US 12,109,520 B2
Multi-layer, biodegradable composites for air filtration
Zhiqun Zhang, North Oaks, MN (US); Michael R. Berrigan, Oakdale, MN (US); Ignatius A. Kadoma, Cottage Grove, MN (US); Bryan L. Gerhardt, Woodbury, MN (US); Liming Song, Woodbury, MN (US); John D. Stelter, Osceola, WI (US); and Zackary J. Becker, Minneapolis, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/422,560
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Jan. 17, 2020, PCT No. PCT/IB2020/050361
§ 371(c)(1), (2) Date Jul. 13, 2021,
PCT Pub. No. WO2020/152551, PCT Pub. Date Jul. 30, 2020.
Claims priority of provisional application 62/794,900, filed on Jan. 21, 2019.
Prior Publication US 2022/0096977 A1, Mar. 31, 2022
Int. Cl. B01D 46/00 (2022.01); B01D 39/16 (2006.01); B01D 46/10 (2006.01); B01D 46/52 (2006.01); B32B 5/02 (2006.01); B32B 5/08 (2006.01); B32B 5/26 (2006.01); D01F 1/10 (2006.01); D01F 8/14 (2006.01); D04H 1/435 (2012.01); D04H 1/541 (2012.01); D04H 3/011 (2012.01); D04H 3/16 (2006.01); F24F 8/108 (2021.01)
CPC B01D 39/163 (2013.01) [B01D 46/10 (2013.01); B01D 46/521 (2013.01); B32B 5/022 (2013.01); B32B 5/08 (2013.01); B32B 5/267 (2021.05); D01F 1/10 (2013.01); D01F 8/14 (2013.01); D04H 1/5412 (2020.05); D04H 3/011 (2013.01); D04H 3/16 (2013.01); F24F 8/108 (2021.01); B01D 2239/0233 (2013.01); B01D 2239/0266 (2013.01); B01D 2239/0618 (2013.01); B01D 2239/0627 (2013.01); B01D 2239/065 (2013.01); B01D 2239/10 (2013.01); B01D 2239/1291 (2013.01); B32B 2250/02 (2013.01); B32B 2250/20 (2013.01); B32B 2262/0276 (2013.01); B32B 2262/124 (2021.05); B32B 2307/7163 (2013.01); B32B 2307/724 (2013.01); B32B 2307/734 (2013.01); D10B 2331/041 (2013.01); D10B 2401/041 (2013.01); D10B 2401/12 (2013.01); D10B 2505/04 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A multi-layered composite comprising:
a first layer comprising a first nonwoven web, the web including multicomponent fibers; and
a second layer comprising a second nonwoven web adjacent the first layer, wherein the first layer has a Fiber Bundling Index of at least 2.