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(11)

EP 2 737 091 A1

(12)

(43) Date of publication: 04.06.2014 Bulletin 2014/23 (21) Application number: 12750856.2 (22) Date of filing: 26.07.2012

(51) International Patent Classification (IPC):  C21B 3/06(2006.01) C04B 5/06(2006.01) C22B 7/04(2006.01) C01B 25/02(2006.01) C04B 18/14(2006.01) (86) International application number: PCT/NL2012/050536 (87) International publication number: WO 2013/015690 (31.01.2013 Gazette 2013/05)

(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: 28.07.2011 NL 2007190 (71) Applicant: Etna B.V. 6136 KN Sittard (NL)	(72) Inventors: WIEGERS, Robert Benno NL-6063 NG Vlodrop (NL) SIJBERS, Maria Geertruida Johanna NL-6081 GK Haelen (NL) SMEETS, Gerardus Elisabeth Maria Regina Michaël DE-52538 Schalbruch-Selftant (DE) (74) Representative: Nederlandsch Octrooibureau  P.O. Box 29720 2502 LS The Hague 2502 LS The Hague (NL)