(19)

(11)

EP 0 731 887 A1

(12)

(43) Date of publication: 18.09.1996 Bulletin 1996/38 (21) Application number: 95904070.0 (22) Date of filing: 22.11.1994

(51) International Patent Classification (IPC):  F16J 15/ 00( . ) F16J 15/ 02( . ) F16L 17/ 06( . ) C09K 3/ 10( . ) F16J 15/ 10( . ) (86) International application number: PCT/US1994/013195 (87) International publication number: WO 1995/015452 (08.06.1995 Gazette 1995/24)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 01.12.1993 EP 19930119321 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventors: BOWERS, Stephen CH-1197 Prangins (CH) CHESNEL, Philippe F-91570 Bièvres (FR) (74) Representative: von Kreisler, Alek, Dipl.-Chem.  Patentanwälte, von Kreisler-Selting-Werner, Bahnhofsvorplatz 1 (Deichmannhaus) 50667 Köln 50667 Köln (DE)