Method for preparation of amphoteric ion-exchangers by substitution of hydrophilic polymers

Abstract

The invention relates to a method for preparation of cationactive and amphoteric ion-exchangers from non-ionogenic crosslinked copolymers containing hydroxyl groups by their reaction with mineral acids, addition products of sulfur trioxide, sulfuric acid or chlorosulfuric acid with alcohols or pyridine, unsaturated compounds, as acrylonitrile, methacrylonitrile or sodium vinylsulfonate in a strongly alkaline medium, or with halogenoalkylammonium compounds. The starting copolymer containing hydroxyl groups is prepared by the suspension copolymerization of monomers, selected from the group which comprises hydroxyalkyl methacrylates and acrylates and oligoglycol acrylates and methacrylates, with crosslinking divinyl monomers, e.g. divinylbenzene, ethylene dimethacrylate, butylenediol dimethacrylate or diacrylate, and advantageously has the macroporous structure. The products are suitable for application in column process thanks to their favorable mechanical properties, namely for chromatographic separation of hydrophilic compounds, e.g. biological materials as aminoacids. The hydrophilicity of the product may be varied by selection of monomers for the starting copolymer, by the type of ionactive substitution and by the degree of transformation.

Dependencies are inferred from the claim text.