| (19) |
 |
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(11) |
EP 1 262 538 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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05.11.2003 Bulletin 2003/45 |
| (43) |
Date of publication A2: |
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04.12.2002 Bulletin 2002/49 |
| (22) |
Date of filing: 02.05.2002 |
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| (51) |
International Patent Classification (IPC)7: C10M 159/20, C10M 159/22, C10M 129/54, C10M 129/10, C10M 135/30, C10M 169/04, C10M 141/02, C10M 163/00
// (C10N10/04, 30:10, 30:12, 40:25) |
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Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
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Designated Extension States: |
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AL LT LV MK RO SI |
| (30) |
Priority: |
11.05.2001 EP 01201752
30.11.2001 GB 0128734
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| (71) |
Applicant: Infineum International Limited |
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Abingdon, Oxfordshire OX13 6BB (GB) |
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| (72) |
Inventors: |
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- Locke, Christopher John
Wantage, Oxon OX12 9YF (GB)
- Stevens, Mark
Netuchen, New Jersey 08840 (US)
- Wrench, Peter
Grove, Wantage, Oxon OX12 7LX (GB)
- Castle, Rebecca Claro
Milton Hill, Abingdon OX13 6BB (GB)
- Arrowsmith, Stephen
Oxon, Oxfordshire OX11 9RA (GB)
- Galsworthy, Jane Rachel
Abingdon, Oxon OX14 3GH (GB)
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| (74) |
Representative: Mansell, Keith Rodney et al |
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Infineum International Limited, P.O. Box 1, Milton Hill
Abingdon, Oxfordshire OX13 6BB
Abingdon, Oxfordshire OX13 6BB (GB) |
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| (54) |
Anti-wear and anti-oxidant additives for lubricating oil compositions |
(57) The use, in a minor amount, of a detergent composition comprising one or more metal
detergents which comprises metal salts of organic acids, wherein the detergent composition
comprises more than 50 mole %, based on the moles of the metal salts of organic acids
in the detergent composition, of:
- (I) a metal salt of an aromatic carboxylic acid, or
- (II) a metal salt of a phenol, or
- (III) both a metal salt of an aromatic carboxylic acid and a metal salt of a phenol,
in a lubricating oil composition for improving the oxidation resistance of the lubricating
oil composition, wherein the amount of phosphorus and sulfur in the oil composition
is less than 0.09 mass % and at most 0.5 mass % respectively, based on the mass of
the oil composition. It has also been found that a detergent composition comprising
more than 50 mole % of a metal salt of an aromatic carboxylic acid improves the reduction
in wear in an engine.