(19)

(11)

EP 3 994 299 A1

(12)

(43) Date of publication: 11.05.2022 Bulletin 2022/19 (21) Application number: 20743924.1 (22) Date of filing: 01.07.2020

(51) International Patent Classification (IPC):  D01F 6/70(2006.01) D03D 15/00(2021.01) D01F 8/16(2006.01) D04B 1/18(2006.01) (52) Cooperative Patent Classification (CPC): D01F 8/16; D01F 6/70 (86) International application number: PCT/US2020/040447 (87) International publication number: WO 2021/003236 (07.01.2021 Gazette 2021/01)

(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: 03.07.2019 US 201962870356 P (71) Applicant: Lubrizol Advanced Materials, Inc. Cleveland, OH 44141-3247 (US)	(72) Inventors: SURAGANI VENU, Lalith B. Cleveland, Ohio 44141-3247 (US) VONTORCIK, JR., Joseph J. Cleveland, Ohio 44141-3247 (US) (74) Representative: Bradley, Josephine Mary et al Kilburn & Strode LLP Lacon London 84 Theobalds Road London WC1X 8NL London WC1X 8NL (GB)