Lubricant compound for magnetic disk and magnetic disk
AssigneeWD Media (Singapore) Pte. Ltd.
InventorsKota Suzuki, Koichi Shimokawa, Katsushi Hamakubo, Kae Itoh
Life of this patent
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Abstract
A lubricant compound is contained in a lubrication layer of a magnetic disk in which at least a magnetic layer, a protective layer, and a lubrication layer are sequentially provided on a substrate, and the lubricant compound contains a component A represented by Chemical formula 1 and a component B represented by Chemical formula 2: wherein X in Chemical formula 1 represents OH wherein X in Chemical formula 2 represents OCH2CH(OH)CH2OH, and the lubricant compound further contains a component C made of a specific compound having a phosphezene ring in the structure thereof.
Claims7
A lubricant compound for a magnetic disk contained in a lubrication layer of a magnetic disk in which at least a magnetic layer, a protective layer, and a lubrication layer are sequentially provided on a substrate, characterized in that
- the lubricant compound contains a component A represented by Chemical formula 1 and a component B represented by Chemical formula 2:
- wherein X in Chemical formula 1 represents OH
- wherein X in Chemical formula 2 represents OCH2CH(OH)CH2OH,
- and the lubricant compound further contains at least one type of a component C, wherein the component C is selected from compounds C-1 and C-2 represented by the following formulae:
- wherein Rf represents —(OC2F4)m(OCF2)n-, and m and n each represents an integer of not less than 1, and
- PN is represented from one of the following formulae:
- wherein x and y each is an integer of 5 when C is compound (C-1) and an integer of 4 when C is compound (C-2),
- wherein the lubricant compound does not contain a component D represented by the following Chemical formula
Dependencies are inferred from the claim text.