Ionic Liquid, Lubricant, and Magnetic Recording Medium

Patent metadata

Field	Value
Publication number	US-2018016510-A1
Application number	US-201615546584-A
Country	US
Kind code	A1
Filing date	Jan 7, 2016
Priority date	Jan 28, 2015
Publication date	Jan 18, 2018
Grant date	—

Abstract

A lubricant, which includes an ionic liquid including a conjugate base and a conjugate acid including 2 or more cations in a molecule of the conjugate acid, wherein the conjugate acid includes a monovalent group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and an acid that is a source of the conjugate base has a pKa in acetonitrile of 10 or less.

First claim

1 . A lubricant comprising:
an ionic liquid including a conjugate base and a conjugate acid including 2 or more cations in a molecule of the conjugate acid, wherein the conjugate acid includes a monovalent group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and an acid that is a source of the conjugate base has a pKa in acetonitrile of 10 or less.

2 . The lubricant according to claim 1 ,
wherein the ionic liquid is represented by General Formula (1) below:

where, in General Formula (1), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, A − is the conjugate base, and n is 1 or greater but 20 or less.

3 . The lubricant according to claim 1 ,
wherein the ionic liquid is represented by General Formula (1-1) below, General Formula (1-2) below, General Formula (1-3) below, or General Formula (1-4) below:

where, in General Formula (1-1), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, n is 1 or greater but 20 or less, and 1 is 1 or greater but 12 or less,
in General Formula (1-2), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and n is 1 or greater but 20 or less,
in General Formula (1-3), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, n is 1 or greater but 20 or less, and m is 0 or greater but 12 or less, and
in General Formula (1-4), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and n is 1 or greater but 20 or less.

4 . The lubricant according to claim 1 ,
wherein the ionic liquid is represented by General Formula (2) below:

where, in General Formula (2), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, A − is the conjugate base, and n is 1 or greater but 20 or less.

5 . The lubricant according to claim 1 ,
wherein the ionic liquid is represented by General Formula (2-1) below, General Formula (2-2) below, General Formula (2-3) below, or General Formula (2-4) below:

where, in General Formula (2-1), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, n is 1 or greater but 20 or less, and l is 1 or greater but 12 or less,
in General Formula (2-2), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and n is 1 or greater but 20 or less,
in General Formula (2-3), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, n is 1 or greater but 20 or less, and m is 0 or greater but 12 or less, and
in General Formula (2-4), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and n is 1 or greater but 20 or less.

6 . The lubricant according to claim 1 ,
wherein the ionic liquid is represented by General Formula (3) below:

where, in General Formula (3), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, A − is the conjugate base, and n is 1 or greater but 20 or less.

7 . The lubricant according to claim 1 ,
wherein the ionic liquid is represented by General Formula (3-1) below, General Formula (3-2) below, General Formula (3-3) below, or General Formula (3-4) below:

where, in General Formula (3-1), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, n is 1 or greater but 20 or less, and 1 is 1 or greater but 12 or less,
in General Formula (3-2), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and n is 1 or greater but 20 or less,
in General Formula (3-3), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, n is 1 or greater but 20 or less, and m is 0 or greater but 12 or less, and
in General Formula (3-4), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and n is 1 or greater but 20 or less.

8 . The lubricant according to claim 1 ,
wherein the ionic liquid is represented by General Formula (4) below:

where, in General Formula (4), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, A − is the conjugate base, and n is 1 or greater but 20 or less.

9 . The lubricant according to claim 1 ,
wherein the ionic liquid is represented by General Formula (4-1) below, General Formula (4-2) below, General Formula (4-3) below, or General Formula (4-4) below:

where, in General Formula (4-1), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, n is 1 or greater but 20 or less, and 1 is 1 or greater but 12 or less,
in General Formula (4-2), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and n is 1 or greater but 20 or less,
in General Formula (4-3), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, n is 1 or greater but 20 or less, and m is 0 or greater but 12 or less, and
in General Formula (4-4), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and n is 1 or greater but 20 or less.

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

11 . An ionic liquid comprising:
a conjugate base; and a conjugate acid including 2 or more cations in a molecule of the conjugate acid, wherein the conjugate acid includes a monovalent group including a straight-chain hydrocarbon group having 6 or more carbon atoms, and an acid that is a source of the conjugate base has a pKa in acetonitrile of 10 or less.

12 . The ionic liquid according to claim 11 ,
wherein the ionic liquid is represented by General Formula (1) below:

where, in General Formula (1), each R is independently a group including a straight-chain hydrocarbon group having 6 or more carbon atoms, A − is the conjugate base, and n is 1 or greater but 20 or less.

13 . The ionic liquid according to claim 11 ,
wherein the ionic liquid is represented by General Formula (1-1

Assignees

• Dexerials Corp

Inventors

• Kondo Hirofumi
• Hatsuda Kouki
• Tano Nobuo
• Yun Kyungsung

Classifications

• C07D285/15

  Six-membered rings · CPC title

• C07C311/48

  having nitrogen atoms of sulfonamide groups further bound to another hetero atom · CPC title

• C10M105/70

  as ring hetero atom · CPC title

• C10N2020/077

  Ionic Liquids · CPC title

• C10N2030/08

  Resistance to extreme temperature · CPC title