| (19) |
 |
|
(11) |
EP 0 678 569 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
03.04.1996 Bulletin 1996/14 |
| (43) |
Date of publication A2: |
|
25.10.1995 Bulletin 1995/43 |
| (22) |
Date of filing: 18.04.1995 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE ES FR GB IT SE |
| (30) |
Priority: |
19.04.1994 US 229488
|
| (71) |
Applicant: THE LUBRIZOL CORPORATION |
|
Wickliffe,
Ohio 44092-2298 (US) |
|
| (72) |
Inventors: |
|
- Schnur, Eric R.
Mentor,
Ohio 44060 (US)
- Richardson, Robert C.
Mentor,
Ohio 44060 (US)
- Schwind, James J.
Doveridge DE6 5NN,
Derbyshire (GB)
|
| (74) |
Representative: Crisp, David Norman et al |
|
D. YOUNG & CO.
21 New Fetter Lane
London EC4A 1DA
London EC4A 1DA (GB) |
|
| |
|
| (54) |
Lubricating compositions with improved oxidation resistance containing a dispersant
and an antioxidant |
(57) This invention relates to a lubricating composition comprising a major amount of
an oil of lubricating viscosity with an iodine number less than about 9, (A) one or
more antioxidant, and (B) from about 0.01% to about 3% by weight of at least one dispersant
or detergent, wherein the total amount of antioxidant is at least about 2% by weight.
The additives are useful act controlling oxidation of lubricants. Further, these lubricants
have reduced viscosity increase caused by oxidation, while maintaining favorable carbon/varnish
ratings.