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(11)

EP 0 536 315 A1

(12)

(43) Date of publication: 14.04.1993 Bulletin 1993/15 (21) Application number: 91913502.0 (22) Date of filing: 21.06.1991

(51) International Patent Classification (IPC):  D01F 6/ 60( . ) D02J 1/ 22( . ) D02J 1/ 08( . ) (86) International application number: PCT/US1991/004244 (87) International publication number: WO 1991/019839 (26.12.1991 Gazette 1991/29)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 21.06.1990 US 19900541692 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventors: BOLES, Raymond, Leslie, Jr. Hixson, TN 37343 (US) KEENE, Lee, Waid Seaford, DE 19973 (US) KNOX, Benjamin, H. Wilmington, DE 19808 (US) NUGENT, Ralph, Walter Seaford, DE 19973 (US) (74) Representative: Abitz, Walter, Dr.-Ing.  Patentanwälte Abitz & Partner Postfach 86 01 09 D-81628 München D-81628 München (DE)