Electrically-conductive lubricant

Patent metadata

Field	Value
Publication number	US-11674102-B2
Application number	US-202217752552-A
Country	US
Kind code	B2
Filing date	May 24, 2022
Priority date	Jul 17, 2018
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

Provided is a lubricant composition including a bicyclic liquid crystal of formula (1), and a tricyclic liquid crystal compound of formula (2), and having a mixing mass ratio of the bicyclic liquid crystal compound and tricyclic liquid crystal compound of 95:5 to 15:85. The composition is suitable for use in a clean environment, under a high vacuum, under high temperature and a bearing.R1 and R2 are the same or different from each other, and each is —OCH2CH2CH(R′)CH2CH2ORR11 and R21 are the same or different from each other, and each is —OR. R12, R13, R22 and R23 are the same or different from each other, and each is hydrogen or —OR. R is a linear or branched CnH2n+1, 1≤n≤20 and R′ is methyl or ethyl.

First claim

The invention claimed is:

1. A lubricant composition which comprises a bicyclic liquid crystal component and a tricyclic liquid crystal component, wherein the bicyclic liquid crystal component consists essentially of at least one kind of a bicyclic liquid crystal compound represented by the following formula (1) and the tricyclic liquid crystal component consists essentially of at least one kind of a tricyclic liquid crystal compound represented by the following formula (2), and a mixing ratio of the above-mentioned bicyclic liquid crystal compound and the above-mentioned tricyclic liquid crystal compound is 95:5 to 15:85 in a mass ratio,
wherein the above-mentioned bicyclic liquid crystal compound is present in a higher concentration than the above-mentioned tricyclic liquid crystal compound,

wherein,
R 1 and R 2 are the same or different from each other, and each is a group —OCH 2 CH 2 CH(R′)CH 2 CH 2 OR, wherein R is a linear or branched C n H 2n+1 , 1≤n≤20, and R′ is methyl or ethyl,

wherein,
R 11 and R 21 are the same or different from each other, and each is a group —OR, wherein R is a linear or branched C n H 2n+1 , and 1≤n≤20, and
R 12 , R 13 , R 22 and R 23 are the same or different from each other, and each is hydrogen or a group —OR, wherein R is a linear or branched C n H 2n+1 , and 1≤n≤20.

2. The lubricant composition according to claim 1 , wherein, in the above formula (1), 1≤n≤15, and R′ is methyl.

3. The lubricant composition according to claim 1 , wherein the tricyclic liquid crystal component consists essentially of at least one kind among the compounds represented by the following formulae (3) to (5).

4. The lubricant composition according to claim 1 , wherein a percent remaining of the lubricant composition, after holding in an atmosphere at a temperature of 100° C. and an atmospheric pressure for 600 hours, relative to an initial amount of the lubricant composition, is 95% or more.

5. The lubricant composition according to claim 1 , wherein a percent remaining of the lubricant composition, after holding in an atmosphere at a temperature of 25° C. and a pressure of 10 −5 Pa for 1,000 hours, relative to an initial amount of the lubricant composition, is 95% or more.

6. A bearing in which the lubricant composition according to claim 1 is sealed.

Assignees

• Univ Yamanashi
• Nippon Thompson Co Ltd
• Ushio Chemix Corp

Inventors

• Haramoto Yuichiro
• Itabashi Shigemasa
• TAKEMURA Ayana
• Okamoto Kazuo
• Otsuki Hiroyuki

Classifications

• C10M115/04 Primary

  containing oxygen · CPC title

• C10N2050/10

  semi-solid; greasy · CPC title

• C10N2030/30

  Anti-misting · CPC title

• C10N2040/02

  Bearings · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title