C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
6/7, 117/48.5
C09C 1/00 (2006.01)
Patent
CA 1183657
ABSTRACT OF THE DISCLOSURE Nacreous pigments having improved light fastness are based on mica platelets coated with titanium dioxide and, optionally other additional metal oxides. These pigments carry an addtional thin manganese oxide layer. The pigments are prepared in a process wherein mica is coated in aqueous suspension with one or more titan un; dioxide hydrate layers and, optionally, with further metal oxide layers, mixed with the titanium dioxide hydrate or separately therefrom and then is washed, dried and calcined. The process further comprises precipitating an addtional layer of manganese hydroxide onto the base pigment, either directly after coating with the titanium dioxide hydrate and/or metal oxide layers or after the calcination thereof. The flakes are then washed, dried and calcined. The new pigment can be used for pigmenting plastics, lacquers, paints and cosmetics, inter alia.
418304
Johnson Ernest Peter
Merck Patent Gesellschaft Mit Beschrankter Haftung
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