Stretched-filled microporous films and methods of making the sam

Details Stretched-filled microporous films and methods of making the sam Stretched-filled microporous films and methods of making the sam

1998-03-10

2000-12-05

Morris, Terrel

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283179, 4283159, B32B 300, B32B 326

Patent

active

061564214

ABSTRACT:
A breathable microporous film is prepared by extruding a film comprising about 30 to 70% by weight of a thermoplastic polymer, about 30 to 70% by weight of filler particles having an average particle size less than about 10 microns and about 100 to 1000 PPM of a mono-functional hindered phenol, such as .alpha.-tocopherol, and then sufficiently stretching the filled film in at least one direction thereby creating a fine pore network therein and a water vapor transmission rate in excess of 300 g/m.sup.2 /24 hours.

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