JP3212827B2 - Laminated film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film, and more particularly, to a magnetic recording material (for example, an audio tape,
Magnetic recording useful especially for magnetic tapes such as video tapes, magnetic disks such as floppy disks, magnetic cards such as telephone cards and prepaid cards), electronic materials, graphic materials, plate making films, OHP films, packaging materials, process materials, etc. The present invention relates to a laminated film useful as a material.

[0002]

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

[0003] However, such a polyester film has a disadvantage that it is easily charged, and when the film is charged, there is a problem in that dust and dirt adhere to the surface of the film, causing quality problems. In addition, when an organic solvent is used in the film processing step, there is a problem that discharge from the charged film may cause ignition.

[0004] In order to solve the problem due to such charging, an antistatic coating 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 of the film. A method has been proposed and put into practical use.

As the low molecular weight antistatic agent, for example, a surfactant type anionic antistatic agent such as a long-chain alkyl compound having a sulfonate group (JP-A-4-28728) is known. The polymer type antistatic agent includes a polymer having an ionized nitrogen element in the main chain (JP-A-3-255139, JP-A-Hei.
-288127, JP-A-6-172562) and sulfonate-modified polystyrene (JP-A-5-3).
No. 20390) is known.

However, in such an antistatic coating film using a low-molecular type antistatic agent, the antistatic agent moves in the coating film and accumulates at the interface to change the surface energy of the film. There are problems such as adversely affecting the adhesive properties when a top coat layer such as a magnetic layer, a release layer, and an easily adhesive layer is laminated on the film surface, and a problem that the antistatic property deteriorates with time. On the other hand, in the case of an antistatic coating using a polymer type antistatic agent, a large amount of an antistatic agent may be added to improve antistatic properties, or a thick antistatic coating may be used. It is not economical because it is necessary to form the film, and when a scrap film that does not become a product (for example, an end portion of a film cut and removed from a product) is collected and used as a recycled material for film production, a melted film cannot be formed. In this case, there is a problem that the coating film component contained in the recycled material is thermally degraded, and the obtained film is markedly colored and lacks practicality (recoverability is poor).

On the other hand, these polyester films are usually stored in a rolled state, and when the film is processed or the like, the film is unwound from the roll, and the film is moved in the longitudinal direction at a high speed in the processing step ( It is used while running. However, in a film in which the surface resistivity is simply reduced as in the prior art, it is difficult to suppress the charge (peeling charge) due to peeling of the films when the film is unwound from a roll, and the film is processed by this charge. There is a disadvantage that it is difficult to smoothly run the film in a processing step such as forming wrinkles or cutting in close contact with a roll for use.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art and to improve the anti-peeling property when the film is unwound from a roll, the surface energy stability of the film, and the recoverability of the film. An object of the present invention is to provide an excellent laminated film.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to provide, according to the present invention, at least one side of a polyester film,
The component having a sulfonic acid salt group is copolymerized in an amount of 2 to 20 mol% and the secondary transition point is 70 to 160 ° C. The copolymer component having a phosphoric acid group is contained in an amount of 15 to 100 mol% with respect to 100 parts by weight of the polyester (A). An aqueous coating liquid containing a composition containing 1 to 10 parts by weight of at least one resin (B) selected from the group consisting of acrylic resin, polyester resin, acrylic-modified polyester resin, polyether resin, and vinyl resin, This is achieved by a laminated film provided with a low release chargeable coating film formed by drying and stretching. Hereinafter, the present invention will be described in detail.

[Base Film] In the present invention, a polyester film is used as a base film. The polyester constituting the base film is a linear polyester comprising 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, dodecanedicarboxylic acid and the like. Among them, terephthalic acid and 2,6-naphthalenedicarboxylic acid are particularly preferred.

Examples of the glycol component include ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, and 1,6-hexanediol. , Cyclohexane dimethanol, polyethylene glycol, polytetramethylene glycol, dipropylene glycol, triethylene glycol, bisphenol, and the like, with ethylene glycol being particularly preferred.

Among these polyesters, polyethylene terephthalate or polyethylene-2,6-naphthalate is excellent in mechanical properties such as high Young's modulus, and excellent in thermal properties such as heat-resistant dimensional stability. Is preferred.

The above-mentioned polyester may be a polyester obtained by copolymerizing the above-mentioned dicarboxylic acid component or glycol component in order to improve the adhesion between the polyester film and the coating film. 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) may be used.

[0015] Such polyesters can be made by conventional methods. Further, the intrinsic viscosity of the polyester is 0.45
The above is preferable because the mechanical properties such as high rigidity of the film are improved.

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

In addition to the fine particles, a coloring agent, a known antistatic agent, an antioxidant, an organic lubricant, a catalyst, a fluorescent brightener, a plasticizer, a crosslinking agent, a slipping agent, an ultraviolet absorber, and other resins are required. It can be added according to.

The thickness of the polyester film is preferably 1 to 300 μm after stretching. Further, the light transmittance of the polyester film can be adjusted depending on the use of the film. For example, for applications requiring transparency, a polyester film having a light transmittance of 80% or more after stretching can be used.

The polyester film used in the present invention comprises:
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 form 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 at the secondary transition point (T
g) Preferably, the stretching is performed at a higher temperature by stretching at least twice, and more preferably at least three times in each direction. At this time, the area stretching ratio is preferably 8 times or more, more preferably 9 times or more. The upper limit of the area stretching ratio depends on the use of the film, but is preferably 35 times, and more preferably 30 times. After the stretching, heat treatment may be performed to complete the oriented crystallization.

[Copolymer Polyester (A)] The copolymer polyester (A) used in the present invention is a linear polyester comprising a dicarboxylic acid component and a glycol component, and a component having a sulfonate group is contained in an amount of 2 to 2 per total acid component. It is a copolymerized polyester having a secondary transition point of 70 to 160 ° C., copolymerized by 20 mol%.

As the dicarboxylic acid component, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 4,4 '
-Diphenyldicarboxylic acid, adipic acid, sebacic acid,
Preferred examples include dodecanedicarboxylic acid, hexahydroterephthalic acid, and phenylindanedicarboxylic acid, and the glycol component is ethylene glycol.
Diethylene glycol, propylene glycol, 1,3
-Propanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6
Preferred examples include -hexanediol, dipropylene glycol, triethylene glycol, bisphenol A-alkylene oxide adduct, hydrogenated bisphenol A-alkylene oxide adduct, and polyethylene glycol.

The component having a sulfonate group used in the copolymerized polyester (A) is a dicarboxylic acid component having a sulfonate group or a glycol component having a sulfonate group, for example, 5-Na sulfoisophthalic acid,
5-K sulfoisophthalic acid, 5-Na sulfoterephthalic acid, 5-Li sulfoterephthalic acid, 5-tributylphosphonium sulfoisophthalic acid, 1-Na sulfosuccinic acid, 3,3'-di-K sulfobisphenol A ethylene oxide adduct And the like.

The copolymerization ratio of the component having a sulfonate group is 2 to 20 mol% based on the total acid component, and even if only the dicarboxylic acid component having a sulfonate group or only the glycol component having a sulfonate group is used. Alternatively, both components (the sum of both components is 2 to 20 mol% based on the total acid component) may be used. If this ratio is less than 2 mol%, the dispersibility of the copolymerized polyester (A) in the aqueous liquid will be insufficient, and if it exceeds 20 mol%, the wet heat resistance will be reduced.

The secondary transition point of the copolymerized polyester (A) is from 70 to 160 ° C., preferably from 70 to 110 ° C. When the secondary transition point is lower than 70 ° C., the blocking resistance of the laminated film is inferior. When the secondary transition point is higher than 160 ° C., the low peeling chargeable coating film is easily shaved. Incidentally, the copolymerized polyester having a secondary transition point of 70 to 160 ° C. uses an aromatic dicarboxylic acid as a main component as a dicarboxylic acid component,
The glycol component can be obtained by selecting the secondary transition point so as to fall within the above range.

The average molecular weight of the copolymerized polyester (A) is preferably from 5,000 to 40,000, since the strength of the low-peelable chargeable coating film is improved.

[Resin (B)] The resin (B) is an acrylic resin, a polyester resin, an acryl-modified polyester resin, an acrylic resin containing a component having a phosphate group in a proportion of 15 to 100 mol%, preferably 40 to 100 mol%. At least one resin selected from the group consisting of ether resins and vinyl resins.

The phosphate group is a group having a structure represented by the following formula (I-1) or (I-2).

[0028]

-OP (= O) (OM) ₂ ... (I-1) -OP (= O) (OM) (OR) ... (I-2) In the above formula, M is a monovalent Metal element, R is H, carbon number is 1
Or a group having a structure represented by the following formula (I-3).

[0029]

Embedded image-(CHR ¹ CHR ² O) n—H (I-3) In the above formula, R ¹ and R ² are H or CH ₃ , and n is 1 to 50.
It is an integer of 0.

The saturated hydrocarbon group having 1 to 30 carbon atoms is preferably, for example, a methyl group, an ethyl group, an n-butyl group, a decyl group, a lauryl group, and a stearyl group.
M is preferably Na or K.

[Acrylic Resin] The acrylic resin is an acrylic component having a phosphate group in an amount of 15 to 100.
It is an acrylic polymer or a copolymer containing mol% (preferably 40 to 100 mol%). Examples of the acrylic component having a phosphate group include the following formulas (II-1) and (II)
This is a component of the structure represented by -2).

[0032]

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In the formulas (II-1) and (II-2), R ¹ and R ² are H or CH ₃ , R ³ is an alkylene group having 2 to 6 carbon atoms, and M is a monovalent metal element. , R ⁴ is H or a carbon number of saturated hydrocarbon group having 1 to 30. Examples of such components are shown in the following formula (II-3).

[0034]

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The acrylic resin includes, for example, methyl methacrylate, ethyl acrylate, acrylic acid, sodium acrylate, acrylamide, glycidyl methacrylate,
It may contain a copolymer component obtained by copolymerizing an acrylic monomer such as -hydroxyethyl acrylate or N-methylolacrylamide. Further, styrene, α-methylstyrene, sodium styrene sulfonate,
It may contain a copolymer component obtained by copolymerizing monomers such as vinyl chloride, vinylidene chloride, vinyl acetate, vinyl ether, sodium vinyl sulfonate and sodium methacrylate.

[Polyester Resin] The polyester resin described above is a polyester comprising a dicarboxylic acid component and a glycol component, wherein the dicarboxylic acid component having a phosphate group and / or the glycol component is the sum of both components and is based on the total acid component. 15-100 mol% (preferably 40-1
(00 mol%).

The dicarboxylic acid component having a phosphate group is, for example, a component having the structure represented by the following formula (III-1) or (III-2). (IV-1), a component having a configuration represented by the formula (IV-2).

[0038]

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[0039]

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However, in the formulas (III-1), (III-2), (IV-1) and (IV-2), M is a monovalent metal element and R ⁴
Is H or a saturated hydrocarbon group having 1 to 30 carbon atoms, and R ⁵ is a trivalent hydrocarbon group having 3 to 12 carbon atoms.

Examples of such components are shown in the following formulas (III-3) and (IV-3).

[0042]

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The dicarboxylic acid component used as a copolymer component includes, for example, terephthalic acid, isophthalic acid,
Examples thereof include dicarboxylic acids such as 2,6-naphthalenedicarboxylic acid and adipic acid. Examples of the glycol component include ethylene glycol, diethylene glycol, and neopentyl glycol.
Further, as a copolymerization component, a trifunctional or higher-functional polyvalent compound (for example, a polyvalent carboxylic acid such as trimellitic acid or a polyvalent glycol such as glycerin) is used in a small amount (for example, 5 moles) as long as the polyester becomes substantially linear. % Or less).

[Acrylic-modified polyester resin] The above-mentioned acryl-modified polyester resin refers to ethyl acrylate, methyl acrylate,
Acrylic acid, butyl acrylate, sodium acrylate, ammonium acrylate, ethyl methacrylate, methyl methacrylate, methacrylic acid, butyl methacrylate, glycidyl methacrylate, 2-hydroxyethyl acrylate, acrylamide, methacrylamide, N-methoxymethylacrylamide , A copolymer produced by polymerizing an acrylic monomer represented by N-methylolacrylamide and / or an acrylic monomer having a phosphate group, and having no phosphate group in the molecule It may be a copolymer produced by polymerizing an acrylic monomer having a phosphate group in the presence of a polyester polymer or a copolymer.

The polymerization ratio of the component having a phosphate group of this acrylic-modified polyester resin is 15 to 100 mol% (preferably 40 to 100 mol%) as the ratio of the unit having a phosphate group to the total of the polyester unit and the acrylic unit. ).

[Polyether resin] The polyether resin is 15 to 100 mol% (preferably 40 to 10 mol%) of the hydroxyl group of the polymer or copolymer having an ether bond.
(0 mol%) is a polymer or copolymer modified with a component having a phosphate group. Examples of the polymer or copolymer having an ether bond include a phenoxy resin, and the component having a phosphate group includes, for example, a group having a hydroxyl group of -OP (= O) (OM) ₂ or -OP
A component substituted with a (成分 O) (OM) (OR) group can be exemplified.

[Vinyl Resin] The vinyl resin has a polymerization ratio of a vinyl component having a phosphate group of 15 to 15.
The polymer or copolymer is 100 mol% (preferably 40 to 100 mol%). The vinyl component having a phosphate group includes, for example, the following formulas (V-1) and (V-
It is a component of the structure shown in 2).

[0048]

Embedded image

However, in the formulas (V-1) and (V-2), R ¹ and R ² are a hydrogen element or CH ₃ , M is a monovalent metal element, R ⁴ is a hydrogen element or a compound having a carbon number of 1 to 1. 30 saturated hydrocarbon groups. Examples of the vinyl component having a phosphate group in the molecule are shown in the following formulas (V-3) and (V-4).

[0050]

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The vinyl components include, for example, polyvinyl alcohol, modified polyvinyl alcohol, vinyl acetate,
It is a component such as maleic acid, methyl vinyl ether and methyl vinyl ketone.

[Other Resins] In the composition of the present invention, a small amount (for example, 10% by weight or less) of a polyurethane resin, an epoxy resin, a water-soluble resin or the like can be added in addition to the resin (B).

[Low Release Charging Coating] The low release charging coating according to the present invention comprises 100 parts by weight of the copolymerized polyester (A) and 1 to 10 parts by weight, preferably 2 to 8 parts by weight of the resin (B). Apply an aqueous coating solution containing a composition containing
It is made by drying and stretching. When the amount of the resin (B) is less than 1 part by weight, the effect of suppressing peeling chargeability is insufficient, and the adhesion of the low peeling chargeable coating film with the base film exceeding 10 parts by weight,
The abrasion resistance of the coating film decreases.

[Aqueous coating liquid] In the present invention, an aqueous coating liquid containing the above-mentioned composition is used to coat a low-peelable electrification coating film. In order to improve the blocking resistance of the film, a lubricant can be added. As such a lubricant,
For example, fine particles of polystyrene resin, acrylic resin, melamine resin, silicone resin, fluorine resin, urea resin, benzoguanamine resin, polyamide resin, polyester resin, and the like can be given. The fine particles of these resins may be thermoplastic or thermosetting as long as they are contained in the form of fine particles in the low-peelable charging coating film.

The aqueous coating liquid may further contain, as other components, a surfactant, an antioxidant, an antistatic agent, a colorant, a pigment, a fluorescent brightener, a plasticizer, a crosslinking agent, a slipping agent (such as a slippery agent such as wax). And a UV absorber.

The solid content of the aqueous coating solution is 1 to 30% by weight.
, And 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. Also,
The aqueous coating liquid may contain a small amount of a solvent.

[Coating of Coating Film] In the present invention, the water-based coating solution is applied to at least one surface of the polyester film, and then dried and heated and stretched to form a low-peelable charging coating film. As a 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 Meyer bar coating method, and a roll coating method. A brush method, a spray coat method, an air knife coat method, an impregnation method, a curtain coat method, or the like can be applied alone or in combination. The amount of WET of the aqueous coating liquid is the running film 1.
The amount is preferably 1 to 20 g, particularly preferably ^{2 to} 12 g per m ² . It is preferable that the coating amount is in this range because drying becomes easy and coating unevenness hardly occurs.

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 melting a polyester by heating and forming a film as it is; an unstretched film in a 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 (more stretchable). Or a biaxially stretched film in which an unstretched film is simultaneously stretched in two directions (longitudinal and transverse) (further stretchable); a biaxially stretched film is heat-set and / or thermally relaxed (further stretchable) A biaxially stretched heat treatment film can be used.

The thickness of the polyester film is preferably 10 to 1000 μm for an unstretched film, 2 to 500 μm for a uniaxially stretched film, and 1 to 300 μm for a biaxially stretched film and a biaxially stretched heat-treated film.

When the aqueous coating liquid is applied to a uniaxially stretched film among the polyester films, particularly to a longitudinally uniaxially stretched film, the adhesiveness of the coating film becomes strong and a laminated film can be manufactured efficiently. preferable. For example, the polyester is hot-melted, extruded into a sheet and cooled to form an unstretched film, and the unstretched film is stretched in the longitudinal direction to form a uniaxially stretched film. Then, if necessary, the film is re-stretched in the vertical and horizontal directions, and then heat-treated to produce a laminated film coated with a low-peelable charging coating.

The thickness of the applied coating film is 0.01 to 0.1 μm.
m, particularly preferably 0.015 to 0.08 μm. If the thickness of the coating film is less than 0.01 μm, the effect of suppressing peeling electrification may be insufficient, and if it exceeds 0.1 μm, the coating film surface may be rough or easily shaved, which is not preferable.

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

[Laminated Film] The laminated film of the present invention can be made into a transparent laminated film having a light transmittance of 60% or more or a white laminated film having a light transmittance of less than 60% depending on the application. Use a polyester film having a light transmittance of 60% or more for the base film of the transparent laminated film, and use a white polyester film having a light transmittance of less than 60%, particularly 30% or less for the base film of the white laminated film. Is preferred.

A white laminated film using a white polyester film as a base film is particularly preferably used for a magnetic card. In addition, the magnetic card referred to here is, for example, a card in which a magnetic recording layer is provided on one side of an antistatic film and a picture layer or the like is printed on the other side with UV ink or the like. 100-300
μm, especially 180 to 250 μm is preferably used.

[0065]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. Each characteristic value was measured by the following method. The average molecular weight in the examples means a weight average molecular weight.

1. Peeling electrification amount (peeling electrification resistance) Wound in a roll shape 1,000 mm, length 3,400 m
Was adjusted to a temperature of 20 ° C. and a humidity of 50% RH, and then the amount of peeling charge when the film was taken out from the roll at a speed of 75 m / min was measured with a potentiometer (Model 203 manufactured by Hugle Co., Ltd.). The peeling charge amount is about 10c from the film peeling position (the position where the film wound in a roll is peeled off from the roll and taken out) in the running direction of the film.
about 50mm from the surface of the film running at a distance of m
The measurement was performed with the detection end of the electrometer installed at a remote position. evaluated. A: Peeling charge amount is less than 1.5 KV (peeling charge resistance is particularly good) B: Peeling charge amount is 1.5 KV or more and less than 2.0 KV (peeling charge resistance is good) C: Peeling charge amount is 2. 0 KV or more (Practical problem due to poor peeling electrification resistance)

2. Surface energy (surface energy retention
E) Surface energy is E⁰dyne / cm blank film
One side of a polyester film without a film
5 kg / cm ^TwoLoad
In an atmosphere of 55 ° C. and 70% RH for 20 hours
After holding, peel off, sample film of blank film
Surface energy (E¹dyne / cm)
Surface energy from the measurement results obtained according to the following criteria.
Gee retention was evaluated. A: E¹/ E⁰≧ 0.950 (Surface energy
B: 0.950> E¹/ E⁰≧ 0.925 (Surface energy
C: 0.925> E¹/ E⁰ (Surface energy
Energy retention failure) The surface energy was measured according to JIS-K6768-19.
The wettability index was measured and determined according to the wettability test method No. 77.

3. Degree of coloring (film recoverability) A polyester film without a coating film was pulverized and melted at about 300 ° C with an extruder to form chips. Next, a melt film was formed using the obtained chip, and a biaxially stretched blank film having a thickness of 9 μm was prepared. On the other hand, the sample film coated with the coating film was pulverized,
And melted into chips. Next, a melt film was formed in the same manner using the obtained chip, and a biaxially stretched regenerated film having a thickness of 9 μm was prepared. The degree of coloring of the recycled film was compared with the degree of coloring of the blank film, and the sample film was evaluated according to the following criteria. Rank A: The degree of coloring is comparable to that of a blank film (good recoverability) Rank B: The film is slightly colored (slightly good recoverability) Rank C: The degree of coloring of the film is large and lacks practicality (poor recoverability)

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.62 was melted and cast on a cooling drum to obtain an unstretched film.
And stretched 3.5 times in the machine direction to obtain a uniaxially stretched film. Then, 11 mol% of terephthalic acid, 2 mol% of isophthalic acid, 67 mol% of 2,6-naphthalenedicarboxylic acid, 9 mol% of 4,4'-diphenyldicarboxylic acid and 5 mol% of
A copolymer polyester obtained using 11 mol% of -Na sulfoisophthalic acid, 85 mol% of ethylene glycol as a glycol component, 1 mol% of diethylene glycol, 2 mol% of neopentyl glycol and 12 mol% of 1,4-cyclohexanedimethanol ( A1: Tg = 82 ° C.
(Average molecular weight = 19,670) 84% by weight, ethyl acrylate component 3% by mole, ethyl methacrylate component 14% by mole
And component represented by formula _{(II-3) (-CH 2} CH-
(COO (CH ₂ ) ₃ ) OP (＝ O) (ONa) (OC
₁₅ H ₃₁ )) 79 mol% of copolymer (B1: average molecular weight 1)
An aqueous coating solution of 3% by weight of a composition comprising 5% by weight of 2,600) and 11% by weight of polyoxyethylene nonylphenyl ether (C1) was applied by a gravure coater. Next, after drying at 102 ° C., the film was stretched 3.8 times in the transverse direction at 106 ° C. and heat-treated at 233 ° C. to obtain a laminated film having a total thickness of 12 μm and a coating thickness of 0.02 μm. Table 1 shows the characteristics of this film.

[Examples 2 to 12 and Comparative Examples 1 to 5] In the same manner as in Example 1 except that the types and the amounts of the copolymers or the compounds and the thickness of the coating film were changed as shown in Table 1. A laminated film was obtained. Table 1 shows the characteristics of these films.

[0071]

[Table 1]

In Table 1, [B2], [B3], [B
4], [B5], [B6], [B7], [B8], [B
9] and [B10] represent the following copolymers or compounds.

[B2]: 54 mol% of terephthalic acid, 42 mol% of isophthalic acid and 5-N
a Copolymer (average molecular weight) of 4 mol% of sulfoisophthalic acid, 11 mol% of ethylene glycol as a glycol component, 10 mol% of diethylene glycol, 2 mol% of neopentyl glycol and 77 mol% of the component represented by the formula ( IV-3 ) : 19,670) [B3]: 16 mol% of a styrene component, 5 mol% of a vinyl alcohol component, and a component represented by the formula (V-3) (−
_{CH 2 CH- (OP (= O} ) ONa) (OC 12 H 25))
79 mol% of copolymer (average molecular weight: 17,900) [B4]: 4 mol% of an ethyl acrylate component, 34 mol% of an ethyl methacrylate component and 62 mol% of the component represented by the formula (II-3) Copolymer (average molecular weight: 16,70
0) [B5]: a copolymer of 6 mol% of the ethyl acrylate component, 43 mol% of the ethyl methacrylate component and 51 mol% of the component represented by the formula (II-3) (average molecular weight: 15,50)
0) [B6]: A copolymer of 7 mol% of an ethyl acrylate component, 61 mol% of an ethyl methacrylate component, and 32 mol% of the component represented by the formula (II-3) (average molecular weight: 14,20)
0) [B7]: 100% by mole of a component represented by the formula (II-3) (average molecular weight: 6,310) [B8]: 11% by mole of ethyl acrylate component, 79% by mole of ethyl methacrylate component And a copolymer of 10 mol% of the component represented by the formula (II-3) (average molecular weight: 18,9
00) [B9]: C ₁₁ H ₂₃ SO ₃ Li [B10]: Polymer of a repeating unit represented by the following formula (VI-1) (average molecular weight: 16,800)

[0074]

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[0075]

The laminated film of the present invention is excellent in anti-peeling charge resistance when the film is unwound from a roll, surface energy stability of the film, and recoverability of the film, magnetic recording media such as a magnetic card, and packaging. It is useful for materials, photographic materials, graphic materials, plate making films, OHP films and the like.

Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 27/00-27/42 C08J 7/04

Claims (2)

(57) [Claims] 1. A method according to claim 1, wherein at least one side of the polyester film is copolymerized with 2 to 20 mol% of a component having a sulfonate group and has a secondary transition point of 70 to 160.degree. At least one selected from the group consisting of acrylic resins, polyester resins, acrylic-modified polyester resins, polyether resins, and vinyl resins containing 15 to 100 mol% of a component having an acid base.
A laminated film provided with a low-peelable electrification coating film obtained by applying an aqueous coating solution containing a composition containing 1 to 10 parts by weight of a resin (B), drying and stretching. 2. The polyester film has a thickness of 2 to 25.
μm, the thickness of the low peel electrification coating film is 0.01 to 0.1 μm
The laminated film according to claim 1, wherein the laminated film is used for a magnetic recording medium further provided with a magnetic layer on at least one surface thereof.