(19)

(11)

EP 3 752 467 A1

(12)

(43) Date of publication: 23.12.2020 Bulletin 2020/52 (21) Application number: 19709542.5 (22) Date of filing: 11.02.2019

(51) International Patent Classification (IPC):  C02F 1/66(2006.01) C02F 11/127(2019.01) C02F 1/00(2006.01) C02F 1/38(2006.01) C02F 103/28(2006.01) C02F 11/122(2019.01) B01F 7/00(2006.01) C02F 1/02(2006.01) C02F 1/52(2006.01) (86) International application number: PCT/FI2019/050100 (87) International publication number: WO 2019/158813 (22.08.2019 Gazette 2019/34)

(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: 16.02.2018 FI 20185144 (71) Applicant: UPM-Kymmene Corporation 00100 Helsinki (FI)	(72) Inventors: SAHLBERG, Teppo 53500 Lappeenranta (FI) VIRTANEN, Pasi 54920 Taipalsaari (FI) HÄKKINEN, Kaisa 55420 Imatra (FI) MIETTINEN, Mauno 53600 Lappeenranta (FI) (74) Representative: Papula Oy  P.O. Box 981 00101 Helsinki 00101 Helsinki (FI)