Magnetic disk and magnetic disk unit

Details Magnetic disk and magnetic disk unit Magnetic disk and magnetic disk unit

2011-08-30

2011-08-30

Ruthkosky, Mark (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S834000, C428S835600, C428S835700

Reexamination Certificate

active

08007932

ABSTRACT:
Embodiments of the present invention provide a magnetic disk having a lubricating layer formed on the surface thereof, which meets all the requirements for adhesiveness, adequate flowability, and strong binding power. In a particular embodiment, a magnetic disk has a magnetic layer, a protective layer, and a lubricating layer which are formed on a non-magnetic substrate, which is characterized in that said lubricating layer is comprised of a lubricant containing a first ingredient and a second ingredient, said first ingredient as the main constituent being a first perfluoropolyether compound represented by the formula (1) below, which has a weight-average molecular weight of 500 to 6000 and a dispersity smaller than 1.3, and said second ingredient being a second perfluoropolyether compound which has a weight-average molecular weight of 500 to 6000 and has 6 to 10 hydroxyl groups (on average) in one molecule,in-line-formulae description="In-line Formulae" end="lead"?Rt-Rf1-Rt  (1)in-line-formulae description="In-line Formulae" end="tail"?where, Rf1denotes a perfluoropolyether chain represented by the formula (2) and Rt denotes a terminal group represented by the formula (3),in-line-formulae description="In-line Formulae" end="lead"?—CF2O—[(CF2CF2O)m—(CF2O)n]—CF2—  (2)in-line-formulae description="In-line Formulae" end="tail"?where, m and n each denote a natural number,

REFERENCES:
patent: 2005/0094316 (2005-05-01), Shiramatsu et al.
patent: 2001-052328 (2001-02-01), None
patent: 2006-070173 (2006-03-01), None
patent: 2006070173 (2006-03-01), None

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