Process for the preparation of pigments containing Cr.sub.2 O.su

Details Process for the preparation of pigments containing Cr.sub.2 O.su Process for the preparation of pigments containing Cr.sub.2 O.su

1992-03-23

1992-12-01

Group, Karl

Compositions: coating or plastic

Materials or ingredients

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

106441, C09C 134

Patent

active

051677083

ABSTRACT:
A process for the preparation of chromate-free, Cr.sub.2 O.sub.3 -containing pigments having a spinel, haematite or corundum structure comprises blending pigment-forming raw materials corresponding to the Cr.sub.2 O.sub.3 -containing pigments with from 0.5 to 10% by weight of boric acid or phosphoric acid, calculated as B.sub.2 O.sub.3 or P.sub.2 O.sub.5, respectively, and then annealing the blend whereby the chromate-free, Cr.sub.2 O.sub.3 -containing pigment is obtained.

REFERENCES:
patent: 2156451 (1939-05-01), Grasshoff et al.
patent: 3201270 (1965-08-01), Carpenter
Chemical Abstracts, vol. 65, No. 5, 1965, Ohio.
World Patents Index, Derwent Publications, 79066018B, Week 36, & SU-A-635116.

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