초록 ▼

A process for making paper with increased wet and dry strength by incorporating into the pulp suspension an ionic thermosettable resin which is the reaction product of dialdehyde and epihalohydrin, or epihalohydrin equivalent, with a copolymer containing monomer units derived by polymerization of mo

A process for making paper with increased wet and dry strength by incorporating into the pulp suspension an ionic thermosettable resin which is the reaction product of dialdehyde and epihalohydrin, or epihalohydrin equivalent, with a copolymer containing monomer units derived by polymerization of monomers comprising acrylamide or alkyl-substituted acrylamide and diallylamine or an acid salt thereof. The paper has wet and dry strength greater than that of paper not containing the resin and has a higher repulpability index than wet strength paper that is essentially the same but contains conventional polyazetidinium ion containing wet strength resin instead of the ionic thermosettable resin.

대표청구항 ▼

[ What is claimed is:] [1.]1. A process for making paper with increased wet and dry strength comprising:(a) providing an aqueous pulp suspension;(b) adding to the pulp suspension a strength additive comprising an ionic thermosettable resin which is the reaction product of dialdehyde and epihalohydri

[ What is claimed is:] [1.]1. A process for making paper with increased wet and dry strength comprising:(a) providing an aqueous pulp suspension;(b) adding to the pulp suspension a strength additive comprising an ionic thermosettable resin which is the reaction product of dialdehyde and epihalohydrin, or epihalohydrin equivalent, with a copolymer containing monomer units derived by polymerization of monomers comprising acrylamide or alkyl-substituted acrylamide and diallylamine or an acid salt thereof; and(c) converting the aqueous suspension obtained in (b) to a paper web and drying the web to obtain paper.