(19)

(11)

EP 0 681 625 A1

(12)

(43) Date of publication: 15.11.1995 Bulletin 1995/46 (21) Application number: 94907926.0 (22) Date of filing: 31.01.1994

(51) International Patent Classification (IPC):  C01B 15/ 08( . ) D21C 9/ 16( . ) D21C 9/ 10( . ) D21H 11/ 00( . ) (86) International application number: PCT/US1994/001085 (87) International publication number: WO 1994/018386 (18.08.1994 Gazette 1994/19)

(84) Designated Contracting States: BE DE ES FR GB IT PT SE (30) Priority: 01.02.1993 US 19930012057 (71) Applicants: SOLVAY INTEROX Houston, TX 77227 (US) THE RESEARCH FOUNDATION OF STATE UNIVERSITY OF NEW YORK Albany, New York 12201-0009 (US)	(72) Inventors: FRANCIS, Raymond, C. DeWitt, NY 13214 (US) NICHOLSON, Daniel, J. Syracuse, NY 13210 (US) TROUGHTON, Nicholas, A. B-1020 Brussels (BE) (74) Representative: KUHNEN, WACKER & PARTNER  Alois-Steinecker-Strasse 22 D-85354 Freising D-85354 Freising (DE)