Preparation of a manniched polyacrylamide quarternaries thereof

摘要

Cationically modified polymers of acrylamide are prepared by adding to a polyacrylamide an aqueous solution of a lower aliphatic aldehyde followed by a lower alkyl secondary amine. The pH of the dilute solution of the acrylamide polymer which is reacted is adjusted prior to addition of the aldehyde to between 4.5 and 5.5 thereby conducting this reaction at an acidic pH. Additionally, quaternized polymers may be prepared by adding to the cationically modified polyacrylamide a lower alkyl halide quaternizing agent. The pH of the solution of the cationically modified acrylamide polymer prior to quaternization should be 7.5-8.5.