JP2002222516A - Magnetic recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording medium wherein excellent image characteristics can be obtained using a sublimatable thermosensitive transfer method and satisfactory sublimation transfer recording can be applied to the part where a printing pattern is formed without generating the fusion, deformation, cupping and the like of an ink ribbon. SOLUTION: In the magnetic recording medium, a magnetic recording layer and an anchor layer are provided on one surface and the other surface of a base material, respectively. A sublimatable ink image receiving layer containing a copolymer having at least vinyl chloride and vinyl acetate as monomer components and alkyl-modified silicone oil is laminated via a printing pattern formed by using UV curing ink on the anchor layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic recording medium used for various cards such as a prepaid card, an ID card, a cash card, and a point card.

[0002]

2. Description of the Related Art In recent years, magnetic recording media using a magnetic recording method have been widely used for cards such as prepaid cards, ID cards, and point cards. In these cards, for example, in order to make the recorded contents visible, such as the display of the balance of a prepaid card, those in which a sublimable ink image receiving layer is formed on the surface in combination with a sublimation thermal transfer recording method are used. ing. In the 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 an image is formed from the back side of the sublimation ink ribbon. Heating with a thermal head, the dye in the sublimable ink ribbon is transferred to the sublimable ink image receiving layer to form an image.Since a good image can be obtained easily, it is used for various recordings. ing.

On the other hand, in a magnetic recording medium used for various cards, a polyethylene terephthalate film has recently been used as a base material instead of a polyvinyl chloride film from the viewpoint of environmental problems. When the transfer recording is performed on the magnetic recording medium by the transfer method,
Such a film has a higher rigidity than the polyvinyl chloride film, so that the transferability is poor and there is a problem that image characteristics such as insufficient image density and poor resolution are inferior.

When recording is performed by applying high energy from a thermal head during recording in order to improve the above transferability, the heat during the transfer causes the ink ribbon to fuse to the ink receiving layer of the magnetic recording medium. As a result, a good image cannot be obtained, and there is still a problem in recording characteristics, and there is a problem in that transportability in a recording apparatus is impaired. In addition, when the magnetic recording medium is deformed due to local heat of the transfer recording portion and the user inserts the magnetic recording medium into an automatic ticket gate or a ticket vending machine, a conveyance failure, a magnetic recording reading error, or the like occurs. There was a problem that the trouble of generating.

In order to solve the above-mentioned problem of fusion, a release agent such as silicon or wax is added to the sublimable ink image-receiving layer. However, a magnetic card such as a prepaid card usually has a sublimable ink image-receiving layer. Offset printing using UV-curable ink on the side to form a layer
A print pattern such as a character is provided. If such a print pattern contains a release agent such as silicon or wax in the sublimable ink image receiving layer, the adhesiveness of the printing ink is poor, so that peeling of the print pattern or poor printing occurs.
There is a problem in forming a print pattern on the sublimable ink image receiving layer.

Therefore, it is necessary to form a print pattern on a substrate before providing a sublimable ink image receiving layer. In this case, the adhesion between the sublimable ink image receiving layer and the sublimable ink ribbon at the time of heating the thermal head is stronger than the adhesion between the printing pattern formed of the ultraviolet curable ink and the substrate or the sublimable ink image receiving layer. For this reason, when heated by the thermal head during printing, the printed pattern portion is peeled off, making it impossible to perform printing well, and as a result, it is difficult to secure a sufficient printable area. There was a problem that would.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is possible to obtain excellent image characteristics by using a sublimation thermal transfer system and to apply high energy by applying high energy. Also, there is no problem such as deformation of the ink ribbon, deformation or warping that affects writing and reading of magnetic information, and good sublimation transfer recording is also performed on the part where the print pattern is formed. A possible magnetic recording medium is provided.

[0008]

According to the present invention, a magnetic recording layer is provided on one surface of a base material and an anchor layer is provided on the other surface, and an ultraviolet curable ink formed on the anchor layer is used. A magnetic recording medium characterized in that a sublimable ink image-receiving layer containing an alkyl-modified silicone oil and a copolymer containing at least vinyl chloride and vinyl acetate as monomer components are laminated via a printing pattern.

In the magnetic recording medium of the present invention, the content of the alkyl-modified silicone oil in the sublimable ink receiving layer is 0.1 to 100 parts by weight of a copolymer containing vinyl chloride and vinyl acetate as at least a monomer component. ~
It is preferably 10.0 parts by weight, and it is preferable to use an alkyl aralkyl-modified silicone oil as the alkyl-modified silicone oil. The glass transition temperature of the copolymer containing vinyl chloride and vinyl acetate at least as monomer components is preferably 60 to 80 ° C. Further, the anchor layer preferably contains a polyester resin or an epoxy resin as a main component. The polyester resin has a glass transition temperature of 60 to 80 ° C., and the epoxy resin has an epoxy equivalent of 400. Those of 5000 g / eq are more preferred.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The layers constituting the magnetic recording medium of the present invention and their materials will be described below. Base material is thickness 50
Various types of sheet materials such as various resin films and paper having a thickness of 1 μm to 1 mm are appropriately used. Among them, polyethylene terephthalate films are preferably used. In the present invention, polyethylene terephthalate films having a thickness of 100 to 300 μm are practically preferable. , Especially 1 for magnetic card
Those having a size of 88 μm or 250 μm are preferably used.

As the magnetic material used for the magnetic recording layer, various magnetic powders having a coercive force of 300 to 5000 Oe can be used. Specifically, γ-iron oxide, cobalt-doped γ-iron oxide, Chrome, barium ferrite,
Magnetic powder such as strontium ferrite is applied. Such a magnetic substance, a vinyl chloride-vinyl acetate copolymer, a vinyl chloride-vinyl acetate-vinyl alcohol copolymer, a polyurethane resin, a polyester resin, an epoxy resin and other binders, pigments used as necessary, The magnetic recording layer is formed by dispersing together with an additive such as a dispersant to prepare a magnetic paint or ink, and applying or printing this on a substrate or drying. At this time, a magnetic field orientation treatment may be performed before the magnetic recording layer is dried. Further, a silver color hiding layer or a white color hiding layer may be provided on the magnetic recording layer as needed.

[0012] The anchor layer improves the transferability of an image from the sublimable ink ribbon to the sublimable ink image-receiving layer during printing by heating with a thermal head, and provides a print pattern or a sublimable ink image-receiving layer provided on the anchor layer. It is provided in order to improve the adhesiveness to the film and prevent peeling. In the present invention, the anchor layer, the base material, the printing pattern and the adhesiveness with the sublimation ink image receiving layer, in consideration of the adhesiveness, various resins can be appropriately used, among which polyester resin or epoxy resin is used as a main component Is preferred because the above-described image transferability and adhesion are particularly excellent.

The polyester resin used for the anchor layer in the present invention comprises terephthalic acid,
Isophthalic acid, phthalic acid, methyl terephthalic acid, trimellitic acid, pyromellitic acid, adipic acid, sebacic acid, succinic acid, maleic acid, fumaric acid, tetrahydrophthalic acid,
Methyl-tetrahydrophthalic acid, hexahydrophthalic acid, and anhydrides thereof are used. The alcohol component includes ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, bishydroxyethyl phthalate, hydrogenated bisphenol A, hydrogenated Bisphenol A ethylene oxide adduct or propylene oxide adduct, trimethylolethane, trimethylolpropane, glycerin, pentaerythritol and the like can be used.
In the present invention, among the polyester resins obtained by appropriately combining the acid component and the alcohol component as described above, a polyester resin having a glass transition temperature of 60 to 80 ° C. is excellent in image formation in which a particularly good print density is obtained. It is preferable because of good adhesion to a polyethylene terephthalate film. If the glass transition temperature of the polyester resin is lower than the above range, peeling of the sublimable ink image-receiving layer and fusion of the ink ribbon are liable to occur.On the other hand, if the glass transition temperature is high, the transferability becomes poor or the card is deformed. In any case, good transfer recording characteristics may be impaired. In addition, the glass transition temperature in the present invention is measured by a differential thermal analysis method, and refers to a shoulder value in an absorption curve thereof.

The epoxy resin used for the anchor layer is a polymer compound having two or more epoxy groups in a molecule, such as a glycidyl ester resin, a glycidyl ether resin, a glycidylamine resin, and an alicyclic epoxy resin. And a linear aliphatic epoxy resin.
In the present invention, among the above epoxy resins, the epoxy equivalent thereof is 400 to 5000 g / eq, particularly 400 to 5000 g / eq.
An epoxy resin of 2500 g / eq is preferred because a good print density is obtained and recording properties are excellent, and adhesion to a polyethylene terephthalate film is good. If the epoxy equivalent is less than 400, sticking may occur during printing.
When it is larger than 000, the transferability may be deteriorated and a good image may not be obtained, and in any case, good transfer recording characteristics may be impaired.

The anchor layer in the present invention may contain a wax such as polyethylene wax, paraffin wax, carnauba wax, montan wax or petroleum resin wax, if necessary, in order to obtain better transfer recording characteristics. Among these waxes, polyethylene wax is particularly preferable. To form the anchor layer,
A coating solution in which the above materials are dissolved or dispersed in a solvent can be formed by a conventional coating method or printing method, and the layer thickness is 0.5 to 5 μm, preferably 1 to 3 μm.
μm.

The printing pattern formed on the anchor layer is formed by using an ultraviolet curable ink, so that the above-mentioned effect of improving the image transferability is not lost, and the printing pattern formed on the anchor layer and the sublimable ink image receiving layer is not lost. The effect of having good adhesiveness, having excellent heat resistance, and preventing the occurrence of deformation and warpage is achieved. The UV-curable ink used in the present invention is, for example, a monomer capable of performing radical polymerization of a monomer containing a vinyl group, an oligomer, etc., specifically, an oligoacrylate, a urethane acrylate,
Many types such as silicon acrylate can be used as appropriate, and are not particularly limited, and those containing a photopolymerization initiator such as benzoyl alkyl ether, benzophenone, and benzyl Michler's ketone for curing by ultraviolet irradiation. In addition, it is possible to appropriately use various ultraviolet curable inks colored in an arbitrary color with a pigment, a dye, or the like.

The print pattern according to the present invention is a pattern composed of characters, designs, patterns, combinations thereof, and the like, and is formed on a part or the entire surface of the anchor layer. The printing pattern is offset printing,
It can be formed by a conventional printing method such as screen printing, and has a layer thickness of 0.1 to 3 μm, preferably 0.5 to 3 μm.
２2 μm.

The sublimable ink image-receiving layer contains a copolymer containing at least vinyl chloride and vinyl acetate as monomer components and an alkyl-modified silicone oil.
The copolymer used in the present invention has excellent transferability and fixability because of its good affinity for sublimable dyes. Further, the alkyl-modified silicone oil has an effect of preventing fusion of the ink ribbon, hardly causing deformation and warpage, and obtaining excellent adhesion to the lower layer.

The copolymer used in the sublimable ink image-receiving layer of the present invention is not particularly limited as long as it is a copolymer using at least vinyl chloride and vinyl acetate as its monomer components. A copolymer containing at least 80 mol% of the two monomer components is preferred, and a copolymer composed of only two components, vinyl chloride and vinyl acetate, is particularly preferred. However, the ratio is preferably 70:30 to 98: 2, particularly preferably 85:15 to 95: 5. In this case, as a monomer component applicable other than the two monomer components, there are vinyl alcohol, maleic acid, and derivatives thereof. In the present invention, among the copolymers, the glass transition temperature is 60 to 80 ° C.
Is preferred because a particularly good print density is obtained and the image characteristics are excellent.

The alkyl-modified silicone oil used in the present invention is one in which at least a part of the methyl group of polymethylsiloxane is substituted with an alkyl group having 2 to 18 carbon atoms. In the present invention, among them, alkyl aralkyl-modified silicone oil is particularly preferable. Such an alkyl aralkyl-modified silicone oil is aralkyl-modified in addition to the above-mentioned alkyl-modified, and comprises a mixture of an alkyl-modified siloxane molecule and an aralkyl-modified siloxane molecule, and an alkyl aralkyl-modified siloxane molecule. Or a mixture of these molecules as appropriate. The aralkyl group is preferably an aralkyl group having 7 to 10 carbon atoms, such as a benzyl group and a phenethyl group.

The sublimable ink image-receiving layer contains the copolymer and an alkyl-modified silicone oil.
Other resins, release agents, pigments and the like may be used in combination to such an extent that the effects of the present invention are not impaired. Examples of the resin that can be used in combination include a vinyl chloride resin, an acrylic resin, a styrene resin, and an epoxy resin. Examples of the release agent include silicone oil, polyethylene wax, amide wax, solid waxes such as Teflon (registered trademark) powder, and phosphate ester surfactants.

The sublimable ink image-receiving layer of the present invention has the above composition, and the content of the alkyl-modified silicone oil is appropriately determined according to the material composition. It is preferable that 0.1 to 10 parts by weight, particularly 0.5 to 5 parts by weight, of the alkyl-modified silicone oil is added to 100 parts by weight of the combined product. When the addition amount of the alkyl-modified silicone oil is small, fusion with the sublimable ink ribbon easily occurs during printing by heating with a thermal head, and when the addition amount of the alkyl-modified silicone oil is too large Since the adhesiveness with the print pattern formed by the ultraviolet curable ink provided under the sublimable ink image receiving layer is reduced, the sublimable ink image formed on the print pattern during the sublimation thermal transfer recording is used. There is a possibility that the layer portion may be peeled off or may be fused to the thermal head.

The sublimable ink image receiving layer can be formed by a conventional coating method or printing method using a coating solution in which a material having the above composition is dissolved or dispersed in a solvent. The layer thickness is about 1 to 10 μm.

[0024]

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 (trade name: MC127, manufactured by Toda Kogyo KK) ・ 3 parts by weight of carbon black (trade name: MA100, manufactured by Mitsubishi Chemical Corporation) ・ 20 parts by weight of vinyl chloride / vinyl acetate / vinyl alcohol copolymer ( Sekisui Chemical Co., Ltd., trade name: Eslek A) 20 parts by weight of polyurethane resin (manufactured by Nippon Polyurethane Co., Ltd., trade name: N2304) 60 parts by weight of toluene 60 parts by weight of methyl ethyl ketone 60 parts by weight of methyl isobutyl ketone From the above composition The resulting mixture was dispersed in a ball mill for 8 hours, and then 5 parts by weight of a polyisocyanate resin (manufactured by Nippon Polyurethane Co., Ltd., trade name: Coronate L) was added to prepare a coating for a magnetic recording layer. A white polyethylene terephthalate film having a thickness of 188 μm Gravure coating method on a substrate consisting of After the treatment, it was dried to form a magnetic recording layer. The dry coating amount was 30 g / m ² .

Next, on the opposite side of the white polyethylene terephthalate film provided with the magnetic recording layer, a coating for an anchor layer having the following composition was applied by a gravure coating method and dried to form an anchor layer having a thickness of 2 μm. . Note that the coating amount was 2 g / m ² .・ Polyester resin 20 parts by weight (Toyobo Co., Ltd., trade name: Byron 200, glass transition temperature 67 ° C.) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

Next, a pattern pattern is printed on the anchor layer by using an ultraviolet curable ink having the following composition by an offset printing method, and cured by irradiating ultraviolet rays to form a print pattern having a thickness of 1 μm. did.・ 100 parts by weight of Best Cure BF Yellow (trade name, manufactured by T & K TOKA) ・ 5 parts by weight of BF Medium (trade name, manufactured by T & K TOKA)

Further, a paint for a sublimable ink image-receiving layer having the following composition is prepared, and is printed and dried by a screen printing method on the anchor layer on which the above-mentioned print pattern is formed, and has a thickness of 3 μm (dry coating amount). Formed a sublimable ink image receiving layer of 3 g / m ² ) to obtain a magnetic recording medium of the present invention.・ 20 parts by weight of vinyl chloride / vinyl acetate copolymer (trade name: Solvain CN, glass transition temperature 75 ° C., manufactured by Nissin Chemical Co., Ltd.) ・ 1 part by weight of alkyl aralkyl-modified silicone oil (trade name, manufactured by Toshiba Silicone Co., Ltd.) TSF4420) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

(Example 2) A magnetic recording medium of the present invention was produced in the same manner as in Example 1, except that the coating composition for the anchor layer used in Example 1 was as follows.・ 20 parts by weight of polyester resin (manufactured by Toyobo Co., Ltd., trade name: Byron 290, glass transition temperature 72 ° C.) ・ 100 parts by weight of toluene ・ 100 parts by weight of methyl ethyl ketone

(Example 3) A magnetic recording medium of the present invention was produced in the same manner as in Example 1 except that the following composition was used as the coating material for the anchor layer.・ 20 parts by weight of epoxy resin (product name: Epicoat 1007, epoxy equivalent: 1950, manufactured by Yuka Shell Epoxy) ・ 100 parts by weight of toluene ・ 100 parts by weight of methyl ethyl ketone

Example 4 A magnetic recording medium of the present invention was produced in the same manner as in Example 1, except that the following composition was used as the coating material for the sublimable ink image receiving layer.・ 20 parts by weight of vinyl chloride / vinyl acetate copolymer (manufactured by Nissin Chemical Industry Co., Ltd., trade name: Solvain C, glass transition temperature: 70 ° C.) ・ 1 part by weight of alkylaralkyl-modified silicone oil (trade name, manufactured by Toshiba Silicone Co., Ltd.) : TSF4420) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

Example 5 A magnetic recording medium of the present invention was produced in the same manner as in Example 1 except that the following composition was used as the coating material for the sublimable ink image-receiving layer.・ 20 parts by weight of vinyl chloride / vinyl acetate copolymer (manufactured by Nissin Chemical Co., Ltd., trade name: Solvain C40, glass transition temperature: 53 ° C.) ・ 1 part by weight of alkylaralkyl-modified silicone oil (trade name, manufactured by Toshiba Silicone Co., Ltd.) : TSF4420) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

Example 6 A magnetic recording medium of the present invention was produced in the same manner as in Example 1 except that the following composition was used as the coating material for the sublimable ink image-receiving layer.・ 20 parts by weight of vinyl chloride / vinyl acetate / vinyl alcohol copolymer (manufactured by Nissin Chemical Co., Ltd., trade name: Solvain A, glass transition temperature: 76 ° C.) ・ 1 part by weight of alkyl aralkyl-modified silicone oil (manufactured by Toshiba Silicone Co., Ltd.) , Trade name: TSF4420)-toluene 100 parts by weight-methyl ethyl ketone 100 parts by weight

Example 7 A magnetic recording medium of the present invention was prepared in the same manner as in Example 1 except that the following composition was used as the sublimable ink image-receiving layer coating composition.・ 20 parts by weight of vinyl chloride / vinyl acetate copolymer (manufactured by Nissin Chemical Industry Co., Ltd., trade name: Solvain CN, glass transition temperature: 75 ° C.) ・ 3 parts by weight of alkylaralkyl-modified silicone oil (manufactured by Toshiba Silicone Co., trade name: TSF4420) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

Example 8 A magnetic recording medium of the present invention was produced in the same manner as in Example 1 except that the coating composition for the anchor layer used in Example 1 was as follows. -Epoxy resin 20 parts by weight (Toto Kasei Co., Ltd., trade name: Epototo YD-020, epoxy equivalent 6000)-Toluene 100 parts by weight-Methyl ethyl ketone 100 parts by weight

Example 9 A magnetic recording medium of the present invention was produced in the same manner as in Example 1, except that the coating composition for the anchor layer used in Example 1 was as follows.・ Polyester resin 20 parts by weight (Toyobo Co., Ltd., trade name: Byron GK130, glass transition temperature 15 ° C.) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

Comparative Example 1 A magnetic recording medium of Comparative Example 1 was produced in the same manner as in Example 1 except that no anchor layer was provided.

Comparative Example 2 A magnetic recording medium of Comparative Example 2 was prepared in the same manner as in Example 1, except that the following composition was used as the coating material for the sublimable ink image receiving layer.・ 20 parts by weight of polyester resin (manufactured by Toyobo Co., Ltd., trade name: Byron 200, glass transition temperature: 67 ° C.) ・ 1 part by weight of alkyl aralkyl modified silicone oil (trade name: TSF4420, manufactured by Toshiba Silicone Co., Ltd.)・ 100 parts by weight of methyl ethyl ketone

Comparative Example 3 A magnetic recording medium of Comparative Example 3 was produced in the same manner as in Example 1 except that the following composition was used as the coating material for the sublimable ink image receiving layer.・ Acrylic resin 20 parts by weight (Mitsubishi Rayon Co., Ltd., trade name: BR-60, glass transition temperature 75 ° C.) ・ Alkyl aralkyl modified silicone oil 1 part by weight (Toshiba Silicone Co., Ltd., trade name: TSF4420) ・ Toluene 200 wt. Department

Comparative Example 4 A magnetic recording medium of Comparative Example 4 was produced in the same manner as in Example 1 except that the following composition was used as the coating material for the sublimable ink image-receiving layer.・ 20 parts by weight of vinyl chloride / vinyl acetate copolymer (manufactured by Nissin Chemical Industry Co., Ltd., trade name: Solvain CN, glass transition temperature 75 ° C.) ・ 100 parts by weight of toluene ・ 100 parts by weight of methyl ethyl ketone

Comparative Example 5 A magnetic recording medium of Comparative Example 5 was produced in the same manner as in Example 1 except that the following composition was used as the coating material for the sublimable ink image-receiving layer.・ 20 parts by weight of vinyl chloride / vinyl acetate copolymer (manufactured by Nissin Chemical Co., Ltd., trade name: Solvain CN, glass transition temperature: 75 ° C.) ・ 1 part by weight of epoxy-modified silicone oil (made by Shin-Etsu Chemical Co., Ltd., trade name) : KP-393) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

Comparative Example 6 A magnetic recording medium of Comparative Example 6 was produced in the same manner as in Example 1 except that the following composition was used as the coating material for the sublimable ink image-receiving layer.・ 20 parts by weight of vinyl chloride / vinyl acetate copolymer (manufactured by Nissin Chemical Co., Ltd., trade name: Solvain CN, glass transition temperature: 75 ° C.) ・ 1 part by weight of polyether-modified silicone oil (manufactured by Toshiba Silicone Co., trade name: TSF4446) ・ Toluene 100 parts by weight ・ Methyl ethyl ketone 100 parts by weight

Comparative Example 7 A magnetic recording medium of Comparative Example 7 was produced in the same manner as in Example 1, except that the following composition was used as the coating material for the sublimable ink image receiving layer. 20 parts by weight of a vinyl chloride / vinyl acetate copolymer (manufactured by Nissin Chemical Co., Ltd., trade name: Solvain CN, glass transition temperature: 75 ° C.) 1 part by weight of polyethylene wax (manufactured by Mitsui Chemicals, trade name: 110P) 100 parts by weight of toluene 100 parts by weight of methyl ethyl ketone

Comparative Example 8 A mixture having the following composition was dispersed in a ball mill for 1 hour as a print pattern in Example 1, and then 5 parts by weight of a polyisocyanate resin (trade name: Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) was added. A magnetic recording medium of Comparative Example 8 was produced in the same manner as in Example 1 except that a printing pattern having a thickness of 1 μm was formed by printing and drying using a screen printing method using a printing ink that was not an ultraviolet curing type. . 20 parts by weight of yellow colorant (trade name: SP Yellow RS, manufactured by Mikuni Pigment Co., Ltd.) 80 parts by weight of vinyl chloride / vinyl acetate copolymer (trade name: Solvain CN, manufactured by Nissin Chemical Industry Co., Ltd.) 100 parts by weight of toluene Parts: 100 parts by weight of methyl ethyl ketone

(Comparative Example 9) In Example 1, a mixture having the following composition was printed as a print pattern by a ball mill using a non-ultraviolet curable printing ink dispersed for one hour by a screen printing method and dried to obtain a thickness. 1μ
A magnetic recording medium of Comparative Example 9 was produced in the same manner as in Example 1, except that a print pattern of m was formed.・ 20 parts by weight of yellow colorant (manufactured by Mikuni Dye Co., trade name: SP Yellow RS) ・ 80 parts by weight of polyester resin (manufactured by Toyobo Co., Ltd., trade name: Byron 200) ・ 100 parts by weight of toluene ・ 100 parts by weight of methyl ethyl ketone

The magnetic recording media produced in Examples 1 to 9 and Comparative Examples 1 to 9 were punched out in JIS size to produce magnetic cards, and printed using a commercially available sublimation thermal transfer recording type printer. Was performed to evaluate printing conditions and image forming characteristics. The results are as shown in Table 1.

[0046]

[Table 1]

The evaluation method of each characteristic in Table 1 is as follows. (1) Resolution: The formation state of the image 1 dot was observed with an optical microscope for each of the printed portion and the non-printed portion of the pattern, and evaluated according to the following evaluation criteria. ◎: Very good ○: Good △: Slightly poor resolution ×: Poor (Practical problem)

(2) Printing condition: Observation of the occurrence of peeling of the sublimable ink image receiving layer or the like on the recording medium or the occurrence of fusion of the sublimable ink ribbon during printing with a printer.
The following evaluation criteria evaluated. ；: No problem at all ○: Slight peeling of anchor layer, print pattern or sublimable ink image receiving layer was observed △: Clear peeling of anchor layer, print pattern or sublimable ink image receiving layer was observed × Those in which the sublimable ink image-receiving layer and the ink ribbon are fused during printing. (3) Transportability: When 100 magnetic cards after image formation are read by a commercially available reader / writer, transport failures occur. The number of sheets generated was checked.

As is evident from the results in Table 1, the magnetic recording medium of the present invention can provide printing with excellent resolution, does not cause peeling or fusing, and has good transportability without deformation of the card. there were. On the other hand, the magnetic recording medium of the comparative example has inferior resolution, in particular, inferior resolution in printing of a printing pattern portion, and peels off in a pattern pattern printing portion during heating printing by a thermal head. And the fusion of the sublimable ink image-receiving layer and the sublimable ink ribbon occurred, making it difficult to form a good image. Further, since the printing is not performed well, the magnetic card is warped or deformed, which causes a problem in reading / writing with a reader / writer, which has a problem.

[0050]

As described above, the magnetic recording medium of the present invention has a polyethylene terephthalate film as a base material, a magnetic recording layer on one side of the base material, and a polyester resin or epoxy resin on the other side. And a sublimable ink image-receiving layer containing a vinyl chloride / vinyl acetate copolymer and an alkyl-modified silicone oil, and a UV-curable ink between the anchor layer and the sublimable ink-image receiving layer. Since the printed pattern is formed, the transferred image from the sublimable ink ribbon can be efficiently received even if the printed pattern is formed, so that transfer printing can be performed over the entire surface, and the transferred image density is high and the resolution is high. Has excellent image characteristics and does not cause warpage or deformation of the magnetic card after transfer recording, so that it can be transported by the device. In which remarkable effects, also excellent practical properties are exhibited.

Claims (7)

[Claims] 1. A magnetic recording layer is provided on one surface of a base material, and an anchor layer is provided on the other surface, and vinyl chloride is formed on the anchor layer by a printing pattern of an ultraviolet curable ink formed on the anchor layer. And a sublimable ink image-receiving layer containing an alkyl-modified silicone oil and a copolymer containing at least vinyl acetate as a monomer component. 2. The composition according to claim 1, wherein the content of the alkyl-modified silicone oil is 0.1 to 10.0 parts by weight based on 100 parts by weight of the vinyl chloride / vinyl acetate copolymer. Magnetic recording medium. 3. The alkyl-modified silicone oil according to claim 1,
3. The magnetic recording medium according to claim 1, wherein the magnetic recording medium is an alkylaralkyl modified silicone oil. 4. The glass transition temperature of the copolymer containing vinyl chloride and vinyl acetate as at least a monomer component is 6
The magnetic recording medium according to any one of claims 1 to 3, wherein the temperature is 0 to 80C. 5. The magnetic recording medium according to claim 1, wherein the anchor layer contains a polyester resin or an epoxy resin as a main component. 6. The magnetic recording medium according to claim 5, wherein the polyester resin has a glass transition temperature of 60 to 80 ° C. 7. An epoxy resin having an epoxy equivalent of 4
6. The amount is from 00 to 5000 g / eq.
A magnetic recording medium according to claim 1.