VERFAHREN ZUR HERSTELLUNG EINER WAESSRIGEN LOESUNG EINES WAERMEHAERTBAREN HARZES, WAESSRIGE LOESUNG EINES WAERMEHAERTBAREN HARZES, DEREN VERWENDUNG BEI DER HERSTELLUNG VON NASSFESTEM PAPIER UND UNTER VERWENDUNG DERSELBEN HERGESTELLTES NASSFESTES PAPIER

摘要

A durable aqueous solution of a thermosetting resin having a relatively high solid content which imparts a high degree of wet strength to paper, is produced by the reaction of an aliphatic dicarboxylic acid with a polyalkylenepolyamine to form a polyamidopolyamine, which is successively subjected to reaction with epichlorohydrin, the first reaction being carried out using a molar ratio of aliphatic dicarboxylic acid to polyalkylenepolyamine of 1:1.0 to 1.2 and continued until the viscosity at 25 DEG C. of 50% aqueous solution of resulting polyamidopolyamine reaches 400 to 1,000 cps, and the second reaction being carried out using epichlorohydrin in an amount of 1.6 to 1.7 moles per mole of the polyamide secondary amine and continued until the viscosity at 25 DEG C. of 15% aqueous solution of the resulting product reaches 30 to 150 cps.