Magnetic pigments with improved orientability and a process...

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

C - Chemistry, Metallurgy

09

C

31/133

C09C 1/24 (2006.01) C01G 49/02 (2006.01) G11B 5/706 (2006.01)

Patent

CA 1039049

MAGNETIC PIGMENTS WITH IMPROVED ORIENTABILITY AND A PROCESS FOR THEIR PRODUCTION 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.

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