(19)

(11)

EP 0 630 491 A1

(12)

(43) Date of publication: 28.12.1994 Bulletin 1994/52 (21) Application number: 92915327.0 (22) Date of filing: 12.03.1992

(51) International Patent Classification (IPC):  G03C 1/ 10( . ) (86) International application number: PCT/US1992/001690 (87) International publication number: WO 1993/018434 (16.09.1993 Gazette 1993/22)

(84) Designated Contracting States: BE DE FR GB IT (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventor: LeSTRANGE, Raymond, Joseph Hendersonville, NC 28792 (US) (74) Representative: von Kreisler, Alek, Dipl.-Chem., et al  Patentanwälte, von Kreisler-Selting-Werner, Bahnhofsvorplatz 1 (Deichmannhaus) D-50667 Köln D-50667 Köln (DE)