(19)

(11)

EP 1 684 886 A1

(12)

(43) Date of publication: 02.08.2006 Bulletin 2006/31 (21) Application number: 04800365.1 (22) Date of filing: 19.11.2004

(51) International Patent Classification (IPC):  B01D 15/08(2006.01) G01N 30/50(2006.01) (86) International application number: PCT/SE2004/001703 (87) International publication number: WO 2005/049171 (02.06.2005 Gazette 2005/22)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 21.11.2003 US 523695 P 26.11.2003 EP 03445139 (71) Applicant: Akzo Nobel N.V. 6800 SB Arnhem (NL)	(72) Inventors: WINKEL PETTERSSON, Sylvia S-426 72 VÄSTRA FRÖLUNDA (SE) PERSSON, Börje S-424 38 AGNESBERG (SE) NYSTRÖM, Mats S-442 52 YTTERBY (SE) (74) Representative: Jönsson, Christer  Intellectual Property Eka Chemicals AB P.O. Box 11556 100 61 Stockholm 100 61 Stockholm (SE)