Method to refine lubricant for a magnetic recording medium

Details Method to refine lubricant for a magnetic recording medium Method to refine lubricant for a magnetic recording medium

2007-04-03

2007-04-03

Anthony, Joseph D. (Department: 1714)

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Processes of purifying or recovering used lubricant...

C508S582000, C428S825100, C428S835800

Reexamination Certificate

active

10620773

ABSTRACT:
A method refines a lubricant comprising a compound having a perfluoropolyether structure via supercritical extraction. A lubricant is refined using the method and a magnetic recording medium that utilizes the refined lubricant. The refined lubricant exhibits excellent lubrication performance and long term stability in the magnetic recording medium. In one embodiment of the supercritical extraction, the lubricant contacts an extracting medium of supercritical carbon dioxide under a predetermined condition in a pressure vessel to remove ionic impurities and perfluoropolyether compounds having a weak polarity terminal group contained in the lubricant.

REFERENCES:
patent: 6099937 (2000-08-01), Gui et al.
patent: 6911420 (2005-06-01), Osawa et al.
patent: 2003/0100454 (2003-05-01), Osawa et al.
patent: 05-020673 (1993-01-01), None
patent: 05-049806 (1993-03-01), None
patent: 11-199882 (1999-07-01), None
patent: 2001-164279 (2001-06-01), None
patent: 2001-229524 (2001-08-01), None
Machine Translation of JP 2001-164279, Kato Kazuaki, publication date Jun. 19, 2001.
“Fomblin Z Derivatives” Product Data Sheet by Solvay Solexis, Inc, Dec. 13, 2002.

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