Abstract: Inkjet ink compositions comprising a liquid vehicle and a modified azo pigment are described. The modified azo pigment comprises the reaction product of at least one diazonium reagent and at least one azo coupler. At least one of the diazonium reagents and/or azo couplers may comprise at least one ionic group, ionizable group, or mixture thereof or at least one alkylene oxide group. The inkjet ink composition does not include a separate dispersant which primarily functions to obtain or maintain stability of the modified azo pigment or the ink jet ink composition. Methods of preparing the inkjet ink compositions are also described.

Abstract: The present invention relates to an inkjet ink composition comprising a liquid vehicle, a pigment, and a polymeric dispersant. In one embodiment, the pigment comprises a colorant having the formula A-(B)x or is a carbon black pigment and the polymeric dispersant comprises a polymeric group and at least one group having the formula -A?-(B)y(C)z, wherein A and A? are organic chromophore groups. In a second embodiment, the polymeric dispersant comprises a polymeric group and an organic chromophore group capable of interacting with the pigment.

Abstract: The present invention relates to an inkjet ink composition comprising a liquid vehicle, a pigment, and a polymeric dispersant. In one embodiment, the pigment comprises a colorant having the formula A-(B)x or is a carbon black pigment and the polymeric dispersant comprises a polymeric group and at least one group having the formula -A?-(B)y(C)z, wherein A and A? are organic chromophore groups. In a second embodiment, the polymeric dispersant comprises a polymeric group and an organic chromophore group capable of interacting with the pigment.

Abstract: The present invention relates to an inkjet ink composition comprising a liquid vehicle, a pigment, and a polymeric dispersant. In one embodiment, the pigment comprises a colorant having the formula A-(B)x or is a carbon black pigment and the polymeric dispersant comprises a polymeric group and at least one group having the formula -A?-(B)y(C)z, wherein A and A? are organic chromophore groups. In a second embodiment, the polymeric dispersant comprises a polymeric group and an organic chromophore group capable of interacting with the pigment.

Abstract: The present invention describes methods for preparing aqueous colored pigment dispersions comprising the step of combining, in any order, a) a colored pigment, b) an azo coupler, c) an aromatic amine, d) a diazotizing agent, and e) 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. These colored pigment dispersions are particularly useful as an inkjet ink composition. Also disclosed are inkjet ink compositions comprising a) a liquid vehicle, b) a colored pigment, and c) a dispersant having the formula: D-N?N-AC, wherein AC is an azo coupling component and D is a diazo component comprising at least one ionic group, at least one ionizable group, or a mixture of at least one ionic group or ionizable group.

Abstract: The present invention describes methods for preparing aqueous colored pigment dispersions comprising the step of combining, in any order, a) a colored pigment, b) an azo coupler, c) an aromatic amine, d) a diazotizing agent, and e) 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. These colored pigment dispersions are particularly useful as an inkjet ink composition.