Ionic liquid, lubricant, and magnetic recording medium

Patent metadata

Field	Value
Publication number	US-9926508-B2
Application number	US-201515308481-A
Country	US
Kind code	B2
Filing date	Apr 28, 2015
Priority date	May 29, 2014
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A lubricant including an ionic liquid, which includes a conjugate acid (B + ) and a conjugate base (X − ), and is protic, wherein the conjugate acid includes a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein the conjugate base is represented by the following general formula (1):

where n is an integer of from 0 to 6 in the general formula (1).

First claim

The invention claimed is:

1. A lubricant comprising:
an ionic liquid, which includes a conjugate acid (B + ) and a conjugate base (X − ), and is protic,
wherein the ionic liquid is represented by any one of the following general formulae (2) to (4), and
wherein the conjugate base is represented by the following general formula (1):

where, in the general formulae (2) to (4), X − is the conjugate base represented by the general formula (1),
where three of R 1 , R 2 , R 3 , and R 4 is a hydrogen atom, and other one of R 1 , R 2 , R 3 , and R 4 is a group including a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (2),
where R 1 is a group including a straight-chain hydrocarbon group having 10 or more carbon atoms, and n is 0 or 1 in the general formula (3), and
where R 1 is a group including a straight-chain hydrocarbon group haying 10 or more carbon atoms in the general formula (4)

where n is an integer of from 0 to 6 in the general formula (1).

2. The lubricant according to claim 1 ,
wherein the conjugate base is represented by the following structural formula (1):

3. The lubricant according to claim 1 ,
wherein the hydrocarbon group is an alkyl group.

4. A magnetic recording medium comprising:
a non-magnetic support;
a magnetic layer on the non-magnetic support; and
the lubricant according to claim 1 on the magnetic layer.

5. An ionic liquid comprising:
a conjugate acid (B + ); and
a conjugate base (X − ),
wherein the ionic liquid is represented by any one of the following general formulae (2) to (4),
wherein the conjugate base is represented by the following general formula (1), and
wherein the ionic liquid is protic,

where, in the general formulae (2) to (4), X − is the conjugate base represented by the general formula (1),
where three of R 1 , R 2 , R 3 , and R 4 is a hydrogen atom, and other one of R 1 , R 2 , R 3 , and R 4 is a group including a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (2),
where R 1 is a group including a straight-chain hydrocarbon group haying 10 or more carbon atoms, and n is 0 or 1 in the general formula (3), and
where R 1 is a group including a straight-chain hydrocarbon croup haying 10 or more carbon atoms in the general formula (4)

where n is an integer of from 0 to 6 in the general formula (1).

6. The ionic liquid according to claim 5 ,
wherein the conjugate base is represented by the following structural formula (1):

7. The ionic liquid according to claim 5 , wherein the hydrocarbon group is an alkyl group.

8. The lubricant according to claim 1 ,
wherein the ionic liquid is represented by any one of the following general formulae (3) and (4):

where R1 is a group including a straight-chain hydrocarbon group having 10 or more carbon atoms, and n is 0 or 1 in the general formula (3), and
where R1 is a group including a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (4).

9. The ionic liquid according to claim 5 ,
wherein the ionic liquid is represented by any one of the following general formulae (3) and (4):

where R 1 is a group including a straight-chain hydrocarbon group having 10 or more carbon atoms, and n is 0 or 1 in the general formula (3), and
where R 1 is a group including a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (4).

Assignees

• Dexerials Corp

Inventors

• Kondo Hirofumi
• Hatsuda Kouki
• Ito Makiya
• Tano Nobuo
• Yun Kyungsung
• Watanabe Masayoshi

Classifications

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2020/077

  Ionic Liquids · CPC title

• C10N2040/18

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

• C10M2215/2203

  used as base material · CPC title

• C10M105/72 Primary

  containing sulfur, selenium or tellurium · CPC title