Precipitated alumina for use in magnetic recording disc media

Details Precipitated alumina for use in magnetic recording disc media Precipitated alumina for use in magnetic recording disc media

1981-04-16

1983-09-13

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

428329, 428336, 428694, 428900, H01F 1002

Patent

active

044042388

ABSTRACT:
A magnetic recording medium and method of producing the same are taught. The medium comprises magnetic particles and alumina particles dispersed in a binder as a unitary coating whereby each of the alumina particles disposed in the binder is substantially equal to the thickness of the medium wherein the alumina particles are produced by first forming an aluminum hydrate from alumina hydrate gel according to the following equation:

REFERENCES:
patent: 3214379 (1965-10-01), Lindquist
patent: 3622386 (1971-11-01), Larsen
patent: 3843404 (1974-10-01), Haefele et al.

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