Corundum Crystal Structure Pigments With Reduced Soluble Chromium Content
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United States of America Patent
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Issued Date -
Mar 18, 2010
app pub date -
Sep 15, 2008
filing date -
Sep 15, 2008
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Abstract
The potential for release of soluble chromium (VI) ions in the production or processing of certain pigments is reduced by use of certain additives. The additives include aluminum metaphosphate, aluminum fluoride, tungsten oxide, tungstic acid, and mono-ammonium phosphate. The pigments are those which contain chromium and have a corundum crystal structure.
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