Patent ID: 8222164
Filing Date: 2012-07-17
Classification: B29C,B32B,D01D,D01F,D04H,D06C,Y10T

Abstract:
1. A moisture vapor permeable, water impermeable composite sheet material having strength and barrier properties making it suitable for use as a housewrap, comprising an area bonded, spunbond nonwoven substrate comprising polymeric filaments randomly disposed and bonded to one another at locations where the randomly disposed filaments overlie or cross one another; a polyolefin film extrusion coating layer extending continuously over a surface of the nonwoven substrate and intimately bonded thereto, the extrusion coating layer defining an outer surface of the composite sheet material, and the film layer having micropores formed therein by stretching to impart to the composite sheet material a hydrostatic head of at least 100 cm, and a moisture vapor transmission rate (MVTR) of at least 35 g/m wherein the nonwoven substrate has a grab tensile strength of at least 178 Newtons in at least one of the machine direction (MD) or the cross-machine direction (CD).