Heat-stable iron oxide black pigments, processes for their produ

Details Heat-stable iron oxide black pigments, processes for their produ Heat-stable iron oxide black pigments, processes for their produ

1989-06-14

1991-10-08

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

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

106499, C09C 122

Patent

active

050551361

ABSTRACT:
A heat-stable iron oxide black pigment resistant to hydrothermal treatment in air at temperatures above 180.degree. C. and which has a specific BET surface of 0.5 to 5 m.sup.2 /g is useful as a coloring agent for building materials, paints, cements, bricks and so forth and is prepared by reacting an aqueous solution of FeOOH, iron (II) salts and alkalis at elevated temperature and precipitating iron oxide from the solution with Na.sub.2 CO.sub.3 at temperatures in the range from 80.degree. C. to the boiling point of the solution.

REFERENCES:
patent: 3036889 (1962-05-01), Frey
patent: 3533820 (1970-10-01), Lewis et al.
patent: 3867516 (1975-02-01), Bodson
patent: 4123501 (1978-10-01), Kohler et al.
patent: 4631089 (1986-12-01), Rademachers et al.
patent: 4701221 (1987-10-01), Brunn et al.
Patent Abstracts of Japan, vol. 2, No. 18 (C-78) (1013), Jun. 28, 1978 for JP-A 5 335 697.

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