Nacreous pigments having improved light fastness, their preparat

Details Nacreous pigments having improved light fastness, their preparat Nacreous pigments having improved light fastness, their preparat

1982-12-27

1986-01-21

Williams, Howard S.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106291, 106DIG3, 427218, 427219, 428363, 428404, C08K 718, C09C 306

Patent

active

045655812

ABSTRACT:
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 additional thin manganese oxide layer. The pigments are prepared in a process wherein mica is coated in aqueous suspension with one or more titanium 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 additional 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 the washed, dried and calcined.
The new pigment can be used for pigmenting plastics, lacquers, paints and cosmetics, inter alia.

REFERENCES:
patent: 3008844 (1961-11-01), Grunin
patent: 3087828 (1963-04-01), Linton
patent: 3087829 (1963-04-01), Linton
patent: 3342617 (1967-09-01), Jackson
patent: 3650790 (1972-03-01), Klenke et al.
patent: 3832208 (1974-07-01), Jackson
patent: 3926659 (1975-12-01), Bernhard et al.
patent: 4134776 (1979-01-01), Rieger et al.

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