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(11)

EP 2 268 782 A2

(12)

(88) Date of publication A3: 14.01.2010 (43) Date of publication: 05.01.2011 Bulletin 2011/01 (21) Application number: 09731207.8 (22) Date of filing: 13.04.2009

(51) International Patent Classification (IPC):  C11D 3/22(2006.01) C11D 3/50(2006.01) C11D 3/38(2006.01) C11D 3/12(2006.01) C11D 3/37(2006.01) C11D 17/00(2006.01) B01J 13/22(2006.01) (86) International application number: PCT/US2009/040376 (87) International publication number: WO 2009/126960 (15.10.2009 Gazette 2009/42)

(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 MK MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA RS (30) Priority: 03.03.2009 US 397043 30.09.2008 US 101336 11.04.2008 US 44381 11.04.2008 US 44384 03.12.2008 US 327570 (71) Applicant: AMCOL INTERNATIONAL CORPORATION Hoffman Estates, IL 60192 (US)	(72) Inventors: SENGUPTA, Tapashi Barrington IL 60010 (US) SENGUPTA, Ashoke, K. Barrington IL 60010 (US) (74) Representative: Albrecht, Thomas  Kraus & Weisert Patent- und Rechtsanwälte Thomas-Wimmer-Ring 15 80539 München 80539 München (DE)