Breathable microporous film and methods for making it
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United States of America Patent
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-
Apr 30, 1991
Issued Date -
N/A
app pub date -
Nov 5, 1990
filing date -
Jul 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A soft, flexible, microporous film is provided having high tensile strength and good air and water vapor transmission rates therethrough while being substantially impenetrable to liquid water. This film is prepared by stretching a casting of a composition of a polyolefin and high levels of CaCO.sub.3 or glass beads and calcium stearate in two directions from 1.5-7 times in each direction to produce a film having a Gurley porosity of from 0.1 to 85 seconds. This film is especially useful for disposable items such as feminine panty liners, diapers, bed sheets, and hospital gowns. When glass beads are substituted for the CaCO.sub.3, the film is useful for battery separators.
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