Weakly acidic cation exchangers in bead form have been prepared by the following methods:(1)copolymerization of methyl methacrylate with a variable amount of 55% solution of divinylbenzene, followed by hydrolysis either with an acid or a base;(2) copolymerization of methacrylic acid with a variable amount of 55% solution of divinylbenzene;(3)copolymerization of methacrylic acid with allyl methacrylate and a 55% solution of divinylbenzene.