SECURITY ELEMENT WITH COLOUR SHIFT EFFECT AND FLUORESCENT FEATURES AND METHOD FOR PRODUCTION AND USE OF SAME

Abstract

The invention relates to a security element having a coating consisting of a material which has an optically variable effect, in particular a colour shift effect, and has recesses that can be recognised in transmitted light, wherein the security element comprises a support substrate, a partial layer with recesses, and a layer structure that generates a colour shift effect, characterised in that the security element, on the face which has the coating consisting of the material that has an optically variable effect, comprises one or more partial coatings consisting of a layer which has colours that are transparent in visible light and fluorescent in UV light.

Claims

1. A security element, having a coating consisting of a material which has an optically variable effect, in particular a color-shift effect, and which has recesses that can be recognized in transmitted light, wherein the security element comprises a support substrate, a partial layer with recesses, and a layer structure that generates a color-shift effect, characterized in that the security element, on the side which has the coating consisting of the material that has an optically variable effect, has one or more partial coatings consisting of a layer which has colors that are transparent in visible light and fluorescent in UV light.

2. The security element according to claim 1, characterized in that the layer structure that generates the optically variable effect, in particular the color-shift effect, is formed by a coating consisting of a material which has an optically variable effect and a partial layer which is formed from an opaque coating which has light-absorbing properties on the side which faces the coating consisting of the material having an optically variable effect and which has metallic coloring on the side which faces away from the coating consisting of a material having an optically variable effect, wherein the partial opaque coating consists of a light-absorbing metallic layer and a reflecting metallic layer.

3. The security element according to claim 2, characterized in that the material that generates the optically variable effect is a liquid crystal polymer layer formed from cholesteric liquid crystals or a mixture of cholesteric and nematic liquid crystals.

4. The security element according to claim 2, characterized in that the material have the optically variable effect is a printing ink with optically variable pigments, selected from cholesteric liquid crystal pigments or a mixture of nematic and cholesteric liquid crystal pigments, optically variable interference pigments or iridescent pigments.

5. The security element according to claim 2, characterized in that the light-absorbing metallic layer consists of non-stoichiometric aluminum oxide or stoichiometric or non-stoichiometric copper oxide.

6. The security element according to claim 2, characterized in that the reflecting metallic layer consists of Al, Sn, Cu, Zn, Pt, Au, Ag, Cr, Ti, Mo, Fe, Pd, Ni, Co or alloys thereof.

7. The security element according to claim 2, characterized in that the recesses that are visible in transmitted light are in the form of positive or negative characters, letters, numbers, images, symbols, lines, guilloche patterning of a dot grid or line grid or of a halftone grid.

8. The security element according to claim 1, characterized in that the layer structure that generates the optically variable effect, in particular the color-shift effect, in each case consists of at least one layer reflecting electromagnetic waves, a polymeric spacer layer and a layer formed from metallic clusters.

9. The security element according to claim 1, characterized in that the fluorescent colors consist of organic fluorescent dyes.

10. The security element according to claim 1, characterized in that the optical appearance of the fluorescent colors is coordinated with the appearance of the optically active security feature.

11. The security element according to claim 1, characterized in that the fluorescent colors correspond to the colors of the optically active security element.

12. The security element according to claim 1, characterized in that the fluorescent colors are coordinated with the sequence of recesses.

13. The security element according to claim 1, characterized in that the security element has one or more additional partial or entire-surface layers with optical, optically active, electrically conductive or magnetic properties.

14. The security element according to claim 11, characterized in that the magnetic layer is a coded magnetic layer.

15. The security element according to claim 10, characterized in that the magnetic layer consists of magnetic materials with the same or different coercivity and/or remanence.

16. The security element according to claim 1, characterized in that the security element is, on one or both sides, provided with one or more pigmented or unpigmented protective lacquer layer(s).

17. The security element according to claim 1, characterized in that the security element is one or both sides, provided with a pigmented or unpigmented heat seal coating, cold seal coating or self-adhesive coating.

Description

[0048] FIGS. 1 to 4 depict embodiments of the security element according to the invention.

[0049] In said figures, [0050] 1 is a support substrate, [0051] 2 is a fluorescent layer, [0052] 3 is an LC layer, [0053] 4 is an adhesion-promoting layer, [0054] 5 is an adhesive coating, [0055] 6 is a black metallization, [0056] 7 is a black print layer, [0057] 8 is a black etch-resistant layer, [0058] 9 is a metallic layer, for example an aluminum layer, [0059] 10 is a laminated adhesive layer.

[0060] The security element according to the invention is suitable for the at least partial embedding in or application onto identification, cards, banknotes or labels, seals and the like, but also as packaging material for example in the pharmaceutical, electronics and/or food industries, for example in the form of blister film, folding boxes, covers, film packaging and the like.

[0061] For the application as security features, the substrates or film materials are preferably cut into strips, threads or patches, and the width of the strips or threads can preferably be 0.5-20 mm and the patches preferably have average widths and lengths of 0.3-20 mm.

[0062] For the application in or on packaging, the film material is preferably cut into strips, bands, threads or patches, and the width of the threads, strips or bands is preferably 0.5-50 mm and the patches preferably have average widths and lengths of 2-30 mm.