| abstract |
Wherein the polyolefin resin has an MFR value of 2.0 g / 10 min or less, a 20 μm conversion durability of 100 to 500 sec / 100 cc and a porosity of 20% 60%, and the average flow hole diameter is 100 nm or less. Such a polyolefin microporous membrane has characteristics of excellent withstand voltage characteristics such as mechanical strength such as sting strength and insulation breakdown voltage, and high versatility and safety. |