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US 6,280,791 B1Granted
Process of making a three-region reinforced microporous filtration membrane
AssigneeCuno Incorporated
InventorsMark T Meyering, Jack H. Vining, Jr., Thomas Badenhop
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Abstract
A process for making a reinforced, continuous, geometrically symmetrical microporous filtration membrane comprising a porous support material and a continuous microporous membrane having a middle region disposed between an upper region and a lower region, wherein 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.
Claims19
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.
2 more elements
Dependencies are inferred from the claim text.