MICROPOROUS POLYOLEFIN MEMBRANE

摘要

The present invention provides a microporous polyolefin membrane having a porosity of 45% to 85% wherein the microporous polyolefin membrane easily absorbs the strain produced when the membrane undergoes compression, and retains excellent permeability and excellent electrical insulation performance even after compression by setting the maximum pore diameter at 0.1 µm to 0.23 µm, the MD elastic modulus at 400 to 2,000 MPa, and the ratio MD elastic modulus/TD elastic modulus at 1.5 to 9.