Vinylidene fluoride porous membrane and method of preparing the same
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United States of America Patent
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May 7, 1996
Grant Date -
N/A
app pub date -
Oct 5, 1994
filing date -
Oct 5, 1993
priority date (Note) -
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Abstract
A polyvinylidene fluoride porous membrane has an asymmetrical structure, excellent mechanical strength such as tensile strength at break and elongation at break, and a desirable narrow range of pore diameter distribution. A method of preparing the porous membrane is also disclosed. The membrane comprises a vinylidene fluoride resin having an inherent viscosity from 1.3 to 15.0 (dl/g), and the membrane comprises pores which satisfy the following numerical expression (A): 4.0
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