Process for producing a magnetic recording medium

Details Process for producing a magnetic recording medium Process for producing a magnetic recording medium

1988-05-02

1989-03-14

Pianalto, Bernard

Coating processes

Magnetic base or coating

Magnetic coating

428900, H01F 1002

Patent

active

048123307

ABSTRACT:
A process for producing a magnetic recording medium is disclosed, which comprises uniformly dispersing an .alpha.-Al.sub.2 O.sub.3 powder having a particle size of not greater than 0.1 .mu.m in a dispersion medium to obtain a dispersion, adding the dispersion to a coating composition for a magnetic layer essentially comprising a binder and a ferromagnetic powder having a specific surface area of not less than about 40 m.sup.2 /g, further dispersing the mixture to prepare a coating composition for a magnetic layer, and coating the resulting coating composition on a nonmagnetic support to obtain a magnetic layer having a dry thickness of about 2 .mu.m or less. The resulting magnetic recording medium exhibits excellent electromagnetic characteristics and improved abrasion resistance.

REFERENCES:
patent: 3687725 (1972-08-01), Hartmann et al.

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