JPH0855334A - Magnetic recording card - Google Patents

Abstract

PURPOSE:To improve durability and to enhance the yield of products by separately forming a magnetic recording layer and a printed layer on both sides of a white polyester film through laminated films having prescribed antistatic performance and adhesiveness respectively. CONSTITUTION:Laminated films are formed on both sides of a white polyester film made of polyethylene terephthalate or polyethylene-2,6-naphthalate. An antistatic polymer having crosslinkable functional groups such as carboxyl, hydroxyl, methylol, sulfone, amido, methylolamido, amino, alkylolamino, epoxy and acid anhydride is polymerized so that a phosphate is allowed to exist in each side chain through alkylene oxide. Each of the laminated films contains 10-70wt.% of the resultant antistatic polymer and has such antistatic performance as <=5X10<12>OMEGA/sq. surface specific resistance at 23 deg.C and 65% relative humidity, >=50 deg.C contact angle to water and satisfactory adhesiveness to a magnetic recording layer and the ink of a printed layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording card using a polyester film as a base material, specifically a cash card, various credit cards, a magnetic ticket, a telephone card, a POS card, a hospital medical care card, an electronic card. The present invention relates to a magnetic recording card used as a range cooking card, an ID card, or the like.

[0002]

2. Description of the Related Art Conventionally, as a magnetic recording card, (1)
A laminated body having a magnetic recording layer, a white polyester film layer, and a printing layer provided as necessary in this order,
Alternatively, (2) a laminated body further provided with an easy-adhesion layer such as urethane or acrylic between the polyester film and each layer for imparting durability to the magnetic recording layer or the printing layer, or (3) dust during processing In order to improve the reduction in yield due to the adhesion of the above, a polyester film or an easy-adhesion layer to which various surfactants and antistatic agents have been added to give an antistatic property is used.

[0003]

However, the above magnetic recording card has the following problems. That is,
In the case of (1), the adhesiveness between the layers is not sufficient, so that the durability is remarkably lacked, and in the case of (2), the adhesiveness is considerably improved and the durability is considerably improved, but foreign matter such as dust is In the case of (3), the product yield is improved because foreign substances such as dust are hardly attracted in the processing process, but the product yield is improved, but the adhesiveness is greatly reduced and durability There is a drawback that the sex deteriorates.

The present invention solves these problems and improves durability,
It is an object of the present invention to provide a magnetic recording card having excellent product yield.

[0005]

The present invention provides a magnetic recording card having a magnetic recording layer on one side of a white polyester film and a printing layer on the other side, each layer being at 23 ° C. Surface resistivity at 5% humidity is 5
× 10 ¹² Ω / □ or less, and the contact angle with water is 50
The essence is that it is provided through a laminated film having a number of degrees or more.

The polyester in the present invention is a general term for polymers having an ester bond as a main chain, and preferred polyester is ethylene terephthalate.
Ethylene-2,6-naphthalate, ethylene-α, β-
Mainly contains at least one structural unit selected from bis (2-chlorophenoxy) ethane-4,4′-dicarboxylate and ethylene-α, β-bis (phenoxy) ethane-4,4′-dicarboxylate units. Examples thereof include constituents.

Further, other components than the above may be copolymerized within the range not hindering the present invention, preferably within 10 mol%. Among these, polyethylene terephthalate (hereinafter polyethylene terephthalate is abbreviated as PET) when comprehensively considering quality, economy, etc.
Is particularly preferable. Further, in the case where heat is applied to an image receiving sheet for recording information such as electrophotography, or a base material such as various prints, polyethylene-2,6-
It is preferable to use naphthalate (hereinafter, polyethylene-2,6-naphthalate is abbreviated as PEN) in terms of flatness after recording.

The white polyester film in the present invention contains the above composition as a main component, but various polymers may be blended within a range not impairing the object of the present invention.
Further, inorganic or organic additives such as antioxidants, heat stabilizers, lubricants, ultraviolet absorbers, nucleating agents and the like may be added to the extent that they are usually added.

The white polyester film of the present invention is not particularly limited as long as it is a white polyester film, but preferably has an optical density of 0.5 or more and a whiteness of 8
It is preferably 0% or more. Whiteness of 85 to 15
0, preferably 90-130, with an optical density of 0.9
˜5.0, preferably 1.2 to 3.0 is suitable. This is because the transparent polyester film is not preferable because the coloring by the magnetic recording layer is transmitted and the appearance of the printed layer on the surface is impaired.

A method for obtaining such optical density and whiteness is
Although it is not particularly limited, it can be usually obtained by incorporating inorganic particles or a resin incompatible with polyester. The content is not particularly limited, but in the case of inorganic particles, it is 5 to 35% by weight, preferably 8 to 25% by weight.
On the other hand, in the case of containing an incompatible resin, the content is 5 to 35% by volume, preferably 8 to 25% by volume.

The inorganic particles used are not particularly limited,
The average particle size is 0.1 to 4.0 μm, preferably 0.3 to 1.
Representative examples thereof include inorganic particles of 5 μm. Specifically, barium sulfate, calcium carbonate, calcium sulfate, titanium oxide, silica, alumina, talc,
Clay or the like or a mixture thereof, and these inorganic particles may be used in combination with other inorganic compounds such as calcium phosphate, titanium oxide, mica, zirconia, tungsten oxide, lithium fluoride, calcium fluoride and the like. Further, among the above-mentioned inorganic particles, it is more preferable to use one having a Mohs hardness of 5 or less, preferably 4 or less, because the whiteness is further increased.

The resin which is incompatible with the polyester is not particularly limited, but in the case of mixing with polyethylene terephthalate or polyethylene-2,6-naphthalate, for example, acrylic resin, polyethylene, polypropylene, modified olefin resin, polybutylene. Examples thereof include terephthalate-based resin, phenoxy resin, polyphenylene oxide, and, of course, they may be used in combination with the above-mentioned inorganic particles. In particular, a white polyester film having a specific gravity of 0.5 to 1.3 g / cm ³ which has a void inside and is mixed with a resin incompatible with inorganic particles or polyester and biaxially stretched has good printability. Therefore, it is preferable.

The thickness of the white polyester film is not particularly limited, but in this application, it is 75 to 1000 μm,
The thickness is preferably 100 to 500 μm.

In the present invention, the laminated film provided on both sides of the white polyester film has a temperature of 23 ° C. and a relative humidity of 65.
% Of 5 × 10 ¹² Ω / □ or less, preferably 1 × 10
^It has an antistatic property of ¹² Ω / □ or less, more preferably 5 × 10 ¹¹ or less, and has a contact angle with water of 50 ° or more, preferably 60 ° or more, more preferably 70 ° or more. If the surface resistivity exceeds 5 × 10 ¹² Ω / □, the antistatic effect is small, and dust is likely to adhere to the surface during printing and other processes, resulting in a high possibility of printing defects. When the contact angle with water is less than 50 degrees, the adhesiveness to various coatings on the laminated film, for example, a magnetic recording layer, a UV curable ink which is a printing layer, an oxidation polymerization type ink, etc., is insufficient. Will be enough.

In order to obtain such a laminated film, it is usually difficult to achieve it by using an antistatic polymer which does not have a reactive functional group or which is easily deposited on the surface, such as a conventional surfactant, and the crosslinkability is high. Antistatic polymers with functional groups are preferred. As the antistatic polymer, a monomer (monomer) having a sulfonic acid group and / or a salt thereof or a phosphoric acid group and / or a salt thereof, a monomer (monomer) having a reactive (crosslinkable) functional group, and other monomers. Those copolymerized with the component (monomer) are preferable.

Typical examples of the monomer include styrene sulfonic acid and / or a salt thereof (as a salt, ammonium, lithium, sodium, potassium, etc.) and a monomer having one unsaturated bond and a phosphate group. Can be mentioned as.

Particularly preferred is a monomer containing an alkylene oxide and a phosphoric acid group and / or a salt thereof, and among them, the alkylene oxide and a phosphoric acid group and / or a salt thereof are 1
It is preferably present in one monomer, and more preferably, the phosphate group is present in the side chain of the polymer through an alkylene oxide after the polymerization.

Here, alkylene oxide means (1)
It is a repeating unit in the molecule represented by the formula, and preferable examples include ethylene oxide, propylene oxide, and those containing both ethylene oxide and propylene oxide.

-(R-O) n- (1) (R: alkyl group and its derivative, n: an integer selected from 1 to 9) Further, the phosphate group is formed by addition of a cation. The cations are preferably monovalent ones such as lithium salts, sodium salts, potassium salts, rubidium salts and ammonium salts, among which potassium salts and rubidium salts have antistatic properties. Especially desirable in terms. The phosphate group can be obtained by, for example, a method in which a cation is added to a free phosphate group after copolymerization, or a monomer having a phosphate group is phosphated by a neutralization method in advance and used as one component of the monomer. be able to.

Examples of the monomer having a phosphoric acid group present through such an alkylene oxide include acid phosphooxyethyl acrylate, acid phosphooxyethyl methacrylate, acid phosphooxypropyl acrylate, acid phosphooxypropyl methacrylate and acid phospho. Oxy (polyoxyethylene glycol) monoacrylate, acid phosphooxy (polyoxyethylene glycol) monomethacrylate, acid phosphooxy (polyoxypropylene glycol) monoacrylate, acid phosphooxy (polyoxypropylene glycol) monomethacrylate, 3chloro-2 acid Phosphooxypropyl acrylate, 3
Typical examples thereof include chloro-2 acid phosphooxypropyl methacrylate.

Further, for the purpose of imparting a crosslinkable functional group, it is important to copolymerize the following monomers having a crosslinkable functional group (monomer) in order to satisfy the requirements of the present invention.
Examples of such a crosslinkable functional group include a carboxyl group, a hydroxyl group, a methylol group, a sulfonic acid group, an amide group or a methylolated amide group, an amino group (including a substituted amino group), or an alkylolated amino group. Examples thereof include a hydroxyl group, an epoxy group, an acid anhydride, and the like.

As an example of the above monomer, acrylic acid,
Methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, vinylsulfonic acid, styrenesulfonic acid, acrylamide, methacrylic acid Examples thereof include amide, N-methylmethacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, dimethylaminoethylmethacrylate, and those obtained by methylating the above amino group, glycidyl acrylate, glycidyl methacrylate, etc., but are not limited thereto. It is not something that will be done.

The copolymerization ratio of the above monomers is not particularly limited, but is preferably 1 to 30% by weight, more preferably 3 to.
20 wt% is desirable from the viewpoint of easy adhesion.

As the other monomer component (monomer), known ones can be used. In particular, alkyl acrylate, alkyl methacrylate (as the alkyl group, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, 2-
Acrylic monomers such as ethylhexyl group, lauryl group, stearyl group, cyclohexyl group, phenyl group, benzyl group, phenylethyl group) are preferably used as the basic skeleton.

The above-mentioned monomer and another monomer (monomer) can be copolymerized at any ratio, but preferably the above-mentioned monomer is 20% by weight or more, more preferably 30% by weight or more, further preferably 40% by weight or more. It is desirable from the viewpoint of antistatic property.

In addition to the above compounds, the following compounds such as acrylonitrile, methacrylonitrile, styrenes, mono- or dialkyl esters of maleic acid and itaconic acid, vinyl chloride, vinylidene chloride, vinyl acetate, vinyl pyridine, vinyl pyrrolidone, Alkoxysilane having a vinyl group may be partially used as a copolymerization component of the antistatic polymer.

The molecular weight of the antistatic polymer is preferably 100,000 or more, and more preferably 300,000 or more in terms of easy adhesion.

The antistatic polymer can be obtained by a known acrylic resin polymerization method, but when it is applied to the in-line coating method, it is preferably dissolved or dispersed in water. A water dispersion made by the method is preferred.

In the present invention, in order to satisfy the requirement, it is preferable to use the above-mentioned antistatic polymer in a mixture with another resin from the viewpoint of easy adhesion. The resin to be mixed is not particularly limited, and examples thereof include acrylic resin, polyester resin, polyurethane resin, polyamide resin, and polyester graft acrylic resin. Among these, like the above-mentioned antistatic polymer, those having a crosslinkable functional group are preferable from the viewpoint of easy adhesion, and the above-mentioned copolymers of acrylic monomers are particularly preferable. An example of a suitable acrylic resin is a copolymer of acrylic monomers having a carboxyl group, a hydroxyl group, a methylol group, etc. as a crosslinkable functional group, wherein the glass transition point of the polymer is 0 to 45 ° C. and the molecular weight is 10,000. The above is desirable. The mixing ratio of the antistatic polymer and the other resin is not particularly limited, but a preferable range is 10 to 70% by weight of the antistatic polymer in the laminated film, and preferably 20 to 70%.
It is 60%, more preferably 30 to 50%.

In the present invention, it is preferable to use a cross-linking agent in combination in order to bring out the effect more remarkably. As the cross-linking agent, known ones such as melamine-based cross-linking agent, isocyanate-based cross-linking agent, epoxy-based cross-linking agent, silane coupling agent and organic titanate compound can be mentioned.

Among these, the melamine-based cross-linking agent is effective in increasing the contact angle with water. Examples of the melamine-based crosslinking agent include those having an imino group, a methylol group, or an alkoxymethyl group as a functional group in one molecule, and among them, a methylolated melamine resin is most preferable. Further, addition of an organic titanate compound, particularly titanium lactate, is effective in terms of antistatic effect. The amount of each of these crosslinking agents added is preferably 1 to 40% by weight, and more preferably 3 to 20% by weight, in the laminated film.

In the present invention, it is necessary that the laminated film is provided on both sides of the white polyester film. That is, it is necessary to provide a laminated film on both the magnetic layer coating surface and the printing layer coating surface.

The thickness of the laminated film is not particularly limited, but in the present invention, it is preferably 0.01 to 2.0 μm, more preferably 0.04 to 1.0 μm, still more preferably 0.06.
Is 0.5 μm.

In order to bring out the effect of the present invention more remarkably, it is preferable to stretch in the state where water is present in the laminated film in the process of stretching after coating, and therefore the concentration of the coating agent may be lowered. It is effective to lower the stretching temperature as long as there is no film breakage, necking stretching, and undried coating film after stretching heat treatment. Specifically, the coating concentration is
0.5 to 10% by weight, preferably 1 to 5% by weight,
Stretching temperature is 85 to 135 ° C, preferably 95 to 130 ° C
Is good.

In the laminated film of the present invention, known additives such as antioxidants, heat resistance stabilizers, weather resistance stabilizers, ultraviolet absorbers, organic lubricants, pigments, etc. are added within the range that does not impair the effects of the present invention. Dyes, organic or inorganic particles, antistatic agents, nucleating agents and the like may be added.

In particular, a biaxially stretched film containing inorganic particles added and blended into the laminated film of the present invention is more preferable because it has improved slipperiness.

Typical examples of the inorganic particles to be added include silica, colloidal silica, alumina, alumina sol, kaolin, talc, mica, calcium carbonate and the like. The average particle diameter of the inorganic particles is preferably 0.01 to 10 μm, more preferably 0.05 to 5 μm, still more preferably 0.08 to 2 μm, and the compounding ratio with respect to the solid content in the laminated film is not particularly limited. 0.05 to weight ratio
8 parts is preferable, and 0.1 to 3 parts is more preferable.

The coating method is a known coating method, for example, reverse coating method, gravure coating method, rod coating method,
Any method such as a die coating method can be used.

The magnetic recording layer in the present invention is not particularly limited, but typical examples thereof include the following. That is, as the magnetic powder, γ-Fe ₂ O ₃ , Cr
O ₂ , Co-γ-Fe ₂ O ₃ and metal powder, and as a binder, vinyl acetate, vinyl resin such as PVC, rubber-based resin such as acrylonitrile / butadiene copolymer, acetyl cellulose, nitro cellulose. Polyurethane resin used in the form of fibrin such as epoxy resin, phenolic resin, monomeric isocyanate, modified isocyanate, urethane prepolymer, blocked isocyanate, etc., and a dispersant, lubricant, carbon added as necessary. Examples thereof include those prepared by blending an antistatic agent, a stabilizer, and a plasticizer.

The printing layer of the present invention is not particularly limited, but a typical example is an ultraviolet curable ink. That is, unsaturated polyester as a resin component, polyfunctional acrylate as a cross-linking component, 2-methyl-1- (4-methylthiophenyl) -2-morpholipropane, diethylaminobenzophenone, etc. as a sensitizer or initiator upon irradiation with ultraviolet rays, Examples of the pigment component include those prepared by mixing carbon black, aluminum hydroxide, aluminum powder and the like.

The method for providing these printing layers is not particularly limited, but known methods such as letterpress, planographic printing, letterpress printing, screen, flatbed, rotary printing, and transfer can be used.

Next, a typical method of manufacturing the magnetic recording card of the present invention will be described, but the method is not limited to this. Laminated films of the above resins are provided on both sides of the white polyester film. The method for providing is not particularly limited, but on a white polyester film having predetermined physical properties,
Corona discharge treatment may be performed in various atmospheres if necessary, and then coating may be performed using a known method such as gravure coating, reverse coating, bar coating, spray coating, or comma coating. At this time, after applying the coating agent to the base film,
Stretching at least uniaxially while drying, heat treatment,
When it is applied in the base film forming process, the toughness and the adhesiveness of the laminated film are further improved, which is preferable. A predetermined magnetic powder and a binder are dispersed on one surface of the laminated film thus obtained using a method such as a ball mill, a vibration mill, an attritor, a homomixer, a sand mill, or a three-roll mill, and then a known method. To apply. Further, a magnetic recording card can be obtained by providing a printing layer on the other surface by offset printing, gravure printing, etc., cutting it into a desired size, and then encoding and inputting it into the magnetic recording layer.

[0043]

[Characteristic Measuring Method and Effect Evaluation Method] The characteristic measuring method and effect evaluating method in the present invention are as follows.

(1) Thickness of coating layer The thickness was determined from a photograph of a cross section of a biaxially oriented polyester film provided with a coating layer, which was obtained using a transmission electron microscope HU-12 manufactured by Hitachi, Ltd. The thickness is 30 in the measurement field of view.
The average value was used.

(2) Surface resistivity After standing for 24 hours in a normal state (23 ° C., relative humidity 65%), a digital ultrahigh resistance / micro ammeter R8 was placed in that atmosphere.
340A (manufactured by Advantest Co., Ltd.) was used and the measurement was performed at an applied voltage of 100V. The unit is Ω / □.

(3) Contact angle with water After standing for 24 hours in a normal condition (23 ° C., relative humidity 65%), a contact angle meter CA-D (manufactured by Kyowa Interface Science Co., Ltd.) was used under the atmosphere. The contact angle was measured using distilled water stored under the same conditions. The measurement used the average value of 10 pieces.

(4) Durability The following four adhesive properties were evaluated, and (⊚) and (∘) were evaluated as good durability.

(A) Adhesiveness-1 (Adhesion between base material film and laminated film) 100 1 mm ² crosscuts were put in the laminated film, and cellophane tape manufactured by Nichiban Co., Ltd. was stuck on it and stuck with a finger. After being strongly pressed, the film was rapidly peeled in the 90 ° direction, and the number of remaining films was used to perform a four-level evaluation.

⊚: 100/100 (remaining number / measured number) ◯: 80/100 or more and less than 100/100 Δ: 50/100 or more and less than 80/100 ×: less than 50/100 (b) Adhesion-2 (Magnetic paint adhesion) Daifella Coat CAD4301 (Dainichi Seika Kogyo Co., Ltd.)
1 part by weight of Sumidule N-75 (Sumitomo Bayer Co., Ltd.) to 100 parts by weight of the product) to prepare a paint having a solid content concentration of 20% by weight, which is applied using a bar coater and dried at 100 ° C. for 5 minutes. did. The adhesion was evaluated by the same method as in the above (a).

(C) Adhesiveness-3 (Adhesion of UV-curable ink) As a UV-curable ink, FLASH DRY (FDO)
L ink (manufactured by Toyo Ink Mfg. Co., Ltd.) was used to coat the laminated film to a thickness of about 1.5 μm by a roll coating method. Then, the irradiation distance is 9 cm with ultraviolet light having an irradiation intensity of 80 W / cm ^2.
It was irradiated and cured for 8 seconds. The evaluation of adhesiveness is the above (a)
The same method was used.

(D) Adhesiveness-4 (Adhesiveness of ultraviolet curable ink mixed with dampening water) To 100 parts by weight of the ultraviolet curable ink of (c) above,
Dampening water (water + isopropyl alcohol (10% by weight) +
30 parts by weight of phosphoric acid adjusted to pH = 5.5) was mixed and kneaded well, and then printed by the same method as in the above (a) and evaluated.

(5) Flatness of Film Regarding the ultraviolet-curable ink laminate coated and cured in the above (c), the flatness of the laminate is placed on a glass plate with the ink side facing up, and the degree of curling is set. It was measured visually and judged according to the following criteria.

⊚: No curl at all, extremely excellent in flatness ○: Slightly curled at the edges, but good Δ: Curl extends to the vicinity of the center ×: Significant curl (6) Optical density Macbeth It was measured using a transmission densitometer TD-504 manufactured by Co., Ltd.

(7) Whiteness Measured according to JIS-L1015.

(8) Ash Test A polyester film provided with a coating layer was rubbed well with an untreated polyester film, and then brought close to well-dried ash of tobacco, and the degree of adhesion of the ash was evaluated according to the following criteria. did.

◯: No adhesion Δ: Slight adhesion X: Significant adhesion

[0057]

EXAMPLES Next, the present invention will be explained based on examples, but the present invention is not necessarily limited to these.

Example 1 PET pellets having an intrinsic viscosity of 0.62, in which 16% by weight of titanium oxide was finely dispersed, were sufficiently vacuum-dried and then fed to a heated extruder at 280 ° C. to form a sheet from a T-shaped die. I pushed it out. This sheet was wound around a mirror drum having a surface temperature of 50 ° C. and cooled and solidified to prepare an unstretched PET film. This PET film was stretched 3.5 times in the longitudinal direction while passing through a heating roll group at 90 ° C. to obtain a uniaxially oriented film. Both sides of this film were subjected to corona discharge treatment, and the treated surface was coated with the following water-based coating agent.
After application, continuously grip the end with a clip and
2. Lead to the heating zone at ℃, preheat and dry, then 3.
The film is stretched 5 times, and further heat-treated while being relaxed by 5% in a heating zone of 200 ° C. so that the thickness of the base PET film is 190 μm.
m, and the coating thickness was 0.1 μm to obtain a laminated biaxially oriented PET film.

"Water-based coating agent 1" (A): Acid phosphooxy (polyoxyethylene glycol) monomethacrylate (number of repeating units of oxyethylene glycol n) neutralized with potassium hydroxide in advance
= 5) / butyl acrylate / acrylic acid 70/25
Aqueous dispersion of antistatic polymer having a molecular weight of about 150,000, which was emulsion-polymerized at a ratio of / 5 (% by weight) (B): methyl methacrylate / butyl acrylate /
Acrylic emulsion copolymerized with acrylic acid at a ratio of 55/35/10 (% by weight): hexamethylolated melamine (A) / (B) / (C) in a solid content weight ratio of 35/55 /
Mixing with 10 and further diluting with water to make a 3 wt% liquid.

A magnetic coating was applied to one surface of the film to form a magnetic layer, and then an ultraviolet curable ink was applied to the opposite surface of the film for printing. The magnetic recording card thus obtained was evaluated.

The results are shown in Table 1.

Examples 2 to 6 and Comparative Examples 1 to 3 Magnetic recording was performed in the same manner as in Example 1 except that the mixing ratio of (A) / (B) / (C) was changed as shown in Table 1. I made a card. The results are shown in Table 1.

Comparative Example 4 A magnetic recording card was prepared in the same manner as in Example 1 except that the sodium salt of polystyrenesulfonic acid (molecular weight 50,000) was used in place of the aqueous dispersion component (A) of Example 1. . Table 2 shows the results.

Example 7 Example 1 was repeated except that the aqueous dispersion component (A) of Example 1 was replaced with ammonium styrenesulfonate / ethyl acrylate / acrylic acid (65/30/5 (wt%)).
A magnetic recording card was prepared in the same manner as in. Table 2 shows the results.

Comparative Example 5 A magnetic recording card was prepared in the same manner as in Example 1 except that sodium dodecylbenzenesulfonate was used in place of the water dispersion component (A) of Example 1. Table 2 shows the results.

Comparative Example 6 An antistatic polymer prepared by using acid phosphooxy (polyoxyethylene glycol) monomethacrylate not neutralized with potassium hydroxide in place of the water dispersion component (A) of Example 1. Example 1 except that an aqueous dispersion was used
A magnetic recording card was prepared in the same manner as in. Table 2 shows the results.

Example 8 A magnetic recording card was prepared in the same manner as in Example 1 except that PET was changed to PEN. Table 2 shows the results.

[0068]

[Table 1]

[Table 2]

[0069]

INDUSTRIAL APPLICABILITY The magnetic recording card obtained by the present invention exhibits excellent effects on product yield and durability.

Claims (6)

[Claims] 1. A magnetic recording card in which a magnetic recording layer is provided on one side of a white polyester film and a printing layer is provided on the other side, and each layer has a temperature of 23 ° C. and a relative humidity of 65.
% Of the surface specific resistance is 5 × 10 ¹² Ω / □ or less, and the magnetic recording card is provided via a laminated film having a contact angle with water of 50 ° or more. 2. The magnetic recording card according to claim 1, wherein the polyester film is a polyethylene terephthalate film or a polyethylene-2,6-naphthalate film. 3. The magnetic recording card according to claim 1, wherein the laminated film contains an antistatic polymer having a crosslinkable functional group. 4. The magnetic recording card according to claim 3, wherein the antistatic polymer having a crosslinkable functional group is a polymer having a phosphate group with a side chain alkylene oxide interposed. 5. The magnetic recording card according to claim 3, wherein the content of the antistatic polymer having a crosslinkable functional group in the laminated film is 10% by weight or more and 70% by weight or less. 6. The magnetic recording card according to claim 3, wherein the laminated film contains a melamine-based crosslinking agent.