(19)

(11)

EP 1 791 784 A1

(12)

(43) Date of publication: 06.06.2007 Bulletin 2007/23 (21) Application number: 05778039.7 (22) Date of filing: 06.09.2005

(51) International Patent Classification (IPC):  C01B 11/02(2006.01) (86) International application number: PCT/SE2005/001288 (87) International publication number: WO 2006/033609 (30.03.2006 Gazette 2006/13)

(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 Designated Extension States: HR YU (30) Priority: 24.09.2004 EP 04445100 (71) Applicants: Akzo Nobel N.V. 6800 SB Arnhem (NL) Eka Chemicals AB 445 80 Bohus (SE) SE	(72) Inventor: JOHANSSON, Maria, Kristina S-120 68 Stockholm (SE) (74) Representative: Jönsson, Christer  Intellectual Property Eka Chemicals AB P.O. Box 11556 100 61 Stockholm 100 61 Stockholm (SE)