Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium

Patent metadata

Field	Value
Publication number	US-11279664-B2
Application number	US-201716082349-A
Country	US
Kind code	B2
Filing date	Jan 30, 2017
Priority date	Mar 10, 2016
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

The present invention relates to a fluorine-containing ether compound represented by Formula (1),R1—R2—CH2—R3—CH2—R4  (1).(In Formula (1), R1 is an end group including an organic group having at least one double bond or triple bond, R2 is a divalent linking group bonded to R1 by etheric oxygen, R3 is a perfluoropolyether chain, R4 is an end group having two or three polar groups with each polar group being bonded to different carbon atoms, and the carbon atoms, to which the polar groups are bonded, being bonded to each other via a linking group including carbon atoms to which the polar groups are not bonded.)

First claim

What is claimed is:

1. A fluorine-containing ether compound represented by Formula (1),
R 1 —R 2 —CH 2 —R 3 —CH 2 —R 4   (1)

(in Formula (1), R 1 is an end group including an organic group having at least one double bond or triple bond and is any one of an end group including an aromatic ring, an end group including a heterocyclic ring, an end group including an alkenyl group, and an end group including an alkynyl group, R 2 is a divalent linking group bonded to R 1 by etheric oxygen, R 3 is a perfluoropolyether chain, R 4 is an end group of any one of Formula (2-1) to (2-4)

(in Formula (2-1), p1 represents 1 to 2, and p2 represents 1 to 5)

(in Formula (2-2), s represents 2 to 5)

(in Formula (2-3), t represents 1 to 5)

(in Formula (2-4), q represents 2 to 5).

2. The fluorine-containing ether compound according to claim 1 ,
wherein R 3 in Formula (1) is represented by Formula (3)11.11

(in Formula (3), in represents 1 to 30, and n represents 0 to 30).

3. The fluorine-containing ether compound according to claim 1 ,
wherein R 3 in Formula (1) is represented by Formula (4) or Formula (5)

(in Formula (4), u represents 1 to 30)

(in Formula (5), v represents 1 to 30).

4. The fluorine-containing ether compound according to claim 1 ,
wherein=R 2 in Formula (1) is represented by —O— or Formula (6)

(in Formula (6), w represents 1 to 4).

5. The fluorine-containing ether compound according to claim
wherein R 4 in Formula (1) includes three hydroxyl groups.

6. The fluorine-containing ether compound according to claim 1 , having a number average molecular weight in a range of 500 to 10,000.

7. A lubricant for a magnetic recording medium comprising:
the fluorine-containing ether compound according to claim 1 .

8. A magnetic recording medium comprising:
at least a magnetic layer;
a protective layer; and
a lubricating layer, which are sequentially provided on a substrate,
wherein the lubricating layer includes the fluorine-containing ether compound according to claim 1 .

9. The magnetic recording medium according to claim 8 ,
wherein an average thickness of the lubricating layer is 0.5 nm to 3 nm.

10. The fluorine-containing ether compound according to claim 1 , wherein R 2 in Formula (1) is —O— or a divalent linking group having 1 to 20 carbon atoms.

Assignees

• Showa Denko Kk

Inventors

• Yagyu Daisuke
• Yamaguchi Yuta
• Fukumoto Naoya
• Kato Tsuyoshi
• UETAKE Shoko
• Tomita Hiroyuki
• MIYASAKA Ryuuta
• Ito Naoko
• Ota Ichiro
• Murofushi Katsumi

Classifications

• G11B5/7257

  Perfluoropolyether lubricant · CPC title

• C07D303/26

  having one or more free hydroxyl radicals · CPC title

• C10N2050/025

  in the form of films or sheets · CPC title

• C07C43/23 Primary

  containing hydroxy or O-metal groups · CPC title

• C10N2040/18

  in connection with recordings on magnetic tape or disc · CPC title