Tubular membrane.

摘要

A method of producing a membrane having substantially uniform porosity in which a blend of a first polymer and a second, immiscible, polymer is extruded to form a structure of the desired cross section in which the polymers are present as interpenetrating networks and leaching out the second polymer so producing a structure comprising the first polymer network characterised in that the second polymer has a lower melt viscosity than, or the same melt viscosity as, the first polymer.