(19) |
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(11) |
EP 1 783 198 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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04.07.2007 Bulletin 2007/27 |
(43) |
Date of publication A2: |
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09.05.2007 Bulletin 2007/19 |
(22) |
Date of filing: 11.10.2006 |
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(51) |
International Patent Classification (IPC):
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(84) |
Designated Contracting States: |
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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 |
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Designated Extension States: |
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AL BA HR MK YU |
(30) |
Priority: |
03.11.2005 EP 05270076
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(71) |
Applicant: Infineum International Limited |
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Abingdon,
Oxfordshire OX13 6BB (GB) |
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(72) |
Inventor: |
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- Scott, Robin Howard,
c/o Infineum UK Ltd.
Abingdon, Oxon, OX13 6BB (GB)
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(74) |
Representative: Goddard, Frances Anna |
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Infineum UK Ltd.
P.O. Box 1
Milton Hill Business &
Technology Centre Abingdon, Oxfordshire OX13 6BB Abingdon, Oxfordshire OX13 6BB (GB) |
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(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.