Breathable film compositions and articles and method
AssigneePolymer Group, Inc.
InventorsLarry McAmish, Timothy Huskey
Life of this patent
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Abstract
A breathable film is composed of a uniform blend of two thermoplastic resins, one having a high moisture vapor transmission rate and the other having a low rate. The blend is melt extruded into a film having good handling characteristics and a controlled degree of moisture vapor transmission, as determined by blend ratio per unit of film thickness.
Claims4
A breathable film, said film consisting essentially of a blend of high MVTR thermoplastic polymer selected from the group consisting of polyurethanes, polyesters and copolyesters, and a low MVTR thermoplastic ethylene ester copolymer, said film being a monolithic single layer film and having a breathability in proportion to the ratio of the high and low MVTR polymers.
Dependencies are inferred from the claim text.