# US 11,305,514 B2 · Laminate, verification, and method of producing laminate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,305,514 B2 - Document ID: US11305514B2 - Status: Granted - Kind: B2 - Application number: 16/922,122 - Filed: 2020-07-07 - Published: 2020-10-22 - Granted: 2022-04-19 - Earliest claimed: 2018-01-09 - Assignees: Toppan Printing Co., Ltd. - Applicants: Toppan Printing Co., Ltd. - Inventors: Naoki Minamikawa - Web page: https://patentgrep.com/patent/US11305514B2 ## CPC - B32B 15/09: comprising polyesters - B42D 25/391: absorbing or reflecting polarised light - B32B 7/06: permitting easy separation - B32B 27/36: comprising polyesters - B32B 27/365: {comprising polycarbonates} - B42D 25/324: Reliefs - B42D 25/328: Diffraction gratings; Holograms - B42D 25/41: using electromagnetic radiation (B42D25/435 takes precedence) - B42D 25/455: using heat - B42D 25/46: using pressure - G02B 5/18: Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)} - G02B 5/1861: {Reflection gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials (G02B5/1809, G02B5/1828, G02B5/1833, G02B5/1838 and G02B5/1847 take precedence)} - B32B 2307/414: Translucent - B32B 2425/00: Cards, e.g. identity cards, credit cards - B32B 2429/00: Carriers for sound or information - B42D 25/23: Identity cards - B42D 25/24: Passports - B42D 25/378: Special inks - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A laminate includes a recording layer, a translucent front covering layer and a security foil laminated between the recording layer and the front covering layer and sealed in the laminate. The security foil has a thickness that is ⅕ or less the thickness of the recording layer to prevent or reduce falsification reusing the security foil. The security foil includes a relief layer having a relief surface and a protective layer covering the relief surface. In the thickness direction of the laminate, the protective layer adheres to the recording layer and the relief layer adheres to the front covering layer. The adhesion strength between the security foil and the recording layer is higher than the adhesion strength between the security foil and the front covering layer. ## Claims ### Claim 1 A laminate, comprising: a recording layer; a translucent front covering layer; and, a security foil having a thickness of ⅕ or less of a thickness of the recording layer, wherein the security foil is laminated between the recording layer and the front covering layer, for sealing in the laminate, wherein the security foil includes a relief layer having a relief surface and a protective layer covering the relief surface, the protective layer adhering to the recording layer and the relief layer adhering to the front covering layer in a thickness direction of the laminate; and, an adhesion strength between the security foil and the recording layer is higher than an adhesion strength between the security foil and the front covering layer, and wherein the recording layer and the front covering layer comprise polycarbonate; the protective layer comprises a first resin having a melting point lower than a melting point of the polycarbonate; and, the relief layer comprises a second resin having a melting point higher than the melting point of the polycarbonate. ### Claim 2 (depends on 1) The laminate of claim 1, wherein the recording layer includes an irradiated portion in a region covered by the security foil as viewed in the thickness direction of the laminate. ### Claim 3 (depends on 1) The laminate of claim 1, wherein the relief surface has at least one of properties of diffracting light that is incident on the relief surface, preventing or reducing reflection of light that is incident on the relief surface, isotropically reflecting light that is incident on the relief surface, anisotropically reflecting light that is incident on the relief surface, collecting light that is incident on the relief surface, and reflecting specific polarized light included in light that is incident on the relief surface. ### Claim 4 (depends on 1) The laminate of claim 1, wherein the front covering layer transmits part or all of the wavelength range of infrared light; and, the security foil transmits part or all of the wavelength range of infrared light. ### Claim 5 (depends on 1) A verification comprising a laminate of claim 1, and a support layer that reinforces the laminate. ### Claim 6 A method of producing a laminate, comprising: preparing a recording layer and a front covering layer; sealing a security foil between the recording layer and the front covering layer so as to be located inside outer edges of the recording layer and the front covering layer, the security foil having a thickness of ⅕ or less of a thickness of the recording layer, the security foil including a relief layer having a relief surface and a protective layer covering the relief surface; and, applying heat and pressure to the recording layer, the front covering layer and the security foil in a state where the security foil is disposed between the recording layer and the front covering layer to form a laminate sealing the security foil with the recording layer and the front covering layer, wherein an adhesion strength between the security foil and the recording layer is higher than an adhesion strength between the security foil and the front covering layer, wherein the recording layer and the front covering layer comprise polycarbonate; the protective layer comprises a first resin having a melting point lower than a melting point of the polycarbonate; and, the relief layer comprises a second resin having a melting point higher than the melting point of the polycarbonate.