Method of producing magnetic coating material for magnetic recor

Details Method of producing magnetic coating material for magnetic recor Method of producing magnetic coating material for magnetic recor

1979-10-11

1981-08-25

Pianalto, Bernard D.

Compositions

Magnetic

With wax, bitumen, resin, or gum

427128, 428900, H01F 100, H01F 126, C04B 3504

Patent

active

042858259

ABSTRACT:
A magnetic coating material for magnetic recording media is produced by dispersing a magnetic coating material containing from 0.1 to 2.0% of an abrasive and from 0.05 to 1.0% of a betaine type ampholytic antistatic agent, both on the basis of the amount of a magnetic powder, in a dispersion mill using steel balls. The abrasive has a hardness of not lower than 6 on Mohs' scale.

REFERENCES:
patent: 3630910 (1971-12-01), Akashi et al.
patent: 3687725 (1972-08-01), Hartmann et al.

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