Patent ID: 6806350
Filing Date: 2004-10-19
Classification: C08F

Abstract:
A washing process for the purification of polymers containing N or amine, ammonium or spirobicyclic ammonium groups, comprising cationic N-containing groups, and suitable counterions, characterized in that the gelled polymers obtained by polymerization and crosslinkinga) [lacuna] partially or completely deprotonated by addition of a base, b) the partially or completely deprotonated polymers are washed, then c) optionally reprotonated in an organic solvent or in an organic solvent/water mixture by addition of an acid, after which d) the mixture is optionally washed with an organic solvent or an organic solvent/water mixture for the shrinkage of the gels and, optionally, e) following step c) or d), steps a) to c) or to d) are repeated.