Process of making porous films or sheets
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United States of America Patent
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-
Nov 4, 1997
Grant Date -
N/A
app pub date -
Oct 6, 1995
filing date -
Dec 21, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A porous film or sheet including a resin composition mainly of an ultra-high molecular weight polyethylene having a viscosity-average molecular weight of not less than 500,000, and having a thickness of 10 to 100 .mu.m, an air permeability of 20 to 2,000 sec/100 cc, a porosity of 15 to 80%, a pin puncture strength (per 25 .mu.m of film thickness) of not less than 120 g, a thermal-shut down temperature of 90.degree. to 150.degree. C. and a heat puncture temperature of not less than 160.degree. C., and a process for producing the same.
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