Magnetic recording disk and method for manufacture thereof

Details Magnetic recording disk and method for manufacture thereof Magnetic recording disk and method for manufacture thereof

2006-09-28

2011-11-22

Ruthkosky, Mark (Department: 1727)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C508S582000

Reexamination Certificate

active

08062778

ABSTRACT:
In order to obtain a magnetic recording disk that exhibits high reliability even if the flying height of a magnetic head becomes very narrow, a lubricant is specified in terms of both molecular structure and quantitative data. That is, a lubricating layer14of the magnetic recording disk1is formed by a lubricant which contains perfluoropolyether compounds represented by the following chemical formula (Chemical Formula 1) and which has a first component content of 71.7%, a second component content of 15.7%, a third component content of 11.7%, a fourth component content of 0.3%, and a fifth component content of 0.6%:in-line-formulae description="In-line Formulae" end="lead"?X—OCH2CF2—(CF2O)m(C2F4O)n—CF2OCH2O—X  (Chemical Formula 1)in-line-formulae description="In-line Formulae" end="tail"?m, n=9 to 11first component: X=X1=CH2CH(OH)CH2OHsecond component: X=X2=CH2CH(OH)CH2OCH2CH(OH)CH2OHthird component: X=X3=Hfourth component: X=X4=CF3fifth component: X=X5=CF2Cl.

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