Ionic liquid, lubricant, and magnetic recording medium

• US 9,926,508 B2
• Filed: 04/28/2015
• Issued: 03/27/2018
• Est. Priority Date: 05/29/2014
• Status: Active Grant

• Current Assignee: Dexerials Corporation
• Original Assignee: Dexerials Corporation
• Inventors: Kondo, Hirofumi, Hatsuda, Kouki, Ito, Makiya, Tano, Nobuo, Yun, Kyungsung, Watanabe, Masayoshi
• Primary Examiner(s): GOLOBOY, JAMES C
• Application Number:
  US15/308,481
• Publication Number:
  US 20170058227A1
• Time in Patent Office: 1,064 Days
• CPC Class Codes: C10M 105/50 containing halogen
• CPC Class Codes: C10M 105/60 having amino groups bound to an acyclic or cycloaliphatic carbon atom
• CPC Class Codes: C10M 105/70 as ring hetero atom
• CPC Class Codes: C10M 105/72 containing sulfur, selenium or tellurium
• CPC Class Codes: C10M 135/10 Sulfonic acids or derivatives thereof
• CPC Class Codes: C10M 2215/04 having amino groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2215/2203 used as base material
• CPC Class Codes: C10M 2215/221 Six-membered rings containing nitrogen and carbon only
• CPC Class Codes: C10M 2219/04 containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
• CPC Class Codes: C10M 2219/0406 used as base material
• CPC Class Codes: C10M 2219/044 Sulfonic acids, Derivatives thereof, e.g. neutral salts
• CPC Class Codes: C10N 2020/077 Ionic Liquids
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2040/18 in connection with recordings on magnetic tape or disc
• CPC Class Codes: G11B 5/7253 Fluorocarbon lubricant

Abstract

A lubricant including an ionic liquid, which includes a conjugate acid (B⁺) and a conjugate base (X⁻), and is protic, wherein the conjugate acid includes a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein the conjugate base is represented by the following general formula (1):

where n is an integer of from 0 to 6 in the general formula (1).

Claims

1. A lubricant comprising:

an ionic liquid, which includes a conjugate acid (B⁺) and a conjugate base (X⁻

), and is protic,

wherein the ionic liquid is represented by any one of the following general formulae (2) to (4), and

wherein the conjugate base is represented by the following general formula (1);

2. The lubricant according to claim 1,

wherein the conjugate base is represented by the following structural formula (1):

3. The lubricant according to claim 1,

wherein the hydrocarbon group is an alkyl group.

4. A magnetic recording medium comprising:

a non-magnetic support;

a magnetic layer on the non-magnetic support; and

the lubricant according to claim 1 on the magnetic layer.

8. The lubricant according to claim 1,

wherein the ionic liquid is represented by any one of the following general formulae (3) and (4):

5. An ionic liquid comprising:

a conjugate acid (B⁺); and

a conjugate base (X⁻

),

wherein the ionic liquid is represented by any one of the following general formulae (2) to (4),

wherein the conjugate base is represented by the following general formula (1), and

wherein the ionic liquid is protic,

6. The ionic liquid according to claim 5,

wherein the conjugate base is represented by the following structural formula (1):

7. The ionic liquid according to claim 5, wherein the hydrocarbon group is an alkyl group.

9. The ionic liquid according to claim 5,

wherein the ionic liquid is represented by any one of the following general formulae (3) and (4):