Tdk Corporation

Shinji Abe

Eiji Horigome

Kiyoto Fukushima

Hiroshi Ohta

Toshikazu Yahata

Yutaka Nakashima

A non-magnetic base film is provided thereon with a magnetic layer having ferromagnetic powders dispersed in a binder. The binder contains 30 to 70% by weight of a polyurethane resin A having a glass transition temperature Tg conforming to 60.degree. C..ltoreq.Tg.ltoreq.80.degree. C., and 30 to 70% by weight of a polyurethane resin B having a glass transition temperature Tg conforming to 0.degree. C.&lt;Tg.ltoreq.30.degree. C. The polyurethane resins A and B, at least one which contains a polar group, account for 80 to 100% by weight of the binder. The magnetic recording medium can be fabricated with an improved processability to calendering, has excellent electromagnetic characteristics, allows detachment of powders from the edge portions in particular to be substantially avoided at normal temperature, and is improved in terms of running stability in a high-temperature environment.

Magnetic recording medium having a magnetic layer comprising

A magnetic recording medium having deposited on the surface of a non-magnetic substrate a magnetic layer formed by dispersing a powdered magnetic substance and a powdered abrasive in a binder, which magnetic recording medium is characterized by having abrasive particles activated on the surface thereof.

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Nagano, Japan

Shinji Abe