Victor Company of Japan, Limited

Kazuhiro Takeda

Osamu Kobayashi

Kuniharu Fujiki

Shigeru Nakano

Kenichi Kikuchi

Isao Sasaki

Masamichi Saito

Magnetic paint for producing a magnetic recording medium, the magnetic paint comprises at least ferromagnetic powder, binder, .alpha.-Fe.sub.2 O.sub.3 powder, and alumina powder. A relationship between an additive amount (A) of the .alpha.-Fe.sub.2 O.sub.3 powder and an additive amount (B) of the alumina powder is 5.ltoreq.(A+B).ltoreq.25 weight-parts referred to 100 weight-parts of the ferromagnetic powder and 1.ltoreq.A/B.ltoreq.9. The binder comprises polyurethane resin containing metal base sulfonic acid and tertiary amine as major ingredients.

Magnetic recording medium and magnetic paint therefor

A magnetic recording medium comprising an undercoat layer formed on one side or both sides of a non-magnetic substrate and a magnetic layer formed on the undercoat layer, characterized in that the undercoat layer contains powders having an average particle size of 0.5 to 5.0 .mu.m and an aspect ratio of 5.0 or more and a magnetic recording medium comprising a magnetic layer formed on a non-magnetic substrate, characterized in that the non-magnetic substrate contains powders having an average particle size of 0.5 to 5.0 .mu.m and an aspect ratio of 5.0 or more.

Magnetic recording medium

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Mito, Japan

Kazuhiro Takeda