JPH0971673A - Antistatic film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antistatic film having excellent antistatic property even at a low temperature and excellent in adhesiveness, film-recovering property and heat resistance by applying an aqueous coating liquid containing a specific antistatic (co)polymer to a polyester film, drying the liquid and drawing the film. SOLUTION: An aqueous coating liquid containing a (co)polymer comprising a unit of formula I and/or II (R<1> and R<2> are each H or methyl; R<3> is a 2-10C alkylene; R<4> to R<6> are each H or a 1-5C alkyl; X is a halogen, NO3 , etc.; R<7> and R<8> are each H or methyl) is applied to at least one face of a polyester film (preferably polyethylene terephthalate film or polyethylene 2,6-naphthalate film) and the coating liquid is dried and the film is drawn. A copolymer composed of 4-60mol% unit of formula I and/or II and 40-96mol% unit of formula III (Y is H, an aryl, etc.) is preferably used as the (co)polymer, because the copolymer is excellent in antistatic property and can provide a coating film excellent in adhesiveness to ink, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic film, and more particularly to a magnetic card (for example, a telephone card) which has an excellent antistatic property even under a low humidity condition and is excellent in adhesiveness and film recoverability. , Prepaid cards), magnetic tapes, magnetic recording media such as magnetic disks, graphic films, OHP films, office films such as plate-making films, photographic films, packaging materials and the like.

[0002]

2. Description of the Related Art Polyester films, particularly polyester films using polyethylene terephthalate or polyethylene naphthalate, are widely used for magnetic recording materials such as magnetic cards and general industrial materials such as packaging materials, photographic films and graphic materials. ing.

However, such a polyester film has a drawback that it is easily charged with electricity, and when the film is charged, dust or dust adheres to its surface, which causes a problem in quality. In addition, when an organic solvent is used in the film processing step, there is a problem that a discharge from the charged film causes a risk of ignition.

In order to cope with such problems caused by electrification, an antistatic coating film containing a low molecular weight antistatic agent or a high molecular weight antistatic agent is applied on the surface of the polyester film to reduce the surface specific resistance value of the film. A method has been proposed and put to practical use.

As the low molecular type antistatic agent, for example, a surfactant type anionic antistatic agent such as a long chain alkyl compound having a sulfonate group (Japanese Patent Laid-Open No. 28728/1992) is known. In addition, as a polymer type antistatic agent, a polymer having an ionized nitrogen element in its main chain (Japanese Patent Application Laid-Open No. 3-255139, Japanese Patent Application Laid-Open No. 4-255139)
-288127, JP-A-6-172562) and sulfonate-modified polystyrene (JP-A-5-3).
No. 20390) is known.

However, in the antistatic coating film using such a low-molecular type antistatic agent, the antistatic agent moves in the coating film and accumulates at the interface, and as a result, the magnetic layer and the separating layer are formed on the film surface. There are problems that the adhesive properties are adversely affected when a top coat layer such as a mold layer and an easy-adhesion layer is laminated, and that the antistatic property deteriorates with time.

On the other hand, in an antistatic coating film using a polymer type antistatic agent, when the polymer antistatic agent has chlorine, an unstable amino group or the like as an ionic component, it is a waste product When a film (for example, the edge of a film cut and removed from a product) is collected and used as a recycled material for film production, the coating film components contained in the recycled material are thermally deteriorated during melt film formation, and harmful gas is generated. However, there is a problem in that it is generated or the obtained film is markedly colored and is not practical (recovery is poor). In addition, an antistatic coating film using an anionic polymer antistatic agent has a problem that the desired antistatic property is not exhibited under low humidity conditions such as a relative humidity of 50% or less. An antistatic coating film using a polymer antistatic agent has a problem of poor film recovery.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems of the prior art, to have excellent antistatic property even under the condition of low humidity, and to have excellent adhesiveness and film recoverability. An object of the present invention is to provide a laminated film having an electric coating film.

[0009]

The object of the present invention is, according to the invention, to at least one side of a polyester film,
An antistatic coating film prepared by applying an aqueous coating solution containing a polymer or copolymer comprising units represented by the following formula (I) and / or the following formula (II), drying and stretching This is achieved by the antistatic film provided.

[0010]

[Chemical 6]

In the formula (I), R ¹ and R ² are each a hydrogen element or a methyl group; R ³ is an alkylene group having a carbon number of 2 to 10; R ⁴ , R ⁵ and R ⁶ are a hydrogen element or a carbon number, respectively. Is an alkyl group of 1 to 5; X is a halogen element,
NO ₃ , R ⁹ SO ₃ , R ⁹ OSO ₃ or OP (= O)
(OM ¹ ) ₂ (wherein R ⁹ is an alkyl group having 1 to 10 carbon atoms, an aryl group or a cycloalkyl group, M ¹ is a hydrogen element, an alkali metal or an alkyl group having 1 to 10 carbon atoms) Show.

[0012]

[Chemical 7]

In the formula (II), R ⁷ and R ⁸ are each a hydrogen element or a methyl group.

The present invention will be described in detail below.

[Base Film] In the present invention, a polyester film is used as the base film, and the polyester constituting the base 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.

As the glycol component, for example, ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, cyclohexanedimethanol, polyethylene glycol. And the like, and ethylene glycol is particularly preferable.

Of these polyesters, polyethylene terephthalate or polyethylene-2,6-naphthalate is excellent in mechanical properties such as high Young's modulus, and is excellent in thermal properties such as good heat resistance and dimensional stability. It is preferable because it is possible.

The above-mentioned polyester may be a polyester obtained by copolymerizing the above-mentioned dicarboxylic acid component, glycol component or the like in order to improve the adhesion between the polyester film and the coating film. It may be a polyester obtained by copolymerizing a small amount of the above polyvalent compound in a range in which the polyester becomes substantially linear (for example, 5 mol% or less).

Such polyester can be produced by a conventional method. Further, it is preferable that the intrinsic viscosity of the polyester is 0.5 or more because the mechanical properties such as the rigidity of the film are good.

The above polyester has a mean particle size of 0.1 as a lubricant in order to improve the slipperiness of the film.
It is preferable to add organic or inorganic fine particles of about 01 to 20 μm at a blending ratio of, for example, 0.005 to 20% by weight. Specific examples of such fine particles include inorganic fine particles such as silica, alumina, calcium carbonate, titanium oxide, barium sulfate, kaolin, and carbon black, and crosslinked silicone resin, melamine resin, polystyrene resin, crosslinked polystyrene resin, acrylic resin, crosslinked acrylic resin. Preferred examples include organic fine particles and the like. When a white polyester film is used as the base film, titanium oxide, barium sulfate or silica is preferred.

In addition to the fine particles, colorants, known antistatic agents, antioxidants, organic lubricants, catalysts, optical brighteners, plasticizers, crosslinking agents, slip agents, UV absorbers, other resins, etc. are required. Can be added according to

Depending on the application of the laminated film, a white polyester film can be used as the base film. This white polyester film is, for example, a polyester film containing 5 to 30% by weight of titanium oxide, barium sulfate, silicon oxide, etc., and the light transmittance of the stretched film is 30% or less, particularly 10% or less. .

The polyester film used in the present invention is
It can be manufactured by a conventionally known method. For example, the polyester is heated and melted in an extruder, cast on a rotating cooling drum to give an unstretched film, and then the unstretched film is stretched 2 to 7 times in the machine direction to give a uniaxially stretched film, preferably this It can be produced by applying the aqueous coating solution of the present invention to a uniaxially stretched film, and then drying it at 80 to 120 ° C., or by drying and then stretching it in the transverse direction by 2 to 8 times. Further stretching may be carried out in the machine direction and / or the transverse direction if necessary. In addition, after stretching 130 to
It is also possible to complete the oriented crystallization by heat treatment at 260 ° C. The stretching temperature is preferably higher than the second-order transition point (Tg) of polyester. The thickness of the stretched polyester film is preferably 2 to 300 μm because the film forming property of the film is good, and when the antistatic film is used for a magnetic card, it is 50 to 300 μm.
The thickness of μm is preferable because the rigidity of the magnetic card is improved.

[Antistatic Polymer] In the present invention, the above formula (I) is provided on at least one surface of the polyester film.
And / or a polymer or copolymer comprising the unit represented by the formula (II) (hereinafter referred to as "antistatic polymer") is applied, dried and stretched to form a coating solution. Provide an electric coating film.

The antistatic polymer contains 3 to 99 mol% of the unit represented by the formula (I) and / or the formula (II).
Particularly, 4 to 60 mol%, and at least one unit represented by the following formula (III), formula (IV) and formula (V) is 1 to 9
A copolymer composed of 7 mol%, particularly 40 to 96 mol%, is preferable because a coating film having excellent antistatic property and excellent adhesion to ink or the like can be obtained.

[0027]

Embedded image

In the formula (III), Y is a hydrogen element, an alkyl group having 1 to 10 carbon atoms, an aryl group, a cycloalkyl group, a CN group, a COOR ¹⁰ group (R ¹⁰ is an alkyl group having 1 to 10 carbon atoms. , Aryl group, cycloalkyl group, glycidyl group, OH group-substituted alkyl group, aziridine group-substituted alkyl group or oxirane group-substituted alkyl group), OR ¹¹ group (R ¹¹ is an alkyl group having 1 to 10 carbon atoms or CHR ¹
CHR ² OR ¹⁶ group (R ¹⁶ is a hydrogen element or a carbon number of 1 to
10 alkyl groups), COR ¹² groups (R ¹² having 1 to 1 carbon atoms
0 alkyl group), CONR ¹³ R ¹⁴ group (R ¹³ and R ¹⁴ are each a hydrogen element, an alkyl group having 1 to 10 carbon atoms, CH
₂ OH or CH ₂ OR ¹⁶ ), OCOR ¹⁵ group (R ¹⁵ is an alkyl group, aryl group or cycloalkyl group having 1 to 10 carbon atoms), COOM group, SO ₃ M group, R ³ CN group,
R ³ COOR ¹⁰ group, R ³ COR ¹² group, R ³ CONR ¹³ R
¹⁴ groups, R ³ OCOR ¹⁵ groups, R ³ COOM groups or R ³ S
It shows that it is an O ₃ M group.

[0029]

Embedded image

In the formula (IV), Z is O, NH or N
R ¹⁷ (R ¹⁷ is an alkyl group having 1 to 10 carbon atoms, an aryl group or a cycloalkyl group).

[0031]

Embedded image

In the formula (V), M represents a hydrogen element, an alkali metal or a quaternary amine group.

The unit represented by the above formula (I) is
For example, the following formulas (I-1) to (I-5) can be mentioned.

[0034]

Embedded image

[0035]

[Chemical 12]

[0036]

Embedded image

[0037]

Embedded image

[0038]

[Chemical 15]

Examples of the unit represented by the above formula (II) include the following formulas (II-1) to (II-4).

[0040]

Embedded image

[0041]

Embedded image

[0042]

Embedded image

[0043]

Embedded image

The unit represented by the above formula (III) is
For example, the following formulas (III-1) to (III-14) can be mentioned.

[0045]

Embedded image

[0046]

[Chemical 21]

[0047]

Embedded image

[0048]

Embedded image

[0049]

Embedded image

[0050]

Embedded image

[0051]

[Chemical formula 26]

[0052]

Embedded image

[0053]

Embedded image

[0054]

[Chemical 29]

[0055]

Embedded image

[0056]

[Chemical 31]

[0057]

Embedded image

[0058]

[Chemical 33]

Examples of the unit represented by the above formula (IV) include the following formula (IV-1) and the following formula (IV-2).

[0060]

Embedded image

[0061]

Embedded image

The unit represented by the above formula (V) is
For example, the following formula (V-1) and the following formula (V-2) can be given.

[0063]

Embedded image

[0064]

Embedded image

The average molecular weight of the antistatic polymer in the present invention is preferably 3,000 to 1,000,000. The aqueous coating solution used for applying the antistatic coating film is an aqueous solution, emulsion or water dispersion of this antistatic polymer.

[Antistatic Coating] The antistatic coating of the present invention is prepared by applying the above-mentioned aqueous coating solution containing the antistatic polymer, drying and stretching. A binder resin can be blended in order to further improve the adhesion between the base film and the base film. Examples of the binder resin include polyester resin, acrylic resin, acrylic modified polyester resin, urethane resin, epoxy resin, vinyl resin, polyether resin, and water-soluble resin. The blending ratio of the binder resin is 0 to 95% by weight based on the total amount of the antistatic polymer and the binder resin,
It is particularly preferably 20 to 90% by weight. If this ratio exceeds 95% by weight, the antistatic property of the laminated film may be insufficient.

[Aqueous Coating Liquid] In the present invention, an antistatic coating film is applied using an aqueous coating liquid containing the above composition, and the solid content concentration of the aqueous coating liquid is preferably 1 to 30% by weight. It is particularly preferably 2 to 20% by weight. When the solid content concentration is within this range, the viscosity of the aqueous coating liquid becomes suitable for coating. The aqueous coating liquid used in the present invention can be used in any form such as an aqueous solution, an aqueous dispersion, and an emulsion. Further, the aqueous coating liquid may contain a small amount of solvent.

The aqueous coating liquid in the present invention may contain a surfactant in order to apply the coating liquid uniformly on the surface of the polyester film. Examples of the surfactant include polyalkylene oxide polymers such as polyethylene oxide, polyalkylene oxide copolymers such as polyethylene oxide polypropylene oxide, aliphatic alcohol alkylene oxide adducts, long-chain aliphatic substituted phenol / alkylene oxide addition polymerization. Compounds, polyhydric alcohol fatty acid esters, long-chain aliphatic amide alcohols, quaternary ammonium salt compounds, alkylpyridinium salt compounds, sulfonate compounds and the like. Of these, nonionic surfactants are particularly preferable.

A filler may be added to the aqueous coating solution in order to improve the slipperiness of the coating film. As the filler, for example, silica, alumina, titanium oxide, inorganic fine particles such as carbon black, polystyrene resin, crosslinked polystyrene resin, acrylic resin, crosslinked acrylic resin, melamine resin, silicone resin, fluororesin,
Examples thereof include fine particles of a resin such as urea resin, benzoguanamine resin, polyamide resin and polyester resin. The resin may be a thermoplastic resin or a thermosetting resin as long as it is a resin that can maintain the state of fine particles in the coating film, and a resin crosslinked with a degree of crosslinking according to the purpose. May be

In addition to the above fine particles, antioxidants, colorants, pigments, optical brighteners, plasticizers, other cross-linking agents, organic lubricants (slipping agents), ultraviolet absorbers, antistatic agents, etc. may be added as required. Can be added.

[Coating of Coating Film] In the present invention, the antistatic coating film is coated on at least one surface of the polyester film by coating the above-mentioned aqueous coating solution, heating and drying, and stretching. As the coating method of the coating liquid, any known coating method can be applied, for example, a gravure coating method, a reverse roll coating method, a die coating method, a kiss coating method, a reverse kiss coating method, an offset gravure coating method, a Mayer bar coating method, a roll. The brush method, the spray coating method, the air knife coating method, the impregnation method, the curtain coating method and the like can be applied alone or in combination. The WET coating amount of the aqueous coating liquid is preferably 1 to 40 g, particularly ^{2 to 20} g per 1 m ² of the running film. It is preferable that the coating amount is in this range because drying becomes easy and coating unevenness hardly occurs.

The film to which the aqueous coating solution is applied in the present invention is
It is a stretchable polyester film. The stretchable polyester film is, for example, an unstretched film obtained by heating and melting polyester to form a film as it is; the unstretched film was stretched in either the longitudinal direction (longitudinal direction) or the transverse direction (width direction). Uniaxially stretched film; longitudinally or transversely uniaxially stretched film was sequentially stretched in the transverse or longitudinal direction (further stretchable)
A biaxially stretched film or a biaxially stretched film obtained by simultaneously stretching (unstretchable) an unstretched film in both the machine direction and the transverse direction can be mentioned. The thickness of the polyester film after stretching is 2 to 300μ
m, particularly preferably 150 to 260 μm.

The thickness of the antistatic coating film is 0.01 to 1 μm.
m, particularly preferably 0.02 to 0.6 μm.
If the thickness of the antistatic coating film is less than 0.01 μm, the antistatic property may be insufficient, and if it exceeds 1 μm, the surface of the coating film may be rough or the coating film may be easily scraped.

[Magnetic Card] The antistatic film of the present invention can be used for a magnetic card. With this magnetic card, for example, a magnetic recording layer (magnetic layer) is provided on one side of the antistatic film. It is a card having a printing layer formed on one side with UV ink or the like.

For example, a polyurethane oligomer having an acrylic group at the end (for example, a bisacrylic polyurethane oligomer) on the coated surface of the antistatic film of the present invention or a vinyl polymer having an acrylic group at the end (for example, bisacrylic vinyl). A printing layer can be provided by printing an ink in which a photopolymerization initiator, a photosensitizer, and a colorant are mixed in (polymer) and curing by irradiating with ultraviolet rays, and for example, magnetic iron oxide can be provided on the other surface. , Modified vinyl chloride resin,
It is possible to provide a magnetic layer by coating a magnetic paint composed of polyurethane resin, polyisocyanate, a dispersant, etc. on the base film and drying it. A protective layer may be further provided and used. A magnetic card can be obtained by cutting a film provided with such a printing layer or a magnetic layer.

The light transmittance of the base film is 5%.
The following white polyester films can be used.

The thickness of the antistatic film used for the magnetic card is, for example, 50 to 300 μm, particularly 150 to 250 μm.
It is preferable that the card has good rigidity of the card.

Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to the following Examples. The evaluation in the present invention was performed by the following method.

[0079]

The present invention will be described in more detail with reference to the following examples. The characteristics of the film were measured by the methods described below. Moreover, an average molecular weight shows a number average molecular weight.

1. Antistatic property The surface specific resistance of the coating surface of the film sample held under the conditions of 21 ° C. and 38% RH was measured with a vibration capacitance type potentiometer TR-84M type (manufactured by Takeda Riken).

2. Adhesiveness (ink adhesion) 8 μm of ink containing terminal bisacryl polyurethane oligomer, bisacryl vinyl polymer, photopolymerization initiator, photosensitizer, and colorant is applied to the coating surface of the film and irradiated with ultraviolet rays. And cured to form an ink film.
Then attach cellophane tape to this coated surface and peel it off,
The adhesiveness was evaluated from the peeling condition as follows. A: Peeling occurred between the cellophane tape and the ink film. (Good adhesion) B: The ink film was peeled off in a state of partial cohesive failure. (Slightly good adhesiveness) C: Peeled between the film and the ink film. (Poor adhesion)

3. Heat resistance Polyester film sample 1 without coating
After melting and heating 5 g at 302 ° C. for 37 minutes under a nitrogen stream, the mixture was transferred onto a metal plate and rapidly cooled to prepare a plate-shaped sample,
This sample was used as a reference sample. Then, 15 g of the film sample coated with the coating film was subjected to 302
After melting and heating at 37 ° C. for 37 minutes, the mixture was transferred onto a metal plate and rapidly cooled to prepare a plate-shaped sample, and the coloring degree of this sample was compared with the coloring degree of the reference sample, and evaluated according to the following criteria.

A: Ultra-light yellow color that is almost equivalent to the reference sample (good heat resistance) B: Light yellow color that is stronger than the reference sample (slightly good heat resistance) C: Yellow color that is extremely stronger than the reference sample (poor heat resistance)

[Example 1] Polyethylene terephthalate having an intrinsic viscosity of 0.65 (containing 12% by weight of titanium oxide) was melted and cast on a cooling drum to give an unstretched film, which was heated to 92 ° C. 3. Vertically 3.
The film was stretched 5 times to obtain a uniaxially stretched film.

Then, on both surfaces of this uniaxially stretched film, 37 mol% of the unit of the above formula (I-1) and the above formula (III-1).
Unit of 1 mol%, unit of the formula (III-3) 2 mol%,
26 mol% of the unit of the formula (III-10) and the formula (II-10)
46% by weight of a copolymer (K-1, average molecular weight = 19,500) having a unit of 34 mol% of I-11), ethyl methacrylate component (68 mol%), methyl acrylate component (18 mol%), acrylic Butyl acid component (1 mol%), acrylic acid component (1 mol%), glycidyl methacrylate component (5
Copolymer of a 2-hydroxyethyl acrylate component (3 mol%), an acrylamide component (1 mol%) and an N-methylolacrylamide component (3 mol%) (A).
-1, 42% by weight of average molecular weight = 74,500) and 12% by weight of ethylene oxide / propylene oxide / block copolymer (average molecular weight = 6,770) were applied by a gravure coater. . Then, after drying at 104 ° C., it was laterally stretched 3.7 times at 108 ° C. and further heat treated at 215 ° C. to give a total thickness of 196 μm.
A white laminated film having a coating thickness of 0.11 μm and a light transmittance of 0% was prepared. The characteristics of this laminated film are shown in Table 1.

[Comparative Example 1] A biaxially stretched film was obtained in the same manner as in Example 1 except that no coating film was applied. Table 1 shows the characteristics of this film.

[Examples 2 to 8 and Comparative Examples 2 to 3] Laminated films were obtained in the same manner as in Example 1 except that the composition and thickness of the coating film were changed as shown in Table 1. The characteristics of this laminated film are shown in Table 1.

[0088]

[Table 1]

As is clear from the results shown in Table 1, the antistatic film of the present invention was excellent in antistatic property, adhesive property and heat resistance.

In the coating composition shown in Table 1, [K-2] and [P-2] to [P-5] represent the following polymers or copolymers.

[K-2]: Unit 27 of the above formula (I-2)
Mol%, the unit of the formula (III-1) 1 mol%, the formula (III
-3) unit 12 mol%, the unit 2 of the formula (III-10)
Copolymer of 6 mol% and 34 mol% of the unit of the formula (III-11) (average molecular weight: 10,100) [K-3]: 45 mol% of the unit of the formula (II-1), the formula (II-1) A copolymer of 47 mol% of the unit III-3) and 8 mol% of the unit of the formula (III-1) (average molecular weight: 8,500) [K-4]: the unit 40 of the formula (II-2). Mol%, the unit of the formula (III-3) 43 mol%, the unit of the formula (III-1) 13 mol%, the unit of the formula (IV-1) 2 mol% and the formula (V-1) Copolymer of unit 2 mol% (average molecular weight: 9,200) [K-5]: Polymer of unit of the following formula (VI-1) (average molecular weight = 6,480)

[0092]

Embedded image

Example 9 Co-γFe ₂ O ₃ , a vinyl chloride / vinyl acetate / sodium vinyl sulfonate copolymer, a polyurethane, a polyvalent isocyanate, and a dispersant were formed on one surface of the white laminated film obtained in Example 1. Then, a magnetic layer comprising a lubricant and a protective layer were further applied. Also, on the other side,
A UV-curable ink containing a terminal bis-acryl polyurethane oligomer, a terminal bis-acryl vinyl polymer, a photopolymerization initiator, a photosensitizer and a red colorant was offset-printed and irradiated with ultraviolet rays to be cured. This film was cut to prepare 8,000 cards, but there were no problems in the process and no adhesion of dust, and there were practically no problems in handling the cards and durability of the adhesion of the magnetic layer and the ink layer.

[0094]

According to the present invention, since an antistatic polymer having a specific structure is used as a component of the antistatic coating film, high antistatic property can be obtained even under low humidity conditions, and adhesion and heat resistance can be obtained. An antistatic film having excellent properties can be obtained. The antistatic film of the present invention is particularly useful for magnetic cards.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 7/02 104 B32B 7/02 104 27/08 27/08 27/18 27/18 D 27 / 36 27/36 G11B 5/704 G11B 5/704 // B29K 67:00 B29L 7:00 9:00 C08L 67:00

Claims (5)

[Claims] 1. A polyester film is coated on at least one side thereof with an aqueous coating liquid containing a polymer or copolymer comprising units represented by the following formula (I) and / or the following formula (II), and dried. An antistatic film provided with an antistatic coating film formed by stretching. Embedded image In formula (I), R ¹ and R ² are each a hydrogen element or a methyl group; R ³ is an alkylene group having 2 to 10 carbon atoms;
R ⁴ , R ⁵ and R ⁶ are each a hydrogen element or an alkyl group having 1 to 5 carbon atoms; X is a halogen element, NO ₃ , R ⁹
SO ₃ , R ⁹ OSO ₃ or OP (= O) (OM ¹ ) ₂
(Wherein R ⁹ is an alkyl group having 1 to 10 carbon atoms, an aryl group or a cycloalkyl group, and M ¹ is a hydrogen element, an alkali metal or an alkyl group having 1 to 10 carbon atoms). Embedded image In formula (II), R ⁷ and R ⁸ are each a hydrogen element or a methyl group. 2. The polymer or copolymer comprises units 3 to 9 represented by the above formula (I) and / or the above formula (II).
The antistatic film according to claim 1, which comprises 9 mol% and 1 to 97 mol% of at least one unit represented by the following formula (III), formula (IV) and formula (V). Embedded image In formula (III), Y is a hydrogen element, an alkyl group having 1 to 10 carbon atoms, an aryl group, a cycloalkyl group, a CN group,
COOR ¹⁰ group (R ¹⁰ is an alkyl group having 1 to 10 carbon atoms,
Aryl group, cycloalkyl group, glycidyl group, OH group-substituted alkyl group, aziridine group-substituted alkyl group or oxirane group-substituted alkyl group), OR ¹¹ group (R ¹¹ is an alkyl group having 1 to 10 carbon atoms or CHR ¹ CHR ² OR ¹⁶
A group (R ¹⁶ is a hydrogen element or an alkyl group having 1 to 10 carbon atoms), a COR ¹² group (R ¹² is an alkyl group having 1 to 10 carbon atoms), a CONR ¹³ R ¹⁴ group (R ¹³ and R ¹⁴ are each hydrogen. Element, alkyl group having 1 to 10 carbon atoms, CH ₂ OH or CH ₂ OR ¹⁶ ), OCOR ¹⁵ group (R ¹⁵ has 1 to 1 carbon atoms)
0 alkyl group, aryl group or cycloalkyl group), COOM group, SO ₃ M group, R ³ CN group, R ³ CO
OR ¹⁰ group, R ³ COR ¹² group, R ³ CONR ¹³ R ¹⁴ group, R
³ OCOR ¹⁵ group, R ³ COOM group or R ³ SO ₃ M group. Embedded image In the formula (IV), Z is O, NH or NR ¹⁷ (R ¹⁷ is an alkyl group having 1 to 10 carbon atoms, an aryl group or a cycloalkyl group). Embedded image In the formula (V), M represents a hydrogen element, an alkali metal or a quaternary amine group. 3. The polyester film is a white polyester film, and the thickness of the antistatic coating film is 0.01 to 1 μm.
The antistatic film according to claim 1, which is m. 4. The antistatic film according to claim 1, wherein a polyester film is provided with an antistatic coating film on at least one surface, and a magnetic layer is laminated on one surface of the antistatic film. 5. The antistatic film according to claim 4, wherein an ultraviolet curable ink layer is provided on the opposite surface of the laminated magnetic layer.