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(11)

EP 2 126 013 A1

(12)

(43) Date of publication: 02.12.2009 Bulletin 2009/49 (21) Application number: 07848575.2 (22) Date of filing: 17.12.2007

(51) International Patent Classification (IPC):  C10M 129/40(2006.01) C10M 135/10(2006.01) C10M 137/12(2006.01) C10M 141/10(2006.01) C10N 40/04(2006.01) C10M 133/06(2006.01) C10M 137/04(2006.01) C10M 141/08(2006.01) C10N 30/06(2006.01) C10N 40/25(2006.01) (86) International application number: PCT/GB2007/004838 (87) International publication number: WO 2008/075016 (26.06.2008 Gazette 2008/26)

(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 MT NL PL PT RO SE SI SK TR (30) Priority: 20.12.2006 EP 06256446 (71) Applicant: Castrol Limited Swindon Wiltshire SN3 1RE (GB)	(72) Inventors: RITCHIE, Craig Reading West Berkshire RG31 7AY (GB) SEDDON, Kenneth Richard Donaghadee County Down BT21 0LA (GB) (74) Representative: Perkins, Nicholas David et al BP International Limited Global Patents & Technology Law Chertsey Road Sunbury-on-Thames, Middlesex TW16 7LN Sunbury-on-Thames, Middlesex TW16 7LN (GB)