| abstract |
PROBLEM TO BE SOLVED: To provide a polyethylene multilayer microporous membrane excellent in balance of permeability, mechanical strength, heat shrinkage resistance, shutdown property, meltdown property and oxidation resistance, a method for producing the same, and a battery separator. A polyethylene-based resin porous layer A comprising at least two layers, (a) a terminal vinyl group concentration by infrared spectroscopy containing 0.2 or more high-density polyethylene A per 10,000 carbon atoms, and ( b) Polyethylene multilayer microporous membrane with polyethylene resin porous layer B containing high density polyethylene B with terminal vinyl group concentration less than 0.2 per 10,000 carbon atoms by infrared spectroscopy is permeable, mechanical Excellent balance of strength, heat shrinkage, shutdown characteristics, meltdown characteristics and oxidation resistance. [Selection figure] None |