Tdk Corporation

Kiyoto Kanazawa

Akihiko Hosaka

Kiyotaka Okuyama

A magnetic recording medium is composed of a substrate coated with a magnetic layer comprising a magnetic powder and a binder, wherein the binder comprises from 20 to 60% by weight of a polyurethane resin, from 20 to 60% by weight of an epoxy resin, from 15 to 55% by weight of a vinyl chloride-vinyl acetate copolymer resin and a polyisocyanate.

Magnetic recording medium

A magnetic recording medium comprises a magnetic layer coated on a substrate and composed of ferromagnetic metal or alloy powder dispersed in a binder, wherein the magnetic layer contains Al.sub.2 O.sub.3 having an average particle size of at most 1 .mu.m and an .alpha.-form rate of from 60 to 90%.

A process for producing a magnetic recording medium, which comprises dispersing a ferromagnetic powder in a binder to form a magnetic coating composition and applying the magnetic coating composition onto a film base support to form a magnetic layer thereon, wherein corona discharge treatment is applied after the application and drying the magnetic coating composition on the film base support.

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Tokyo, Japan

Kiyoto Kanazawa