Heat stable iron oxides

Details Heat stable iron oxides Heat stable iron oxides

1976-09-14

1977-10-11

Garvin, Patrick P.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106308B, 106288B, 106292, 106306, C09C 124

Patent

active

040533255

ABSTRACT:
A thermally stable oxide product comprising particulate iron oxide coated with an insoluble metal metaphosphate in the amount of at least 1 percent by weight based on the weight of said product, wherein said iron oxide is hydrated ferric oxide or ferroso-ferric oxide, and wherein said metal is aluminum, barium, calcium, magnesium, iron or zinc, and said product is characterized by a procedural decomposition temperature of at least about 230.degree. C. for the hydrated ferric oxide and about 180.degree. C. for the ferroso-ferric oxide and a heat soak .DELTA.E of at most about 4.0 for the hydrated ferric oxide and about 5.0 for the ferroso-ferric oxide. A process claim is also asserted.

REFERENCES:
patent: 3650783 (1972-03-01), Yates
patent: 3931025 (1976-01-01), Woditsch et al.
patent: 3960611 (1976-06-01), Waller et al.

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