Hercules Corporation

Massimo Berri

Richard J Riehle

Ronald Busink

Wilm Stevels

Wim Stevels

A process for rendering a polyamine-epihalohydrin resin storage stable, is described. The process entails treating a polyamine-epihalohydrin resin composition, where the resin is formed in a reaction having a molar ratio of epihalohydrin to secondary amine group of less than about 0.5 and where the composition has a solids content of at least 15 wt % and includes CPD-forming species, with at least one enzymatic agent under conditions to inhibit, reduce or remove the CPD-forming species to obtain a gelation storage stable reduced CPD-forming resin so that the composition containing the reduced CPD-forming polyamine-epihalohydrin resin when stored for 24 hours at 50&#xb0; C. and a pH of about 1.0 releases less than about 100 ppm dry basis of CPD.

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Amersfoort, Netherlands

Massimo Berri