Title:
LUBRICATING OIL COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2008/038701
Kind Code:
A1
Abstract:
A lubricating oil composition comprising: a base oil; (A) an acidic alkyl phosphate ester having a C6-C20 alkyl group; (B) a dialkylamine and/or a trialkylamine; and (C) (c-1) 0.2 to 0.6 mass% (in term of S) of a sulfur compound which does not contain a poly-sulfur bond equal to or higher than -S-S-S- in the molecule and has a S content of 15% by mass or more in the molecule and optionally (c-2) 0.1 to 1.0% by mass of a trihydrocarbyl thiophosphate ester represented by the general formula (I), wherein the composition has a P content of 150 to 500 ppm by mass: (R-O-)3P=S (I) wherein R represents a hydrocarbyl group having 6 to 20 carbon atoms. The lubricating oil composition is excellent in seizure resistance and fatigue resistance including FZG micropitting resistance, and can produce a reduced amount of sludge in an oxidation test.
Inventors:
OKADA TAHEI (JP)
Application Number:
PCT/JP2007/068779
Publication Date:
April 03, 2008
Filing Date:
September 27, 2007
Export Citation:
Assignee:
IDEMITSU KOSAN CO (JP)
OKADA TAHEI (JP)
OKADA TAHEI (JP)
International Classes:
C10M169/04; C10M129/76; C10M133/06; C10M133/10; C10M135/04; C10M135/06; C10M135/18; C10M135/22; C10M135/28; C10M135/36; C10M137/04; C10M137/10; C10N30/00; C10N30/06; C10N30/10; C10N40/04
Foreign References:
| JP2005126709A | 2005-05-19 | |||
| JP2002338983A | 2002-11-27 | |||
| JPH06100880A | 1994-04-12 | |||
| JP2005126709A | 2005-05-19 |
Other References:
See also references of EP 2067846A4
Attorney, Agent or Firm:
OHTANI, Tamotsu et al. (Bridgestone Toranomon Bldg.6F. 25-2, Toranomon 3-chome, Minato-k, Tokyo 01, JP)
Download PDF: