Microporous materials and methods of making the same
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United States of America Patent
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Oct 14, 2003
Grant Date -
Feb 20, 2003
app pub date -
Apr 4, 2001
filing date -
Apr 4, 2001
priority date (Note) -
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Abstract
Microporous materials and articles are disclosed. The microporous materials contain a crystallizable propylene-containing polymer, a beta-nucleating agent, and a diluent that is miscible with the polymer at a temperature above the melting temperature of the polymer and that phase separates from the polymer at a temperature below the polymer crystallization temperature. The invention is also directed to methods of forming the microporous material using thermal induced phase separation and subsequent processing.
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