Process for the preparation of pigments containing Cr.sub.2 O.sub.3
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United States of America Patent
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-
Dec 1, 1992
Grant Date -
N/A
app pub date -
Mar 23, 1992
filing date -
Apr 4, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the preparation of chromate-free, Cr.sub.2 O.sub.3 -containing pigments having a spinel, haematite or corundum structure comprises blending pigment-forming raw materials corresponding to the Cr.sub.2 O.sub.3 -containing pigments with from 0.5 to 10% by weight of boric acid or phosphoric acid, calculated as B.sub.2 O.sub.3 or P.sub.2 O.sub.5, respectively, and then annealing the blend whereby the chromate-free, Cr.sub.2 O.sub.3 -containing pigment is obtained.
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