Cellulosic product of improved strength and process therefor

Claim 1

A PROCESS FOR IMPROVING THE PHYSICAL PROPERITES OF CELLULOSIC MATERIALS WHICH COMPRISES REACTING AN AQUEOUS DISPERSION OF A DIALDEHYDE POLYSACCHARIDE CONTAINING FROM ABOUT 1 TO ABOUT 30% WEIGHT PERCENT OF THE DIALDEHYDE POLYSACCHARIDE WITH A WATER-SOLUBLE POLYMERIC NITROGEN-CONTAINING CATIONIZING AGENT SELECTED FROM THE CLASS CONSISTING OF WATER-SOLUBLE POLYAMIDES DERIVED FROM POLYALKYLENE POLYAMINES AND DICARBOXYLIC ACIDS AND DICYANDIAMIDEFORMALDEHYDE POLYCONDENSATION PRODUCTS AT A PH OF FROM ABOUT 3.0 TO ABOUT 4.0 AND A TEMPERATURE OF FROM ABOUT 60* C. TO ABOUT 90* C. FOR A PERIOD OF FROM ABOUT 1 MINUTE TO ABOUT 10 MINUTES, SAID CATIONIZING AGENT BEING EMPLOYED IN AN AMOUNT OF FROM ABOUT 1 TO ABOUT 50 WEIGHT PERCENT BASED ON THE WEIGHT OF THE DIALDEHYDE POLYSACCHARIDE AND ADDING THE RESULTING CATIONIZED DIALDEHYDE POLYSACCHARIDE TO AN AQUEOUS SLURRY OF CELLULOSIC FIBERS.