| (19) |
 |
|
(11) |
EP 1 531 176 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
06.07.2005 Bulletin 2005/27 |
| (43) |
Date of publication A2: |
|
18.05.2005 Bulletin 2005/20 |
| (22) |
Date of filing: 08.11.2004 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK
TR |
|
Designated Extension States: |
|
AL HR LT LV MK YU |
| (30) |
Priority: |
06.11.2003 US 702971
|
| (71) |
Applicant: Afton Chemical Corporation |
|
Richmond, VA 23219 (US) |
|
| (72) |
Inventors: |
|
- Loper, John T.
Richmond, Virginia 23233 (US)
- Venhaus, David A.
Glen Allen, Virginia 23059 (US)
- Lam, William Y.
Glen Allen, Virginia 23059 (US)
|
| (74) |
Representative: Cresswell, Thomas Anthony |
|
J.A. KEMP & CO. 14 South Square Gray's Inn
London WC1R 5JJ
London WC1R 5JJ (GB) |
|
| |
|
| (54) |
Hydrocarbyl substituted dispersants and compositions containing the dispersants |
(57) A dispersant for use as a lubricant additive, a lubricant composition and a method
for improving engine performance. The dispersant includes at least one member selected
from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted
amines, and Mannich base adducts derived from hydrocarbyl-substituted phenols condensed
with aldehydes and amines. The hydrocarbyl substituent is composed of a polymerization
product of a raffinate I stream and isobutylene having a number average molecular
weight ranging from about 500 to about 3000 as determined by gel permeation chromatography
and more than about 70 mol percent of the polymerization product having a terminal
vinylidene group.