Epoxidised polyamide resins

The chemistry of the production of polyamide resin is very similar to the original process by which nylon was produced. In the Nylon 66 process a dicarboxylic acid, such as adipic acid is reacted with a six carbon amine, for example hexamethylene-diamine, to produce a synthetic fiber In the case of polyamide resin, a dicarboxylic add is reacted or condensed with an amine such as diethylenetriamine to form an amino polyamide. The secondary amine groups of this water soluble polymer are then reacted with epichlorohydrin to form the aminopolyamide epichlorohydrin intermediate. This is then crosslinked to build molecular weight whilst maintaining solubility. The polymerization reaction is terminated by dilution and acidification. 

The amount of polyamide-epichlorohydrin resin required in hygienic paper production is between 0.1 and 4% dry substance, calculated on the paper. These 

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