(19)

(11)

EP 0 906 323 A1

(12)

(43) Date of publication: 07.04.1999 Bulletin 1999/14 (21) Application number: 97925147.0 (22) Date of filing: 05.06.1997

(51) International Patent Classification (IPC):  C07F 17/ 00( . ) C08F 4/ 659( . ) C08F 10/ 00( . ) C08F 4/ 6592( . ) (86) International application number: PCT/GB1997/001519 (87) International publication number: WO 1997/046567 (11.12.1997 Gazette 1998/01)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 06.06.1996 GB 19960012130 (71) Applicant: BP Chemicals Limited London EC2M 7BA (GB)	(72) Inventors: CLOKE, Frederick, Geoffrey, Nethersole Brighton BN1 6FD (GB) PERON, Daniel Brighton BN1 2PD (GB) (74) Representative: Preece, Michael, et al  BP International Limited Group Patents & Agreements, Chertsey Road Sunbury-on-Thames, Middlesex, TW16 7LN Sunbury-on-Thames, Middlesex, TW16 7LN (GB)