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

Patent metadata

Field	Value
Publication number	US-11292979-B2
Application number	US-201715999837-A
Country	US
Kind code	B2
Filing date	Feb 20, 2017
Priority date	Feb 22, 2016
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A fluorine-containing ether compound represented by a formula (1) shown below.R4—CH2—R3—CH2—R2—CH2—R1—CH2—R2—CH2—R3—CH2—R5  (1)In formula (1), R1 and R3 represent the same or different perfluoropolyether chains, R2 represents a linking group containing at least one polar group, one or both of R4 and R5 represent a terminal group containing two or more polar groups, and R4 and R5 are different.

First claim

The invention claimed is:

1. A fluorine-containing ether compound represented by a formula (1) shown below:
R 4 —CH 2 —R 3 —CH 2 —R 2 —CH 2 —R 1 —CH 2 —R 2 —CH 2 —R 3 —CH 2 —R 5   (1)

wherein R 1 and R 3 represent identical or different perfluoropolyether chains, R 2 represents a linking group containing at least one polar group, one or both of R 4 and R 5 represent a terminal group containing two or more polar groups, R 4 and R 5 are different, and R 4 and R 5 are each a hydroxyl group or one terminal group selected from among formulas (2-1) to (2-5) shown below:

wherein r represents an integer of 0 to 4,

wherein p represents an integer of 1 to 5,

wherein s represents an integer of 2 to 5,

wherein t represents an integer of 1 to 5,

wherein q represents an integer of 2 to 5.

2. The fluorine-containing ether compound according to claim 1 , wherein one or both of R 1 and R 3 in the formula (1) are represented by a formula (3) shown below:

wherein m represents an integer of 1 to 20, and n represents an integer of 0 to 10.

3. The fluorine-containing ether compound according to claim 1 , wherein R 3 in the formula (1) is represented by a formula (4) shown below or a formula (5) shown below:

wherein u represents an integer of 1 to 30,

wherein v represents an integer of 1 to 30.

4. The fluorine-containing ether compound according to claim 1 , wherein a number of carbon atoms in R 2 in the formula (1) is from 1 to 20.

5. The fluorine-containing ether compound according to claim 1 , wherein R 2 in the formula (1) is represented by a formula (6) shown below:

wherein w represents an integer of 1 to 4.

6. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (D) shown below, and Rf 1 in the formula (D) is represented by a formula (RF-1) shown below:

wherein x represents an integer of 1 to 7, and y represents an integer of 1 to 7.

7. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (G) shown below, and Rf 1 in the formula (G) is represented by a formula (RF-1):

wherein x represents an integer of 1 to 7, and y represents an integer of 1 to 7.

8. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (H) shown below, and Rf 1 in the formula (H) is represented by a formula (RF-1):

wherein x represents an integer of 1 to 7, and y represents an integer of 1 to 7.

9. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (J) shown below, and Rf 1 in the formula (J) is represented by a formula (RF-1):

wherein x represents an integer of 1 to 7, and y represents an integer of 1 to 7.

10. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (K) shown below, and Rf 1 in the formula (K) is represented by a formula (RF-1):

wherein x represents an integer of 1 to 7, and y represents an integer of 1 to 7.

11. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (L) shown below, and Rf 1 in the formula (L) is represented by a formula (RF-1):

wherein x represents an integer of 1 to 7, and y represents an integer of 1 to 7.

12. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (O) shown below, and Rf 2 in the formula (O) is represented by a formula (RF-2) shown below:

wherein z represents an integer of 1 to 9.

13. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (Q) shown below, and Rf 2 in the formula (Q) is represented by a formula (RF-2):

wherein z represents an integer of 1 to 9.

14. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (R) shown below, and Rf 2 in the formula (R) is represented by a formula (RF-2):

wherein z represents an integer of 1 to 9.

15. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (U) shown below, and Rf 1 in the formula (U) is represented by a formula (RF-1):

wherein x represents an integer of 1 to 7, and y represents an integer of 1 to 7.

16. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (X) shown below, and Rf 1 in the formula (X) is represented by a formula (RF-1):

wherein x represents an integer of 1 to 7, and y represents an integer of 1 to 7.

17. The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represented by a formula (Z) shown below, and Rf 1 in the formula (Z) is represented by a formula (RF-1):

wherein x represents an integer of 1 to 7, and y represents an integer of 1 to 7.

Assignees

• Showa Denko Kk

Inventors

• Yamaguchi Yuta
• Fukumoto Naoya
• Ito Naoko
• Tomita Hiroyuki
• Ota Ichiro
• Murofushi Katsumi

Classifications

• G11B5/7257 Primary

  Perfluoropolyether lubricant · CPC title

• C10M105/54 Primary

  containing carbon, hydrogen, halogen and oxygen · CPC title

• C10N2040/18

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

• C10M2211/0425

  used as base material · CPC title

• C07C43/137

  containing halogen · CPC title