Ionic liquid, lubricating agent, and magnetic recording medium

Patent metadata

Field	Value
Publication number	US-10047091-B2
Application number	US-201314655457-A
Country	US
Kind code	B2
Filing date	Dec 27, 2013
Priority date	Dec 28, 2012
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

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

What is claimed is:

1. A magnetic recording medium, comprising:
a non-magnetic support; and
at least a magnetic layer on or above the non-magnetic support,
wherein the magnetic layer contains a lubricating agent comprising:
an ionic liquid formed from a Bronsted acid (HX) and a Bronsted base (B),
wherein the ionic liquid is represented by the following General Formula (1), (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 at least one of R 1 , R 2 , R 3 , and R 4 is a hydrogen atom, and at least one of R 1 , R 2 , R 3 , and R 4 is a group which contains the linear hydrocarbon group having 10 or more carbon atoms,

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,

2. The magnetic recording medium 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 magnetic recording medium according to claim 1 , wherein the hydrocarbon group is an alkyl group.

4. A magnetic recording medium, comprising:
a non-magnetic support; and
at least a magnetic layer on or above the non-magnetic support,
wherein the magnetic layer contains a lubricating agent comprising:
an ionic liquid formed from a Bronsted acid (HX) and a Bronsted base (B),
wherein the ionic liquid is represented by the following General Formula (1), (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 at least one of R 1 , R 2 , R 3 , and R 4 is a hydrogen atom, and at least one of R 1 , R 2 , R 3 , and R 4 is a group which contains the linear hydrocarbon group having 10 or more carbon atoms,

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,

5. The magnetic recording medium according to claim 4 , wherein the ionic liquid has an exothermic peak temperature determined by a differential thermal analysis (DTA) measurement of 370° C. or higher.

6. The magnetic recording medium 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.

7. The magnetic recording medium according to claim 1 , wherein the number of carbon atoms in the linear hydrocarbon group is 10 or more and 25 or less.

8. The magnetic recording medium according to claim 6 , wherein the number of carbon atoms in the linear hydrocarbon group is 10 or more and 25 or less.

9. The magnetic recording medium according to claim 4 , 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.

10. The magnetic recording medium according to claim 4 , wherein the number of carbon atoms in the linear hydrocarbon group is 10 or more and 25 or less.

11. The magnetic recording medium according to claim 9 , where the number of carbon atoms in the linear hydrocarbon group is 10 or more and 25 or less.

Assignees

• Dexerials Corp

Inventors

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

Classifications

• C10N2020/069

  Linear chain compounds · CPC title

• C10M105/70

  as ring hetero atom · CPC title

• C10M2215/2203

  used as base material · CPC title

• C10M2219/0406

  used as base material · CPC title

• C07D285/15

  Six-membered rings · CPC title