| (19) |
 |
|
(11) |
EP 0 240 813 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
13.12.1989 Bulletin 1989/50 |
| (43) |
Date of publication A2: |
|
14.10.1987 Bulletin 1987/42 |
| (22) |
Date of filing: 21.03.1987 |
|
| (51) |
International Patent Classification (IPC)4: C10M 111/04
// (C10M111/04, 101:02, 107:10), C10N40:00 |
|
| (84) |
Designated Contracting States: |
|
BE CH DE FR GB IT LI NL SE |
| (30) |
Priority: |
31.03.1986 JP 71366/86
|
| (71) |
Applicant: IDEMITSU KOSAN COMPANY LIMITED |
|
Tokyo (JP) |
|
| (72) |
Inventor: |
|
- Watanabe, Noboru
Ichihara-shi
Chiba-ken (JP)
|
| (74) |
Representative: Türk, Gille, Hrabal, Leifert |
|
Brucknerstrasse 20
40593 Düsseldorf
40593 Düsseldorf (DE) |
|
| |
|
| (54) |
A lubricating oil composition |
(57) The lubricating oil composition comprises 15-85 parts by weight of a poly-a-olefin
having a kinematic viscosity of 1.5-150 centistokes at 100°C and 85-15 parts by weight
of a mineral oil having a kinetic viscosity of 2-50 centistokes at 100°C and a pour
point of -35°C or below. By virtue of the admixture of the mineral oil, the lubricant
oil composition is much more inexpensive than the poly-a-olefin per se while retaining
the excellent properties inherent in the poly-a-olefins such as the stability against
oxidation, low-temperature performance, high-temperature cleanness and friction characteristics
with wet clutches.