Patent ID: 6703115
Filing Date: 2004-03-09
Classification: B32B,Y10S,Y10T

Abstract:
A multilayer film comprising:(a) a first layer comprising from about 70 to 100 weight percent of at least one or more thermoplastic polymer(s) having a MVTR value of at least 300 g-&mgr;m/m2-hour or g-mil/m2-day, as determined in accordance with ASTM Test Method E-96D, and from 0 to about 30 weight percent filler, and (b) a second layer comprising from about 20 to about 80 weight percent of at least one or more thermoplastic polymer(s) and from about 20 to about 80 weight percent filler, the second layer having in stretched form a MVTR value, according to ASTM E-96D, greater than the MVTR value, according to ASTM E-96D, of the at least one or more thermoplastic polymer(s) of the second layer; wherein the second layer comprises an amount of filler differing from the amount of filler in the first layer when the at least one or more thermoplastic polymer(s) of the first layer and the at least one or more thermoplastic polymer(s) of the second layer are the same, wherein the first layer is adjacent to the second layer, and wherein the multilayer film, in stretched form, has a MVTR value, according to ASTM E-96D, greater than the MVTR value, according to ASTM E-96D, of the at least one or more thermoplastic polymer(s) of the first layer.