Isotropic porous polymer beads having controllable surface porosity and large pore diameters from about 0.002 to about 5 microns are produced from solutions of an acrylonitrile polymer or a copolymer by a thermally-induced phase separation process including intensively shearing the polymer solution into...http://www.google.fr/patents/US4940734?utm_source=gb-gplus-shareBrevet US4940734 - Process for the preparation of porous polymer beads
Process for the preparation of porous polymer beads
