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

Patent metadata

Field	Value
Publication number	US-12338407-B2
Application number	US-202017772043-A
Country	US
Kind code	B2
Filing date	Nov 6, 2020
Priority date	Nov 7, 2019
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

This fluorine-containing ether compound is represented by formula (1) shown below.

R 1 —CH 2 —R 2 —CH 2 —R 3   (1)
In formula (1), R 2 is a perfluoropolyether chain represented by a formula (2) shown below. R 1 is a terminal group that is bonded to R 2 via a CH 2 group, and is represented by a formula (3) shown below. R 3 is bonded to R 2 via a CH 2 group, is a terminal group having at least one hydroxyl group, and may be the same as, or different from, R 1 .

—(CF 2 ) p-1 —O—((CF 2 ) p O) q —(CF 2 ) p-1 —  (2)
In formula (2), p represents an integer of 2 to 3, and q indicates the average polymerization degree and is a number within a range from 1 to 20.

—O(CH 2 —CH(OH)—CH 2 —O) 2 —CH 2 —(CH 2 ) n —OH  (3)
In formula (3), n represents an integer of 1 to 8.

First claim

The invention claimed is:

1. A fluorine-containing ether compound represented by formula (Q) shown below:

wherein in formula (Q), yq indicates an average polymerization degree, and represents a number from 1 to 20.

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

3. A magnetic recording medium comprising at least a magnetic layer, a protective layer and a lubricant layer provided sequentially on a substrate, wherein the lubricant layer contains the fluorine-containing ether compound according to claim 1 .

4. A fluorine-containing ether compound represented by formula (T) shown below:

wherein
in formula (T), yt indicates the average polymerization degree, and represents a number from 1 to 20.

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

6. A magnetic recording medium comprising at least a magnetic layer, a protective layer and a lubricant layer provided sequentially on a substrate, wherein the lubricant layer contains the fluorine-containing ether compound according to claim 4 .

7. A fluorine-containing ether compound represented by formula (A) shown below:

wherein
in formula (G), xg indicates the average polymerization degree, and represents a number from 1 to 14,

wherein
in formula (J), xj indicates the average polymerization degree, and represents a number from 1 to 14.

8. A lubricant for a magnetic recording medium, the lubricant containing the fluorine-containing ether compound according to claim 7 .

9. A lubricant for a magnetic recording medium according to claim 8 , wherein the amount of the fluorine-containing ether compound within the lubricant is 70% by mass or greater.

10. A magnetic recording medium comprising at least a magnetic layer, a protective layer and a lubricant layer provided sequentially on a substrate, wherein the lubricant layer contains the fluorine-containing ether compound according to claim 7 .

Assignees

• Showa Denko Kk
• Resonac Corp

Inventors

• Kato Tsuyoshi
• ASANO Ayano
• SHIBATA Natsumi
• Yagyu Daisuke

Classifications

• C10N2040/18

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

• C10M2211/0425

  used as base material · CPC title

• C07D309/12 Primary

  only hydrogen atoms and one oxygen atom directly attached to ring carbon atoms, e.g. tetrahydropyranyl ethers · CPC title

• C07C43/137

  containing halogen · CPC title

• G11B5/7257

  Perfluoropolyether lubricant · CPC title