http://www.w3.org/ns/prov#value | - Microporous materials of the invention are prepared by casting a shaped article such as a sheet or layer of a melt-blend solution comprising a crystallizable polymer and a blending compound and, depending on the particular polymer, cooling the article in a quench bath at an appropriate temperature preferably between about 60??? C. and 225??? C. below the equilibrium melting point of the pure cryst
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