Patent ID: 9644101
Date: 2017-05-09
CPC Classifications: B41M,C01P,C09C,D21H

Claim:
1. A product obtained by a process consisting of the steps of: (a) treating a natural ground calcium carbonate-containing mineral pigment, that is dispersed with a dispersing agent, in an aqueous suspension for 0.2 to 24 hours with: to obtain an aqueous suspension of mineral pigment having a pH of greater than 7.5 measured at 20° C. between one hour and twenty-four hours after treatment, wherein addition of the one or more of aluminium silicate, synthetic silica, calcium silicate, silicate of a monovalent salt, sodium aluminate and potassium aluminate to the aqueous suspension occurs before, during or after reaction of the surface of the natural ground calcium carbonate with the phosphoric acid; and (b) optionally adjusting the pH of the aqueous suspension of mineral pigment obtained in step (a) by the addition of a base.