Ionic liquid, lubricating agent, and magnetic recording medium

Patent metadata

Field	Value
Publication number	US-10906908-B2
Application number	US-201815974804-A
Country	US
Kind code	B2
Filing date	May 9, 2018
Priority date	Dec 28, 2012
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A lubricating agent including an ionic liquid formed from a Bronsted acid (HX) and a Bronsted base (B), wherein the Bronsted base has a linear hydrocarbon group having 10 or more carbon atoms and the difference between the pKa value of the Bronsted acid in water and the pKa value of the Bronsted base in water is 12 or more.

First claim

The invention claimed is:

1. An ionic liquid,
wherein the ionic liquid is formed from a Bronsted acid (HX) and a Bronsted base (B),
wherein the Bronsted base has a linear hydrocarbon group having 10 or more carbon atoms,
wherein the ionic liquid is represented by the following General Formula (2) or (3),
wherein the Bronsted acid is trifluoromethane sulfonic acid, a compound represented by the following Structural Formula (A), a compound represented by the following Structural Formula (B), a compound represented by the following Structural Formula (C), or a compound represented by the following Structural Formula (D), and
wherein a difference between a pKa value of the Bronsted acid in water and a pKa value of the Bronsted base in water is 12 or more:

wherein R 11 denotes the linear hydrocarbon group having 10 or more carbon atoms and being attached to a carbon atom in a bicyclo ring,

wherein R21 denotes the linear hydrocarbon group having 10 or more carbon atoms and being attached to a carbon atom or a nitrogen atom in a bicycle ring

2. The ionic liquid according to claim 1 , wherein the ionic liquid has an exothermic peak temperature determined by a differential thermal analysis (DTA) measurement of 370° C. or higher.

3. The ionic liquid according to claim 1 , wherein the linear hydrocarbon group is an alkyl group.

4. The ionic liquid according to claim 1 , wherein the Bronsted base is a compound represented by the following Structural Formula (1):

5. The ionic liquid according to claim 1 , wherein the General Formula (2) is the following General Formula (2-1), and the General Formula (3) is the following General Formula (3-1):

wherein R 11 denotes a linear hydrocarbon group having 10 or more carbon atoms,

wherein R 21 denotes a linear hydrocarbon group having 10 or more carbon atoms.

6. The ionic liquid according to claim 1 , wherein the number of carbon atoms in the linear hydrocarbon group is 10 or more and 25 or less.

7. An ionic liquid,
wherein the ionic liquid is formed from a Bronsted acid (HX) and a Bronsted base (B),
wherein the ionic liquid is represented by the following General Formula (2) or (3),
wherein the Bronsted acid is trifluoromethane sulfonic acid, a compound represented by the following Structural Formula (A), a compound represented by the following Structural Formula (B), a compound represented by the following Structural Formula (C), or a compound represented by the following Structural Formula (D), and
wherein a difference between a pKa value of the Bronsted acid in acetonitrile and a pKa value of the Bronsted base in acetonitrile is 6 or more:

wherein R 11 denotes a linear hydrocarbon group having 10 or more carbon atoms and being attached to a carbon atom in a bicyclo ring,

wherein R 21 denotes a linear hydrocarbon group having 10 or more carbon atoms and being attached to a carbon atom or a nitrogen atom in a bicyclo ring

8. The ionic liquid according to claim 7 , wherein the ionic liquid has an exothermic peak temperature determined by a differential thermal analysis (DTA) measurement of 370° C. or higher.

9. The ionic liquid according to claim 7 , wherein the Bronsted base is a compound represented by the following Structural Formula (2), or a compound represented by the following Structural Formula (3):

10. The ionic liquid according to claim 7 , wherein the General Formula (2) is the following General Formula (2-1), and the General Formula (3) is the following General Formula (3-1):

wherein R 11 denotes a linear hydrocarbon group having 10 or more carbon atoms,

wherein R 21 denotes a linear hydrocarbon group having 10 or more carbon atoms.

11. The ionic liquid according to claim 7 , wherein the number of carbon atoms in the linear hydrocarbon group is 10 or more and 25 or less.

12. A lubricating agent, comprising;
the ionic liquid according to claim 1 .

13. A lubricating agent, comprising;
the ionic liquid according to claim 7 .

14. A lubricating agent, comprising:
an extreme pressure agent and,
an ionic liquid formed from a Bronsted acid (HX) and a Bronsted base (B),
wherein the Bronsted base has a linear hydrocarbon group having 10 or more carbon atoms,
wherein the ionic liquid is represented by the following General Formula (2) or (3),
wherein the Bronsted acid is trifluoromethane sulfonic acid, a compound represented by the following Structural Formula (A), a compound represented by the following Structural Formula (B), a compound represented by the following Structural Formula (C), or a compound represented by the following Structural Formula (D), and
wherein a difference between a pKa value of the Bronsted acid in water and a pKa value of the Bronsted base in water is 12 or more:

wherein R 11 denotes the linear hydrocarbon group having 10 or more carbon atoms and being attached to a carbon atom in a bicyclo ring,

wherein R 21 denotes the linear hydrocarbon group having 10 or more carbon atoms and being attached to a carbon atom or a nitrogen atom in a bicyclo ring

15. The lubricating agent according to claim 14 , wherein the ionic liquid has an exothermic peak temperature determined by a differential thermal analysis (DTA) measurement of 370° C. or higher.

16. The lubricating agent according to claim 14 , wherein the linear hydrocarbon group is an alkyl group.

17. The lubricating agent according to claim 14 , wherein the General Formula (2) is the following General Formula (2-1), and the General Formula (3) is the following General Formula (3-1):

wherein R 11 denotes a linear hydrocarbon group having 10 or more carbon atoms,

wherein R 21 denotes a linear hydrocarbon group having 10 or more carbon atoms.

18. A lubricating agent, comprising:
an extr

Assignees

• Dexerials Corp

Inventors

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

Classifications

• G11B5/7253

  Fluorocarbon lubricant · CPC title

• C10N2020/069

  Linear chain compounds · CPC title

• C10M2215/003

  used as base material · CPC title

• C10M2215/2203

  used as base material · CPC title

• C10M2215/041

  used as base material · CPC title