Embossing lacquer for micro-optical security elements
AssigneeGeisecke & Devrient GmbH
InventorsWinfried Hoffmüller, Marius Dichtl
Life of this patent
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Abstract
A highly refractive embossing lacquer for producing micro-optic arrangements which contains at least one binding agent which has at least one radiation-curing compound system having one or more organic compounds. The highly refractive embossing lacquer has at least a portion of the organic compounds of the radiation-curing compound system having molecules with at least one polarizable element, so that a polymeric material with a refractive index of greater than 1.5 is formed upon radiation curing. A security element which is produced with at least one micro-optic authenticity feature is also provided. The micro-optic authenticity features permit the production of security elements that are so thin that they can be easily incorporated into value documents.
Claims37
A security element for marking the authenticity of objects of value, said security element comprising:
- a substrate and at least one micro-optic authenticity feature provided on said substrate, the micro-optic authenticity feature comprising a first micro-optic arrangement with a multiplicity of focusing elements which are present in a first grid, and a second micro-optic arrangement with a multiplicity of microstructures which are present in a second grid,
- the first and second arrangements being disposed such that the microstructures of the second arrangement are observable as magnified upon viewing through the focusing elements of the first arrangement,
- wherein the first and/or second micro-optic arrangements comprise a polymeric material and are produced from a highly refractive embossing lacquer which contains at least one binding agent which has at least one radiation-curing compound comprising one or more organic compounds, at least a portion of said organic compounds of the radiation-curing compound comprising molecules with at least one polarizable element, so that the radiation-curing compound is configured to form a polymeric material with a refractive index of greater than 1.5 upon radiation curing of the radiation-curing compound.
Dependencies are inferred from the claim text.