PIGMENTS HAVING A VIEWING ANGLE DEPENDENT SHIFT OF COLOR, METHOD FOR PRODUCING SAID PIGMENTS, USE OF SAID PIGMENTS IN SECURITY APPLICATIONS, COATING COMPOSITION COMPRISING SAID PIGMENTS AND A DETECTING DEVICE
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United States of America Patent
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Feb 24, 2004
Grant Date -
Jan 23, 2003
app pub date -
Aug 14, 2002
filing date -
Feb 16, 2000
priority date (Note) -
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Abstract
The invention describes luminescent optically variable pigments (OVP), methods for obtaining such pigments, as well as the use of such pigments as security elements in inks, coatings and articles. The luminescence centers are preferably incorporated into the dielectric material of the OVP's opticalFabry-Perot resonance cavity, allowing for the machine-discrimination of luminescent OVP from simple mixtures of luminescents and non-luminescent OVP.
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