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AssigneeClopay Plastic Products Company, Inc.
InventorsGregory K. Jones, Larry Hughey McAmish, Pai-Chuan Wu, Kenneth L. Lilly, Christopher Aaron Shelley, Mark Andrew Wendorf
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Embodiments of a breathable multilayer microporous film comprise a first outer film layer, a second inner film layer, and a third outer film layer, wherein each film layer comprises at least one pore-forming filler and one thermoplastic polymer. Each film layer is rendered microporous and breathable by stretching each film layer having the pore-forming filler therein, wherein the first and third outer film layers have first and third maximum pore sizes, respectively, and the second inner film layer has a second maximum pore size different than the respective maximum pore sizes of the first and third outer film layers of the multilayer film. The multilayer microporous film passes ASTM F 1671-03 test.
A breathable multilayer microporous film, comprising a first outer film layer, a second inner film layer, and a third outer film layer, wherein each film layer comprises at least one pore-forming filler and one thermoplastic polymer, with each layer rendered microporous and breathable by stretching each film layer having the pore-forming filler therein, wherein the first and third outer film layers have first and third maximum pore sizes, respectively, and the second inner film layer has a second maximum pore size smaller than the respective maximum pore sizes of the first and third outer film layers of the multilayer film, wherein the maximum pore size of the multilayer microporous film is from about 0.10 to about 0.13 microns, and wherein the multilayer microporous film passes ASTM F 1671-03 test.
Dependencies are inferred from the claim text.