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US 11,866,548 B2Granted
Perfluoropolyether compound, lubricant, and magnetic disk
AssigneeMoresco Corporation
InventorsRyosuke Sagata, Tsuyoshi Shimizu
Life of this patent
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Abstract
Provided is a compound with which a lubricant having excellent adhesion to a magnetic disk, particularly to a protective layer can be provided. A perfluoropolyether compound in accordance with one aspect of this invention has a structure in which two perfluoropolyethers are bonded to each other through an aliphatic ether, the aliphatic ether including a carbon atom to which a primary alcohol is bonded.
Claims6
A perfluoropolyether compound represented by the following formula (1):
- where:
- a is an integer of 1 to 5;
- R1 is a hydrogen atom, a hydrocarbon group, or a polar group;
- R2 and R3 are each independently —F, —CH2OH, —CH2OCH2CH(OH)CH2OH, —CH2OCH2CH(OH)CH2OCH2CH(OH)CH2OH, —CH2O(CH2)gOH, —CH2OCH2CH(OH)CH2OC12E9O, —CH2OCH2CH(OH)CH2OC10H7, or CH2OCH2CH(OH)CH2OC6H4—R4, where g is a real number of 1 to 10, and R4 is a hydrogen atom, a hydroxyl group, a C1-C4 alkoxy group, an amino group, or an amido group;
- and
- Rf is represented by the following formula (2):
- Rf;(OCF2)b(OCF2CF2)c(OCF2CF2CF2)d(OCF2CF2CF2CF2)e(OCF2CF(CF3))fO (2)
- where:
- b and c are each a real number of 0 to 50;
- d, e, and f are each a real number of 0 to 30;
- and
- at least one of b, c, d, e, and f is a real number of 1 or more.
9 more elements
A perfluoropolyether compound represented by the following formula (3):
- where:
- a is an integer of 1 to 5 and x is a real number of 1 to 5;
- R1 is a hydrogen atom, a hydrocarbon group, or a polar group;
- R2 and R3 are each independently —F, —CH2OH, —CH2OCH2CH(OH)CH2OH, —CH2OCH2CH(OH)CH2OCH2CH(OH)CH2OH, —CH2O(CH2)gOH, —CH2OCH2CH(OH)CH2OC12H9O, —CH2OCH2CH(OH)CH2OC10H7, or CH2OCH2CH(OH)CH2OC6H4—R4, where g is a real number of 1 to 10, and R4 is a hydrogen atom, a hydroxyl group, a C1-C4 alkoxy group, an amino group, or an amido group;
- and
- Rf is represented by the following formula (2):
- Rf;(OCF2)b(OCF2CF2)c(OCF2CF2CF2)d(OCF2CF2CF2CF2)e(OCF2CF(CF3))fO (2)
- where:
- b and c are each a real number of 0 to 50;
- d, e, and f are each a real number of 0 to 30;
- and
- at least one of b, c, d, e, and f is a real number of 1 or more.
9 more elements
Dependencies are inferred from the claim text.