Optically variable security attribute

Details Optically variable security attribute Optically variable security attribute

B - Operations, Transporting

41

M

B41M 3/14 (2006.01) B42D 15/00 (2006.01) B42D 15/10 (2006.01) D21H 21/48 (2006.01) G07D 7/00 (2006.01)

Patent

CA 2374435

The invention relates to an optically variable security attribute for documents, securities, banknotes, packagings, and goods. The aim of the invention is to provide an optically variable security attribute having concealed detectable attributes in order to increase the security against counterfeiting. To this end, the invention provides an optically variable security attribute comprising diffractive structures that consist of an electrically conductive polymer and of at least one supporting film (1), a protective layer (7), a lacquer coat (3), and a reflecting layer (4), and the electrically conductive polymer is a polyethylene dioxythio polystyrene sulfonate (PEDT/PSS) arranged on different layers.

L'invention concerne une caractéristique de sécurité variable optiquement pour documents, titres, billets de banque, emballages et marchandises. L'invention vise à pourvoir une caractéristique de sécurité variable optiquement de caractéristiques détectables masquées afin d'augmenter la sécurité contre la falsification. A cet effet, on utilise une caractéristique de sécurité variable optiquement ayant des structures à effet de diffraction et comportant un polymère électroconducteur et au moins un film support (1), une couche de protection (7), une couche de peinture (3) et une couche réflectrice (4), le polymère électroconducteur étant un polyéthylène-dioxythio-polystyrène-sulfonate (PEDT/PSS) disposé sur différentes couches.

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