Laser marking compositions and method
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United States of America Patent
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Jan 7, 2003
Grant Date -
N/A
app pub date -
Jun 21, 2000
filing date -
Jun 22, 1999
priority date (Note) -
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Importance
Abstract
Laser markable coatings include a marking pigment and a fixing material. The marking pigment may comprise titanium dioxide, zinc oxide, zinc sulfide or the like. The fixing material may comprise bismuth trioxide, antimony oxide and the like, and preferably has a melting temperature below 1,300.degree. C. A preferred laser marking composition includes TiO.sub.2 and Bi.sub.2 O.sub.3 in a weight ratio of about 1:1. After application to a substrate and laser irradiation, the fixing material stabilizes the resultant mark.
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