Finely divided iron oxide black pigments, a process for their pr

Details Finely divided iron oxide black pigments, a process for their pr Finely divided iron oxide black pigments, a process for their pr

1988-09-28

1990-05-01

Rosenberg, Peter D.

Compositions: coating or plastic

Materials or ingredients

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

106412, 106418, 106439, C01G 4900

Patent

active

049215426

ABSTRACT:
Iron oxide black pigments useful as coloring pigments for lacquers and plastics are prepared by an improved process wherein finely divided iron oxide black suspensions obtained from the precipitation processor the aniline process are filtered, washed, dried and ground with the improvement in the process comprising grinding the dried iron oxide pigment in a jet mill with air as the grinding medium and with a water content of from about 1 to 6% by weight based on the iron oxide black pigment input to the process.

REFERENCES:
patent: 4090888 (1978-05-01), Rademachers
patent: 4123501 (1978-10-01), Kohler
patent: 4631089 (1986-12-01), Rademachers
patent: 4701221 (1987-10-01), Brunn
Patent Abstracts of Japan, vol. 9, No. 308, Dec. 1985; "Manufacture of Toner for Electrophotography".

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