(19)

(11)

EP 0 882 151 A1

(12)

(43) Date of publication: 09.12.1998 Bulletin 1998/50 (21) Application number: 97903408.0 (22) Date of filing: 19.02.1997

(51) International Patent Classification (IPC):  D21C 9/ 10( . ) D21C 9/ 16( . ) (86) International application number: PCT/FI1997/000106 (87) International publication number: WO 1997/030208 (21.08.1997 Gazette 1997/36)

(84) Designated Contracting States: AT DE ES FR PT SE (30) Priority: 19.02.1996 FI 19960000756 (71) Applicant: KEMIRA CHEMICALS OY 00101 Helsinki (FI)	(72) Inventors: RENVALL, Ilkka FIN-02300 Espoo (FI) AKSELA, Reijo FIN-02360 Espoo (FI) PAREN, Aarto FIN-37630 Valkeakoski (FI) (74) Representative: Saijonmaa, Olli-Pekka  Berggren Oy Ab, P.O. Box 16 00101 Helsinki 00101 Helsinki (FI)