(19)

(11)

EP 1 080 067 A1

(12)

(43) Date of publication: 07.03.2001 Bulletin 2001/10 (21) Application number: 99922373.8 (22) Date of filing: 20.05.1999

(51) International Patent Classification (IPC)7: C07C 233/47, C23F 11/14, C07C 237/22 (86) International application number: PCT/GB9901/602 (87) International publication number: WO 9959/958 (25.11.1999 Gazette 1999/47)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 20.05.1998 GB 9810869 (71) Applicant: THE ASSOCIATED OCTEL COMPANY LIMITED London W1X 6DT (GB)	(72) Inventor: THOMPSON, Russell, Martin Ellesmere Port,Cheshire CH65 4HF (GB) (74) Representative: Matthews, Derek Peter et al Frank B. Dehn & Co.,European Patent Attorneys,179 Queen Victoria Street London EC4V 4EL London EC4V 4EL (GB)