| (19) |
 |
|
(11) |
EP 1 783 198 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
04.07.2007 Bulletin 2007/27 |
| (43) |
Date of publication A2: |
|
09.05.2007 Bulletin 2007/19 |
| (22) |
Date of filing: 11.10.2006 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE
SI SK TR |
|
Designated Extension States: |
|
AL BA HR MK YU |
| (30) |
Priority: |
03.11.2005 EP 05270076
|
| (71) |
Applicant: Infineum International Limited |
|
Abingdon,
Oxfordshire OX13 6BB (GB) |
|
| (72) |
Inventor: |
|
- Scott, Robin Howard,
c/o Infineum UK Ltd.
Abingdon, Oxon, OX13 6BB (GB)
|
| (74) |
Representative: Goddard, Frances Anna |
|
Infineum UK Ltd.
P.O. Box 1
Milton Hill Business &
Technology Centre
Abingdon, Oxfordshire OX13 6BB
Abingdon, Oxfordshire OX13 6BB (GB) |
|
| |
|
| (54) |
Linear diblock copolymers as anti-wear additives for lubricants of internal combustion
engine crankcases |
(57) An internal combustion engine crankcase lubricating oil composition which reduces
the cam and lifter wear has a phosphorus content of not greater than 0.09 mass %,
a metal detergent additive system comprising one or more metal salts of organic carboxylic
acids, and a viscosity index improver comprising a linear diblock copolymer, one block
being derived from a vinyl aromatic hydrocarbon monomer such as styrene and one block
being derived from a diene monomer such as isoprene or butadiene.