(19)

(11)

EP 3 867 434 A1

(12)

(43) Date of publication: 25.08.2021 Bulletin 2021/34 (21) Application number: 19872860.2 (22) Date of filing: 07.10.2019

(51) International Patent Classification (IPC):  D04H 1/00(2006.01) D04H 1/56(2006.01) D04H 1/43(2012.01) D04H 1/4291(2012.01) (86) International application number: PCT/IB2019/058525 (87) International publication number: WO 2020/079525 (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 US 201862746386 P 28.11.2018 US 201862772277 P (71) Applicant: 3M Innovative Properties Company Saint Paul, Minnesota 55133-3427 (US)	(72) Inventors: WU, Tien T. Saint Paul, Minnesota 55133-3427 (US) WU, Pingfan Saint Paul, Minnesota 55133-3427 (US) REN, Liyun Saint Paul, Minnesota 55133-3427 (US) (74) Representative: Mathys & Squire  Theatinerstraße 7 80333 München 80333 München (DE)