(19)

(11)

EP 2 655 692 A1

(12)

(43) Date of publication: 30.10.2013 Bulletin 2013/44 (21) Application number: 11802908.1 (22) Date of filing: 19.12.2011

(51) International Patent Classification (IPC):  C25B 1/26(2006.01) (86) International application number: PCT/EP2011/073167 (87) International publication number: WO 2012/084765 (28.06.2012 Gazette 2012/26)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 22.12.2010 EP 10196408 22.12.2010 US 201061425927 P (71) Applicant: Akzo Nobel Chemicals International B.V. 3811 MH Amersfoort (NL)	(72) Inventors: HEDENSTEDT, Kristoffer S-421 36 Göteborg (SE) EDVINSSON ALBERS, Rolf S-433 31 Partille (SE) (74) Representative: Akzo Nobel IP Department  Velperweg 76 6824 BM Arnhem 6824 BM Arnhem (NL)