(19)

(11)

EP 3 720 816 A1

(12)

(43) Date of publication: 14.10.2020 Bulletin 2020/42 (21) Application number: 18819452.6 (22) Date of filing: 05.12.2018

(51) International Patent Classification (IPC):  C01F 5/00(2006.01) C09C 1/36(2006.01) D21H 17/13(2006.01) C09D 1/02(2006.01) C01F 7/00(2006.01) (86) International application number: PCT/FI2018/050879 (87) International publication number: WO 2019/110871 (13.06.2019 Gazette 2019/24)

(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 Designated Validation States: KH MA MD TN (30) Priority: 05.12.2017 FI 20176092 (71) Applicant: Keusik Oy 90460 Oulunsalo (FI)	(72) Inventors: SAASTAMOINEN, Sakari FI-13210 Hämeenlinna (FI) SAASTAMOINEN, Sirpa FI-13210 Hämeenlinna (FI) (74) Representative: Berggren Oy, Helsinki & Oulu  P.O. Box 16 Eteläinen Rautatiekatu 10A 00101 Helsinki 00101 Helsinki (FI)