Title:
LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2006/068203
Kind Code:
A1
Abstract:
A lubricating oil composition which comprises a lube base oil comprising a mineral oil and/or synthetic oil and contains, as (A) an ash-free dispersant, an alkenyl- or alkylsuccinimide and/or a boron compound derivative thereof incorporated in the base oil in an amount of 0.01-0.14 mass% in terms of nitrogen amount based on the composition, the content of the alkenyl- or alkylsuccinic acid monoimide and/or boron compound derivative thereof in the ash-free dispersant being 0.05 mass% or lower in terms of nitrogen amount based on the composition. The composition further contains, as (B) an antioxidant, a dialkyldiphenylamine compound and a hindered phenol compound in amounts of 0.3-5.0 mass% and 0-2.5 mass%, respectively, based on the composition. The composition has (C) a sulfated ash content of 1.2 mass% or lower. The lubricating oil composition has excellent oxidative stability despite the low ash content and increases little in viscosity and acid value. It is suitable for use as a lubricating oil composition for internal combustion engines which is capable of prolonging the lubricating oil changing distance (time).
Inventors:
KAMANO HIDEKI (JP)
ISHIKAWA MOTOHARU (JP)
TESHIMA KAZUHIRO (JP)
ISHIKAWA MOTOHARU (JP)
TESHIMA KAZUHIRO (JP)
Application Number:
PCT/JP2005/023540
Publication Date:
June 29, 2006
Filing Date:
December 21, 2005
Export Citation:
Assignee:
IDEMITSU KOSAN CO (JP)
KAMANO HIDEKI (JP)
ISHIKAWA MOTOHARU (JP)
TESHIMA KAZUHIRO (JP)
KAMANO HIDEKI (JP)
ISHIKAWA MOTOHARU (JP)
TESHIMA KAZUHIRO (JP)
International Classes:
C10M133/02; C10M141/06; C10M141/12; C10M163/00; C10M129/10; C10M133/12; C10M133/16; C10M139/00; C10M159/22; C10N10/04; C10N20/04; C10N30/00; C10N30/10; C10N40/25; C10N60/14
Domestic Patent References:
| WO2003033629A1 | 2003-04-24 |
Foreign References:
| JP2002294271A | 2002-10-09 | |||
| JP2004083746A | 2004-03-18 | |||
| JP2001158896A | 2001-06-12 | |||
| JP2003096483A | 2003-04-03 | |||
| JPH10219266A | 1998-08-18 | |||
| JP2003165991A | 2003-06-10 | |||
| JP2003327987A | 2003-11-19 | |||
| JP2003336089A | 2003-11-28 | |||
| JP2002309273A | 2002-10-23 | |||
| JPH07126671A | 1995-05-16 | |||
| EP1439217A1 | 2004-07-21 | |||
| EP1227145A1 | 2002-07-31 | |||
| EP1535985A1 | 2005-06-01 | |||
| EP0860495A2 | 1998-08-26 |
Other References:
See also references of EP 1829952A4
Attorney, Agent or Firm:
Ohtani, Tamotsu (25-2, Toranomon 3-chom, Minato-ku Tokyo01, JP)
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