PIEZOCHROMIC SECURITY ELEMENT
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United States of America Patent
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Issued Date -
Apr 19, 2012
app pub date -
Apr 7, 2010
filing date -
Apr 7, 2009
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Abstract
The invention discloses a reversibly piezochromic security element for the forgery-protection of value documents, the security element being characterized in that it comprises a collection of optically contrasting pigment particles in a film or a coating layer of an elastic polymer. In a particular embodiment, the particles are optically variable pigment flakes, oriented in a position which is substantially different from an alignment in the plane of the film or coating layer.
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