Strength of paper made from pulp containing surface active, carboxyl compounds

摘要

This invention is directed to a process for preparing an aqueous papermaking suspension containing a polyelectrolyte complex comprising providing an aqueous suspension of pulp fibers containing a water-soluble cationic polymer and a water-soluble anionic polymer that are reactable in the aqueous suspension to form the polyelectrolyte complex, and a multivalent cation having at least a +3 charge, and forming the polyelectrolyte complex. It also includes the process wherein the aqueous suspension of pulp fibers contains surface active carboxyl compounds and water-soluble anionic compounds. It further includes the process wherein the aqueous papermaking suspension is sheeted and dried to obtain paper of improved strength.