| (19) |
 |
|
(11) |
EP 1 452 581 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
22.12.2004 Bulletin 2004/52 |
| (43) |
Date of publication A2: |
|
01.09.2004 Bulletin 2004/36 |
| (22) |
Date of filing: 06.02.2004 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
Designated Extension States: |
|
AL LT LV MK |
| (30) |
Priority: |
27.02.2003 US 377915
|
| (71) |
Applicant: Chevron Oronite Technology B.V. |
|
3196 KD Vondelingenplaat, Rotterdam (NL) |
|
| (72) |
Inventor: |
|
- Van Leeuwen, Jeroen
2993 DX Barendrecht (NL)
|
| (74) |
Representative: Nash, David Allan |
|
HASELTINE LAKE, Redcliff Quay 120 Redcliff Street
Bristol BS1 6HU
Bristol BS1 6HU (GB) |
|
| |
|
| (54) |
Method for improving elastomer compatibility |
(57) This invention relates to a method of improving elastomer seal compatibility and
dispersancy in an internal combustion engine by contacting the elastomer seal in the
internal combustion engine with a lubricating oil composition comprising:
- a) a major amount of a base oil of lubricating viscosity;
- b) a carboxylated detergent-dispersant obtained by:(i) neutralizing alkylphenols using
an alkaline earth base in the presence of at least one carboxylic acid that contains
from one to four carbon atoms but in the absence of alkali base, dialcohol, and monoalcohol,
forming an intermediate product; and(ii) carboxylating the intermediate product using
carbon dioxide so that at least 20 mole percent of the original alkylphenol starting
material has been converted to alkaline earth metal single aromatic-ring hydrocarbyl
salicylate; and
- c) a nitrogen-containing dispersant.