(19)

(11)

EP 2 379 689 A1

(12)

(43) Date of publication: 26.10.2011 Bulletin 2011/43 (21) Application number: 08879278.3 (22) Date of filing: 29.12.2008

(51) International Patent Classification (IPC):  C11D 1/74(2006.01) (86) International application number: PCT/IB2008/055571 (87) International publication number: WO 2010/076595 (08.07.2010 Gazette 2010/27)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR (71) Applicant: Ecolab INC. St. Paul, MN 55102 (US)	(72) Inventors: NAGEL, Chris 40227 Dusseldorf (DE) DURRSCHMIDT, Thomas 40724 Hilden (DE) MERZ, Thomas 40723 Hilden (DE) (74) Representative: Michalski, Stefan  Michalski Hüttermann & Partner Patentanwälte Neuer Zollhof 2 40221 Düsseldorf 40221 Düsseldorf (DE)