JP2019171778A - Information recording medium and method of manufacturing the same - Google Patents

Abstract

To provide an information recording medium excellent in durability and having high security, and a method of manufacturing the same.SOLUTION: There is provided an information recording medium 11 provided with a heat sensitive color developing layer 13 in a predetermined position on a core member 12A of the core member 12A and a transparent resin substrate 12B that configure an opaque resin substrate, the heat sensitive color developing layer 13 including a developer that has an electron donor property, a dye that reacts with the developer and discolors from achromatic color to color, and a binder resin that holds adherence with the core member 12A to form secret information 21, and provided with a concealing part 22 located on the heat sensitive color developing layer 13 that covers at least the secret information 21, releasable with respect to the heat sensitive color developing layer 13, configured with a transparent resin layer 14 including a color developing material that absorbs laser beam and develops color, thereby exhibiting a color developing state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an information recording medium on which secret information is recorded and concealed, and a manufacturing method thereof.

  In recent years, there are various types of secret information that are concealed by a concealing member and the concealing member is peeled off so that the secret information can be visually recognized. For example, by keeping secret information such as an authentication number concealed with a concealment label on a prepaid card, a person who purchased the prepaid card peels off the concealment label and declares secret information such as a number. It is widespread as being able to receive services. Since such cards and the like are distributed, high durability is desired, and high security is required to prevent unauthorized viewing.

  Conventionally, for example, a scratch card described in Patent Document 1 is known as a card that holds secret information. In Patent Document 1, a receiving layer having an ink jet printing portion is formed on a card base material via an anchor agent, a concealable concealing layer is laminated on the receptive layer, and a protective layer is appropriately formed on the concealing layer. The formed receiving layer contains a microcapsule encapsulating an electron donating color former and an electron accepting developer.

  In such a scratch card, the microcapsule is destroyed by pressurization, and the electron-donating color developer and the electron-accepting developer react to develop color, and the cover layer is scraped to illegally steal print information. In this case, the microcapsules contained in the accepting layer are destroyed by the pressure at the time of scraping, and the electron donating color former and the electron accepting developer react to develop color, making it possible to prevent unauthorized use. Yes.

JP 2013-022853 A

  However, in Patent Document 1, in the concealment of the print information formed on the receiving layer, even when pressure is applied to the receiving layer unintentionally at the manufacturing stage or the transportation stage, the receiving layer is colored and discriminated from unauthorized use. In particular, if the concealing layer is not destroyed, there is a problem that the appearance cannot be determined because it looks like a formal product.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide an information recording medium having excellent durability and high security, and a method for manufacturing the same.

  In order to solve the above-mentioned problems, the invention of claim 1 is an information recording medium in which secret information is concealed and the secret information is exposed later, an opaque resin substrate, and a predetermined information on the resin substrate. The position contains a developer having an electron donating property, a dye that changes color from colorless to colored by reacting with the developer, and a binder resin that maintains adhesion to the resin substrate, and stores the secret information. A transparent material containing a color forming material which is formed on the heat sensitive color forming layer which is formed and which is positioned on the heat sensitive color developing layer covering at least the secret information and is detachable from the heat sensitive color developing layer and which absorbs laser light and develops color. And a concealing portion formed of a resin layer and colored.

In the inventions of claims 2 and 3, “the melting point of the developer contained in the thermosensitive coloring layer in which the secret information is recorded is higher than the melting point of the resin contained in the resin substrate and the transparent resin layer”. With configuration,
“The thermosensitive coloring layer contains a photothermal conversion material that absorbs laser light and converts it into heat, and the secret information is formed by laser light”.

  In the invention of claim 4, at a predetermined position on the resin substrate, a developer having an electron donating property, a dye that changes color from colorless to colored by reacting with the developer, and adhesion to the resin substrate A heat-sensitive color forming layer containing a binder resin that retains the color, and is located at least on the heat-sensitive color developing layer and is detachable from the heat-sensitive color developing layer, and contains a color developing material that absorbs laser light and develops color. A method for manufacturing an information recording medium in which secret information is recorded on an information recording sheet on which a transparent resin layer is formed, wherein the secret information is formed by applying thermal stimulation to the thermosensitive coloring layer. And a step of forming a concealing portion by irradiating the detachable portion of the transparent resin layer at a position covering at least the secret information with a laser beam to cause color development.

In the inventions of claims 5 and 6, "the melting point of the developer is higher than the melting point of the resin contained in the resin base material and the transparent resin layer",
“The thermosensitive coloring layer contains a photothermal conversion material that absorbs laser light and converts it into heat”.

  According to the invention of claim 1, at a predetermined position on an opaque resin substrate, a developer having electron donating property, a dye that reacts with the developer and changes color from colorless to colored, and the resin substrate A heat-sensitive color forming layer containing a binder resin that retains adhesiveness to form secret information is provided, and is positioned on the heat-sensitive color developing layer that covers at least the secret information and is detachable from the heat sensitive color developing layer. Yes, it is made up of a transparent resin layer that contains a coloring material that absorbs laser light and develops color, and a concealing portion in the colored state is provided, so that unnecessary pressure is applied to the thermosensitive coloring layer at the manufacturing and transportation stages. Even if it is added, it can improve the durability without affecting the confidential information, and the confidential information cannot be observed unless the concealing part is peeled off, and the security can be improved. With things That.

  According to the inventions of claims 2 and 5, by setting the melting point of the developer higher than the melting point of the resin contained in the resin base material and the transparent resin layer, the heat-sensitive coloring layer of the transparent resin layer is fused. The developer is not melted and the secret information can be clearly formed.

  According to the third and sixth aspects of the present invention, the photothermal conversion material efficiently converts the laser light into heat by including the photothermal conversion material that absorbs the laser light and converts it into heat in the thermosensitive coloring layer. Therefore, since the secret information is formed with a low laser output, the load on the medium can be reduced.

  According to the invention of claim 4, at a predetermined position on the resin substrate, a developer having an electron donating property, a dye that changes color from colorless to colored by reacting with the developer, and the resin substrate A coloring material that forms a heat-sensitive coloring layer containing a binder resin that retains adhesion, is positioned at least on the heat-sensitive coloring layer and is detachable from the heat-sensitive coloring layer, and absorbs laser light to form a color. The information recording sheet on which the transparent resin layer containing is formed is subjected to thermal stimulation to the thermosensitive coloring layer to form secret information, and at least a portion of the transparent resin layer that covers the secret information can be peeled off. By forming a concealing part by irradiating the laser beam with the laser beam, it is possible to form clear secret information by suppressing the color development when the transparent resin layer is fused to the thermosensitive coloring layer. Can be concealed The formation in which it is possible to easily form a desired position.

It is a block diagram of the information recording medium based on this invention. FIG. 2 is a manufacturing process diagram of the information recording sheet of FIG. 1. It is a manufacturing process figure of 1st Embodiment which forms secret information and a concealment part on the sheet | seat of FIG. It is a manufacturing-process figure of 2nd Embodiment which forms secret information and a concealment part on a sheet | seat provided with the thermosensitive coloring layer containing a photothermal conversion material. It is another block diagram of the information recording medium based on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that dimensions and the like are ignored in the cross-sectional view shown in the figure for easy understanding.

  FIG. 1 shows a configuration diagram of an information recording medium according to the present invention. 1 (A) and 1 (B), the information recording medium 11 has a thermosensitive coloring layer 13 at a predetermined position on the core member 12A in an opaque resin base composed of a core member 12A and a transparent resin base 12B. A transparent resin layer 14 is provided on the surface of the resin substrate 12 on which the heat-sensitive color forming layer 13 is provided. Secret information 21 is formed on the heat-sensitive color developing layer 13 and a transparent resin layer is provided. 14, a concealing part 22 is formed at a position covering at least the secret information 21. In the present embodiment, the transparent resin layer 14 is formed on the entire core member 12A including the thermosensitive coloring layer 13, but is formed only in a region corresponding to the thermosensitive coloring layer 13 (secret information 21). Also good.

  The concealing part 22 is detachable from the thermosensitive coloring layer 13 on which the secret information 21 is formed, and at least a three-side half-cut part 15 for separating the region corresponding to the secret information 21 from the transparent resin layer 14. Is formed.

  For example, polyvinyl chloride (PVC), polyethylene terephthalate glycol (PET-G), polycarbonate (PC), or the like is used as the core member 12A constituting the resin base material. Specifically, Taihei Chemical using PET-G PG700M manufactured by Product Co., Ltd. is used.

  As the transparent resin substrate 12B constituting the resin substrate, for example, polyvinyl chloride (PVC), polyethylene terephthalate glycol (PET-G), polycarbonate (PC), or the like is used. Specifically, PET-G is used. CG030M manufactured by Taihei Chemicals Co., Ltd. is used. The transparent resin substrate 12B is provided with a thickness of, for example, 50 μm or more (for example, 50 μm to 100 μm). The core member 12A and the transparent resin substrate 12B are preferably the same type.

  In the present embodiment, an opaque resin substrate is formed by the core member 12A and the transparent resin substrate 12B. However, if a colored and opaque resin layer is applied instead of the transparent resin substrate 12B, a single layer is formed. You can also.

  The thermosensitive coloring layer 13 in which the secret information 21 is formed is a color change from colorless to colored by reacting with the developer which is an electron acceptor (electron donating property) having a melting point equal to or higher than the resin fusion temperature. And a binder resin that maintains the adhesion between the core member 12A.

  The developer has a melting point higher than that of the resin contained in the core member 12A and the transparent resin layer 14, and is used in combination with a dye (leuco pigment described later). For example, it has a component of a phenol derivative such as bisphenol S, and specifically, BPS / FF-1 manufactured by Nikka Chemical Co., Ltd. using bisphenol S having a melting point of 250 ° C. is used. For example, a known leuco dye is used as the dye. The leuco dye is selected from, for example, a phthalide compound, an azaphthalide compound, a fluorane compound, and the like according to the hue to be colored.

  The binder resin has a glass transition point within 30 ° C. on the low temperature side compared to the melting point of the resin contained in the transparent resin substrate 12B and the transparent resin layer 14, and is transparent and translucent. It has inert properties and has sufficient strength after drying. Examples thereof include polyvinyl alcohol (PVA), urethane, styrene, and acrylic. Specifically, the glass transition point Tg. Is an acrylic resin having a temperature of 130 ° C. or lower (preferably 100 ° C.).

  The transparent resin layer 14 contains, for example, a coloring material that develops color by absorbing laser light into PVC, PET-G, and PC, which are base resins. Examples of the coloring material include indium tin oxide (ITO), A titanium oxide compound is mentioned, Specifically, Taihei Chemical Products Co., Ltd. CG033ML-X using PET-G is used. Since the transparent resin layer 14 is formed on the entire surface of the core member 12A including the thermosensitive coloring layer 13 in the drawing, the same type as the core member 12A is preferable. That is, the concealing portion 22 is configured to make the secret information 21 invisible in a state where the transparent resin layer 14 absorbs laser light and develops the coloring material.

  In the information recording medium 11 as described above, the secret information 21 can be visually observed by separating the concealing portion 22 by the half-cut portion 15 and separating it from the thermosensitive coloring layer 13 as shown in FIG. It is something to be expressed. In addition, it is good also as forming the cut part for isolate | separating into the corner part of the half cut part 15. FIG.

  Such an information recording medium 11 may affect the secret information 21 because the thermosensitive coloring layer 13 does not develop color even when an unnecessary pressure is applied to the thermosensitive coloring layer 13 in the manufacturing or transportation stage. As long as the concealing part 22 is separated and peeled off, the secret information 21 cannot be observed unless the concealing part 22 is separated and the heat-sensitive coloring layer 13 once separated is returned to its original state. Therefore, unauthorized viewing can be prevented and security can be improved.

  FIG. 2 shows a manufacturing process diagram of the information recording sheet of FIG. 1, and FIG. 3 shows a manufacturing process diagram of the first embodiment in which secret information and a concealing portion are formed on the sheet of FIG. As the manufacture of the information recording sheet 11A for forming the secret information 21 and the concealing portion 22 on the information recording medium 11, the above-mentioned thermosensitive coloring layer 13 is formed at a predetermined position on the above-mentioned resin substrate 12 shown in FIG. Is formed by coating.

  Subsequently, as shown in FIG. 2B, the transparent resin layer 14 is bonded and fused by thermal lamination on the entire surface of the core member 12A on which the heat-sensitive color forming layer 13 is formed. The transparent resin base material 12B is fused to the other surface side of the member 12A to form the information recording sheet 11A. The laminating temperature in the thermal lamination is contained in at least the core member 12A and the transparent resin layer 14. It is carried out above the melting point of the resin.

  That is, the thermosensitive coloring layer 13 has a glass transition point of the binder resin within 30 ° C. on the low temperature side compared to the melting point of the resin contained in the core member 12A and the transparent resin layer 14, thereby laminating the binder resin. It is possible to suppress the flow of the color, thereby inhibiting the reaction between the dye and the developer and suppressing the color development. For example, by setting the melting point of the developer to 250 ° C. and the melting point Tg of the binder resin to 100 ° C. and laminating at 130 ° C., the coloring can be suppressed by the dye and the developer and the secret information 21 can be clearly formed. In addition, the transparent resin layer 14 can be peeled from the thermosensitive coloring layer 13.

  In addition, by making the melting point of the developer higher than the melting point of the resin contained in the core member 12A (transparent resin base material 12B) and the transparent resin layer 14, the developer does not melt at the time of lamination, and color development occurs. Furthermore, the secret information 21 can be clearly formed by being suppressed.

  And the half cut part 15 is formed in three sides of the position corresponding to the area | region of the thermosensitive coloring layer 13 (secret information 21) in the transparent resin layer 14, for example with a laser beam (you may die-cut).

  Therefore, as shown in FIG. 3A, a thermal stimulus 31A corresponding to the secret information 21 is applied from the transparent resin layer 14 side to the thermosensitive coloring layer 13 by a coloring heat source 31 such as a thermal head. As shown in FIG. 3 (B), the thermosensitive coloring layer 13 is changed from colorless to colored to develop the color, thereby forming the secret information 21.

  Subsequently, as shown in FIG. 3C, by irradiating a laser beam 32 to a position corresponding to the region of the thermosensitive coloring layer 13 (secret information 21) in the transparent resin layer 14, the contained coloring material is made colorless. A concealing portion 22 that covers the secret information 21 and is invisible is formed by changing the color to color.

  As described above, since the coloring at the time of fusion of the transparent resin layer 14 is suppressed with respect to the thermosensitive coloring layer 13, clear secret information 21 can be formed, and the formation of the concealing portion 22 can be performed at a desired position. It can be easily formed.

  Next, FIG. 4 shows a manufacturing process diagram of a second embodiment in which secret information and a concealing part are formed on a sheet provided with a thermosensitive coloring layer containing a photothermal conversion material. The information recording medium 11 shown in FIG. 4 includes a heat-sensitive color developing layer 13 containing a photothermal conversion material that absorbs laser light and converts it into heat. Other configurations are the same as those shown in FIGS. It is the same. Examples of photothermal conversion materials include indium tin oxide (ITO), tungsten oxide compounds, and hexaboride. Specifically, CWO (registered trademark) using cesium tungsten oxide manufactured by Sumitomo Metal Mining Co., Ltd. is used. Is done.

  Therefore, in FIG. 4A, the laser beam 32 is irradiated (scanned) to the thermosensitive coloring layer 13 of the information recording sheet 11A shown in FIG. By efficiently converting to heat, the secret information 21 can be recorded with a low laser output. As a result, the load on the transparent resin layer 14 and the thermosensitive coloring layer 13 can be reduced.

  Subsequently, as shown in FIG. 4B, the laser beam 32 is irradiated (scanned) to a position including the half-cut portion 15 corresponding to the region of the thermosensitive coloring layer 13 (secret information 21) of the transparent resin layer 14. As a result, the contained color forming material develops a black color, and the contained resin is carbonized to become black, thereby forming the concealing portion 22 by the laser light 32, whereby the information recording medium 11 shown in FIG. It is something to be made.

  The formation of the secret information 21 by the laser beam 32 on the thermosensitive coloring layer 13 shown in FIG. 4A and the formation of the concealing portion 22 by the laser beam 32 on the transparent resin layer 14 can be performed in the same process. .

  Next, FIG. 5 shows another configuration diagram of the information recording medium according to the present invention. In the information recording medium 11 shown in FIGS. 5A and 5B, the secret information 21 is formed on the thermosensitive coloring layer 13, and the secret information 21 (the thermosensitive coloring layer 13) on the transparent resin layer 14 is formed. Forming the concealing portion 22 at the corresponding position is the same as described above, and is a form in which display information 23 such as characters and figures is formed in an area other than the concealing portion 22 of the transparent resin layer 14.

  That is, since the transparent resin layer 14 contains a coloring material, the display information 23 can be formed by irradiating the laser beam 32, and the display information 23 is formed in the same process as the formation of the concealing portion 22. It can be made to.

  The information recording medium and the manufacturing method thereof according to the present invention can be used in industries such as manufacturing, sales, and use of labels and prepaid cards.

DESCRIPTION OF SYMBOLS 11 Information recording medium 11A Information recording sheet 12A Core member 12B Transparent resin base material 13 Thermosensitive coloring layer 14 Transparent resin layer 15 Half cut part 21 Secret information 22 Concealing part 23 Display information 31 Coloring heat source 31A Thermal stimulation 32 Laser light

Claims (6)

An information recording medium in which secret information is concealed and the secret information is displayed later,
An opaque resin substrate;
At a predetermined position on the resin substrate, a developer having an electron donating property, a dye that changes color from colorless to colored by reacting with the developer, and a binder resin that maintains adhesion with the resin substrate A thermosensitive coloring layer that is contained to form the secret information;
It is located on the thermosensitive coloring layer covering at least the secret information and is detachable from the thermosensitive coloring layer, and is composed of a transparent resin layer containing a coloring material that absorbs laser light and develops color. A concealment unit;
An information recording medium comprising:   2. The information recording medium according to claim 1, wherein a melting point of the developer contained in the thermosensitive coloring layer on which the secret information is recorded is higher than a melting point of the resin contained in the resin base material and the transparent resin layer. An information recording medium characterized by being expensive.   3. The information recording medium according to claim 1, wherein the thermosensitive coloring layer contains a photothermal conversion material that absorbs laser light and converts it into heat, and the secret information is formed by laser light. A characteristic information recording medium. Contains a developer having an electron donating property at a predetermined position on the resin substrate, a dye that changes color from colorless to colored by reacting with the developer, and a binder resin that maintains adhesion to the resin substrate. And a transparent resin layer containing a coloring material that absorbs laser light and develops color is formed at least on the thermal coloring layer and is peelable from the thermal coloring layer. A method for manufacturing an information recording medium in which confidential information is recorded on a sheet for recording information,
Providing the thermal information to the thermosensitive coloring layer to form the secret information;
Forming a concealing part by irradiating the detachable part at a position covering at least the secret information of the transparent resin layer with a laser beam to develop a color; and
A method for producing an information recording medium, comprising:   5. The information recording medium manufacturing method according to claim 4, wherein the developer has a melting point higher than that of the resin contained in the resin base material and the transparent resin layer. Production method.   6. The method of manufacturing an information recording medium according to claim 4, wherein the heat-sensitive color developing layer contains a photothermal conversion material that absorbs laser light and converts it into heat. .

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