Colored metallic pigment and preparation thereof
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United States of America Patent
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Feb 17, 1998
Grant Date -
N/A
app pub date -
Oct 15, 1996
filing date -
Oct 20, 1995
priority date (Note) -
Expired
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Abstract
The instant invention relates to a process for the production of colored metallic pigments, as well as these colored metallic pigments themselves, their use to color high molecular weight organic material in the mass and compositions or masterbatches containing them. The colored metallic pigment consists essentially of multiple loose particles of 0.1-1000 .mu.m size each, said particles comprising a core of a transition metals, metalloid or alloy, preferably an aluminum flake, and a very fine, substantially continuous, uniform and homogeneous layer of organic pigment particles which is directly in contact with the metallic core. The core may be superficially oxidized. The colored metallic pigment is prepared by a vacuum deposition process, said process being performed in an apparatus constructed, modified or charged in such a way that the organic pigment gas flows toward the metallic core.
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