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US 5,587,217 AGranted
Lubricant composition and method
AssigneeHMT Technology Corporation
InventorsJames L. Chao, Yu-Cheun Lee, Chao Gao
Life of this patent
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Abstract
A thin-film magnetic recording disc for use with a read/write head in a disc drive is disclosed. To reduce the static and dynamic frictional coefficients of the disc surface, the disc is coated with a lubricant layer composed of a mixture of a polyphenoxycyclotriphosphazene lubricant and a perfluoropolyether oil. Also disclosed is a lubricant composition containing these two components, as well as a method for improving the lubricating properties of a perfluoropolyether oil.
Claims9
A thin-film magnetic recording disc for use with a read/write head in a disc drive, comprising
- a substrate,
- a magnetic recording film formed on the substrate,
- a protective overcoat formed on the recording film, and
- an outer lubricant layer comprising a hexaphenoxycyclotriphosphazene lubricant and a perfluoropolyether oil, wherein each phenoxy group in the lubricant, taken separately, is substituted with one or more short chain substituents selected from the group consisting of F, CF.sub.3, OCF.sub.3, CF.sub.2 CF.sub.3, CH.sub.2 CF.sub.3, OCF.sub.2 CF.sub.3, and OCH.sub.2 CF.sub.3,
- and wherein said hexaphenoxycyclotriphosphazene lubricant and perfluoropolyether oil are present in relative proportions effective to provide a significant reduction in frictional drag relative to the reduction in drag provided by the hexaphenoxycyclotriphosphazene lubricant or perfluoropolyether oil alone.
2 more elements
Dependencies are inferred from the claim text.