Patent ID: 6187696
Filing Date: 2001-02-13
Classification: B32B,Y10T

Abstract:
A moisture vapor permeable, substantially liquid impermeable composite sheet material comprising:a fibrous nonwoven substrate, said substrate having opposite first and second planar sides;a moisture vapor permeable thermoplastic film bonded to the first side of said fibrous substrate, said moisture vapor permeable film having an average thickness of less than 15 microns and being comprised of at least about 50% by weight of polymer selected from the group consisting of block copolyether esters, block copolyether amides, polyurethanes, polyvinyl alcohol, and combinations thereof;said composite sheet exhibiting a peel strength of at least 0.1 N/cm, a dynamic fluid transmission of less than about 0.65 g/m.sup.2 when subjected to an impact energy of about 2400 joules/m.sup.2, a hydrostatic head of at least 120 cm, and having a moisture vapor transmission rate, according to the desiccant method, of at least 3200 g/m.sup.2 /24 hr.