(19)

(11)

EP 0 491 714 A1

(12)

(43) Date of publication: 01.07.1992 Bulletin 1992/27 (21) Application number: 90911902.0 (22) Date of filing: 27.07.1990

(51) International Patent Classification (IPC):  B01J 31/ 08( . ) C07C 29/ 141( . ) C07C 29/ 17( . ) C07C 31/ 20( . ) C07C 57/ 145( . ) C07B 61/ 00( . ) C07C 29/ 149( . ) C07C 29/ 80( . ) C07C 51/ 083( . ) (86) International application number: PCT/GB1990/001165 (87) International publication number: WO 1991/001960 (21.02.1991 Gazette 1991/05)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 04.08.1989 GB 19890017859 (71) Applicant: DAVY McKEE (LONDON) LIMITED London, W14 8YW (GB)	(72) Inventors: HILES, Andrew George Pinner, Middlesex HA5 4PH (GB) TUCK, Michael William Marshall London SW16 1QL (GB) (74) Representative: Eyles, Christopher Thomas, et al  W.P. THOMPSON & CO. Celcon House 289-293 High Holborn London WC1V 7HU London WC1V 7HU (GB)