Process for preparing a backing layer of a magnetic recording me

Details Process for preparing a backing layer of a magnetic recording me Process for preparing a backing layer of a magnetic recording me

1990-10-30

1991-08-13

Cashion, Jr., Merrell C.

Coating processes

Magnetic base or coating

Magnetic coating

428323, 428336, 4284259, 428694, 428900, G11B 2300

Patent

active

050395548

ABSTRACT:
A process for preparing a magnetic recording medium by the steps of (a) forming a magnetic layer on one surface of a non-magnetic support and (b) homogeneously dispersing an .alpha.-Al.sub.2 O.sub.3 power having an average particle size of about 0.1 .mu.m or less in a solvent containing a small amount of binder to form a dispersion, mixing the thus-prepared dispersion with a binder to provide a coating composition, and applying the coating composition to the opposite surface of the nonmagnetic support to form a backing layer. The magnetic recording medium has improved wear resistance, a low friction coefficient and excellent electromagnetic properties.

REFERENCES:
patent: 4328935 (1982-05-01), Steel
patent: 4414270 (1983-11-01), Miyoshi et al.
patent: 4474843 (1984-10-01), Miyoshi et al.
patent: 4567063 (1986-01-01), Miyoshi et al.
patent: 4612244 (1986-09-01), Kaneda et al.
patent: 4761243 (1988-08-01), Kakuishi et al.

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