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

Patent metadata

Field	Value
Publication number	US-12264290-B2
Application number	US-202118009221-A
Country	US
Kind code	B2
Filing date	Jun 7, 2021
Priority date	Jun 11, 2020
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

What is provided is a fluorine-containing ether compound represented by the following formula.

R 1 —CH 2 —R 2 —CH 2 —OCH 2 CH(OH)CH 2 O—CH 2 —R 3 —CH 2 —R 4

(In the formula, R 2 and R 3 are perfluoropolyether chains, and R 1 and R 4 are terminal groups having two or three polar groups, in which individual polar groups are bound to different carbon atoms and the carbon atoms to which the polar groups are bound are bound to each other via a linking group having a carbon atom to which the polar groups are not bound).

First claim

The invention claimed is:

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

(in Formula (1), R 2 and R 3 consist of perfluoropolyether chains; and —CH 2 —R 1 and —CH 2 —R 4 are represented by Formula (2) below),
—CH 2 —[A]—[B]—OZ  (2),

in Formula (2), [A] is represented by Formula (3) below, [B] is represented by Formula (4) below, Z is H or a group represented by Formula (5) below; [A] and [B] in Formula (2) may be exchanged with each other, and Z is the group represented by Formula (5) below in a case where [A] is directly bound to —OZ, and

in Formula (3), X is an integer of 0 to 2, in Formula (4), Y is an integer of 0 to 1 and a is an integer of 1 to 4; the sum of X in Formula (3) and Y in Formula (4) is 1 or 2; and b in Formula (5) is an integer of 2 to 4.

2. The fluorine-containing ether compound according to claim 1 ,
wherein R 2 and R 3 in Formula (1) above are any of Formulae (6) to (8) below,
—CF 2 O—(CF 2 CF 2 O) c —(CF 2 O) d —CF 2 —  (6)

(in Formula (6), c and d indicate an average degree of polymerization and each represent 0 to 20, provided that c or d is 0.1 or more),
—CF 2 CF 2 O—(CF 2 CF 2 CF 2 O) e —CF 2 CF 2 —  (7)

(in Formula (7), e indicates an average degree of polymerization and represents 0.1 to 20), and
—CF 2 CF 2 CF 2 O—(CF 2 CF 2 CF 2 CF 2 O) f —CF 2 CF 2 CF 2 —  (8)

(in Formula (8), f indicates an average degree of polymerization and represents 0.1 to 10).

3. The fluorine-containing ether compound according to claim 1 , wherein R 1 and R 4 in Formula (1) above each have two polar groups.

4. The fluorine-containing ether compound according to claim 1 , wherein R 1 and R 4 in Formula (1) above are the same as each other.

5. The fluorine-containing ether compound according to claim 1 , wherein R 2 and R 3 in Formula (1) above are the same as each other.

6. The fluorine-containing ether compound according to claim 1 , wherein a number average molecular weight thereof is within 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,
wherein at least a magnetic layer, a protective layer, and a lubricating layer are sequentially provided on a substrate, and
wherein the lubricating layer contains the fluorine-containing ether compound according to claim 1 .

9. The magnetic recording medium according to claim 8 , wherein an average film thickness of the lubricating layer is 0.5 nm to 2.0 nm.

10. The fluorine-containing ether compound according to claim 1 , wherein the number of polar groups in R 1 is the same as the number of polar groups in R 4 .

Assignees

• Showa Denko Kk
• Resonac Corp

Inventors

• SHIBATA Natsumi
• Fukumoto Naoya
• Kato Tsuyoshi

Classifications

• C10N2040/18

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

• C10M2213/043

  used as base material · CPC title

• C08G65/3318 Primary

  heterocyclic · CPC title

• C08G65/226

  containing fluorine · CPC title

• C07C43/137

  containing halogen · CPC title