MICROPOROUS POLYESTER MEMBRANES AND POLYMER ASSISTED PHASE INVERSION PROCESS FOR MAKING SAME

A process is disclosed for producing a microporous membrane suitable as a membrane filler in liquid permeation, micro-filtration and ultrafiltration in reverse osmosis, as a porous support substrate or for another reverse osmosis membrane,in electrophoresis, curtain electrophoresis, thin layer, gas or liquid chromotography or as a substrate for enzyme attachment. The process comprises dissolving a polyester resin and assisting polymer in a mutual solvent, casting the solution and evaporating the solvent from the polymer. Additionally, the assisting polymer may be leached from the membrane.