Ionic liquid, lubricant, and magnetic recording medium

Patent metadata

Field	Value
Publication number	US-9920272-B2
Application number	US-201515319697-A
Country	US
Kind code	B2
Filing date	May 19, 2015
Priority date	Jun 19, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A lubricant including an ionic liquid, which includes a conjugate acid (B + ) and a conjugate base (X − ), and is protic, wherein the ionic liquid is represented by the following general formula (1):

where R 1 and R 2 each represent a hydrogen atom or R 1 and R 2 form a benzene ring together with carbon atoms to which R 1 and R 2 are bonded, and R 3 represents a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (1).

First claim

The invention claimed is:

1. A lubricant comprising:
an extreme pressure agent, and
an ionic liquid, which includes a conjugate acid (B + ) and a conjugate base (X − ), and is protic,
wherein the ionic liquid is represented by the following general formula (1):

where R 1 and R 2 each represent a hydrogen atom or R 1 and R 2 form a benzene ring together with carbon atoms to which R 1 and R 2 are bonded, and R 3 represents a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (1).

2. The lubricant according to claim 1 ,
wherein the conjugate base is represented by any one of the following general formulae (2) to (4):

where n is an integer of 0 to 20 in the general formula (2), m is an integer of 0 to 2 in the general formula (3), and n is an integer of 0 to 10 in the general formula (4).

3. A magnetic recording medium comprising:
a non-magnetic support;
a magnetic layer on the non-magnetic support; and
a lubricant on the magnetic layer,
wherein the lubricant comprises an ionic liquid, which includes a conjugate acid (B + ) and a conjugate base (X − ), and is protic,
wherein the ionic liquid is represented by the following general formula (1):

where R 1 and R 2 each represent a hydrogen atom or R 1 and R 2 form a benzene ring together with carbon atoms to which R 1 and R 2 are bonded, and R 3 represents a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (1).

4. An ionic liquid comprising:
a conjugate acid (B + ); and
a conjugate base (X − ),
wherein the ionic liquid is represented by the following general formula (1) and is protic:

where R 1 and R 2 form a benzene ring together with carbon atoms to which R 1 and R 2 are bonded, and R 3 represents a straight-chain hydrocarbon group having 10 or more carbon atoms in the general formula (1).

5. The ionic liquid according to claim 4 ,
wherein the conjugate base is represented by any one of the following general formulae (2) to (4):

where n is an integer of 0 to 20 in the general formula (2), m is an integer of 0 to 2 in the general formula (3), and n is an integer of 0 to 10 in the general formula (4).

Assignees

• Dexerials Corp

Inventors

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

Classifications

• C10N2030/08

  Resistance to extreme temperature · CPC title

• C10N2020/077

  Ionic Liquids · CPC title

• C10N2050/02

  dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating · CPC title

• C10M2215/2265

  used as base material · CPC title

• C10N2040/18

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