Methods of preparing aqueous colored pigment dispersions,...

Details Methods of preparing aqueous colored pigment dispersions,... Methods of preparing aqueous colored pigment dispersions,...

2007-05-29

2007-05-29

Lorengo, J. A. (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Marking

C106S499000

Reexamination Certificate

active

10758888

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:in-line-formulae description="In-line Formulae" end="lead"?D-N═N-AC,in-line-formulae description="In-line Formulae" end="tail"?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.

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International Search Report and Written Opinion for PCT/US2004/001113, mailed Jun. 11, 2004.

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