| (19) |
 |
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(11) |
EP 2 161 325 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
07.04.2010 Bulletin 2010/14 |
| (43) |
Date of publication A2: |
|
10.03.2010 Bulletin 2010/10 |
| (22) |
Date of filing: 24.08.2009 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO
PL PT RO SE SI SK SM TR |
|
Designated Extension States: |
|
AL BA RS |
| (30) |
Priority: |
28.08.2008 US 199968
|
| (71) |
Applicant: Afton Chemical Corporation |
|
Richmond, VA 23219 (US) |
|
| (72) |
Inventors: |
|
- Sheets, Roger M.
Glen Allen, VA 23060 (US)
- Guinther, Gregory H.
Richmond, VA 23233 (US)
- Loper, John T.
Richmond, VA 23238 (US)
|
| (74) |
Representative: Dunleavy, Kevin James |
|
Knoble & Yoshida LLC
p/o De Vries & Metman
Overschiestraat 180
1062 XK Amsterdam
1062 XK Amsterdam (NL) |
|
| |
|
| (54) |
Lubricant formulations and methods of lubricating a combustion system to achieve improved
emissions catalyst durability |
(57) Different zinc dialkyldithiophosphate (ZDDPs) exhibit different volatilities and
have different effects on automotive emissions control catalysts. The ZDDPs and their
respective decomposition fragments that have low volatility will have a correspondingly
lower detrimental effect on combustion emissions control systems, because there are
simply fewer phosphorous atoms that will pass through the combustion system to reach
the emissions control system. Specifically, it has been discovered that ZDDPs that
contain a significant fraction of MIBC ZDDP exhibit significantly lower volatility
than other ZDDPs.