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Title:
LUBRICATING OIL COMPOSITION
Document Type and Number:
Japanese Patent JP2008266367
Kind Code:
A
Abstract:

To provide a lubricating oil composition that achieves both suppression of catalyst poisoning and enhancement of abrasion resistance in an internal combustion engine equipped with an oxidation catalyst or a three-way catalyst.

The lubricating oil composition comprises a lubricating base oil and at least one phosphorous compound selected from among metal salts of phosphorous compounds represented by formulae (1) and (2) with the content thereof of 0.005-0.5 mass% in terms of the phosphorus element based on the whole amount of the lubricating oil composition. In the formulae, R1 and R4 are each a 1-30C hydrocarbon group or a group containing at least one selected from among sulfur, oxygen and nitrogen; R2, R3, R5 and R6 are each a hydrogen atom, a 1-30C hydrocarbon group or a group containing at least one selected from among sulfur, oxygen and nitrogen; and m and n are each 0 or 1.


Inventors:
YAGISHITA KAZUHIRO
Application Number:
JP2007107374A
Publication Date:
November 06, 2008
Filing Date:
April 16, 2007
Export Citation:
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Assignee:
NIPPON OIL CORP
International Classes:
C10M169/04; C10M101/02; C10M105/04; C10M105/06; C10M105/36; C10M105/38; C10M107/02; C10M107/08; C10M107/10; C10M137/00; C10M137/02; C10M137/06; C10M137/12; C10N10/00; C10N20/00; C10N30/00; C10N30/06; C10N40/02; C10N40/04; C10N40/08; C10N40/12; C10N40/25; C10N40/30
Domestic Patent References:
JP2005002214A2005-01-06
JP2006117730A2006-05-11
JP2004083751A2004-03-18
JP2005120240A2005-05-12
JP2005220196A2005-08-18
JP2006117733A2006-05-11
Attorney, Agent or Firm:
Yoshiki Hasegawa
Shiro Terasaki