Patent ID: 8277932

Claim:
A non-porous membrane formed from a composition comprising: at least one hydrophilic polymer, at least one cross-linking agent capable of cross-linking the hydrophilic polymer, at least one base, and at least one amino compound selected from the group consisting of a polyamine and an aminoacid salt, wherein the aminoacid salt has the formula: wherein R 1 , R 2 , R 3 , and R 4 are hydrogen or hydrocarbon groups having from 1 to 4 carbon atoms, n is an integer ranging from 0 to 4, A m+ is at least one of a cation having a valence of 1 to 3 or an amine cation having the formula: wherein R 5 and R 6 are hydrogen or hydrocarbon groups having from 1 to 4 carbon atoms, R 7 is hydrogen or a hydrocarbon group having from 1 to 4 carbon atoms or an alkyl amine of from 2 to 6 carbon atoms and 1 to 4 nitrogen atoms, y is an integer ranging from 1 to 4, and m is an integer equal to the valence of the cation; wherein said base is selected from the group consisting of potassium hydroxide, sodium hydroxide, lithium hydroxide, triethylamine, N,N-dimethylaminopyridine, hexamethyltriethylenetetraamine, potassium carbonate, sodium carbonate, lithium carbonate, and combinations thereof, and wherein the hydrophilic polymer is selected from the group consisting of polyvinylalcohol, polyvinylacetate, polyethylene oxide, polyvinylpyrrolidone, polyacrylamine, and copolymers thereof.