Magnetic iron oxide pigments and a process for their preparation

Details Magnetic iron oxide pigments and a process for their preparation Magnetic iron oxide pigments and a process for their preparation

1987-08-31

1990-05-08

Yarbrough, Amelia Burgess

Compositions: coating or plastic

Materials or ingredients

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

106480, 428403, C09C 122

Patent

active

049235192

ABSTRACT:
Magnetic iron oxide pigments having a monomolecular coating of a cobalt compound useful in magnetic signal recordings having a dependence of coercivity on temperature in the temperature range of from 76 K to 298 K of less than 0.13 kA/mK and having a coercivity on powder compressed to 0.9 g/cm.sup.3 of greater than 51 kA/m are prepared applying a preliminary coating of Fe.sub.3 O.sub.4 or a bertholloid compound to a magnetic iron oxide core material having the composition FeO.sub.x where x is a number from 1.33 to 1.55 and then covering the preliminary coating with a cobalt compound.

REFERENCES:
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patent: 4200680 (1975-06-01), Sasazawa et al.
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patent: 4297395 (1980-01-01), Buxbaum et al.
patent: 4371567 (1983-02-01), Chamard et al.
patent: 4414245 (1982-06-01), Timberlake et al.
patent: 4594267 (1985-06-01), Honma et al.
patent: 4664947 (1984-06-01), Mohammed Siddiq

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