(19)

(11)

EP 1 954 872 A1

(12)

(43) Date of publication: 13.08.2008 Bulletin 2008/33 (21) Application number: 06807988.8 (22) Date of filing: 10.11.2006

(51) International Patent Classification (IPC):  D21C 9/00(2006.01) (86) International application number: PCT/FI2006/000362 (87) International publication number: WO 2007/054610 (18.05.2007 Gazette 2007/20)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 11.11.2005 FI 20051145 (71) Applicant: Kemira Oyj 00180 Helsinki (FI)	(72) Inventors: MYLLYMÄKI, Vesa FI-00200 Helsinki (FI) AKSELA, Reijo FI-02360 Espoo (FI) (74) Representative: Määttä, Jukka Tapani et al Berggren Oy Ab Lentokatu 2 90460 Oulunsalo 90460 Oulunsalo (FI)