US 11,939,712 B2
Meltblown nonwoven fabrics, and composites thereof
Aleksandar Stoiljkovic, Waedenswil (CH); Eduardo Alvarez, Tarragona (ES); and Yijian Lin, Pearland, TX (US)
Assigned to Dow Global Technologies, LLC, Midland, MI (US)
Appl. No. 17/595,479
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Jul. 20, 2020, PCT No. PCT/US2020/042763
§ 371(c)(1), (2) Date Nov. 17, 2021,
PCT Pub. No. WO2021/021480, PCT Pub. Date Feb. 4, 2021.
Claims priority of provisional application 62/879,147, filed on Jul. 26, 2019.
Prior Publication US 2022/0251748 A1, Aug. 11, 2022
Int. Cl. D04H 3/018 (2012.01); A61F 13/15 (2006.01); D04H 1/4291 (2012.01); D04H 1/4391 (2012.01); D04H 1/724 (2012.01); D04H 3/03 (2012.01); D04H 3/16 (2006.01)
CPC D04H 3/018 (2013.01) [A61F 13/15577 (2013.01); D04H 1/4291 (2013.01); D04H 1/4391 (2013.01); D04H 1/724 (2013.01); D04H 3/03 (2013.01); D04H 3/16 (2013.01); A61F 2013/15552 (2013.01); A61F 2013/15959 (2013.01); A61F 2013/15967 (2013.01); D10B 2509/02 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A meltblown nonwoven formed from a bicomponent fiber, wherein:
the bicomponent fiber has a first region and a second region,
the first region is formed from a first composition comprising at least 75 wt. % of a polypropylene;
the second region is formed from a second composition comprising at least 75 wt. % of an ethylene/alpha-olefin interpolymer having
a density of from 0.911 to 0.950 g/cc,
a Brookfield viscosity at 177° C. from 5,000 cP to 40,000 cP, and
a molecular weight distribution (Mw,cc/Mn,cc) of 1.8 to 3.5,
a highest DSC temperature crystallization peak, Tc, from 80° C. to 110° C.;
the ethylene/α-olefin interpolymer has a temperature differential between a highest DSC temperature melting peak (Tm) and a highest DSC temperature crystallization peak (Tc), (ΔTm-Tc), of less than 16° C.; and
the bicomponent fiber has a shear viscosity ratio of the first composition to the second composition of less than 2.0.