(19)

(11)

EP 0 575 541 A1

(12)

(43) Date of publication: 29.12.1993 Bulletin 1993/52 (21) Application number: 92909109.0 (22) Date of filing: 09.03.1992

(51) International Patent Classification (IPC):  D06P 3/ 24( . ) (86) International application number: PCT/US1992/001866 (87) International publication number: WO 1992/015750 (17.09.1992 Gazette 1992/24)

(84) Designated Contracting States: BE CH DE ES FR GB IT LI (30) Priority: 11.03.1991 US 19910667726 (71) Applicant: HOECHST CELANESE CORPORATION Somerville, N.J. 08876 (US)	(72) Inventor: KELLEY, Larry, C. Dalton, GA 30720 (US) (74) Representative: De Minvielle-Devaux, Ian Benedict Peter, et al  CARPMAELS & RANSFORD 43, Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)