Porous membrane and multilayer porous membrane
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United States of America Patent
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Mar 6, 2018
Grant Date -
Jul 6, 2017
app pub date -
Mar 17, 2017
filing date -
Mar 28, 2012
priority date (Note) -
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Abstract
A multilayer porous membrane comprising a porous membrane containing a polyolefin resin as a main component; and a porous layer containing an inorganic filler and a resin binder and laminated on at least one surface of the porous membrane; wherein the porous membrane has an average pore size d=0.035 to 0.060 μm, a tortuosity τa=1.1 to 1.7, and the number B of pores=100 to 500 pores/μm2, which are calculated by a gas-liquid method, and the porous membrane has a membrane thickness L=5 to 22 μm.
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