Bismuth-containing laser markable compositions and methods of making and using same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 20, 2004
Grant Date -
Jun 12, 2003
app pub date -
Dec 18, 2002
filing date -
Sep 22, 2000
priority date (Note) -
Expired
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Abstract
The present invention relates to additive, pigment or colorant materials which may be used for laser marking. The materials comprise oxides of bismuth and at least one additional metal. Preferred laser-markable bismuth-containing oxide compounds are of the formula Bi.sub.x M.sub.y O.sub.z, where M is at least one metal selected from Zn, Ti, Fe, Cu, Al, Zr, P, Sn, Sr, Si, Y, Nb, La, Ta, Pr, Ca, Mg, Mo, W, Sb, Cr, Ba and Ce, x is from about 0.3 to about 70, y is from about 0.05 to about 8, and z is from about 1 to about 100. The bismuth-containing material may be dispersed in a substrate which is subsequently irradiated by a laser to provide a contrasting mark in the irradiated region.
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