JP2019195916A - Heat sensitive transfer medium and information recording body - Google Patents

Abstract

To provide a heat sensitive transfer medium having no need for a pretreatment process to an information recording body, and with which personal information printed on individual information recording body is hardly forged and modified, and an information recording body.SOLUTION: There is provided a heat sensitive transfer medium used together with an intermediate transfer foil, and having one or more ink layer containing a dye on a single sided surface of a supporter, and a primer layer arranged at least in a face order, in which thickness of the primer layer is thicker than that of the ink layer.SELECTED DRAWING: Figure 1

Description

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

  Information recording media that require security, such as personal authentication media such as driver's licenses and passports, as well as credit cards and passbooks, are widely used. Thermal transfer media can be used.

  As a typical method of recording using a thermal transfer medium, an information recording medium substrate and a thermal transfer medium are brought into contact with each other, and an ink layer containing a dye is applied on the information recording medium substrate by heating a thermal head or the like. A direct transfer method in which an information recording body is obtained by transferring the toner onto the recording medium can be mentioned.

  However, in the case of the direct transfer method, there is a problem that it is difficult to ensure the printing quality and the adhesive strength of the ink layer when printing on a rough substrate such as a paper substrate.

  With respect to such a problem, Patent Document 1 describes that panels made of a heat-meltable binder are provided on the same plane on both sides of a heat-meltable ink panel composed of a plurality of colors.

  This is a panel made of two heat-meltable binders provided on both sides of the ink panel, and the ink layer is sandwiched between them.

  However, it is not always a sufficient method for media that require high security and durability, such as passports and cards.

  In addition, in order to ensure the adhesive strength of the ink layer, there is also a method in which an adhesive is applied to the surface of the transfer medium in advance using screen printing or a bar coater. Therefore, simplification of the process of issuing the information recording body has been demanded.

JP-A-9-95064

  The present invention has been made in view of the above-described problems, and does not require a pretreatment process on the information recording medium, and forges or alters personal information printed on each information recording medium. It is an object of the present invention to provide a difficult thermal recording medium and an information recording medium.

The present invention has been made to solve these problems.
That is, the invention according to claim 1 is used together with an intermediate transfer foil, and is a thermal transfer in which one or more ink layers containing a pigment and a primer layer are provided on one side of a support at least in the surface order. A thermal transfer medium, wherein the primer layer is thicker than the ink layer.

According to a second aspect of the present invention, the one or more ink layers should be printed on one side of the support 1
It is provided in a panel unit for a screen, and the primer layer has an area at least twice as large as each ink layer, and the thickness of the primer layer is more than 1/2 of the thickness of the ink layer. The thermal transfer medium according to claim 1, wherein the thermal transfer medium is also thick.

  According to a third aspect of the present invention, the primer layer having an area at least twice as large as that of the ink layer is a panel unit for one screen to be transferred, and at least two screen panels are juxtaposed. The heat-sensitive transfer medium according to claim 2, wherein

  According to a fourth aspect of the present invention, the primer layer includes a first primer layer and a second primer layer, and the first primer layer is provided on substantially the entire surface of one side of the support. On the primer layer, the one or more ink layers and the second primer layer are provided in the surface order, and the sum of the first primer layer and the second primer layer is the ink layer. The thermal transfer medium according to claim 1, wherein the thermal transfer medium is thicker than the thickness of the thermal transfer medium.

  The invention according to claim 5 is an information recording body in which at least a primer layer, an ink layer, and an overlay layer are provided on an information recording medium base material, and at least the primer layer and the overlay layer include: The primer layer has substantially the same area in plan view, and the primer layer is thicker than the ink layer, and the peel strength between the information recording substrate and the primer layer is 6 N / cm or more. An information recording medium characterized by being. It is.

  The invention according to claim 6 is the information recording body according to claim 5, wherein the primer layer is composed of a plurality of layers of at least two layers.

  The invention according to claim 7 is the information recording body according to claim 5 or 6, wherein the total thickness of the primer layer is 1.0 μm or more and 10 μm or less.

  The invention according to claim 8 is the information recording body according to any one of claims 5 to 7, wherein the ink layer is formed with at least an image for personal authentication including a face photograph. is there.

  According to the present invention, in an information recording medium that is a personal authentication medium such as a passport or an ID card, a thermal transfer medium capable of easily creating an information recording medium that can be easily determined whether forgery or counterfeiting has been performed, and An information recording body can be obtained.

It is a perspective view which shows the example of the 1st aspect of the thermal transfer medium of this invention. It is a perspective view which shows the example of the 2nd aspect of the thermal transfer medium of this invention. It is a perspective view which shows the example of the 3rd aspect of the thermal transfer medium of this invention. It is a conceptual diagram which shows the example of an intermediate transfer system. It is a top view which shows an example of the information recording body of this invention. It is sectional drawing which shows the example of the 1st aspect of the information recording body of this invention. It is sectional drawing which shows the example of the 2nd aspect of the information recording body of this invention. It is sectional drawing which shows the example of the 3rd aspect of the information recording body of this invention.

  Hereinafter, embodiments of the present invention will be described in detail. In the following description, the drawings are referred to as appropriate, but 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.

  It should be noted that the same reference numerals are given to the constituent elements that exhibit the same or similar functions throughout the drawings, and redundant descriptions are omitted.

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

  In FIG. 1, an ink layer (12) and a primer layer (P1) containing pigments of cyan (C), magenta (M), yellow (Y), and black (Bk) are provided on a support (11). It shows how they are provided sequentially.

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

  Specific examples include plastic films such as polyethylene terephthalate, polyethylene naphthalate, polypropylene, cellophane, polycarbonate, polyvinyl chloride, polystyrene, polyimide, nylon, polyvinylidene chloride, and papers such as capacitor paper and paraffin paper. Particularly preferred are polyester films such as polyethylene terephthalate and polyethylene naphthalate.

  The support (11) may have a thickness of 2 to 50 μm, more preferably 2 to 16 μm.

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

  The ink layer (12) shown in FIG. 1 is cyan (C), magenta (M), yellow (Y), and black (Bk). There is no problem even if it is provided.

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

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

  As the coloring matter, inorganic pigments, organic pigments and the like can be arbitrarily selected and used. Specifically, for example, carbon black, phthalimide yellow, benzimidazolone orange, sulfoamide yellow, benzimidazolone yellow Examples thereof include, but are not limited to, azo pigments such as phthalocyanine pigments, diketopyrrolopyrrole, quinophthalone, isoindolinone, and diaminodianthraquinone.

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

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. It can be used alone or as a mixture or composite.

  Examples of waxes include plant 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 petroleum waxes such as paraffin wax and microcrystalline wax, or It can be arbitrarily selected from synthetic waxes such as Fischer-Tropsch wax and polyethylene wax, oxidized wax, and higher fatty acid metal salts such as zinc stearate.

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

  The thickness of the ink layer (12) of the thermal recording medium (10) in the present invention is preferably less than 1.2 μm.

  The primer layer (P1) is mainly made of a thermoplastic resin, and ensures adhesion between the ink layer (12) or an overlay layer of an intermediate transfer foil described later and an information recording medium substrate as a final printed matter. For example, acrylic resins, polyester resins, polyurethane resins, polyamide resins, vinyl resins such as polyvinyl chloride and vinyl chloride-vinyl acetate copolymers, chlorinated polyolefins, ethylene-acrylic copolymers, An epoxy resin, a rosin resin, and the like can be exemplified, but the present invention is not necessarily limited thereto, and such a thermoplastic resin can be used alone or as a mixture or composite of two or more. .

  There is no problem even if a wax or the like is added to such an adhesive layer (14) in addition to inorganic fillers and organic fillers depending on the situation.

  It is important that the primer layer (P1) in the first embodiment as shown in FIG. 1 is provided thicker than the thickness of the ink layer (12). It can be 2 μm or more.

  This is because sufficient adhesion between the ink layer (12) and the information recording medium substrate (33) is obtained when an image is formed on the information recording medium substrate (33) by the intermediate transfer system as shown in FIG. It is possible to make it difficult for a malicious third party to remove the image formed by the ink layer (12) and to alter the image.

(Second embodiment of thermal transfer medium)
FIG. 2 shows a second embodiment of the heat-sensitive recording medium of the present invention. Similar to the first embodiment, cyan (C), magenta (M), yellow (Y), black ( An ink layer (12) containing each pigment of Bk) and a primer layer (P2, P3) are provided in the surface order.

  Here, in the second aspect, the primer layer has an area at least twice as large as each ink layer, and the thickness of the primer layer is larger than ½ of the thickness of the ink layer. This is very important.

  Further, the primer layer may be provided as a single panel, or provided as a panel having at least two screens juxtaposed in units of one screen to be transferred as shown in FIG. It may be.

  In FIG. 2, the panel area of each ink layer and the panel area of one primer layer (for example, P2) are shown as substantially the same area, but these areas do not necessarily have to be the same.

  In other words, the color image forming ink layer (12) such as cyan (C), magenta (M), and yellow (Y) may be used only for forming a facial photographic image in applications such as passports and ID cards. In this case, only the area necessary for the face photo image formation may be provided, and the primer layer is not generally limited to the face photo image formation part, and covers almost the entire surface of the information recording body. In some cases, an overlay layer is formed, so that an area substantially equivalent to the area on which the overlay layer is to be transferred to the information recording body can be provided as one panel.

  The materials used for the support (11), each ink layer (12) and the primer layer (P2, P3) are the same as those shown in the first embodiment of the thermal transfer medium.

  For the primer layers (P2, P3) provided in two panel shapes, different materials may be used depending on the application, and the resin material to be used is the same, and added as a filler to be added. The material type and addition amount of the agent may be different.

  Moreover, the thickness of the primer layers (P2, P3) provided in two panel shapes can be made into substantially the same thickness.

(Third embodiment of thermal transfer medium)
FIG. 3 shows a third embodiment of the heat-sensitive recording medium of the present invention. A first primer layer (P4) is provided on almost the entire surface of one side of the support (11), and this first primer layer ( As in the first embodiment, an ink layer (12) containing cyan (C), magenta (M), yellow (Y), and black (Bk) pigments on one side of the support, Two primer layers (P5) are provided in the surface order.

  Here, it is important that the total thickness of the first primer layer (P4) and the second primer layer (P5) is thicker than that of the ink layer (12).

  However, if the first primer layer (P4) is too thick, in the intermediate transfer step shown in FIG. 4, the thermal head (30) is used to transfer the ink layer (12) of the thermal transfer medium (10) to the intermediate transfer medium. When printing on the overlay layer of (20), there is a possibility that the printing sensitivity will be lowered, and the gradation expression will be lowered due to the lowered cut-off of the ink layer.

  Therefore, when the first primer layer (P4) and the second primer layer (P5) are provided with different thicknesses, it is desirable to increase the thickness of the second primer layer (P5).

  The various materials used for the support (11), each ink layer (12), and the primer layer (P4, P5) in the third aspect of the thermal recording medium are the same materials as those shown in the first aspect. Can be used.

  Different materials may be used for the first primer layer (P4) and the second primer layer (P5) depending on the application, and the resin material to be used is the same, and the filler material to be added The kind of additive and the amount of additive may be different.

(How to create an information record)
FIG. 4 is a conceptual diagram showing a method for producing 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. 5 is a produced information recording medium. It is a top view which shows the example of (40).

  The intermediate transfer foil (20) is provided such that at least an overlay layer can be peeled off on a base material. The intermediate transfer foil (20) and the above-described thermal transfer medium (10) are arranged to face each other, and a thermal head (30 ) Or a laser or the like, and heat is applied to the thermal transfer medium (10). First, the ink layer (12) is transferred onto the overlay layer, whereby the first image forming unit (41), as shown in FIG. In addition, one or more image forming units such as the second image forming unit (42) are printed.

  At this time, with respect to a portion to be printed using a plurality of ink layers (12), after printing of the first ink layer (12), for example, cyan (C), 12) For example, the thermal transfer medium (10) is sent to the beginning of 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 by the second ink layer (12) is performed.

  Thereafter, in an area including at least the first image forming section (41) and the second image forming section (42), the entire area to be transferred to the information recording medium substrate (33) as a transfer target, The primer layer is transferred onto the layer including the overlay layer, the ink layer (12) and the like.

  At this time, when the thermal transfer medium (10) in the first embodiment of the thermal transfer medium described above is used, a primer layer (P1) thicker than the thickness of the ink layer (12) is formed by the thermal head (30). Heat and transfer is done.

  When the thermal transfer medium (10) in the second embodiment of the thermal transfer medium is used, the primer layer (P2) is first transferred to a predetermined position, and then the intermediate transfer foil (20) is transferred to the primer layer. Rewind to the position and transfer the primer layer (P3) to the predetermined position again. Accordingly, the primer layer transferred to the information recording medium base (33) has a two-layer structure.

  When the thermal transfer medium (10) according to the third aspect of the thermal transfer medium is used, the first primer together with the ink layer (12) is transferred when the ink layer (12) is transferred to the intermediate transfer foil (20). The layer (P4) is transferred, and then the first primer layer (P4) and the second primer layer (P5) are both transferred to a predetermined position.

  Accordingly, a primer layer having a two-layer structure in which the second primer layer (P5) and the first primer layer (P4) are laminated in this order is provided in the region of only the overlay layer where the ink layer (12) is not provided. In the region where the ink layer (12) is provided, a primer layer having a three-layer structure of the first primer layer (P4) / second primer layer (P5) / first primer layer (P4) is formed. Become.

  Next, the printed portion of the intermediate transfer foil (20) is conveyed to the transfer portion by the heat roll (31), and the overlay layer and the ink layer (12) are applied to the information recording medium substrate (33). Transferred through the layer. As described above, an information recording body (40) as shown in FIG. 5 is created.

  Here, the image printed on the information recording body (40) is not particularly limited, but the first image forming unit (41) is preferably image information such as a face photograph for personal authentication. The second image forming unit (42) preferably includes character authentication information and personal authentication information other than a face photograph.

(Information recording medium)
FIG. 5 is a plan view showing an example of the obtained information recording body (40) as described above, and FIGS. 6, 7, and 8 are examples of the AA ′ cut surface of FIG. FIG.

  FIG. 6 shows an example of an information recording body (40) produced by using the thermal transfer medium (10) shown in the first embodiment of the thermal transfer medium shown above. On the other hand, each layer of the overlay layer (21) and the ink layer (12) is adhered via a primer layer (P1) provided thicker than the ink layer (12).

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

  In addition, these materials may be added with extender pigments such as titanium oxide, and there is no problem even if bubbles or voids are included in the layer, or even a single layer may be used. It may be used as a laminate made of one or more materials.

  In addition, the information recording body (40) may be provided with a printing layer or a coating layer in any layer, or even if a magnetic recording layer, an IC chip, an antenna, or the like is provided, there is no problem.

  The overlay layer (21) may be a single layer, or may have a configuration in which a peelable protective layer, an intermediate layer, an image receiving layer, and the like are laminated.

  The peelable protective layer in the case of a laminated structure facilitates peeling of the overlay layer (21) from an overlay base material, for example, a polyester film such as polyethylene terephthalate or polyethylene naphthalate, and the information recording base material (33). It functions as a protective layer after being transferred to.

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

  As the intermediate layer, a durability-imparting layer, a special printing layer containing various fluorescent materials, a light absorber, or the like, or an optical variable element (OVD) that enhances the forgery prevention effect can be provided.

  In the case of forming the durability-imparting layer, for example, a coating layer made of a thermosetting resin or a radiation curable resin can be exemplified.

  In the case of special printing that includes fluorescent materials, light absorbers, etc., it cannot be viewed under normal visible light, but it can be read visually or by machine by irradiating with ultraviolet light or infrared light. Any printing layer containing possible materials can be used.

Examples of the material included in such a special printing layer include a fluorescent material that emits light in a wavelength range different from the light irradiated by irradiating ultraviolet rays or infrared rays, an absorber such as ultraviolet rays or infrared rays, and one An example is an up-conversion type fluorescent material that emits light when a plurality of photons act on the active ions and are excited to a higher energy level, but is not necessarily limited thereto.

  Further, when the intermediate layer is an optically variable element (OVD), for example, a hologram or a diffraction grating can be exemplified.

  As the hologram or diffraction grating, either a Lippmann type or a relief type may be used, but when a relief type is used, a relief structure forming layer and a light reflecting layer formed along the relief surface are provided. Have.

  For 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, and polyvinyl chloride resin. 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 an example of a radiation curable resin, typically, it can illustrate as what contains a polymeric compound and an initiator.

  Examples of the polymerizable compound include a compound capable of photoradical polymerization and a compound capable of photocationic polymerization, and each contains a radical generator or a cation generator as an initiator.

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

  As a method of forming a metal or dielectric thin film, for example, a vapor deposition method such as a vacuum evaporation method or a sputtering method can be used. When an arbitrary pattern is formed, a conventionally known etching method or the like is used. Can be used.

  The image receiving layer is a layer on which an image using the thermal transfer medium (10) is formed, and has receptivity such as an ink layer (12) and a primer layer (13).

  Examples of the material for the image receiving layer include polyester, polyamide, polyacrylate, polycarbonate, polyurethane, polyvinyl acetal, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polystyrene, 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.

  In addition, fillers, ultraviolet absorbers, and the like may be added to the image receiving layer as necessary.

FIG. 7 shows an example of an information recording body (40) produced using the thermal transfer medium (10) shown in the second embodiment of the thermal transfer medium shown above, and the information recording base (33) On the other hand, each layer of the overlay layer (21) and the ink layer (12) is bonded through a two-layer primer layer composed of a primer layer (P2) and a primer layer (P3).

  Each layer in this configuration is as described above, and it is important that the thickness of the primer layer (P2 or P3) in this configuration is 1/2 or more of the thickness of the ink layer (12). .

  Thereby, the total thickness of the primer layer provided on the ink layer (12) can be made thicker than the thickness of the ink layer (12), and sufficient adhesive force can be secured.

  FIG. 8 shows an example of an information recording body (40) produced by using the heat-sensitive recording medium (20) shown in the third embodiment of the heat-sensitive recording body, and the information recording medium base (33). On the other hand, with respect to each layer of the overlay layer (21) and the ink layer (12), the region including only the overlay layer (21) is composed of the second primer layer (P5) and the first primer layer (P4). In the region including the ink layer (12), the first primer layer (P4) / the second primer layer (P5) / the first layer is adhered to the information recording medium substrate (33) through the layered primer layer. The substrate is bonded to the information recording medium substrate (33) through a primer layer having a three-layer structure including one primer layer (P4).

  The total thickness of the primer layer in each information recording body (40) formed as described above may be 1.0 μm or more, preferably 1.2 μm or more, more preferably 2 μm or more and 10 μm or less.

  When the total thickness of the primer layer is less than 1.0 μm, it may be thinner than the thickness of the ink layer (12), and the first image forming unit (40) formed on the information recording body (40) 41) or the information of the second image forming unit (42) may be easily tampered.

  On the other hand, when the thickness exceeds 10 μm, when each primer layer is transferred to the intermediate transfer foil (20), the breakability of the primer layer is lowered, and burrs and the like are likely to occur.

  The peel strength between the primer layer thus formed and the information recording medium substrate (33) may be 6 N / 25 mm or more, and more preferably 10 N / 25 mm or more.

  The peel strength can be measured using a Tensilon tensile tester based on JIS Z 0237.

  By ensuring the peel strength as described above, it is possible to make it difficult to forge or tamper image information formed on the information recording body (40), that is, personal information.

  Further, by adopting an intermediate transfer method as an image forming method, an image formed by the ink layer (12) formed on the intermediate transfer foil (20) can be smoothly and uniformly covered with the primer layer. It becomes possible to fully exhibit the adhesive ability of the layer.

  Furthermore, by increasing the total thickness of the primer layer, it becomes possible to increase the peel strength and to provide a highly secure information recording body (40) that makes it difficult to forge or tamper personal information. .

DESCRIPTION OF SYMBOLS 10 ... Thermal transfer medium 11 ... Support 12 ... Ink layer C ... Cyan C ... 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 part 26 ... Intermediate transfer foil winding part 30 ... Thermal head 31 ... Heat roll 32 ... Platen roller 33 ... Information recording medium base material 40 ... Information recording medium 41 ... First image forming unit 42 ... second image forming unit

Claims (8)

  A thermal transfer medium used together with an intermediate transfer foil, wherein one or more ink layers containing a dye and a primer layer are provided on at least one surface of the support in a surface sequential manner, and the thickness of the primer layer However, the thermal transfer medium is thicker than the thickness of the ink layer.   The one or more ink layers are provided in units of a panel for one screen to be printed on one side of the support, the primer layer has an area at least twice as large as each ink layer, and The thermal transfer medium according to claim 1, wherein the primer layer has a thickness greater than ½ of the thickness of the ink layer.   3. The primer layer having an area at least twice as large as that of the ink layer is formed by juxtaposing at least two screen panels in a panel unit for one screen to be transferred. The thermal transfer medium described in 1.   The primer layer includes a first primer layer and a second primer layer, and the first primer layer is provided on substantially the entire surface of one side of the support, and the one or more layers are provided on the first primer layer. The ink layer and the second primer layer are provided in a surface sequence, and the sum of the first primer layer and the second primer layer is thicker than the thickness of the ink layer. The thermal transfer medium according to any one of claims 1 to 3. An information recording body comprising at least a primer layer, an ink layer, and an overlay layer on an information recording base material,
At least the primer layer and the overlay layer have substantially the same area in plan view,
The primer layer is thicker than the ink layer, and the peel strength between the information recording substrate and the primer layer is 6 N / cm or more.   The information recording body according to claim 5, wherein the primer layer includes a plurality of layers of at least two layers.   7. The information recording body according to claim 5, wherein a total thickness of the primer layer is 1.0 μm or more and 10 μm or less.   The information recording body according to claim 5, wherein the ink layer is formed by forming at least a personal authentication image including a face photograph.