Stacked body, card, and case

Abstract

Provided is a laminate capable of improving forgery prevention performance. The laminate includes: a substrate; an intermediate layer provided on the substrate and having a housing portion; a recording medium provided in the housing portion; and a cover layer provided on the intermediate layer. The housing portion is provided in a part of a plane of the intermediate layer, and the housing portion is a through-hole that penetrates in a thickness direction of the intermediate layer or a recessed portion that is recessed in the thickness direction of the intermediate layer. The recording medium includes a color developing layer containing: a coloring compound having electron-donating property; a color developer having electron-accepting property; and a matrix resin. The substrate, the intermediate layer, and the cover layer contain the same type of resin material. The substrate and the intermediate layer are joined to each other by fusion, and the intermediate layer and the cover layer are joined to each other by fusion.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a laminate, a card, and a case. BACKGROUND

[0002] In recent years, research has been conducted on cards such as security cards, financial settlement cards (e.g., credit cards, cash cards, and the like), identification cards (e.g., employee cards, membership cards, student cards, and the like), and personal transaction cards (e.g., prepaid cards, point cards, and the like), which include a recording medium configured to be able to change its color state by external excitation to prevent forgery. For example, Patent Literature 1 discloses an anti-forgery structure in which a security device and a transparent protective sheet are sequentially provided on a color developing layer having a laser color developing member.

[0003] LIST OF CITATIONS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2019-38141 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In recent years, while convenience is expected to improve due to the spread of the above-described various cards, forgery of the cards has been a major problem. In addition, distribution of counterfeit products such as medical supplies, automobile parts, toys, food, cosmetics, and electronic devices is also a problem. The distribution of these counterfeit products not only reduces the brand and image of the business, but can also affect the health and safety of users. Therefore, there is a strong need to improve the anti-forgery performance of cards and products.

[0008] An object of the present disclosure is to provide a laminate, a card, and a case that can improve the anti-forgery performance.

[0009] SOLUTION TO PROBLEM

[0010] To solve the above-described problem, the laminate according to the present disclosure includes:

[0011] a base material;

[0012] an intermediate layer provided on the base material and having a housing portion;

[0013] a recording medium provided in the housing portion; and

[0014] a cover layer provided on the intermediate layer, wherein

[0015] the housing portion is provided in a part of a plane of the intermediate layer,

[0016] the housing portion is a through hole that penetrates in a thickness direction of the intermediate layer or a recessed portion that is recessed in a thickness direction of the first intermediate layer,

[0017] The recording medium includes a color developing layer containing: a coloring compound having electron donating property; a color developer having electron accepting property; and a matrix resin,

[0018] The substrate, the intermediate layer, and the cover layer contain the same type of resin material, and

[0019] The substrate and the intermediate layer are joined to each other by fusion, and the intermediate layer and the cover layer are joined to each other by fusion.

[0020] The laminate according to the present disclosure includes:

[0021] A substrate;

[0022] An intermediate layer provided on the substrate and having a housing portion;

[0023] A recording medium provided in the housing portion; and

[0024] A cover layer provided on the intermediate layer, wherein

[0025] The housing portion is provided in a part of a plane of the intermediate layer,

[0026] The housing portion is a through hole that penetrates in a thickness direction of the first intermediate layer or a recessed portion that is recessed in the thickness direction of the first intermediate layer,

[0027] The recording medium includes a color developing layer containing: a coloring compound having electron donating property; a color developer having electron accepting property; and a matrix resin,

[0028] The substrate, the first intermediate layer, and the cover layer contain the same type of resin material, and

[0029] The substrate and the first intermediate layer are joined to each other by a heat adhesive, and the first intermediate layer and the cover layer are joined to each other by the heat adhesive. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a perspective view of a laminate according to a first embodiment of the present disclosure.

[0031] Figure 2 is a cross-sectional view along the line II-II of Figure 1

[0032] Figure 3 is a cross-sectional view of a recording medium.

[0033] Figure 4 is a cross-sectional view of a laminate according to a second embodiment of the present disclosure.

[0034] Figure 5 is a cross-sectional view of a laminate according to a modification example of the first embodiment of the present disclosure.​

[0035] Figure 6 is a cross-sectional view of a modification of the recording medium.

[0036] Figure 7 A is a plan view of the front surface of a smartphone. Figure 7 B is a plan view of the back surface of a smartphone.

[0037] Figure 8 is a perspective view of a notebook personal computer.

[0038] Figure 9 is a perspective view of a decorative container.

[0039] Figure 10 is a cross-sectional view of a recording medium.

[0040] Figure 11 is a view of a test apparatus for a 90-degree peel test.

[0041] Figure 12 A is a view explaining a preparation process of a 90-degree peel test. Figure 12 B is a view of a test apparatus for a 90-degree peel test.

[0042] Figure 13 is a perspective view of a laminate according to the third embodiment of the present disclosure.

[0043] Figure 14 is a cross-sectional view along the XIV-XIV line of Figure 13

[0044] Figure 15 is a cross-sectional view of a recording medium.

[0045] Figure 16 is a cross-sectional view of a laminate according to the fourth embodiment of the present disclosure.

[0046] Figure 17 is a cross-sectional view of a laminate according to a modification of the third embodiment of the present disclosure.

[0047] Figure 18 is a cross-sectional view of a recording medium.

[0048] Figure 19 is a cross-sectional view of a recording medium.

[0049] Figure 20 is a cross-sectional view of a recording medium.

[0050] Figure 21 is a cross-sectional view of a recording medium.

[0051] Figure 22 is a cross-sectional view of a recording medium. ​

[0052] Figure 23 is a cross-sectional view of a recording medium.

[0053] Figure 24 is a cross-sectional view of a recording medium.

[0054] Figure 25 is a perspective view of a booklet.

[0055] Figure 26 is a chart showing the results of a sample peel strength measurement. DETAILED DESCRIPTION

[0056] Embodiments of the present disclosure will be described in the following order. Note that in all the drawings of the following embodiments, the same or corresponding portions are denoted by the same reference numerals.

[0057] 1. First Embodiment (Example of Layered Body)

[0058] 1.1 Configuration of Layered Body

[0059] 1.2 Production Method of Layered Body

[0060] 1.3 Recording Method of Layered Body

[0061] 1.4 Effects and Advantages

[0062] 2. Second Embodiment (Example of Layered Body)

[0063] 2.1 Configuration of Layered Body

[0064] 2.2 Production Method of Layered Body

[0065] 2.3 Effects and Advantages

[0066] 3. Third Embodiment (Example of Layered Body)

[0067] 3.1 Configuration of Layered Body

[0068] 3.2 Effects and Advantages

[0069] 4. Fourth Embodiment (Example of Layered Body)

[0070] 4.1 Configuration of Layered Body

[0071] 4.2 Effects and Advantages

[0072] 5. Modified Example

[0073] 6. Reference Example and Example

[0074] <1 First Embodiment>

[0075] [1.1 Configuration of Layered Body]

[0076] Figure 1 is a perspective view of the laminate 10 according to the first embodiment of the present disclosure. Figure 2 is a cross-sectional view along the II-II line of Figure 1 . The laminate 10 includes a base material 11, an adhesive layer 12, an intermediate layer 13, an adhesive layer 14, a cover layer 15, and a recording medium 20. The laminate 10 can be a card (hereinafter referred to as “a security card or the like”), such as a security card, a financial settlement card (e.g., a credit card, a cash card, or the like), an identification card (e.g., an employee card, a membership card, a student card, or the like), or a personal transaction card (e.g., a prepaid card, a point card, or the like).

[0077] (Base material)

[0078] The base material 11 is a support that supports the recording medium 20 and the intermediate layer 13. The base material 11 can be a card. The base material 11 can have a color such as white. In the base material 11, a pattern, a picture, a photograph, a figure, a combination of two or more kinds thereof, or the like (hereinafter referred to as “a pattern or the like”) can be printed on one main surface of the base material 11 on a side on which the intermediate layer 13, the recording medium 20, or the like is provided.

[0079] The base material 11 contains, for example, a plastic. The base material 11 can contain, as necessary, at least one selected from the group consisting of a colorant, an antistatic agent, a flame retardant, a surface modifier, or the like.

[0080] The plastic contains, for example, at least one selected from the group consisting of an ester-based resin, an amide-based resin, an olefin-based resin, a vinyl-based resin, an acrylic resin, an imide-based resin, a styrene-based resin, an engineering plastic, or the like. In a case where the base material 11 contains two or more kinds of resins, the two or more kinds of resins can be mixed, copolymerized, or laminated.

[0081] The ester-based resin includes, for example, at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), a polyethylene terephthalate-isophthalate copolymer, a cyclohexanedimethanol-ethylene glycol copolymer of terephthalic acid, or the like. The amide-based resin includes, for example, at least one selected from the group consisting of nylon 6, nylon 66, nylon 610, or the like. The olefin-based resin includes, for example, at least one selected from the group consisting of polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), or the like. The vinyl-based resin includes, for example, polyvinyl chloride (PVC).

[0082] The acrylic resin includes, for example, at least one selected from the group consisting of polyacrylate, polymethacrylate, polymethyl methacrylate (PMMA), and the like. The imide-based resin includes, for example, at least one selected from the group consisting of polyimide (PI), polyamide-imide (PAI), polyether-imide (PEI), and the like. The styrene-based resin includes, for example, at least one selected from the group consisting of polycarbonate (PC), polystyrene (PS), high-impact polystyrene, acrylonitrile-styrene resin (AS resin), acrylonitrile-butadiene-styrene resin (ABS resin), and the like. The engineering plastic includes, for example, at least one selected from the group consisting of polycarbonate (PC), polyarylate (PAR), polysulfone (PSF), polyethersulfone (PES), polyphenylene ether (PPE), polyphenylene sulfide (PPS), polyether ketone (PEK), polyether ether ketone (PEEK), polyphenylene oxide (PPO), polyether sulfide, and the like.

[0083] (intermediate layer)

[0084] The intermediate layer 13 is provided on one main surface of the substrate 11, and the adhesive layer 12 is interposed between the substrate 11 and the intermediate layer 13. The intermediate layer 13 includes a housing portion 13A that houses the recording medium 20. The housing portion 13A is provided in a part of the plane of the intermediate layer 13. The housing portion 13A can be a through-hole that penetrates in the thickness direction of the intermediate layer 13. The intermediate layer 13 is a layer for suppressing a step formed by the recording medium 20 when the recording medium 20 is interposed between the substrate 11 and the cover layer 15. The intermediate layer 13 has substantially the same thickness as the recording medium 20, and covers an area on one main surface of the substrate 11 other than an area where the recording medium 20 is provided.

[0085] The intermediate layer 13 has a film shape. The intermediate layer 13 can have transparency. The intermediate layer 13 contains a plastic. As for the plastic, a similar material to the substrate 11 can be referred to.

[0086] (cover layer)

[0087] The cover layer 15 is provided above the intermediate layer 13 and the recording medium 20, and covers the intermediate layer 13 and the recording medium 20. The adhesive layer 14 is interposed between the intermediate layer 13 and the recording medium 20 and the cover layer 15. The cover layer 15 protects the members inside the laminate 10, that is, the recording medium 20 and the intermediate layer 13, and maintains the mechanical reliability of the laminate 10.

[0088] The cover layer 15 has a film shape. The cover layer 15 has transparency. The cover layer 15 contains a plastic. As for the plastic, a similar material to the substrate 11 can be referred to. A pattern or the like can be printed on at least one main surface of the cover layer 15.

[0089] (adhesive layer)

[0090] The adhesive layer 12 is provided between the base material 11 and the intermediate layer 13 that houses the recording medium 20, and joins the base material 11 and the intermediate layer 13 that houses the recording medium 20 to each other. The adhesive layer 14 is provided between the intermediate layer 13 that houses the recording medium 20 and the cover layer 15, and joins the intermediate layer 13 that houses the recording medium 20 and the cover layer 15 to each other. The adhesive layers 12 and 14 have transparency. The adhesive layers 12 and 14 contain a heat adhesive. The heat adhesive contains a thermosetting resin. The thermosetting resin includes, for example, at least one selected from the group consisting of an epoxy-based resin, a urethane-based resin, and the like. From the viewpoint of reducing damage to the recording medium 20, the curing temperature of the heat adhesive is preferably in the temperature range of 100°C to 120°C.

[0091] (recorded medium)

[0092] Figure 3 is a cross-sectional view of the recording medium 20. The recording medium 20 is configured to be able to change its color state by external excitation. By this change in color state, for example, a pattern or the like can be recorded on the recording medium 20. The external excitation is laser light. From the viewpoint of improving the anti-counterfeiting performance, the change in color state is preferably an irreversible change. That is, the system of the recording medium 20 is preferably a write-once system in which a pattern or the like can be written only once. The recording medium 20 is preferably installed in the housing portion 13A of the intermediate layer 13, and the recording medium 20 and the intermediate layer 13 are integrated. As a result, it becomes difficult to distinguish the boundary between the recording medium 20 and the intermediate layer 13 in the in-plane direction of the laminate 10 from the appearance. Therefore, it is possible to improve the anti-counterfeiting performance.

[0093] The recording medium 20 includes, in order, a base material 21, an intermediate layer 32A, a color developing layer 24, an intermediate layer 32B, a color developing layer 27, an intermediate layer 32C, and a color developing layer 30. More specifically, the recording medium 20 includes, in order, a base material 21, a pressure-sensitive adhesive layer 22, a thermal barrier layer 23, a color developing layer 24, a pressure-sensitive adhesive layer 25, a thermal barrier layer 26, a color developing layer 27, a pressure-sensitive adhesive layer 28, a thermal barrier layer 29, and a color developing layer 30. As shown in Figure 3 The recording medium 20 can further include, as shown in Figure 10 The recording medium 20 can further include, as shown in

[0094] (base material)

[0095] The substrate 21 is a support for supporting the color-developing layers 24, 27, 30, and the like. The substrate 21 preferably contains a material having excellent heat resistance and excellent dimensional stability in a planar direction. The substrate 21 can have light-transmitting property or non-light-transmitting property. The substrate 21 can be, for example, a rigid substrate such as a wafer, or can be a flexible thin glass, a film, paper, or the like. By using a flexible substrate as the substrate 21, a flexible (bendable) recording medium can be realized.

[0096] Examples of the constituent material of the substrate 21 include inorganic materials, metallic materials, plastics, and the like. The inorganic materials include, for example, at least one selected from the group consisting of silicon (Si), silicon oxide (SiOx), silicon nitride (SiNx), aluminum oxide (AlOx), and the like. The silicon oxide includes glass, spin-on glass (SOG), and the like. The metallic materials include, for example, at least one selected from the group consisting of aluminum (Al), nickel (Ni), stainless steel, and the like. As for the plastics, similar materials to those of the substrate 11 can be referred to.

[0097] Note that a reflective layer (not shown) can be provided on at least one main surface of the substrate 21, or the substrate 21 itself can have a function as a reflective layer. The substrate 21 having such a configuration is capable of realizing clearer color display.

[0098] (intermediate layer)

[0099] The intermediate layer 32A is provided between the substrate 21 and the color-developing layer 24. The intermediate layer 32A can join the substrate 21 and the color-developing layer 24. The intermediate layer 32A can be capable of thermally insulating the substrate 21 and the color-developing layer 24, and inhibiting diffusion of constituent materials between the substrate 21 and the color-developing layer 24. The intermediate layer 32A includes the pressure-sensitive adhesive layer 22 and the thermal insulation layer 23. The pressure-sensitive adhesive layer 22 is adjacent to the substrate 21, and the thermal insulation layer 23 is adjacent to the color-developing layer 24. However, the intermediate layer 32A can include only the pressure-sensitive adhesive layer 22.

[0100] The intermediate layer 32B is provided between the color-developing layer 24 and the color-developing layer 27. The intermediate layer 32B can join the color-developing layer 24 and the color-developing layer 27. The intermediate layer 32B can be capable of thermally insulating the color-developing layer 24 and the color-developing layer 27, and inhibiting diffusion of constituent materials between the color-developing layer 24 and the color-developing layer 27. The intermediate layer 32B includes the pressure-sensitive adhesive layer 25 and the thermal insulation layer 26. However, the intermediate layer 32B can include only the pressure-sensitive adhesive layer 25.

[0101] The intermediate layer 32C is provided between the color developing layer 27 and the color developing layer 30. The intermediate layer 32C can join the color developing layer 27 and the color developing layer 30. The intermediate layer 32C can be able to thermally insulate the color developing layer 27 and the color developing layer 30 and suppress diffusion of constituent materials between the color developing layer 27 and the color developing layer 30. The intermediate layer 32C includes the pressure-sensitive adhesive layer 28 and the thermal insulation layer 29. However, the intermediate layer 32C can include only the pressure-sensitive adhesive layer 28.

[0102] The intermediate layer 32D is provided between the color developing layer 30 and the protective layer 31. The intermediate layer 32D can join the color developing layer 30 and the protective layer 31. The intermediate layer 32D can be able to thermally insulate the color developing layer 30 and the protective layer 31 and suppress diffusion of constituent materials between the color developing layer 30 and the protective layer 31. The intermediate layer 32D includes the pressure-sensitive adhesive layer 33 and the thermal insulation layer 34. However, the intermediate layer 32D can include only the pressure-sensitive adhesive layer 33.

[0103] (Color developing layer)

[0104] The color developing layers 24, 27, and 30 are configured to be able to change their color states by external excitation such as laser light or heat. The color developing layers 24, 27, and 30 are formed using materials capable of stable recording and control of the color developing state. The color developing layers 24, 27, and 30 contain a coloring compound having electron-donating property, a color developing agent having electron-accepting property and corresponding to the coloring compound, a matrix polymer (binder), and a light-heat conversion material. In addition to the above-described materials, the color developing layers 24, 27, and 30 can contain, as necessary, for example, at least one additive selected from the group consisting of a sensitizer, an ultraviolet absorbing material, and the like.

[0105] The color developing layers 24, 27, and 30 contain coloring compounds that exhibit colors of different hues from each other. That is, the coloring compounds contained in the color developing layers 24, 27, and 30 exhibit different colors in the color developing state. The coloring compound contained in the color developing layer 24, for example, exhibits cyan color in the color developing state. The coloring compound contained in the color developing layer 27, for example, exhibits magenta color in the color developing state. The coloring compound contained in the color developing layer 30, for example, exhibits yellow color in the color developing state. The light-heat conversion materials contained in the color developing layers 24, 27, and 30 absorb laser light of different wavelength ranges (for example, near-infrared laser light different from each other) and generate heat.

[0106] The thickness of each of the color developing layers 24, 27, and 30 is preferably 1 μm to 20 μm, more preferably 2 μm to 15 μm. When the thickness of the color developing layers 24, 27, and 30 is 1 μm or more, sufficient color developing density can be obtained. On the other hand, when the thickness of each of the color developing layers 24, 27, and 30 is 20 μm or less, it is possible to suppress the amount of heat used by each of the color developing layers 24, 27, and 30 from becoming too large. Thus, it is possible to suppress deterioration of color developing properties.

[0107] (colored compound)

[0108] The colored compound is, for example, a colorless dye. The colorless dye can be, for example, an existing dye used for thermal paper. Specific examples thereof include a compound having an electron-donating group in the molecule, represented by the following formula (1).

[0109] [Chemical Formula 1]

[0110]

[0111] The coloring compound is not particularly limited and can be appropriately selected depending on the use. Specific examples of the coloring compound other than the compound represented by the above formula (1) include fluorine-based compounds, triphenylmethane o-benzene compounds, azaphthal compounds, phenothiazine compounds, leuco compounds, indole phthalide compounds, and the like. Other examples include 2-anilino-3-methyl-6-diethylaminofluorene, 2-anilino-3-methyl-6-di(n-butylamino)fluorene, 2-anilino-3-methyl-6-(N-n-propyl-N-methylamino)fluorene, 2-anilino-3-methyl-6-(N-isopropyl-N-methylamino)fluorene, 2-anilino-3-methyl-6-(N-isobutyl-N-methylamino)fluorene, 2-anilino-3-methyl-6-(N-sec-butyl-N-methylamino)fluorene, 2-anilino-3-methyl-6-(N-n-pentyl-N-ethylamino)fluorene, 2-anilino-3-methyl-6-(N-isopentyl-N-ethylamino)fluorene, 2-anilino-3-methyl-6-(N-cyclohexyl-N-methylamino)fluorene, 2-anilino-3-methyl-6-(N-ethyl-p-toluidino)fluorene, 2-anilino-3-methyl-6-(N-methyl-p-toluidino)fluorene, 2-(m-trichloromethyl-anilino)-3-methyl-6-diethylamino-fluorene, 2-m-trichloromethyl-anilino-3-methyl-6-diethylamino-fluorene, 2-m-trichloromethyl-anilino-3-methyl-6-(2-(2,4-dimethyl-anilino)-3-methyl-6-diethylamino-fluorene, 2-(N-ethyl-p-toluidino)-3-methyl-6-(N-ethyl-anilino)fluorene, 2-(N-ethyl-p-toluidino)-3-methyl-6-(N-propyl-p-toluidino)fluorene, 2-dimethyl-6-diethylamino-fluorene, 2-(o-chloro-anilino)-6-dibutylamino-fluorene, 2-(m-trifluoromethyl-anilino)-6-diethylamino-fluorene, 2,3-dimethyl-6-dimethylamino-fluorene, 3-methyl-6-(N-ethyl-p-toluidino)fluorene, 2-chloro-6-diethylamino-fluorene, 2-bromo-6-diethylamino-fluorene, 2-chloro-6-dipropylamino-fluorene, 3-chloro-6-cyclohexylamino-fluorene, 3-bromo-6-cyclohexylamino-fluorene, 2-chloro-6-(N-ethyl-N-isopentylamino)fluorene, 2-chloro-3-methyl-6-diethylamino-fluorene,2-anilino-3-chloro-6-diethylaminofluorene, 2-(1-ethyl-2-methyl-anilino)-3-diethylaminofluorene, 2-(1-ethyl-2-methyl-anilino)-3-diethylaminofluorene, 3-(1-ethyl-2-methylindol-3-yl)-3-(2-ethoxy-4-diethylaminophenyl)-4-azaphthalene, 3-(1-ethyl-2-methylindol-3-yl)-3-(2-ethoxy-4-diethylaminophenyl)-7-(1-ethyl-2-methylindol-3-yl)-3-(2-ethoxy-4-diethylaminophenyl)-7-3-(1-octyl-2-methylindol-3-yl)-3-(2-ethoxy-4-diethylaminophenyl)-4-azaphthalene, 3-(1-ethyl-2-methylindol-3-yl)-3-(2-methyl-4-diethylaminophenyl)-4-azaphthalene, 3-(1-ethyl-2-methylindol-3-yl)-3-(2-methyl-4-diethylaminophenyl)-4-azaphthalene, 3-(1-ethyl-2-methylindol-3-yl)-3-(2-2-hexyloxy-4-diethylaminophenyl)-4-azaphthalene, 3,3-bis(2-ethoxy-4-diethylaminophenyl)-7-azaphthalene, 2-p-acetanilino-6-(N-n-pentyl-N-n-butylamino)fluorene, 2-benzylamino-6-(N-ethyl-p-toluidino)fluorene, 2-benzylamino-6-(N-methyl-2,4-dimethyl-anilino)fluorene, 2-benzylamino-6-(N-ethyl-2,4-dimethyl-anilino)fluorene, 2-benzylamino-6-(N-methyl-p-toluidino)fluorene, 2-benzylamino-6-(N-ethyl-p-toluidino)2-(di-p-methylbenzylamino)-6-(N-ethyl-p-toluidino)fluorene, 2-(α-phenylethylamino)-6-(N-ethyl-p-toluidino)fluorene, 2-methylamino-6-(N-methyl-anilino)fluorene, 2-methylamino-6-(N-ethyl-anilino)fluorene, 2-methylamino-6-(N-propyl-anilino)fluorene, 2-ethylamino-6-(N-methyl-p-toluidino)fluorene, 2-ethylamino-6-(N-ethyl-2,4-dimethylanilino)fluorene, 2-dimethylamino-6-(N- methylanilino)fluorene, 2-dimethylamino-6-(N- ethylanilino)fluorene, 2-dimethylamino-6-(N- methylanisilino)fluorene, 2-diethylamino-6-(N- methylanisilino)fluorene, 2-dipropylamino-6-(N- methylanilino)fluorene, 2-dipropylamino-6-(N- ethylanilino)fluorene, 2-amino-6-(N-methylanilino)fluorene, 2-amino-6-(N-ethylanilino)fluorene, 2-amino-6-(N-methylanisilino)fluorene, 2-amino-6-(N-ethylanisilino)fluorene, 2-amino-6-(N-propylanisilino)fluorene, 2-amino-6-(N-methyl-ethylanilino)fluorene, 2-amino-6-(N-ethyl-ethylanilino)fluorene, 2-amino-6-(N-propyl-ethylanilino)fluorene, 2-amino-6-(N-methyl-2,4-dimethylanilino)fluorene, 2-amino-6-(N-propyl-2,4-dimethylanilino)fluorene, 2-amino-6-(N-methyl-p-chloroanilino)fluorene, 2-amino-6-(N-ethyl-p-chloroanilino)fluorene, 2-amino-6-(N-propyl-p-chloroanilino)fluorene, 1,2-benzo-6-(N-ethyl-N-isopentylamino)fluorene, 1,2-benzo-6-dibutylaminofluorene, 1,2-benzo-6-(N-methyl-N-cyclohexylamino)fluorene, 1,2-benzo-6-(N-ethyl-N-toluidino)fluorene, and the like. Each of the color-developing layers 24, 27, and 30 can contain one or two or more of the above-described coloring compounds alone.

[0112] (color developer)

[0113] The color developer is, for example, a color developer that develops a colorless coloring compound. The color developer can be in a particulate form. Examples of the color developer include at least one selected from the group consisting of phenol derivatives, salicylic acid derivatives, urea derivatives, and the like. Specific examples thereof include a hydroxybenzoic acid type compound containing an electron-accepting group in a molecule, which is represented by the following formula (2). The hydroxybenzoic acid type compound can be a bis(hydroxybenzoic acid) type compound.

[0114] [Chemical Formula 2]

[0115]

[0116] (wherein X is any one of -NHCO-, -CONH-, -NHCONH-, -CONHCO-, -NHNHCO-, -CONHNH-, -CONHNHCO-, -NHCOCONH-, -NHCONHCO-, -CONHCONH-, -NHNHCONH-, -NHCONHNH-, -CONHNHCONH-, -NHCONHNHCO-, and -CONHNHCONH-, and R is a linear hydrocarbon group having 25 to 34 carbon atoms.)

[0117] The bonding position of the hydroxyl group (-OH), the carboxyl group (-COOH), and the -X-R group in formula (2) is not limited. For example, the hydroxybenzoic acid type compound can have a structure in which the hydroxyl group and the carboxyl group are bonded at the ortho position of the benzene, i.e., a salicylic acid skeleton.

[0118] (Matrix polymer)

[0119] The matrix polymer (matrix resin) preferably has a function as a binder. The matrix polymer is preferably one that makes the coloring compound, the color developer, and the light-heat conversion material easily uniformly disperse by using the matrix polymer. Examples of the matrix polymer include at least one selected from the group consisting of a thermosetting resin, and a thermoplastic resin. Specific examples thereof include at least one selected from the group consisting of a polyvinyl chloride-based resin, a polyvinyl acetate-based resin, a vinyl chloride-vinyl acetate copolymer resin, an ethyl cellulose-based resin, a polystyrene-based resin, a styrene-based copolymer resin, a phenoxy resin-based resin, a polyester-based resin, an aromatic polyester-based resin, a polyurethane-based resin, a polycarbonate-based resin, a polyacrylate-based resin, a polymethacrylate-based resin, an acrylic copolymer resin, a maleic acid-based polymer resin, a polyvinyl alcohol-based resin, a modified polyvinyl alcohol-based resin, a hydroxyethyl cellulose-based resin, a carboxymethyl cellulose-based resin, a starch-based resin, and the like.

[0120] The matrix polymer preferably contains a polycarbonate-based resin. When the matrix polymer contains a polycarbonate-based resin, the light resistance of the background of the recording medium 20 can be improved. Here, the polycarbonate-based resin is a resin having a carbonate group (-0-(C=0)-0-) as a structural unit at least in the main chain. Therefore, in addition to the carbonate group, other structural units can be included in the main chain.

[0121] The proportion of the color developer in the total amount of the color developer and the base resin is preferably 16% by mass or less. When the proportion of the color developer is 16% by mass or less, the adhesion between the color developing layers 24, 27, and 30 and the layers (particularly, the heat insulating layers 23, 26, and 29) adjacent to the color developing layers 24, 27, and 30 can be improved.

[0122] The proportion of the color developer in the total amount of the color developer and the base resin is measured in the following manner. The composition of the color developer and the base polymer of the color layer is measured by mapping using a micro FTIR. Alternatively, the proportion of the color developer is calculated using the difference in solubility between the color developer and the base polymer in the following manner: the color developer and the base polymer are dissolved separately in a suitable organic solvent and their weights are measured.

[0123] The content of the base polymer in the color layers 24, 27 and 30 is preferably 84% by mass or more from the viewpoint of improving the adhesion between the color layers 24, 27 and 30 and the layers adjacent to the color layers 24, 27 and 30, particularly the heat insulating layers 23, 26 and 29. The content of the base polymer is preferably 50-70% by mass, more preferably 58-65% by mass, from the viewpoint of suppressing the reduction in color developability of the color layers 24, 27 and 30. In the case where the content of the base polymer is 50-70% by mass, the layers adjacent to the color layers 24, 27 and 30 are preferably selected so as to obtain good adhesion.

[0124] The content of the base polymer in the color layers 24, 27 and 30 is measured in the following manner. The composition of the color developer and the base polymer of the color layers 24, 27 and 30 is measured by mapping using a micro FTIR. Alternatively, the content of the base polymer is calculated using the difference in solubility between the contents of the color layers 24, 27 and 30 in the following manner: each of the contents is dissolved in a suitable organic solvent and its weight is measured.

[0125] (Photothermal conversion material)

[0126] For example, the light-to-heat conversion material absorbs light in a predetermined wavelength range in the near-infrared region and generates heat. As the light-to-heat conversion material, for example, a near-infrared absorbing dye having an absorption peak in a wavelength range of 700 nm to 2000 nm and having little absorption in the visible light region is preferably used. Specific examples of the light-to-heat conversion material include at least one selected from the group consisting of a compound having a phthalocyanine skeleton (phthalocyanine dye), a compound having a squarylium skeleton (squarylium dye), an inorganic compound, and the like. Examples of the inorganic compound include at least one selected from the group consisting of a metal complex (for example, a dithiol complex), a diammonium salt, an ammonium salt, an inorganic compound, and the like. Examples of the inorganic compound include at least one selected from the group consisting of graphite, carbon black, a metal powder particle, a metal oxide (for example, cobaltic sesquioxide, iron oxide, chromium oxide, copper oxide, titanium black, and indium tin oxide (ITO)), a metal nitride (for example, niobium nitride), a metal carbide (for example, tantalum carbide), a metal sulfide, various magnetic powders, and the like. In addition, a compound having a cyanine skeleton (cyanine dye) having excellent light resistance and heat resistance can be used. Note that, here, the excellent light resistance means that the compound does not decompose due to light irradiation such as a fluorescent lamp in a use environment. The excellent heat resistance means that, for example, when a film is formed using the compound together with a polymer matrix and the film is stored at 150°C for 30 minutes, the maximum absorption peak value of the absorption spectrum does not change by 20% or more. Examples of such a compound having a cyanine skeleton include a compound having any one of SbF6, PF6, BF4, ClO4, CF3SO3, and (CF3SO3)2N as a counter ion in a molecule, or a methane chain including a 5-membered ring or a 6-membered ring. Note that, in the first embodiment, the compound having a cyanine skeleton used for the recording medium 20 preferably has both any one of the above-described counter ions and the ring structure (for example, the 5-membered ring and the 6-membered ring in the methane chain), and when the compound has at least one of the counter ion or the ring structure, sufficient light resistance and heat resistance are ensured.

[0127] Note that, as the light-to-heat conversion material, a light-to-heat conversion material having a narrow light absorption band in a wavelength range of 700 nm to 2000 nm, for example, is preferably selected, and has a light absorption band that does not overlap between the color developing layers 24, 27, and 30. As a result, it is possible to selectively develop a desired layer between the color developing layers 24, 27, and 30.

[0128] (Heat Insulating Layer)

[0129] The heat insulating layer 23 is provided between the base material 21 and the color developing layer 24, and insulates the base material 21 and the color developing layer 24. The heat insulating layer 26 is provided between the color developing layer 24 and the color developing layer 27, and insulates the color developing layer 24 and the color developing layer 27. The heat insulating layer 29 is provided between the color developing layer 27 and the color developing layer 30, and insulates the color developing layer 27 and the color developing layer 30. The heat insulating layer 34 is provided between the color developing layer 30 and the protective layer 31, and insulates the color developing layer 30 and the protective layer 31. The heat insulating layers 23, 26, 29, and 34 contain, for example, a general-purpose high molecular material having a semi-transparency. Specific examples of the material include at least one selected from the group consisting of an acrylic resin, a polyvinyl chloride-based resin, a polyvinyl acetate-based resin, a vinyl chloride-vinyl acetate copolymer resin, an ethyl cellulose-based resin, a polystyrene-based resin, a styrene-based copolymer resin, a phenoxy-based resin, a polyester-based resin, an aromatic polyester-based resin, a polyurethane-based resin, a polycarbonate-based resin, a polyacrylate-based resin, a polymethacrylate-based resin, an acrylic copolymer resin, a maleic acid-based polymer resin, a polyvinyl alcohol-based resin, a modified polyvinyl alcohol-based resin, a hydroxyethyl cellulose-based resin, a carboxymethyl cellulose-based resin, a starch-based resin, and the like. Note that the heat insulating layers 23, 26, 29, and 34 can contain, for example, various additives such as an ultraviolet absorber.

[0130] The heat insulating layers 23, 26, 29, and 34 can be ultraviolet-cured resin layers. The ultraviolet-cured resin layers contain an ultraviolet-cured resin composition cured by a polymerization reaction. More specifically, for example, the ultraviolet-cured resin layers contain a polymer of a polymerizable compound and a polymerization initiator, the structure of the polymerization initiator being changed due to active species generated by irradiation of external energy (ultraviolet rays). The ultraviolet-cured resin composition includes, for example, at least one selected from the group consisting of a radical polymerization-type ultraviolet-cured resin composition, a cationic polymerization-type ultraviolet-cured resin composition, and the like. The ultraviolet-cured resin composition can contain, as needed, at least one selected from the group consisting of a sensitizer, a filler, a stabilizer, a leveling agent, a defoaming agent, a viscosity modifier, and the like. The ultraviolet-cured resin composition can be an ultraviolet-cured resin composition for a hard coat layer. The ultraviolet-cured resin mixture can be an acrylic ultraviolet-cured resin composition.

[0131] The heat insulating layers 23, 26, 29, and 34 can contain an inorganic material having a semi-transparency. For example, when porous silica, alumina, titanium dioxide, carbon, a composite material thereof, or the like is used, the thermal conductivity is reduced, and the heat insulating effect is high, which is preferable. The heat insulating layers 23, 26, 29, and 34 can be formed by, for example, a sol-gel method.

[0132] The formation of physical steps can be suppressed by adjusting the thickness of the thermal barrier layers 23, 26, 29, and 34 so that the thickness of the recording medium 20 is equal to the thickness of the intermediate layer 13. The thickness of the thermal barrier layers 23, 26, 29, and 34 is preferably 3 μm to 100 μm, more preferably 5 μm to 50 μm. When the thickness of the thermal barrier layers 23, 26, 29, and 34 is 3 μm or more, sufficient thermal barrier effects can be obtained. On the other hand, when the thickness of the thermal barrier layers 23, 26, 29, and 34 is 100 μm or less, deterioration of the translucency can be suppressed. In addition, the decrease in the bending resistance of the recording medium 20 can be suppressed, and the occurrence of defects such as cracks can be suppressed.

[0133] The surface pencil hardness of the thermal barrier layers 23, 26, 29, and 34 is preferably 2B or more, more preferably H or more. When the surface pencil hardness of the thermal barrier layers 23, 26, 29, and 34 is 2B or more, the density of the thermal barrier layers 23, 26, 29, and 34 is high, and thus the diffusion of substances through the intermediate layers 32A, 32B, 32C, and 32D can be further suppressed. For example, in the case where the surface pencil hardness of the thermal barrier layers 26 and 29 is 2B or more, the diffusion of the coloring compound through the intermediate layers 32B and 32C can be further suppressed. Thus, the change in the color tone of the color development layers 24, 27, and 30 during long-term storage or the like can be further suppressed. The ultraviolet-curable resin layer is preferable because the thermal barrier layers 23, 26, 29, and 34 have the above-described pencil hardness.

[0134] The surface pencil hardness of the thermal barrier layer 23 is measured as follows. First, the laminate 10 is disassembled to expose the surface of the thermal barrier layer 23. Next, the surface pencil hardness of the thermal barrier layer 23 is measured in accordance with JIS K5600-5-4. The measurement is performed in a standard state atmosphere, at a temperature of 23 ± 1°C and a relative humidity of 50 ± 5%. The surface pencil hardness of the thermal barrier layers 26, 29, and 34 is also measured in a similar procedure to the surface pencil hardness of the thermal barrier layer 23.

[0135] (Pressure-sensitive adhesive layer)

[0136] The pressure-sensitive adhesive layer 22 is provided between the substrate 21 and the heat-insulating layer 23, and bonds the substrate 21 and the heat-insulating layer 23 to each other. The pressure-sensitive adhesive layer 25 is provided between the color developing layer 24 and the heat-insulating layer 26, and bonds the color developing layer 24 and the heat-insulating layer 26 to each other. The pressure-sensitive adhesive layer 28 is provided between the color developing layer 27 and the heat-insulating layer 29, and bonds the color developing layer 27 and the heat-insulating layer 29 to each other. The pressure-sensitive adhesive layer 33 is provided between the color developing layer 30 and the protective layer 31, and bonds the color developing layer 30 and the protective layer 31 to each other. In the case where the recording medium 20 does not include the heat-insulating layer 23, the pressure-sensitive adhesive layer 22 bonds the substrate 21 and the color developing layer 24. In this case, the pressure-sensitive adhesive layer 22 can have a function as a heat-insulating layer and / or a diffusion-preventing layer. In the case where the recording medium 20 does not include the heat-insulating layer 26, the pressure-sensitive adhesive layer 25 bonds the color developing layer 24 and the color developing layer 27. In this case, the pressure-sensitive adhesive layer 25 can have a function as a heat-insulating layer and / or a diffusion-preventing layer. In the case where the recording medium 20 does not include the heat-insulating layer 29, the pressure-sensitive adhesive layer 28 bonds the color developing layer 27 and the color developing layer 30. In this case, the pressure-sensitive adhesive layer 28 can have a function as a heat-insulating layer and / or a diffusion-preventing layer. In the case where the recording medium 20 does not include the heat-insulating layer 34, the pressure-sensitive adhesive layer 33 bonds the color developing layer 30 and the protective layer 31. In this case, the pressure-sensitive adhesive layer 33 can have a function as a heat-insulating layer and / or a diffusion-preventing layer. In the present specification, the term "and / or" means at least one, and, for example, in the case of "X and / or Y", means three ways of only X, only Y, and X and Y.

[0137] The pressure-sensitive adhesive layers 22, 25, 28, and 33 contain a pressure-sensitive adhesive. The pressure-sensitive adhesive includes, for example, at least one selected from the group consisting of an acrylic resin, a silicone-based resin, a urethane-based resin, an epoxy-based resin, and an elastomer-based material.

[0138] (protective layer)

[0139] The protective layer 31 is a layer for protecting the surface of the recording medium 20, and is formed using, for example, at least one of an ultraviolet-curable resin or a thermosetting resin. The protective layer 31 is preferably a hard coat layer. The thickness of the protective layer 31 is, for example, 0.1 μm to 20 μm.

[0140] (average peeling strength between layers)

[0141] The average peeling strength at the interface between the layers constituting the laminate 10 is preferably 3.5 N / cm or more, more preferably 4.0 N / cm or more, more preferably 4.5 N / cm or more, and particularly preferably 5.0 N / cm or more. When the average peeling strength at the interface between the layers is 3.5 N / cm or more, peeling at the interface between the layers constituting the laminate 10 can be suppressed. Thus, the anti-forgery performance and the anti-tampering performance of the laminate 10 can be improved. Here, the layers constituting the laminate 10 can include the layers constituting the recording medium 20.

[0142] The average peeling strength at the interface between the layers is determined by performing a 90-degree peeling test. Since the method of measuring the average peeling strength at the interface between the layers is similar, only the method of measuring the average peeling strength at the interface between the heat-insulating layer 26 and the color-developing layer 27 will be described below. Figure 11 Only the method of measuring the average peeling strength at the interface between the heat-insulating layer 26 and the color-developing layer 27 will be described.

[0143] First, the laminate 10 is cut into a band shape having a width of 10 mm and a length of 100 mm to prepare a test piece 60, and the test piece 60 is left in the atmosphere under standard conditions of a temperature of 23 ± 1°C and a relative humidity of 50 ± 5% for 24 hours or more. Note that, in the case of measuring the average peeling strength at the interface included in the recording medium 20, the test piece 60 is cut so as to include the recording medium 20. Hereinafter, in the test piece 60, the laminate on the lower side of the interface between the heat-insulating layer 26 and the color-developing layer 27 is referred to as an adherend 60A, and the laminate on the upper side of the interface is referred to as an adherend 60B (see FIG. 6). Figure 3 Next, at one end of the test piece 60 in the longitudinal direction, a sharp blade such as a cutter is used to cut a slit between the adherend 60A and the adherend 60B, the adherend 60B is peeled in the longitudinal direction by a length of 20 mm to form a gripping margin, and then a surface on the side of the adherend 60A of the test piece 60 is fixed to a test stage 71 using a strong pressure-sensitive adhesive. As the pressure-sensitive adhesive, a pressure-sensitive adhesive having a pressure-sensitive adhesive force high enough to prevent the test piece 60 from peeling from the test stage 71 when measuring the peeling strength between the heat-insulating layer 26 and the color-developing layer 27 is selected, for example, a strong pressure-sensitive tape scotch (registered trademark) manufactured by 3M Company.

[0144] Next, one end of a stretching member 61 is joined to a surface of the adherend 60B on one side of the color-developing layer 27. As the stretching member 61, a band-shaped film having a strength high enough to prevent elongation or breakage when measuring the peeling strength is used. Furthermore, one end of the stretching member 61 is joined to the adherend 60B with an adhesive force high enough to prevent the stretching member 61 from peeling from the adherend 60B when measuring the peeling strength. Figure 11An example in which the stretching member 61 is used as the holding edge is shown, but the adherend 60B can be directly clamped without using the stretching member 61 if it has sufficient stroke.

[0145] Next, the holding edge of the stretching member 61 is passed between a pair of movable rollers 73A and 73B of a jig 72, and then clamped and fixed by the jig (metal plate) 62 of the tensile compression tester SV-55C2H manufactured by IMADA-SS Co. for 10 mm or more of the holding edge. The movable rollers 73A and 73B serve as a fulcrum of peeling in the 90-degree peeling test. Next, the 90-degree peeling test is performed using the tensile compression tester, and the force [N / 10 mm] and the stroke [mm] are monitored as voltage values in a data logger manufactured by Keyence Corporation, and the voltage values are converted into force and stored as CSV output data in a memory. Note that the 90-degree peeling test is performed at a tensile speed of 5 mm / sec in a standard state in which the temperature is 23 ± 1°C and the relative humidity is 50 ± 5%. The stroke is set to 50 mm or more.

[0146] The 90-degree peeling test is performed a total of 3 times, and a position at which the peeling strength stabilizes (a position at which the force rise becomes gentle) is set as a starting point (0 mm), and the CSV output data from the starting point to a position 50 mm away from the starting point is arithmetically averaged to calculate the average value. As a result, the average peeling strength between the heat insulating layer 26 and the color developing layer 27 is determined. In the case where there is a point (spike) at which the peeling force suddenly decreases in the CSV output data, the average peeling strength excluding the point (spike) is calculated.

[0147] The average value of the minimum peeling strength in the interlayer peeling strength of the layered body 10 is preferably 3.5 N / cm or more, more preferably 4.0 N / cm or more, more preferably 4.5 N / cm or more, and particularly preferably 5.0 N / cm or more. When the average value of the minimum peeling strength is 3.5 N / cm or more as described above, peeling between the layers constituting the layered body 10 can be suppressed. Thus, the anti-counterfeiting performance and the tamper resistance of the layered body 10 can be improved. Here, the layers constituting the layered body 10 can include the layers constituting the recording medium 20.

[0148] The average value of the minimum peeling strength in the peeling strength between the layers constituting the layered body 10 is determined by performing the 90-degree peeling test. Hereinafter, the method of measuring the average value of the minimum peeling strength in the interlayer peeling strength will be described with reference to Figure 12 A and Figure 12 B.

[0149] First, the laminate 10 is cut into a tape shape having a width of 10 mm and a length of 100 mm to prepare a test piece 60, and the test piece 60 is left in the atmosphere under standard conditions of a temperature of 23±1°C and a relative humidity of 50±5% for 24 hours or more. Next, as shown in Figure 12 A, the test piece 60 surface on the substrate 11 side is fixed to a test stand 71 with a strong pressure-sensitive adhesive, and the tensile member 61 is joined to the surface of the test piece 60 on the cover layer 15 side. As the tensile member 61, a tape-shaped film having a strength sufficient to prevent elongation or breakage when measuring the average peeling strength is used. Furthermore, one end of the tensile member 61 is joined to the adherend 60B with an adhesive force high enough not to peel from the adherend 60B when measuring the average peeling strength.

[0150] Next, as shown in Figure 12 B, the clamped edge of the tensile member 61 is passed between a pair of movable rollers 73A and 73B of a jig 72, and then 10 mm or more of the clamped edge is clamped and fixed with a jig (metal plate) 62 of a tensile compression tester SV-55C2H manufactured by IMADA-SS Co. The subsequent process is similar to the method of measuring the average peeling strength at the interface between the heat-insulating layer 26 and the color-developing layer 27. As described above, the average value of the minimum peeling strength among the peeling strengths between the layers constituting the laminate 10 is determined.

[0151] The interface having the lowest average peeling strength among the interfaces of the laminate 10 is preferably located between the color-developing layer 24 and the color-developing layer 27 or between the color-developing layer 27 and the color-developing layer 30. When the laminate 10 is disassembled, the recording medium 20 is also disassembled, making it difficult to take out and use the recording medium 20. Therefore, the anti-counterfeiting performance of the laminate 10 can be improved.

[0152] (Material combinations of substrate, intermediate layer, and cover layer)

[0153] The substrate 11, the intermediate layer 13, and the cover layer 15 preferably contain the same type of resin material from the viewpoint of improving adhesion. The resin material can be a thermoplastic resin. The substrate 11, the intermediate layer 13, and the cover layer 15 preferably contain a polycarbonate (PC) type resin or a polyethylene terephthalate (PET) type resin from the viewpoint of environmental considerations. The substrate 11, the intermediate layer 13, and the cover layer 15 preferably contain a polycarbonate (PC) type resin or a polyvinyl chloride (PVC) type resin from the viewpoint of improving durability. The substrate 11, the intermediate layer 13, and the cover layer 15 preferably contain a polycarbonate (PC) type resin from the viewpoints of improving adhesion, environmental considerations, and improving durability.

[0154] For example, it can be confirmed that the substrate 11, the intermediate layer 13, and the cover layer 15 contain the same type of resin material as follows. First, the substrate 11, the intermediate layer 13, and the cover layer 15 are taken out of the laminate 10. Next, infrared spectra of the substrate 11, the intermediate layer 13, and the cover layer 15 are acquired by infrared absorption spectroscopy (IR). Next, it is confirmed that the substrate 11, the intermediate layer 13, and the cover layer 15 contain the same type of resin material by comparing the infrared spectra acquired for each layer.

[0155] Further, the type of the resin material contained in each of the substrate 11, the intermediate layer 13, and the cover layer 15 can be confirmed using the infrared spectrum acquired for each layer.

[0156] [1.2 Production method of laminate]

[0157] Hereinafter, an example of a production method of the laminate 10 according to the first embodiment of the present disclosure will be described.

[0158] First, a thermosetting resin is applied as a thermal adhesive to one main surface of the substrate 11 to form the adhesive layer 12. Next, after the intermediate layer 13 is placed on the adhesive layer 12, the recording medium 20 is mounted in the accommodation portion 13A of the intermediate layer 13. Note that the intermediate layer 13 in which the recording medium 20 is pre-mounted in the accommodation portion 13A can be placed on the adhesive layer 12. Further, the adhesive layer 12 can be formed by applying a thermosetting resin to the intermediate layer 13 in which the recording medium 20 is pre-mounted in the accommodation portion 13A, and then placing the intermediate layer 13 on the main surface of the substrate 11 with a coating film interposed therebetween. Alternatively, the adhesive layer 12 can be formed by adhering a sheet (which is pre-formed, for example, by applying a thermosetting resin to a separator) to the main surface of the substrate 11 or the intermediate layer 13 in which the recording medium 20 is pre-mounted in the accommodation portion 13A by means of thermal lamination or the like.

[0159] Next, a thermosetting resin is applied as a thermal adhesive to the intermediate layer 13 to form the adhesive layer 14, and then the cover layer 15 is placed on the adhesive layer 14. Next, the resulting laminate is clamped between metal plates and pressed while being heated, thereby thermally curing the adhesive layer 12 and the adhesive layer 14. From the viewpoint of reducing damage to the recording medium, the temperature applied to the laminate at the time of thermal curing is preferably 100°C to 120°C. As a result, the intended laminate 10 is obtained. The adhesive layer 14 can be formed by applying a thermosetting resin to the cover layer 15, and then placing the cover layer 15 on the intermediate layer 13 with a coating film interposed therebetween. Alternatively, the adhesive layer 14 can be formed by adhering a sheet (which is pre-formed, for example, by applying a thermosetting resin to a separator) to the cover layer 15 or the intermediate layer 13 by means of thermal lamination or the like.

[0160] [1.3 Recording method of the laminate]

[0161] In the laminate 10 according to the first embodiment, for example, a pattern or the like can be recorded on the recording medium 20 as follows. Here, a case where the color developing layers 24, 27, and 30 respectively exhibit cyan, magenta, and yellow will be described as an example.

[0162] For example, the recording medium 20 is irradiated with infrared rays having a prescribed wavelength and a prescribed output from a semiconductor laser or the like via the cover layer 15. Here, in the case of developing the color developing layer 24, infrared rays having a wavelength of λ1 are applied to the color developing layer 24 to the extent that the color developing layer 24 reaches a color developing temperature. Thus, the photothermal conversion material contained in the color developing layer 24 generates heat to cause a color reaction (color developing reaction) between the coloring compound and the color developing agent, and thus cyan is formed in the irradiated portion. Similarly, in the case of developing the color developing layer 27, infrared rays having a wavelength of λ2 are applied to the color developing layer 27 to the extent that the color developing layer 27 reaches a color developing temperature. In the case of developing the color developing layer 30, infrared rays having a wavelength of λ3 are applied to the color developing layer 30 to the extent that the color developing layer 30 reaches a color developing temperature. As a result, the photothermal conversion materials contained in the color developing layer 27 and the color developing layer 30 respectively generate heat to cause a color reaction between the coloring compound and the color developing agent, and thus magenta and yellow are respectively developed in the irradiated portions. In this way, a pattern or the like (for example, a full-color pattern or the like) can be recorded by irradiating randomly selected portions with infrared rays having corresponding wavelengths.

[0163] [1.4 Action and effect]

[0164] As described above, in the laminate 10 according to the first embodiment, the substrate 11 and the intermediate layer 13 are adhered to each other by the adhesive layer 12 containing a thermal adhesive, and the intermediate layer 13 and the cover layer 15 are adhered to each other by the adhesive layer 14 containing a thermal adhesive. As a result, the substrate 11 and the intermediate layer 13, and the intermediate layer 13 and the cover layer 15 can be firmly adhered to each other. Thus, the anti-counterfeiting performance of the laminate 10 can be improved. Further, the anti-tampering performance of the laminate 10 can be improved. Thus, the security of the laminate 10 can be improved.

[0165] Since the recording medium 20 includes the color developing layers 24, 27, and 30, a plastic security card or the like using a full-color photographic image made of the laminate 10 can be obtained.

[0166] Since the laminate 10 includes the full-color recording medium 20 in a part of the plane of the laminate 10, the cost can be reduced as compared to the case where the full-color recording medium 20 is provided on the entire surface of the laminate 10.

[0167] Since the recording medium 20 is installed in the housing portion 13A of the intermediate layer 13, it is possible to visually recognize the boundary between the recording medium 20 and the intermediate layer 13 in the in-plane direction of the laminate 10. Therefore, it is difficult to determine the portion of the plane of the laminate 10 on which the recording medium 20 is disposed. Thus, the anti-forgery performance can be improved.

[0168] Since the recording medium 20 is sealed in the laminate 10, it is possible to reduce the influence of moisture on the recording medium 20.

[0169] Since the recording medium 20 includes the thermal insulation layers 23, 26, and 29, it is possible to make the thickness of the recording medium 20 equal to the thickness of the intermediate layer 13 by adjusting the thickness of the thermal insulation layers 23, 26, and 29. Thus, it is possible to suppress the formation of a physical step at the boundary between the recording medium 20 and the intermediate layer 13.

[0170] <2Second Embodiment>

[0171] [2.1 Configuration of Laminate]

[0172] Figure 4 is a cross-sectional view of a laminate 40 according to the second embodiment of the present disclosure. The laminate 40 differs from the laminate 10 according to the first embodiment in that the laminate 40 does not include the adhesive layer 12 or the adhesive layer 14, the substrate 11 and the intermediate layer 13 are bonded to each other by fusion, and the intermediate layer 13 and the cover layer 15 are bonded to each other by fusion.

[0173] In the second embodiment, the substrate 11, the intermediate layer 13, and the cover layer 15 preferably contain a thermoplastic resin as a plastic. Since the substrate 11, the intermediate layer 13, and the cover layer 15 contain a thermoplastic resin, it is possible to enhance the interlayer adhesion strength by fusion. From the viewpoint of reducing damage to the recording medium 20, the thermoplastic resin is preferably capable of thermally fusing the layers of the laminate 40 in a temperature range of 130°C to 200°C.

[0174] The substrate 11, the intermediate layer 13, and the cover layer 15 can contain the same type of thermoplastic resin, or the substrate 11, the intermediate layer 13, and the cover layer 15 do not necessarily contain the same type of thermoplastic resin. In the case where the substrate 11, the intermediate layer 13, and the cover layer 15 do not contain the same type of thermoplastic resin, one of the substrate 11, the intermediate layer 13, and the cover layer 15 can contain a thermoplastic resin different from the other two, or the substrate 11, the intermediate layer 13, and the cover layer 15 can all contain different types of thermoplastic resin.

[0175] In the case where the substrate 11, the intermediate layer 13, and the cover layer 15 contain the same type of thermoplastic resin, the substrate 11, the intermediate layer 13, and the cover layer 15 preferably contain at least one selected from the group consisting of semi-crystalline thermoplastic resins and amorphous thermoplastic resins from the viewpoint of improving the interlayer adhesion strength by melting.

[0176] The semi-crystalline thermoplastic resin includes, for example, at least one selected from the group consisting of polypropylene (PP), polyethylene (PE), polyacetal (POM), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), and the like.

[0177] The amorphous thermoplastic resin includes, for example, at least one selected from the group consisting of ABS resin, polycarbonate (PC), a high polymer alloy of ABS resin and PC (hereinafter referred to as "ABS / PC polymer alloy"), AS resin, polystyrene (PS), polymethyl methacrylate (PMMA), polyphenylene ether (PPO), polysulfone (PSU), polyvinyl chloride (PVC), polyether imide (PEI), polyether sulfone (PES), and the like.

[0178] In the case where the substrate 11, the intermediate layer 13, and the cover layer 15 do not contain the same type of thermoplastic resin, the substrate 11, the intermediate layer 13, and the cover layer 15 preferably contain the amorphous thermoplastic resin from the viewpoint of improving the interlayer adhesion strength by melting.

[0179] The combination of the amorphous thermoplastic resin contained in the two adjacent layers of the laminate 40 is preferably the following combination. In the case where one of the two adjacent layers of the laminate 40 contains the ABS resin, the other layer preferably contains at least one selected from the group consisting of ABS / PC polymer alloy, polycarbonate (PC), AS resin, polystyrene (PS), polymethyl methacrylate (PMMA), and polyvinyl chloride (PVC), and the like.

[0180] In the case where one of the two adjacent layers of the laminate 40 preferably contains the ABS / PC polymer alloy, the other layer preferably contains at least one selected from the group consisting of ABS resin, polycarbonate (PC), and polymethyl methacrylate (PMMA). In the case where one of the two adjacent layers of the laminate 40 contains the polycarbonate (PC), the other layer preferably contains at least one selected from the group consisting of ABS resin, ABS / PC polymer alloy, and polymethyl methacrylate (PMMA).

[0181] In a case where one of the two adjacent layers of the laminate 40 contains the AS resin, the other layer preferably contains at least one selected from the group consisting of an ABS resin, polystyrene (PS), polymethyl methacrylate (PMMA), and polyphenylene oxide (PPO). In a case where one of the two adjacent layers of the laminate 40 contains polystyrene (PS), the other layer preferably contains at least one selected from the group consisting of an AS resin and polyphenylene oxide (PPO).

[0182] In a case where one of the two adjacent layers of the laminate 40 contains polymethyl methacrylate (PMMA), the other layer preferably contains at least one selected from the group consisting of an ABS resin, an ABS / PC polymer alloy, an AS resin, and polyphenylene oxide (PPO). In a case where one of the two adjacent layers of the laminate 40 contains polyphenylene oxide (PPO), the other layer preferably contains at least one selected from the group consisting of a polycarbonate (PC), an AS resin, polystyrene (PS), and polymethyl methacrylate (PMMA).

[0183] In a case where one of the two adjacent layers of the laminate 40 contains polysulfone (PSU), the other layer preferably contains a polycarbonate (PC). In a case where one of the two adjacent layers of the laminate 40 contains polyvinyl chloride (PVC), the other layer preferably contains an ABS resin.

[0184] [2.2 Production method of laminate]

[0185] Hereinafter, an example of a production method of the laminate 10 according to the second embodiment of the present disclosure will be described.

[0186] First, the intermediate layer 13 is placed on one main surface of the base material 11, and then the recording medium 20 is installed in the accommodation portion 13A of the intermediate layer 13. Note that the intermediate layer 13 in which the recording medium 20 is installed in the accommodation portion 13A in advance can be placed on one main surface of the base material 11. Next, the cover layer 15 is placed on the intermediate layer 13. Next, the obtained laminate is sandwiched between metal plates and is pressed while being heated, thereby heat-fusing the base material 11 and the intermediate layer 13 and heat-fusing the intermediate layer 13 and the cover layer 15. The temperature applied to the laminate at the time of heat-fusing is preferably 130°C to 200°C from the viewpoint of reducing damage to the recording medium 20 and exhibiting sufficient fusion strength. As a result, the intended laminate 40 is obtained.

[0187] [2.3 Effects and advantages]

[0188] As described above, in the laminate 40 according to the second embodiment, the substrate 11 and the intermediate layer 13 and the intermediate layer 13 and the cover layer 15 are respectively fused. As a result, the substrate 11 and the intermediate layer 13, and the intermediate layer 13 and the cover layer 15 can be firmly adhered to each other. Therefore, the anti-tampering performance of the laminate 40 can be improved. Further, the anti-counterfeiting performance of the laminate 40 can be improved. Thus, the security of the laminate 40 can be improved.

[0189] <3 Third Embodiment>

[0190] [3.1 Configuration of Laminate]

[0191] Figure 13 is a perspective view of a laminate 10A according to a third embodiment of the present disclosure. Figure 14 is a cross-sectional view along the XIV-XIV line of Figure 13 . The laminate 10A includes a substrate 11, an adhesive layer 12, an intermediate layer 16, an adhesive layer 14, a cover layer 15, and a recording medium 20A. Note that, in the third embodiment, portions similar to those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0192] (intermediate layer)

[0193] The intermediate layer 16 can protect the side surface of the recording medium 20A. The intermediate layer 16 surrounds the outer peripheral edge portion of one major surface of the substrate 11. The intermediate layer 16 has a frame shape in a plan view. In the present specification, the outer peripheral edge portion of one major surface refers to a region having a predetermined width from the outer peripheral edge of one major surface inward. Further, in the present specification, the plan view refers to a plan view when an object is observed from a direction perpendicular to one major surface of the substrate 11.

[0194] The intermediate layer 16 has an accommodation portion 16A. The recording medium 20A is accommodated in the accommodation portion 16A. The accommodation portion 16A is a through-hole that penetrates in the thickness direction of the recording medium 20A. The intermediate layer 16 and the recording medium 20A preferably have substantially the same thickness. As a result, in a state in which the recording medium 20A is in the accommodation portion 16A, the formation of a step at the boundary between the intermediate layer 16 and the recording medium 20A can be suppressed.

[0195] The intermediate layer 16 has a thin film shape. The intermediate layer 16 can have transparency. The intermediate layer 16 contains a plastic. As for the plastic, the same material as the substrate 11 can be referred to.

[0196] (recording medium 20A)

[0197] Figure 15A cross-sectional view of the recording medium 20A. The recording medium 20A includes, in order, the substrate 21, the pressure-sensitive adhesive layer 22, the color developing layer 24, the intermediate layer 35A, the color developing layer 27, the intermediate layer 35B, the color developing layer 30, the intermediate layer 35C, and the protective layer 36. More specifically, the recording medium 20A includes, in order, the substrate 21, the pressure-sensitive adhesive layer 22, the color developing layer 24, the heat insulation layer 26, the pressure-sensitive adhesive layer 25, the color developing layer 27, the heat insulation layer 29, the pressure-sensitive adhesive layer 28, the color developing layer 30, the heat insulation layer 34, the pressure-sensitive adhesive layer 33, and the protective layer 36. The heat insulation layers 26, 29, and 34 are provided as needed, and thus are not necessarily provided. The recording medium 20A is housed in the housing portion 16A of the intermediate layer 16 so that the substrate 21 is on the side of the adhesive layer 12 and the protective layer 36 is on the side of the adhesive layer 14.

[0198] (intermediate layer)

[0199] The intermediate layer 35A is similar to the intermediate layer 32B of the recording medium 20, except that the heat insulation layer 26 is adjacent to the color developing layer 24 and the pressure-sensitive adhesive layer 25 is adjacent to the color developing layer 27. The intermediate layer 35B is similar to the intermediate layer 32C of the recording medium 20, except that the heat insulation layer 29 is adjacent to the color developing layer 27 and the pressure-sensitive adhesive layer 28 is adjacent to the color developing layer 30. The intermediate layer 35C is similar to the intermediate layer 32D of the recording medium 20, except that the heat insulation layer 34 is adjacent to the color developing layer 30 and the pressure-sensitive adhesive layer 33 is adjacent to the protective layer 36.

[0200] (protective layer 36)

[0201] The protective layer 36 includes, in order, an ultraviolet-cured resin layer 36A, a UV cutoff layer 36B, a pressure-sensitive adhesive layer 36C, and a substrate 36D on one main surface of the intermediate layer 35C. The ultraviolet-cured resin layer 36A can protect the surface of the recording medium 20A. The ultraviolet-cured resin layer 36A can have a function as a heat insulation layer and / or an anti-diffusion layer. The UV cutoff layer 36B can cut off ultraviolet rays incident on the color developing layers 24, 27, and 30.

[0202] The pressure-sensitive adhesive layer 36C can adhere the UV cutoff layer 36B and the substrate 36D to each other.

[0203] As for the material of the pressure-sensitive adhesive layer 36C, reference can be made to the similar material to the pressure-sensitive adhesive layers 22, 25, and 28. The substrate 36D can support the ultraviolet-cured resin layer 36A, the UV cutoff layer 36B, and the pressure-sensitive adhesive layer 36C. The substrate 36D can protect the surface of the recording medium 20A. As for the material of the substrate 36D, for example, reference can be made to the similar material to the substrate 11.

[0204] [3.2 Effects and advantages]

[0205] The laminate 10A according to the third embodiment can provide similar effects and advantages to the laminate 10 according to the first embodiment.

[0206] <4Fourth Embodiment>

[0207] [4.1 Configuration of Laminates]

[0208] Figure 16 is a cross-sectional view of a laminate 40A according to a fourth embodiment of the present disclosure. The laminate 40A differs from the laminate 40 according to the second embodiment in that the laminate 40A includes an intermediate layer 16 and a recording medium 20A, instead of the intermediate layer 13 and the recording medium 20 (refer to Figure 4 ). The intermediate layer 16 and the recording medium 20A are as described in the third embodiment.

[0209] [4.2 Effects and Advantages]

[0210] The laminate 40A according to the fourth embodiment can provide similar effects and advantages to the laminate 40 according to the second embodiment.

[0211] <5Modification>

[0212] (Modification 1)

[0213] In the first embodiment, an example has been described in which the accommodation portion 13A is a through-hole that penetrates in the thickness direction of the intermediate layer 13. However, as shown in Figure 5 , the accommodation portion 13A can be a recess that is recessed in the thickness direction of the intermediate layer 13. In this case, the recess can be provided on the main surface of the two main surfaces of the intermediate layer 13 that faces the cover layer 15, or can be provided on the main surface that faces the substrate 11. Similarly, in the second embodiment, a recess can be provided as the accommodation portion 13A instead of the through-hole. Similarly, as shown in Figure 17 , a recess can be provided as the accommodation portion 16A instead of the through-hole in the third embodiment. Similarly, in the fourth embodiment, a recess can be provided as the accommodation portion 17A instead of the through-hole.

[0214] (Modification 2)

[0215] In the first, second, third, and fourth embodiments, an example has been described in which each of the laminates 10, 40, 10A, and 40A includes a recording medium 20 or 20A that includes three color developing layers (color developing layers 24, 27, and 30) that display colors of different shades from each other, but these laminates can include a recording medium that contains a color developing layer capable of performing multi-color display in a single layer structure.

[0216] Figure 6is a cross-sectional view of a recording medium 50 that enables multicolor display even in a single-layer structure. The recording medium 50 includes, in order, a substrate 51, a color developing layer 52, and a protective layer 53. The substrate 51 and the protective layer 53 are similar to the substrate 21 and the protective layer 31 in the first embodiment, respectively.

[0217] The color developing layer 52 includes three types of microcapsules 52C, 52M, and 52Y that display colors of different color tones from each other. That is, the color developing layer 52 includes three types of microcapsules 52C, 52M, and 52Y that exhibit different colors in a color developed state. The color developing layer 52 can contain a first matrix polymer as necessary. Each of the three types of microcapsules 52C, 52M, and 52Y contains, for example, a coloring compound (e.g., cyan (C), magenta (M), and yellow (Y)) that exhibits a different color; a color developing agent corresponding to each coloring compound; a light-heat conversion material that can absorb light in a different wavelength range and generate heat; and a second matrix polymer. As a material of a microcapsule wall containing the above-described materials, for example, a material similar to the material that constitutes the heat insulation layers 23, 26, and 29 is preferably used.

[0218] (Modified Example 3)

[0219] In the first, second, third, and fourth embodiments, an example in which each of the recording media 20 and 20A includes three color developing layers (the color developing layers 24, 27, and 30) is described, but the recording media 20 and 20A can include a single color developing layer. In this case, the recording media 20 and 20A can include, in order, a substrate, a pressure-sensitive adhesive layer, a color developing layer, and a protective layer. The color developing layer can exhibit black in a color developed state.

[0220] Further, the recording media 20 and 20A can include a first color developing layer to an n-th color developing layer (here, n is an integer of 2 or more). In this case, the first color developing layer to the n-th color developing layer can contain coloring compounds that display colors of different color tones from each other.

[0221] (Modified Example 4)

[0222] In the first and second embodiments, the intermediate layer 13 can include a recording medium that can be rewritten by external excitation such as laser light or heat, or the like. More specifically, the intermediate layer 13 can include a recording medium that can reversibly change a coloring state by external excitation such as laser light or heat. The recording medium can have a configuration capable of performing full-color recording, or can be able to record a single color, such as black and white.

[0223] (Modified Example 5)

[0224] In the first, second, third, and fourth embodiments, the color developing agent can contain a compound represented by the following formula (3):

[0225] [Chemical Formula 3]

[0226]

[0227] (wherein X 0 is a divalent group including at least one benzene ring, Y 01 and Y 02 are each independently a monovalent group, n01 and n02 are each independently an integer of 0 to 5, in the case where n01 is an integer of 2 to 5, Y 01 may be the same or different from each other, in the case where n02 is an integer of 2 to 5, Y 02 may be the same or different from each other, and Z 01 and Z 02 are each independently a hydrogen bonding group.)

[0228] When X 0 includes at least one benzene ring, the melting point can be increased as compared to the case where X 0 is an aliphatic group (e.g., a normal alkyl chain), and thus the color development retention property upon high-temperature high-humidity storage (hereinafter referred to as "high-temperature high-humidity storage property") can be improved. From the viewpoint of improving the high-temperature high-humidity storage property and heat resistance, X 0 preferably includes at least two benzene rings. The high-temperature high-humidity storage property is, for example, a storage property in an environment of 80°C and 60% RH. When the heat resistance is improved, the recording medium 20 is improved in resistance to harsh processes (e.g., heat press, and integral molding using a molten resin or the like). In the case where X 0 includes at least two benzene rings, the at least two benzene rings can be condensed. For example, the condensed benzene rings can be naphthalene or anthracene, or the like.

[0229] Since Z 01 and Z 02 are each independently a hydrogen bonding group, the color developer is likely to be in a state of aggregation to some extent through hydrogen bonding, and thus the stability of the color developer in the color development layers 24, 27, and 30 is improved. In the present specification, the hydrogen bonding group refers to a functional group including a functional group that can be bonded to an atom present in another functional group, another compound, or the like through hydrogen bonding.

[0230] The color developer preferably contains a compound represented by the following formula (4):

[0231] [Chemical Formula 4]

[0232]

[0233] (wherein X 1 is a divalent group including at least one benzene ring, Y 11 , Y 12 , Y 13 and Y14 Each is an independent monovalent group, Z 11 and Z 12 Each group is an independent hydrogen-bonded group.

[0234] When X 1 When it contains at least one benzene ring, with X 1 Compared to cases where the group is an aliphatic hydrocarbon (e.g., a n-alkyl chain), the melting point can be increased, thereby improving storage characteristics under high temperature and high humidity conditions. From the viewpoint of improving storage characteristics under high temperature and high humidity conditions and heat resistance, X 1 Preferably, it includes at least two benzene rings. In X 1 In cases involving at least two benzene rings, these two benzene rings can condense. For example, the condensed benzene rings can be naphthalene or anthracene, etc.

[0235] Due to Z 11 and Z 12 Each is an independent hydrogen-bonded group, and the color developer is likely in a state of aggregation through hydrogen bonds to some extent, thereby improving the stability of the color developer in color layers 24, 27 and 30.

[0236] In the cases where formulas (3) and (4) include hydrocarbon groups, hydrocarbon groups are a general term for groups that include carbon (C) and hydrogen (H), and can be saturated hydrocarbon groups or unsaturated hydrocarbon groups. Saturated hydrocarbon groups are aliphatic hydrocarbon groups without carbon-carbon multiple bonds, while unsaturated hydrocarbon groups are aliphatic hydrocarbon groups with carbon-carbon multiple bonds (carbon-carbon double bonds or carbon-carbon triple bonds).

[0237] In the cases where formulas (3) and (4) include a hydrocarbon group, the hydrocarbon group may be chain-like or may contain one or two or more rings. The chain may be a linear chain or a branched chain with one or more side chains, etc.

[0238] (X 0 X 1 (Including a benzene ring)

[0239] For example, X in equation (3) 0 In equation (4) X 1 It is a divalent group that includes a benzene ring. A divalent group is represented, for example, by the following formula (5):

[0240] [Chemical Formula 5]

[0241]

[0242] (where X) 21 It may or may not exist in X 21 If X exists, 21 It is a divalent group, X 22 It may or may not exist in X 22X is a divalent group in the presence of 22 R is a monovalent group, n 21 is an integer of 0 to 4, and in the case where n 21 is an integer of 2 to 4, R 21 may be the same or different from each other, and the symbol "*" represents a bonding site. 21

[0243] In formula (5), X 21 and X 22 are not limited in the bonding position to the benzene ring. That is, X 21 and X 22 may be any one of the ortho position, the meta position, and the para position in the bonding position to the benzene ring.

[0244] From the viewpoint of improving the high-temperature high-humidity storage characteristics, the divalent group including one benzene ring is preferably represented by the following formula (6):

[0245] [Chemical Formula 6]

[0246]

[0247] (wherein R 22 is a monovalent group, n 22 is an integer of 0 to 4, and in the case where n 22 is an integer of 2 to 4, a plurality of R 22 may be the same or different from each other, and the symbol "*" represents a bonding site.

[0248] In the case where X 0 in formula (3) is a divalent group including one benzene ring, Z 01 and Z 02 are not limited in the bonding position to the benzene ring in formula (6). That is, Z 01 and Z 02 may be any one of the ortho position, the meta position, and the para position in the bonding position to the benzene ring.

[0249] In the case where X 1 in formula (4) is a divalent group including one benzene ring, Z 11 and Z 12 are not limited in the bonding position to the benzene ring in formula (6). That is, Z 11 and Z 12 may be any one of the ortho position, the meta position, and the para position in the bonding position to the benzene ring.

[0250] (X 21 , X 22 )

[0251] In formula (5), X 21 and X 22 ​Each of R1to R4in the formula (5) can be independently a divalent group, and is not particularly limited, but exemplified as a hydrocarbon group optionally having a substituent. The hydrocarbon group is preferably a chain hydrocarbon group. When the hydrocarbon group is a chain hydrocarbon group, the melting point of the color developer can be lowered, so that the color developer is dissolved by laser irradiation, and the coloring compound is easily colored. From the viewpoint of lowering the melting point of the color developer, in the chain hydrocarbon group, a n-alkyl chain is particularly preferred.

[0252] The number of carbon atoms of the hydrocarbon group optionally having a substituent is, for example, 1 or more and 15 or less, 1 or more and 13 or less, 1 or more and 12 or less, 1 or more and 10 or less, 1 or more and 6 or less, or 1 or more and 3 or less.

[0253] X in the formula (5) 21 and X 22 is a n-alkyl group, the number of carbon atoms of the n-alkyl group is preferably 8 or less, more preferably 6 or less, and still more preferably 5 or less, and particularly from the viewpoint of high-temperature storage stability, 3 or less is particularly preferred. It is considered that in the case where the number of carbon atoms of the n-alkyl group is 8 or less, the length of the n-alkyl group is short, and thus thermal interference is less likely to occur in the color developer during high-temperature storage, and the site that interacts with the coloring compound (for example, a leuco dye) at the time of color development is less likely to be removed. Thus, the coloring compound such as the leuco dye is hardly decolorized during high-temperature storage, and thus the high-temperature storage stability is improved.

[0254] Examples of the substituent optionally included in the hydrocarbon group include a halogen group (for example, a fluorine group) or an alkyl group having a halogen group (for example, a fluorine group), and the like. The hydrocarbon group optionally having a substituent can be a hydrocarbon group in which a part of the carbons of the hydrocarbon group (for example, a part of the carbons included in the main chain of the hydrocarbon group) is substituted with an element such as oxygen.

[0255] (R 21 )

[0256] R in the formula (5) 21 is not particularly limited as long as it is a monovalent group, and is, for example, a halogen group or a hydrocarbon group optionally having a substituent.

[0257] For example, the halogen group is a fluorine group (-F), a chlorine group (-Cl), a bromine group (-Br), or an iodine group (-I).

[0258] The number of carbon atoms of the hydrocarbon group optionally having a substituent is, for example, 1 or more and 15 or less, 1 or more and 13 or less, 1 or more and 12 or less, 1 or more and 10 or less, 1 or more and 6 or less, or 1 or more and 3 or less.

[0259] Examples of the substituent optionally included in the hydrocarbyl group include a halogen group (e.g., a fluorine group) or an alkyl group having a halogen group (e.g., a fluorine group), etc. The hydrocarbyl group optionally having a substituent can be a hydrocarbyl group in which a part of carbon of the hydrocarbyl group (e.g., a part of carbon included in the main chain of the hydrocarbyl group) is substituted with an element such as oxygen.

[0260] (R 22 )

[0261] R 22 is not particularly limited as long as it is a monovalent group, and is, for example, a halogen group or a hydrocarbyl group optionally having a substituent. The halogen group and the hydrocarbyl group optionally having a substituent are each similar to R 21 in the formula (3) described above.

[0262] (X 0 , X 1 comprises two benzene rings

[0263] X 0 in the formula (3) and X 1 in the formula (4) are divalent groups comprising two benzene rings. For example, the divalent group is represented by the following formula (7):

[0264] [Chemical Formula 7]

[0265]

[0266] (X 31 may or can not be present, and in the case where X 31 is present, X 31 is a divalent group, X 32 may or can not be present, and in the case where X 32 is present, X 32 is a divalent group, X 33 may or can not be present, and in the case where X 33 is present, X 33 is a divalent group, R 31 and R 32 are each independently a monovalent group, n 31 and n 32 are each independently an integer of 0 to 4, in the case where n 31 is an integer of 2 to 4, a plurality of R 31 may be the same or different from each other, in the case where n 32 is an integer of 2 to 4, a plurality of R 32 may be the same or different from each other, and the symbol “*” represents a bonding portion.

[0267] In the formula (7), X 31 and X 32The bonding position to the benzene ring is not limited. That is, X 31 and X 32 The bonding position to the benzene ring can be any one of the ortho position, the meta position and the para position. Similarly, in formula (7), X 32 and X 33 The bonding position to the benzene ring is not limited. That is, X 32 and X 33 The bonding position to the benzene ring can be any one of the ortho position, the meta position and the para position.

[0268] From the viewpoint of improving the high-temperature high-humidity storage characteristics, the divalent group including two benzene rings is preferably represented by the following formula (8):

[0269] [Chemical Formula 8]

[0270]

[0271] (wherein X 34 is a divalent group, R 33 and R 34 each independently is a monovalent group, n 33 and n 34 each independently is an integer of 0 to 4, in the case where n 33 is an integer of 2 to 4, R 33 may be the same or different from each other, in the case where n 34 is an integer of 2 to 4, a plurality of R 34 may be the same or different from each other, and the symbol "*" represents a bonding portion.)

[0272] In the case where X 0 in formula (3) is a divalent group including two benzene rings, Z 01 and X 34 The bonding position to the benzene ring in formula (8) is not limited. That is, Z 01 and X 34 The bonding position to the benzene ring can be any one of the ortho position, the meta position and the para position. Similarly, in formula (8), Z 02 and X 34 The bonding position to the benzene ring is not limited. That is, Z 02 and X 34 The bonding position to the benzene ring can be any one of the ortho position, the meta position and the para position.

[0273] In the case where X 1 in formula (4) is a divalent group including two benzene rings, Z 11 and X 34 The bonding position to the benzene ring in formula (8) is not limited. That is, Z 11 and X 34The bonding position to the benzene ring can be any one of the ortho position, the meta position, and the para position. Similarly, in formula (8), Z 12 and X 34 The bonding position to the benzene ring is not limited. That is, Z 12 and X 34 The bonding position to the benzene ring can be any one of the ortho position, the meta position, and the para position.

[0274] (X 31 , X 32 , X 33 )

[0275] X 31 , X 32 , and X 33 in formula (7) can each independently be a divalent group, and is not particularly limited, but is, for example, a hydrocarbon group optionally having a substituent. The hydrocarbon group is similar to X 21 and X 22 in formula (5) described above.

[0276] (X 34 )

[0277] X 34 in formula (8) is not particularly limited as long as it is a divalent group, but is, for example, a hydrocarbon group optionally having a substituent. The hydrocarbon group is similar to X 21 and X 22 in formula (5) described above.

[0278] (R 31 , R 32 )

[0279] R 31 and R 32 in formula (7) are not particularly limited as long as they are monovalent groups, and are, for example, a halogen group or a hydrocarbon group optionally having a substituent. The halogen group and the hydrocarbon group optionally having a substituent are each similar to R 21 in formula (5) described above.

[0280] (R 33 , R 34 )

[0281] R 33 and R 34 in formula (8) are not particularly limited as long as they are monovalent groups, and are, for example, a halogen group or a hydrocarbon group optionally having a substituent. The halogen group and the hydrocarbon group optionally having a substituent are each similar to R 21 in formula (5) described above.

[0282] (Y 01 , Y 02 )

[0283] Y in equation (3) 01 and Y 02 Each can be, independently, a hydrogen group (-H), a hydroxyl group (-OH), a halogen group (-X), a carboxyl group (-COOH), an ester group (-COOR), or optionally a hydrocarbon group having substituents.

[0284] For example, the halogen group is fluorine (-F), chlorine (-Cl), bromine (-Br), or iodine (-I).

[0285] Optionally, the number of carbon atoms in the hydrocarbon group having the substituent is, for example, 1 to 15, 1 to 13, 1 to 12, 1 to 10, 1 to 6, or 1 to 3.

[0286] Examples of substituents optionally included in the hydrocarbon group include halogen groups (e.g., fluorine groups) or alkyl groups having halogen groups (e.g., fluorine groups). Optionally, a hydrocarbon group having substituents can be a hydrocarbon group in which a portion of the carbon atoms (e.g., a portion of the carbon atoms contained in the main chain of the hydrocarbon group) are replaced by an element such as oxygen.

[0287] In equation (3), (Y 01 ) n01 and / or (Y) 02 ) n02 One of them is preferably a hydroxyl group (-OH). When (Y) 01 ) n01 and / or (Y) 02 ) n02 One of the advantages is that the presence of hydroxyl groups (-OH) can improve display quality and lightfastness.

[0288] (Y 11 Y 12 Y 13 Y 14 )

[0289] In equation (4), Y 11 and Y 12 The bonding position with the benzene ring is unrestricted. That is to say, Y 11 and Y 12 The bonding position with the benzene ring can be any one of the ortho, meta, and para positions. Similarly, in equation (4), Y 13 and Y 14 There are no restrictions on the bonding position with the benzene ring. That is to say, Y 13 and Y 14 The bonding position with the benzene ring can be any one of the ortho, meta, and para positions. In equation (4), Y 11 and Y 12 The bonding position with a benzene group and Y13 and Y 14 The bonding positions to the other benzene can be the same or different.

[0290] Y in formula (4) 11 , Y 12 , Y 13 and Y 14 Each of Y 01 and Y 02 is, for example, a hydrogen group (-H), a hydroxyl group (-OH), a halogen group, a carboxyl group (-COOH), an ester group (-COOR), or a hydrocarbon group optionally having a substituent. The halogen group and the hydrocarbon group optionally having a substituent are similar to Y 11 and Y 13 in formula (3) described above.

[0291] In formula (4), Y 11 and / or Y 13 is preferably a hydroxyl group (-OH). When Y 01 and / or Y 02 is a hydroxyl group (-OH), display quality and light resistance can be improved.

[0292] (Z 01 , Z 02 )

[0293] Z in formula (3) 01 and Z 02 are each independently, for example, a urea bond (-NHCONH-), an amide bond (-NHCO-, -OCHN-), or a hydrazide bond (-NHCOCONH-). Z 01 and Z 02 are preferably a urea bond. In the case where Z 11 is an amide bond, a nitrogen contained in the amide bond can be bonded to the benzene, or a carbon contained in the amide bond can be bonded to the benzene. In the case where Z 12 is an amide bond, a nitrogen contained in the amide bond can be bonded to the benzene, or a carbon contained in the amide bond can be bonded to the benzene.

[0294] (Z 11 , Z 12 )

[0295] Z in formula (4) 11 and Z 12 are each independently, for example, a urea bond (-NHCONH-), an amide bond (-NHCO-, -OCHN-), or a hydrazide bond (-NHCOCONH-). Z 11In the case of an amide bond, the nitrogen contained in the amide bond can be bonded to the benzene, or the carbon contained in the amide bond can be bonded to the benzene. In Z 12 In the case of an amide bond, the nitrogen contained in the amide bond can be bonded to the benzene, or the carbon contained in the amide bond can be bonded to the benzene.

[0296] (Specific examples of color developers)

[0297] Specifically, X in formula (3) 0 and X in formula (4) 1 The color developer including one benzene ring contains at least one selected from the group consisting of, for example, compounds represented by the following formulae (9-1) to (9-6).

[0298] [Chemical formula 9]

[0299]

[0300] Specifically, X in formula (3) 0 and X in formula (4) 1 The color developer including two benzene rings contains at least one selected from the group consisting of, for example, compounds represented by the following formulae (10-1) to (10-8).

[0301] [Chemical formula 10]

[0302]

[0303] (Modification example 6)

[0304] In the first embodiment, an example in which the laminate 10 includes the recording medium 20 is described (see Figure 3 ), but the laminate 10 can include Figure 18 the recording medium 20B shown in FIG. 10 in place of the recording medium 20. The recording medium 20B differs from the recording medium 20 in that the recording medium 20B includes a protective layer 36 in place of the protective layer 31. The protective layer 36 is as described in the third embodiment. Similarly, in the second embodiment, the laminate 40 can include Figure 18 the recording medium 20B shown in FIG. 10 in place of the recording medium 20.

[0305] (Modification example 7)

[0306] In the third embodiment, an example in which the laminate 10A includes the recording medium 20A is described, but the laminate 10A can include Figure 19 the recording medium 20C shown in FIG. 11 in place of the recording medium 20A (see Figure 15). The recording medium 20C differs from the recording medium 20A in that the recording medium 20C includes the intermediate layers 37A, 37B, and 37C in place of the intermediate layers 35A, 35B, and 35C. The recording medium 20C need not include the substrate 21 and the pressure-sensitive adhesive layer 22.

[0307] The intermediate layer 37A includes, in order, the thermal barrier layer 26A and the pressure-sensitive adhesive layer 25 on one major surface of the color developing layer 24. The thermal barrier layer 26A includes, in order, the resin layer 26A1 and the ultraviolet-cured resin layer 26A2 on one major surface of the color developing layer 24. The resin layer 26A1 is disposed between the color developing layer 24 and the ultraviolet-cured resin layer 26A2. The resin layer 26A1 can improve the adhesion between the color developing layer 24 and the ultraviolet-cured resin layer 26A2. The resin layer 26A1 contains a resin material of the same type as the matrix polymer contained in the color developing layer 24. For example, in the case where the color developing layer 24 contains a polycarbonate-based resin as the matrix polymer, the resin layer 26A1 contains a polycarbonate-based resin. The ultraviolet-cured resin layer 26A2 is similar to the ultraviolet-cured resin layer of the thermal barrier layer 26 in the third embodiment.

[0308] The intermediate layer 37B includes, in order, the thermal barrier layer 29A and the pressure-sensitive adhesive layer 28 on one major surface of the color developing layer 27. The thermal barrier layer 29A includes, in order, the resin layer 29A1 and the ultraviolet-cured resin layer 29A2 on one major surface of the color developing layer 27. The resin layer 29A1 is disposed between the color developing layer 27 and the ultraviolet-cured resin layer 29A2. The resin layer 29A1 can improve the adhesion between the color developing layer 27 and the ultraviolet-cured resin layer 29A2. The resin layer 29A1 contains a resin material of the same type as the matrix polymer contained in the color developing layer 27. For example, in the case where the color developing layer 27 contains a polycarbonate-based resin as the matrix polymer, the resin layer 29A1 contains a polycarbonate-based resin. The ultraviolet-cured resin layer 29A2 is similar to the ultraviolet-cured resin layer of the thermal barrier layer 29 in the third embodiment.

[0309] The intermediate layer 37C includes, in order, the thermal barrier layer 34A and the pressure-sensitive adhesive layer 33 on one major surface of the color developing layer 30.

[0310] The thermal barrier layer 34A includes, in order, the resin layer 34A1 and the ultraviolet-cured resin layer 34A2 on one major surface of the color developing layer 30. The resin layer 34A1 is disposed between the color developing layer 30 and the ultraviolet-cured resin layer 34A2. The resin layer 34A1 can improve the adhesion between the color developing layer 30 and the ultraviolet-cured resin layer 34A2. The resin layer 34A1 contains a resin material of the same type as the matrix polymer contained in the color developing layer 30. For example, in the case where the color developing layer 30 contains a polycarbonate-based resin as the matrix polymer, the resin layer 34A1 contains a polycarbonate-based resin. The ultraviolet-cured resin layer 34A2 is similar to the thermal barrier layer of the ultraviolet-cured resin layer 34 in the third embodiment.

[0311] The reason for providing the resin layer 26A1 between the color developing layer 24 and the ultraviolet-cured resin layer 26A2 is as follows. In the case where the color developing layer 24 contains a particulate color developing agent, the particulate color developing agent is distributed on the surface of the color developing layer 24. Therefore, in the case where the color developing layer 24 and the ultraviolet-cured resin layer 26A2 are adjacent to each other, the adhesion can be reduced. As described above, since the resin layer 26A1 is adjacent to the color developing layer 24, and the resin layer 26A1 contains a resin material of the same type as the matrix polymer contained in the color developing layer 24, the adhesion at the interface except for the portion where the color developing agent is distributed can be improved. Therefore, the reduction in the adhesion due to the particulate color developing agent can be compensated for.

[0312] The reason for providing the resin layer 29A1 between the color developing layer 27 and the ultraviolet-cured resin layer 29A2, and the reason for providing the resin layer 34A1 between the color developing layer 30 and the ultraviolet-cured resin layer 34A2 are similar to the reason for providing the resin layer 26A1 between the color developing layer 24 and the ultraviolet-cured resin layer 26A2.

[0313] (Modified Example 8)

[0314] In the third embodiment, an example in which the laminate 10A includes the recording medium 20A is described, but the laminate 10A can include Figure 20 the recording medium 20D shown in FIG. 10 in place of the recording medium 20A (see FIG. 1). The recording medium 20D differs from the recording medium 20A in that the recording medium 20D includes the intermediate layers 38A, 38B, and 38C in place of the intermediate layers 35A, 35B, and 35C. Figure 15 The intermediate layer 38A includes, in order, the thermal barrier layer 26B and the pressure-sensitive adhesive layer 25 on one main surface of the color developing layer 24.

[0315] The thermal barrier layer 26B includes, in order, the pressure-sensitive adhesive layer 26B1 and the ultraviolet-cured resin layer 26B2 on one main surface of the color developing layer 24. The pressure-sensitive adhesive layer 26B1 is provided between the color developing layer 24 and the ultraviolet-cured resin layer 26B2. The pressure-sensitive adhesive layer 26B1 can adhere the color developing layer 24 and the ultraviolet-cured resin layer 26B2 to each other. Since the pressure-sensitive adhesive layer 26B1 is provided between the color developing layer 24 and the ultraviolet-cured resin layer 26B2, a reduction in the adhesion due to the developing agent contained in the color developing layer 24 can be compensated for. As a material of the pressure-sensitive adhesive layer 26B1, a material similar to the pressure-sensitive adhesive layers 22, 25, and 28 can be exemplified.

[0316] The intermediate layer 38B includes, in order, the thermal barrier layer 29B and the pressure-sensitive adhesive layer 28 on one main surface of the color developing layer 27.

[0317] The intermediate layer 38B includes, in order, the thermal barrier layer 29B and the pressure-sensitive adhesive layer 28 on one main surface of the color developing layer 27.

[0318] The thermal barrier layer 29B includes, in order, a pressure-sensitive adhesive layer 29B1 and an ultraviolet-cured resin layer 29B2 on one main surface of the color developing layer 27. The pressure-sensitive adhesive layer 29B1 is provided between the color developing layer 27 and the ultraviolet-cured resin layer 29B2. The pressure-sensitive adhesive layer 29B1 can adhere the color developing layer 27 and the ultraviolet-cured resin layer 29B2 to each other. Since the pressure-sensitive adhesive layer 29B1 is provided between the color developing layer 27 and the ultraviolet-cured resin layer 29B2, a decrease in adhesion due to a color developing agent contained in the color developing layer 27 can be compensated for. As a material of the pressure-sensitive adhesive layer 29B1, a material similar to the pressure-sensitive adhesive layers 22, 25, and 28 can be exemplified.

[0319] The intermediate layer 38C includes, in order, the thermal barrier layer 34B and a pressure-sensitive adhesive layer 33 on one main surface of the color developing layer 30.

[0320] The thermal barrier layer 34B includes, in order, a pressure-sensitive adhesive layer 34B1 and an ultraviolet-cured resin layer 34B2 on one main surface of the color developing layer 30. The pressure-sensitive adhesive layer 34B1 is provided between the color developing layer 30 and the ultraviolet-cured resin layer 34B2. The pressure-sensitive adhesive layer 34B1 can adhere the color developing layer 30 and the ultraviolet-cured resin layer 34B2 to each other. Since the pressure-sensitive adhesive layer 34B1 is provided between the color developing layer 30 and the ultraviolet-cured resin layer 34B2, a decrease in adhesion due to a color developing agent contained in the color developing layer 30 can be compensated for. As a material of the pressure-sensitive adhesive layer 34B1, a material similar to the pressure-sensitive adhesive layers 22, 25, and 28 can be exemplified.

[0321] (Modified Example 9)

[0322] In the third embodiment, an example in which the laminate 10A includes the recording medium 20A is described, but the laminate 10A can include Figure 21 the recording medium 20E shown instead of the recording medium 20A (see Figure 15 ). The recording medium 20E differs from the recording medium 20A in that the recording medium 20E includes the intermediate layers 39A, 39B, and 39C instead of the intermediate layers 35A, 35B, and 35C. The recording medium 20E does not necessarily include the substrate 21 and the pressure-sensitive adhesive layer 22.

[0323] The intermediate layers 39A and 39B are films. The films are preferably easily adherable-treated films. As a material of the films, a material similar to the substrate 11 can be exemplified. Examples of the easily adherable treatment include primer treatment, active energy ray irradiation treatment, plasma treatment, corona treatment, vapor deposition treatment, etching treatment, sandblasting treatment, and the like. One or a combination of two or more of these methods can be selected. The primer treatment can be primer treatment with a resin, a silane coupling agent, a tetraalkoxysilane, or the like.

[0324] Since the film subjected to the easy-adhesion treatment is provided as the intermediate layer 39A between the color developing layer 24 and the color developing layer 27, it is possible to compensate for the decrease in adhesion due to the color developing agent contained in the color developing layer 24. Since the film subjected to the easy-adhesion treatment is provided as the intermediate layer 39B between the color developing layer 27 and the color developing layer 30, it is possible to compensate for the decrease in adhesion due to the color developing agent contained in the color developing layer 27.

[0325] The intermediate layer 39C is a pressure-sensitive adhesive layer. As a material of the pressure-sensitive adhesive layer, a material similar to the pressure-sensitive adhesive layers 22, 25, and 28 can be exemplified. Since the pressure-sensitive adhesive layer is provided as the intermediate layer 39C between the color developing layer 30 and the protective layer 36, it is possible to compensate for the decrease in adhesion due to the color developing agent contained in the color developing layer 30.

[0326] (Modified Example 10)

[0327] In the third embodiment, an example in which the laminate 10A includes the recording medium 20A is described, but the laminate 10A can include the recording medium 20F shown in place of the recording medium 20A (see FIG. 12) instead of the recording medium 20A (see FIG. 11). Figure 22 The recording medium 20F is different from the recording medium 20E in the modified example 9 in that the recording medium 20F includes the intermediate layer 41B in place of the intermediate layer 39B. Figure 15

[0328] The intermediate layer 41B includes, in order, a resin layer 41B1 and a resin layer 41B2 on one main surface of the color developing layer 27. The resin layer 41B1 contains a resin material of the same type as the matrix polymer contained in the color developing layer 27. For example, in the case where the color developing layer 27 contains a polycarbonate-based resin as the matrix polymer, the resin layer 41B1 contains a polycarbonate-based resin. The resin layer 41B2 is a film. The film is preferably a thin film subjected to an easy-adhesion treatment. As a material of the thin film, a material similar to the base material 11 can be exemplified.

[0329] As described above, since the resin layer 41B1 is provided between the color developing layer 27 and the resin layer 41B2, it is possible to compensate for the decrease in adhesion due to the color developing agent contained in the color developing layer 27.

[0330] (Modified Example 11)

[0331] In the third embodiment, an example in which the laminate 10A includes the recording medium 20A is described, but the laminate 10A can include the recording medium 20G shown in place of the recording medium 20A (see FIG. 13) instead of the recording medium 20A (see FIG. 11). Figure 23 The recording medium 20G is different from the recording medium 20E in the modified example 9 in that the recording medium 20G includes the intermediate layer 41B in place of the intermediate layer 39B. Figure 15 ​). The recording medium 20G differs from the recording medium 20E in Modification Example 9 in that the recording medium 20G includes the intermediate layer 38A instead of the intermediate layer 39A, and includes the substrate 42.

[0332] The intermediate layer 38A is as described in Modification Example 8 (see Figure 20 ). The substrate 42 is provided adjacent to the other surface of the color developing layer 24. The substrate 42 is a film subjected to an easy-adhesion treatment. As a material of the film, a material similar to the substrate 11 can be exemplified.

[0333] (Modification Example 12)

[0334] In the third embodiment, an example in which the laminate 10A includes the recording medium 20A is described, but the laminate 10A can include Figure 24 the recording medium 20H instead of the recording medium 20A (see Figure 15 ). The recording medium 20H differs from the recording medium 20A in that the recording medium 20H includes the intermediate layers 42A and 42B instead of the intermediate layers 35A and 35B.

[0335] The intermediate layers 42A and 42B are pressure-sensitive adhesive layers. As a material of the pressure-sensitive adhesive layers, a material similar to the pressure-sensitive adhesive layers 22, 25, and 28 can be exemplified.

[0336] (Modification Example 13)

[0337] In the first and second embodiments, an example in which the laminate 10 includes the recording medium 20 is described, but the laminate 10 can include the recording medium 20A instead of the recording medium 20.

[0338] (Modification Example 14)

[0339] In the third and fourth embodiments, an example in which the laminate 10A includes the recording medium 20A is described, but the laminate 10A can include the recording medium 20 instead of the recording medium 20A.

[0340] (Modification Example 15)

[0341] In the above-described Modification Examples 7, 8, 9, 10, 11, and 12, in which it is described that the laminate 10A according to the third embodiment includes any one of the recording media 20C, 20D, 20E, 20F, 20G, and 20H in place of the recording medium 20A, the present disclosure is not limited thereto. For example, the laminate 10 according to the first embodiment can include any one of the recording media 20C, 20D, 20E, 20F, 20G, and 20H in place of the recording medium 20. The laminate 40 according to the second embodiment can include any one of the recording media 20C, 20D, 20E, 20F, 20G, and 20H in place of the recording medium 20. The laminate 40A according to the fourth embodiment can include any one of the recording media 20C, 20D, 20E, 20F, 20G, and 20H in place of the recording medium 20A.

[0342] (Modification Example 16)

[0343] In the first, second, third, and fourth embodiments and the modification examples thereof, examples in which the laminates 10, 40, 10A, and 40A are applied to cards are described, but the laminates 10, 40, 10A, and 40A can be applied to housings of medical supplies, automobile parts, automobiles, toys, foods, cosmetics, clothing, documents (e.g., passports, and the like), exterior components, electronic devices, and the like. Specific examples of the exterior components include the interior or exterior of a wall of a building or the like, the exterior of furniture such as a desk. Specific examples of the electronic devices include personal computers (hereinafter referred to as “PCs”), mobile devices, mobile phones (e.g., smartphones), tablet computers, display devices, imaging devices, audio devices, game devices, industrial devices, medical devices, robots, wearable terminals, and the like. Specific examples of the wearable terminals include clothing items such as watches (wristwatches), bags, clothes, hats, glasses, and shoes.

[0344] Hereinafter, specific examples in which the laminates 10, 40, 10A, and 40A are applied to smartphones, notebook computers, and decorative containers are described.

[0345] (Smartphone Example)

[0346] Figure 7 A illustrates the external structure of the front face of a smartphone 100, Figure 7 B illustrates Figure 7An external structure of the back of the smartphone 100 is shown. The smartphone 100 includes, for example, a display portion 111 and a housing 112. The recording medium 20 is provided on the back of the housing 112. The housing 112 includes a laminate. The laminate is similar to any one of the laminates 10, 40, 10A, and 40A according to the first, second, third, and fourth embodiments and the modifications thereof, except that the substrate has a housing shape of the smartphone 100. Thus, the anti-counterfeit properties of the smartphone 100 and the like can be improved.

[0347] (Notebook computer example)

[0348] Figure 8 An external structure of a notebook computer 200 is shown. The notebook computer 200 includes a computer main body 210 and a display 220. The computer main body 210 includes a housing 211, a keyboard 212, a scroll / pad operation member 213, and click buttons 214 and 215. The housing 211 is provided with the recording medium 20. The housing 211 includes a laminate. The laminate is similar to any one of the laminates 10, 40, 10A, and 40A according to the first, second, third, and fourth embodiments and the modifications thereof, except that the substrate has a housing shape of the notebook computer 200. Thus, the anti-counterfeit properties of the notebook computer 200 and the like can be improved.

[0349] (Decorative container example)

[0350] Figure 9 An external appearance of a decorative container 300 is shown. The decorative container 300 includes a housing portion 311 and a lid 312 that covers the housing portion 311. The lid 312 is provided with the recording medium 20. The lid 312 includes a laminate. The laminate is similar to any one of the laminates 10, 40, 10A, and 40A according to the first, second, third, and fourth embodiments and the modifications thereof, except that the substrate has a shape corresponding to the lid 312. Thus, the anti-counterfeit properties of the decorative container 300 and the like can be improved.

[0351] (Passport example)

[0352] Figure 25 An external appearance of a booklet 400 is shown. The booklet 400 is a passport. The passport is one example of a booklet-type identification card. The booklet 400 includes a plurality of pages 410. The plurality of pages 410 are saddle-stitched. The recording medium 20 and the like is provided on at least one surface or both surfaces of the pages 410. A face photo and the like is drawn on the recording medium 20 and the like. The pages 410 are similar to any one of the laminates 10, 40, 10A, and 40A according to the first, second, third, and fourth embodiments and the modifications thereof. In this case, the substrate 11 can be paper and the like.

[0353] Although embodiments and modifications of this disclosure have been specifically described above, this disclosure is not limited to the above embodiments and modifications, and various modifications are possible based on the technical concept of this disclosure.

[0354] For example, the configurations, methods, processes, shapes, materials, and values ​​described in the above embodiments and modifications are merely examples, and different configurations, methods, processes, shapes, materials, and values ​​can be used as needed. The configurations, methods, processes, shapes, materials, and values ​​of the above embodiments and modifications can be combined with each other without departing from the essential points of this disclosure.

[0355] Within the numerical ranges described in stages in the above embodiments and modifications, the upper or lower limit of a numerical range in one stage can be replaced by the upper or lower limit of a numerical range in another stage. The materials illustrated in the above embodiments and modifications can be used alone or in combination with two or more other materials, unless otherwise stated.

[0356] In addition, the following configurations can be used in this disclosure. (1)

[0358] Laminated bodies, including:

[0359] Substrate;

[0360] An intermediate layer disposed on a substrate and having a receiving portion;

[0361] The recording medium disposed in the receiving portion; and

[0362] An overlay layer is set on the middle layer, where

[0363] The receiving portion is located within a part of the intermediate layer plane.

[0364] The receiving portion is either a through hole extending through the thickness of the intermediate layer or a recessed portion recessed in the thickness direction of the intermediate layer.

[0365] The recording medium is configured to change its color state via external stimuli, and

[0366] The substrate and intermediate layer are bonded together by melt or hot adhesive, and the intermediate layer and cover layer are bonded together by melt or hot adhesive. (2)

[0368] The laminate according to (1) wherein the thermosetting adhesive contains a thermosetting resin. (3)

[0370] According to the stacked body of (1), where

[0371] The substrate and intermediate layer are melted, the intermediate layer and the cover layer are melted, and

[0372] The substrate, the intermediate layer, and the cover layer contain a thermoplastic resin. (4)

[0374] The laminate according to any one of (1) to (3), wherein the recording medium is mounted in the housing portion. (5)

[0376] The laminate according to any one of (1) to (4), wherein the external stimulus is laser light. (6)

[0378] The laminate according to any one of (1) to (5), wherein the change in the colored state is an irreversible change. (7)

[0380] The laminate according to any one of (1) to (6), wherein

[0381] The recording medium includes a first color developing layer to an n-th color developing layer (where n is an integer of 2 or more), and

[0382] The first color developing layer to the n-th color developing layer contain coloring compounds that develop colors of different hues from each other. (8)

[0384] The laminate according to any one of (1) to (6), wherein

[0385] The recording medium includes a first color developing layer, a second color developing layer, and a third color developing layer, and

[0386] The first color developing layer, the second color developing layer, and the third color developing layer contain coloring compounds that develop colors of different hues from each other. (9)

[0388] The laminate according to any one of (1) to (6), wherein the recording medium includes a color developing layer containing three types of microcapsules that develop colors of different hues from each other. (10)

[0390] The laminate according to any one of (1) to (6), wherein

[0391] The recording medium includes a color developing layer, and

[0392] The color developing layer contains:

[0393] a coloring compound having electron-donating property;

[0394] a color developing agent having electron-accepting property; and

[0395] a light-to-heat conversion material. (11)

[0397] A card including the laminate according to any one of (1) to (10). (12)

[0399] A housing including the laminate according to any one of (1) to (10).

[0400] Further, the present disclosure can adopt the following configurations. (21)

[0402] A laminate, comprising:

[0403] a substrate;

[0404] a first intermediate layer provided on the substrate and having a housing portion;

[0405] a recording medium provided in the housing portion; and

[0406] a first intermediate layer provided on the first intermediate layer, wherein

[0407] the housing portion is provided in a part of a plane of the first layer intermediate layer,

[0408] the housing portion is a through-hole that penetrates in a thickness direction of the first intermediate layer or a recessed portion that is recessed in the thickness direction of the first intermediate layer,

[0409] the recording medium includes a color developing layer containing: a coloring compound having an electron donating property; a color developer having an electron accepting property; and a base resin,

[0410] the substrate, the first intermediate layer, and the cover layer contain the same type of resin material, and

[0411] the substrate and the first intermediate layer are bonded to each other by fusion, and the first intermediate layer and the cover layer are bonded to each other by fusion. (22)

[0413] A laminate, comprising:

[0414] a substrate;

[0415] a first intermediate layer provided on the substrate and having a housing portion;

[0416] a recording medium provided in the housing portion; and

[0417] a cover layer provided on the first intermediate layer, wherein

[0418] the housing portion is provided in a part of a plane of the first layer intermediate layer,

[0419] the housing portion is a through-hole that penetrates in a thickness direction of the first intermediate layer or a recessed portion that is recessed in the thickness direction of the first intermediate layer,

[0420] The recording medium includes a color developing layer containing: a coloring compound having electron donating property; a color developer having electron accepting property; and a matrix resin,

[0421] The substrate, the first intermediate layer, and the cover layer contain the same type of resin material, and

[0422] The substrate and the first intermediate layer are adhered to each other by a thermal adhesive, and the first intermediate layer and the cover layer are adhered to each other by a thermal adhesive. (23)

[0424] The laminate according to (21) or (22), wherein the resin material contains a thermoplastic resin. (24)

[0426] The laminate according to (21) or (22), wherein the resin material contains a polycarbonate-based resin. (25)

[0428] The laminate according to (21) or (22), wherein the resin material contains a polyethylene terephthalate-based resin. (26)

[0430] The laminate according to (22), wherein the thermal adhesive contains a thermosetting resin. (27)

[0432] The laminate according to any one of (21) to (26), wherein

[0433] The color developing layer is configured to be able to change a color state by laser light, and

[0434] The change in the color state is an irreversible change. (28)

[0436] The laminate according to any one of (21) to (27), wherein the color developing layer further contains a light-to-heat conversion material. (29)

[0438] The laminate according to any one of (21) to (28), wherein

[0439] The recording medium includes a plurality of color developing layers, and

[0440] The plurality of color developing layers contain coloring compounds that develop colors of different hues from each other. (30)

[0442] The laminate according to any one of (21) to (28), wherein

[0443] The recording medium includes a plurality of color developing layers and a plurality of second intermediate layers, and

[0444] Each of the plurality of second intermediate layers is disposed between color developing layers adjacent to each other. (31)

[0446] The laminate according to (30), wherein at least one of the plurality of second intermediate layers includes an ultraviolet-curable resin layer and a pressure-sensitive adhesive layer. (32)

[0448] The laminate according to (30), wherein

[0449] At least one of the plurality of second intermediate layers includes a resin layer, an ultraviolet-curable resin layer, and a pressure-sensitive adhesive layer,

[0450] The ultraviolet-curable resin layer is disposed between the resin layer and the pressure-sensitive adhesive layer, and

[0451] The resin layer contains a resin material of the same type as the matrix resin. (33)

[0453] The laminate according to (30), wherein at least one of the plurality of second intermediate layers includes, in order, a first pressure-sensitive adhesive layer, an ultraviolet-curable resin layer, and a second pressure-sensitive adhesive layer. (34)

[0455] The laminate according to (30), wherein at least one of the plurality of second intermediate layers is a film subjected to an easy-adhesion treatment. (35)

[0457] The laminate according to any one of (21) to (28), wherein

[0458] The recording medium includes a plurality of color developing layers, a plurality of second intermediate layers, and a protective layer,

[0459] The plurality of color developing layers includes a first color developing layer, a second color developing layer, and a third color developing layer,

[0460] The first color developing layer, the second intermediate layer, the second color developing layer, the second intermediate layer, the third color developing layer, the second intermediate layer, and the protective layer are laminated in order, and

[0461] The first color developing layer, the second color developing layer, and the third color developing layer contain coloring compounds that develop different colors from each other. (36)

[0463] The laminate according to any one of (21) to (35), wherein the color developing agent accounts for 16 mass% or less of the total amount of the color developing agent and the matrix resin. (37)

[0465] A card including the laminate according to any one of (21) to (36). (38)

[0467] A housing including the laminate according to any one of (21) to (36).

[0468] <6Reference Examples and Examples>

[0469] Hereinafter, the present disclosure will be specifically described with reference to reference examples and examples, but the present disclosure is not limited to these reference examples and examples.

[0470] [Reference Example 1-1]

[0471] First, a first adhesive layer is provided on a substrate, and then an intermediate layer is provided on the first adhesive layer. Next, a second adhesive layer is provided on the intermediate layer, and then a cover layer is provided on the second adhesive layer to obtain a laminate structure. Next, the laminate structure is heated and pressurized at a temperature of 120°C to adhere the substrate and the intermediate layer to each other with the first adhesive layer interposed therebetween, and to adhere the intermediate layer and the cover layer to each other with the second adhesive layer interposed therebetween. As described above, the intended laminate is obtained.

[0472] As the substrate, the first adhesive layer, the intermediate layer, the second adhesive layer, and the cover layer, the following materials are used.

[0473] Cover layer: 50-μm-thick polycarbonate film (hereinafter referred to as "PC film")

[0474] Second intermediate layer: 5-μm-thick epoxy resin layer (thermosetting resin layer)

[0475] Intermediate layer: 100-μm-thick PC film

[0476] First adhesive layer: 5-μm-thick epoxy resin layer (thermosetting resin layer)

[0477] Substrate: 25-μm-thick PC film

[0478] [Reference Example 1-2]

[0479] The laminate is obtained in a similar manner to Reference 1-1, except that the following materials are used as the substrate, the intermediate layer, and the cover layer.

[0480] Cover layer: 50-μm-thick polyvinyl chloride film (hereinafter referred to as "PVC film")

[0481] Intermediate layer: 100-μm-thick PVC vinyl film

[0482] Substrate: 25-μm-thick PVC vinyl film

[0483] [Reference Example 1-3]

[0484] The laminate is obtained in a similar manner to Reference 1-1, except that the following materials are used as the substrate, the intermediate layer, and the cover layer.

[0485] Cover layer: 50-μm-thick polyethylene terephthalate film (hereinafter referred to as "PET film")

[0486] Intermediate layer: 100-μm-thick PET film

[0487] Substrate: 25-μm-thick PET film

[0488] [Reference Example 1-4]

[0489] A laminate was obtained in a similar manner to Reference 1-1, except that the following materials were used as the substrate, intermediate layer, and cover layer.

[0490] Cover layer: 50-μm-thick PC film

[0491] Intermediate layer: 100-μm-thick PVC film

[0492] Substrate: 25-μm-thick PC film

[0493] [Reference Examples 2-1, 2-2, 2-3, 2-4]

[0494] A laminate was obtained in a similar manner to Reference 1-1, 1-2, 1-3, and 1-4, except that the laminate structure was obtained by sequentially laminating the substrate, intermediate layer, and cover layer, and then the laminate structure was heated and pressurized at a temperature of 180°C to melt the substrate and intermediate layer, and melt the intermediate layer and cover layer.

[0495] [Evaluation]

[0496] The adhesion, environmental considerations, and durability of the laminates obtained as described above were evaluated as follows.

[0497] (Adhesion)

[0498] First, the average peeling strength between the substrate and the intermediate layer and the average peeling strength between the intermediate layer and the cover layer were measured; the average peeling strength was measured by the method described in the first embodiment for measuring the average peeling strength of the laminate. Next, the measured average peeling strength was evaluated according to the following criteria. The evaluation results are shown in Table 1.

[0499] : The average peeling strength between the substrate and the intermediate layer and the average peeling strength between the intermediate layer and the cover layer were each 5.0 N / cm or more.

[0500] : The average peeling strength between the substrate and the intermediate layer and the average peeling strength between the intermediate layer and the cover layer were each 3.5 N / cm or more.

[0501] : The average peeling strength between the substrate and the intermediate layer and the average peeling strength between the intermediate layer and the cover layer were each less than 3.5 N / cm.

[0502] (Environmental considerations)

[0503] The environmental considerations for the laminated structure were assessed according to the following criteria. The assessment results are shown in Table 1.

[0504] ○: When laminates are processed using inadequate equipment, harmful substances (especially dioxins) will not be generated.

[0505] ×: Using inadequate equipment to process laminates may produce harmful substances (especially dioxins).

[0506] (Durability)

[0507] According to ISO / IEC 10373-1, the durability of laminates is evaluated based on the following criteria. The evaluation results are shown in Table 1.

[0508] ○: No change in appearance after heating (warping)

[0509] ×: Situations where appearance changes (warping) occur after heating.

[0510] [Table 1]

[0511]

[0512] *Changes in appearance after heating (warping)

[0513] The following can be seen from Table 1.

[0514] Good adhesion can be achieved when the substrate and intermediate layer, as well as the intermediate layer and cover layer, are bonded together using thermosetting resins or by melt bonding.

[0515] From the viewpoint of improving adhesion, it is preferable to bond the substrate and the intermediate layer, as well as the intermediate layer and the cover layer, by melting.

[0516] From an environmental perspective, it is preferable to use PC film or PET film as the substrate, intermediate layer, and cover layer.

[0517] From the perspective of improving durability, it is preferable to use PC film or PVC film as the substrate, intermediate layer and cover layer.

[0518] From the perspectives of environmental improvement and durability, PC film is preferred as the substrate, intermediate layer, and cover layer.

[0519] (Examples 1 to 3)

[0520] First, the layers shown in Table 2 are laminated to prepare a product with... Figure 15 The recording medium has the layered structure shown. Next, a 100 μm thick PET film with a frame shape is prepared (see...).Figure 16 The recording medium is mounted within the PET film frame as an intermediate layer. The thicknesses of the recording medium and the PET film are set to be substantially the same. Next, a laminate is obtained in a manner similar to that of Reference Example 2-1, except that the intermediate layer in which the recording medium is mounted is used as described above. It should be noted that after laminating the substrate, intermediate layer, and cover layer, the interface of the recording medium is also bonded through a heating and pressurizing process.

[0521] (Example 4)

[0522] The laminate was obtained in a manner similar to that of Example 1, except that it was prepared by laminating the layers shown in Table 3 to form a laminate. Figure 24 The recording medium with the layered structure shown.

[0523] (Example 5)

[0524] The laminate was obtained in a manner similar to that of Example 1, except that it was prepared by laminating the layers shown in Table 3 to form a laminate. Figure 19 The recording medium with the layered structure shown.

[0525] (Example 6)

[0526] The laminate was obtained in a manner similar to that of Example 1, except that it was prepared by laminating the layers shown in Table 3 to form a laminate. Figure 20 The recording medium with the layered structure shown.

[0527] (Example 7)

[0528] The laminate was obtained in a manner similar to that of Example 1, except that it was prepared by laminating the layers shown in Table 4 to form a laminate. Figure 21 The recording medium with the layered structure shown is prepared by laminating the layers shown in Table 4.

[0529] (Example 8)

[0530] The laminate was obtained in a manner similar to that of Example 1, except that it was prepared by laminating the layers shown in Table 4 to form a laminate. Figure 22 The recording medium with the layered structure shown.

[0531] (Example 9)

[0532] The laminate was obtained in a manner similar to that of Example 1, except that it was prepared by laminating the layers shown in Table 4 to form a laminate. Figure 21 The recording medium with the layered structure shown.

[0533] (Example 10)

[0534] The laminate was obtained in a manner similar to that of Example 1, except that it was prepared by laminating the layers shown in Table 4 to have the properties of... Figure 23 The recording medium with the layered structure shown.

[0535] [evaluation]

[0536] The adhesion and durability of the laminate obtained as described above were evaluated as follows.

[0537] (adhesion)

[0538] First, the average peeling strength between the layers of the laminate was measured. The average peeling strength was measured by the method described in the first embodiment for measuring the average peeling strength of the laminate. Next, the measured average peeling strength was evaluated according to the following criteria. Of the average peeling strengths between the layers of the laminate, the lowest average peeling strength is shown in Tables 2, 3, and 4. In addition, the position of the interface having the lowest average peeling strength is shown in Tables 2, 3, and 4.

[0539] O: The average peeling strength between the layers was 3.5 N / cm or more.

[0540] X: At least one of the average peeling strengths between the layers was less than 3.5 N / cm.

[0541] (authenticity)

[0542] The anti-counterfeit performance of the laminate was evaluated according to the following criteria.

[0543] O: At least one of the following conditions (1) or (2) was satisfied.

[0544] X: The following conditions (1) and (2) were not satisfied.

[0545] Condition (1): The average peeling strength between the layers of the laminate was 3.5 N / cm or more.

[0546] Condition (2): The interface having the lowest average peeling strength was between the color-developing layers.

[0547] (maximum color development OD)

[0548] First, the maximum color development OD of the laminate was measured using a spectrophotometer / densitometer eXact (manufactured by Shimadzu Corporation). Next, the color development was evaluated according to the following criteria. The evaluation results are shown in Tables 2, 3, and 4.

[0549] O: The maximum color development OD was 1.0 or more. An OD value of 1.0 was used as a reference, at which a person could be recognized when a figure was drawn.

[0550] X: The maximum color development OD was less than 1.0. When the OD value was less than 1.0, it was difficult to recognize a person when a figure was drawn.

[0551] (color gamut retention after heating)

[0552] First, the color gamut retention after heating was measured using a spectrophotometer / densitometer eXact. Next, the color gamut retention after heating was evaluated according to the following criteria. The evaluation results are shown in Tables 2, 3, and 4.

[0553] O: The color gamut retention rate after heating was 80% or more.

[0554] X: The color gamut retention rate after heating was less than 80%.

[0555] Note that in the case where the color gamut retention rate was 80% or more, the color representation of the person was sufficient when the person was drawn.

[0556] [Table 2]

[0557]

[0558] [Table 3]

[0559]

[0560] [Table 4]

[0561]

[0562] The detailed information of each component described in Tables 2, 3, and 4 is as follows.

[0563] PC: PC film

[0564] PET: PET film

[0565] Easy-adhesion-treated PET: PET film subjected to easy-adhesion treatment (DIAFOIL (registered trademark) manufactured by Mitsubishi Chemical Corporation)

[0566] OCA: Optical clear adhesive

[0567] UV resin: Ultraviolet-cured resin layer (acrylic resin layer for hard coat layer)

[0568] Matrix polymer layer: Resin layer containing a polymer of the same type as the matrix polymer contained in the adjacent color developing layer (in particular, polycarbonate-based resin layer)

[0569] Color developing layer Y1: Color developing layer containing a colorless dye that develops yellow, a color developing agent, and a polycarbonate-based resin, in which the content of the polycarbonate-based resin in the color developing layer is 58 mass%

[0570] Color developing layer Y2: Color developing layer containing a colorless dye that develops yellow, a color developing agent, and a polycarbonate-based resin, in which the content of the polycarbonate-based resin in the color developing layer is 58 mass%

[0571] Color developing layer C1: a color developing layer containing a leuco dye which develops cyan color, a color developing agent, and a polycarbonate-based resin, wherein the content of the polycarbonate-based resin in the color developing layer is 65% by mass

[0572] Color developing layer C2: a color developing layer containing a leuco dye which develops cyan color, a color developing agent, and a polycarbonate-based resin, wherein the content of the polycarbonate-based resin in the color developing layer is 65% by mass

[0573] Color developing layer M1: a color developing layer containing a leuco dye which develops magenta color, a color developing agent, and a polycarbonate-based resin, wherein the content of the polycarbonate-based resin in the color developing layer is 58% by mass

[0574] Color developing layer M2: a color developing layer containing a leuco dye which develops magenta color, a color developing agent, and a polycarbonate-based resin, wherein the content of the polycarbonate-based resin in the color developing layer is 58% by mass

[0575] From Tables 2, 3, and 4, the following can be seen.

[0576] When the intermediate layer between the color developing layers includes a matrix polymer layer, an ultraviolet-cured resin layer, and a pressure-sensitive adhesive layer, the adhesion between the color developing layers and the intermediate layer can be improved (see the evaluation results of Example 5).

[0577] When the intermediate layer between the color developing layers includes a pressure-sensitive adhesive layer, an ultraviolet-cured resin layer, and a pressure-sensitive adhesive layer, the adhesion between the color developing layers and the intermediate layer can be improved (see the evaluation results of Examples 6 and 10).

[0578] When the intermediate layer between the color developing layers includes a matrix polymer layer and a film, the adhesion between the color developing layers and the intermediate layer can be improved (see the evaluation results of Example 8).

[0579] When the intermediate layer between the color developing layers includes a film which is easy to handle for adhesion, the adhesion between the color developing layers and the intermediate layer can be improved (see the evaluation results of Examples 9 and 10).

[0580] (Reference Examples 3-1 to 3-8)

[0581] A PC film having a thickness of 25 μm, a polycarbonate-based resin layer having a thickness of 5 μm, and a PC film having a thickness of 25 μm were laminated, and then heated and pressed at a temperature of 180°C to be fused, thereby obtaining a sample. As the layer containing a polycarbonate-based resin, a layer having the composition shown in Table 5 was used.

[0582] (Adhesion)

[0583] First, the average peeling strength of the layers of the sample was measured. The average peeling strength was measured by the method of measuring the average peeling strength of the laminate described in the first embodiment. Next, the measured average peeling strength was evaluated according to the following criteria.

[0584] O: The average peeling strength between the layers is 3.5 N / cm or more.

[0585] X: At least one of the average peeling strengths between the layers is less than 3.5 N / cm.

[0586] The evaluation results are shown in Table 5 and Figure 26 Note that the average peeling strength shown in Table 5 indicates the average peeling strength between the polycarbonate-based resin layer and the PC film.

[0587] [Table 5]

[0588]

[0589] Detailed information of each component and each material described in Table 5 is as follows.

[0590] OCA: Optical clear adhesive

[0591] UV-cured resin layer: Acrylic resin layer for hard coat layer

[0592] Matrix polymer: Polycarbonate-based resin

[0593] Color developer: Compound represented by Formula (3)

[0594] As shown in Table 5 and Figure 26 When the proportion of the color developer in the total amount of the color developer and the matrix polymer is 16% by mass or less, the peeling strength can be 3.5 N / cm or more.

[0595] List of Reference Numerals

[0596] 10, 10A, 40, 40A Laminated body

[0597] 11, 21, 51 Substrate

[0598] 12, 14 Adhesive layer

[0599] 13, 16 Intermediate layer

[0600] 13A, 16A Containing portion

[0601] 15 Cover layer

[0602] 20, 20A, 20B, 20C, 20D, 20E, 20F, 20G, 20H, 50 Recording medium

[0603] 22, 25, 28, 33 Pressure-sensitive adhesive layer

[0604] 23, 26, 29, 34, 26A, 29A, 34A, 26B, 29B, 34B Heat-insulating layer

[0605] 24, 27, 30, 52 Color developing layer

[0606] 26A1, 29A1, 34A1 Resin layer

[0607] 26A2, 29A2, 34A2, 26B2, 29B2, 34B2 Ultraviolet curing resin layer

[0608] 26B1, 29B1, 34B1 Pressure sensitive adhesive layer

[0609] 31, 36 Protective layer

[0610] 32A, 32B, 32C, 35A, 35B, 35C, 37A, 37B, 37C, 38A, 38B, 38C Intermediate layer

[0611] 36A Ultraviolet curing resin layer

[0612] 36B UV cut layer

[0613] 36C Pressure sensitive adhesive layer

[0614] 36D Substrate

[0615] 52C, 52M, 52Y Microcapsule

[0616] 60 Test piece

[0617] 60A, 60B Adhesive

[0618] 61 Stretching member

[0619] 62 Chuck

[0620] 71 Test stand

[0621] 72 Chuck

[0622] 73A, 73B Movable roller

[0623] 100 Smartphone

[0624] 200 Notebook computer

[0625] 300 Decorative container

[0626] 400 Brochure

Claims

1. A laminate comprising: a substrate; a first intermediate layer provided on the substrate and having at least one accommodation portion; a recording medium provided in the accommodation portion; and a cover layer provided on the first intermediate layer, wherein the accommodation portion is provided in a part of a plane of the first intermediate layer, the accommodation portion is a through-hole that penetrates in a thickness direction of the first intermediate layer or a recessed portion that is recessed in the thickness direction of the first intermediate layer, the recording medium and the intermediate layer are integrated, the recording medium includes a color developing layer that contains a coloring compound having electron-donating property, a color developer having electron-accepting property, and a matrix resin, the substrate, the first intermediate layer, and the cover layer contain polycarbonate-based resin, and the substrate and the first intermediate layer are joined to each other by fusion, and the first intermediate layer and the cover layer are joined to each other by fusion.

2. A laminate comprising: a substrate; a first intermediate layer provided on the substrate and having at least one accommodation portion; a recording medium provided in the accommodation portion; and a cover layer provided on the first intermediate layer, wherein the accommodation portion is provided in a part of a plane of the first intermediate layer, the accommodation portion is a through-hole that penetrates in a thickness direction of the first intermediate layer or a recessed portion that is recessed in the thickness direction of the first intermediate layer, the recording medium and the intermediate layer are integrated, the recording medium includes a color developing layer that contains a coloring compound having electron-donating property, a color developer having electron-accepting property, and a matrix resin, the substrate, the first intermediate layer, and the cover layer contain polycarbonate-based resin, and the substrate and the first intermediate layer are joined to each other by a heat adhesive, and the first intermediate layer and the cover layer are joined to each other by a heat adhesive.

3. The laminate according to claim 1 or 2, wherein the color developing layer is configured to be able to change a color state by laser, and the change in the color state is an irreversible change.

4. The laminate according to claim 1 or 2, wherein the color developing layer further contains a light-to-heat conversion material.

5. The laminate according to claim 1 or 2, wherein the recording medium includes a plurality of the color developing layers, and the plurality of the color developing layers contain coloring compounds that differ from each other in color developing hue.

6. The laminate according to claim 1 or 2, wherein the recording medium includes a plurality of the color developing layers, a plurality of second intermediate layers, and a protective layer, the plurality of the color developing layers include a first color developing layer, a second color developing layer, and a third color developing layer, the first color developing layer, the second intermediate layer, the second color developing layer, the second intermediate layer, the third color developing layer, the second intermediate layer, and the protective layer are sequentially laminated, and the first color developing layer, the second color developing layer, and the third color developing layer contain coloring compounds that differ from each other in color developing hue. The proportion of the color developer in the total amount of the color developer and the matrix resin is 16 mass% or less. The coloring compound having electron-donating property contains a leuco dye.

7. The laminate according to claim 1 or 2, wherein The first intermediate layer is rewritable by external excitation of laser or heat.

8. The laminate according to claim 1 or 2, wherein ​ 9. The laminate according to claim 1 or 2, wherein ​ 10. The laminate according to claim 1 or 2, wherein The first intermediate layer is formed in a frame shape around a peripheral edge portion of one main surface of the base material.

11. The laminate according to claim 1 or 2, wherein The accommodating portion is at least two or more.

12. The laminate according to claim 1 or 2, wherein The recording medium includes a plurality of the color developing layers and a plurality of second intermediate layers, and The second intermediate layers are provided between the color developing layers adjacent to each other.

13. The laminate according to claim 12, wherein at least one of the plurality of the second intermediate layers includes an ultraviolet-curable resin layer and a pressure-sensitive adhesive layer.

14. The laminate according to claim 12, wherein at least one of the plurality of the second intermediate layers includes a resin layer, an ultraviolet-curable resin layer, and a pressure-sensitive adhesive layer, the ultraviolet-curable resin layer is provided between the resin layer and the pressure-sensitive adhesive layer, and the resin layer contains a resin material of the same type as the base resin.

15. The laminate of claim 12, wherein, at least one of the plurality of the second intermediate layers includes a first pressure-sensitive adhesive layer, an ultraviolet-curable resin layer, and a second pressure-sensitive adhesive layer in this order.

16. The laminate according to claim 12, wherein at least one of the plurality of the second intermediate layers is a film subjected to easy-adhesion treatment.

17. The laminate according to claim 2, wherein the heat adhesive contains a thermosetting resin.

18. A card, booklet, passport, security card, or housing containing the laminate according to any one of claims 1 to 17.

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