Tdk Electronics Company, Limited

Masahiro Takizawa

Yoshio Kawakami

Noribumi Kajimoto

Takehisa Ohkawa

Kuniichi Shinomiya

In a magnetic recording medium having a coating for magnetic recording formed on one side of the base and a back coating on the opposite side, the back coating consists of a nonmagnetic powder dispersed in a binder which is a combination of nitrocellulose, vinyl chloride-vinyl acetate copolymer, polyurethane, and an isocyanate compound.

Magnetic recording medium

A magnetic recording medium is provided which is assured of smoothly and stably running properties and is free of the so-called 'squeal' phenomenon, especially in an environment of high temperature and high humidity. A highly viscous silicone oil having a viscosity of 100,000 or more is incorporated as a lubricating agent in the magnetic coating of the magnetic recording medium in an amount of 0.5 to 2% by weight based on binder. Such silicone oil is a dimethyl silicone oil having the following rational formula: ##STR1## where n is a number which determines a viscosity thereof.

In a magnetic recording medium having a base, a coating for magnetic recording formed on one side of the base, and a back coating of a nonmagnetic powder dispersed in a binder containing a thermosetting resin and formed on the other side, the back coating contains a fatty acid and/or a fatty ester.

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Saku, Japan

Masahiro Takizawa