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US 2012/0222585 A1Published application
Sequential oxidation of carbon black for ink-jet dispersion
AssigneeE.I. du Pont de Nemours and Company
InventorsMichael J. Eiseman, Harry Joseph Spinelli, William F. Delgiorno
Life of this patent
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Abstract
A process for preparing self-dispersing pigment dispersion for ink-jet application is provided in which a carbon black pigment is first oxidized in a gaseous phase and subsequently functionalized in an aqueous environment.
Claims15
A process for making a self-dispersing pigment dispersion comprising the steps of:
- (a) subjecting a carbon black pigment to oxidation in a gaseous environment to an acid value of greater than 0.1 mmol of acid per gram of pigment;
- and
- (b) functionalizing the product of step (a) in an aqueous environment.
Dependencies are inferred from the claim text.