| (19) |
 |
|
(11) |
EP 0 737 735 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
22.01.1997 Bulletin 1997/04 |
| (43) |
Date of publication A2: |
|
16.10.1996 Bulletin 1996/42 |
| (22) |
Date of filing: 09.04.1996 |
|
| (51) |
International Patent Classification (IPC)6: C10M 141/12
// C10N30:06,(C10M141/12, 135:18, 139:00) |
|
| (84) |
Designated Contracting States: |
|
BE DE ES FR GB IT NL |
| (30) |
Priority: |
14.04.1995 JP 113903/95
|
| (71) |
Applicant: TONEN CORPORATION |
|
Chiyoda-Ku,
Tokyo 100 (JP) |
|
| (72) |
Inventors: |
|
- Asano, Satoshi
Saitama-ken c/o Maison Suzuki, No. 203 (JP)
- Arai, Katsuya
Iruma-gun,
Saitama-ken (JP)
|
| (74) |
Representative: Fletcher Watts, Susan J. et al |
|
ESSO Engineering (Europe) Limited,
Patents and Licences,
Mailpoint 72,
Esso House,
Ermyn Way
Leatherhead,
Surrey KT22 8XE
Leatherhead,
Surrey KT22 8XE (GB) |
|
| |
|
| (54) |
Lubricant oil composition with reduced friction coefficient |
(57) A lubricant oil composition produced by blending (A) a molybdenum-containing friction
conditioner, (B) a boron-containing compound and (C) an antioxidant if necessary,
with a lubricant base oil, wherein the content of the molybdenum derived from the
molybdenum-containing friction conditioner is 100 to 2,000 ppm (as the ratio by weight)
and the content of the boron derived from the boron-containing compound is 0.015%
by weight or more, to the total weight of the composition. The lubricant oil compositions
of the present invention are the lubricant oil compositions blended with a molybdenum-containing
friction conditioner and a boron-containing compound, and are capable of decreasing
coking deposit in internal combustion engines such as automobile engines, which is
advantageous for sustaining a fuel-efficiency property for a long term. Hence, the
compositions can be used preferably for automobile lubricant oils.