Stabilization of chromium dioxide magnetic pigments

Details Stabilization of chromium dioxide magnetic pigments Stabilization of chromium dioxide magnetic pigments

1977-05-20

1979-12-04

Pianalto, Bernard D.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

427127, 427128, 428900, H01F 1002

Patent

active

041773179

ABSTRACT:
Chromium dioxide magnetic pigments can be stabilized against the loss of their magnetic properties by treating them, in alcoholic aqueous suspension, with a silane or a hydrolysis product thereof, so that when the pigment is isolated from the suspension medium the particles bear at least partially hydrolyzed silane on their surfaces, and then drying the magnetic pigment at from 50.degree. to 200.degree. C.

REFERENCES:
patent: 3258382 (1966-06-01), Vincent
patent: 4007313 (1977-02-01), Higuchi et al.

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