Breathable extruded polymer films

Details Breathable extruded polymer films Breathable extruded polymer films

1998-01-26

2000-08-22

Dawson, Robert

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

524425, 524451, 524445, 524449, 524450, 524432, 524423, 524448, 524492, 524437, 524497, 524 35, 524 3, 524586, 524584, B32B 2732

Patent

active

061069566

ABSTRACT:
A polymer film comprising at least first and second contiguous and coextruded portions, wherein the first portion is extruded from a first polymer composition containing a filler material in an amount sufficient to increase the water vapor permeability of the first portion relative to the second portion, and the second portion is extruded from a second polymer composition such that a tensile strength of the second portion is greater than the tensile strength of the first portion. Such polymer films allow for highly vapor permeability, while providing portions with sufficient strength to allow for taping or attachment of fastening devices.

REFERENCES:
patent: 3840418 (1974-10-01), Sabee
patent: 4076698 (1978-02-01), Anderson et al.
patent: 4153664 (1979-05-01), Sabee
patent: 4223059 (1980-09-01), Schwarz
patent: 4350655 (1982-09-01), Hoge
patent: 4435141 (1984-03-01), Weisner et al.
patent: 4472328 (1984-09-01), Sugimoto et al.
patent: 4734324 (1988-03-01), Hill
patent: 4777073 (1988-10-01), Sheth
patent: 5032450 (1991-07-01), Rechlicz et al.

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