Preparation of improved heat stable yellow iron oxide pigments

Details Preparation of improved heat stable yellow iron oxide pigments Preparation of improved heat stable yellow iron oxide pigments

1981-10-05

1983-02-22

Bell, Mark

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106304, 106308B, 423633, 427218, C01G 4902, C09C 124

Patent

active

043746772

ABSTRACT:
Yellow iron oxide pigments having improved heat stability are prepared by subjecting an alkaline slurry of conventional yellow iron oxide, a soluble ferric salt, and sodium aluminate to a hydrothermal (autoclave) treatment at 100.degree.-240.degree. C., separating and slurrying the resultant solid product, and subjecting that product to a second hydrothermal treatment of 250.degree.-350.degree. C. The original iron oxide has a heat stability (based on color change from yellow to red) temperature of about 203.degree. C., while the final product shows a change at 270.degree. C.

REFERENCES:
patent: 3382174 (1968-05-01), Hund
patent: 3919404 (1975-11-01), Beck
patent: 3946103 (1976-03-01), Hund
patent: 3969494 (1976-07-01), Nobuoka et al.
patent: 3987156 (1976-10-01), Nobuoka
patent: 4140539 (1979-02-01), Hund et al.

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