US 12,420,537 B2
Breathable cleanroom barrier fabric
Douglas Benton, Northampton, MA (US); and Vamsi Krishna Jasti, Vernon, CT (US)
Assigned to AHLSTROM OYJ, Helsinki (FI)
Filed by Ahlstrom Oyj, Helsinki (FI)
Filed on Dec. 5, 2022, as Appl. No. 18/074,977.
Application 18/074,977 is a continuation of application No. 16/480,007, granted, now 11,518,152, previously published as PCT/EP2018/051528, filed on Jan. 23, 2018.
Claims priority of provisional application 62/449,446, filed on Jan. 23, 2017.
Prior Publication US 2023/0109603 A1, Apr. 6, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 27/12 (2006.01); B32B 5/02 (2006.01); B32B 7/12 (2006.01); B32B 27/28 (2006.01); B32B 27/36 (2006.01); B32B 27/40 (2006.01); B32B 37/12 (2006.01)
CPC B32B 27/12 (2013.01) [B32B 5/022 (2013.01); B32B 7/12 (2013.01); B32B 27/285 (2013.01); B32B 27/36 (2013.01); B32B 27/40 (2013.01); B32B 37/12 (2013.01); B32B 2250/03 (2013.01); B32B 2250/40 (2013.01); B32B 2262/0253 (2013.01); B32B 2262/0284 (2013.01); B32B 2262/12 (2013.01); B32B 2307/718 (2013.01); B32B 2307/724 (2013.01); B32B 2437/00 (2013.01); B32B 2571/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A breathable barrier fabric comprising:
a first outer spunbond layer comprising thermoplastic bicomponent fibers;
an inner monolithic film layer made from a breathable polymer; and
a second outer spunbond layer comprising thermoplastic bicomponent fibers;
the first outer spunbond layer and the second outer spunbond layer each having an inner surface bonded to a surface of the film layer and an outer glazed surface where the thermoplastic bicomponent fibers are at least partially flattened;
the breathable barrier fabric providing barrier properties for protection from viral and bacterial blood-borne pathogens as determined by ATSM F1671 and ISO 16604 test methods,
wherein the inner monolithic comprises a core monolithic sublayer in contact with two outer sublayers wherein the inner sublayer has a lower amount of crystalline segments than the outer sublayers.