Patent ID: 7387732

Claim:
Process for preparing a membrane comprising providing a polymer solution by mixing in a solvent at least one polymeric acid halide with SO 2 X, POX 2 , COX or BX 2 groups where X═F, Cl, Br, or I, and at least one metal organic or element organic compound selected from the group consisting of metal/element alkoxides/esters of Ti, Zr, Sn, Si, B, or Al, metal acetylacetonates, mixed compounds of metal/elemental alkoxides and metal acetylacetonates, and/or organic amino compounds of Ti, Zr, Sn, Si, B, or Al; wherein said solvent is selected from N-methylpyrrolidinone (NMP), N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), dimethylsulfoxide (DMSO), sulfolane, tetrahydrofuran, dioxan, glyme, diglyme, or triglyme.