US Patent 7745065 Volume hologram transfer foil, and volume hologram multilayer structure
Patent 7745065 was granted and assigned to Dai Nippon Printing on June, 2010 by the United States Patent and Trademark Office.
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The invention provides (1) a volume hologram transfer foil comprising a substrate and protective layer, a volume hologram layer and a heat seal layer stacked on the substrate in this order, wherein a multilayer structure comprising the protective layer, the volume hologram layer and the heat seal layer in this order is releasable from the substrate, and (2) a volume hologram transfer foil wherein the above protective layer is used as a heat seal layer. The heat seal layer comprises a polyester resin having a glass transition temperature of −10° C. to −30° C. With the invention, thermo-compression adhesion of the volume hologram layer to any application member, especially a polyester resin card is improved, so that the invention provides a volume hologram transfer foil useful for prevention of illegal copying, and a volume hologram multilayer structure formed using such a transfer foil.
US Patent 07745065 Volume hologram transfer foil, and volume hologram multilayer structure US Patent 7745065 Volume hologram transfer foil, and volume hologram multilayer structure
US Patent 07745065 Volume hologram transfer foil, and volume hologram multilayer structure
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