METHOD FOR PRODUCING WET PAPER STRENGTH REINFORCING RESIN

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a wet paper strength reinforcing resin excellent in wet paper strength reinforcing effect and capable of using in a state of high concentration. SOLUTION: This method for producing wet paper reinforcing resin comprises reacting a dibasic carboxylic acid and/or its derivative with a polyalkylene, synthesizing a polyamide-polyamineurea condensate by reaction of the amino group of the polyamidepolyamine with urea and reacting epichlorohydrin with the amino group of the resultant condensate to obtain a polyamidepolyamine- epichlorohydrin resin. This polyamidepolyamine-epichlorohydrin resin is excellent in wet paper strength reinforcing effect and stable even in a state of high concentration.