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

Patent metadata

Field	Value
Publication number	US-2020263104-A1
Application number	US-201715999837-A
Country	US
Kind code	A1
Filing date	Feb 20, 2017
Priority date	Feb 22, 2016
Publication date	Aug 20, 2020
Grant date	—

Abstract

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

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, and R 4 and R 5 are different.

2 . The fluorine-containing ether compound according to claim 1 , wherein R 4 and R 5 in the formula (1) 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.

3 . 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 in represents an integer of 1 to 20, and n represents an integer of 0 to 10.

4 . 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.

5 . 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.

6 . 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.

7 . The fluorine-containing ether compound according to claim 1 , wherein one of R 4 and R 5 in the formula (1) is a hydroxyl group.

8 . 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.

9 . 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.

10 . 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.

11 . 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.

12 . The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (I) 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.

13 . 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.

14 . 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.

15 . 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.

16 . 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.

17 . 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.

18 . 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.

19 . The fluorine-containing ether compound according to claim 1 , wherein the compound represented by the formula (1) is represent

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

• G11B5/725

  containing a lubricant {, e.g. organic compounds (inorganic carbon protective coating G11B5/727)} · CPC title

• C10N2050/023

  Multi-layer lubricant coatings · CPC title

• C10N2040/18

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

• C10M2213/06

  Perfluoro polymers · CPC title