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US 4,305,995 AGranted
Magnetic recording medium
AssigneeTDK Electronics Co., Ltd.
InventorsHiroshi Ota, Eiji Horigome, Hitoshi Azegami
Life of this patent
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Abstract
A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder, a thermosettable binder and a mixture of sorbitane mono-, di- and tri- higher fatty acid ester surfactants.
Claims4
A magnetic recording medium which comprises a substrate coated with a magnetic layer comprising a magnetic powder, a thermosettable binder and a mixture of sorbitane mono-, di- and tri- higher fatty acid ester surfactants, the ratio in said mixture being 1:0.2-5:0.2-5, and the ratio of said mixture to said binder being from 1-15 wt.%.
Dependencies are inferred from the claim text.