(19)

(11)

EP 3 942 087 A1

(12)

(43) Date of publication: 26.01.2022 Bulletin 2022/04 (21) Application number: 20715960.9 (22) Date of filing: 12.03.2020

(51) International Patent Classification (IPC):  C23C 8/16(2006.01) C22C 38/40(2006.01) C21D 8/02(2006.01) C23C 8/18(2006.01) (52) Cooperative Patent Classification (CPC): C22C 19/07; C22C 38/18; C21D 8/0278; C22C 19/057; C21D 8/0294; C22C 30/00; C23C 8/18; C23C 8/16; C22C 19/05; C22C 38/40 (86) International application number: PCT/IB2020/052252 (87) International publication number: WO 2020/188426 (24.09.2020 Gazette 2020/39)

(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: 20.03.2019 CA 3037315 (71) Applicant: Nova Chemicals (International) S.A. 1700 Fribourg (CH)	(72) Inventors: MAH, Evan Calgary, Alberta T2E 2S7 (CA) REULE, Allen Lethbridge, Alberta T1H 4R1 (CA) STANG, Krista Calgary, Alberta T2Z 0R1 (CA) (74) Representative: Mewburn Ellis LLP  Aurora Building Counterslip Bristol BS1 6BX Bristol BS1 6BX (GB)