(19)

(11)

EP 1 490 461 A2

(12)

(88) Date of publication A3: 22.01.2004 (43) Date of publication: 29.12.2004 Bulletin 2004/53 (21) Application number: 03721631.4 (22) Date of filing: 28.03.2003

(51) International Patent Classification (IPC)7: C10M 163/00, C10M 167/00, C10L 1/22, C10N 40/25 (86) International application number: PCT/US2003/011199 (87) International publication number: WO 2003/083020 (09.10.2003 Gazette 2003/41)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 28.03.2002 US 368354 P 17.01.2003 US 441012 P (71) Applicant: THE LUBRIZOL CORPORATION Wickliffe,Ohio 44092-2298 (US)

(72) Inventors: MACKNEY, Derek W. Belper,Derbyshire DE56 4DX (GB) MACDUFF, Malcolm G. J. Quarndon,Derbyshire DE22 5JW (GB) ARTERS, David C. Repton,Derbyshire DE65 6FN (GB) BARBOUR, Robert H. Ashbourne,Derbyshire DE6 1PW (GB) CALDER, Raymond M. Allestree,Derbyshire DE22 2 RZ (GB) DUNCAN, David A. Mentor, OH 44060 (US) DOGLIO, James A. Mentor, OH 44060 (US) JACKSON, Mitchell M. Chagrin Falls, OH 44022 (US) DALY, Daniel T. Solon, OH 44139 (US) LAMB, Gordon D. Southend Bradfield,Berkshire RG7 6ES (GB) (74) Representative: Bradley, Josephine Mary et al D Young & Co120 Holborn London EC1N 2DY London EC1N 2DY (GB)