| (19) |
 |
|
(11) |
EP 0 881 276 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
08.09.1999 Bulletin 1999/36 |
| (43) |
Date of publication A2: |
|
02.12.1998 Bulletin 1998/49 |
| (22) |
Date of filing: 29.05.1998 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
30.05.1997 JP 157887/97
31.03.1998 JP 104090/98
|
| (71) |
Applicant: TONEN CORPORATION |
|
Chiyoda-Ku,
Tokyo 100 (JP) |
|
| (72) |
Inventors: |
|
- Taguchi, Shigeko
Kawagoe City,
Saitama (JP)
- Ono, Megumi
Tachikawa City,
Tokyo (JP)
- Tomizawa, Hirotaka
Tokorozawa City,
Tokyo (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) |
Lubricating oil composition containing a mixture of metal salts of aromatic organic
acids |
(57) To provide a novel lubricating oil composition containing an organic acid metal salt
having excellent friction coefficient reducing effects.
A lubricating oil composition comprising a lubricating base stock and an effective
amount of a mixture of metal salts of chain-hydrocarbon-group-substituted aromatic
organic acids. Each of the aromatic groups has been substituted by at least one chain
hydrocarbon group. The number of chain hydrocarbon groups each carrying at C-2 or
C-3 thereof the associated aromatic group bonded thereto is in a range of from 30%
to 90% of the total number of the chain hydrocarbon groups.