Pigment, paper containing the same and method of preparation

Claim 1

A NEW COMPOSITION OF MATTER SUITABLE FOR USE AS A PIGMENT, SAID COMPOSITION BEING A REACTION PRODUCT OF ALUMINUM SULFATE AND A HIGHLY-PIGMENTED CELLULOSIC PULP COMPRISING SWOLLEN, HYDRATED AND GELATINIZED CELLULOSIC FIBERS AND AN AMOUNT OF FINELY-DIVIDED PIGMENT IN EXCESS OF THE DRY WEIGHT OF THE FIBERS, AND NOT EXCEEDING ABOUT NINE TIMES THE DRY WEIGHT OF THE FIBERS, THE FINELY-DIVIDED PIGMENT BEING PRECIPITATED, HYDRATED CALCIUM SILICATE, THE CALCIUM SILICATE BEING LARGELY WITHIN THE CELLULOSIC FIBERS AND ALSO ON AND AROUND SAID FIBERS, THE CALCIUM SILICATE WITHIN THE FIBERS HAVING BEEN PRECIPITATED IN SITU THEREIN BY REACTION OF CALCIUM CHLORIDE WITH SODIUM SILICATE WHILE THE CALCIUM CHLORIDE IS WITHIN THE FIBERS WHILE THEY ARE IN A SWOLLEN, HYDRATED AND GELATINIZED STATE, SAID HIGH-PIGMENTED CELLULOSIC PULP FORMING A PULP-LIKE MASS ON ADMIXTURE WITH WATER, SAID REACTION PRODUCT WHEN DISPERSED IN WATER TO FORM A MIXTURE CONTAINING 10 PERCENT BY WEIGHT OF SAID REACTION PRODUCT YIELDING A MIXTURE HAVING A PH WITHIN THE RANGE 4 TO 9.