(19)

(11)

EP 1 000 138 A1

(12)

(43) Date of publication: 17.05.2000 Bulletin 2000/20 (21) Application number: 98938097.7 (22) Date of filing: 30.07.1998

(51) International Patent Classification (IPC)7: C11D 17/00, C11D 3/43, C11D 1/12, C11D 3/20 (86) International application number: PCT/US9815/744 (87) International publication number: WO 9906/520 (11.02.1999 Gazette 1999/06)

(84) Designated Contracting States: AT BE DE DK ES FI FR GB IT NL PT SE (30) Priority: 31.07.1997 US 904166 30.03.1998 US 50307 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY WilmingtonDelaware 19898 (US)	(72) Inventors: KALER, Eric, W. Newark, DE 19711 (US) KRIZAN, Timothy, Donald Wilmington, DE 19810 (US) RYAN, Larry, D. Newark, DE 19711 (US) VETHAMUTHU, Martin, Swanson Newark, DE 19711 (US) (74) Representative: Jones, Alan John et al CARPMAELS & RANSFORD43 Bloomsbury Square London, WC1A 2RA London, WC1A 2RA (GB)