Chemicaly diethylenetriamine is converted with a dicarboxylic acid (for example Adipic Acid) into a polyaminoamide. The polyaminoamide is subsequently cross-linked with Epichlorohydrin. The resin gives mechanical strength to the paper tissue under wet conditions and the absorbability of the paper is not affected.Applications for wet-strength resins include paper towels, weather resistant packaging, milk cartons, frozen food packages and vegetable boxes. Products requiring immersion in water such as photographic paper, filter paper and certain textiles in hospital bed sheets and gowns are areas where wet strength is important. Diethylenetriamine N-Aminoethylpiperazine and Triethylenetetramine are appropriate Ethyleneamines for use in wet-strength resins.