Fluoropolyether compound, lubricant, and magnetic disk

Patent metadata

Field	Value
Publication number	US-11866550-B2
Application number	US-202217863602-A
Country	US
Kind code	B2
Filing date	Jul 13, 2022
Priority date	Jul 16, 2021
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

Provided are a fluoropolyether compound having high heat resistance and capable of maintaining a surface protection layer even under high temperature, and a lubricant and a magnetic disk that contain the fluoropolyether compound. The fluoropolyether compound includes: three groups whose main chain contains a perfluoropolyether chain; and a trivalent linking group represented by Formula (1) below, the three groups being bound together via the trivalent linking group:

where R 1 is a saturated hydrocarbon group having 1 to 3 carbon atoms, a perfluoroalkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, a hydroxyl group, or an amino group, and A 1 , A 2 , and A 3 are each independently an aromatic group.

First claim

The invention claimed is:

1. A fluoropolyether compound represented by a Formula below:

where R 1 is a saturated hydrocarbon group having 1 to 3 carbon atoms, a perfluoroalkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, a hydroxyl group, or an amino group, and A 1 , A 2 , and A 3 are each independently a phenylene group, a naphthylene group, a biphenyl group, or a diphenyl ether group, and
each —(CF 2 ) a — is independently a linear of branched perfluoroalkylene group, each a is independently a real number of 1 to 3, and
Rf is represented by Formula (4) below:
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 )) r   (4)

where b, c, d, e, and f are independently real numbers of 0 to 21 for each Rf, and at least any one of b, c, d, e, and f is a real number of not less than 1,
R 2 , R 3 , and R 4 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 6 H 4 OC 6 H 5 , CH 2 OCH 2 CH(OH)CH 2 OC 10 H 7 , CH 2 OCH 2 CH(OH)CH 2 OC 6 H 4 —R 5 , CH 2 OCH 2 CH(OH)CH 2 O(CH 2 ) h OC 6 H 4 —O(CH 2 ) h OH, or CH 2 OCH 2 CH(OH)CH 2 (OCH 2 CH 2 ) i OC 6 H 4 (OCH 2 CH 2 ) i OH, R 5 is hydrogen, and alkoxy group having 1 to 4 carbon atoms, an amino group, a hydroxyl group, or an amide group, g and i are each independently a real number of 1 to 3, and each h is independently a real number of 1 to 6.

2. The fluoropolyether compound according to claim 1 , wherein the fluoropolyether compound is represented by Formula (3) below:

3. A lubricant comprising the fluoropolyether compound according to claim 1 .

4. 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 according to claim 3 .

Assignees

• Moresco Corp

Inventors

• Honda Tomoko
• Sagata Ryosuke

Classifications

• C08G65/007 Primary

  containing fluorine · CPC title

• C10M107/38

  containing halogen · CPC title

• C10M177/00

  Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes · CPC title

• G11B5/7257

  Perfluoropolyether lubricant · CPC title

• C10M2213/0606

  used as base material · CPC title