Patent ID: 8507154
Filing Date: 2013-08-13
Classification: B42D,G03H

Abstract:
1. A process for the production of a security element in the form of a multi-layer film body including the steps: providing a carrier film; applying a volume hologram layer formed from a photopolymer to the carrier film, the volume hologram layer having a volume hologram written into the photopolymer, the volume hologram providing a first item of information; applying at least one mask layer to the volume hologram layer, wherein the at least one mask layer is partially applied to the volume hologram layer in the form of a pattern; applying a full-area layer of at least one beam-hardenable or thermally hardenable expansion agent and/or contraction agent to the mask layer, wherein regions of the volume hologram layer not covered by the mask layer are in contact with the at least one expansion agent and/or contraction agent; allowing at least partial diffusion of the at least one expansion agent and/or contraction agent into the volume hologram layer with local expansion and/or contraction of the Bragg grating, thereby altering the volume hologram in the volume hologram layer to provide a second item of optical information, and beam hardening or thermally hardening the carrier film, the volume hologram layer, the mask layer, and the at least one expansion agent and/or contraction agent together to produce a multi-layer film body arranged as follows: carrier film, volume hologram layer, mask layer, expansion agent and/or contraction agent, wherein the mask layer is part of the multi-layer film body and is at least partially impervious to the at least one expansion agent and/or contraction agent and has openings which are pervious to the at least one expansion agent and/or contraction agent, and wherein different refractive indices are formed region-wise in the photopolymer of the volume hologram layer, which provide a Bragg grating with the provision of a first item of optical information, and wherein an adhesive layer is provided to the multi-layer film body for adhering the security element to a security document.