Title:
LUBRICANT COMPOSITION
Document Type and Number:
Japanese Patent JP2020090558
Kind Code:
A
Abstract:
To provide a lubricant composition which contains a specific amount or more of boron, has excellent storge stability while being reduced in viscosity, has low friction and excellent wear resistance and antioxidant properties and to provide a lubricant composition improved in scoring resistance.SOLUTION: There is provided a lubricant composition which comprises (A) a lubricant base oil, (B) a phosphorus-based extreme-pressure agent, (C) a sulfur-based extreme-pressure agent, (D) an ashless dispersant and (E) a copolymer having a weight average molecular weight of 5000 to 100000 which has (E1) a unit derived from an alkyl (meth)acrylate component having an alkyl group having 1 to 30 carbon atoms and (E2) a unit derived from a hydroxyl group-containing (meth)acrylate component represented by a specific structural formula and has a repeating unit derived from the following (E1) component and a repeating unit derived from the following (E2) component in the mass ratio of (E1):(E2)=95 to 60:5 to 40, wherein the lubricant composition has a kinematic viscosity at 100°C of 2 to 10 mm/s and a boron content of 50 ppm or more and to 2000 ppm or less.SELECTED DRAWING: None
Inventors:
KONISHI TOMOYA
MIYATO NAOYOSHI
MIYATO NAOYOSHI
Application Number:
JP2018226396A
Publication Date:
June 11, 2020
Filing Date:
December 03, 2018
Export Citation:
Assignee:
EMG LUBRICANTS GK
International Classes:
C10M145/14; C10M135/04; C10M135/06; C10M135/20; C10M137/02; C10M137/04; C10M137/08; C10M137/10; C10M149/04; C10M151/04
Domestic Patent References:
| JP2018028069A | 2018-02-22 | |||
| JP2012041407A | 2012-03-01 | |||
| JP2001342484A | 2001-12-14 | |||
| JP2014070155A | 2014-04-21 | |||
| JP2018119059A | 2018-08-02 | |||
| JP2016190897A | 2016-11-10 | |||
| JP2017132875A | 2017-08-03 | |||
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Foreign References:
| WO2007123266A1 | 2007-11-01 | |||
| WO2016114401A1 | 2016-07-21 |
Attorney, Agent or Firm:
Mitsuo Matsui
Hiroshi Murakami
Yukari Kato
Hiroshi Murakami
Yukari Kato