JP7019485B2 - Information recording medium and its manufacturing method - Google Patents

Description

The present invention relates to an information recording medium in which confidential information is recorded and concealed, and a method for manufacturing the same.

In recent years, there are various types in which confidential information is concealed by a concealing member and the confidential information is made visible by peeling off the concealing member. For example, the prepaid card is kept secret information such as the authentication number in a concealed state with a concealed label, and the person who purchased the prepaid card peels off the concealed label and declares the confidential information such as the number. It is popular as a service that can be received. Since such cards and the like are distributed, high durability is desired, and high security is desired to prevent fraudulent recognition.

Conventionally, as a card for holding confidential information, for example, a scratch card described in Patent Document 1 is known. In Patent Document 1, a receiving layer having an inkjet printing portion is formed on a card substrate via an anchoring agent, a scratchable concealing layer is laminated on the receiving layer, and a protective layer is appropriately provided on the concealing layer. The formed receiving layer contains microcapsules containing an electron-donating color-developing agent and an electron-accepting coloring agent.

In such scratch cards, the microcapsules are destroyed by pressurization, and the electron-donating color-developing agent and the electron-accepting coloring agent react to develop color. In this case, the microcapsules contained in the receptive layer are destroyed by the pressure of scraping, and the electron-donating color-developing agent and the electron-accepting color-developing agent react to develop color, making it possible to prevent unauthorized use. There is.

Japanese Unexamined Patent Publication No. 2013-022853

However, in the above-mentioned Patent Document 1, in the hiding of the printed information formed on the receiving layer, even when the pressure is unknowingly applied to the receiving layer in the manufacturing stage or the transporting stage, the receiving layer develops color and is determined to be illegally used. However, if the concealing layer is not destroyed, there is a problem that the defect cannot be determined because it looks like a formal product in appearance.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention 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 problems, the invention of claim 1 is an information recording medium in which confidential information is concealed and the confidential information is later expressed, and is an opaque resin base material and a predetermined shape on the resin base material. The secret information is contained at the position of a developer having an electron acceptor, 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. A transparent layer containing a color-developing material that is located on the heat-sensitive color-developing layer that is formed and at least on the heat-sensitive color-developing layer that covers the secret information, is removable from the heat-sensitive color-developing layer, and absorbs laser light to develop color. It is configured to have a concealing portion in a color-developed state, which is composed of a resin layer.

In the inventions of claims 2 and 3, "the melting point of the color developer contained in the heat-sensitive color-developing layer in which the confidential information is recorded is higher than the melting point of the resin contained in the resin base material and the transparent resin layer". As a composition,
"The heat-sensitive color-developing layer contains a photothermal conversion material that absorbs laser light and converts it into heat, and the secret information is formed by the laser light."

In the invention of claim 4, a developer having an electron acceptor at a predetermined position on the resin substrate, a dye that changes color from colorless to colored by reacting with the developer, and adhesion to the resin substrate. A heat-sensitive color-developing layer containing a binder resin is formed, and at least it is located on the heat-sensitive color-developing layer and can be peeled off from the heat-sensitive color-developing layer. This is a method for manufacturing an information recording medium in which confidential information is recorded on an information recording sheet on which a transparent resin layer is formed, and a thermal stimulus is applied to the heat-sensitive color-developing layer to form the confidential information. The configuration includes a step of irradiating the peelable portion of the transparent resin layer at least at a position covering the confidential information with a laser beam to develop a color to form a concealed portion.

The inventions of claims 5 and 6 have a configuration in which "the melting point of the color developer is higher than the melting point of the resin contained in the resin base material and the transparent resin layer".
The configuration is such that the heat-sensitive color-developing layer contains a photothermal conversion material that absorbs laser light and converts it into heat.

According to the invention of claim 1, a color developer having an electron acceptor at a predetermined position on an opaque resin base material, a dye that changes color from colorless to colored by reacting with the color developer, and the resin base material. A heat-sensitive color-developing layer containing a binder resin that maintains adhesion to and forms a secret information is provided. There is a structure in which a transparent resin layer containing a color-developing material that absorbs laser light and develops a color is provided, and a concealing portion in a color-developed state is provided, so that unnecessary pressure is applied to the heat-sensitive color-developing layer at the manufacturing stage and the transportation stage. Even if it is added, the durability can be improved without affecting the confidential information, and the confidential information cannot be seen unless the concealed portion is peeled off, and the security can be improved. It is a thing.

According to the inventions of claims 2 and 5, the melting point of the color developer is set higher than the melting point of the resin contained in the resin base material and the transparent resin layer, so that the heat-sensitive color-developing layer is formed when the transparent resin layer is fused. The developer does not melt and can clearly form the formation of confidential information.

According to the inventions of claims 3 and 6, the photothermal conversion material efficiently converts the laser light into heat by incorporating the photothermal conversion material that absorbs the laser light and converts it into heat in the heat-sensitive color-developing layer. Therefore, since the confidential information is formed with a low laser output, the load on the medium can be reduced.

According to the invention of claim 4, a developer having an electron acceptor , a dye that changes color from colorless to colored by reacting with the developer, and the resin substrate at a predetermined position on the resin substrate. A heat-sensitive color-developing layer containing a binder resin that maintains adhesion is formed, and a color-developing material that is located at least on the heat-sensitive color-developing layer, is removable from the heat-sensitive color-developing layer, and absorbs laser light to develop color. The information recording sheet on which the transparent resin layer containing the above is formed is given a thermal stimulus to the heat-sensitive color-developing layer to form confidential information, and a peelable portion of the transparent resin layer at least at a position covering the confidential information. By irradiating the surface with a laser beam to develop a color to form a concealed portion, the heat-sensitive color-developing layer is suppressed from developing color when the transparent resin layer is fused, thereby forming clear secret information. The concealed portion can be easily formed at a desired position.

It is a block diagram of the information recording medium which concerns on this invention. It is a manufacturing process diagram of the sheet for information recording of FIG. It is a manufacturing process diagram of 1st Embodiment which forms a confidential information and a concealment part on the sheet of FIG. It is a manufacturing process diagram of the 2nd Embodiment which forms a secret information and a concealing part on a sheet provided with a heat-sensitive color-developing layer containing a photothermal conversion material. It is another block diagram of the information recording medium which concerns on this invention.

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

FIG. 1 shows a configuration diagram of an information recording medium according to the present invention. In FIGS. 1A and 1B, the information recording medium 11 has a heat-sensitive color-developing layer 13 at a predetermined position on the core member 12A of the opaque resin base material composed of the core member 12A and the transparent resin base material 12B. A transparent resin layer 14 is provided on the surface side of the resin base material 12 on which the heat-sensitive color-developing layer 13 is provided, and secret information 21 is formed on the heat-sensitive color-developing layer 13 as well as a transparent resin layer. A concealing portion 22 is formed at a position that covers at least the confidential information 21. In the present embodiment, the transparent resin layer 14 is formed on the entire core member 12A including the heat-sensitive color-developing layer 13, but it is formed only in the region corresponding to the heat-sensitive color-developing layer 13 (secret information 21). May be good.

The concealing portion 22 is peelable from the heat-sensitive color-developing layer 13 on which the secret information 21 is formed, and is a three-sided half-cut portion 15 for separating at least a region corresponding to the secret information 21 from the transparent resin layer 14. Is formed.

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

As the transparent resin base material 12B constituting the resin base material, for example, polyvinyl chloride (PVC), polyethylene terephthalate glycol (PET-G), polycarbonate (PC) and the like are used, and specifically, PET-G is used. CG030M manufactured by Taihei Chemicals Limited is used. The transparent resin base material 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 base material 12B are preferably of the same type.

In the present embodiment, the opaque resin base material is formed by the core member 12A and the transparent resin base material 12B, but if a colored and opaque resin layer is applied instead of the transparent resin base material 12B, the opaque resin base material is formed into a single layer. You can also do it.

The heat-sensitive color-developing layer 13 on which the secret information 21 is formed includes a color developer having a melting point equal to or higher than the resin fusion temperature , a dye that reacts with the color developer and changes color from colorless to colored, and a core. It is composed of a binder resin that maintains adhesion to the member 12A.

The color developer has a melting point higher than the melting point of the resin contained in the core member 12A and the transparent resin layer 14, and is used in combination with a dye (a leuco dye described later). For example, BPS / FF-1 manufactured by NICCA CHEMICAL CO., LTD., Which has a component of a phenol derivative such as bisphenol S and uses bisphenol S having a melting point of 250 ° C. is used. As the dye, for example, a known leuco dye is used. The leuco dye is selected from, for example, a phthalide compound, an azaphthalide compound, a fluorane compound, or the like, depending on the hue to be developed.

The binder resin has a glass transition point within 30 ° C. on the low temperature side as compared with the melting point of the resin contained in the transparent resin base material 12B and the transparent resin layer 14, is transparent and translucent, and reacts. It has an inert property and is considered to have sufficient strength after drying. Examples thereof include polyvinyl alcohol (PVA) -based, urethane-based, styrene-based, and acrylic-based, and specifically, glass transition point Tg. An acrylic resin having a temperature of 130 ° C. or lower (preferably 100 ° C.) is used.

The transparent resin layer 14 contains, for example, a color-developing material that absorbs laser light into a base resin such as PVC, PET-G, or PC to develop color. The color-developing material includes indium tin oxide (ITO). Examples thereof include titanium oxide compounds, and specifically, CG033ML-X manufactured by Taihei Chemicals Limited using PET-G is used. Since the transparent resin layer 14 is formed on the entire surface of the core member 12A including the heat-sensitive color-developing layer 13 in the figure, the same type as the core member 12A is preferable. That is, the concealing portion 22 makes the secret information 21 invisible in a state where the transparent resin layer 14 absorbs the laser beam to develop the color-developing material.

As shown in FIG. 1C, in the information recording medium 11 as described above, the secret information 21 can be visually recognized by separating the concealing portion 22 by the half-cut portion 15 and peeling it from the heat-sensitive color-developing layer 13. It is to be expressed in. It should be noted that a cut portion for separation may be formed in the corner portion of the half cut portion 15.

Such an information recording medium 11 may affect the secret information 21 because the heat-sensitive color-developing layer 13 does not develop color even when an unnecessary pressure is applied to the heat-sensitive color-developing layer 13 at the manufacturing stage or the transportation stage. The durability can be improved, and the secret information 21 cannot be seen unless the concealing portion 22 is separated and peeled off, and the heat-sensitive color-developing layer 13 once separated cannot be restored to its original state. It is possible to prevent fraudulent care and improve security.

Therefore, 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 the confidential information and the concealed portion are formed on the sheet of FIG. As a manufacturing 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 heat-sensitive color-developing layer 13 is located at a predetermined position on the above-mentioned resin base material 12 shown in FIG. 2 (A). Is formed by coating.

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

That is, in the heat-sensitive color-developing layer 13, the glass shift point of the binder resin is set to be within 30 ° C. on the low temperature side as compared with the melting point of the resin contained in the core member 12A and the transparent resin layer 14, so that the binder resin can be laminated. It becomes possible to suppress the flow in the above, thereby inhibiting the reaction between the dye and the color developer and suppressing the color development. For example, by setting the melting point of the color developer to 250 ° C. and the melting point Tg of the binder resin to 100 ° C. and laminating at 130 ° C., the dye and the color developer suppress the color development and clearly form the secret information 21. Also, the transparent resin layer 14 is made removable with respect to the heat-sensitive color-developing layer 13.

Further, 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 during laminating, and color development is achieved. It can be further suppressed to clearly form the confidential information 21.

Then, a half-cut portion 15 is formed on three sides of the transparent resin layer 14 at positions corresponding to the region of the heat-sensitive color-developing layer 13 (secret information 21), for example, by laser light (may be die-cut).

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

Subsequently, as shown in FIG. 3C, by irradiating the position corresponding to the region of the heat-sensitive color-developing layer 13 (secret information 21) in the transparent resin layer 14, the contained color-developing material becomes colorless. By changing to a color and developing a color, a concealing portion 22 that covers the confidential information 21 and makes it invisible is formed.

In this way, the heat-sensitive color-developing layer 13 can be made to form clear secret information 21 by suppressing the color development at the time of fusion of the transparent resin layer 14, and the concealing portion 22 can be formed at a desired position. It can be easily formed.

Next, FIG. 4 shows a manufacturing process diagram of a second embodiment in which confidential information and a concealing portion are formed on a sheet provided with a heat-sensitive color-developing layer containing a photothermal conversion material. The information recording medium 11 shown in FIG. 4 contains a photothermal conversion material that absorbs laser light and converts it into heat in a heat-sensitive color-developing layer 13, and other configurations are as shown in FIGS. 1 (A) and 1 (B). The same is true. Examples of the photothermal conversion material include indium tin oxide (ITO), a tungsten oxide compound, and a hexaboride. Specifically, CWO (registered trademark) using cesium tungsten oxide manufactured by Sumitomo Metal Mining Co., Ltd. is used. Will be done.

Therefore, in FIG. 4A, the laser light 32 is irradiated (scanned) to the heat-sensitive color-developing layer 13 of the information recording sheet 11A shown in FIG. 2C, so that the photothermal conversion material emits the laser light 32. By efficiently converting to heat, the secret information 21 can be recorded with a low laser output, and as a result, the load on the transparent resin layer 14 and the heat-sensitive color-developing 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 heat-sensitive color-developing layer 13 (secret information 21) of the transparent resin layer 14. As a result, the contained coloring material develops a black color, and the contained resin is carbonized to become black to form a concealing portion 22 by the laser beam 32, whereby the information recording medium 11 shown in FIG. 4 (C) is formed. It is something that makes you.

The heat-sensitive color-developing layer 13 shown in FIG. 4A can be formed with the secret information 21 by the laser beam 32, and the transparent resin layer 14 can be formed with the concealing portion 22 by the laser beam 32 in the same process. ..

Next, FIG. 5 shows another configuration diagram of the information recording medium according to the present invention. The information recording medium 11 shown in FIGS. 5A and 5B forms the secret information 21 on the heat-sensitive color-developing layer 13 and forms the secret information 21 (heat-sensitive color-developing layer 13) on the transparent resin layer 14. 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 a region other than the concealing portion 22 of the transparent resin layer 14.

That is, since the transparent resin layer 14 contains the 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 is something that can be made to do.

The information recording medium of the present invention and a method for manufacturing the same can be used in industries such as manufacturing, selling, and using labels, prepaid cards, and the like.

11 Information recording medium 11A Information recording sheet 12A Core member 12B Transparent resin base material 13 Heat-sensitive color-developing layer 14 Transparent resin layer 15 Half-cut part 21 Confidential information 22 Concealment part 23 Display information 31 Color-developing heat source 31A Thermal stimulation 32 Laser light

Claims (6)

It is an information recording medium in which confidential information is concealed and the confidential information is revealed later.
With an opaque resin base material,
A developer having an electron acceptor, 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 are placed at predetermined positions on the resin substrate. The heat-sensitive color-developing layer contained and forming the secret information,
It is located on the heat-sensitive color-developing layer that covers at least the confidential information, is peelable from the heat-sensitive color-developing layer, and is composed of a transparent resin layer containing a color-developing material that absorbs laser light to develop color. Concealment part and
An information recording medium characterized by having. The melting point of the color developer contained in the heat-sensitive color-developing layer in which the confidential information is recorded in the information recording medium according to claim 1 is higher than the melting point of the resin contained in the resin base material and the transparent resin layer. An information recording medium characterized by being expensive. The information recording medium according to claim 1 or 2, wherein the heat-sensitive color-developing layer contains a photothermal conversion material that absorbs laser light and converts it into heat, and the secret information is formed by the laser light. A characteristic information recording medium. A developer having an electron acceptor, 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 are contained in a predetermined position on the resin substrate. The heat-sensitive color-developing layer is formed, and a transparent resin layer containing a color-developing material that is located at least on the heat-sensitive color-developing layer, is removable from the heat-sensitive color-developing layer, and absorbs laser light to develop color is formed. It is a method of manufacturing an information recording medium in which confidential information is recorded on a sheet for recording information.
The step of applying a thermal stimulus to the heat-sensitive color-developing layer to form the secret information, and
A step of forming a concealed portion by irradiating the peelable portion of the transparent resin layer at least at a position covering the confidential information with a laser beam to develop a color.
A method for manufacturing an information recording medium, which comprises. The method for manufacturing an information recording medium according to claim 4, wherein the melting point of the color developer is higher than the melting point of the resin contained in the resin base material and the transparent resin layer. Production method. The method for manufacturing an information recording medium according to claim 4 or 5, 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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