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US 10,705,405 B2Granted
Composite particles and method for making the same
AssigneeE Ink Corporation
InventorsStephen J. Telfer, Craig A. Herb, Lee Yezek
Life of this patent
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AssigneeE Ink Corporation
InventorsStephen J. Telfer, Craig A. Herb, Lee Yezek
Estimating the term…
A composite particle is provided that includes a base particle and a plurality of hydrophilic oligomeric groups extending from an exterior portion of the base particle, the base particle including a cross-linked polyurea and at least one of a pigment and a dye. The cross-linked polyurea may form a network throughout the base particle. A method of making the composite particle includes providing either a solution containing a dye or a dispersion containing a pigment in a water-dispersible polyfunctional isocyanate dissolved in a water-miscible solvent, forming an emulsion of the solution/dispersion in water, agitating the emulsion while the polyfunctional isocyanate is converted into a cross-linked polyurea, and separating the composite particle containing the cross-linked polyurea and the dye/pigment from the emulsion.
A composite particle comprising a base particle and a plurality of hydrophilic oligomeric groups on an exterior portion of the base particle, the base particle including a cross-linked polyurea and at least one of a pigment and a dye, the cross-linked polyurea forming a network throughout the base particle, wherein the hydrophilic oligomeric groups comprise polyethylene oxide, and wherein the cross-linked polyurea is created by the polymerization of a monomer or oligomer, wherein the monomer or oligomer comprises multiple isocyanate functional groups and a polyethylene oxide functional group.
Dependencies are inferred from the claim text.