| (19) |
 |
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(11) |
EP 1 985 690 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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28.12.2011 Bulletin 2011/52 |
| (43) |
Date of publication A2: |
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29.10.2008 Bulletin 2008/44 |
| (22) |
Date of filing: 25.04.2008 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL
PT RO SE SI SK TR |
|
Designated Extension States: |
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AL BA MK RS |
| (30) |
Priority: |
27.04.2007 JP 2007119824
|
| (71) |
Applicant: TonenGeneral Sekiyu Kabushiki Kaisha |
|
Minato-ku,
Tokyo 108-8005 (JP) |
|
| (72) |
Inventors: |
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- Onodera, Ko
Yokohama-shi Kanagawa (JP)
- Ogano, Satoshi
Kawasaki-ku, Kawasaki-shi
Kanagawa 210-8523 (JP)
|
| (74) |
Representative: Troch, Geneviève et al |
|
ExxonMobil Chemical Europe Inc.
I.P. Law Shared Services
P.O. Box 105
Hermeslaan 2
1831 Machelen
1831 Machelen (BE) |
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| |
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| (54) |
Internal-combustion engine lubrican composition |
(57) [PROBLEMS TO BE SOLVED BY THE INVENTION]
To provide a lubricating oil composition excellent in cleanability at high temperature
around a piston in spite of its superlow-ash composition substantially free of ashes
derived from a metal·base dergent, which cannot be realized by conventional techniques.
[MEANS FOR SOLVING THE PROBLEMS]
The lubricating oil composition for internal combustion engines, containing the GCD550°C
+ heavy fraction at 6% by volume or more, and having a sulfated ash content of 0.6%
by mass or less and content of an additive containing a boron-base compound of 0.02%
by mass or more as boron.