(19)

(11)

EP 4 305 235 A1

(12)

(43) Date of publication: 17.01.2024 Bulletin 2024/03 (21) Application number: 22711223.2 (22) Date of filing: 08.03.2022

(51) International Patent Classification (IPC):  D21C 3/00(2006.01) D21C 7/14(2006.01) D21C 1/02(2006.01) D21C 3/02(2006.01) D21C 9/02(2006.01) D21C 7/00(2006.01) D21C 9/10(2006.01) C08J 5/04(2006.01) D21C 5/00(2006.01) D21C 9/16(2006.01) (52) Cooperative Patent Classification (CPC): D21C 1/02; D21C 3/02; D21C 5/005; D21C 9/02; D21C 9/10; D21C 9/163; D21C 3/00; D21C 7/00; D21C 7/14 (86) International application number: PCT/EP2022/055842 (87) International publication number: WO 2022/189408 (15.09.2022 Gazette 2022/37)

(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: 08.03.2021 GB 202103186 08.03.2021 GB 202103187 (71) Applicant: Trifilon AB 611 39 Nyköping (SE)	(72) Inventor: LIDSTRAND, Martin 611 39 Nyköping (SE) (74) Representative: J A Kemp LLP  80 Turnmill Street London EC1M 5QU London EC1M 5QU (GB)