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(11)

EP 4 816 460 A1

(12)

(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 24820843.1 (22) Date of filing: 26.11.2024

(51) International Patent Classification (IPC):  C08K 5/134(2006.01) C08L 23/08(2025.01) C08K 5/1535(2006.01) (52) Cooperative Patent Classification (CPC): C08F 4/65908; C08F 4/65912; C08K 5/005; C08F 2420/04; C08F 210/16   C-Sets: C08K 5/1535, C08L 23/0815; C08K 5/134, C08L 23/0815; C08F 210/16, C08F 210/14, C08F 2500/02, C08F 2500/03, C08F 2500/06, C08F 2500/10, C08F 2500/11, C08F 2500/12, C08F 2500/13, C08F 2500/17, C08F 2500/27, C08F 2500/28, C08F 2500/29, C08F 2500/30, C08F 2500/31, C08F 2500/37; C08F 210/16, C08F 2/001; C08F 210/16, C08F 4/6592; C08F 210/16, C08F 210/14, C08F 2500/03, C08F 2500/10, C08F 2500/12; C08F 210/16, C08F 210/14, C08F 2500/02, C08F 2500/03, C08F 2500/10, C08F 2500/12; (86) International application number: PCT/IB2024/061862 (87) International publication number: WO 2025/114887 (05.06.2025 Gazette 2025/23)

(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: GE KH MA MD TN (30) Priority: 01.12.2023 US 202363605172 P (71) Applicant: Nova Chemicals (International) S.A. 1700 Fribourg (CH)	(72) Inventors: WASYLENKO, Derek Calgary, Alberta T2E 7K7 (CA) BELLEHUMEUR, Celine Calgary, Alberta T2E 7K7 (CA) TIKUISIS, Tony Calgary, Alberta T1Y 6G7 (CA) TAYLOR, Jared Calgary, Alberta T2E 7K7 (CA) D'AGOSTINO, Carmine Calgary, Alberta T1Y 6G7 (CA) (74) Representative: Mewburn Ellis LLP  Aurora Building Counterslip Bristol BS1 6BX Bristol BS1 6BX (GB)