(19)

(11)

EP 1 633 910 A2

(12)

(88) Date of publication A3: 24.03.2005 (43) Date of publication: 15.03.2006 Bulletin 2006/11 (21) Application number: 04736292.6 (22) Date of filing: 07.06.2004

(51) International Patent Classification (IPC):  C25B 11/00(1974.07) (86) International application number: PCT/SE2004/000885 (87) International publication number: WO 2004/111310 (23.12.2004 Gazette 2004/52)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 19.06.2003 EP 03445079 (71) Applicants: Akzo Nobel N.V. 6800 SB Arnhem (NL) Eka Chemicals AB 445 80 Bohus (SE) SE	(72) Inventor: SHIMAMUNE, Takayuki Machida-City, Tokyo 194-0022 (JP) (74) Representative: Vikholm, Tommy  Eka Chemicals AB, Patent Department, P.O. Box 11556 100 61 Stockholm 100 61 Stockholm (SE)