(19)

(11)

EP 3 906 331 A1

(12)

(43) Date of publication: 10.11.2021 Bulletin 2021/45 (21) Application number: 19836776.5 (22) Date of filing: 19.12.2019

(51) International Patent Classification (IPC):  D01F 1/10(2006.01) D01F 1/04(2006.01) E01C 13/08(2006.01) (52) Cooperative Patent Classification (CPC): E01C 13/08; D06N 7/0065; D01F 1/04; D01F 1/10; D01F 6/04 (86) International application number: PCT/US2019/067362 (87) International publication number: WO 2020/142230 (09.07.2020 Gazette 2020/28)

(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: 03.01.2019 EP 19382003 (71) Applicant: Dow Global Technologies LLC Midland, MI 48674 (US)	(72) Inventors: ALVAREZ, Eduardo 43006 Tarragona (ES) LOPEZ, David 43006 Tarragona (ES) SANDKUEHLER, Peter Hermann Roland 8810 Horgen (CH) (74) Representative: Boult Wade Tennant LLP  Salisbury Square House 8 Salisbury Square London EC4Y 8AP London EC4Y 8AP (GB)