METHODS OF MAKING MICROPOROUS POLYMERIC MEMBRANES AND THE USE OF SUCH MEMBRANES AS BATTERY SEPARATOR FILM
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United States of America Patent
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Issued Date -
Oct 23, 2014
app pub date -
May 12, 2014
filing date -
Sep 2, 2008
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Abandoned
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Abstract
A method of producing a microporous membrane includes combining at least a first polyethylene and a first diluent; combining at least a second polyethylene and a second diluent; combining at least a third polyethylene and a third diluent; forming from the combined polyethylenes and diluents a multi-layer extrudate having a first layer containing the first polyethylene, a second layer containing the second polyethylene, and a third layer located between the first and second layers containing the third polyethylene, wherein the extrudate contains polyethylene having a terminal unsaturation ≧0.20 per 10,000 carbon atoms in an amount of 4.0 wt. % to 35.0 wt. %; and removing at least a portion of the first, second, and third diluents from the multi-layer extrudate to produce the membrane.
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