FILTER MATERIAL FOR MICRO-FILTER

摘要

A filter material for microfilters which is made of a micorporous film made of thermoplastic resin having micropores, the material being characterized in that the micropores are formed from a 3-dimensional network made of trunk fibrils extending in one direction of the film and branch fibrils through which the trunk fibrils are connected to one another, and the density of the branch fibrils is higher than the density of the trunk fibrils. This filter material is strength enough for practical use and also exhibits a high separation efficiency.