Patent No. U.S. 7,223,302 B2
Cabot Corporation has been granted a patent for a method of preparing an aqueous colored pigment dispersion comprised of the steps of combining a colored pigment and an azo coupler to form a pretreated colored pigment, and combining, in any order, the pretreated colored pigment, an aromatic amine, a diazotizing agent, and an aqueous medium, wherein the aromatic amine comprises as least one ionic group, at least one ionizable group, or a mixture of at least one ionic group and at least one ionizable group.