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

Patent metadata

Field	Value
Publication number	US-11225624-B2
Application number	US-201816643989-A
Country	US
Kind code	B2
Filing date	Aug 7, 2018
Priority date	Sep 7, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

A fluorine-containing ether compound represented by Formula (1) is provided,R1—R2—CH2—R3—CH2—R4  (1)(In Formula (1), R1 is an alkyl group that may have a substituent, R2 is a divalent linking group bonded to R1 via an ethereal oxygen, R3 is a perfluoropolyether chain, and R4 is an end group which is different from R1-R2 and includes two or three polar groups, in which each of the polar groups is bonded to a different carbon atom, and the carbon atoms bonded to the polar groups are bonded to each other via a linking group containing a carbon atom not bonded to the polar groups.).

First claim

The invention 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 alkyl group that may have a substituent, R 2 is represented by —O— or Formula (6)

(in Formula (6), w represents 1 to 4), R 3 is a perfluoropolyether chain, and R 4 is an end group which is different from R 1 -R 2 and includes two or three polar groups, in which each of the polar groups is bonded to a different carbon atom, and the carbon atoms bonded to the polar groups are bonded to each other via a linking group containing a carbon atom not bonded to the polar groups).

2. The fluorine-containing ether compound according to claim 1 ,
wherein the polar groups of R 4 in Formula (1) are hydroxyl groups.

3. 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 alkyl group that may have a substituent, R 2 is a divalent linking group bonded to R 1 via an ethereal oxygen, R 3 is a perfluoropolyether chain, and
R 4 is an end group represented by any one of Formulas (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).

4. 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 alkyl group that may have a substituent, R 2 is a divalent linking group bonded to R 1 via an ethereal oxygen, R 3 is represented by Formula (3), (4) or (5),

(in Formula (3), m and n represent average polymerization degrees, m represents 1 to 30, and n represents 0 to 30),

in Formula (4), u represents an average polymerization degree and represents 1 to 30),

in Formula (5), v represents an average polymerization degree and represents 1 to 30), and R 4 is an end group which is different from R 1 -R 2 and includes two or three polar groups, in which each of the polar groups is bonded to a different carbon atom, and the carbon atoms bonded to the polar groups are bonded to each other via a linking group containing a carbon atom not bonded to the polar groups).

5. 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 alkyl group in which a part or all of hydrogen atoms are substituted with halogen and an alkoxy group or with either halogen or an alkoxy group, R 2 is a divalent linking group bonded to R 1 via an ethereal oxygen, R 3 is a perfluoropolyether chain, and R 4 is an end group which is different from R 1 -R 2 and includes two or three polar groups, in which each of the polar groups is bonded to a different carbon atom, and the carbon atoms bonded to the polar groups are bonded to each other via a linking group containing a carbon atom not bonded to the polar groups).

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

7. The fluorine-containing ether compound according to claim 1 , wherein a number-average molecular weight thereof is in a range of 500 to 10000.

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

9. A magnetic recording medium, comprising:
a substrate; and
at least a magnetic layer, a protective layer, and a lubricating layer in this order on the substrate,
wherein the lubricating layer includes the fluorine-containing ether compound according to claim 1 .

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

11. A lubricant for a magnetic recording medium, comprising:
the fluorine-containing ether compound according to claim 3 .

12. A magnetic recording medium, comprising:
a substrate; and
at least a magnetic layer, a protective layer, and a lubricating layer in this order on the substrate,
wherein the lubricating layer includes the fluorine-containing ether compound according to claim 3 .

13. A lubricant for a magnetic recording medium, comprising:
the fluorine-containing ether compound according to claim 4 .

14. A magnetic recording medium, comprising:
a substrate; and
at least a magnetic layer, a protective layer, and a lubricating layer in this order on the substrate,
wherein the lubricating layer includes the fluorine-containing ether compound according to claim 4 .

15. A lubricant for a magnetic recording medium, comprising:
the fluorine-containing ether compound according to claim 5 .

16. A magnetic recording medium, comprising:
a substrate; and
at least a magnetic layer, a protective layer, and a lubricating layer in this order on the substrate,
wherein the lubricating layer includes the fluorine-containing ether compound according to claim 5 .

Assignees

• Showa Denko Kk

Inventors

• Kato Tsuyoshi
• Yagyu Daisuke
• Fukumoto Naoya
• Yamaguchi Yuta

Classifications

• G11B5/7257 Primary

  Perfluoropolyether lubricant · CPC title

• C07C43/315

  containing oxygen atoms singly bound to carbon atoms not being acetal carbon atoms · CPC title

• C10M2213/043

  used as base material · CPC title

• C10N2050/02

  dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating · CPC title

• G11B5/82

  Disk carriers · CPC title