(19)

(11)

EP 1 856 233 A1

(12)

(43) Date of publication: 21.11.2007 Bulletin 2007/47 (21) Application number: 06709875.6 (22) Date of filing: 24.02.2006

(51) International Patent Classification (IPC):  C10M 137/04(2006.01) (86) International application number: PCT/GB2006/000643 (87) International publication number: WO 2006/092560 (08.09.2006 Gazette 2006/36)

(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: 04.03.2005 GB 0504496 (71) Applicant: IMPERIAL CHEMICAL INDUSTRIES PLC London W1V 3AN (GB)	(72) Inventors: BOYDE, Stephen Cleveland TS14 6LA (GB) THOMPSON, Robert, Ian George Cleveland TS10 4NJ (GB) (74) Representative: Humphries, Martyn et al Croda Intellectual Property Department Wilton Centre Wilton Redcar TS10 4RF Redcar TS10 4RF (GB)