Magnetic recording medium
AssigneeTDK Corporation
InventorsOsamu Kohmoto, Yasufumi Takasugi, Hiroshi Sugihara, Masaharu Nishimatsu
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Abstract
A magnetic recording medium for use in video and other applications is presented which comprises a substrate, a continuous thin magnetic layer of cobalt and at least one selected from nickel, chromium, and oxygen, preferably obliquely evaporated on the substrate, and a topcoat formed over the magnetic layer and made of a phosphate compound having the formula: ##STR1## where R is selected from alkyl radicals having 10 to 22 carbon atoms, and Y and Y' are independently selected from the group consisting of hydrogen atom, alkyl radicals and monovalent cations, and Y and Y' may together represent a divalent cation.
Claims21
A magnetic recording medium comprising a substrate, a continuous thin magnetic layer on the substrate, and a topcoat formed over the magnetic layer deposited by evaporation or sputtering, characterized in that the topcoat consists of a compound having the formula:
- ##STR6## where R is selected from alkyl radicals having 10 to 22 carbon atoms, and Y and Y' are independently selected from the group consisting of hydrogen atom, alkyl radicals and monovalent cations, and Y and Y' may together represent a divalent cation.
Dependencies are inferred from the claim text.