Magnetic recording medium containing an unsaturated fatty acid diester of a dihydric alcohol
AssigneeTDK Corporation
InventorsTakayoshi Kuwajima, Hideki Sasaki
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Abstract
A magnetic recording medium has a magnetic layer on a non-magnetic substrate. The magnetic layer contains ferromagnetic powder dispersed in a binder and a lubricant which is an unsaturated fatty acid diester of a dihydric alcohol and an unsaturated fatty acid, preferably a C.sub.2-6 dihydric alcohol and a C.sub.14-24 unsaturated fatty acid, typically neopentyl glycol dioleate. The lubricant remains effective in low-temperature, high-temperature, and thermal cycling environments without bleed-out. The medium is low in rotational torque, abrasion resistant and durable.
Claims9
A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer thereon, said magnetic layer containing a thermoset or electron-cured resin binder and dispersed therein a ferromagnetic powder and a lubricant, wherein at least 3% by weight of said lubricant comprises an unsaturated fatty acid diester of dihydric alcohol having 2 to 6 carbon atoms and an unsaturated fatty acid having 14 to 24 carbon atoms and 1 to 4 unsaturated bonds.
Dependencies are inferred from the claim text.