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Title:
LUBRICANT FOR MAGNETIC DISK, PROCESS FOR PRODUCING THE SAME, AND MAGNETIC DISK
Document Type and Number:
WIPO Patent Application WO/2008/038799
Kind Code:
A1
Abstract:
A lubricant for magnetic disks which can form a lubricating layer having a reduced thickness while attaining a high coverage and is excellent in heat resistance and adhesion to a protective layer. The lubricant for magnetic disks comprises a perfluoropolyether compound in which the relationship between the number-average molecular weight and the standardized value of the number of hydroxy groups contained in the molecule satisfies the following: the number-average molecular weight is in the range of 1,000-6,000; the standardized value of the number of hydroxy groups contained in the molecule is 180 or higher; and the compound is in a region located below the line connecting the point where the number-average molecular weight is 1,000 and the standardized value of the number of hydroxy groups in the molecule is 400 to the point where the number-average molecular weight is 6,000 and the standardized value of the number of hydroxy groups in the molecule is 1,600. The compound has at least one hydroxy group around the center of the molecular chain.

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Inventors:
HAMAKUBO KATSUSHI (JP)
SHIMOKAWA KOICHI (JP)
SUZUKI KOTA (JP)
Application Number:
PCT/JP2007/069088
Publication Date:
April 03, 2008
Filing Date:
September 28, 2007
Export Citation:
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Assignee:
HOYA CORP (JP)
HAMAKUBO KATSUSHI (JP)
SHIMOKAWA KOICHI (JP)
SUZUKI KOTA (JP)
International Classes:
C10M107/38; C10M171/00; G11B5/725; C10N30/00; C10N30/06; C10N40/18; C10N50/02
Foreign References:
JP2003162810A2003-06-06
JP2006070173A2006-03-16
JPH07141645A1995-06-02
JP2006059491A2006-03-02
JP2004095163A2004-03-25
JP2004095094A2004-03-25
Attorney, Agent or Firm:
OTSUKA, Takefumi (Ginza Chuo Bldg.1-20, Tsukiji 4-chom, Chuo-ku Tokyo 45, JP)
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