Abrasive used in magnetic recording medium and production thereo

Details Abrasive used in magnetic recording medium and production thereo Abrasive used in magnetic recording medium and production thereo

1985-01-22

1986-05-20

Pianalto, Bernard D.

Stock material or miscellaneous articles

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

Particulate matter

427128, 427215, 428403, 428404, 428695, 428697, 428900, H01F 1002

Patent

active

045901279

ABSTRACT:
When an abrasive having an oleophilic surface intended for use in magnetic recording media, said abrasive being obtained by subjecting an inorganic powder material having a Mohs hardness of 5 or above and an average particle size of 2 .mu.m or below to a wet contact treatment with an aqueous solution or an organic solvent solution containing a dispersing agent having an oleophilic group and drying the treated powder material, is used together with a magnetic powder material in the magnetic recording layer of a magnetic recording medium, the wear of the magnetic head can be prevented and the still characteristics of the recording medium is improved.

REFERENCES:
patent: 3007807 (1961-11-01), Radocy
patent: 3630910 (1971-12-01), Akashi et al.
patent: 3790407 (1974-02-01), Merten et al.
patent: 3833412 (1974-09-01), Akashi et al.
patent: 3992558 (1976-11-01), Smith-Johanssen
patent: 4153754 (1979-05-01), Huisman
patent: 4191587 (1980-03-01), Kratel
patent: 4275115 (1981-06-01), Haruse
patent: 4320159 (1982-03-01), Ogawa
patent: 4330600 (1982-05-01), Kawasumi et al.
patent: 4334887 (1982-06-01), Frank
patent: 4379809 (1983-04-01), Matsufuji et al.

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