Patent ID: 8420732

Claim:
A polybenzimidazole solution consisting of: a polybenzimidazole dissolved in an ionic liquid, said ionic liquid being selected from the group consisting of: choline chloride/urea mixtures, choline chloride/oxalic acid mixtures, 1-ethyl-3-methylimidazolium acetate, 1-ethyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium bis(triflyl)amide, 1-ethyl-3-methylimidazolium ethyl sulfate, 1-ethyl-3-methylimidazolium diethyl sulfate, 1-ethyl-3-methylimidazolium formate, 1-ethyl-3-methylimidazolium bis(trifluoromethane) sulfonamide, 1-ethyl-3-methylimidazolium phosphate, 1-methylimidazolium hydrogen sulfate, 1-butyl-1-methylpyrrolidinium trifluoromethylsulfate, 1-allyl-3-methylimidazolium acetate, 1-allyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium acetate, 1-butyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium dicyanoamide, 1-butyl-3-methylimidazolium formate, 1-butyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium hydroxide, 1-butyl-3-methylimidazolium hydrogen sulfate, N-methyl morpholine N oxide, 1-hexyl-3-methylimidazolium chloride, 1-butyl-2,3-dimethylimidazolium chloride, 1-allyl-2,3-diemthylimidazolium bromide, 1-butyl-3-methylpyridinium chloride, N-ethylpyridinium chloride, benzyldimethyl(tetradecyl)-ammonium chloride, 1,3-dibutylimidazolium bromide, 1,3-dibutylimidazolium tetrafluoroborate, and mixtures thereof, and excluding 1-butyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium hydroxide, and 1-butyl-3-methylimidazolium tetrafluoroborate.