Abstract: In the production of a water-soluble, cationic high polymer of (A) at least one of acrylamide and methacrylamide and (B) at least one of ammonium type monomers of either one of the formulas: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group, R.sub.2 and R.sub.3 are each a lower alkyl group, R.sub.4 is a hydrogen atom, a lower alkyl group, an aryl group, a hydroxy(lower)alkyl group, a benzyl group or a group of the formula: --CH.sub.2 COO(CH.sub.2).sub.m CH.sub.3 (m being an integer of 0 or 1), R.sub.5 .crclbar. is a group of either one of the formulas: --(CH.sub.2).sub.2 COO.crclbar. and --(CH.sub.2).sub.3 SO.sub.3 .crclbar.

Abstract: In the production of a water-soluble, cationic high polymer of (A) at least one of acrylamide and methacrylamide and (B) at least one of ammonium type monomers of either one of the formulas: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group, R.sub.2 and R.sub.3 are each a lower alkyl group, R.sub.4 is a hydrogen atom, a lower alkyl group, an aryl group, a hydroxy(lower)alkyl group, a benzyl group or a group of the formula: --CH.sub.2 COO(CH.sub.2).sub.m CH.sub.3 (m being an integer of 0 or 1), R.sub.5.sup.- is a group of either one of the formulas: --(CH.sub.2).sub.2 COO.sup.- and -(CH.sub.2).sub.3 SO.sub.3.sup.

Abstract: A polymeric flocculant composition having an excellent flocculation effect, which comprises (a) an acrylamide polymer containing 50 or more molar % of an acrylamide unit and (b) at least one amino resin precondensate selected from the group consisting of urea-formaldehyde, melamine-formaldehyde, guanidine-formaldehyde and dicyandiamide-formaldehyde, wherein the acrylamide polymer and the amino resin precondensate are admixed in a ratio of 90 : 10 to 99 : 1 by weight. The polymeric flocculant composition disclosed herein is useful for cleaning waste water.

Abstract: High molecular weight acrylamide polymers useful as flocculants are obtained by copolymerizing acrylamide with a monovinyl monomer in a mixture of water and acetone in the presence of a redox type catalyst comprising a persulfate, an aliphatic amine and at least one Lewis acid selected from the group consisting of chlorides and bromides of aluminum, antimony, lithium and zinc.