Laminated multi-layer card with an inlaid security element in the form of relief structures
View Patent ↗A card, in particular credit card, identity card, bank card or the like is proposed that includes a plurality of laminated layers between which a security element with a relief structure, in particular holographic diffraction structures, is embedded. The materials are selected so that the softening temperature of the security element layer having the relief structure has a higher softening temperature than the card layers between which the security element is laminated. This permits the multilayer laminated card to be produced by conventional laminating methods without appreciably impairing the relief structure by the pressures and temperatures thereby occurring. Special combinations of materials and in particular suitable materials for the layer having the relief structure are proposed.
1. A card comprising a plurality of laminated layers between which a security element with a relief structure, such as holographic diffraction structures, is embedded, wherein the relief structure comprises at least one relief carrying layer selected from the group consisting of plastic and lacquer, said relief carrying layer having a higher softening temperature than said laminated layers of the card between which the security element is embedded.
2. The card according to claim 1 , wherein the relief carrying layer is a crosslinked reaction lacquer.
3. The card according to claim 2 , wherein the reaction lacquer is selected from the group consisting of radically, cationically and blue-light-curing lacquers.
4. The card according to claim 3 , wherein the lacquer is cationically or radically curable, and the lacquer is a UV-curable lacquer.
5. The card according to claim 2 , wherein the security element, comprises the relief carrying layer, a protective lacquer layer and a further support layer connected with the relief carrying layer.
6. The card according to claim 1 , wherein the material of the relief carrying layer is plastic and is selected from the group consisting of crystalline polyethylene terephthalate (PET) and polycarbonate (PC).
7. The card according to claim 5 , wherein the protective lacquer layer comprises a crosslinked reaction lacquer.
8. The card according to claim 1 , wherein the security element is transparent.
9. The card according to claim 8 , wherein the security element is printed on one side.
10. The card according to claim 8 wherein the security element has additional optical effects selected from the group consisting of printed images produced with liquid crystal polymers, iriodines or other viewing-angle-dependent inks.
11. The card according to claim 1 , wherein the relief structure of the relief carrying layer is metal-coated.
12. The card according to claim 11 , wherein the metal coating of the relief structure includes visually recognizable interruptions.
13. The card according to claim 12 , wherein the interruptions of the metal coating are provided in the form of elements selected from the group consisting of characters, logos and patterns.
14. The card according to claim 1 , wherein the security element is disposed in a transparent window of the card so that it is recognizable from both sides of the card.
15. The card according to claim 14 , wherein the security element includes a support layer provided on each side with a relief carrying layer.
16. The card according to claim 14 , wherein the relief carrying layer includes a plurality of relief structures each relief structure is covered by a protective lacquer layer.
17. The card according to claim 1 , including adhesive layers between the security element and adjoining layers of the card.
18. The card according to claim 1 , wherein the relief structure is embossed into the relief carrying layer.
19. The card according to claim 2 , wherein the lacquer layer directly adjoins another layer of the card.
20. The card according to claim 1 , wherein the relief carrying layer and the laminated layers are formed from materials having different softening temperatures, the relief carrying layer is constructed from at least one material which is not affected by temperatures and pressure exerted thereon upon embedding the security element between the laminated layers.