Magnetic recording medium
AssigneeHitachi, Ltd.
InventorsHajime Fukke, Motoo Akagi, Yoshiki Kato, Waichi Nagashiro
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Abstract
A sufficient reproduced output can be attained even in a coating thickness of as small as 1 .mu.m, preferably 0.1 to 0.5 .mu.m with a magnetic recording medium comprising a substrate and a coating film containing magnetic powder formed on the substrate, wherein the content of the magnetic powder in the coating film is 66 to 90% by weight.
Claims15
A magnetic recording medium comprising a hard disk as a nonmagnetic substrate and a coating film, the coating film containing magnetic powder and a binder including an epoxy resin, a phenolic resin and a vinyl resin, the coating film having a thickness of less than 0.5 .mu.m and being formed on said substrate, the content of said magnetic powder in said coating film being 66 to 90% by weight based on the total weight of the coating film.
A magnetic recording medium comprising a hard disk as a nonmagnetic substrate and a coating film, the coating film containing magnetic powder and a binder including an epoxy resin, a phenolic resin and a vinyl resin, the coating film having a thickness of less than 0.5 .mu.m and being formed on said substrate, the content of said magnetic powder in said coating film being 66 to 90% by weight based on the total weight of the coating film, whereby the magnetic recording medium is a magnetic hard disk.
A magnetic recording medium comprising a disk as a hard nonmagnetic substrate and a coating film, the coating film containing magnetic powder and a binder including an epoxy resin, a phenolic resin and a vinyl resin, the coating film having a thickness of less than 0.5 .mu.m and being formed on said substrate, the content of said magnetic powder in said coating film being 66 to 90% by weight based on the total weight of the coating film, the content of the vinyl resin in the binder being in the range of 16 to 75% by weight and the content of the total of the epoxy resin and the phenolic resin being in the range of 25 to 84% by weight.
Dependencies are inferred from the claim text.