(19)

(11)

EP 3 947 809 A1

(12)

(43) Date of publication: 09.02.2022 Bulletin 2022/06 (21) Application number: 20783207.2 (22) Date of filing: 31.03.2020

(51) International Patent Classification (IPC):  D21C 1/02(2006.01) C08H 8/00(2010.01) C08B 37/14(2006.01) (52) Cooperative Patent Classification (CPC): D21C 11/0007; C08B 37/0057; C08H 8/00; D21C 1/02 (86) International application number: PCT/SE2020/050331 (87) International publication number: WO 2020/204793 (08.10.2020 Gazette 2020/41)

(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: 01.04.2019 SE 1950402 (71) Applicant: VALMET AB 851 94 Sundsvall (SE)	(72) Inventor: WAUTS, Johann 1201 Sonheuwel (ZA)