JP3046557U - Thermal recording media using transfer film - Google Patents

Abstract

(57) [Problem] To provide a thermosensitive recording medium capable of repeating recording and erasing of an image by temperature change using a transfer film capable of forming a thermoreversible recording layer even on a thick card. SOLUTION: A transfer film A in which a release layer 2, a heat-resistant layer 3, a thermoreversible recording layer 4, a metal deposition layer 5, and an adhesive layer 6 are sequentially provided on a base film 1 is transferred to a card material. Thermal recording medium.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a thermosensitive recording medium using a transfer film, in which recording and erasing of an image are repeated by a change in temperature.

[0002]

[Prior art]

 Recently, prepaid cards such as telephone cards and orange cards have been widely used. The visual information of these cards is based on the information of holes in the card, the thermosensitive layer using a loco dye or the thermosensitive layer deposited with Sn on the magnetic recording layer printed with a thermal head to display image information. Although they have been put to practical use, these visual information display methods are regrettable that the information that can be recorded is limited because they can be displayed but cannot be erased.

[0003] In order to solve these problems, a thermoreversible thermosensitive recording material that temporarily records image information and is capable of erasing the image information when it is no longer needed has attracted attention, and has been put to practical use as a thermosensitive recording medium. Have been. Further, this thermoreversible thermosensitive recording material is used not only in the field of cards but also in various fields.

FIG. 3 shows an example of the layer structure of such a conventional thermosensitive recording medium, in which a light-transmissive base material 10 is formed with a reflective layer 11 on which metal is deposited, and a thermoreversible thermosensitive recording medium is formed thereon. A layer 12 is provided. A white concealing layer 13 is provided on a non-printing area above the thermoreversible thermosensitive recording layer 12, and a printing layer 14 is provided on the white concealing layer 13. Further, an exposed portion (printing area) of the thermoreversible thermosensitive recording layer 12 and printing are provided. On the layer 14, a protective layer 15 is formed.

[0005]

[Problems to be solved by the invention]

 In the prior art described above, there is a drawback that the white concealing layer 13 of the non-printing portion must be provided in the case of a medium in which the non-printing area of the thermoreversible thermosensitive recording layer 12 occupies a large area. Further, in the case of a thick card such as an IC card or a credit card, in which a recording layer is difficult to form by coating, there is a problem that it is difficult to form each of the above layers.

The present invention has been made in order to solve such problems of the conventional technology, and is intended to transfer the image to a necessary printing area and to apply a heat-sensitive recording layer to a thick card such as an IC card or a credit card. It is another object of the present invention to provide a heat-sensitive recording medium that is intended to add a heat-sensitive recording medium and enables the transferred heat-sensitive layer to repeat recording and erasing of an image by temperature change.

[0007]

[Means for Solving the Problems]

 Therefore, in the present invention, a release layer is provided on a base film, a heat-resistant layer, a thermoreversible recording layer, and a metal deposition layer are sequentially laminated on the release layer, and an adhesive layer is further provided on the metal deposition layer. The transfer film is transferred to a material such as a card by a thermocompression bonding plate, and a thermoreversible thermosensitive recording layer capable of repeating recording and erasing is provided on the material.

[0008]

[Embodiment of the invention]

 In the present invention, a release layer, a heat-resistant layer, a thermoreversible recording layer, a metal-deposited layer, and an adhesive layer are provided on a base film, and a heat-resistant layer, a thermoreversible recording layer, and a metal-deposited layer are formed on a material by a metal thermocompression bonding plate. Then, a thermoreversible thermosensitive recording layer was added to a prepaid card, a thick card, an IC card, a label, a name plate, etc., so that recording and erasing of an image could be repeatedly printed by a change in temperature.

[0009]

【Example】

 FIG. 1 shows a cross section of a transfer film A used in the present invention. Reference numeral 1 denotes a base film made of polyester, polypropylene, polycaponate, etc., on which a release layer 2, a heat-resistant layer 3, and a thermoreversible recording medium. It is constituted by sequentially providing a layer 4, a metal deposition layer 5, and further an adhesive layer 6.

The release layer 2 contains, for example, an acrylic resin, a silicon resin, an acrylic / vinyl resin, or an alkyd resin as a main component, and has a thickness of 0.5 to 3 μm.

The heat-resistant layer 3 is made of a thermosetting resin, a photocurable resin, for example, a polymethacrylate resin, a silicone resin, an acrylic resin, an alkyd resin, or a urethane / acrylate resin by a bar coating, gravure coating, or roll coating method. It is formed by coating, drying and curing to a thickness of 1 to 5 μm.

The thermoreversible recording layer 4 is composed of a liquid obtained by dissolving or dispersing an organic high-molecular substance and an organic low-molecular substance with an appropriate solvent. Examples of the organic high-molecular substance include polyester resin, polyvinyl chloride, vinyl chloride. Vinyl acetate copolymer, vinyl chloride / vinyl acetate / maleic acid copolymer, vinyl chloride / vinyl acetate / vinyl alcohol copolymer, vinyl chloride / acrylate copolymer, polyvinylidene chloride / acrylonitrile copolymer, polyamide Resins, acrylic resins and silicone resins.

[0013] Examples of the organic low-molecular substance include alkanols, alkdiols, halogen alkanols, alkanols, alkylamines, alkanes, alkynes, halogen alkanes, halogen alkenes, halogen alkynes, cycloalkanes, cycloalkenes, cycloalkynes, and saturated alkanols. Or unsaturated halogen fatty acids and their esters, amides or ammonium salts, halogenoallyl carboxylic acids and their esters, carboxylic acid esters of thioalcohol, etc., having 10 to 40 carbon atoms and a molecular weight of 100 to 700. Is raised. The mixing ratio between the organic high-molecular substance and the organic low-molecular substance is in the range of 20: 1 to 1: 2.

The thermoreversible recording layer 4 is formed by applying a bar coat, a gravure coat, and a roll coat so as to have a thickness of 10 to 30 μm. Further, between the heat-resistant layer 3 and the thermoreversible recording layer 4, the transfer of the organic low-molecular substance in the thermoreversible recording layer to another layer is prevented, and the heat-resistant layer 3 is bonded to the thermoreversible recording layer 4. A layer may be provided to enhance the properties.

The metal deposition layer 5 is, for example, a white metal such as aluminum, tin, and oxides thereof, formed by a vacuum deposition method, a sputtering method, or an ion plating method, and has a thickness of 0.03 to 0.3 mm. 10 μm. Further, a layer may be provided between the thermoreversible recording layer 4 and the metal vapor-deposited layer 5 to increase the adhesiveness between the heat-resistant layer 3 and the thermoreversible recording layer 4 or to enhance the mirror surface of the metal vapor-deposited layer 5. .

The adhesive layer 6 is formed of a material mainly composed of an acrylic resin or a vinyl resin by a bar coating or gravure coating method. Its thickness is 0.5 to 3 μm.

A specific example for obtaining the transfer film A described above is as follows. First, a silicone resin is applied to one side of a base film 1 made of a transparent polyester film having a thickness of 25 μm to a thickness of 1 μm. Release layer 2 was obtained. On the other hand, a mixture consisting of 1 part of zinc stearate, 9 parts of an acrylic resin, and 9 parts of toluene was dispersed in a ball mill for 1 hour to obtain a heat-resistant protective coating. The heat-resistant layer 3 was formed by applying the protective coating to a thickness of 2 μm. Subsequently, a thermoreversible recording layer-forming paint consisting of 5 parts of behenic acid, 20 parts of vinyl chloride / vinyl acetate copolymer, 40 parts of tetrahydrofuran, 20 parts of methyl ethyl ketone, and 20 parts of toluene was applied on the above-mentioned heat-resistant layer. After drying, a thermoreversible recording layer 4 having a thickness of about 20 μm was formed.

Aluminum is vapor-deposited on the thermoreversible recording layer 4 to form a metal vapor-deposited layer 5 of aluminum, and an adhesive 5 made of an acrylic resin is further formed thereon to a thickness of 2 μm. After coating, a thermoreversible recording heat-sensitive transfer film A was obtained.

When the obtained transfer film A was transferred to a material 7 made of a white polyethylene film by applying a pressure at 130 ° C. for 5 seconds, the heat-sensitive recording medium B having the thermoreversible recording layer 4 a formed thereon was transferred to the material. Was obtained (see FIG. 2). When printing was performed on this thermosensitive recording medium B with a commercially available printing printer, the printed portion was colored white and an image could be obtained. This was kept in an atmosphere of 80 ° C. for 60 seconds and returned to room temperature, whereupon the image area became transparent and could be erased. In FIG. 2, reference numeral 2a denotes a release layer, 3a denotes a heat-resistant layer, 5a denotes a metal deposition layer, and 6a denotes an adhesive layer.

[0020]

[Effect of the invention]

 In the present invention, a transfer film is formed by providing a release layer, a heat-resistant layer, a thermoreversible recording layer, a metal deposition layer, and an adhesive layer on a base film, and the transfer film is transferred onto a material by a metal thermocompression plate. As a result, a thermoreversible recording layer can be easily added to a prepaid card, a thick card, an IC card, a label, a name plate, and the like. Therefore, it is not necessary to form a white concealing layer in the non-printing area, and a thermoreversible thermosensitive recording layer is not required, and a remarkable effect that the transferred medium can repeatedly record and erase an image by a change in temperature. To play.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a transfer film according to the present invention.

FIG. 2 is a cross-sectional view of the thermal recording medium of the present invention.

FIG. 3 is a sectional view of a conventional thermosensitive recording medium.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base film 2 release layer 3 heat-resistant layer 4 thermoreversible recording layer 5 metal deposition layer 6 adhesive layer 7 material A transfer film B thermal recording medium

Claims (1)

[Utility model registration claims] 1. A release layer is provided on a base film, a heat-resistant layer, a thermoreversible recording layer, and a metal deposition layer are sequentially laminated on an upper surface of the release layer, and an adhesive layer is further provided on an upper surface of the metal deposition layer. A heat-sensitive recording medium using a transfer film obtained by transferring a transfer film to a material such as a card by a thermocompression bonding plate.