POLYETHYLENE MICROPOROUS MEMBRANE AND PROCESS FOR MANUFACTURING SAME

摘要

A polyethylene microporous membrane which exhibits a Gurley air permeability of 1 to 1,000 sec/100mL/25mum and in which the total length of widths of waves in the widthwise direction of the microporous membrane is at most one-third of the overall width of the microporous membrane, and a process for manufacturing the same. The present invention provides a polyethylene microporous membrane having excellent flatness without impairing the other important physical properties such as permeability.