Additive for YAG laser marking
AssigneeEngelhard Corporation
InventorsJames B. Carroll, Jr., Steven A. Jones
Life of this patent
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Abstract
A calcined powder of co-precipitated mixed oxides of tin and antimony is used as a YAG laser marking additive. The additive is designed to impart little to no color to the plastic in which it is incorporated but to provide a high contrast dark marking after being exposed to a YAG laser.
Claims20
A YAG laser marking additive comprising a calcined powder consisting of co-precipitated mixed oxides of antimony and tin in which the antimony is at a higher concentration at the surface of the particle than in the particles as a whole.
A method of making a YAG laser marking additive consisting of co-precipitated mixed oxides of antimony and tin comprising coprecipitating mixed oxides of antimony and tin at a pH of less than about 2.6 and calcining the resulting coprecipitate.
A YAG laser markable article comprising a body of material which is transparent to a YAG laser beam and which contains a YAG laser marking additive comprising a calcined powder consisting of co-precipitating mixed oxides of tin and antimony.
Dependencies are inferred from the claim text.