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(11)

EP 3 867 318 A1

(12)

(43) Date of publication: 25.08.2021 Bulletin 2021/34 (21) Application number: 19784086.1 (22) Date of filing: 15.10.2019

(51) International Patent Classification (IPC):  C09D 1/00(2006.01) C09D 5/00(2006.01) G02B 1/10(2015.01) G02B 1/111(2015.01) C09D 7/40(2018.01) C03C 17/00(2006.01) C09D 5/16(2006.01) G02B 1/11(2015.01) H01L 31/0216(2014.01) (86) International application number: PCT/EP2019/077918 (87) International publication number: WO 2020/078977 (23.04.2020 Gazette 2020/17)

(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: 16.10.2018 EP 18200804 07.03.2019 EP 19161387 (71) Applicant: Covestro (Netherlands) B.V. 3434EW Nieuwegein (NL)	(72) Inventors: CARCOUET, Camille, Charline, Marie-Cécile 6100 AA Echt (NL) DI SILVESTRE, Silvana Rensina Antonnietta 6100 AA ECHT (NL) (74) Representative: Levpat  c/o Covestro AG Gebäude K12 51365 Leverkusen 51365 Leverkusen (DE)