(19)

(11)

EP 2 376 381 A2

(12)

(88) Date of publication A3: 16.09.2010 (43) Date of publication: 19.10.2011 Bulletin 2011/42 (21) Application number: 09837789.8 (22) Date of filing: 01.12.2009

(51) International Patent Classification (IPC):  C01B 33/158(2006.01) (86) International application number: PCT/US2009/066229 (87) International publication number: WO 2010/080237 (15.07.2010 Gazette 2010/28)

(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 SM TR (30) Priority: 18.12.2008 US 138562 P (71) Applicant: 3M Innovative Properties Company Saint Paul, MN 55133-3427 (US)	(72) Inventors: SHARMA, Neeraj Saint Paul, MN 55133-3427 (US) SETH, Jayshree Saint Paul, MN 55133-3427 (US) TAN, Lian, Soon Saint Paul, MN 55133-3427 (US) CONDO, Peter, D. Saint Paul, MN 55133-3427 (US) WU, Jung-Sheng Saint Paul, MN 55133-3427 (US) FEISEL, Bryan, C. Saint Paul, MN 55133-3427 (US) (74) Representative: Vossius & Partner  Siebertstrasse 4 81675 München 81675 München (DE)