JP2015003390A - Record medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a record medium which prevents counterfeit or alteration even counterfeit or alteration is performed by erasing display information of the record medium or by natural extinction, because the display information recorded on a lower layer clearly exists.SOLUTION: At least a base material 24, a heat-sensitive coloring layer 23, and an image reception layer 21 for receiving an ink layer of a melting type thermal transfer ink ribbon are laminated in this order, and heating means applies a predetermined heat pattern to the ink ribbon, and the ink layer of a pattern 25 corresponding to the applied heat pattern is transferred to the image reception layer 21, and on the heat-sensitive coloring layer 23, pattern color development corresponding to the heat pattern is generated.

Description

  The present invention relates to a recording medium, and more particularly to a recording medium excellent in tamper resistance or forgery prevention.

  In recent years, various recording media such as magnetic recording media, thermal recording media, optical recording media, magneto-optical recording media, and semiconductor recording media have been developed and put into practical use. Recording media include employee ID card, employee ID card, student ID card, admission ticket, meal ticket, admission ticket, pass card, ID card, driver's license such as driver's license, alien registration card, membership card, examination ticket, boarding Ticket, commuter pass, deposit and savings passbook, banknote, gift certificate, stock certificate, securities, lottery ticket, horse ticket, air ticket, play ticket, passport, point card, ID card, medical card, library use card, gasoline refueling card, key card, It has been developed and used for many purposes such as credit cards, prepaid cards, cash cards, and electronic money cards.

  Many of these are used as cards. The information described on the card may be read by a machine, but the recorded information displayed on the card may be erased by repeating the machine reading. For example, a commuter pass with electronic money (for example, SUICA (registered trademark)) can be used when it is used in an automatic ticket gate, ticket vending machine, payment machine, commuter pass issuing machine, etc. , The printed information such as the section or station through which it is routed, the date of issue, the place of issue, the expiration date, and the amount of money are erased and become unreadable.

  Even if SUICA (registered trademark) is erased, there is no problem because the information is actually recorded on the IC chip built in the card. The inconvenience that it is not seen arises. In a card or the like in which an IC chip is not built, there is a case where the value of the card itself is lost because the recorded information printed on the surface disappears. In addition, there is a risk of unauthorized use due to tampering with the recorded information.

  Therefore, as a technique cited for solving the above-described problem, Patent Document 1 discloses an anti-counterfeit paper that can easily determine authenticity by visual observation and that can be mechanically written and recognized by magnetic recording. And a ticket using the same.

JP-A-11-78326

  In the anti-counterfeit paper with a recording layer described in Patent Document 1 and a ticket using the anti-counterfeit paper, the anti-counterfeit paper is formed by intermittently exposing glittering threads by a special paper manufacturing method. That is, forgery prevention is performed by providing a heat-sensitive recording layer in a part of the exposed surface of the glittering thread. However, there is a problem that it is not possible to prevent falsification or counterfeiting of the printed information itself which has been thermally recorded. Therefore, to provide a recording medium that cannot be falsified or counterfeited by the fact that the display information on the recording medium is naturally extinguished or intentionally erased, and the display information recorded in the lower layer is revealed even if falsification or forgery is executed. It is intended.

  Accordingly, the recording medium according to the present invention solves the above-described problems by the following inventions. In addition, the code | symbol in the parenthesis attached | subjected to each following invention respond | corresponds with the code | symbol attached | subjected to drawing.

  According to a first aspect of the present invention, there is provided a recording medium capable of preventing falsification, wherein the recording medium receives at least the base material (24), the thermosensitive coloring layer (23), and the ink layer of the melt-type thermal transfer ink ribbon. The layer (21) is laminated in this order, a predetermined thermal pattern is applied to the ink ribbon by a heating means, and an ink layer having a pattern (25) corresponding to the applied thermal pattern is formed on the image receiving layer (21). The recording medium is characterized in that a color development (26) of a pattern corresponding to the thermal pattern is generated in the thermosensitive coloring layer (23) at the same time.

  According to a second aspect of the present invention, there is provided a recording medium according to the first aspect, wherein a protective layer (22) is provided between the thermosensitive coloring layer (23) and the image receiving layer (21). is there.

  A third invention according to the present invention is the recording medium according to the second invention, wherein the thickness of the protective layer (22) is in the range of 0.05 μm to 5 μm.

  A fourth invention according to the present invention is characterized in that, in the first invention or the third invention, the color development (26) of the pattern is the color development (26) of the pattern which cannot be erased after formation. It is a recording medium.

  According to the recording medium of the present invention, when the pattern formed on the image receiving layer is scraped with a hard material such as an eraser or a coin, it is formed on the image receiving layer for receiving the ink layer of the melt type thermal transfer ink ribbon by the thermal head of the melt type thermal transfer printer. Even if the pattern is erased, the pattern formed on the thermosensitive coloring layer is colored so that it cannot be erased after the formation, so that there is an effect of preventing falsification or forgery.

It is explanatory drawing of the tampering process in the conventional recording medium. It is explanatory drawing of the tampering prevention principle in the recording medium concerning this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram of a tampering process in a conventional recording medium. In FIG. 1, 11 represents an image receiving layer, 12 represents a substrate, and 13 represents a pattern.

  In FIG. 1, the recording medium is composed of an image receiving layer 11 and a substrate 12 (S1). S2 represents a state in which the pattern 13 transferred with the ink of the melt-type thermal transfer ink ribbon is formed by the thermal head of the thermal transfer printer. S3 represents a state in which the pattern 13 has been cut with a hard material such as an eraser or a coin, and is a state in which characters and images have disappeared visually.

  FIG. 2 is an explanatory diagram of the falsification preventing principle in the recording medium according to the present invention. In FIG. 2, 21 represents an image receiving layer, 22 represents a protective layer, 23 represents a thermosensitive coloring layer, 24 represents a substrate, 25 represents a pattern, and 26 represents color development of the pattern.

  The recording medium of the present invention is composed of an image receiving layer 21, a protective layer 22, a thermosensitive coloring layer 23, and a substrate 24, as indicated by P1 in FIG.

(Base material)
Examples of the material of the base material 24 include glassine paper, synthetic paper (polyolefin, polystyrene, polyester, etc.), high quality paper, medium quality paper, thin paper, sulfuric acid paper, paraffin paper, art paper, coated paper, cast coated paper, Various plastic films or sheets such as polyester, polyacrylate, polycarbonate, polyurethane, cellulose derivative, metal foil, polyethylene, ethylene-vinyl acetate copolymer, polypropylene, polystyrene, acrylic, and polyvinyl chloride are suitable. It is not limited. Moreover, as thickness of the base material 24, 10 micrometers-780 micrometers are preferable. More desirably, it is 50 μm to 200 μm. As the material when the substrate 24 is composed of the first member and the second member, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, ethylene terephthalate-ethylene isophthalate copolymer, polyethylene, polypropylene, poly Polyolefin resins such as methylpentene, polyfluorinated ethylene resins such as polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, polyamides such as nylon 6 and nylon 6.6, poly Vinyl chloride, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, vinyl polymers such as vinylon, biodegradable aliphatic polyester, biodegradable polycarbonate, Biodegradable Biodegradable resins such as lilactic acid, biodegradable polyvinyl alcohol, biodegradable cellulose acetate, biodegradable polycaprolactone, cellulose resins such as cellulose triacetate and cellophane, polymethyl methacrylate, polyethyl methacrylate, polyacryl Examples thereof include acrylic resins such as ethyl acid and polybutyl acrylate, and synthetic resins such as polystyrene, polycarbonate, polyarylate, and polyimide.

(Thermosensitive coloring layer)
As the thermosensitive coloring layer 23, a thermosensitive recording material using a thermochromic reaction between an electron donating color developing organic compound and an electron accepting developer was used. A leuco dye as an electron-donating color-forming organic compound and a phenol compound as an electron-accepting developer are dispersed in a binder at a high concentration and applied. When heated, the phenolic compound melts and at the same time the phenolic hydroxyl group becomes leuco. It is for coloring the dye. The phenolic compound means a compound having a phenolic hydroxyl group, and phenol, o-cresol, p-cresol, p-ethylphenol, t-butylphenol, 2,6-di-t-butyl-4-methylphenol. , Nonylphenol, dodecylphenol, styrenated phenol, 2-2'-methylene-bis (4-methyl-6-tert-butylphenol), α-naphthol, hydroquinone monomethyl ether, guaiacol, eugenol, p-chlorophenol, p-bromo Phenol, o-bromophenol, o-chlorophenol, 2,4,6-trichlorophenol, o-phenylphenol, p-phenylphenol, p- (p-chlorophenyl) phenol, o- (o-chlorophenyl) phenol, salicylic acid , P -Methyl oxybenzoate, ethyl p-oxybenzoate, propyl p-oxybenzoate, octyl p-oxybenzoate, dodecyl p-oxybenzoate, catechol, hydroquinone, resorcin, 3-methylcatechol, 3-isopropylcatechol, p-t-butylcatechol, 2,5-di-t-butylhydroquinone, 4,4'-methylenediphenol, bisphenol A, 1,2-dioxynaphthalene, 2,3-dioxynaphthalene, chlorocatechol, bromo Catechol, 2,4-dihydroxybenzophenone, phenolphthalein, o-cresolphthalein, methyl protocatechuate, ethyl protocatechuate, propyl protocatechuate, octyl protocatechuate, dodecyl protocatechuate, pyrogallol , Oxy Droquinone, phloroglucin, 2,4,6-trioxymethylbenzene, 2,3,4-trioxyethylbenzene, 2,3,5-trioxynaphthalene, tannic acid, phenolic resin, gallic acid, methyl gallate, gallic acid Ethyl, propyl gallate, butyl gallate, hexyl gallate, octyl gallate, dodecyl gallate, cetyl gallate, stearyl gallate and the like can be used. Examples of leuco dyes include triphenylmethanes such as crystal violet lactone and malachite green lactone; fluoranes such as 1,2-bento6-diethylaminofluorane; auramines such as N-benzoylauramine; and other phenothiazines: spiropyran. Leuco dyes such as those of the type are used. In order to form the thermosensitive coloring layer 23, first, a coating solution is prepared by dissolving or dispersing a leuco dye, a phenol compound and various additive components used as required in a suitable organic solvent. In this case, as the organic solvent, for example, alcohol, ether, ester, aliphatic hydrocarbon, aromatic hydrocarbon and the like can be used, and tetrahydrofuran is particularly preferable because of its excellent dispersibility. Although there is no restriction | limiting in particular about the ratio of a leuco dye and a phenol compound, A phenol compound is normally used in 50-700 mass parts with respect to 100 mass parts of leuco dyes, Preferably it is the range of 100-500 mass parts. Next, the thus-prepared coating solution is applied by a conventionally known means and dried to form a thermosensitive coloring layer. Although there is no restriction | limiting in particular about drying process temperature, It is desirable to dry at low temperature so that a leuco dye may not color. The thickness of the thermosensitive coloring layer thus formed is usually in the range of 1 to 10 μm, preferably 2 to 7 μm.

(Protective layer)
The protective layer 22 has a blocking function that makes it difficult for a chemical reaction between the image receiving layer 21 and the thermosensitive coloring layer 23 to occur, a thermally conductive function that allows heat to pass through, a light-transmitting function, a preserving function, It is provided to have a lubricating function. As the protective layer 22, a material was selected according to the type of the plastic resin binder of the image receiving layer 21 in order to maintain the interlayer structure between the image receiving layer 21 and the thermosensitive coloring layer 23. Specifically, an acrylic resin, a polyester resin, a polyvinyl acetate resin, a vinyl chloride-vinyl acetate copolymer, a combination of polyol / isocyanate, polyol / melamine, or the like can be preferably used. The thickness of the protective layer 22 is preferably in the range of 0.05 μm to 5 μm. When the thickness is less than 0.05 μm, the adhesion between the image receiving layer 21 and the thermosensitive coloring layer 23 becomes insufficient, and when the thickness exceeds 5 μm, the color development 26 of the pattern formed on the thermosensitive coloring layer 23 is achieved. This is not preferable because the color development sensitivity of the toner is lowered. Further, when the image receiving layer 21 functions as an image receiving layer / protective layer, the protective layer 22 is not necessary when the image receiving layer 21 and the thermosensitive coloring layer 23 do not interfere with each other and function independently. It is.

(Image receiving layer)
The image receiving layer 21 is a layer that receives the ink layer of the melt type thermal transfer ink ribbon by the thermal head of the melt type thermal transfer printer. The image receiving layer 21 is preferably a conventionally known thermoplastic resin, thermosetting resin, chemically reactive resin, electron beam curable resin, ultraviolet curable resin, visible light curable resin, or a mixture thereof. The thickness of the image receiving layer is preferably in the range of 0.5 μm to 50 μm (more preferably 3 μm to 30 μm). Although not shown, providing a heat-sensitive adhesive layer on the protective layer 22 side of the image receiving layer 21 enables strong adhesion to the protective layer 22 by heating.

  P2 in FIG. 2 is a pattern 25 recorded on the image receiving layer 21 that receives the ink layer of the melt type thermal transfer ink ribbon by the thermal head of the melt type thermal transfer printer, and is simultaneously transferred to the image receiving layer 21 and at the same time the thermosensitive coloring layer. 23 shows that the color development 26 having the same pattern as the pattern 25 is formed.

  P3 in FIG. 2 indicates a recording medium in which the pattern 25 has disappeared or is intentionally erased with a hard material or the like. In this case, even if the pattern 25 disappears, it is possible to visually confirm it because the color development 26 having almost the same pattern as the pattern 25 cannot be erased after formation.

  Specifically, the recording medium of the present invention has applications as a card, a film, a sheet, a tape, a magnetic disk, and an optical disk.

DESCRIPTION OF SYMBOLS 11 Image receiving layer 12 Base material 13 Pattern 21 Image receiving layer 22 Protective layer 23 Thermosensitive coloring layer 24 Base material 25 Pattern 26 Pattern coloring

Claims (4)

  In the recording medium capable of preventing falsification, the recording medium includes at least a base material, a heat-sensitive color developing layer, and an image receiving layer for receiving an ink layer of a melt-type thermal transfer ink ribbon in this order, and heating means for the ink ribbon A predetermined thermal pattern is applied, and an ink layer of a pattern corresponding to the applied thermal pattern is transferred to the image receiving layer, and at the same time, a color of the pattern corresponding to the thermal pattern is generated in the thermosensitive coloring layer. A recording medium characterized by that.   The recording medium according to claim 1, wherein a protective layer is provided between the thermosensitive coloring layer and the image receiving layer.   The recording medium according to claim 2, wherein the thickness of the protective layer is in the range of 0.05 μm to 5 μm. The recording medium according to claim 1, wherein the color of the pattern is a color of the pattern that cannot be erased after formation.

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