Laminated body

Abstract

To provide a laminated body which can improve the drawing density and inhibit occurrence of delamination.SOLUTION: In a laminated body of the present invention, a laser drawing layer 3 and a protection layer 5 are layered on one surface of a core layer 2 holding an IC chip 1. The laser drawing layer 3 and the protection layer 5 are formed as laser coloring sheets each of which displays a color by radiation of a laser beam, and a printing surface formation layer 4 forming a printing surface is layered between the laser drawing layer 3 and the protection layer 5. The printing surface formation layer 4 is formed as a laser coloring sheet.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a laminate in which a plastic substrate or a thermoplastic resin sheet is laminated.

Background Art

[0002] Currently, various types of cards are used in daily life. For example, cards with specific information or the like printed on the surface of a plastic substrate, magnetic cards such as telephone cards, or credit cards incorporating an IC chip, IC cards typified by my number cards, and passports using a data page with personal information or the like printed on a plastic substrate, and some are printed with images such as face photos for uses such as identity verification.

[0003] For such various cards, there is a technique of forming specific information or the like on the surface of a plastic substrate or a thermoplastic resin sheet by printing, forming personal information or the like as a laser-colored image on a laser-colored sheet laminated thereon, and preventing forgery of the printed specific information.

[0004] For example, the applicant has already disclosed a laminate having a base material layer (thermoplastic resin sheet), a laser coloring layer formed of a laser coloring sheet that colors with a predetermined laser beam, a transparent layer laminated on at least one surface of the laser coloring layer, and a printing layer between the upper layer of the transparent layer and the transparent layer and the laser coloring layer (Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in Patent Document 1, when information is printed by irradiating a laminate with a laser beam, when a transparent layer exists above the laser color-developing layer, the drawing density becomes light and difficult to visually recognize, and when the laser beam is irradiated onto the laser color-developing layer, bubbles associated with delamination called delamination may occur at the irradiated locations due to the energy.

[0007] When such delamination occurs, there is a problem that the quality of the laser printing deteriorates, becoming unclear.

[0008] An object of the present invention is to provide a laminate that can increase the drawing density and suppress the occurrence of delamination.

Means for Solving the Problems

[0009] The laminate of the present invention according to claim 1 is a laminate in which a laser drawing layer 3 and a protective layer 5 are laminated on one surface of a core layer 2 that holds an IC chip 1, and the laser drawing layer 3 and the protective layer 5 are laser color-developing sheets that develop color by irradiation with a laser beam.

[0010] The present invention according to claim 2 is the laminate according to claim 1, wherein a printing surface forming layer 4 that forms a printing surface is laminated between the laser drawing layer 3 and the protective layer 5, and the printing surface forming layer 4 is a laser color-developing sheet.

[0011] The present invention according to claim 3 is the laminate according to claim 2, wherein the laser drawing layer 3, the printing surface forming layer 4, and the protective layer 5 laminated on the one surface of the core layer 2 are also laminated on the other surface of the core layer 2.

Effects of the Invention

[0012] According to the laminate of the present invention, not only the laser drawing layer 3 but also the protective layer 5 is a laser color-developing sheet. As a result, color development by laser light also occurs in the protective layer 5, so that the drawing density increases. Also, by laminating the laser drawing layer 3 and the protective layer 5, which are the same laser color-developing sheet, the occurrence of delamination can be suppressed, the quality is improved, and clear drawing by laser light can be performed.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0014] The laminate according to the first embodiment of the present invention has a laser drawing layer 3 and a protective layer 5 as laser color-developing sheets. According to this embodiment, not only the laser drawing layer 3 but also the protective layer 5 is a laser color-developing layer, so that color development by laser light also occurs in the protective layer 5, so that the drawing density increases. Also, by laminating the laser drawing layer 3 and the protective layer 5 formed of the same laser color-developing sheet, the occurrence of delamination can be suppressed, the quality is improved, and clear drawing by laser light can be performed.

[0015] The second embodiment of the present invention is the laminate in the first embodiment, in which a printing surface forming layer 4 for forming a printing surface is laminated between the laser drawing layer 3 and the protective layer 5, and the printing surface forming layer 4 is a laser color-developing layer. According to this embodiment, not only the laser drawing layer 3 and the protective layer 5 but also the printing surface forming layer 4 is a laser color-developing sheet, so that color development by laser light also occurs in the printing surface forming layer 4, so that the drawing density increases. Also, by laminating the laser drawing layer 3, the protective layer 5, and the printing surface forming layer 4, which are the same laser color-developing sheets, the occurrence of delamination can be suppressed, the quality is improved, and clear drawing by laser light can be performed.

[0016] The third embodiment of the present invention is a laminate in the second embodiment, in which a laser drawing layer 3, a printing surface forming layer 4, and a protective layer 5 laminated on one surface of the core layer 2 are also laminated on the other surface of the core layer 2. According to this embodiment, by making the lamination forms on one surface and the other surface of the core layer 2 the same, the shrinkage rates during thermocompression bonding become the same on one surface and the other surface, so that distortion and the like are suppressed, and the quality of the laminate is stabilized.

Example

[0017] The laminate according to the present invention will be described. FIG. 1 is a conceptual diagram showing a laminate according to an embodiment of the present invention. FIG. 1(a) is a conceptual diagram showing each layer forming the laminate of this embodiment, and FIG. 1(b) is a conceptual diagram showing the laminated state.

[0018] The laminate of this embodiment is laminated with a laser drawing layer 3 drawn by laser light, a printing surface forming layer 4 forming a printing surface, and a protective layer 5 protecting the printing surface forming layer 4 on one surface of a core layer 2 that holds an IC chip 1, and is used, for example, as a passport or a card such as an identity certificate or a cash card.

[0019] Also, an optical change element 6 such as a hologram may be disposed between the laser drawing layer 3 and the printing surface forming layer 4. By disposing the optical change element 6, the forgery prevention effect of the laminate is improved.

[0020] Note that it is preferable that a laser drawing layer 3 drawn by laser light, a printing surface forming layer 4 forming a printing surface, and a protective layer 5 protecting the printing surface forming layer 4 are also laminated on the other surface of the core layer 2.

[0021] In this way, by laminating the laser drawing layer 3, the printing surface forming layer 4, and the protective layer 5 laminated on one surface of the core layer 2 also on the other surface of the core layer 2 and making the lamination forms on both surfaces of the core layer 2 the same, the shrinkage rates during thermocompression bonding become the same on one surface and the other surface, so that the quality of the laminate is stabilized.

[0022] The core layer 2 is composed of a single layer or multiple thermoplastic resin sheets. For example, polycarbonate (PC), polyethylene terephthalate glycol (PETG), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer resin (ABS resin) can be used. The core layer 2 may be made of a single material or a combination of different materials. The core layer 2 is preferably composed of a plurality of sheets laminated to hold the IC chip 1.

[0023] The laser drawing layer 3, the printing surface forming layer 4, and the protective layer 5 are formed by a laser coloring sheet made of a transparent resin that colors black or reddish-brown by an IR laser or a UV laser. As long as it has transparency, it is not particularly limited and is composed of a single layer or multiple thermoplastic resin sheets laminated. For the material of the thermoplastic resin sheet, polycarbonate (PC), polyethylene terephthalate glycol (PETG), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer resin (ABS resin) can be used. As the plurality of thermoplastic resin sheets, a single material or a combination of different materials may be used, and each thermoplastic resin sheet may be made of a material in which a plurality of materials are mixed.

[0024] The laminate of this embodiment uses at least the laser drawing layer 3 and the protective layer 5 as the laser coloring sheet.

[0025] In this way, by using not only the laser drawing layer 3 but also the protective layer 5 as the laser coloring sheet, coloring by laser light also occurs in the protective layer 5, so the drawing density increases.

[0026] In addition, when the irradiated laser colors in the protective layer 5, the energy decays, and the energy applied to the laser drawing layer 3 becomes lower compared to the prior art. Therefore, the occurrence of delamination can be suppressed, the quality is improved, and clear drawing by laser light can be performed.

[0027] In addition, for the printing surface forming layer 4 laminated between the laser drawing layer 3 and the protective layer 5 in this embodiment, it is also preferable to use a laser color developing sheet.

[0028] In this way, not only the laser drawing layer 3 and the protective layer 5, but also the printing surface forming layer 4 is a laser color developing sheet, so that color development by laser light also occurs in the printing surface forming layer 4, resulting in a higher drawing density. Also, by laminating the laser drawing layer 3, the protective layer 5, and the printing surface forming layer 4, which are the same laser color developing sheets, the occurrence of delamination can be further suppressed, and clear drawing by laser light can be performed due to the improvement in quality.

[0029] As described above, by making all the layers laminated on the core layer 2 into laser color developing sheets, color development by laser light occurs in all the layers, resulting in a high drawing density, and the occurrence of delamination can be suppressed, and clear drawing by laser light can be performed.

[0030] In consideration of the shrinkage rate during thermocompression bonding, it is preferable that the laser drawing layer 3, the printing surface forming layer 4, and the protective layer 5 are formed of exactly the same laser color developing sheet. However, if the color development performance with respect to the same laser light is the same, some of them may contain different materials.

[0031] FIG. 2 is a diagram showing laser drawing on the laminate of the present invention and a conventional laminate. FIG. 2(a) is a conventional laminate in which the laser drawing layer 3 is a laser color developing sheet, and the printing surface forming layer 4 and the protective layer 5 are thermoplastic resin sheets that do not develop color by laser. FIG. 2(b) is a conventional laminate in which the laser drawing layer 3 and the printing surface forming layer 4 are laser color developing sheets, and the protective layer 5 is a thermoplastic resin sheet that does not develop color by laser. FIG. 2(c) is the laminate of the present invention in which the laser drawing layer, the printing surface forming layer, and the protective layer 5 are all laser color developing sheets.

[0032] When laser drawing was performed on the conventional laminate shown in FIG. 2(a), the laser drawing layer 3 developed color, but the printing surface forming layer 4 and the protective layer 5 did not develop color.

[0033] When laser drawing was performed on the conventional laminate shown in Fig. 2(b), the laser drawing layer 3 and the printing surface forming layer 4 were laser-colored, but the protective layer 5 was not colored.

[0034] When laser drawing was performed on the laminate of the present invention shown in Fig. 2(c), all of the laser drawing layer 3, the printing surface forming layer 4, and the protective layer 5 were colored.

Explanation of Reference Numerals

[0035] 1 IC chip 2 Core layer 3 Laser drawing layer 4 Printing surface forming layer 5 Protective layer 6 Optical change element

Claims

1. A laminate in which a laser drawing layer and a protective layer are laminated on one surface of a core layer that holds an IC chip, wherein the laser drawing layer and the protective layer are a laser color-developing sheet that develops color by irradiation with laser light. The laminate is characterized by this.

2. A printing surface forming layer that forms a printing surface is laminated between the laser drawing layer and the protective layer, and the printing surface forming layer is the laser color-developing sheet. The laminate according to claim 1, characterized by this.

3. The laser drawing layer, the printing surface forming layer, and the protective layer laminated on the one surface of the core layer are also laminated on the other surface of the core layer. The laminate according to claim 2, characterized by this.

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