Magnetic pigments with improved orientability and a process for

Details Magnetic pigments with improved orientability and a process for Magnetic pigments with improved orientability and a process for

1974-07-18

1977-03-29

Garvin, Patrick P.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106308Q, 252 6256, C09C 124

Patent

active

040147100

ABSTRACT:
An acicular, magnetic iron oxide pigment containing about 0.05 to 5% by weight of an organo silicon compound is produced by treating iron oxide hydroxide seeds either dry or in suspension with an organo silicon compound. Preferred organo silicon compounds comprise polymethylphenylsiloxane, polydimethylsiloxane and polydiphenylsiloxane. Trivalent metal ions may subsequently be deposited. The resulting pigments show only minimal losses of coercive force during processing into magnetic tapes.

REFERENCES:
patent: 2760876 (1956-08-01), Schalman
patent: 2886460 (1959-05-01), Alexander
patent: 3004859 (1961-10-01), Lichtenwalner

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