Process for making a heterogeneous membrane film
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United States of America Patent
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Mar 20, 1990
Issued Date -
N/A
app pub date -
Oct 19, 1988
filing date -
Mar 25, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A film having a porous core layer and nonporous outer layers is made from a composition of certain polymers, particularly ethylene polymers, a particulate filler which has little affinity for the polymer, and optionally an organic compound which decreases the tendency for affinity of the particulate for the polymer. The film is produced by extruding the composition through a die gap of at least 250 .mu.m, and subsequently stretching the film after cooling to a temperature below the melting temperature of the polymer.
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