Preparation of a mixed-phase pigment based on iron oxide and chr

Details Preparation of a mixed-phase pigment based on iron oxide and chr Preparation of a mixed-phase pigment based on iron oxide and chr

1985-08-05

1987-02-17

Yarbrough, Amelia B.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106309, C09C 124

Patent

active

046437720

ABSTRACT:
A process for the preparation of a mixed-phase pigment based on iron oxide and chromium oxide by heating a mixture of the oxides, hydroxides or oxide hydroxides of iron and of chromium at from 600.degree. to 1100.degree. C. and then comminuting the product and working it up in a conventional manner. The essential feature of the invention is that a mixture of transparent .alpha.-iron oxide having an orthorhombic bipyramidal crystal structure and a chromium(III) hydroxide, which has been applied onto the transparent iron oxide by precipitation with an alkali, preferably sodium carbonate, is heated.
The pigments according to the invention give deep colorations and are readily dispersible.

REFERENCES:
patent: 4069164 (1978-01-01), Dezawa et al.
patent: 4125474 (1978-11-01), Dezawa et al.
patent: 4482645 (1984-11-01), Jennings et al.

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