Process for the preparation of iron yellow pigments

Details Process for the preparation of iron yellow pigments Process for the preparation of iron yellow pigments

1990-02-26

1991-12-31

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

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

423633, 423634, C09C 122, C01G 4902

Patent

active

050768484

ABSTRACT:
An improved process is disclosed for preparing iron yellow pigments from iron--(II) salt solutions, in the presence of iron scrap, by injection of air at elevated temperatures. After formation of the pigment, the reaction suspension is stirred without additional gas injection, whereby lighter, purer yellow pigments are obtained.

REFERENCES:
patent: 1327061 (1920-06-01), Penniman
patent: 1368748 (1921-02-01), Penniman
patent: 2111726 (1932-07-01), Plews
patent: 3843773 (1974-10-01), Pingaud
patent: 4060596 (1977-11-01), Nakamura
patent: 4112063 (1978-09-01), Buxbaum
patent: 4221766 (1980-09-01), Pabst
patent: 4620879 (1976-11-01), Burow et al.
patent: 4698100 (1987-10-01), Burow et al.
patent: 4806335 (1989-02-01), Saito et al.
Chemical Abstracts, Dec. 1986, p. 133, Columbus OH.

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