Title:
LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2008/072526
Kind Code:
A1
Abstract:
A lubricating oil composition for internal combustion engine that especially excels in high-temperature cleanness and ensures effective functioning of a metallic cleaning agent even under conditions such that moisture is mixed and accumulated therein; in particular, a lubricating oil composition for internal combustion engine that is suitable for use in an internal combustion engine of hybrid auto. The lubricating oil composition is one comprising, as a main component, lubricating base oil (A) of 1 to 8 mm2/s kinematic viscosity at 100°C, -15°C or below fluid point, 100°C or higher aniline point, 40 mass% or more paraffin content in saturated contents, 25 mass% or less monocyclic naphthene content, 35 mass% or less bi- to hexacyclic naphthene content, 2 or below iodine value and 6.3% or more tertiary carbon ratio to all constituent carbons, and further comprising, based on the whole mass of the composition, 0.005 to 0.5 mass%, in terms the mass of metal, of metallic cleaning agent (B), 0.005 to 0.2 mass%, in terms of the mass of boron, boronic succinimide ashless dispersant (C1) and 0.005 to 0.2 mass%, in terms of the mass of phosphorus, metal salt of phosphorus-containing acid (D).
Inventors:
YAGUCHI AKIRA (JP)
Application Number:
PCT/JP2007/073511
Publication Date:
June 19, 2008
Filing Date:
December 05, 2007
Export Citation:
Assignee:
NIPPON OIL CORP (JP)
YAGUCHI AKIRA (JP)
YAGUCHI AKIRA (JP)
International Classes:
C10M169/04; C10M129/10; C10M129/54; C10M135/10; C10M137/02; C10M137/06; C10M137/10; C10M139/00; C10M159/20; C10M159/22; C10M159/24; C10N10/04; C10N20/00; C10N20/02; C10N30/00; C10N30/04; C10N40/00; C10N40/04; C10N40/12; C10N40/25; C10N40/30
Domestic Patent References:
| WO2005090532A1 | 2005-09-29 | |||
| WO2006073198A1 | 2006-07-13 | |||
| WO2007114132A1 | 2007-10-11 |
Foreign References:
| JP2003528169A | 2003-09-24 | |||
| JP2003277782A | 2003-10-02 | |||
| JP2002294271A | 2002-10-09 | |||
| JP3662228B2 | 2005-06-22 |
Other References:
See also references of EP 2103673A4
Attorney, Agent or Firm:
HOSHINO, Tetsuro et al. (3rd FloorOak Building Kyobashi,16-10, Kyobashi 1-chome,Chuou-k, Tokyo 31, JP)
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