SECURITY ELEMENT HAVING A VARIABLE OPTICAL EFFECT

专利名称：SECURITY ELEMENT HAVING A VARIABLE

OPTICAL EFFECT AND SECURITY SHEET ORDOCUMENT OR ARTICLE COMPRISING IT

发明人：ROSSET, HENRI申请号：EP09772742.4申请日：20090702公开号：EP2307615B1公开日：20120905

摘要：The present invention relates to a security element having a variable opticaleffect, characterized in that it comprises at least one quasi-spherical particle (10) havingat 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 atleast one thermochromic compound and/or at least one photochromic compoundundergoing a reversible transition from a colourless state to a dark colour or from a darkcolour to a colourless state when said compound is subjected to an activation

temperature or to activation radiation respectively, the dark colour making it possible tosee the interference effect of said liquid crystal, and the colourless state making thisinterference effect no longer visible.

申请人：ARJOWIGGINS SECURITY,ARJOWIGGINS SECURITY,ARJOWIGGINS SECURITY

地址：FR

国籍：FR

代理机构：Tanty, François

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