Web-forming fibrous suspensions of improved freeness

Claim 1

A PROCESS OF MANUFACTURING PAPER WHICH COMPRISES FORMING AN AQUEOUS SUSPENSION OF CELLULOSE PAPERMAKING FIBERS, ADDING THERETO BETWEEN ABOUT 0.5% AND 5% OF A WATER-SOLUBLE ALUMINUM METAL SALT BASED ON THE DRY WEIGHT OF FIBERS, THEREBY DECREASING THE PH OF THE SUSPENSION BELOW 5, ADDING SUFFICIENT OF A WATER-SOLUBLE ALKALI TO DECREASE THE ACIDITY OF THE SUSPENSION BY AT LEAST 0.1 OF A PH UNIT BUT INSUFFICIENT TO RAISE THE PH OF THE SUSPENSION ABOVE ABOUT 8, ADDING BETWEEN ABOUT 0.0001% AND 0.1% BASED ON THE DRY WEIGHT OF THE FIBERS OF A WATER-SOLUBLE ANIONIC LINEAR CARBON CHAIN POLYMER HAVING A MOLECULAR WEIGHT IN EXCESS OF 5 MILLION SUBSTANTIALLY COMPOSED OF CARBAMOYLALKYLENE AND CARBOXYALKYLENE LINKAGES CONTAINING NOT MORE THAN 4 CARBON ATOMS EACH, THE NUMBER OF CARBOXYALKYLENE LINKAGES BEING BETWEEN ABOUT 2% AND 15% OF THE TOTAL NUMBER OF CARBAMOYLAKYLENE AND CARBOXYALKYLENE LINKAGES, SHEETING SAID SUSPENSION ON A PAPERMAKING SCREEN TO FORM A WATERLAID WEB, DRAINING FREE WATER FROM SAID WEB, AND DRYING SAID WEB TO FORM PAPER.