Color-intensive iron oxide black pigments and process for their

Details Color-intensive iron oxide black pigments and process for their Color-intensive iron oxide black pigments and process for their

1984-11-07

1986-12-23

Yarbrough, Amelia B.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106 23, 423138, C09C 122

Patent

active

046310894

ABSTRACT:
Highly pure and highly color intensive black anisometric magnetite iron oxide pigment having an FeO content of from 26 to 29% by weight and manganese content of less than 0.1% by weight, said pigment further having a specific BET surface area of from 5 to 15 square meters per gram and being needle shaped particles with an average needle diameter of 0.1 to 0.2 .mu.m and an average needle length of from 0.6 to 0.8 .mu.m are produced by producing .alpha.-FeOOH particles by alkali precipitation of an iron salt solution with a nuclear formation stage oxidation and a pigment growth stage oxidation followed by reduction and passivation.

REFERENCES:
patent: 3836889 (1962-05-01), Frey
patent: 4054639 (1977-10-01), Garberi et al.
patent: 4358431 (1982-11-01), Brunn et al.
patent: 4382822 (1983-05-01), Mayer et al.
Chemical Abstract, vol. 82, No. 45924p, p. 168, Feb. 24, 1975.

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