Preparation of effect pigments coated with metal oxides
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United States of America Patent
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Nov 12, 1985
Grant Date -
N/A
app pub date -
Oct 3, 1983
filing date -
Oct 8, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Effect pigments are prepared by a process in which a pigment substrate comprising flaky particles, of which from 10 to 90% by weight have a longest dimension of from 60 to 400 .mu.m and the remainder have a longest dimension of from 3 to 30 .mu.m, are treated, in a fluidized bed, with one or more metal chlorides and steam in the gas phase, at elevated temperatures. During this procedure, the particles are coated with metal oxide. After coating, the fraction having a particle size of from 3 to 30 .mu.m is separated off as the effect pigment. The coatings obtained adhere very firmly to the flaky particles. The pigments are used for coloring finishes, plastics, cosmetic products and glasses.
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