High crystalline polypropylene microporous membrane, multi-component microporous membrane and methods for preparing the same
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United States of America Patent
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Dec 14, 2004
Grant Date -
Feb 13, 2003
app pub date -
Sep 7, 2001
filing date -
Jan 10, 2000
priority date (Note) -
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Abstract
The present invention relates to a high crystalline polypropylene microporous membrane and a preparation method of the same, and it provides a preparation method of a polypropylene microporous membrane comprising the steps of preparing a precursor film using high crystalline polypropylene having a crystallinity of 50% or more and a very high isotacticity, annealing, stretching at a low temperature, stretching at a high temperature, and heat setting, and a polypropylene microporous membrane having superior permeability and mechanical properties prepared by the preparation method.
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