Polyolefin microporous membrane

摘要

The present invention provides a polyolefin microporous membrane having a surface structure comprising fine spaces formed by partitioning micro-fibrils and a network formed by uniform dispersion of said micro-fibrils, wherein the average diameter of the micro-fibrils is 20 to 100 nm and the average distance between the micro-fibrils is 40 to 400 nm; and a process for producing said poly-olefin microporous membrane.