Patent ID: 6280791
Filing Date: 2001-08-28
Classification: B01D

Abstract:
A method of fabricating a reinforced, continuous, geometrically symmetrical microporous filtration membrane which comprises:providing a porous support material having first and second sides;impregnating said support material with a first casting solution;applying a second casting solution over said first side of said impregnated support material;substantially simultaneously with the application of the second casting solution, applying a third casting solution over said second side of said impregnated support material;quenching the porous support material having the casting solutions applied thereto to form a continuous microporous membrane having a middle region disposed between an upper region and a lower region from the first, second and third casting solutions such that said support material is embedded within said middle region and said middle region has a pore size at least about 50% greater than the pore size of at least one of said upper region and said lower region.