JP2009113269A - Information recording body and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording body which is manufactured by using an intermediate transfer medium and a medium to be transferred configured in such a manner that an easy-adhesion layer is stacked to one surface of a base material layer, strong in adhesion between each layer, regardless of the kind of the base material layer of the medium to be transferred and hardly forged, and to provide the manufacturing method of the information recording body. <P>SOLUTION: The information recording body is configured in such a manner that from the peeling layer of the intermediate transfer medium having the peeling layer and an adhesion layer used also as an image receiving layer on which information is recorded on at least one surface of a supporting base material layer in this order to the adhesion layer used also as the image receiving layer of the intermediate transfer medium is heated and transferred to the easy-adhesion layer surface of the medium to be transferred configured in such a manner that the easy-adhesion layer comprising at least a thermoplastic resin and thermally expandable particles is stacked to one surface of the base material layer. Heat expanded particles configured in such a manner that the thermally expandable particles are expanded are any one or more of colorless particles, coloring particles, particles excited by ultraviolet light, to emit light in a visible wavelength region and particles emitting light in an infrared wavelength region. The information recording body and the manufacturing method of the information recording body are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information recording body such as a passbook, passport, driver's license, various certificates, and a method for manufacturing the same.

Information recording bodies are widely used as various certificates such as licenses, passports, etc. in which information such as images and characters is written in card or booklet shapes. As a means for producing the information recording body, there is a means for transferring and forming information on an intermediate transfer medium formed by carrying information such as images and characters by thermal transfer onto a transfer medium. The intermediate transfer medium capable of thermal transfer used for the preparation of the information recording body has, for example, a structure in which a release layer, an intermediate layer, and an image receiving layer / adhesive layer are sequentially laminated on one side of a support base material layer. After the image-receiving layer / adhesive layer side is superimposed on the transfer medium and heated and pressurized, only the supporting base material layer is peeled off, and the remaining release layer, intermediate layer, and image-receiving layer / adhesive layer are transferred. The image receiving layer / adhesive layer is a layer having an image receiving ability capable of recording image information (including characters, symbols, etc.) without a printing plate by a printing technique such as a thermal transfer printer or an ink jet printer. It is possible to provide an image with a dye or a pigment before transfer of the toner. As a method for forming information on the image receiving layer / adhesive layer, the intermediate transfer medium is transported to a transfer device comprising the main part of the drum and the thermal head, and the color material of the transfer ribbon is a heat transfer material. The layer is brought into contact with the image receiving layer / adhesive layer of the intermediate transfer medium, the thermal head is pressed from the transfer ribbon side, and the heating element group of the thermal head is appropriately heated on the basis of the image data, thereby generating the image data. An image pattern based thereon is formed and printed on the image receiving layer / adhesive layer. When the image data is multicolored, a transfer ribbon having a different color tone or a transfer ribbon having a color material layer having a different color tone is applied, and the same process is repeated to obtain a multicolor image on the image receiving layer / adhesive layer. A pattern is formed. The intermediate layer includes, for example, an OVD (Optical Variable Device) layer, which is provided as necessary. An information recording body having an anti-counterfeiting property using an intermediate transfer medium (for example, see Patent Document 1) has been proposed.
JP 2000-6555 A

  However, the proposed information recording body has different unevenness in the adhesion strength of the intermediate transfer medium due to the difference in the application of heat pressure at the uneven portions, such as when the surface of the substrate layer has unevenness, and the external load May cause partial damage. In particular, this problem is remarkable when the base material layer is paper. Depending on the type of paper, the fiber gap is large, so the intermediate transfer member and the base material layer do not adhere to each other in the gap portion, resulting in partial destruction. There was a problem.

  An object of the present invention is an information recording body manufactured using an intermediate transfer medium and a transfer medium in which an easy-adhesion layer is laminated on one side of a base material layer. An object of the present invention is to provide an information recording body and a method for manufacturing the same, in which the adhesion between the layers is strong regardless of the type and is difficult to forge.

  According to the first aspect of the present invention, there is provided an image-receiving layer / adhesive layer from a release layer of an intermediate transfer medium having at least a release layer and an image-receiving layer / adhesive layer on which information is recorded in the above order on one side of a support base material layer. Up to, an information recording body formed by heat-transferring to an easily adhesive layer surface of a medium to be transferred formed by laminating an easily adhesive layer composed of a thermoplastic resin and thermally foamable particles on one side of a base material layer, Heat-foamed particles formed by foaming the thermally foamable particles are colorless particles, colored particles, particles that are excited by ultraviolet light and emit light in the visible wavelength region, infrared light or infrared light that is excited by visible light and infrared wavelength region. Or it is any 1 or more types of particle | grains which light-emit in visible wavelength range, It is an information recording body characterized by the above-mentioned.

  The invention according to claim 2 of the present invention is the information recording body according to claim 1, wherein the easy-adhesion layer of the transfer medium contains a phosphor.

  The invention according to claim 3 of the present invention is the information recording body according to claim 2, wherein the phosphor has an average particle diameter of 1 to 10 μm.

  The invention according to claim 4 of the present invention is the invention according to any one of claims 1 to 3, characterized in that an average particle size of the thermally expandable particles is 10 μm or less when unexpanded. It is an information recording body.

  According to a fifth aspect of the present invention, a diffraction grating structure is formed between the release layer and the image receiving layer / adhesive layer of the information recording body according to any one of the first to fourth aspects. An information recording medium comprising an optical variable device (OVD) layer.

  An invention according to claim 6 of the present invention is an information recording body, wherein the information recording body according to any one of claims 1 to 5 is further provided with an embossed pattern.

  The invention according to claim 7 of the present invention is the invention according to any one of claims 1 to 6, wherein the heat-expandable particles in the easy-adhesion layer of the transfer medium are lower than the heat transfer temperature. It is an information recording body characterized by foaming.

  In the invention according to claim 8 of the present invention, the image receiving layer / adhesive layer side of the intermediate transfer medium having at least the release layer and the image receiving layer / adhesive layer on which information is recorded in the above order on one side of the support base material layer, The substrate layer is superposed on the easy-adhesion layer surface of the transfer medium, which is made by laminating an easy-adhesion layer consisting of thermoplastic resin and thermally foamable particles on one side, and is transferred by applying heat and pressure from the intermediate transfer medium side. A method for producing an information recording body, comprising: foaming heat-foamable particles in an easy-adhesion layer of a medium, and peeling off a support base material layer in a state where heat-foamed particles are generated.

  The invention according to claim 9 of the present invention is the method for manufacturing an information recording body according to the invention according to claim 8, wherein the easy-adhesion layer of the transfer medium contains a phosphor. .

  The invention according to claim 10 of the present invention is the method for manufacturing an information recording body according to the invention according to claim 8 or claim 9, wherein the surface is heated and pressurized with a heating roll having irregularities.

The information recording body of the present invention has at least a release layer on one side of the support base material layer, from the release layer of the intermediate transfer medium having the image receiving layer / adhesive layer in which information is recorded to the image receiving layer / adhesive layer in the above order, An information recording body formed by heating and transferring to an easy-adhesion layer surface of a medium to be transferred, wherein an easy-adhesion layer comprising a thermoplastic resin and thermally foamable particles is laminated on one side of a base material layer, Heat-foamed particles formed by foaming conductive particles are colorless particles, colored particles, particles excited by ultraviolet light and emitting in the visible wavelength region, infrared light or visible light excited by infrared wavelength region or visible wavelength Since any one or more of the particles that emit light in the region, forgery and alteration are difficult. In addition, forgery and tampering prevention effects are enhanced by including a phosphor in the easy-adhesion layer of the transfer medium. Furthermore, by providing an OVD (Optical Variable Device) layer or an embossed pattern in which the diffraction grating structure is formed on the information recording body, the effect of preventing forgery and tampering is further enhanced. In addition, the image-receiving layer / adhesive layer side of the intermediate transfer medium having at least the release layer and the image-receiving layer / adhesive layer on which information is recorded in the above order on one side of the support base layer is at least on one side of the base layer. Overlay the easy-adhesion layer surface of the transfer medium formed by laminating an easy-adhesion layer composed of a plastic resin and thermally foamable particles, and heat and press from the intermediate transfer medium side in the easy-adhesion layer of the transfer medium. In the state where the thermally foamable particles are foamed and the heat-foamed particles are generated, the support base material layer is manufactured by the method of peeling off, so even when the base material layer of the transfer medium is a paper having irregularities on the surface, The heat-foamable particles of the easy-adhesion layer of the transfer medium foam and the thermoplastic resin flows during the heat transfer of the intermediate transfer medium, and it is difficult to cause poor adhesion between the image receiving layer / adhesive layer and the easy-adhesion layer. Good adhesion.

  The information recording body and the manufacturing method thereof according to the present invention will be described in detail below along the embodiments. FIG. 2A is an enlarged side cross-sectional view showing an embodiment of a transfer medium used for the information recording medium of the present invention. The transfer medium (10) includes a thermoplastic resin (16) and a thermoplastic resin (16) in the thickness direction. It has the structure which laminated | stacked the easily bonding layer (12) which consists of a thermally foamable particle (17), and a base material layer (11). FIG. 2B is an enlarged side sectional view showing another embodiment of the transfer medium used in the information recording medium of the present invention. The transfer medium (10 ′) is in the order of the thermoplastic resin (16 ′) in the thickness direction. ), Heat-expandable particles (17) and phosphor (18), and an easy adhesion layer (13) and a base material layer (11) are laminated.

  Examples of the material used for the substrate layer (11) include paper, polyethylene terephthalate or polyethylene naphthalate polyester film, polyvinyl chloride film, polycarbonate film, polymethyl methacrylate film, polystyrene film, or the film or paper. Various combinations of laminated films can be used.

  As the kind of the thermoplastic resin (16), urethane resin, acrylic resin, vinyl acetate resin, or a mixed resin obtained by mixing the above resins can be used.

  The thermally foamable particles (17) are spherical particles formed by enclosing a liquid gas in an outer shell made of a thermoplastic resin, and foam at a temperature lower than the temperature at the time of heat transfer. As the resin used for the outer shell, polystyrene resin, polyolefin resin, polyurethane resin, polyvinyl chloride resin, colored resin in which each resin is kneaded with a dye, each resin is excited by ultraviolet light and emits light in the visible wavelength region. A resin kneaded with a fluorescent dye, a resin kneaded with a fluorescent dye excited with infrared light or visible light and emitting light in the infrared wavelength region or visible wavelength region, and the like are used. The average particle size is preferably 10 μm or less when unfoamed.

  The phosphor (18) emits light in the infrared wavelength region or visible wavelength region, and preferably has an average particle diameter in the range of 1 to 10 μm. If the thickness is less than 1 μm, the emission intensity may decrease. If the thickness exceeds 10 μm, the phosphor particles may jump out from the surface of the easy-adhesion layer, which causes various problems when transferring the intermediate transfer medium.

  The easy-adhesion layers (12, 13) can be formed by an ink in which the thermoplastic resin (16) and the thermally foamable particles (17) are dispersed and emulsified in water, or the thermoplastic resin (16) and the heat. The foamable particles (17) and the phosphors (18) are formed on the base material layer (11) by a known printing method such as screen printing using an ink dispersed in water and emulsified. The thickness is preferably 3 to 20 μm, and if it is less than 3 μm, problems such as difficulty in developing adhesive performance occur, and if it exceeds 20 μm, formation becomes difficult.

  FIG. 3 is a side sectional view showing an embodiment of an intermediate transfer medium used in the information recording medium of the present invention. The intermediate transfer medium (20) is composed of a supporting base layer (21) and a release layer in the thickness direction. (22), an intermediate layer (23) and an image receiving layer / adhesive layer (24) are laminated.

  The support base layer (21) is made of a material having a higher melting temperature or softening temperature than the material used for the image receiving layer / adhesive layer (24). For example, polyethylene terephthalate, polyethylene naphthalate, polyvinyl chloride, A synthetic resin film such as polyester, polycarbonate, polymethyl methacrylate, polystyrene or the like, or a composite of paper, synthetic paper or the like alone or in combination thereof can be used.

  The release layer (22) has excellent release properties when transferred to a transfer target, and functions as a protective layer after transfer. Materials used include acrylic resin, chlorinated rubber resin, vinyl chloride / vinyl acetate copolymer resin, cellulose resin, chlorinated polypropylene resin, or fluorinated ethylene powder, polyethylene powder, animal wax, plant Waxes, mineral waxes, natural waxes such as petroleum waxes, synthetic hydrocarbon waxes, fatty acid esters and glycerite waxes, hydrogenated waxes, synthetic ketone waxes, amine and amide waxes, chlorinated hydrocarbon waxes, Synthetic waxes such as synthetic animal waxes and alpha-olefin waxes, and anti-friction agents such as metal salts of higher fatty acids such as zinc stearate, and a mixture to which at least one of inorganic substances are added are used.

  Examples of the type of the intermediate layer (23) include a printed layer and an OVD (Optical Variable Device) forming layer. The OVD forming layer includes a hologram forming layer and a transmissive thin film layer, and the hologram forming layer is provided with a fine uneven pattern on the surface of the hologram forming resin layer. The resin for forming a hologram is preferably a resin having good embossing moldability, hardly causing press unevenness, obtaining a bright reproduced image, and having good adhesion to an adjacent layer. For example, polycarbonate resin, polystyrene resin, polyvinyl chloride resin, unsaturated polyester resin, melamine resin, epoxy resin, urethane (meth) acrylate resin, polyester (meth) acrylate resin, epoxy (meth) acrylate resin, polyol (meth) acrylate Resin, melamine (meth) acrylate resin, triazine (meth) acrylate resin or a mixture of the above resins, resins having a radical polymerizable unsaturated group, etc. can be used, and hologram images can be formed with other than the above Any material having excellent stability can be used. The transparent thin film layer is a transparent material for transmitting information of the hologram forming layer, and a higher refractive index than the hologram forming layer (refractive index n = 1.3 to 1.5) improves the decorativeness. preferable. Further, the transmissive thin film layer may be formed by superposing a plurality of layers, or may be a multilayer film in which layers of different refractive indexes are combined, or high refractive index layers and low refractive index layers are alternately laminated. Good. As a method for forming the transmissive thin film layer, film forming means such as sputtering and ion plating can be applied in addition to the vacuum deposition method, and the film thickness is preferably in the range of 10 nm to 1000 nm. . Note that the hologram includes volume phase holograms such as relief holograms and Lippmann holograms.

  The image receiving layer / adhesive layer (24) is made of a thermoplastic resin, and as the kind, vinyl chloride / vinyl acetate copolymer resin, polyester resin, polyamide resin, acrylic resin, or the like is used.

  FIG. 1A is an enlarged side sectional view showing an embodiment of an information recording body of the present invention. The information recording body 1 uses the intermediate transfer medium 20 and the transfer target 10. Easy adhesion consisting of release layer (22), intermediate layer (23), image receiving layer / adhesive layer (24), thermoplastic resin (16) and heat-foamed particles (19) in the thickness direction. The layer (14) and the base material layer (11) are laminated, (b) is an enlarged side sectional view showing another embodiment of the information recording body of the present invention, and the information recording body (2). Is formed using the intermediate transfer medium (20) and the transfer target (10 ′), and in the order of thickness, a release layer (22), an intermediate layer (23), and an image receiving layer / adhesive layer (24). ), An easily adhesive layer (15) comprising a thermoplastic resin (16), heat-foamed particles (19) and a phosphor (18), a base material It has become to the laminated structure (11).

  4A to 4C are explanatory views showing an embodiment of the method for producing an information recording body of the present invention. FIG. 4A is an image receiving layer / adhesive layer of the intermediate transfer medium (20). (24) A step of superimposing the side of the transfer medium (10) on the easy-adhesion layer (12) and applying heat (T) and stress (P) from the intermediate transfer medium (20) side to heat and pressurize. FIG. Information is recorded in advance on the image receiving / adhesive layer (24) of the intermediate transfer medium (20). FIG. 4B shows a thermal foaming process in which the thermally expandable particles (17) in the easy-adhesion layer (12) of the transfer medium (10) are foamed and the volume is expanded after the process of FIG. 4 (a). It is a figure which shows the state from which the surface unevenness | corrugation by the side of an image receiving layer and adhesive layer (24) of an easily bonding layer (14) is lose | eliminated as a finished particle (19) produces | generates and thermoplastic resin (16) flows. Accordingly, the adhesion between the image receiving layer / adhesive layer (24) and the easy-adhesive layer (14) is strengthened. In FIG. 4C, after the step of FIG. 4B, only the support base material layer (21) of the intermediate transfer medium (20) is peeled off by stress (P), and the release layer (22) and the intermediate layer (23 ) And a step of transferring the image receiving layer and adhesive layer (24).

  Further, although not shown, an embossed pattern can be formed on the information recording body itself by heating and pressurizing using a heating roll having a concavo-convex pattern on the surface in the step of FIG. .

Hereinafter, the information recording medium of the present invention will be described according to specific examples, but the present invention is not limited to these examples.
<Creation of colored thermally foamable particles>
A red dye “KAYASET RED SF-B” (manufactured by Nippon Kayaku Co., Ltd.) is dispersed in ethanol at 5% by weight, and heat-expandable particles (Nippon Philite Co., Ltd., trade name: EXPANCEL, 551-20) are immersed therein. Then, it was pulled up and dried to produce colored thermally foamable particles having an average particle diameter of 7 μm and a softening temperature of 100 ° C.
<Preparation of ink A used for easy-adhesion layer (12)>
Ink A was prepared by dispersing the colored foamable particles in an aqueous urethane emulsion at 5% by weight.
<Creation of ink B used for easy adhesion layer>
Ink B of a water-based urethane emulsion alone was prepared.
<Preparation of ink C used for easy adhesion layer (12)>
Infrared fluorescent pigment (average particle size D50 = 2.4 μm, D90 = 8.4 μm) 5% by weight in water-based urethane emulsion and thermally foamable particles (Nippon Philite Co., Ltd., trade name: EXPANCEL, 551-20) 5 Ink C in which wt% was dispersed was prepared.
<Creation of ink D used for easy adhesion layer>
Ink D was prepared by dispersing 5% by weight of an infrared fluorescent pigment (average particle size D50 = 2.4 μm, D90 = 8.4 μm) in an aqueous urethane emulsion.
<Creation of screen printing version>
A 300-line / inch mesh polyester cloth was applied to a 650 mm × 650 mm frame, an emulsion was coated on the cloth, and exposed using a separately prepared positive film to prepare a screen printing plate by a known method.

Using 180 Kg-based paper (Tokai Pulp Co., Ltd., straw) as the base material layer (11), first, using the screen printing plate prepared on the paper, the thickness of the ink A is 5 μm. The easy-adhesion layer (12) was formed, and a transfer medium (10) having a size of 90 mm × 55 mm was produced. Subsequently, as an intermediate transfer medium (20), an intermediate transfer film having a release layer (22) and an image receiving layer / adhesive layer (24) on a support substrate layer (21) is used. A card printer CP300FX device (manufactured by Toppan Printing Co., Ltd.) is used for the layer / adhesive layer (24) to form image information from a dedicated color ribbon, and then the surface temperature is 180 using the built-in heat roll of the device. The transfer speed is 6 mm / sec at 0 ° C., and the peel-off layer of the intermediate transfer film and the image-receiving layer / adhesive layer on which image information is formed are transferred onto the easy-adhesion layer (12) of the prepared transfer medium (10). Thus, an information recording body of the present invention was prepared.

  In Example 1, the information recording medium of the present invention was prepared in the same manner except that the transfer medium (10) having a size of 90 mm × 55 mm in which the easy adhesion layer (12) having a thickness of 5 μm was formed with the ink C was used. did.

  In the following, comparative examples of the present invention will be described.

  A comparative information recording medium was prepared in the same manner as in Example 1 except that a transfer medium having a size of 90 mm × 55 mm in which an easy-adhesion layer having a thickness of 5 μm was formed with ink B was used.

  A comparative information recording medium was prepared in the same manner as in Example 1 except that a transfer medium having a size of 90 mm × 55 mm in which an easy-adhesion layer having a thickness of 5 μm was formed with ink D was used.

<Evaluation>
Using the information recording material of the present invention of Example 1 and the information recording material for comparison of Example 3, a peeling test and a tampering test were performed and evaluated by the following methods. Furthermore, using the information recording material of the present invention of Example 2 and the information recording material for comparison of Example 4, a friction test was performed and evaluated by the following method. The results are shown in Tables 1 and 2.
(1) Peel test method After sticking an adhesive tape on the surface opposite to the base material layer of each created information recording body, the adhesive tape was peeled off, and the peeled state was visually evaluated.
(2) Tampering test method Using a methyl ethyl ketone solvent, the release layer of each information recording body and the image receiving layer / adhesive layer on which image information was formed were removed, and then the release layer of the intermediate transfer film was again formed thereon. The image receiving layer / adhesive layer on which the image information was formed was transferred to produce a falsified information recording body, which was compared with the original information recording body and evaluated.
(3) Friction test method The surface on the opposite side to the base material layer of each created information recording medium was subjected to 1000 times at a pressure of 9.8 × 10 ⁴ Pa using a friction cloth with a Gakushin friction tester. Reciprocating friction was evaluated.

表１に示すように、実施例１の本発明の情報記録体は、剥離テストの結果、全く剥離が無く、さらに、実施例１の本発明の情報記録体を用いて改竄した情報記録体は、一見して元の情報記録体と同様に見えたが、顕微鏡で観察したところ、加熱発泡済み粒子の消失や破壊が確認され、改竄跡が明瞭に判別できた。なた、一方、実施例３の比較用の情報記録体は、剥離テストの結果、受像層兼接着層と易接着層との層間で部分的な剥がれがあり、さらに、実施例３の比較用の情報記録体を用いて改竄した情報記録体は、元の情報記録体との明確な差は確認出来ず、改竄跡がわかりにくかった。

As shown in Table 1, the information recording medium of the present invention of Example 1 was not peeled at all as a result of the peeling test, and the information recording body falsified using the information recording body of the present invention of Example 1 was At first glance, it looked the same as the original information recording body, but when observed with a microscope, the disappearance or destruction of the heat-foamed particles was confirmed, and the falsified mark could be clearly identified. On the other hand, as a result of the peel test, the information recording medium for comparison in Example 3 had partial peeling between the image receiving layer / adhesive layer and the easy-adhesive layer. The information recording body falsified using the information recording body of No. 1 could not confirm a clear difference from the original information recording body, and it was difficult to understand the falsification trace.

  Further, as shown in Table 2, the information recording material of the present invention of Example 2 was not damaged at all as a result of the friction test. On the other hand, as a result of the friction test, the comparative information recording medium of Example 4 was broken in a part of the release layer, the intermediate layer, and the image receiving layer / adhesive layer.

(A) is an enlarged side sectional view showing an embodiment of the information recording body of the present invention, and (b) is an enlarged side sectional view showing another embodiment of the information recording body. (A) is an expanded side sectional view showing an embodiment of a transfer medium used for the information recording body of the present invention, and (b) is an enlargement showing another embodiment of the transfer medium used for the information recording body. It is a sectional side view. FIG. 3 is a side sectional view showing an embodiment of an intermediate transfer medium used for the information recording medium of the present invention. (A)-(c) is explanatory drawing which shows one Embodiment of the manufacturing method of the information recording body of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 ... Information recording body 10, 10 '... Transfer medium 11 ... Base material layer 12, 13, 14, 15 ... Easy-adhesion layer 16 ... Thermoplastic resin 17 ... Thermally foamable particle 18 ... Phosphor 19 ... Heating foaming Finished particles 20 ... intermediate transfer medium 21 ... support base layer 22 ... peeling layer 23 ... intermediate layer 24 ... image receiving layer / adhesive layer T ... heat P ... stress

Claims (10)

  At least one release layer on one side of the supporting base material layer, and an image receiving layer / adhesive layer on which information is recorded in the above order, from the release layer of the intermediate transfer medium to the image receiving layer / adhesive layer, thermoplastic on one side of the base material layer An information recording body obtained by heating and transferring to an easy-adhesion layer surface of a transfer medium formed by laminating an easy-adhesion layer comprising a resin and heat-expandable particles, wherein the heat-expandable particles are foamed. Either foamed particles are colorless particles, colored particles, particles that are excited by ultraviolet light and emit light in the visible wavelength region, or particles that are excited by infrared light or visible light and emit light in the infrared wavelength region or visible wavelength region An information recording body characterized by being one or more kinds.   2. The information recording body according to claim 1, wherein a phosphor is contained in the easy-adhesion layer of the transfer medium.   The information recording body according to claim 2, wherein the phosphor has an average particle diameter of 1 to 10 μm.   The information recording body according to any one of claims 1 to 3, wherein an average particle diameter of the thermally foamable particles is 10 µm or less when unexpanded.   An OVD (Optical Variable Device) layer in which a diffraction grating structure is formed is provided between the release layer of the information recording body according to any one of claims 1 to 4 and the image receiving layer / adhesion layer. Characteristic information recording medium.   An information recording body according to any one of claims 1 to 5, further comprising an embossed pattern.   The information recording body according to any one of claims 1 to 6, wherein the thermally foamable particles in the easy-adhesion layer of the transfer medium are foamed at a temperature lower than the heat transfer temperature.   At least the release layer on one side of the supporting base material layer, the image receiving layer / adhesive layer side of the intermediate transfer medium having the image receiving layer / adhesive layer in which information is recorded in the above order, the thermoplastic resin on one side of the base material layer, Heat-expandable particles in the easy-adhesion layer of the medium to be transferred by superimposing them on the surface of the easy-adhesion layer of the transfer medium formed by laminating an easily-adhesive layer comprising heat-expandable particles and heating and pressing from the intermediate transfer medium side A method for producing an information recording body, wherein the support base material layer is peeled off in a state where particles are heated and foamed particles are generated.   9. The method for manufacturing an information recording body according to claim 8, wherein the easily adhesive layer of the transfer medium contains a phosphor.   The method for producing an information recording body according to claim 8 or 9, wherein the surface is heated and pressurized with a heating roll having irregularities on the surface.

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