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US 10,351,708 B2Granted
Cationic modified self-dispersing pigment dispersions
AssigneeE. I. Du Pont de Nemours and Company
InventorsMichael Stephen Wolfe, Charles T. Berge, Loretta L. Tam, Cullen Kirkpatrick
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Abstract
This invention pertains to self-dispersing pigment dispersions. The self-dispersing pigments are modified with a multivalent cation and an anionic polymer.
Claims12
An aqueous pigment dispersion comprising:
- a self-dispersing pigment having at least one type of hydrophilic functional group bonded onto a surface of the self-dispersing pigment, said at least one type of hydrophilic functional group comprising a carboxyl group;
- a multivalent cation selected from the group consisting of Mg2+, Ca2+, Cu2+, Al3+, Fe3+, and mixtures thereof, wherein said multivalent cation is adsorbed onto said self-dispersing pigment via ionic bonds between the multivalent cation and surface acid group on the self-dispersing pigment displacing monovalent cation(s) associating with the carboxyl group on the surface of the self-dispersing pigment, the displaced monovalent cation(s) are removed from the pigment dispersion;
- and
- an anionic polymeric binder.
1 more element
Dependencies are inferred from the claim text.