JP2019089241A - Thermal transfer medium and information recording body - Google Patents

Abstract

To provide a thermal transfer medium and an information recording body that enable authenticity determination on whether the information printed on the respective information recording bodies are genuine and also on whether there are traces of fraudulent acts such as alternation.SOLUTION: The thermal transfer medium includes on the side of its substrate in a frame sequential manner: one or more ink layer containing pigment; an ink primer layer that is invisible under the visible light and light emitting under special light; and an adhesive layer. A middle transfer foil that includes at least an overlay layer on the overlay base layer in a peelable manner is arranged opposite to the thermal transfer medium, and when the ink layer, the functional ink primer layer, and the adhesive layer are transferred onto the overlay layer in a predetermined pattern, the adhesive strength between the functional ink primer layer and the surface subject to transfer is smaller than the peeling strength between the adhesive layer and the surface subject to transfer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a thermal transfer medium for producing a personal identification medium represented by a passport, an ID card or the like, and an information recording medium using the same.

  Information recordings for which security is required, such as personal identification media represented by driver's licenses, passports, etc., credit cards, passbooks, etc., are widely used, and it is felt as one of the means to create this information recording. A thermal transfer medium (ink ribbon etc.) can be used.

  As a system for recording information using a thermal transfer medium, it can be roughly classified into two systems.

  In one method, an information recording medium substrate is brought into contact with a thermal transfer medium, and a dye is transferred onto the information recording medium substrate by heating with a thermal head or a laser to obtain an information recording medium directly. It is a system.

  On the other hand, another system arranges an intermediate transfer foil in which at least an overlay layer is releasably provided on a substrate and a thermal transfer medium, and heats a thermal head or the like to overlay the dye. This is an intermediate transfer system (or indirect transfer system) for obtaining an information recording medium by transferring the intermediate transfer foil image-formed with a dye onto the information recording medium substrate by transferring the image onto the information recording medium substrate.

  In general, a thermal transfer medium for producing the information recording medium is provided with an ink layer containing a pigment such as a pigment or a dye on a support, and in some cases, a release layer between the support and the ink layer. May be taken, or an adhesive layer may be provided on the ink layer.

In addition, the intermediate transfer foil is such that an overlay layer is provided on the overlay substrate so as to be peelable, and the overlay layer may be a single layer, or a peelable protective layer, an intermediate layer, an image receiving layer and the like are sequentially provided. The middle layer may be a picture layer, an optically variable element (OVD; Optical
(Variable Device) layer, etc., and is appropriately selected according to the application.

  The image receiving layer is to form information such as an image or a character by a thermal transfer medium, and may finally secure the adhesion to the information recording medium substrate.

  In the case of using the thermal transfer medium and the intermediate transfer foil as described above, the forgery-preventing property is exhibited by the effect of the optically variable element represented by the hologram or the like provided in the intermediate layer of the intermediate transfer foil. It is. While stereoscopic images and color changes expressed by holograms etc. have the advantage of being highly decorative and difficult to forge, it is also true that they can be viewed visually when those that have similar effects at first glance are substituted. When attempting to perform false determination, there is also a problem that it is difficult to determine unless an expert who performs true / false determination.

  Therefore, as means for enabling discrimination using a simple device, for example, in Patent Document 1, a colorless fluorescent ink containing a fluorescent substance is printed on a card using a conventionally known printing technique such as offset printing, It has been proposed to form an image.

However, such a method is suitable for forming a common latent image on certain cards, and it is good for identifying whether the card substrate used is genuine or not. In order to be able to determine whether or not the displayed contents of a given card are genuine, it is necessary to create a printing plate for each card, which is not realistic.

  Further, in Patent Document 2, a transparent protective layer is provided on the surface of a card on which information is printed via an adhesive layer, and the adhesive layer and / or the protective layer at that time substantially indicates the information printed on the card. A card configuration has been proposed that contains a photosensitive material (such as a fluorescent dye) that does not obscure itself.

  In this case, since the photosensitive material is provided so as to cover the printed information, it is necessary to remove the photosensitive material in order to falsify the printed information, so that it is easy to detect the fraud. I can say that.

  However, for example, when a protective layer containing a photosensitive material is provided in the face photo portion and it is desired to falsify the face photo information, the entire face photo information portion including the entire protective layer is also removed entirely to make another face If a photo is provided and a new protective layer is provided, it is judged whether it was not included as a result of falsification or was not included from the beginning, even if the photosensitive material was not included. Difficult situations may arise.

Utility model registration No. 3029273 Japanese Patent Application Laid-Open No. 3-159796

  The present invention has been made in view of the above problems, and is capable of determining whether the information printed on each information storage body is genuine or not, and also for tampering such as tampering It is an object of the present invention to provide a medium and an information recording medium capable of determining whether or not there is a trace.

The present invention has been made to solve these problems.
That is, according to the first aspect of the present invention, one side of the support includes one or more ink layers containing a dye, a functional ink primer layer which is invisible under visible light and emits visible light under special light, A thermal transfer medium provided with an adhesive layer at least in a face-sequential manner, wherein an intermediate transfer foil in which at least an overlay layer is releasably provided on an overlay substrate, and the thermal transfer medium are disposed opposite each other When each layer of the ink layer, the functional ink primer layer, and the adhesive layer is sequentially transferred to the image receiving layer in an arbitrary pattern by heating, the functional ink primer layer and the transfer target surface thereof The thermal transfer medium is characterized in that the peel strength between the adhesive layer and the adhesive layer is smaller than the peel strength between the adhesive layer and the transfer target surface.

  In the invention according to claim 2, the special light is ultraviolet light or infrared light, and the functional ink primer layer has a hue of at least one visible light region under ultraviolet light or infrared light. A thermal transfer medium according to claim 1, characterized in that it is observed.

The invention according to claim 3 is an information recording medium in which a functional ink primer layer, an ink layer and an overlay layer are laminated in this order on an information recording medium substrate via an adhesive layer, The ink layer constitutes one or more image forming units, and the functional ink primer layer is optional in an area similar to the image forming unit with respect to at least one image forming unit. And the functional ink primer layer is invisible under visible light and emits visible light under special light, and the functional ink primer layer, the overlay layer, and the overlay layer The information recording medium is characterized in that the peel strength between the ink layer and the ink layer is smaller than the peel strength between the adhesive layer, the overlay layer, and the ink layer.

  The invention according to a fourth aspect is the information recording medium according to the third aspect, wherein the area of the region similar to the image forming portion is larger than the area of the target image forming portion. .

  The invention according to claim 5 is characterized in that the image forming unit to be a target of the area similar to the image forming unit is an image for personal authentication including a photograph of a face. It is the information recording body as described in.

  In the invention according to claim 6, the special light is ultraviolet light or infrared light, and the functional ink primer layer has a hue of at least one visible light region under ultraviolet light or infrared light. The information recording medium according to any one of claims 3 to 5, which is observed.

  According to the present invention, a thermal transfer medium capable of producing an information recording medium which can easily determine whether an illegal action such as forgery or falsification has been made on an information recording medium which is a personal authentication medium such as a passport or an ID card An information record can be obtained.

FIG. 1 is a perspective view showing an example of a heat-sensitive transfer medium of the present invention. FIG. 2 is a conceptual view showing an example of an intermediate transfer type printing apparatus. It is a top view which shows the example of the information recording medium of this invention. It is sectional drawing which shows the example of the A-A 'cut surface of FIG. It is a top view which shows the example of the 1st image formation part of this invention. It is a top view which shows the example of the functional ink primer layer of this invention.

  Hereinafter, embodiments of the present invention will be described in detail. Although the drawings will be referred to as appropriate in the following description, the embodiments described in the drawings are illustrative of the present invention, and the present invention is not limited to the embodiments described in these drawings.

  Note that components having the same or similar function are denoted by the same reference numerals throughout the drawings, and redundant description will be omitted.

(Thermal transfer medium)
FIG. 1 is a perspective view showing an example of a thermal transfer medium (10) of the present invention.

  In FIG. 1, an ink layer (12) containing dyes of cyan (C), magenta (M) and yellow (Y) on a support (11), a functional ink primer layer (13), and an adhesive layer (14). ) Are shown in a face-sequential manner.

  As a support (11) which can be used for the heat-sensitive transfer medium (10) of the present invention, conventionally used ones generally used for sublimation transfer type and melt transfer type can be used.

Specifically, plastic films such as polyethylene terephthalate, polyethylene naphthalate, polypropylene, cellophane, polycarbonate, polyvinyl chloride, polystyrene, polyimide, nylon, polyvinylidene chloride, etc., paper such as capacitor paper, paraffin paper, etc. are exemplified. However, polyester-based films such as polyethylene terephthalate and polyethylene naphthalate are particularly preferable.

  The thickness of the support (11) may be 2 to 50 μm, and more preferably 2 to 16 μm.

  Depending on the circumstances, such a support (11) may be provided with a heat-resistant slip layer or the like on the surface opposite to the surface on which the various ink layers are provided, or on any surface. Various treatments or functional layers such as antistatic, easy adhesion, and mold release may be applied to the entire surface or any place.

  The ink layer (12) shown in FIG. 1 is of three types, cyan (C), magenta (M) and yellow (Y), but in addition to black (Bk), it is specially formulated depending on the application. There is no problem even if an ink layer such as a special feature is provided.

  Such an ink layer (12) may be of any type such as sublimation transfer type or melt transfer type, but in applications intended for personal authentication etc., from the viewpoint of high durability etc. A melt transfer type can be suitably used.

  The melt-type ink layer (12) mainly contains a pigment, a binder resin, waxes and the like.

  As the pigment, inorganic pigments, organic pigments and the like can be arbitrarily selected and used. Specifically, carbon black, phthalimide yellow, benzimidazolone orange, sulfonamide yellow, benzimidazolone yellow, for example And azo pigments such as phthalocyanine pigments, diketopyrrolopyrrole, quinophthalone, isoindolinone, diamino dianthraquinone and the like, but not limited thereto.

  These dyes may be used alone or in combination of two or more, and may be used by adding a dye or the like according to the situation.

  In addition, as the binder resin, ethylene-vinyl acetate copolymer, polyamide resin, rosin resin, acrylic resin, styrene resin, epoxy resin, urethane resin, polyester resin, etc. are exemplified, but it is limited to these. It can be used alone or as a mixture or composite.

  Waxes include plant waxes such as carnauba wax and candelilla wax, animal waxes such as beeswax, mineral waxes such as montan wax and ozokerite, and natural waxes such as petroleum waxes such as paraffin wax and microcrystalline wax, or It can be arbitrarily selected and used from synthetic waxes such as Fischer-Tropsch wax and polyethylene wax, oxidized waxes, and higher fatty acid metal salts such as zinc stearate.

  In addition, various additives such as a dispersant may be added to the ink layer (12) as needed.

  The functional ink primer layer (13) is a layer comprising a light emitting material which is invisible mainly under visible light and emits visible light under special light, and a binder.

Here, as the special light, light in the ultraviolet region or infrared region is suitably used, and invisible under visible light, that is, typically white or transparent, and special light such as ultraviolet light or infrared light. Any light emitting material that emits light in the visible light range when irradiated can be used.

  As a light emitting material which is excited by irradiation of ultraviolet light and emits light in the visible light range, for example, an inorganic fluorescent pigment, an organic fluorescent pigment and the like can be exemplified, and as an example of an inorganic fluorescent material, rare earth metal is used. Activated materials are known, and various materials such as thulium-activated yttrium vanadate, thulium-activated calcium tungstate, and europium-activated yttrium vanadate are known.

  Moreover, although a coumarin, a benzoxazine derivative, a europium complex etc. can be illustrated as an organic type fluorescent material, it is not necessarily limited to these.

Besides, CaWO ₄ , Zn ₂ SiO ₄ : Mn, Y ₂ O ₃ : Eu, Mg ₆ As ₂ O ₁₁ : Mn, Y ₃ Al ₅ O 12: Ce, ZnS: Ag, ZnO: Zn, Gd ₂ O ₂ S: Tb Inorganic fluorescent pigments such as Y ₂ O ₂ S: Eu, SrAl ₂ O ₄ : Eu, Dy, etc., organic fluorescent dyes such as benzoxazine derivatives, europium complexes, organic metal complexes and the like can be used.

As a phosphor excited by long wavelength ultraviolet light and short wavelength visible light (350 nm to 420 nm), BaMg ₂ Al ₁₆ O ₂₇ : Eu, (Sr, Ca, Ba) ₅ (PO ₄ ) ₃ Cl ₂ having a blue fluorescent color There are: Eu, green BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn, Zn ₂ GeO ₄ : Mn, red Y ₂ O ₂ S: Eu, 3.5 MgO · 0.5 MgF ₂ · GeO ₂ : Mn, and the like.

  It is known to produce many emission colors with long wavelength ultraviolet light and short wavelength visible light by mixing these three color phosphors at an arbitrary ratio.

  As a fluorescent material for converting infrared light into visible light, a photostimulable phosphor can be exemplified. Examples of the stimulable phosphors include infrared stimulable phosphors (CaS: Eu, Sm) in which europium (Eu) and samarium (Sm) are added to calcium sulfide (CaS).

  In addition, by using an upconversion type fluorescent material in which multiple photons act on one active ion and light emission occurs by being excited to a higher energy level, irradiation with infrared light causes a wavelength higher than that of irradiation light. Light emission in a short visible light range can be obtained.

  As such an upconversion type fluorescent material, crystals such as oxides of Ca, Ba, Mg, Zn, Cd and the like, sulfides, silicates, phosphates, tungstates and the like are mainly contained, Mn, Examples thereof include pigments obtained by adding metal elements such as Zn, Ag, Cu, Sb, and Pb or rare earth elements such as lanthanides as an activator and firing.

  It is possible to include various fluorescent materials as described above alone or as a mixture of two or more in the functional ink primer layer (13).

  Subsequently, as a binder used for a functional ink primer layer (13), as long as it is a substantially transparent thermoplastic resin, all can be used, for example, acrylic resin, styrene resin, polyester resin, Although epoxy resins, vinyl resins, rosin resins, polyamide resins and the like can be exemplified, they are not necessarily limited to these, and each thermoplastic resin may be used alone or as a mixture, or further as a copolymer, etc. Can be used as a composite of

  However, as a binder used for the functional ink primer layer (13), in comparison with an adhesive layer (14) described later, peeling between an overlay layer of an intermediate transfer foil described later and the ink layer (12) described above It is important that the material is of low strength.

  As a result, when an information recording medium as a final print product is obtained, the image formed by the ink layer (12) is removed in an attempt to falsify or alter this information recording medium. It is because it becomes possible to leave a trace. The factors that make it possible to leave a trace will be detailed later.

  Such a binder may have a method of imparting brittleness in order to reduce the peel strength, and a plasticizer, a filler, etc. may be added as a means of imparting brittleness.

  As the plasticizer, one having good compatibility with the thermoplastic resin used as a binder can be arbitrarily selected. Specifically, for example, alkyl benzyl phthalates such as octyl benzyl phthalate and myristyl benzyl phthalate, dialkyl phthalates such as dibutyl phthalate, dihexyl phthalate and dioctyl phthalate, phosphoric esters such as tricresyl phosphate and trioctyl phosphate, dibutyl sebacate, Fatty acid esters such as acetyl tributyl citrate, polyesters such as adipic acid based polyesters, sebacic acid based polyesters, phthalic acid based polyesters, glycol derivatives such as diethylene glycol dibenzoate and dipropylene glycol dibenzoate, glycerol triacetate, glycerol tributyrate and the like Can be exemplified by glycerin derivatives and epoxy derivatives of Not intended to be.

  Such plasticizers can be used alone or as a mixture of two or more, and the addition amount does not adversely affect the layers other than the functional ink primer layer (13) according to the selected material. The range can be set arbitrarily.

  The filler is for imparting brittleness to the functional ink primer layer (13), and as such a filler, for example, fused silica, aluminum hydroxide, barium sulfate, calcium carbonate, titanium oxide, clay Inorganic fillers such as calcined clay, talc, silica sand, pumice powder, mica, aluminum sulfate, aluminum white, and organic fillers such as polystyrene and styrene-acrylic copolymer hollow particles can be exemplified. However, it is not necessarily limited to these.

  Such fillers can be used alone or in combination of two or more, and the amount thereof added is, according to the selected material, at a level that does not impair the invisibility in the visible light region of the functional ink primer layer. It can be set arbitrarily.

  The adhesive layer (14) forms an image on the releasably provided overlay layer of the intermediate transfer foil, and then the information layer including at least the overlay layer, the ink layer (12) and the functional ink primer layer (13) It is a layer for adhering to a recording medium substrate, and a thermoplastic resin can be suitably used.

  Examples of thermoplastic resins used for the adhesive layer (14) include acrylic resins, polyester resins, polyurethane resins, polyamide resins, vinyl resins such as polyvinyl chloride and vinyl chloride-vinyl acetate copolymer, and chlorine Polyolefins, ethylene-acrylic copolymers, epoxy resins, rosin resins, etc. can be exemplified, but it is not necessarily limited thereto, and such thermoplastic resins may be used alone or in combination of two or more. Can be used as a mixture or composite of

  In addition to inorganic fillers and organic fillers, waxes may be added to such an adhesive layer (14) according to the situation without any problem.

(How to create an information record)
FIG. 2 is a conceptual view showing a method of producing an information recording medium by an intermediate transfer method using the above-mentioned thermal transfer medium (10) and an intermediate transfer foil (20), and FIG. 3 is a produced information recording body It is a top view which shows the example of (40).

  The intermediate transfer foil (20) is a substrate on which at least an overlay layer is provided releasably on the substrate, and the intermediate transfer foil (20) and the above-mentioned thermal transfer medium (10) are disposed opposite to each other. Heat is applied to the thermal transfer medium (10) using a laser or the like, and the ink layer (12) is first transferred onto the overlay layer to form the first image forming portion (41), as shown in FIG. And printing one or more image forming units such as the second image forming unit (42).

  At this time, for the portion printed using a plurality of ink layers (12), when printing of the first ink layer (12), for example, cyan (C) is finished, the ink layer to be used next ( 12) For example, while feeding the thermal transfer medium (10) to the beginning of magenta (M), the intermediate transfer foil (20) is rewound to the print start position of the next color of the intermediate transfer foil (20), Printing with the second ink layer (12) is carried out.

  The same operation is carried out until the desired printing is completed, and at least for the area provided with the first image forming portion (41), the primer layer similar to this first image forming portion (41) The functional ink primer layer (13) is transferred in an arbitrary pattern into the formation area (41a) in the same manner as the ink layer (12). Here, in FIG. 3, the contour of the similar shaped primer layer formation region (41a) is drawn by a broken line, but there is no contour visible at least under visible light, and the similar region In (41a), a functional ink primer layer (13) in the form of a pattern is formed.

  After that, on the layer including the overlay layer, the ink layer (12), the functional ink primer layer (13) and the like with respect to the region including at least the first image forming unit (41) and the second image forming unit (42). Transfer the adhesive layer (14) to

  Next, the printed part of the intermediate transfer foil (20) is conveyed to the transfer part by the heat roll (31), and the overlay layer, the ink layer (12), and the functionality of the information recording medium base (33). Each layer of the ink primer layer (13) is transferred through the adhesive layer (14). As described above, the information recording body (40) is created.

  Here, it is preferable that the first image forming unit (41) is image information such as a face photograph for personal authentication, and the second image forming unit (42) includes character information and the like and is not a face photograph. It is desirable that it is personal identification information.

(Information recording body)
FIG. 3 is a plan view showing an example of the obtained information recording body (40) as described above, and FIG. 4 is a cross-sectional view showing an example of a section cut along the line AA 'in FIG. .

  As shown in FIG. 4, the information recording medium (40) has an overlay layer (21), an ink layer (12), and a functional layer on the information recording medium base (33) through the adhesive layer (14). Each layer of the ink primer layer (13) is adhered.

  Here, as the material used for the information recording medium substrate (33), polyvinyl chloride resin, polyester resin such as polyethylene terephthalate and polyethylene naphthalate, acrylic resin, acrylonitrile-butadiene-, in addition to paper etc. Although styrene copolymers, polycarbonate resins, olefin resins such as polypropylene, and biodegradable plastics such as polylactic acid and polyethylene terephthalate succinate can be exemplified, they are not necessarily limited thereto.

  In addition, these materials may be added with an extender pigment such as titanium oxide, or may contain air bubbles or voids in the layer without any problem, and may be used as a single layer. It may be used as a laminate made of one or more materials.

  In the information recording medium substrate (33), there is no problem even if a printing layer or a coating layer is provided on any of the layers.

  The overlay layer (21) may be a single layer, or may be a laminate of a peelable protective layer, an intermediate layer, an image receiving layer and the like.

  The releasable protective layer in the case of the laminated constitution makes the overlay layer (21) easy to peel from the overlay substrate, for example, a polyester film such as polyethylene terephthalate or polyethylene naphthalate, and the like, as well as the information recording medium substrate (33). Function as a protective layer.

  The peelable protective layer can be formed of a resin and a peelable material, and as the resin, acrylic resin, chlorinated rubber resin, epoxy resin, vinyl chloride-vinyl acetate copolymer, cellulose resin, chlorination Polypropylene resin, polyester resin, melamine resin, etc. can be used, and as the releasable material, fluorine resin powder, polyethylene powder, animal wax, plant wax, mineral wax, petroleum wax, synthetic wax, high-grade Fatty acid metal salts can be used.

  As the intermediate layer, an optical variable element (OVD) or the like can be provided to enhance the forgery preventing effect, and for example, a hologram, a diffraction grating, or the like can be exemplified.

  As a hologram or a diffraction grating, any of a Lippmann type and a relief type may be used, but in the case of using a relief type, a relief structure forming layer and a light reflecting layer formed along the relief surface are used. Have.

  As the relief structure forming layer, various thermoplastic resins, thermosetting resins, radiation curable resins, etc. can be used.

  As a thermoplastic resin, a polycarbonate resin, a polystyrene resin, a polyvinyl chloride resin etc. can be illustrated, for example. Further, as the thermosetting resin, for example, unsaturated polyester resin, melamine resin, epoxy resin, urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, polyol (meth) acrylate, melamine (meth) Acrylate, triazine (meth) acrylate and the like can be exemplified.

  As the light reflection layer, a method of forming a metal thin film of Al, Cu, Ag, Au, Cr or the like in an arbitrary pattern, a method of forming a dielectric thin film of titanium oxide or zinc sulfide, or a metal thin film and dielectric A combination of body thin films can be used.

  As a method of forming a thin film of metal or dielectric, for example, a vapor deposition method such as a vacuum evaporation method or a sputtering method can be used, and when forming an arbitrary pattern, a conventionally known etching method etc. Can be used.

  The image receiving layer is a layer on which an image is formed using the thermal transfer medium (10), and has an acceptability of the ink layer (12), the functional ink primer layer (13), and the adhesive layer (14).

  Examples of the material of the image receiving layer include polyester, polyamide, polyacrylic acid ester, polycarbonate, polyurethane, polyvinyl acetal, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polystyrene, styrene-acrylic copolymer And styrene-butadiene copolymers, epoxy resins and the like, and these resins can be used alone or as a mixture.

  Moreover, fillers, an ultraviolet absorber, etc. may be added to the image receiving layer as needed.

  In the cross-sectional view shown in FIG. 4, the first image forming portion (41) and the second image forming portion (42) are formed by the ink layer (12) with respect to the overlay layer (21), and the first image forming portion The functional ink primer layer (13) is formed in a pattern on the area where the (41) is provided, and each layer is adhered to the information recording medium substrate (33) through the adhesive layer (14). It is understood that

  Here, the functional ink primer layer (13) is formed in an arbitrary pattern in a primer layer formation region (41a) similar to the first image formation portion (41) as shown in FIG. .

  At this time, it is desirable that the area of the primer layer formation region (41a) be larger than the area of the first image forming portion (41).

  This is because when the functional ink primer layer (13) is irradiated with special light, it is easy to confirm that the area confirmed by the emitted light is similar to the first image forming section (41), and Temporarily, if the first image forming unit (41) is tampered with, for example, forged or altered, the outline shape or printing position of the forged fraudulent image, and the remaining functional ink primer layer (13) This is to make it easy to compare the shape and the print position.

  FIG. 6 shows a pattern example of the functional ink primer layer (13) formed in the primer layer formation region (41a).

  The functional ink primer layer (13) provided in the primer layer formation region (41a) can be provided in any shape such as a straight line such as oblique lines, a curve, characters, numerals, symbols, and figures.

  However, when the functional ink primer layer (13) is confirmed under special light, it is desirable that the pattern shape is provided such that the outline of the primer layer formation region (41a) can be determined. Accordingly, the contour portion of the primer layer formation region (41a) may be transferred and formed by the functional ink primer layer (13).

  Here, the functional ink primer layer (13) is printed on the intermediate transfer foil (20) using a thermal head or the like, in which case it becomes the transfer target surface of the functional ink primer layer (13) The peel strength between the overlay layer (21) and the ink layer (12) is smaller than the peel strength between the overlay layer (21) and the ink layer (12) which is the transfer target surface of the adhesive layer (14) Materials are selected.

  Peeling strength can be measured by performing a cellophane tape peeling test (tensile speed 300 mm / min, 180 ° peeling) according to JIS Z 0237 using a tensiron tensile tester.

  The peel strength between the adhesive layer (14) and the surface to be transferred may be 6 N / 25 mm or more, more preferably 10 N / 25 mm or more.

  On the other hand, the peel strength between the functional primer ink layer (13) and the surface to be transferred may be less than 6 N / 25 mm, and more preferably 4 N / 25 mm or less.

  By selecting the adhesive layer (14) and the functional primer ink layer (13) as described above, the information recording medium (40) obtained as a final print product is a face photograph image area for personal authentication When trying to forge the first image forming portion (41) in an attempt to forge the first image forming portion (41), between the functional ink primer layer (13) and the transfer target surface of the functional ink primer layer (13), or the functional ink primer Peeling occurs between layers of layer (13).

  For this reason, when it is intended to peel off the first image forming portion (41), at least a part of the first image forming portion (41) records information according to the pattern shape of the functional ink primer layer (13). It will remain on the body (40) side.

  Therefore, forgery can be made difficult for a malicious third party who tries to conduct fraud.

  In addition, even if the first image forming portion (41) is completely removed, at least a part of the functional ink primer layer (13) remains on the information recording body (40) side, so that it is renewed. By comparing the outline shape and printing position of the provided incorrect image with the outline shape and installation position of the remaining functional ink primer layer (13), it is possible to easily determine whether or not the wrongdoing has been made. It becomes.

DESCRIPTION OF SYMBOLS 10 ... Thermal transfer medium 11 ... Support body 12 ... Ink layer C ... Cyan M ... Magenta Y ... Yellow 13 ... Functional ink primer layer 14 ... Adhesive layer 15 ... Thermal transfer medium unwinding part 16 ... Thermal transfer medium winding part 20 ... Intermediate transfer foil 21 ... Overlay layer 25 ... Intermediate transfer foil unwinding portion 26 ... Intermediate transfer foil winding portion 30 ... Thermal head 31 ... Thermal roll 32 ... Platen roller 33 ... Information recording medium base 40 ... Information recording medium 41 ... First image forming portion 41a ... Primer layer forming region (region having similar shape to first image forming portion)
42 ... second image forming unit

Claims (6)

At least one surface-sequentially provided on one side of the support with one or more ink layers containing a dye, a functional ink primer layer which is invisible under visible light and emits visible light under special light, and an adhesive layer Thermal transfer medium, and
An intermediate transfer foil in which at least an overlay layer is releasably provided on an overlay substrate, and the heat-sensitive transfer medium are disposed opposite to each other, and the ink layer, the functional ink primer layer, and each layer of the adhesive layer are the image receiving layer. When sequentially transferred in an arbitrary pattern by heating,
A thermal transfer medium characterized in that the peel strength between the functional ink primer layer and the transfer target surface is smaller than the peel strength between the adhesive layer and the transfer target surface. The special light is ultraviolet light or infrared light,
The heat-sensitive transfer medium according to claim 1, wherein the functional ink primer layer has a hue of at least one visible light region observed under ultraviolet light or infrared light. An information recording medium comprising a functional ink primer layer, an ink layer and an overlay layer laminated in this order on an information recording medium substrate via an adhesive layer,
The ink layer constitutes one or more image forming units, and the functional ink primer layer is optional in an area similar to the image forming unit with respect to at least one image forming unit. Are arranged in a pattern of
The functional ink primer layer is invisible under visible light and emits visible light under special light,
Peel strength between the functional ink primer layer and the overlay layer and the ink layer is smaller than peel strength between the adhesive layer and the overlay layer and the ink layer. Information record body.   4. The information recording medium according to claim 3, wherein the area of the area similar to the image forming area is larger than the area of the target image forming area.   The information recording medium according to claim 3 or 4, wherein the image forming unit to be a target of the area similar to the image forming unit is a personal authentication image including a photograph of a face. The special light is ultraviolet light or infrared light,
The information recording according to any one of claims 3 to 5, wherein the functional ink primer layer has a hue of at least one visible light region observed under ultraviolet light or infrared light. body.