(19)

(11)

EP 0 532 596 A1

(12)

(43) Date of publication: 24.03.1993 Bulletin 1993/12 (21) Application number: 91910820.0 (22) Date of filing: 03.06.1991

(51) International Patent Classification (IPC):  B01J 23/ 20( . ) C07C 17/ 08( . ) C07C 17/ 10( . ) C07C 17/ 21( . ) C07B 61/ 00( . ) C07C 17/ 087( . ) C07C 17/ 20( . ) C07C 19/ 08( . ) (86) International application number: PCT/US1991/003661 (87) International publication number: WO 1991/018853 (12.12.1991 Gazette 1991/28)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 04.06.1990 US 19900532617 (60) Divisional application: 98120061.1 / 0911310 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventor: NAPPA, Mario, Joseph Newark, DE 19711 (US) (74) Representative: Woodcraft, David Charles  BROOKES & MARTIN High Holborn House 52/54 High Holborn London, WC1V 6SE London, WC1V 6SE (GB)