Multilayer breathable film
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United States of America Patent
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Aug 16, 2005
Issued Date -
N/A
app pub date -
Aug 16, 1999
filing date -
Jul 31, 1996
priority date (Note) -
Expired
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Abstract
The present invention comprises a stretched, multilayer breathable film that provides a barrier to microorganisms, blood and bodily fluids that is manufactured by simultaneously extruding a five-layer film having a minimum structure of C:A:B:A:C or a three-layer film having a minimum structure of C:D:C in which B is a microporous core layer, C is an outer monolithic layer, A is a microporous adhesive layer for bonding the outer monolithic layers to the core layer, and D is a microporous adhesive layer, and then stretching the extruded film to form micropores in the microporous core layer or the microporous adhesive layer, the micropores allowing the passage of water vapor but substantially preventing the passage of liquid water.
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