Coating composition, preferably printing ink for security applications, method for producing a coating composition and use of glass ceramics
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United States of America Patent
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Sep 2, 2003
Grant Date -
Sep 12, 2002
app pub date -
Feb 5, 2002
filing date -
Jan 10, 2000
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Abstract
The present invention relates to coating compositions, preferably printing inks for security applications comprising at least one organic resin, at least one pigment and optionally at least one organic solvent. Said pigment comprises glass ceramic composite particles, containing at least one crystalline particle embedded in a glass matrix. Said glass ceramic particles have a particle size in the range of between 0.1 .mu.m to 50 .mu.m. Preferably active ions selected from the group of the rare-earth elements are incorporated into the crystalline phase of the composite to provide the glass ceramics with luminescent up- and down-converting characteristics. Glass ceramic luminescent have excellent physical and chemical stability. The glass matrix permits as well the stabilization of the photophysically interesting halide host crystals which have low phonon energies. Such materials provide unusual excitation and emission properties.
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