| (19) |
 |
|
(11) |
EP 1 191 090 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
05.06.2002 Bulletin 2002/23 |
| (43) |
Date of publication A2: |
|
27.03.2002 Bulletin 2002/13 |
| (22) |
Date of filing: 19.09.2001 |
|
| (51) |
International Patent Classification (IPC)7: C10M 169/04
// (C10M169/04, 101:02, 129:72, 143:04, 143:06, 143:08, 143:08, 143:12) |
|
| (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: |
19.09.2000 US 665568
|
| (71) |
Applicant: ETHYL CORPORATION |
|
Richmond, Virginia 23219-4304 (US) |
|
| (72) |
Inventor: |
|
- Balasubramanian, Vasudevan
Montpelier, Virginia 23192 (US)
|
| (74) |
Representative: Cresswell, Thomas Anthony |
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J.A. Kemp & Co. 14 South Square Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB) |
|
| |
|
| (54) |
Gear oil formulations having enhanced perfomance |
(57) A lubricant composition suitable for use as an automotive or industrial gear lubricant
comprising:
- (A) from about 40 to about 70 wt. %, based on the total weight of the lubricant composition,
of a mineral oil;
- (B) from about 2 to about 20 wt. %, based on the total weight of the lubricant composition,
of at least one selected from vinyl aromatic-diene copolymers, olefin copolymers and
mixtures thereof;
- (C) from about 2 to about 20 wt. %, based on the total weight of the lubricant composition,
of at least one polyalphaolefin having a kinematic viscosity of at least 40 cSt at
100°C; and
- (D) from about 3 to about 20 wt. %, based on the total weight of the lubricant composition,
of a gear additive package;
wherein the lubricant composition has a Viscosity Index of greater than 140.