Cabot Corp.patents aqueous colored pigment dispersion

摘要

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.