JP3017681B2 - Magnetic card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic card suitable for sublimation thermal transfer recording using a polyethylene terephthalate film as a base material for cards, especially commuter passes and various prepaid cards.

[0002]

2. Description of the Related Art In a sublimation thermal transfer recording system, a sublimation ink ribbon containing a heat sublimation or a vaporizable dye is superimposed on a transfer receiving medium provided with a sublimation ink image receiving layer, and the back surface of the sublimation ink ribbon is thermally transferred. The image is formed by heating with a head to transfer the dye in the sublimable ink ribbon to the sublimable ink image receiving layer. When the transfer recording method is used to perform transfer recording on a magnetic card based on a polyethylene terephthalate film widely used for a magnetic card, particularly a polyethylene terephthalate film having a thickness of 100 to 300 μm which is generally used. Since the rigidity of the base material is higher than that of a polyvinyl chloride film used for a cash card or the like, problems of image characteristics such as poor transferability and insufficient image density and poor resolution are likely to occur. When high energy is applied from a thermal head during transfer recording to improve such a problem, the heat at the time of transfer is applied only from one direction of the base material. Deformation / warpage or fusion of the ink ribbon to the transfer target causes troubles such as poor transport and errors in reading magnetic records when a user inserts a magnetic card into an automatic ticket gate or ticket vending machine. There was a problem that occurs.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and excellent image characteristics can be obtained by using a sublimation thermal transfer recording system.
An object of the present invention is to provide a magnetic card having good transportability in an apparatus which does not cause problems such as fusion of an ink ribbon and deformation / warpage of a card even when high energy is applied.

[0004]

According to the present invention, there is provided a magnetic card comprising a polyethylene terephthalate film as a base material, a magnetic recording layer provided on one side of the base material, and a sublimable ink image receiving layer provided on the other side. A magnetic card having an intermediate layer containing an epoxy resin and polyethylene wax provided between a material and a sublimable ink image receiving layer.

The materials constituting the magnetic card of the present invention will be described below. The intermediate layer formed between the substrate and the sublimable ink image-receiving layer contains an epoxy resin and polyethylene wax. The intermediate layer has a function as a cushion and a function to disperse heat of the thermal head throughout the layer when an image is formed by heating the sublimable ink ribbon to the sublimable ink image receiving layer with a thermal head. As a result, good image characteristics without insufficient image density or poor resolution can be obtained, and an image can be formed with a low calorific value, so that a magnetic card based on a polyethylene terephthalate film may be deformed or warped. Can be prevented.

The epoxy resin used for the intermediate layer is a compound having two or more epoxy groups in a molecule, and is a glycidyl ester type resin, a glycidyl ether type resin, a glycidyl amine type resin, an alicyclic epoxy resin, a linear epoxy resin. An aliphatic epoxy resin or the like can be used. In the present invention, among the above epoxy resins, the epoxy equivalent is 4
Epoxy resins of from 00 to 5,000, particularly preferably from 400 to 2,500, are preferred because they provide good print density, are excellent in image characteristics, and are unlikely to cause deformation and warpage of the card. If the epoxy equivalent is smaller than 400, a sufficient print density may not be obtained. Conversely, if the epoxy equivalent is larger than 5,000, the cushion function is deteriorated, and image quality defects such as a decrease in print density are caused. There is a possibility that a problem that the card is easily deformed or warped may occur.

The polyethylene wax is a low molecular weight polyethylene having a molecular weight of about 1,000 to 1,000.
About 0 can be applied, and a modified type polyethylene wax having a carboxyl group, a hydroxyl group, or the like can also be used. In the present invention, it is preferable to use polyethylene wax having a melting point of 110 ° C. or less because of excellent heat dispersion during recording and the effect of preventing fusion of the thermal head. The melting point refers to a value measured by a differential thermal analysis.

The intermediate layer of the present invention is formed by appropriately blending the above-mentioned epoxy resin and polyethylene wax, and 1 to 20 parts by weight of polyethylene wax, especially 3 parts by weight, per 100 parts by weight of epoxy resin. It is preferable to add 10 to 10 parts by weight. If the added amount of polyethylene wax is small, it is insufficient to disperse the heat of the thermal head over the entire layer, and if the added amount of polyethylene wax is too large, bleed out of the wax occurs, and then the sublimation formed The adhesion to the ink image receiving layer is impaired. The intermediate layer can be formed by a conventional coating method or printing method, and has a layer thickness of 0.5 to
It is 5 μm, preferably 1-3 μm.

As the substrate, polyethylene terephthalate having a thickness of 50 μm to 1 mm is applied.
A polyethylene terephthalate film of 00 to 300 μm is practical, and a magnetic card of 188 μm or 250 μm is particularly preferably used.

The magnetic material used for the magnetic recording layer is r-
Magnetic powders such as iron oxide, cobalt-doped r-iron oxide, chromium oxide, barium ferrite, and strontium ferrite are used. These magnetic materials are vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinyl acetate / vinyl alcohol copolymer, polyurethane resin, polyester resin,
A magnetic recording layer is formed by dispersing in a binder such as an epoxy resin together with other additives such as a pigment to form a magnetic paint or ink, and then coating or printing on a substrate and drying. At this time, a magnetic field orientation treatment may be performed before the magnetic recording layer is dried.

The sublimable ink image receiving layer is formed of a resin and a release agent. As the resin, polyester resin, acrylic resin, epoxy resin, vinyl chloride resin, vinyl chloride
Examples thereof include a vinyl acetate copolymer resin. In the present invention, a polyester resin and a vinyl chloride-vinyl acetate copolymer resin are preferred from the viewpoints of recording characteristics and adhesion to an intermediate layer. Examples of the release agent include polyethylene wax, amide wax, solid waxes such as Teflon powder, phosphate-based surfactants, and silicone oil.In the present invention, the silicone oil is uniformly dispersed. preferable. The sublimable ink image-receiving layer made of the above materials can be formed by any method such as coating or printing, and has a thickness of about 1 to 10 μm.

[0012]

Next, the present invention will be described in more detail by way of examples. Example 1 A coating material for a magnetic recording layer was prepared with the following composition.・ 100 parts by weight of barium ferrite (MC127 manufactured by Toda Kogyo) ・ 3 parts by weight of carbon black (MA100 manufactured by Mitsubishi Chemical Corporation) ・ 20 parts by weight of vinyl chloride / vinyl acetate / vinyl alcohol copolymer (S-LEC A manufactured by Sekisui Chemical) 20 parts by weight of polyurethane resin (N2304 manufactured by Nippon Polyurethane Co., Ltd.) 60 parts by weight of toluene 60 parts by weight of methyl ethyl ketone 60 parts by weight of methyl isobutyl ketone The mixture having the above composition was dispersed by a ball mill for 8 hours, and then polyisocyanate resin (Japan) After adding 5 parts by weight of Coronate L (manufactured by Polyurethane Co.), a coating material for a magnetic recording layer was prepared, applied on a substrate made of a white polyethylene terephthalate film having a thickness of 188 μm by a gravure coating method, and subjected to a magnetic field orientation treatment. After drying, a magnetic recording layer was formed. The dry coating amount was 30 g / m ² .

Next, an intermediate layer paint to be provided on the opposite side of the white polyethylene terephthalate film provided with the magnetic recording layer was prepared with the following composition.・ 20 parts by weight of epoxy resin (Epicoat 1007 manufactured by Yuka Shell Co., epoxy equivalent 1950) ・ 1 part by weight of polyethylene wax (110P manufactured by Mitsui Petrochemical Industries, melting point 100 ° C.) ・ 100 parts by weight of toluene ・ 100 parts by weight of methyl ethyl ketone A coating having the composition was applied by gravure coating on the surface on the opposite side of the white polyethylene terephthalate film provided with the magnetic recording layer, and dried to form an intermediate layer. In addition,
The dry coating amount was 3 g / m ² , and the coating thickness was 3 μm.

Next, a sublimable ink image-receiving layer paint was prepared with the following composition. -20 parts by weight of vinyl chloride / vinyl acetate copolymer (Solvain CN manufactured by Nissin Chemical Industry Co., Ltd.)-1 part by weight of silicon oil (KF-393 manufactured by Shin-Etsu Chemical Co., Ltd.)-100 parts by weight of toluene-100 parts by weight of methyl ethyl ketone The composition having the following composition was printed on the intermediate layer by a screen printing method and dried to form a sublimable ink image-receiving layer. The dry coating amount was 2 g / m ² and the coating thickness was 2 μm. The magnetic recording medium formed as described above is
The magnetic card of the present invention was produced by punching out the size.

Example 2 A magnetic card of the present invention was produced in the same manner as in Example 1, except that a paint having the following composition was used as the intermediate layer paint. 20 parts by weight of epoxy resin (Epicoat 1055 manufactured by Yuka Shell Co., epoxy equivalent: 850) 1 part by weight of polyethylene wax (110P manufactured by Mitsui Petrochemical Industries, melting point 100 ° C.) 100 parts by weight of toluene 100 parts by weight of methyl ethyl ketone

Example 3 A magnetic card of the present invention was produced in the same manner as in Example 1 except that a paint having the following composition was used as the paint for the sublimable ink image-receiving layer.・ 20 parts by weight of polyester resin (Vylon 290 manufactured by Toyobo Co., Ltd.) ・ 1 part by weight of amino-modified silicone oil (KF-857 manufactured by Shin-Etsu Chemical Co., Ltd.) ・ 1 part by weight of epoxy-modified silicone oil (KF-103 manufactured by Shin-Etsu Chemical Co., Ltd.) ) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

Example 4 A magnetic card of the present invention was produced in the same manner as in Example 1 except that a paint having the following composition was used as the intermediate layer paint.・ 20 parts by weight of epoxy resin (Epicoat 1001, manufactured by Yuka Shell Co., epoxy equivalent: 470) ・ 1 part by weight of polyethylene wax (110P, manufactured by Mitsui Petrochemical Co., Ltd., melting point: 100 ° C.) ・ 100 parts by weight of toluene ・ 100 parts by weight of methyl ethyl ketone

Example 5 A magnetic card of the present invention was produced in the same manner as in Example 1 except that a paint having the following composition was used as the intermediate layer paint.・ Epoxy resin 20 parts by weight (Epicoat 1007 manufactured by Yuka Shell Co., epoxy equivalent 2000) ・ Polyethylene wax 1 part by weight (210P manufactured by Mitsui Petrochemical Industries, Ltd., melting point 120 ° C.) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

Example 6 A magnetic card of the present invention was produced in the same manner as in Example 1 except that a paint having the following composition was used as the paint for the intermediate layer.・ 20 parts by weight of epoxy resin (Epototo YD-020, manufactured by Toto Kasei Co., Ltd., epoxy equivalent: 6000) ・ 1 part by weight of polyethylene wax (110P, manufactured by Mitsui Petrochemical Industries, Ltd., melting point: 100 ° C.) ・ 100 parts by weight of toluene ・ 100 parts by weight of methyl ethyl ketone

Comparative Example 1 A comparative magnetic card was prepared in the same manner as in Example 1 except that the intermediate layer was not provided.

Comparative Example 2 A magnetic card of the present invention was produced in the same manner as in Example 1 except that a paint having the following composition was used as the intermediate layer paint. 20 parts by weight of nitrocellulose resin (Celnova BT-SL manufactured by Asahi Kasei Corporation) 1 part by weight of polyethylene wax (110P manufactured by Mitsui Petrochemical Industries, melting point 100 ° C.) 100 parts by weight of toluene 100 parts by weight of methyl ethyl ketone

Comparative Example 3 A comparative magnetic card was prepared in the same manner as in Example 1 except that a paint having the following composition was used as the intermediate layer paint.・ 20 parts by weight of vinyl chloride / vinyl acetate / vinyl alcohol copolymer resin (VAGH manufactured by Union Carbide) ・ 1 part by weight of polyethylene wax (110P manufactured by Mitsui Petrochemical Industries, melting point 100 ° C.) ・ 100 parts by weight of toluene ・ methyl ethyl ketone 100 parts by weight

Comparative Example 4 A comparative magnetic card was prepared in the same manner as in Example 1 except that a paint having the following composition was used as the paint for the intermediate layer.・ 20 parts by weight of epoxy resin (Epicoat 1007 manufactured by Yuka Shell Co., epoxy equivalent 1950) ・ 100 parts by weight of toluene ・ 100 parts by weight of methyl ethyl ketone

Images were formed on the sublimable ink receiving layer surfaces of the magnetic cards prepared in Examples 1 to 6 and Comparative Examples 1 to 4 by heating a sublimable transfer ink ribbon with a thermal head. The results are as shown in Table 1. All the magnetic cards provided with the specific intermediate layer of the present invention exhibited good image characteristics, and no warpage or deformation of the magnetic card occurred. On the other hand, the magnetic card of the comparative example is not provided with the intermediate layer, or even if it is provided, the epoxy resin and the polyethylene wax are not used in combination.
All of them have poor image characteristics and have a problem that the magnetic card is warped or deformed.

[0025]

[Table 1]

The evaluation method of each characteristic in Table 1 is as follows. (1) Image density: The density obtained by measuring the solid black portion of the formed image with a Macbeth densitometer RD-914 visual filter. (2) Resolution: The formation state of 1 dot of the image was observed with an optical microscope.・ ・ ・: Very good ○: Good △: Slightly poor resolution ×: Poor and practically problematic. (3) Warpage of the magnetic card: The magnetic card after image formation is placed on a flat surface so that the warp is directed upward, and the height from the flat surface, that is, the height of the corner of the card having the largest warpage from the flat surface is measured. It was warped. (4) Conveyability: 100 magnetic cards after image formation were subjected to read / write by a commercially available magnetic reader / writer, and the number of sheets having defective conveyance was examined.

[0027]

The magnetic card of the present invention comprises a polyethylene terephthalate film as a base material, a magnetic recording layer on one side,
Sublimation ink image receiving layer has a structure in which the sublimation ink image receiving layer is sequentially laminated on the intermediate layer containing epoxy resin and polyethylene wax on the opposite surface, so that the transfer image from the sublimation ink ribbon can be efficiently received, and the transfer image density is high. It has excellent image characteristics with good resolution, and does not cause deformation and warpage of the magnetic card after transfer recording, so it has a remarkable effect that it has excellent practical characteristics such as transportability in the device. is there.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI B42D 15/10 551 B42D 15/10 551A G06K 19/06 G11B 5/80 G11B 5/80 G06K 19/00 B (58) Field (Int.Cl. ⁷ , DB name) B41M 5/38 B42D 15/10 501

Claims (4)

(57) [Claims] 1. A magnetic card comprising a polyethylene terephthalate film as a base material and a magnetic recording layer provided on one surface of the base material and a sublimable ink image-receiving layer provided on the other surface. A magnetic card having an intermediate layer containing an epoxy resin and a polyethylene wax between them. 2. The magnetic card according to claim 1, wherein 1 to 20 parts by weight of polyethylene wax is added to 100 parts by weight of the epoxy resin in the intermediate layer. 3. An epoxy resin having an epoxy equivalent of 400 to 400.
2. The magnetic card according to claim 1, wherein the number is 5000. 4. The melting point of polyethylene wax is 110 ° C.
2. The magnetic card according to claim 1, wherein: