(19)

(11)

EP 1 497 398 A2

(12)

(88) Date of publication A3: 01.04.2004 (43) Date of publication: 19.01.2005 Bulletin 2005/03 (21) Application number: 03722551.3 (22) Date of filing: 24.04.2003

(51) International Patent Classification (IPC)7: C10L 1/08, C10L 1/16, C10L 10/00, C10L 10/06 (86) International application number: PCT/EP2003/004359 (87) International publication number: WO 2003/091364 (06.11.2003 Gazette 2003/45)

(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: 25.04.2002 EP 02252946 (71) Applicant: SHELL INTERNATIONALE RESEARCHMAATSCHAPPIJ B.V. 2596 HR Den Haag (NL)	(72) Inventors: CLARK, Richard Hugh Cheshire CH2 4NU (GB) MILLINGTON, Christopher Russell Cheshire CH2 4NU (GB) WILLIAMS, Rodney Glyn Cheshire CH2 4NU (GB) MATCHETT, Steven Douthwaite Waterloo, London SE1 7NA (GB)