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EP 4 577 501 A1

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(43) Date of publication: 02.07.2025 Bulletin 2025/27 (21) Application number: 23767810.7 (22) Date of filing: 29.08.2023

(51) International Patent Classification (IPC):  C02F 1/00(2023.01) C02F 103/10(2006.01) C02F 103/32(2006.01) C02F 1/76(2023.01) C02F 1/72(2023.01) C02F 103/28(2006.01) C02F 103/36(2006.01) (52) Cooperative Patent Classification (CPC): C02F 1/008; C02F 2209/04; C02F 2209/02; C02F 2209/06; C02F 2103/28; C02F 2103/10; C02F 2103/365; C02F 2103/32; C02F 1/76; C02F 2303/04; C02F 1/72 (86) International application number: PCT/EP2023/073723 (87) International publication number: WO 2024/047067 (07.03.2024 Gazette 2024/10)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 30.08.2022 GB 202212533 28.02.2023 FI 20235242 (71) Applicant: Kemira OYJ Helsinki 00180 (FI)	(72) Inventors: EKMAN, Jaakko 02271 Espoo (FI) HESAMPOUR, Mehrdad 02271 Espoo (FI) KRAPU, Sari 02271 Espoo (FI) TIKKALA, Vesa-Matti 02271 Espoo (FI) JOENSUU, Iiris 02271 Espoo (FI) PIIRONEN, Marjatta 02271 Espoo (FI) (74) Representative: Page White Farrer  Bedford House 21a John Street London WC1N 2BF London WC1N 2BF (GB)