PROCESS FOR THE ALKALINE SAPONIFICATION OF CROSSLINKED ACRYLONITRILE BEAD POLYMERS

摘要

The alkaline saponification of acrylonitrile bead polymers provides weakly acidic cation exchangers with little intrinsic color and with reduced residual nitrogen content if the saponification is begun at a temperature T1 of from 70 to 120.degree.C and, once a degree of saponification of at least 65% has been reached, is completed at a temperatu re T2 of from 120 to 180.degree.C.