MAGNETIC DISK AND METHOD FOR MANUFACTURING THE MAGNETIC DISK

WIPO Patent Application WO/2010/038773

A1

Disclosed is a magnetic disk that has high durability, particularly high LUL durability and CFT properties and can exhibit high reliability under a low-levitation level of a magnetic head due to a rapid increase in recording density in recent years and under very high environmental tolerance required due to diversification of applications. The magnetic disk comprises a substrate and at least a magnetic layer, a carbonaceous protective layer, and a lubricating layer provided in this order on the substrate.  The lubricating layer is formed of a lubricating agent that contains two types of compounds having a perfluoropolyether main chain in the structure.  The molecular weight distribution of the whole two types of compounds is in the range of 1 to 1.2.  The two types of compounds include a compound (a) having a hydroxyl group at an end thereof and a compound (b) having a number average molecular weight that is smaller than the number average molecular weight of the compound (a) and is not more than 1500.  The content of the compound (b) in the two types of compounds is not more than 10%.

SHIMOKAWA KOICHI (JP)
HAMAKUBO KATSUSHI (JP)
ITOH KAE (JP)

PCT/JP2009/067022

April 08, 2010

September 30, 2009

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HOYA CORP (JP)
HOYA MAGNETICS SINGAPORE PTE (SG)
SHIMOKAWA KOICHI (JP)
HAMAKUBO KATSUSHI (JP)
ITOH KAE (JP)

G11B5/725; C10M107/38; G11B5/84; C10N20/04; C10N30/00; C10N30/06; C10N40/18

JP2001052327A	2001-02-23
JP2003288715A	2003-10-10
JP2001229524A	2001-08-24
JP2001052328A	2001-02-23
JPH04168621A	1992-06-16
JPH0210518A	1990-01-16

OTSUKA TAKEFUMI (JP)
Takeshi Otsuka (JP)

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