Nacreous pigments having improved light fastness, their preparation and use
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United States of America Patent
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-
Apr 9, 1985
Grant Date -
N/A
app pub date -
Dec 27, 1982
filing date -
Dec 24, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Nacreous pigments having improved light fastness are based on mica flakes coated with metal oxides, wherein the metal oxide layer is formed as a homogeneous mixed layer in which, in addition to titanium dioxide, silicon dioxide and iron oxide are also present. To produce these pigments, mica is coated in an aqueous suspension by coprecipitation of a titanium dioxide hydrate, iron hydroxide and silicon dioxide to form a uniform layer. The flakes are then washed, dried and calcined. The pigments can be used for the pigmenting of plastics, lacquers, paints and toiletries.
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