US 9,809,004 B2
Breathable protective apparel
Stephane Nowak, Thionville (FR); and Serge Rebouillat, Echenevex (FR)
Assigned to E I DU PONT DE NEMOURS AND COMPANY, Wilmington, DE (US)
Filed by E I DU PONT DE NEMOURS AND COMPANY, Wilmington, DE (US)
Filed on Jul. 13, 2015, as Appl. No. 14/797,530.
Claims priority of provisional application 62/026,115, filed on Jul. 18, 2014.
Prior Publication US 2016/0016385 A1, Jan. 21, 2016
Int. Cl. B32B 27/20 (2006.01); B32B 27/12 (2006.01); B32B 7/14 (2006.01); B32B 5/02 (2006.01); B32B 7/04 (2006.01); B32B 27/32 (2006.01)
CPC B32B 7/14 (2013.01) [B32B 5/022 (2013.01); B32B 7/045 (2013.01); B32B 27/12 (2013.01); B32B 27/20 (2013.01); B32B 27/32 (2013.01); B32B 2262/0253 (2013.01); B32B 2262/106 (2013.01); B32B 2264/108 (2013.01); B32B 2305/026 (2013.01); B32B 2307/54 (2013.01); B32B 2307/718 (2013.01); B32B 2307/724 (2013.01); B32B 2307/7265 (2013.01); B32B 2437/00 (2013.01); B32B 2439/00 (2013.01); B32B 2571/00 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A laminated structure consisting of a microporous film bonded in a face to face relationship with a plexifilamentary nonwoven web with an adhesive layer situated in contact with a least a portion of both the microporous film and the nonwoven web, wherein;
the film contains filler consisting of calcium carbonate, clay, titanium dioxide, barium sulfate or any combination thereof in an amount between 30% and 50% by weight of the total film weight, and between 40% and 90% of polyolefin polymer by weight of the total film weight,
the film has a thickness of between 12 and 25 microns,
the film is bonded to the plexifilamentary web by adhesive,
the laminated structure has a water vapor transmission rate (WVTR) as measured by the EN ISO 12572 Climate C method of greater than or equal to 1000 g/m2/day,
the basis weight of the laminated structure is at least 55 g/m2,
the tensile strength of the laminated structure according to EN ISO 13934-1 is at least 35 Newtons in the machine direction,
the tensile elongation of the laminated structure according to EN ISO 13934-1 is at least 8% in the machine direction,
the tensile strength of the laminated structure according to EN ISO 13934-1 is at least 35 Newtons in the cross direction,
the tensile elongation according to EN ISO 13934-1 is at least 15% in the cross direction, and
the laminated structure has a hydrohead according to EN 20811 of at least 200 cm of water.