(19)

(11)

EP 3 864 201 A1

(12)

(43) Date of publication: 18.08.2021 Bulletin 2021/33 (21) Application number: 19871079.0 (22) Date of filing: 08.10.2019

(51) International Patent Classification (IPC):  D01F 6/30(2006.01) E01C 13/08(2006.01) D01F 6/46(2006.01) (86) International application number: PCT/US2019/055114 (87) International publication number: WO 2020/076767 (16.04.2020 Gazette 2020/16)

(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: 08.10.2018 US 201862742539 P 19.07.2019 US 201916517231 (71) Applicant: Westlake Compounds LLC Houston, TX 77056 (US)	(72) Inventor: STOFFER, Eric Houston, Texas 77056 (US) (74) Representative: Murgitroyd & Company  Murgitroyd House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)