Co-containing magnetic pigments, processes for the production th

Details Co-containing magnetic pigments, processes for the production th Co-containing magnetic pigments, processes for the production th

1990-03-05

1991-07-02

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

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

106459, 428900, 428694, C04B 1400

Patent

active

050282697

ABSTRACT:
Acicular magnetic iron oxide pigments are disclosed which have a Co content of 1 to 5% by weight and an FeO content of 5 to 12% by weight. The pigments may optionally contain an additional dopant selected from zinc, phosphate and SiO.sub.2. The pigments are useful in magnetic recording media such as video tapes.

REFERENCES:
patent: 3931025 (1976-01-01), Woditsch
patent: 4933014 (1990-06-01), Kathrein

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