Magnetic disk and method of manufacturing same

Details Magnetic disk and method of manufacturing same Magnetic disk and method of manufacturing same

2006-09-12

2006-09-12

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C427S130000, C427S131000

Reexamination Certificate

active

07105241

ABSTRACT:
Disclosed is a method of manufacturing magnetic disks, comprising a magnetic layer, a protective layer, and a lubricating layer on a substrate. In the process, a lubricant alpha comprising a compound denoted by chemical formulain-line-formulae description="In-line Formulae" end="lead"?HO—CH2—CH(OH)—CH2—O—CH2—CF2(—O—C2F4)p-(O—CF2)q-O—CF2—CH2—O—CH2—CH(OH)—CH2—OHin-line-formulae description="In-line Formulae" end="tail"?wherein p and q are natural number,and a compound denoted by chemical formulain-line-formulae description="In-line Formulae" end="lead"?HO—CH2—CF2(—O—C2F4)m-(O—CF2)n-O—CF2—CH2—OHin-line-formulae description="In-line Formulae" end="tail"?wherein m and n are natural number,is fractionated by molecular weight to prepare a lubricant a having a weight average molecular weight (Mw) of from 3,000 to 7,000 and a molecular weight dispersion of less than or equal to 1.2;a lubricant beta comprising a compound denoted by the chemical formulain-line-formulae description="In-line Formulae" end="lead"?HO—CH2—CF2(—O—C2F4)m-(O—CF2)n-O—CF2—CH2—OHin-line-formulae description="In-line Formulae" end="tail"?wherein m and n are natural number,is fractionated by molecular weight to prepare a lubricant b having a weight average molecular weight (Mw) of from 2,000 to 5,000 and a molecular weight dispersion of less than or equal to 1.2;a lubricant c comprising a mixture of lubricants a and b is prepared; anda film of lubricant c is formed on a protective layer provided on a substrate to form a lubricating layer. A magnetic disk comprising a magnetic layer, a protective layer, and a lubricating layer on a substrate, in which the lubricating layer has been formed on the protective layer is also enclosed.

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English language Abstract of JP 62-66417.
English language Abstract of JP 09-282642.
English language Abstract of JP 10-143838.
English language Abstract of JP 201-52327.
English language Abstract of JP 2002-25046.

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