(19)

(11)

EP 1 833 948 A1

(12)

(43) Date of publication: 19.09.2007 Bulletin 2007/38 (21) Application number: 05850497.8 (22) Date of filing: 23.12.2005

(51) International Patent Classification (IPC):  C10L 1/08(2006.01) C10L 10/02(2006.01) (86) International application number: PCT/EP2005/057156 (87) International publication number: WO 2006/067233 (29.06.2006 Gazette 2006/26)

(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 (30) Priority: 23.12.2004 EP 04258093 12.04.2005 EP 05252267 (71) Applicant: Shell Internationale Research Maatschappij B.V. 2596 HR The Hague (NL)

(72) Inventors: CLAYTON, Christopher William Chester, Cheshire CH2 4NU (GB) DAHLSTROM, Mary Ann Katy, Texas 77450 (US) LEE, George Robert Cheshire CH2 4NU (GB) PRICE, Richard John Chester, Cheshire CH2 4NU (GB) SMITH, Susan Jane Chester, Cheshire CH2 4NU (GB) TAIT, Nigel Peter Chester, Cheshire CH2 4NU (GB) WALLINGTON, Jessica F Chester, Cheshire CH2 4NU (GB) (74) Representative: Zeestraten, Albertus W. J.  Shell International B.V. P.O. Box 384 NL-2501 CJ The Hague NL-2501 CJ The Hague (NL)