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US 12,110,470 B2Granted
Perfluoropolyether compound, lubricant and magnetic disk
AssigneeMoresco Corporation
InventorsTomomi Hatta, Tsuyoshi Shimizu
Life of this patent
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Abstract
Provided are a magnetic disk and, in particular, a compound which makes it possible to realize a lubricant having excellent heat resistance and solubility in a fluorine-based solvent. A perfluoropolyether compound in accordance with an aspect of the present invention has, in hydrocarbon groups at both terminals thereof, five or six hydroxyl groups in total.
Claims5
A lubricant comprising:
- a perfluoropolyether compound represented by the following formula (1):
- R1—CH2—R2—CH2—R3 (1)
- wherein:
- R1 is HOCH2CH(OH)CH2OCH2CH(OH)CH2O—;
- R2 is —(CF2)xO(CF2CF2CF2O)m(CF2)x—, wherein x is a real number of 1 to 3, m is a real number of 1 to 15;
- and
- R3 is —OCH2CH(OH)CH2OH or —OCH2CH(OH)CH2OCH2CH(OH)CH2OH,
- wherein at a temperature of 550° C., from heating at a rate of temperature rise of 2° C./min under a nitrogen atmosphere, the lubricant exhibits a 50% weight reduction temperature of higher than 280° C.
5 more elements
A magnetic disk comprising:
- a recording layer;
- a protective layer disposed on the recording layer;
- and
- a lubricant layer disposed on the protective layer,
- the lubricant layer containing a perfluoropolyether compound represented by the following formula (1):
- R1—CH2—R2—CH2—R3 (1)
- wherein:
- R1 is HOCH2CH(OH)CH2OCH2CH(OH)CH2O—;
- R2 is —(CF2)xO(CF2CF2CF2O)m(CF2)x—, wherein x is a real number of 1 to 3, m is a real number of 1 to 15;
- and
- R3 is —OCH2CH(OH)CH2OH or —OCH2CH(OH)CH2OCH2CH(OH)CH2OH.
8 more elements
A lubricant composition comprising:
- a fluorine-based solvent and a perfluoropolyether compound represented by the following formula (1):
- R1—CH2—R2—CH2—R3 (1)
- wherein:
- R1 is HOCH2CH(OH)CH2OCH2CH(OH)CH2O—;
- R2 is —(CF2)xO(CF2CF2CF2O)m(CF2)x—, wherein x is a real number of 1 to 3, m is a real number of 1 to 15;
- and
- R3 is —OCH2CH(OH)CH2OH or —OCH2CH(OH)CH2OCH2CH(OH)CH2OH.
4 more elements
Dependencies are inferred from the claim text.