Process for the preparation of bright, color-pure iron oxide red

Details Process for the preparation of bright, color-pure iron oxide red Process for the preparation of bright, color-pure iron oxide red

1985-12-26

1988-06-28

Lieberman, Paul

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106309, C09C 124

Patent

active

047536802

ABSTRACT:
A bright, color-pure iron oxide red pigment is produced by an improved process by precipitation of iron(II) salts in aqueous solution with an alkaline precipitating agent, oxidation at temperatures of from 20.degree. C. to 100.degree. C. and annealing of the resulting precipitation products under air to form iron oxide red pigments, wherein the improvement comprises before adding the alkaline precipitating agent, the iron(III) content of the aqueous solution is adjusted to 1 to 15 mol %, based on the total iron content of the iron salt solution.

REFERENCES:
patent: 4090888 (1978-05-01), Rademachers et al.
patent: 4234348 (1980-11-01), Brunn et al.
patent: 4256508 (1981-03-01), Patil et al.
patent: 4297395 (1981-10-01), Buxbaum et al.

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