Patent ID: 6410465
Filing Date: 2002-06-25
Classification: B32B,D04H,Y10T

Abstract:
A moisture vapor permeable, substantially liquid impermeable composite sheet material comprising:a first fibrous nonwoven web having a first side and an opposite second side, a second fibrous nonwoven web having a first side and an opposite second side, the first side of said second fibrous nonwoven web abutting the second side of said first fibrous nonwoven web, said first and second fibrous nonwoven webs each being powder-bonded webs wherein the fibers of said first and second fibrous webs are bonded to the other fibers of such respective webs by a synthetic adhesive permeating said first and second nonwoven fibrous webs, and wherein the first and second fibrous nonwoven webs are bonded to each other by said adhesive, a moisture vapor permeable thermoplastic film bonded to the second side of said second fibrous nonwoven web; wherein at least 90 weight percent of the fibers in said first fibrous nonwoven web are compatible with said adhesive, between 25 and 75 weight percent of the fibers in said second fibrous nonwoven web are compatible with said adhesive and said thermoplastic film, between 75 and 25 weight percent of the fibers in said second fibrous nonwoven web are incompatible with said adhesive and said thermoplastic film, and at least 50 weight percent of the polymer in said thermoplastic film is compatible with said adhesive.