Kao Corporation

Tsuyoshi Ootani

Tetsuya Imamura

Michihide Yamauchi

Nobuyuki Kishine

Takashi Takeuchi

Chiaki Abe

Junsaku Nakajima

Syoji Kobayashi

Ikuko Wada

Disclosed is a magnetic recording medium having a magnetic layer composed mainly of a magnetic powder and a resin binder, wherein the magnetic layer comprises (a) an ester compound comprising (a-1) an ester compound represented by the following formula (1): ##STR1## wherein R stands for a branched alkyl group having 13 carbon atoms, (a-2) butyl stearate and (a-3) butoxyethyl stearate, and (b) carbon black comprising (b-1) carbon black having an average single particle size of 10 to 50 m.mu. and (b-2) carbon black having an average single particle size of 200 to 1,000 m.mu.. This magnetic recording medium has an excellent durability and is utilized as a floppy disk or the like.

Magnetic recording medium

A magnetic head is disclosed in which a non-magnetic base substance which supports a writing or reading converter for writing or reading on a magnetic recording medium is constructed with an aggregate of carbon material, or a composite material comprising an aggregate of carbon material, and a thermosetting resin and/or a carbonaceous filler.

Magnetic head comprised of an improved base substance for high density

Magnetic recording particles (i) are coated with a reaction product of (ii) an isocyanate compound such as polyisocyanate compounds and isocyanate compounds having a hydrolyzable alkoxysilane group, and (iii) a phosphoric ester of an alkanol, alkenol, alkylene oxide additives thereof or aliphatic carboxylic alkylene oxides.

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Tochigi, Japan

Tsuyoshi Ootani