(19)

(11)

EP 0 754 091 A1

(12)

(43) Date of publication: 22.01.1997 Bulletin 1997/04 (21) Application number: 94923148.0 (22) Date of filing: 04.04.1994

(51) International Patent Classification (IPC):  B01J 8/ 00( . ) C22B 34/ 12( . ) B01J 8/ 32( . ) (86) International application number: PCT/US1994/003671 (87) International publication number: WO 1995/026809 (12.10.1995 Gazette 1995/43)

(84) Designated Contracting States: BE DE GB NL (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventors: ABED, Ran Wilmington, DE 19803 (US) REEVES, James, W. Wilmington, DE 19810-4426 (US) (74) Representative: Woodcraft, David Charles  BROOKES & MARTIN High Holborn House 52/54 High Holborn London, WC1V 6SE London, WC1V 6SE (GB)