Perfluoropolyether compound, lubricant, and magnetic disk

Patent metadata

Field	Value
Publication number	US-11866548-B2
Application number	US-202017629165-A
Country	US
Kind code	B2
Filing date	Jun 29, 2020
Priority date	Jul 26, 2019
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

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.

First claim

The invention claimed is:

1. A perfluoropolyether compound represented by the following formula (1):

where:
a is an integer of 1 to 5;
R 1 is a hydrogen atom, a hydrocarbon group, or a polar group;
R 2 and R 3 are each independently —F, —CH 2 OH, —CH 2 OCH 2 CH(OH)CH 2 OH, —CH 2 OCH 2 CH(OH)CH 2 OCH 2 CH(OH)CH 2 OH, —CH 2 O(CH 2 ) g OH, —CH 2 OCH 2 CH(OH)CH 2 OC 12 E 9 O, —CH 2 OCH 2 CH(OH)CH 2 OC 10 H 7 , or CH 2 OCH 2 CH(OH)CH 2 OC 6 H 4 —R 4 , where g is a real number of 1 to 10, and R 4 is a hydrogen atom, a hydroxyl group, a C 1 -C 4 alkoxy group, an amino group, or an amido group; and
Rf is represented by the following formula (2):
Rf;(OCF 2 ) b (OCF 2 CF 2 ) c (OCF 2 CF 2 CF 2 ) d (OCF 2 CF 2 CF 2 CF 2 ) e (OCF 2 CF(CF 3 )) f O  (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.

2. A lubricant comprising the perfluoropolyether compound recited in claim 1 .

3. 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 the lubricant recited in claim 2 .

4. 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;
R 1 is a hydrogen atom, a hydrocarbon group, or a polar group;
R 2 and R 3 are each independently —F, —CH 2 OH, —CH 2 OCH 2 CH(OH)CH 2 OH, —CH 2 OCH 2 CH(OH)CH 2 OCH 2 CH(OH)CH 2 OH, —CH 2 O(CH 2 ) g OH, —CH 2 OCH 2 CH(OH)CH 2 OC 12 H 9 O, —CH 2 OCH 2 CH(OH)CH 2 OC 10 H 7 , or CH 2 OCH 2 CH(OH)CH 2 OC 6 H 4 —R 4 , where g is a real number of 1 to 10, and R 4 is a hydrogen atom, a hydroxyl group, a C 1 -C 4 alkoxy group, an amino group, or an amido group; and
Rf is represented by the following formula (2):
Rf;(OCF 2 ) b (OCF 2 CF 2 ) c (OCF 2 CF 2 CF 2 ) d (OCF 2 CF 2 CF 2 CF 2 ) e (OCF 2 CF(CF 3 )) f O  (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.

5. A lubricant comprising the perfluoropolyether compound recited in claim 4 .

6. 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 the lubricant recited in claim 5 .

Assignees

• Moresco Corp

Inventors

• Sagata Ryosuke
• Shimizu Tsuyoshi

Classifications

• C08G65/007 Primary

  containing fluorine · CPC title

• C10M105/54 Primary

  containing carbon, hydrogen, halogen and oxygen · CPC title

• C10M107/34

  Polyoxyalkylenes · CPC title

• C10M107/38

  containing halogen · CPC title

• G11B5/7257

  Perfluoropolyether lubricant · CPC title