methacrylate, 2-hydroxyethyl acrylate,
Examples thereof include acrylamide, acrylic acid, acrylic acid salt, styrene, vinyl acetate, maleic anhydride and the like.

The average molecular weight of the polymer (A) is arbitrary, but it is preferably 1,000 to 500,000. If the average molecular weight is less than 1,000, the back surface transfer of the polymer (A) becomes remarkable, which is not preferable. On the other hand, if the average molecular weight exceeds 500,000, the viscosity of the aqueous coating solution becomes too high and it becomes difficult to uniformly coat the polyester film, which is not preferable.

[Binder Resin] In the present invention, the binder resin (B) is used in order to make the adhesion between the coating film and the base film stronger. The binder resin (B) is at least one selected from the group consisting of nonionic polyester resin (B-1), nonionic acrylic resin (B-2) and nonionic acrylic modified polyester resin (B-3). It is a resin, and by using such a nonionic resin as the binder resin (B), it is possible to prevent the composition from gelling in the aqueous coating liquid to form a precipitate.

[Nonionic polyester resin (B-
1)] The nonionic polyester resin (B-1) is a resin composed of a polyester having no ionic functional group in its side chain, and has a dicarboxylic acid component having no ionic functional group and an ionic functional group. It is a linear polyester consisting of no glycol component. Examples of this ionic functional group include a sulfonate group, a carboxylate group, a sulfate group, and an alkoxy group.

Examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 4,4
Preferred examples include ′ -diphenyldicarboxylic acid, adipic acid, sebacic acid, dodecanedicarboxylic acid, hexahydroterephthalic acid and the like.

As the glycol component, ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, diglycol Preferred examples include propylene glycol, triethylene glycol, 1,4-cyclohexanedimethanol and the like.

A polyoxyalkylene compound can be used as a copolymerization component for imparting hydrophilicity to the polyester resin (B-1). It is preferable to impart hydrophilicity to the polyester resin (B-1) because the dispersibility in the aqueous coating liquid becomes good. Such compounds include
For example, polyethylene oxide, polypropylene oxide, ethylene oxide propylene oxide copolymer, polytetramethylene glycol, bisphenol A-alkylene oxide adduct, hydrogenated bisphenol A-alkylene oxide adduct and the like can be mentioned.

The nonionic polyester resin (B-
1) may be a polyester having a metal salt at the terminal, which is obtained by reacting a metal compound used as a polymerization catalyst and the like with a terminal group.

[Nonionic acrylic resin (B-2)] The nonionic acrylic resin (B-2) can be obtained by polymerizing an acrylic monomer having no ionic functional group. Examples of the acrylic monomer include ethyl acrylate, methyl acrylate, butyl acrylate, ethyl methacrylate, methyl methacrylate, butyl methacrylate, glycidyl methacrylate, 2-hydroxyethyl acrylate, acrylamide, methacrylamide, and N.
-Methoxymethyl acrylamide, N-methylol acrylamide, etc. can be mentioned. The nonionic acrylic resin (B-2) is a polymer or copolymer containing the above acrylic monomer as a main component, but is styrene, α-
It may be a copolymer containing methyl styrene, vinyl chloride, vinylidene chloride, vinyl acetate, vinyl ether and the like as a copolymerization component.

[Nonionic Acrylic Modified Polyester Resin (B-3)] The nonionic acrylic modified polyester resin (B-3) is an acrylic monomer having no ionic functional group in the presence of the above nonionic polyester resin. It is a copolymer made by polymerizing the body. Examples of the acrylic monomer include ethyl acrylate, methyl acrylate, butyl acrylate, ethyl methacrylate, methyl methacrylate, butyl methacrylate, glycidyl methacrylate, 2-hydroxyethyl acrylate, acrylamide, methacrylamide, and N. -Methoxymethyl acrylamide, N-methylol acrylamide, etc. can be mentioned. The nonionic acrylic modified polyester resin (B-3) is a copolymer obtained by polymerizing the above-mentioned acrylic monomer, and is styrene, α-methylstyrene,
It may contain a monomer such as vinyl chloride, vinylidene chloride, vinyl acetate or vinyl ether as a copolymerization component.

[Other Binder Resins] Examples of binder resins other than the above include polyurethane resins, epoxy resins, vinyl resins, polyether resins, water-soluble resins and the like, which are nonionic.

[Antistatic Coating] The antistatic coating in the present invention is a coating comprising a composition containing the polymer (A) and a binder resin (B) described above. The proportion of the polymer (A) contained in the film is preferably 2% by weight or more, and more preferably 10% by weight or more, in order to improve the antistatic property. If the proportion of the antistatic agent (A) is less than 2% by weight, the antistatic property is insufficient.

[Aqueous Coating Liquid] In the present invention, an antistatic coating film is applied using an aqueous coating liquid containing the polymer (A) and the binder resin (B). A lubricant may be added in order to improve the slipperiness of the surface of the electroconductive coating film and the blocking resistance of the film. Examples of such a lubricant include polystyrene resin,
Examples thereof include fine particles of acrylic resin, melamine resin, silicone resin, fluororesin, urea resin, benzoguanamine resin, polyamide resin, polyester resin and the like. The fine particles of these resins may be thermoplastic or thermosetting as long as they are contained in the antistatic coating in the form of fine particles.

The aqueous coating liquid may further contain other components such as a surfactant, an antioxidant, an antistatic agent other than the polymer (A), a colorant, a pigment, an optical brightening agent, a plasticizer, a cross-linking agent and a slip agent. An agent (a slipperiness-imparting agent such as wax), an ultraviolet absorber or the like can be added.

The solid content concentration of the aqueous coating solution is 1 to 30% by weight.
Is preferable, and 2 to 20% by weight is particularly preferable. When the solid content concentration is within this range, the viscosity of the aqueous coating liquid becomes suitable for coating. The aqueous coating solution used in the present invention can be used in any form such as an aqueous solution, an aqueous dispersion, and an emulsion. Also,
The aqueous coating liquid may contain a small amount of solvent.

[Coating of Antistatic Coating] In the present invention,
At least one surface of the polyester film is coated with the water-based coating solution, dried by heating, and stretched to apply an antistatic coating film.As a method for applying the water-based coating solution, any known coating method is applied. For example, gravure coating method, reverse roll coating method, die coating method, kiss coating method, reverse kiss coating method, offset gravure coating method, Meyer bar coating method, roll brush method, spray coating method, air knife coating method, impregnation method, curtain The coating method and the like can be applied alone or in combination. WET coating amount of the aqueous coating liquid is the running film 1
1 to ²⁰ g, particularly ^{2 to} 12 g per m ² is preferable. When the coating amount is within this range, drying is easy and coating spots are less likely to occur, which is preferable.

The polyester film to which the aqueous coating solution is applied in the present invention is a stretchable polyester film, for example, an unstretched film obtained by heat-melting polyester to form a film as it is; an unstretched film in the longitudinal direction (longitudinal direction). ) Or a uniaxially-stretched film stretched in either the transverse direction (width direction); a biaxially-stretched film in which a longitudinally or transversely uniaxially stretched film is sequentially stretched in the transverse or longitudinal direction (further stretchable). Or a biaxially stretched film obtained by simultaneously stretching the unstretched film in both the machine direction and the transverse direction (further stretchable); heat fixing and / or heat relaxation of the biaxially stretched film (further stretchable) A biaxially stretched heat-treated film may be mentioned. The thickness of the polyester film after the stretching is 1
˜300 μm is preferred.

When the aqueous coating solution is applied to a uniaxially stretched film of the above-described stretchable polyester film, particularly a uniaxially stretched film in the longitudinal direction, the antistatic coating film becomes adhesive or strong and can be efficiently used. This is preferable because an antistatic film can be produced. For example, polyester is heat-melted, extruded into a sheet and cooled to obtain an unstretched film, and the unstretched film is stretched in the machine direction to form a uniaxially stretched film, and then an aqueous coating solution is applied and dried to obtain a transverse direction. The film is stretched, and if necessary, re-stretched in the longitudinal and transverse directions and then heat-treated to prepare an antistatic film coated with an antistatic coating.

The thickness of the applied antistatic coating is 0.005
3 μm, particularly 0.015 to 1 μm is preferable. If the thickness of the coating film is less than 0.005 μm, the antistatic property may be insufficient, and if it exceeds 1 μm, the coating film may be easily scraped, which is not preferable.

[Drying and Stretching Conditions] After applying the aqueous coating liquid in the present invention, the drying temperature is preferably 80 to 150 ° C. because the coating liquid can be dried quickly. The heating for this drying can also serve as the heating during the process of stretching the polyester film. The heat treatment temperature of the polyester film may be 180 to 250 ° C.

[Antistatic Film] The surface resistivity of the antistatic film of the present invention is preferably 1 × 10 ⁸ to 1 × 10 ¹³ Ω / □, and particularly 1 × 10 ⁹ to 1 × 10 ¹² Ω /
□ is preferable.

The antistatic film of the present invention is
A transparent antistatic film with a light transmittance of about 60% or more,
It may be a white antistatic film having a light transmittance of less than about 60%. A polyester film having a light transmittance after stretching of 60% or more is used for the base film of the transparent antistatic film, and a light transmittance after stretching is less than 60% for the base film of the white antistatic film. It is preferable to use 30% or less of white polyester film. The light transmittance of the antistatic film coated with the antistatic coating is 0.005 to 3 μm for the thickness of the antistatic coating, and the antistatic coating contains a coloring agent or a pigment. The light transmittance of the base film is almost the same as that of the base film when it is not blended at a concentration.

A white antistatic film using a white polyester film as a base film is particularly preferably used for a magnetic card. The magnetic card here is
For example, it is a card in which a magnetic recording layer is provided on one surface of an antistatic film and a pattern layer or the like is printed on the other surface by UV ink or the like, and the thickness of the film is, for example, 100 to 30.
Those having a thickness of 0 μm, particularly 150 to 250 μm are preferably used.

A transparent antistatic film using a transparent polyester film as a base film is preferably used for magnetic recording materials such as magnetic tapes and magnetic disks and electronic materials, graphic films, plate-making films, OHP film cards, and films. The thickness varies depending on the use, but for example, a thickness of 15 to 160 μm, particularly 25 to 100 μm is preferably used.

[0050]

EXAMPLES The present invention will be described in more detail with reference to examples. Each characteristic value was measured by the following method.

1. Surface resistivity After leaving the sample film at 23 ° C. × 50% RH for 24 hours, the surface resistivity of the film coated surface was measured using a vibration capacitance type potentiometer TR-84M type (manufactured by Takeda Riken). The applied voltage was 100 Volt.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.66 was melted, cast on a cooling drum, and then stretched 3.3 times in the machine direction at 92 ° C. to obtain a uniaxially stretched film. On one side of this uniaxially stretched film,
[CH ₂ = CHCOOCH ₂ CH ₂ N ⁺ (CH ₃ ) ₃ ]
^{_{[CH 3 OSO 3 -] (}} 22 mol%), ethyl methacrylate (69 mole%) and a copolymer obtained by polymerization of ethyl acrylate (9 mol%) (average molecular weight: 12,00
0) antistatic agent (a-1) 69% by weight, dicarboxylic acid component terephthalic acid (54 mol%), isophthalic acid (40 mol%) and sebacic acid (6 mol%), glycol component ethylene glycol Polyester resin (b-1) which is a copolymer (average molecular weight: 19,500) of (88 mol%) and diethylene glycol (12 mol%).
A 5% by weight aqueous solution of a composition comprising 18% by weight and 13% by weight of ethylene oxide / propylene oxide copolymer (c-1) was applied by a gravure coater. Then, the coated film was dried at 95 ° C., and then horizontally at 3.6 ° C. at 3.6 ° C.
The film was double-stretched and heat-treated at 219 ° C. to prepare a film having a thickness of 75 μm and coated with an antistatic coating. The antistatic coating film of the film had a thickness of 0.28 μm and a light transmittance of 85%. The characteristics of this film are shown in Table 1.

[Comparative Example 1] Table 1 shows the characteristics of the film obtained in the same manner as in Example 1 except that the aqueous liquid was not applied.

[Examples 2 to 7 and Comparative Examples 2 to 3] The characteristics of the film obtained in the same manner as in Example 1 are shown except that the composition of the coating liquid and the coating thickness are changed as shown in Table 1. Shown in 1.

Example 8 Polyethylene terephthalate having an intrinsic viscosity of 0.64 and containing 10% by weight of titanium oxide was used as a base film, and the film thickness was 150 μm.
A film having a light transmittance of 2% was obtained in the same manner as in Example 1 except that the composition of the coating liquid and the coating thickness were changed as shown in Table 1. The characteristics of this film are shown in Table 1.

[0056]

[Table 1]

In the antistatic coating composition of Table 1, antistatic agents [a-1], [a-2], [a-3], binder resins [b-1], [b-2], [b]. -3], [b-4] and the other component [c-1] are the following copolymers,
It is a compound or mixture.

[0058]

Embedded image [a-1]: [CH ₂ ═CHCOOCH ₂ CH
^{_{2 N + (CH 3) 3}} ] [CH 3 OSO 3 -] (22 mol%), ethyl methacrylate (69 mole%) and a copolymer obtained by polymerization of ethyl acrylate (9 mol%) ( average molecular _{weight: 12,000) [a-2]} : [CH 2 = CHCOO (CH 2) 3 N
^{_{+ (C 2 H 5) 3}} ] [NO 3 -] (20 mole%), methyl methacrylate (70 mole%) and ethyl acrylate (1
Copolymer obtained by polymerizing 0 mol%) (average molecular weight:
21,500) [a-3]: a copolymer obtained by polymerizing methyl acrylate (16 mol%), polystyrene sulfone soda (32 mol%) and methyl methacrylate (52 mol%).
(Average molecular weight: 24,000)

[0059]

Embedded image [b-1]: Dicarboxylic acid component is terephthalic acid (54 mol%), isophthalic acid (40 mol%) and sebacic acid (6 mol%), glycol component is ethylene glycol (88 mol%) and diethylene glycol Copolymer of (12 mol%) (average molecular weight: 19,500) [b-2]: polyester resin [a-1] 50% by weight
And ethyl acrylate (6 mol%), butyl acrylate (3 mol%), ethyl methacrylate (30 mol%), methyl methacrylate (47 mol%), glycidyl methacrylate (8 mol%), 2-hydroxy Ethyl acrylate (4 mol%), N-methoxymethyl acrylamide (2
Copolymer obtained by polymerizing (mol%) (average molecular weight:
25,000) 50% by weight of mixture [b-3]: 50% by weight of polyester resin [a-1], methyl acrylate (8 mol%), butyl acrylate (5 mol%), ethyl methacrylate. (30 mol%), methyl methacrylate (37 mol%), glycidyl methacrylate (10 mol%), 2-hydroxyethyl acrylate (6 mol%), N-methoxymethyl acrylamide (4 mol%) are graft-polymerized. Obtained copolymer (average molecular weight: 34,000) [b-4]: dicarboxylic acid component was terephthalic acid (50 mol%), isophthalic acid (49 mol%) and 5-K sulfoisophthalic acid (1 mol%) ), Glycol component is ethylene glycol (21 mol%), diethylene glycol (3
4 mol%) and neopentyl glycol (45 mol%)
Copolymer (average molecular weight: 19,600) [c-1]: ethylene oxide (42 mol%), propylene oxide (58 mol%) copolymer (average molecular weight:
9,250)

[0060]

INDUSTRIAL APPLICABILITY The antistatic film of the present invention has excellent antistatic properties even with a thin antistatic coating film, and is a magnetic recording medium such as a magnetic card, packaging material, photographic material, graphic material,
It is useful for plate making film, OHP film and the like.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location B05D 7/24 302 V 7415-4F B29C 55/14 7639-4F B32B 27/08 9349-4F 27 / 36 9349-4F C09K 3/16 104 C G11B 5/704 // B29K 67:00 B29L 7:00 9:00 C08L 67:00

Claims (4)

[Claims] 1. A polyester film having 2 to 95% by weight of a polymer (A) having a cationic nitrogen atom in a side chain of a molecule on at least one side thereof, a nonionic polyester resin (B-1) and a nonionic acrylic resin ( B-2) and a nonionic acrylic modified polyester resin (B-3) at least one binder resin (B) selected from the group consisting of a coating composition containing an aqueous coating solution containing 5 to 98 wt%, An antistatic film provided with an antistatic coating film formed by drying and stretching. 2. The antistatic film according to claim 1, wherein the polymer (A) is a polymer having a cationic nitrogen atom in a side chain of a molecule and containing no halogen element. 3. The antistatic film according to claim 1, wherein the polyester film is a white polyester film and is used for a magnetic card. 4. The antistatic film according to claim 1, wherein the polyester film is a transparent polyester film.