(19)

(11)

EP 0 400 013 A1

(12)

(43) Date of publication: 05.12.1990 Bulletin 1990/49 (21) Application number: 89900156.0 (22) Date of filing: 18.11.1988

(51) International Patent Classification (IPC):  A01N 47/ 36( . ) C07D 521/ 00( . ) (86) International application number: PCT/US1988/003993 (87) International publication number: WO 1989/004605 (01.06.1989 Gazette 1989/12)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 20.11.1987 US 19870123481 20.11.1987 US 19870123482 01.08.1988 US 19880226934 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventors: AMUTI, Kofi, Sam Wilmington, DE 19808 (US) LEEP, Daniel, Carl Newark, DE 19711 (US) WEXLER, Barry, Arthur Wilmington, DE 19810 (US) (74) Representative: Hildyard, Edward Martin, et al  Frank B. Dehn & Co. European Patent Attorneys Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)