Heat resistant yellow iron oxide pigment

Details Heat resistant yellow iron oxide pigment Heat resistant yellow iron oxide pigment

1981-10-16

1983-03-15

Bell, Mark

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

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

Patent

active

043766560

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, sodium aluminate, and a third metal component, exemplified by antimony ion or a zinc ion/titanium ion combination, to a hydrothermal (autoclave) treatment at about 100.degree.-240.degree. C. The separated solid product has a heat stability temperature (based on the color change from yellow to red when heated) appreciably higher than that of the starting iron oxide.

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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