IP Library › Granted Patent US 8,980,450
Granted Patent B2
US 8,980,450 · App. 14/168,390 · Granted Mar 17, 2015

Lubricant and magnetic disk

Inventor: Nagayoshi Kobayashi (Hyogo, JP)
Assignee: MORESCO Corporation
G11B5/725C08G65/007C08G2650/48C08L71/02C10M105/54C10M107/38C10M2211/0425C10M2213/043C10M2213/0606C10N2220/021C10N2230/06C10N2230/10C10N2240/204C10N2250/121
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Quick Facts
Patent No.
US 8,980,450
App. No.
14/168,390
Granted
Mar 17, 2015
Kind
B2
Abstract

A lubricant containing a compound (A) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a polar group at each of opposite terminals thereof, and a compound (B) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a nonpolar group at at least one terminal thereof —(CF 2 CF 2 CF 2 O) a -  (1) wherein a is a real number of 5 to 30.

Claims (5)

1. A magnetic disk having at least a recording layer and a protective layer formed on a substrate, and a lubricant layer over a surface thereof, the magnetic disk having a lubricant layer comprising a compound (A) and, a lubricant layer comprising a compound (B),

wherein the compound (A) is

and wherein s is 11 or 23, and

wherein the compound (B) is

and wherein q is 12.

Priority Claims (1)
JP 2007-299451 · Nov 19, 2007 · national
Continuity (2)
Division 12734699
Related Publication 20140147699A1 · May 29, 2014