Temperature-sensitive microporous film
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United States of America Patent
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Nov 30, 1999
Grant Date -
N/A
app pub date -
Apr 29, 1997
filing date -
Apr 29, 1997
priority date (Note) -
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Abstract
A single or multi-layer microporous material of which at least one layer contains a compatible, melt-processible polymer mixture having a first polymer component with a melting point greater than 140.degree. C. and a second polymer component having a melting point lower than 120.degree. C. is described as well as a method of preparing the material. The first polymer component and the second polymer component are miscible in a compound or compatible liquid when heated above the melting temperature of the first polymer component or above the liquid--liquid phase separation temperature and phase separate from the compound or compatible liquid when cooled. The materials are particularly useful as battery separators.
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