Ionic liquid, lubricant, and magnetic recording medium

Patent metadata

Field	Value
Publication number	US-2017066989-A1
Application number	US-201515308450-A
Country	US
Kind code	A1
Filing date	Apr 28, 2015
Priority date	May 29, 2014
Publication date	Mar 9, 2017
Grant date	—

Abstract

A lubricant including an ionic liquid, which contains a conjugate acid (B + ) and a conjugate base (X − ) and is aprotic, wherein the conjugate acid contains a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein an acid that is a source of the conjugate base has a pKa in water of 0 or less.

First claim

1 . A lubricant comprising:
an ionic liquid, which contains a conjugate acid (B + ) and a conjugate base (X − ), and is aprotic, wherein the conjugate acid contains a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein an acid that is a source of the conjugate base has a pKa in water of 0 or less.

2 . The lubricant according to claim 1 ,
wherein the conjugate acid is generated from a base containing a straight-chain hydrocarbon group having 10 or more carbon atoms, and the base is amine, amidine, guanidine, or imidazole.

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

where R 1 , R 2 , R 3 , and R 4 are groups other than hydrogen atoms, and at least one of R 1 , R 2 , R 3 , and R 4 is a group containing a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (1),
where R 1 is a group containing a straight-chain hydrocarbon group having 10 or more carbon atoms, R 2 is a group other than a hydrogen atom, and n is 0 or 1 in the general formula (2), and
where R 1 is a group containing a straight-chain hydrocarbon group having 10 or more carbon atoms, and R 2 is a group other than a hydrogen atom in the general formula (3).

4 . The lubricant according to claim 1 ,
wherein the conjugate base is represented by the following general formula (4):

where n is an integer of 0 or greater in the general formula (4).

5 . The lubricant according to claim 1 ,
wherein the conjugate base is represented by one of the following structural formulae (1) to (4):

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

where n is an integer of 1 or greater in the general formula (5).

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

8 . 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.

9 . An ionic liquid comprising:
a conjugate acid (B + ); and a conjugate base (X − ), wherein the conjugate acid contains a straight-chain hydrocarbon group having 10 or more carbon atoms, wherein an acid that is a source of the conjugate base has a pKa in water of 0 or less, and wherein the ionic liquid is aprotic.

10 . The ionic liquid according to claim 9 ,
wherein the conjugate acid is generated from a base containing a straight-chain hydrocarbon group having 10 or more carbon atoms, and the base is amine, amidine, guanidine, or imidazole.

11 . The ionic liquid according to claim 9 ,
wherein the ionic liquid is represented by one of the following general formulae (1) to (3):

where R 1 , R 2 , R 3 , and R 4 are groups other than hydrogen atoms, and at least one of R 1 , R 2 , R 3 , and R 4 is a group containing a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (1),
where R 1 is a group containing a straight-chain hydrocarbon group having 10 or more carbon atoms, R 2 is a group other than a hydrogen atom, and n is 0 or 1 in the general formula (2), and
where R 1 is a group containing a straight-chain hydrocarbon group having 10 or more carbon atoms, and R 2 is a group other than a hydrogen atom in the general formula (3).

12 . The ionic liquid according to claim 9 ,
wherein the conjugate base is represented by the following general formula (4):

where n is an integer of 0 or greater in the general formula (4).

13 . The ionic liquid according to claim 9 ,
wherein the conjugate base is represented by one of the following structural formulae (1) to (4):

14 . The ionic liquid according to claim 9 ,
wherein the conjugate base is represented by the following general formula (5):

where n is an integer of 1 or greater in the general formula (5).

15 . The ionic liquid according to claim 9 ,
wherein the hydrocarbon group is an alkyl group.

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

• C10M2215/2203

  used as base material · CPC title

• C10M159/12

  Reaction products · CPC title

• C10N2020/077

  Ionic Liquids · CPC title

• C10N2040/18

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