(19)

(11)

EP 0 480 927 A1

(12)

(43) Date of publication: 22.04.1992 Bulletin 1992/17 (21) Application number: 90901623.0 (22) Date of filing: 10.01.1990

(51) International Patent Classification (IPC):  A01N 63/ 00( . ) (86) International application number: PCT/GB1990/000033 (87) International publication number: WO 1991/000012 (10.01.1991 Gazette 1991/02)

(84) Designated Contracting States: BE CH DE DK FR GB IT LI NL (30) Priority: 28.06.1989 GB 19890014802 (71) Applicant: IMPERIAL CHEMICAL INDUSTRIES PLC London SW1P 3JF (GB)	(72) Inventor: IMPERIAL CHEMICAL INDUSTRIES PLC London SW1P 3JF (GB) (74) Representative: Bishop, Nigel Douglas, et al  ICI Group Patents Services Dept. PO Box 6 Shire Park Bessemer Road Welwyn Garden City Herts, AL7 1HD Welwyn Garden City Herts, AL7 1HD (GB)