Cationic sizing emulsions and paper sized therewith

Claim 1

A PROCESS FOR THE MANUFACTURE OF SIZED PAPER OF IMPROVED TENSILE STRENGTH WHICH COMPRISES FORMING AN AQUEOUS SUSPENSION OF CELLULOSE PAPERMAKING FIBERS, ADDING THERETO AN EMULSION OF A HYDROPHOBIC KETENE DIMER IN AN AQUEOUS MEDIUM CONTAINING A THERMOSETTING CATIONIC AMIDO-ALDEHYDE CONDENSATION PRODUCT IN ACID CONDENSED YET HYDROPHILIC STAGE AS PAPER-STRENGTHENING AGENT, THE WEIGHT OF SAID KETENE DIMER BEING BETWEEN 1/10% AND 3% OF THE DRY WEIGHT OF THE FIBERS AND THE WEIGHT OF SAID CATIONIC NITROGENOUS PAPER-STRENGTHENING AGENT BEING BETWEEN ABOUT 1/4% AND 3% OF THE DRY WEIGHT OF THE FIBERS, UNIFORMLY DISTRIBUTING SAID ADDED EMULSION THROUGH SAID AQUEOUS SUSPENSION WHEREBY A SUBSTANTIAL PROPORTION OF SAID ADDED KETENE DIMER AND PAPER-STRENGTHENING AGENT ARE UNIFORMLY ADSORBED ON THE SURFACAE OF SAID FIBERS, SHEETING SAID SUSPENSION TO FORM A WATER-LAID WEB AT ABOUT PH 4.5, AND HEATING SAID WEB TO DRY THE SAME AND TO DEVELOP AT LEAST A SUBSTANTIAL PART RESPECTIVELY OF THE SIZING AND WET STRENGTHENING PROPERTIES OF THE KETENE DIMER AND PAPER STRENGHTENING AGENT THEREON.