JP7059578B2 - Thermal transfer medium and information recorder - Google Patents

Description

The present invention relates to a thermal transfer medium for creating a personal authentication medium such as a passport or an ID card, and an information recorder using the same.

Information recorders that require security, such as personal authentication media such as driver's licenses and passports, credit cards, and passports, are widely used, and I feel that they are one of the means to create this information recorder. A thermal transfer medium (ink ribbon or the like) can be used.

The methods for recording information using a thermal transfer medium can be roughly classified into two methods.

One method is direct transfer to obtain an information recorder by bringing the information recorder base material into contact with a heat-sensitive transfer medium and transferring the dye onto the information recorder base material by heating with a thermal head or a laser. It is a method.

On the other hand, in the other method, an intermediate transfer foil having at least a removable overlay layer on the substrate and a heat-sensitive transfer medium are arranged so as to face each other, and the dye is overlaid by heating with a thermal head or the like. This is an intermediate transfer method (or indirect transfer method) for obtaining an information recorder by transferring it onto an overlay and then thermally transferring the intermediate transfer foil image-formed by the dye to the information recorder substrate.

Generally, the heat-sensitive transfer medium for creating the information recording body is provided with an ink layer containing a pigment such as a pigment or a dye on a support, and in some cases, a peeling layer is provided between the support and the ink layer. , Or a means such as providing an adhesive layer on the ink layer may be taken.

Further, the intermediate transfer foil has an overlay layer that can be peeled off on the overlay base material, 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 intermediate layer may be a pattern layer, an optically variable element (OVD; Optical).
Variable Device) layer and the like, which are appropriately selected according to the intended use.

The image receiving layer may form information such as an image or characters by a thermal transfer medium, and may finally secure adhesiveness to an information recording body base material.

When a thermal transfer medium and an intermediate transfer foil are used as described above, anti-counterfeiting is exhibited by the effect of an optically variable element represented by a hologram provided in the intermediate layer of the intermediate transfer foil. Is. Three-dimensional images and color changes expressed by holograms have the advantage of being highly decorative and difficult to forge, but when a substitute with a seemingly similar effect is used, it is visually true. When attempting to carry out a false judgment, there is also a problem that it is difficult to make a judgment unless the expert makes a true / false judgment.

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

However, such a method is suitable for forming a common latent image for certain cards, and is good for identifying whether the card substrate used is genuine, but issuance. In order to be able to determine whether the displayed content of the printed card is genuine or not, it is necessary to create a print 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 captures the information printed on the card. A card configuration containing a photosensitive material (fluorescent dye, etc.) that does not conceal is proposed.

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 fraud is easily detected. I can say.

However, for example, if a protective layer containing a photosensitive material is provided on the facial photo portion and the facial photo information is to be tampered with, the entire facial photo information portion including the entire protective layer is also removed to create another face. When a photograph is provided and a new protective layer is provided, even if the photosensitive material is not contained, it is judged whether it was not contained as a result of tampering or was not contained from the beginning. Difficult situations can occur.

Utility Model Registration No. 3029273 Japanese Unexamined Patent Publication No. 3-159996

The present invention has been made in view of the above problems, and it is possible to determine whether or not the information printed on each information recorder is authentic, and it is possible to determine whether the information is genuine or not, and to perform fraudulent acts such as falsification. It is intended to provide a medium and an information recorder capable of determining whether or not there is a trace.

The present invention has been made to solve these problems.
That is, the invention according to claim 1 comprises one or more ink layers containing a dye on one side of the support, and a functional ink prime layer that is invisible under visible light and emits visible light under special light. An adhesive layer is a heat-sensitive transfer medium in which at least surface-sequentially provided , and an overlay layer having a structure in which a peelable protective layer, an intermediate layer, and an image receiving layer are laminated is provided on an overlay base material so as to be removable. The intermediate transfer foil and the heat-sensitive transfer medium are arranged so as to face each other, and the ink layer, the functional ink prime layer, and the adhesive layer are sequentially transferred to the image receiving layer in an arbitrary pattern by heating. The heat-sensitive transfer medium is characterized in that the peel strength between the functional ink prime layer and the transfer target surface thereof is smaller than the peel strength between the adhesive layer and the transfer target surface. be.

In the invention according to claim 2, the special light is ultraviolet light or infrared light, and the functional ink prime layer has at least one type of hue in the visible light region under ultraviolet light or infrared light. The heat-sensitive transfer medium according to claim 1, characterized in that it is observed.

The invention according to claim 3 is an information recording body in which a functional ink prime layer, an ink layer, and an overlay layer are laminated in this order on an information recording body base material via an adhesive layer. The ink layer constitutes one or more image forming portions, and the functional ink prime layer is arbitrary within a region having a shape similar to that of the image forming portion with respect to at least one image forming portion. The functional ink prime layer is invisible under visible light and emits visible light under special light, and the functional ink prime layer, the overlay layer, and the above are arranged. It is an information recording body characterized in that the peeling strength between the adhesive layer and the ink layer is smaller than the peeling strength between the adhesive layer, the overlay layer, and the ink layer.

The invention according to claim 4 is the information recording body according to claim 3, wherein the area of a region similar to the image forming portion is larger than the area of the target image forming portion. ..

The third or fourth aspect of the invention according to claim 5, wherein the image forming portion, which is the target of the region similar to the image forming portion, is an image for personal authentication including a facial photograph. It is an information recording body described in.

In the invention according to claim 6, the special light is ultraviolet light or infrared light, and the functional ink prime layer has at least one type of hue in the visible light region under ultraviolet light or infrared light. The information recording body according to any one of claims 3 to 5, characterized in that it is observed.

According to the present invention, in an information recorder which is a personal authentication medium such as a passport or an ID card, a thermal transfer medium and a heat-sensitive transfer medium capable of easily determining whether or not fraudulent acts such as forgery or alteration have been made are possible. An information recorder can be obtained.

It is a perspective view which shows the example of the thermal transfer medium of this invention. It is a conceptual diagram which shows the example of the printing apparatus of the intermediate transfer system. It is a top view which shows the example of the information recorder of this invention. It is sectional drawing which shows the example of the cut surface of AA' of FIG. It is a top view which shows the example of the 1st image forming 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 are appropriately referred to in the following description, the embodiments described in the drawings are examples of the present invention, and the present invention is not limited to the embodiments described in these drawings.

All the components exhibiting the same or similar functions are designated by the same reference numerals throughout the drawings, and duplicate description will be omitted.

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

In FIG. 1, an ink layer (12) containing cyan (C), magenta (M), and yellow (Y) dyes, a functional ink primer layer (13), and an adhesive layer (14) on a support (11). ) Indicates that the surfaces are sequentially provided.

As the support (11) that can be used for the thermal transfer medium (10) of the present invention, those generally used for sublimation transfer type and melt transfer type can be used.

Specific examples thereof include plastic films such as polyethylene terephthalate, polyethylene naphthalate, polypropylene, cellophane, polycarbonate, polyvinyl chloride, polystyrene, polyimide, nylon and polyvinylidene chloride, and papers such as condenser paper and paraffin paper. However, a polyester-based film such as polyethylene terephthalate or polyethylene naphthalate is particularly preferable.

The thickness of the support (11) may be 2 to 50 μm, but more preferably 2 to l6 μm.

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

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

As such an ink layer (12), any type such as a sublimation transfer type or a melt transfer type may be used, but in applications for the purpose of personal authentication or the like, from the viewpoint of high durability and the like, the ink layer (12) may be of any type. A melt transfer type can be preferably used.

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

As the pigment, an inorganic pigment, an organic pigment, or the like can be arbitrarily selected and used. Specifically, for example, carbon black, phthalimide-based yellow, benzimidazolone orange, sulfamide yellow, benzimidazolone yellow, etc. can be used. Such as azo pigments, phthalocyanine pigments, diketopyrrolopyrrole, quinophthalone, isoindolinone, diaminodianthraquinone and the like can be exemplified, but the present invention is not limited thereto.

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

Further, examples of the binder resin include ethylene-vinyl acetate copolymer, polyamide resin, rosin resin, acrylic resin, styrene resin, epoxy resin, urethane resin, polyester resin and the like, but the binder resin is not limited thereto. It can be used alone or as a mixture or composite.

Waxes include vegetable waxes such as carnauba wax and candelilla wax, animal waxes such as beeswax, mineral waxes such as montan wax and ozokerite, natural waxes such as paraffin wax and petroleum wax such as microcrystallin wax, or natural waxes. It can be arbitrarily selected from synthetic waxes such as Fisher Tropsch wax and polyethylene wax, oxide waxes, and higher fatty acid metal salts such as zinc stearate.

Further, there is no problem even if various additives such as a dispersant are added to the ink layer (12) as needed.

The functional ink prime layer (13) is a layer composed of a light emitting material and a binder, which are mainly invisible under visible light and emit visible light under special light.

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

Examples of the light emitting material that is excited by irradiation with ultraviolet light and emits light in the visible light region include inorganic fluorescent pigments and organic fluorescent pigments, and examples of the inorganic fluorescent material are rare earth metals. Activated materials and the like are known, and various materials such as yttrium-activated yttrium vanadate, yttrium-activated calcium tungstate, and europium-activated yttrium vanadate are known.

Further, examples of the organic fluorescent material include coumarins, benzoxazine derivatives, europium complexes and the like, but are not necessarily limited thereto.

In addition to this, CaWO ₄ , Zn ₂ SiO ₄ : Mn, Y ₂ O ₃ : Eu, Mg ₆ As ₂ O ₁₁ : Mn, Y3Al5O12: Ce, ZnS: Ag, ZnO: Zn, Gd ₂ O ₂ S: Tb , Y ₂ O ₂ S: Eu, SrAl ₂ O ₄ : Inorganic fluorescent pigments such as Eu, Dy, benzoxazine derivatives, organic fluorescent dyes such as europium complex, and organic metal complexes can be used.

Examples of the phosphor excited by long-wavelength ultraviolet light and short-wavelength visible light (350 nm to 420 nm) include BaMg ₂ Al ₁₆ O ₂₇ : Eu, (Sr, Ca, Ba) ₅ (PO ₄ ) ₃ Cl, which has a blue fluorescence color. : Eu, green BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn, Zn ₂ GeO ₄ : Mn, red Y2O2S: Eu, 3.5MgO / 0.5MgF ₂ / GeO ₂ : Mn and the like.

It is known that many emission colors are produced by long-wavelength ultraviolet rays and short-wavelength visible light by mixing these three color phosphors in an arbitrary ratio.

As a fluorescent material that converts infrared light into visible light, a bright fluorescent substance or the like can be exemplified. Examples of the bright fluorescent substance include an infrared bright fluorescent substance (CaS: Eu, Sm) in which europium (Eu) and samarium (Sm) are added to calcium sulfide (CaS).

In addition, by using an up-conversion type fluorescent material in which multiple photons act on one active ion and emit light when excited to a higher energy order, the wavelength is higher than that of the irradiation light by irradiation with infrared light. It is possible to obtain light emission in a short visible light region.

Such an up-conversion type fluorescent material contains oxides such as Ca, Ba, Mg, Zn, and Cd, sulfides, silicates, phosphates, and crystals such as tungstate as main components, and Mn. Examples thereof include pigments obtained by adding a metal element such as Zn, Ag, Cu, Sb, Pb or a rare earth element such as a lanthanoid as an activator and firing the mixture.

The various fluorescent materials as described above can be contained in the functional ink primer layer (13) alone or as a mixture of two or more.

Next, as the binder used for the functional ink prime layer (13), any substantially transparent thermoplastic resin can be used, for example, acrylic resin, styrene resin, polyester resin, and the like. Examples thereof include epoxy-based resins, vinyl-based resins, rosin-based resins, and polyamide-based resins, but the present invention is not limited to these, and each thermoplastic resin may be used alone or as a mixture, or as a copolymer. Can be used as a composite of.

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

As a result, when the information recorder, which is the final printed matter, is obtained, the image formed by the ink layer (12) is removed in an attempt to falsify or alter the information recorder, and the removed image is obtained. This is because it is possible to leave a trace. The factors that make it possible to leave traces will be described in detail later.

A method of imparting brittleness may be adopted for such a binder in order to reduce the peel strength, and a plasticizer, a filler or the like may be added as a means of imparting brittleness.

As the plasticizer, one having good compatibility with the thermoplastic resin used as the binder can be arbitrarily selected. Specifically, for example, alkylbenzyl phthalates such as octylbenzylphthalate and myristylbenzylphthalate, dialkylphthalates such as dibutylphthalate, dihexylphthalate and dioctylphthalate, phosphate esters such as tricresyl phosphate and trioctyl phosphate, and dibutyl sebacate, Fatty acid esters such as acetyltributylcitrate, adipic acid-based polyesters, sebasic acid-based polyesters, phthalates such as phthalates, glycol derivatives such as diethylene glycol dibenzoate and dipropylene glycol dibenzoate, glycerol triacetates, glycerol tributyrate, etc. Examples thereof include, but are not limited to, glycerin derivatives and epoxy derivatives.

Such a plasticizer can be used alone or as a mixture of two or more, and the amount added does not adversely affect the layers other than the functional ink primer layer (13) depending on the selected material. It can be set arbitrarily within the range.

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

Such fillers can be used alone or in admixture of two or more, the amount of which may be added at a level that does not impair the invisibility of the functional ink primer layer in the visible light region, depending on the material selected. It can be set arbitrarily.

The adhesive layer (14) forms an image on the overlay layer provided so that the intermediate transfer foil can be peeled off, and then informs the 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 the recording body base material, and a thermoplastic resin can be preferably used.

Examples of the thermoplastic resin used for the adhesive layer (14) include acrylic resin, polyester resin, polyurethane resin, polyamide resin, vinyl chloride resin such as polyvinyl chloride and vinyl chloride-vinyl acetate copolymer, and chlorine. Examples thereof include vinyl chloride, ethylene-acrylic copolymer, epoxy resin, rosin resin, and the like, but the present invention is not limited to these, and such thermoplastic resins may be used alone or in combination of two or more. Can be used as a mixture or composite of.

Depending on the situation, there is no problem even if waxes or the like are added to the adhesive layer (14) in addition to the inorganic fillers and the organic fillers.

(How to create an information recorder)
FIG. 2 is a conceptual diagram showing a method of creating an information recording medium by an intermediate transfer method using the thermal transfer medium (10) and the intermediate transfer foil (20) as described above, and FIG. 3 is a conceptual diagram showing the created information recorder. It is a top view which shows the example of (40).

The intermediate transfer foil (20) is provided on a base material so that at least an overlay layer can be peeled off. The intermediate transfer foil (20) and the above-mentioned heat-sensitive transfer medium (10) are arranged so as to face each other, and a thermal head (30) is provided. ), A laser, or the like, heat is applied to the thermal transfer medium (10), and the ink layer (12) is first transferred onto the overlay layer. In addition, printing of one or more image forming portions such as the second image forming portion (42) is performed.

At this time, for the portion to be printed using the plurality of ink layers (12), the ink layer (12) to be used next is used when the printing of the first ink layer (12), for example, cyan (C) is completed. 12), for example, the thermal transfer medium (10) is sent to the beginning of the magenta (M), and the intermediate transfer foil (20) is rewound to the printing start position of the next color of the intermediate transfer foil (20). Printing is performed by the second ink layer (12).

After the same operation is performed until the desired printing is completed, the prime layer having a similar shape to the first image forming portion (41) is applied to the region provided with at least the first image forming portion (41). In the formation region (41a), the functional ink prime layer (13) is transferred to an arbitrary pattern in the same manner as the ink layer (12). Here, in FIG. 3, the contour portion of the similar-shaped primer layer forming region (41a) is drawn by a broken line, but at least there is no visible contour line under visible light, and the similar-shaped region. A patterned functional ink prime layer (13) is formed in (41a).

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

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

Here, it is desirable 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 other than the face photograph. It is desirable that it is personal authentication information.

(Information recorder)
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 the AA'cut surface of FIG. ..

As shown in FIG. 4, the information recording body (40) has an overlay layer (21), an ink layer (12), and functionality with respect to the information recording body base material (33) via an adhesive layer (14). Each layer of the ink prime layer (13) is bonded to each other.

Here, as the material used for the information recording body base material (33), in addition to paper and the like, a polyvinyl chloride resin, a polyester resin such as polyethylene terephthalate and polyethylene naphthalate, an acrylic resin, and acrylonitrile-butadiene- Examples thereof include styrene copolymers, polycarbonate resins, olefin resins such as polypropylene, and biodegradable plastics such as polylactic acid and polyethylene terephthalate succinate, but the present invention is not limited thereto.

Further, these materials may be added with an extender pigment such as titanium oxide, there is no problem even if bubbles or voids are contained in the layer, and even if they are used as a single layer. It may be used as a laminate made of one or more kinds of materials.

Further, the information recording body base material (33) may have 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 have a structure in which a peelable protective layer, an intermediate layer, an image receiving layer, and the like are laminated.

In the case of the laminated structure, the peelable protective layer is such that the overlay layer (21) can be easily peeled off from the overlay base material, for example, a polyester film such as polyethylene terephthalate or polyethylene naphthalate, and the information recording body base material (33). After being transferred to, it functions as a protective layer.

The peelable protective layer can be formed from a resin and a peelable material, and the resin includes acrylic resin, rubber chloride resin, epoxy resin, vinyl chloride-vinyl acetate copolymer, cellulose resin, and chlorination. Polypropylene resin, polyester resin, melamine resin, etc. can be used, and as the peelable material, fluororesin powder, polyethylene powder, animal wax, plant wax, mineral wax, petroleum wax, synthetic wax, high-grade A fatty acid metal salt or the like can be used.

As the intermediate layer, an optically variable element (OVD) or the like that enhances the anti-counterfeiting effect can be provided, and examples thereof include a hologram and a diffraction grating.

As the hologram or diffraction grating, either a Lipman type or a relief type may be used, but when the relief type is used, 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, and the like can be used.

Examples of the thermoplastic resin include polycarbonate resin, polystyrene resin, polyvinyl chloride resin and the like. Examples of the thermosetting resin include unsaturated polyester resin, melamine resin, epoxy resin, urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, polyol (meth) acrylate, and melamine (meth). Examples thereof include acrylate and triazine (meth) acrylate.

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

As a method for forming a thin film of a metal or a dielectric, for example, a gas phase deposition method such as a vacuum vapor deposition method or a sputtering method can be used, and in the case of forming an arbitrary pattern, a conventionally known etching method or the like can be used. Can be used.

The image receiving layer is a layer on which an image is formed using the thermal transfer medium (10), and has receptivity to an ink layer (12), a functional ink primer layer (13), and an 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, and styrene-acrylic copolymer. , Styrene-butadiene copolymer, epoxy resin and the like can be exemplified, and these resins can be used alone or as a mixture.

Further, fillers, ultraviolet absorbers and the like may be added to the image receiving layer, if necessary.

In the cross-sectional view shown in FIG. 4, the ink layer (12) forms the first image forming portion (41) and the second image forming portion (42) with respect to the overlay layer (21), and the first image forming portion is formed. The functional ink prime layer (13) is formed in a pattern in the region provided with (41), and each layer is adhered to the information recording body base material (33) via the adhesive layer (14). You can see that it is.

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

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

This makes it easy to confirm that the region confirmed by the emitted light when the functional ink prime layer (13) is irradiated with special light has a shape similar to that of the first image forming portion (41). If the first image forming unit (41) is forged or altered, the contour shape and printing position of the forged image and the remaining functional ink prime layer (13) This is to make it easier to compare the shape and printing position.

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

The functional ink primer layer (13) provided in the primer layer forming region (41a) can be provided in any shape such as a straight line such as a diagonal line, a curve, a character, a number, a symbol, or a figure.

However, when the functional ink prime layer (13) is confirmed under special light, it is desirable that the functional ink prime layer (13) is provided as a pattern shape so that the approximate contour of the prime layer forming region (41a) can be discriminated. Accordingly, the contour portion of the primer layer forming region (41a) may be transferred and formed by the functional ink primer layer (13).

Here, the functional ink prime layer (13) is printed on the intermediate transfer foil (20) using a thermal head or the like, and at that time, it becomes a transfer target surface of the functional ink prime 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 are the transfer target surfaces of the adhesive layer (14). The material is selected.

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

The peel strength between the adhesive layer (14) and the transfer target surface 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 prime ink layer (13) and the transfer target surface may be less than 6N / 25mm, more preferably 4N / 25mm or less.

By selecting the adhesive layer (14) and the functional primer ink layer (13) as described above, the face photo image unit for personal authentication is used for the information recorder (40) obtained as the final printed matter. When the first image forming portion (41) is to be peeled off in an attempt to forge, the functional ink primer layer (13) is located 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 the layers of the layer (13).

Therefore, when the first image forming portion (41) is to be peeled off, 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 difficult for a malicious third party who intends to commit fraud.

Further, even if the first image forming portion (41) is completely removed, at least a part of the functional ink prime layer (13) remains on the information recording body (40) side, so that the first image forming portion (41) is completely removed. By comparing the contour shape and printing position of the provided fraudulent image with the contour shape and installation position of the remaining functional ink prime layer (13), it is possible to easily determine whether or not fraudulent activity has been performed. It becomes.

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

Claims (6)

On one side of the support, one or more ink layers containing a dye, a functional ink prime layer that is invisible under visible light and emits visible light under special light, and an adhesive layer are provided at least in a sequential manner. It is a heat-sensitive transfer medium
An intermediate transfer foil in which an overlay layer having a peelable protective layer, an intermediate layer, and an image receiving layer laminated on an overlay base material is provided so as to be removable, and the thermal transfer medium are arranged so as to face each other, and the ink layer, the said. When each layer of the functional ink primer layer and the adhesive layer is sequentially transferred to the image receiving layer in an arbitrary pattern by heating,
A thermal transfer medium characterized in that the peel strength between the functional ink primer layer and its transfer target surface is smaller than the peel strength between the adhesive layer and its transfer target surface. The special light is ultraviolet light or infrared light,
The thermal transfer medium according to claim 1, wherein the functional ink prime layer observes at least one type of hue in the visible light region under ultraviolet light or infrared light. An information recording body in which a functional ink primer layer, an ink layer, and an overlay layer are laminated in this order on a base material of an information recording body via an adhesive layer.
The ink layer constitutes one or more image forming portions, and the functional ink primer layer is arbitrary within a region similar to the image forming portion with respect to at least one image forming portion. It is arranged in the pattern of
The functional ink primer layer is invisible under visible light and emits visible light under special light.
The peel strength between the functional ink primer layer and the overlay layer and the ink layer is smaller than the peel strength between the adhesive layer and the overlay layer and the ink layer. Information recorder. The information recording body according to claim 3, wherein the area of the region similar to the image forming portion is larger than the area of the target image forming portion. The information recording body according to claim 3 or 4, wherein the image forming portion to be the target of the region having a similar shape to the image forming portion is an image for personal authentication including a facial photograph. 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 prime layer observes at least one type of hue in the visible light region under ultraviolet light or infrared light. body.

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