(19)

(11)

EP 0 516 690 A1

(12)

(43) Date of publication: 09.12.1992 Bulletin 1992/50 (21) Application number: 91904787.0 (22) Date of filing: 29.01.1991

(51) International Patent Classification (IPC):  C07C 17/ 20( . ) C07C 19/ 08( . ) (86) International application number: PCT/US1991/000442 (87) International publication number: WO 1991/013048 (05.09.1991 Gazette 1991/21)

(84) Designated Contracting States: DE ES FR GB GR IT NL (30) Priority: 02.03.1990 US 19900487466 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventors: FERNANDEZ, Richard, Edward Bear, DE 19701 (US) GUMPRECHT, William, Henry Wilmington, DE 19808 (US) (74) Representative: Woodcraft, David Charles, et al  BROOKES & MARTIN High Holborn House 52/54 High Holborn London, WC1V 6SE London, WC1V 6SE (GB)