D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 21/48 (2006.01) D21H 21/54 (2006.01) G07D 7/06 (2006.01) G07D 7/12 (2006.01)
Patent
CA 2729624
The present invention relates to a security element having a variable optical effect, characterized in that it comprises at least one quasi-spherical particle (10) having at least one external part (11) and at least one internal part (12), said external part (11) comprising at least one cholesteric liquid crystal and said internal part (12) comprising at least one thermochromic compound and/or at least one photochromic compound undergoing a reversible transition from a colourless state to a dark colour or from a dark colour to a colourless state when said compound is subjected to an activation temperature or to activation radiation respectively, the dark colour making it possible to see the interference effect of said liquid crystal, and the colourless state making this interference effect no longer visible.
La présente invention concerne un élément de sécurité à effet [Suite sur la page suivante] optique variable caractérisé en ce que qu'il comprend au moins une particule quasi-sphérique (10) comportant au moins une partie externe (11) et au moins une partie interne (12), ladite partie externe (11) comportant au moins un cristal liquide cholestérique et ladite partie interne (12) comportant au moins un composé thermochrome et/ou un composé photochrome présentant une transition réversible d'un état incolore à une couleur foncée ou d'une couleur foncée à un état incolore lorsque ledit composé est soumis respectivement à une température d'activation ou à un rayonnement d'activation, la couleur foncée permettant de voir l'effet interférentiel dudit cristal liquide et l'état incolore de ne plus voir cet effet interférentiel.
Arjowiggins Security
Robic
LandOfFree
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