Highly asymmetric polymeric membranes with large pores which yield bubble points in the range of 0.5 to 25 psid and superior flow characteristics. The membranes can be cast from both metastable dispersions and from homogenous casting formulations. The technique of synthesis involves exposure of the cast...http://www.google.es/patents/US6440306?utm_source=gb-gplus-sharePatente US6440306 - Large pore synthetic polymer membranes
