| (19) |
 |
|
(11) |
EP 1 148 114 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
04.12.2002 Bulletin 2002/49 |
| (43) |
Date of publication A2: |
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24.10.2001 Bulletin 2001/43 |
| (22) |
Date of filing: 12.04.2001 |
|
| (51) |
International Patent Classification (IPC)7: C10M 141/10
// (C10M141/10, 129:95, 133:52, 133:56, 137:02, 137:04, 137:08, 137:10), C10N30:06,
C10N40:04, C10N40:08 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
18.04.2000 JP 2000116378
|
| (71) |
Applicant: Chevron Oronite Japan Limited |
|
Tokyo (JP) |
|
| (72) |
Inventors: |
|
- Takayama, Himiko
Haibara-gun, Shizuoka, 421-0601 (JP)
- Umehara, Katsumi
Haibara-gun, Shizuoka, 421-0421 (JP)
|
| (74) |
Representative: Nash, David Allan et al |
|
Haseltine Lake & Co., Imperial House, 15-19 Kingsway
London WC2B 6UD
London WC2B 6UD (GB) |
|
| |
|
| (54) |
Lubricating oil compositions having excellent thermal stabilty, extreme pressure resistance
and anti-wear performance |
(57) The present invention relates to a lubricating oil composition for use in industrial
oils such as hydraulic oils, bearing oils, industrial gear oils and sliding surface
lubricating oils.
In its broadest aspect, the present invention comprises a lubricating oil composition
having a major amount of a base oil of lubricating viscosity and a minor, but effective
amount, of
- A. at least one a compound selected from the group consisting of a phosphoric acid
ester, a thiophosphoric acid ester, and amine salts thereof;
- B. a phosphorus acid ester and/or an amine thereof; and
- C. at least one compound selected from the group consisting of an alkenyl succinimide,
an alkenyl succinic acid ester, benzylamine, and derivatives thereof.
The lubricating oil composition of the present invention provides excellent thermal
stability, extreme pressure resistance and anti-wear performance.