JP2537708B2 - Thermal transfer medium and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer medium used in a thermal transfer system, and in particular, ticket papers such as boarding tickets, commuter tickets, pass tickets, prepaid cards, ID cards,
The present invention relates to a heat transfer medium suitable for cards such as safety cards and labels such as POS labels, and a method for manufacturing the same.

[0002]

2. Description of the Related Art With the rapid development of OA and FA, various terminals are required, and in particular, there is a remarkable demand for recording devices such as facsimiles and printers for converting electric signals into visible images. The thermal transfer recording method is widely used for these terminals because the apparatus has advantages of being simple and compact, noiseless, and maintenance-free. Recently, the thermal transfer recording method is used in combination with a magnetic recording method to increase demand for ticket papers such as tickets, commuter passes, pass tickets, cards such as prepaid cards, ID cards, and safety cards, as well as physical distribution and distribution. It has come to be used for labels such as POS labels that are used. These ticket papers,
In order to obtain reliability and security, cards and labels have strict requirements, that is, image receptivity for obtaining transferred images of high quality and high resolution, water resistance, sweat resistance, oil resistance,
It is necessary to satisfy chemical resistance such as alcohol resistance, acid resistance, alkali resistance, and plasticizer resistance. Also, in the case of paper sheets and cards combined with the magnetic recording method, it is necessary to accurately read the bar code printed on the labels, because it passes through a device containing a magnetic head for reading the magnetic recording information at high speed. Wear resistance is also required due to its properties.

Further, in these heat-transferable media, it is necessary to print patterns, marks, characters, etc., so-called tint block printing on fare tickets, commuter tickets, pass tickets, etc. to prevent tampering. In addition, it is necessary to print frames, characters, etc. in addition to the transferred images in advance on the labels, etc. Furthermore, color printing and character printing should be performed in advance on cards such as ID cards and prepaid cards that also serve as advertising media. You may need to leave it. These prints are under the ink receiving layer (between the support and the ink receiving layer)
However, in consideration of the purpose of tint block printing, the manufacturing cost, and the support for small-lot production of a wide variety of products, it is necessary to provide it on the ink image receiving layer. Therefore, the ink image receptivity, chemical resistance, and abrasion resistance of the printed image portion itself become a problem.

In the conventional thermal transfer recording system, waxes such as paraffin wax and microcrystalline wax are mainly used on a support such as an extremely thin polyethylene terephthalate film, and higher fatty acids such as stearic acid and higher alcohols such as stearyl alcohol and dyes. , A thermal transfer ink layer composed of a coloring material composed of pigment, and a heat resistant protective layer composed of silicone resin, nitrocellulose, etc. on the opposite surface to prevent sticking with the thermal head A medium (ink ribbon) is superposed on the heat-transferable medium, and the heat-sensitive protective layer is used to heat the heat-sensitive head according to the recording information, and the heat-sensitive transfer medium is image-wise transferred onto the heat-transferable medium to form a desired image. Was formed. In this case, since the conventional thermal transfer medium is a polyethylene terephthalate film or polyethylene laminated paper that does not have ink receptivity to paper, the thermal transfer ink has a composition mainly composed of a soft wax in order to secure ink receptivity. It was However, when the heat-sensitive transfer ink mainly composed of the wax is transferred onto the heat-transferred medium, the abrasion resistance and the chemical resistance cannot be satisfied, and the transferred image has a drawback that it can be immediately removed by a nail or the like. Was. In order to improve this drawback, a wax having a low penetration such as carnauba wax, polyethylene wax, montan wax or the like, or a thermoplastic resin such as a polyester resin, an epoxy resin, an ethylene vinyl acetate copolymer resin or a polyamide resin is mainly used. Thermal transfer inks have been proposed. In particular, the heat-sensitive transfer ink mainly composed of the thermoplastic resin is effective in chemical resistance and abrasion resistance, and therefore has been rapidly developed recently.

However, even though these thermal transfer inks have been improved, the conventional thermal transfer medium has problems in image receiving property, abrasion resistance (fixing property), etc. of the thermal transfer ink, and is therefore practically sufficient. These characteristics cannot be satisfied. Furthermore, because the selection of the printing ink material for the print processing layer provided on the ink image receiving layer is not appropriate, there is a large difference in the ink image receiving performance between the ink image receiving layer and the print processing layer, and the chemical resistance and abrasion resistance of the transferred image. There were also differences in sex. That is, there are problems that the transferred ink image on the printed portion is unclear, the chemical resistance of the printed portion is low, and the abrasion resistance of the printed portion and the ink image thermally transferred onto the printed portion is poor. For these reasons, in the conventional thermal transfer medium, all of the image-receiving property, the chemical resistance and the abrasion resistance of the thermal transfer ink have not been satisfied at the same time.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a heat-sensitive transfer ribbon for use in a thermal transfer system, in particular, an ink image-receiving layer constituting a heat-transferred medium such as a ticket and a card, and a print processing layer provided on the ink image-receiving layer. Image receptivity to ink and chemical resistance,
The purpose is to improve wear resistance and further tamper resistance.

[0007]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have successively laminated an ink image-receiving layer for receiving a thermal transfer ink and a print treatment layer on a support. In the thermal transfer medium, the ink image-receiving layer contains at least one kind of polyester resin or epoxy resin, and the printing ink used for the print treatment layer contains at least one kind of polyester resin or epoxy resin,
The present invention has been completed by containing a polybutyral resin or at least one kind of a polyacetal resin and forming the print treatment layer by using a gravure printing method.

Next, the constituent materials and manufacturing method of the thermal transfer medium of the present invention will be described in detail below. The ink image-receiving layer constituting the heat-transferable medium of the present invention contains at least one kind of polyester resin or epoxy resin and a lubricant.
Examples of the polyester resin used in the ink image-receiving layer of the present invention include aliphatic polyester, polydimethylene malonate, polyethylene terephthalate, polytrimethylene terephthalate, polydiethylene glycol terephthalate, polyethylene isophthalate, polyethylene phthalate, polyethylene-1,5-. Naphthalate,
Polyethylene-1,4-naphthalate, polyethylene-
2,7-naphthalate, polyester (diethylene glycol-diphenylcarboxylic acid), polyester (bis-P-carboxyphenoxybutane-ethylene glycol) and the like can be mentioned, and they can be used alone or in combination of two or more. In the present invention, it is preferable to use a polyester resin having a glass transition temperature (hereinafter referred to as Tg) of 60 ° C. or higher as the polyester resin. That is, when Tg is higher than 60 ° C., chemical resistance and abrasion resistance can be further improved.

Examples of the epoxy resin used in the ink image-receiving layer of the present invention include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AD type epoxy resin, bisphenol S type epoxy resin, alicyclic epoxy resin, and phenol. Examples thereof include novolac type epoxy resin, cresol novolac type epoxy resin, and glycidyl ether type epoxy resin, which may be used alone or in combination of two or more kinds. In the present invention, it is preferable to use the epoxy resin having a softening point of 100 ° C. or higher. That is, the softening point is 100 ° C
When it is higher, more sufficient properties in chemical resistance and abrasion resistance can be obtained. The Tg and the softening point were all measured by the DSC method (heating rate 10 ° C / min, peak value in analysis).
Is required in.

As the lubricant to be blended in the ink image-receiving layer, carnauba wax, candelilla wax, polyethylene wax, polypropylene wax, ester wax, montan wax, montan wax derivative, oxidized microwax, Fischer-Trovsch wax, hardened castor oil. Waxes such as palmitic acid,
Higher fatty acids such as myristic acid, stearic acid and oleic acid, fatty acid amides such as palmitic acid amide, stearic acid amide and oleic acid amide, lauryl palmitate,
Stearyl stearate, stearyl behenate, esters of higher fatty acids such as behenyl behenate, stearyl alcohol, higher alcohols such as behenyl alcohol, zinc stearate, barium stearate, fatty acid metal salts such as calcium stearate, fine particles of fluorocarbon,
Etc. can be mentioned. Among these lubricants, polyethylene wax is particularly preferable in the present invention. The amount of the above-mentioned lubricant compounded is 0.5 to 30 parts by weight, preferably 3 to 15 parts by weight, based on 100 parts by weight of the total solid content in the ink image-receiving layer. If the blending amount is less than 0.5 part by weight, the friction coefficient of the ink image-receiving layer tends to be large and the abrasion resistance tends to be lowered. On the contrary, when the amount is more than 30 parts by weight, the image-receiving property and the fixing property of the heat-sensitive transfer ink tend to decrease.

The ink image-receiving layer of the present invention contains an appropriate amount of an inorganic or organic pigment, an antioxidant, a colorant, an antistatic agent, a curing agent, etc. in addition to the above-mentioned thermoplastic resin and lubricant, and is suitable. 0.01 to 20 μm, preferably 0.1 to 20 μm, preferably 0.1 to 20 μm on the support by a solvent coating method, various coating methods such as gravure printing and screen printing, and a printing method using a coating material obtained by dissolving or dispersing in a solvent. 10μ
It is provided to have a thickness of m.

The printing layer of the present invention uses a printing ink having a composition containing at least one polyester resin or epoxy resin and at least one polybutyral resin or polyacetal resin to form an ink image-receiving layer. Provided on top. As the polyester resin used in the print treatment layer, since the print treatment layer is required to have ink image receptivity, chemical resistance and abrasion resistance to the same thermal transfer ink as the ink image receptive layer, it is used in the ink image receptive layer. The polyester resin used is preferably used. The epoxy resin is the same as the polyester resin, and the epoxy resin used for the ink image receiving layer is applied. Further, the polybutyral resin or polyacetal resin used in the print treatment layer of the present invention is applied to improve tamper resistance. That is, as described above, tampering prevention is extremely important for ticket papers, commuter passes, etc.
For that reason, most of them have tint block printing. In the tamperproof property when printing is performed by the thermal transfer method, it is necessary that the chemical resistance and the abrasion resistance are slightly different between the tint block printing and the transfer printing. That is, both transfer printing and copy-forgery-inhibited pattern have sufficient resistance to chemical adhesion and rubbing due to accident or negligence, and when chemicals are used to erase the transfer printing or rubbing with an eraser, The transfer print must not disappear before the tint block. The polybutyral resin and the polyacetal resin of the present invention exhibit the tamperproof property in the present invention when used in coexistence with the polyester resin and the epoxy resin. The polybutyral resin used in the present invention preferably has a Tg of 60 ° C. or higher. If the Tg is higher than 60 ° C, the heat resistance, especially the permeation sealing performance tends to be further improved. The polyacetal resin used in the present invention has a low degree of acetalization,
That is, those having Tg of 90 ° C. or higher are preferable. Tg is 9
When the temperature is 0 ° C or higher, the water resistance tends to be further improved.
The blending amount of the polybutyral resin or polyacetal resin can be appropriately adjusted depending on the components of the heat-sensitive transfer ink ribbon and the ink image-receiving layer component of the heat-transferred medium.

The ink used in the print treatment layer of the present invention may contain a lubricant, a pigment, a colorant, an antistatic agent, a curing agent, etc., if necessary, in addition to the above-mentioned thermoplastic resin, and then mix them in a suitable solvent. It is formed by printing on the ink image-receiving layer by a gravure printing method using a printing ink obtained by dissolving or dispersing. The gravure printing method used to form the print treatment layer of the present invention is a method of supplying ink to a metallic gravure plate roll provided with fine dot-shaped concave portions in a printed image portion and removing unnecessary ink with a blade, and then forming concave portions. Is a method of printing by transferring the remaining ink to the substrate, and to print using solvent-based ink that satisfies the required characteristics such as ink image receptivity, chemical resistance, and abrasion resistance, the gravure printing method Is the most suitable. In printing methods other than the gravure printing method,
For example, in the screen printing method, the transferred image from the thermal transfer ribbon is bad due to the unevenness of the ink due to the large amount of ink, and in the flexographic printing method, the rubber roll is attacked by the solvent and long-term uniform printing cannot be performed. However, it is not practical because of problems such as plate material and drying.

The support used in the present invention includes polyethylene terephthalate, polyimide, polycarbonate,
Resin films such as cellophane, aromatic polyamide, polyorifine, and vinyl chloride, high-quality paper, coated paper, art paper, woven sheet, laminated paper, synthetic paper, metal plate, glass and the like can be used.

The surface of the heat-transferable medium of the present invention is desired to have good smoothness in order to improve the adhesion to the heat-sensitive transfer ink ribbon. That is, the Beck smoothness (JIS 8119-1976) of the ink image-receiving layer provided with the print processing layer is preferably 300 seconds or more, more preferably 500 seconds or more. In order to obtain such a value as the smoothness of the ink image receiving layer provided with the print processing layer, a support made of a resin film having high smoothness is used as the support, or an anchor coat layer is provided on the support. This can be achieved by providing a surface treatment such as calendering after providing the ink image-receiving layer or after providing the print processing layer.

The structure (layer structure) of the thermal transfer medium of the present invention will be described with reference to the drawings. FIG. 1 shows the basic structure of the heat transfer medium of the present invention. 2 to 4 are schematic cross-sectional views showing another embodiment of the heat transfer medium of the present invention, the present invention is not limited to these configurations. FIG. 1 shows a thermal transfer medium in which an ink image receiving layer 2 and a print processing layer 3 are provided on a support 1, and FIG. 2 shows an ink image receiving layer 2 and a print processing layer 3 are provided on a support 1 and vice versa. This is a thermal transfer medium in which an adhesive layer 4 and a release paper 5 are sequentially provided on the surface. In FIG. 3, an ink image receiving layer 2 and a print processing layer 3 are provided on a support 1, and a magnetic recording layer 6 and a protective layer are provided on the opposite surface. FIG. 4 shows a thermal transfer medium in which a layer 7 is sequentially provided. Further, FIG. 4 shows an ink image receiving layer 2 and a print treatment layer 3 provided on a support 1, and a magnetic recording layer 6, a hiding layer 8 and a second printing layer on the opposite surface. This is a thermal transfer medium in which a layer 9 and a protective layer 7 are sequentially provided.

The magnetic recording layer 6 contains a ferromagnetic powder such as γ-Fe ₂ O ₃ and barium ferrite in a binder such as polyester resin, vinyl chloride resin, polyurethane resin and vinyl chloride / vinyl acetate copolymer. If necessary, a pigment or the like is uniformly dispersed, and provided by a solvent coating method, gravure printing, or the like so as to have a thickness of 1 to 30 μm, preferably 3 to 15 μm on the support opposite to the ink image receiving layer. .

For the purpose of preventing forgery, a high magnetic permeability magnetic recording layer of sendust, permalloy or the like, and a magnetic recording layer of low coercive force of about 200 to 1000 oersted such as iron oxide magnetic powder are laminated by the above method. You can also do it. If necessary, a second printing layer 9 such as a company name, notes, commercials and various marks and patterns can be provided on the magnetic recording layer by printing such as gravure printing and flexographic printing. Here, in order to obtain a good second printed layer, it is better to provide a hiding layer 8 between the magnetic recording layer 6 and the second printed layer 9 in order to hide the coloring of the magnetic recording layer. The concealing layer can be formed by coating or printing a coating material in which a pigment such as aluminum paste or titanium oxide is uniformly dispersed in a resin such as polyester resin or polyurethane resin.

A protective layer 7 may be provided on the magnetic recording layer (or the second printed layer when the second printed layer 9 is set) for the purpose of protecting the surface of the magnetic recording layer 6. Examples of the binder for the protective layer include polyester resins, polyurethane resins, polystyrene resins, various fiber-based resins, polyimide resins, silicone resins, fluororesins, polyarylate resins, polycarbonate resins, phenol resins, epoxy resins, alkyd resins, and melamine. Examples include various thermoplastic resins and thermosetting resins such as resins and copolymers between these resins. The protective layer may be prepared by adding wax, silicone, pigment, etc. to the binder, kneading, or dissolving or dispersing in an appropriate solvent to obtain an ink or paint, which is solvent coating, gravure printing, flexo printing, screen. 0.01 to 10 on the magnetic recording layer (or the second printing layer when the second printing layer is set) by printing, offset printing, or the like.
It is provided to have a thickness of μm, preferably 0.1 to 5 μm.

[0020]

EXAMPLES The present invention will be specifically described below with reference to examples, but these examples do not limit the present invention. In addition, all compounding parts mean parts by weight. Example 1 Glass beads were added to the above mixed solution and dispersed for 2 hours with an attritor, and then 250 μm thick polypropylene-based synthetic resin (Oji Yuka Synthetic Paper Co., Ltd .: YUPO base paper FP25).
An ink image-receiving layer was formed by coating the support (0) with a solvent coating method so that the coating amount after drying was 2.0 μm. Glass beads were added to the above mixed solution and dispersed for 2 hours with an attritor to prepare an ink for a print processing layer. Next, a print treatment layer was formed on the ink image-receiving layer by a gravure printing method using the ink to obtain a heat transfer medium of the present invention. As the gravure printing plate, a plate having a plate depth of 25 μm and a number of lines of 175 and a mesh pattern was used.

Example 2 After dispersing the above mixed solution in a ball mill for 8 hours, Add the above curing agent and disperse for an additional 1 hour, then add a thickness of 188
It is applied by a solvent coating method on a support made of a milky-white polyethylene terephthalate film having a thickness of μm, and while the coating material is in an undried state, an orientation treatment is performed by a magnetic field orientation treatment device, and the coating is dried at 100 ° C. for 5 minutes to have a thickness of 15
A μm magnetic recording layer was formed. The above-mentioned mixed solution was stirred with a disper to dissolve the binder, and then was coated on the above-mentioned magnetic recording layer by a solvent coating method so that the coating thickness after drying was 3.0 μm to form a protective layer. .

[0022] Glass beads were added to the above mixed solution and dispersed by an attritor for 2 hours, and then the surface of the support opposite to the laminated side was coated by a solvent coating method so that the coating thickness after drying was 2.0 μm. Then, an ink image receiving layer was provided. Glass beads were added to the above mixed solution and dispersed for 2 hours with an attritor to prepare an ink for a print treatment layer, and the ink was used to form a print treatment layer on the ink image receiving layer by a gravure printing method. A heat transfer medium of the present invention was obtained. As the gravure printing plate, a plate having a plate depth of 25 μm and a number of lines of 175 and a mesh pattern was used.

Example 3 A thermal transfer medium of the present invention was obtained in the same manner as in Example 2 except that the formulation of the ink for the print processing layer was changed as follows.

Example 4 A thermal transfer medium of the present invention was obtained in the same manner as in Example 2 except that the formulation of the ink for the print processing layer was changed as follows.

Comparative Example 1 A thermal transfer medium for comparison was obtained in the same manner as in Example 2 except that the formulation of the ink for the print processing layer was changed as follows.

Comparative Example 2 A heat transfer transfer medium for comparison was obtained in the same manner as in Example 2 except that the formulation of the ink for the print processing layer was changed as follows.

Comparative Example 3 A thermal transfer medium for comparison was obtained in the same manner as in Example 2 except that the formulation of the print treatment layer was changed to the following.

Comparative Example 4 A thermal transfer medium for comparison was obtained in the same manner as in Example 2 except that the formulation of the print treatment layer was changed to the following.

Comparative Example 5 A comparative thermal transfer medium was obtained in the same manner as in Example 2 except that the print treatment layer was provided by UV printing. The following UV inks were used. The print pattern is 50% halftone dots.

Next, a method for producing a heat-sensitive transfer ink ribbon used for evaluating the heat-sensitive transfer medium of Examples and Comparative Examples will be described below. The excellent characteristics of the heat-sensitive transfer medium of the present invention are the heat-sensitive transfer ink ribbons. It is not limited by
First, a heat-resistant layer made of silicon resin having a thickness of 0.5 μm was set on a polyethylene terephthalate film having a thickness of 4.5 μm. Next, a thermal transfer ink obtained by dispersing the following mixed solution with an attritor for 2 hours was applied on the surface opposite to the heat-resistant layer by a solvent coating method to give a coating amount of 3 μm.
The thermal transfer ink ribbon used in the present invention was obtained by setting so as to be m.

Using the above heat-sensitive transfer ink ribbon, the surface smoothness, sweat resistance, oil resistance, alcohol resistance, acid resistance, alkali resistance of the heat transfer mediums of Examples and Comparative Examples were measured.
Table 1 shows the results of evaluation of various properties such as chemical resistance, which is plasticizer resistance, abrasion resistance, and transferability. Moreover, the measuring method and the evaluation method of each of the various characteristics are shown below. In addition,
"Ink image receptivity" with respect to the thermal transfer ink is shown as a result of comprehensive evaluation of various properties in Table 1. In addition, "tamperproof" is mainly (c) alcohol resistance, (f) gasoline resistance,
(H) Practical characteristics that depend on wear resistance. (A) Surface smoothness Beck smoothness (JIS. 8119-1976) (b) Transferability High-density thermal printer (printer equipped with a thermal head of 8 dots / mm: printing energy;
65 mJ / dot, pulse width; 1.5 ms) and the above ink ribbon were used to perform transfer, and image density unevenness, uniformity, sharpness, and the presence or absence of random bridges and voids were evaluated. All evaluations are visual evaluations using enlarged photographs and the like. ○: All evaluation items are satisfied. B: Only one evaluation item has a defect. X: The evaluation item has two or more defects. (C) Alcohol resistance The thermal transfer medium transferred by the printer of (b) is immersed in ethanol for 2 minutes, then immersed in a high gauze wrapped around a metal cylinder of 8φ, and the pressure is about 1 kg / cm ² . The transfer surface was rubbed with and the change of the transfer surface was examined. ◯: Peeling, scratches, discoloration, and erasing of the transferred image area and the print processing layer are hardly seen. Δ: Peeling, scratches, discoloration, and discoloration of the transfer image part are slightly seen with the print processing layer left. ×: Transfer image part disappears while the print processing layer is completely left. (D) Acid resistance pH 3 5% acetic acid aqueous solution is used. The evaluation method complies with (c). (E) Alkali resistance pH 12, 1N sodium hydroxide aqueous solution is used. The evaluation method complies with (c). (F) Gasoline resistance Use gasoline. The evaluation method complies with (c). (G) Oil resistance After transferring with the printer of (b), a few drops of edible soybean oil was dropped on the transfer surface, and after 24 hours, the oil was wiped off with gauze to examine the change of the transfer surface. The evaluation method complies with (c). (H) Plasticizer resistance After transferring with a printer of (b), a plasticizer-containing plastic eraser was pressure-bonded to the transfer surface at a pressure of ² kg / cm ² , left for 24 hours, and then the plastic eraser was peeled off. The change of the transfer surface was examined. ○: No change at all Δ: Transfer surface to eraser (transfer image area, ink image receiving layer,
Printed layer) transfer, peeling, stains, etc. X: Transfer surface to eraser (transfer image area, ink image receiving area,
Transfer, peeling, and dirt of the print processing layer) are considerably seen. (I) Abrasion resistance After transfer with the printer of (b), a paperboard abrasion tester (manufactured by Kumagai Riki Kogyo Co., Ltd.) was used and a polishing sheet (manufactured by Sankyo Rikagaku Co., Ltd., product name Lapping Sheet WA # 8000) was used. Abrasion resistance of the transfer surface against room temperature: 20 ° C., load: 500
g / cm, rubbing frequency: 1000 reciprocations were examined under constant conditions. ◯: The transfer surface (transfer image portion, print processing layer, ink image receiving layer, etc.) is almost free from scratches, peeling and stains. B: At least one scratch, peeling, or stain on the transfer surface (transfer image portion, print processing layer, ink image receiving layer) is slightly seen. X: At least two scratches, peeling, or stains are seen on the transfer surface (transfer image portion, print processing layer, ink receiving layer), or even one is large. (J) Sweat resistance After immersion for 1 week in the artificial sweat solution (acidic and alkaline) specified in JIS L 0848-1978, the test of (h) is performed.

[0032]

[Table 1]

As is clear from Table 1, the heat-transferable medium of the present invention has a structure in which an ink image-receiving layer for receiving a heat-sensitive transfer ink and a print treatment layer are sequentially laminated, and the print treatment layer is a polyester resin, or Since it contains at least one kind of epoxy resin and at least one kind of polybutyral resin or polyacetal resin, chemical resistance such as sweat resistance, oil resistance, alcohol resistance, acid resistance, alkali resistance, and plasticizer resistance It is possible to improve the tamperproof property by satisfying various characteristics such as resistance and abrasion resistance, and to obtain excellent thermal transfer energy sensitivity and transfer quality.

The heat-transferable medium of the present invention is excellent in ink image receptivity, has chemical resistance such as alcohol resistance, gasoline resistance, sweat resistance and abrasion resistance and is tamper-proof.
Tickets, commuter passes, pass tickets, prepaid cards,
Cards such as ID cards and safety cards, and PO
It could be suitably used for labels such as S label.

[Brief description of drawings]

[Figure 1]

FIG. 4 is a cross-sectional view showing a structural example of a thermal transfer medium of the present invention.

[Explanation of symbols]

 1 Support 2 Ink Image Receiving Layer 3 Print Processing Layer 4 Adhesive Layer 5 Release Paper 6 Magnetic Recording Layer 7 Protective Layer 8 Shielding Layer 9 Second Printing Layer

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A 63-95988 (JP, A) JP-A 1-215588 (JP, A) JP-A 1-238987 (JP, A) JP-A 62- 25089 (JP, A) JP 2-196691 (JP, A) JP 2-24194 (JP, A) JP 1-198388 (JP, A) JP 64-47585 (JP, A) "Chemical Dictionary 8" Kyoritsu Publishing Co., Ltd. Showa 51 issue "Polyvinyl butyral"

Claims (2)

(57) [Claims] 1. A thermal transfer medium comprising a support and an ink image receiving layer for receiving a thermal transfer ink and a print treatment layer, which are sequentially laminated on the support, wherein the ink image receiving layer is at least one of a polyester resin or an epoxy resin. A heat-transferable medium containing a seed, wherein the print treatment layer contains at least one kind of a polyester resin or an epoxy resin and at least one kind of a polybutyral resin or a polyacetal resin. 2. When providing a print processing layer of a heat-transferable medium in which an ink image-receiving layer for receiving a heat-sensitive transfer ink and a print processing layer are sequentially laminated on a support, at least one kind of polyester resin or epoxy resin and poly A method for producing a thermal transfer medium, which comprises performing printing by a gravure printing method using a printing ink containing at least one of butyral resin and polyacetal resin.