(19)

(11)

EP 4 244 261 A1

(12)

(43) Date of publication: 20.09.2023 Bulletin 2023/38 (21) Application number: 21810058.4 (22) Date of filing: 10.11.2021

(51) International Patent Classification (IPC):  C08B 3/16(2006.01) C08L 5/14(2006.01) C08B 37/00(2006.01) C08B 3/10(2006.01) C08B 37/14(2006.01) (52) Cooperative Patent Classification (CPC): C08B 3/16; C08L 1/14; C08L 5/14; C08B 37/0057 (86) International application number: PCT/FI2021/050762 (87) International publication number: WO 2022/101551 (19.05.2022 Gazette 2022/20)

(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: 11.11.2020 FI 20206137 (71) Applicant: UPM-Kymmene Corporation 00100 Helsinki (FI)	(72) Inventors: SAPKOTA, Janak 53900 Lappeenranta (FI) POHJALAINEN, Teemu 53850 Lappeenranta (FI) VIRTANEN, Pasi 54920 Taipalsaari (FI) KOSONEN, Harri 53300 Lappeenranta (FI) MODIG, Sakari 53900 Lappeenranta (FI) RISTOLAINEN, Matti 53900 Lappeenranta (FI) (74) Representative: Papula Oy  P.O. Box 981 00101 Helsinki 00101 Helsinki (FI)