Synthetic pigment having the color of natural uncalcined umber a

Details Synthetic pigment having the color of natural uncalcined umber a Synthetic pigment having the color of natural uncalcined umber a

1991-07-22

1992-02-04

Group, Karl

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106401, C09C 122

Patent

active

050857061

ABSTRACT:
Pigments having the color of natural uncalcined umber contain more than 85% by weight of iron oxides, expressed as Fe.sub.2 O.sub.3, and less than 0.1% by weight of crystalline silica are obtained by mixing iron oxides of spinel structure and/or hematite structure with or without iron oxide yellow and said pigments are useful in coloring paints, lacquers and building materials.

REFERENCES:
patent: 3382174 (1968-05-01), Hund
patent: 4701221 (1987-10-01), Brunn et al.
patent: 4702775 (1987-10-01), Ostertag et al.
patent: 4753680 (1988-06-01), Burow et al.
patent: 5002609 (1991-03-01), Rademachers et al.

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