Black-to-color shifting security element

B - Operations – Transporting – 44 – F

Patent

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Details

B44F 1/12 (2006.01) B42D 15/00 (2006.01) B42D 15/10 (2006.01) C09D 5/29 (2006.01)

Patent

CA 2609631

The invention discloses a security element for a banknote, a document of value, right or identity, a ticket, a label, a branded good identifier, or a tax banderole. The element comprises a combination of a coating containing at least one optically variable pigment having a substantial viewing-angle dependent color variation, with at least one selective spectral absorbing material, which blocks out visible spectral components reflected by the optically variable pigment at orthogonal incidence. The security element appears black when viewed at orthogonal angle, and colored when viewed at grazing angle.

La présente invention concerne un élément de sécurité pour un billet de banque, un document de valeur, de droit ou d'identité, un billet, une étiquette, un identificateur de bien de marque ou un timbre fiscal. Un tel élément comprend une combinaison d'un revêtement contenant au moins un pigment optiquement variable présentant une variation sensible en fonction de l'angle de vision, avec au moins un matériau absorbant sélectif dans le spectre qui bloque les composants visibles du spectre reflétés par le pigment optiquement variable sur une incidence orthogonale. L'élément de sécurité a l'air noir lorsqu'on le regarde à un angle orthogonal et coloré lorsqu'on le regarde depuis un angle incident.

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