Patent ID: 7081512

Claim:
A process for producing a composition comprising a polyamine-epihalohydrin resin that has a low level of CPD-producing species and good gelation stability, comprising the steps: (A) preparing the resin with a ratio of epihalohydrin:amine of less than about 1.1:1.0; (B) treating a composition comprising a polyamine-epihalohydrin resin which includes CPD forming species with at least one basic agent, under conditions to at least one of reduce and remove the CPD-forming species; (C) subsequent to the base treatment, treating the composition comprising a polyamine-epihalohydrin resin at a temperature at least about 35° C. for a time about 20 minutes to 5 hours with at least one acidic agent, under conditions to obtain a gelation storage stable composition; and wherein the resulting reduced CPD-forming, gelation storage stable resin composition produces less than about 250 ppm dry basis of CPD, when stored at pH 1 for 24 hours at 50° C. and measured at 24 hours.