Process for producing highly porous thermoplastic films
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United States of America Patent
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Sep 21, 1982
Issued Date -
N/A
app pub date -
Jun 25, 1980
filing date -
May 5, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed a novel process for the cold stretching at high stretch tension and at low stretch ratios of a film of a blend of synthetic orientable thermoplastic polymer and at least 50 weight percent of a coated inorganic filler selected from the group consisting of calcium carbonate, clays and titanium oxide and coated with a fatty acid ester of silicon and titanium to form a highly porous thermoplastic film (i.e. 10,000 to 100,000 surface ruptures/mm.sup.2) exhibiting paper-like properties.
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