Production of pigmented cellulosic pulp

Claim 1

THE METHOD OF PRODUCING PIGMENTED CELLULOSIC PULP WHICH COMPRISES ADDING CELLULOSE FIBERS TO A CALCIUM CHLORIDE SOLUTION TO FORM A RESULTANT PULP CONTAINING FROM ABOUT 5% TO 10% CALCIUM CHLORIDE AND AT LEAST ABOUT 1% OF FIBERS, SUBJECTING THE PULP TO PROLONGED MECHANICAL TREATMENT, MAINTAINING THE FIBERS IN THE CALCIUM CHLORIDE SOLUTION UNTIL THE COMBINED EFFECTS THEREOF AND THE MECHANICAL TREATMENT HAVE RESULTED IN THE FIBERS BECOMING SWOLLEN, HYDRATED AND GELATINIZED, THEREAFTER ADDING A SOLUBLE SALT WHICH WILL REACT WITH THE CALCIUM CHLORIDE TO FORM A PRECIPITATED CALCIUM COMPOUND PIGMENT, THE AMOUNTS OF THE CALCIUM CHLORIDE AND SAID SOLUBLE SALT BEING SUCH AS TO PRECIPITATE WITHIN, ON AND AROUND THE MODIFIED CELLULOSE FIBERS AN AMOUNT OF THE CALCIUM COMPOUND PIGMENT IN EXCESS OF THE WEIGHT OF THE MODIFIED FIBERS, ON A DRY BASIS.

Claim 2

THE METHOD OF PRODUCING PIGMENTED CELLULOSIC PULP WHICH COMPRISES ADDING CELLULOSE FIBERS TO A CALCIUM CHLORIDE SOLUTION TO FORM A RESULTANT PULP CONTAINING FROM ABOUT 5% TO 10% CALCIUM CHLORIDE AND AT LEAST ABOUT 1% OF FIBERS, SUBJECTING THE PULP TO PROLONGED MECHANICAL TREATMENT, MAINTAINING THE FIBERS IN THE CALCIUM CHLORIDE SOLUTION UNTIL THE COMBINED EFFECTS THEREOF AND THE MECHANICAL TREATMENT HAVE RESULTED IN THE FIBERS BECOMING SWOLLEN, HYDRATED AND GELATINIZED, THEREAFTER ADDING A SOLUBLE SALT WHICH WILL REACT WITH THE CALCIUM CHLORIDE TO FORM A PRECIPITATED CALCIUM COMPOUND PIGMENT, THE AMOUNTS OF THE CALCIUM CHLORIDE AND SAID SOLUBLE SALT BEING SUCH AS TO PRECIPITATE WITHIN, ON AND AROUND THE MODIFIED CELLULOSE FIBERS AN AMOUNT OF THE CALCIUM COMPOUND PIGMENT IN EXCESS OF THE WEIGHT OF THE MODIFIED FIBERS, ON A DRY BASIS.