Ionic Liquid, Lubricant, and Magnetic Recording Medium

Patent metadata

Field	Value
Publication number	US-2020216773-A1
Application number	US-201916677992-A
Country	US
Kind code	A1
Filing date	Nov 8, 2019
Priority date	Jan 28, 2015
Publication date	Jul 9, 2020
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 . (canceled)

2 . (canceled)

3 . (canceled)

4 . (canceled)

5 . (canceled)

6 . (canceled)

7 . (canceled)

8 . A lubricant comprising:
an ionic liquid including a conjugate base and conjugate acid, wherein an acid that is the source of the conjugate base has a pKa in acetonitrile of 10 or less, and 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 8 ,
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 l 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 8 disposed on or above the magnetic layer.

11 . (canceled)

12 . (canceled)

13 . (canceled)

14 . (canceled)

15 . (canceled)

16 . (canceled)

17 . (canceled)

18 . An ionic liquid comprising:
a conjugate base; and a conjugate acid, wherein an acid that is a source of the conjugate base has a pKa in acetonitrile of 10 or less, and 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.

19 . The ionic liquid according to claim 18 ,
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 l 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.

Assignees

• Dexerials Corp

Inventors

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

Classifications

• G11B5/725

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

• C10M171/00 Primary

  Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated (chemically defined ingredients C10M101/00 - C10M169/00; petroleum fractions C10M101/02, C10M121/02, C10M159/04) · CPC title

• C10M105/72 Primary

  containing sulfur, selenium or tellurium · CPC title

• C07C211/63

  having quaternised nitrogen atoms bound to acyclic carbon atoms · CPC title

• C10M2215/041

  used as base material · CPC title