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US 7,922,805 B2Granted
Method of preparing oxidized modified pigments and inkjet ink compositions comprising the same
AssigneeCabot Corporation
InventorsMark H. Kowalski, Feng Gu
Life of this patent
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Abstract
The present invention relates to oxidized modified pigments and dispersions as well as methods of preparing them. Also disclosed are aqueous inkjet ink compositions comprising oxidized modified pigments.
Claims16
A method of preparing an oxidized modified pigment comprising the steps of:
- a) forming an aqueous modified pigment dispersion comprising a modified pigment, wherein the modified pigment comprises a pigment having attached at least one organic group, and wherein the organic group comprises at least one ionic group, at least one ionizable group, or mixtures thereof, and
- b) treating the aqueous modified pigment dispersion with at least one oxidizing agent to form the oxidized modified pigment.
Dependencies are inferred from the claim text.