Magnetic recording medium
AssigneeKao Corporation
InventorsTsuyoshi Ootani, Junsaku Nakajima, Chiaki Abe, Ikuko Wada
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Abstract
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.
Claims5
A magnetic recording medium having a magnetic layer composed mainly of a magnetic powder and a resin binder, wherein said magnetic layer comprises
- (a) an ester compound comprising (a-1) a compound represented by the following formula (1):
- ##STR3## wherein R stands for a branched alkyl group having 13 carbon atoms which may be partially substituted with an unbranched alkyl group having 13 carbon atoms, (a-2) butyl stearate and (a-3) butoxyethyl stearate, wherein the amounts of a-1, a-2 and a-3 are 20 to 80 parts by weight, 10 to 40 parts by weight, and 20 to 80 parts by weight, respectively per 100 parts by weight of the sum of a-1, a-2 and a-3;
- and
- (b) carbon black comprising (b-1) carbon black having an average single particle size of 10 to 50m.mu. and (b-2) carbon black having an average single particle size of 200 to 1,000m.mu.;
- and
- wherein said ester compound is in an amount of 1 to 15% by weight based on the weight of said magnetic powder
Dependencies are inferred from the claim text.