(19)

(11)

EP 2 931 674 A1

(12)

(43) Date of publication: 21.10.2015 Bulletin 2015/43 (21) Application number: 13863554.5 (22) Date of filing: 12.12.2013

(51) International Patent Classification (IPC):  C04B 2/04(2006.01) C01F 11/02(2006.01) B02C 23/18(2006.01) C04B 2/08(2006.01) B02C 13/00(2006.01) (86) International application number: PCT/FI2013/051160 (87) International publication number: WO 2014/091081 (19.06.2014 Gazette 2014/25)

(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 Designated Extension States: BA ME (30) Priority: 12.12.2012 FI 20126295 (71) Applicant: Kautar Oy 37630 Valkeakoski (FI)	(72) Inventor: VIRTANEN, Pentti FI-37630 Valkeakoski (FI) (74) Representative: Seppo Laine Oy  Itämerenkatu 3 B 00180 Helsinki 00180 Helsinki (FI)