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AssigneeE Ink Corporation
InventorsLee Yezek, Andrew Drabek, Luke M. Slominski, Jennifer M. Morrison, Stephen J. Telfer, Brian Steinberg
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Polymer shells similar to those described in U.S. Pat. No. 6,822,782 can be formed on pigment particles by (a) physi-sorping a reagent comprising polymerizable groups on to the pigment particles by treating the particle with a reagent having a polymerizable or polymerization-initiating group, such that the reagent will not desorb from the particle surface when the particle is placed in a hydrocarbon medium; or (b) treating pigment particles bearing nucleophilic groups with a reagent having a polymerizable or polymerization-initiating group, and an electrophilic group, thus attaching the polymerizable or polymerization-initiating groups to the particle surface. The zeta potential of the pigment particles can be varied by a process similar to (b) but using a reagent which does not have a polymerizable or polymerization-initiating group.
A process for treatment of pigment particles bearing nucleophilic groups on their surfaces, the process comprising treating the pigment particles with a reagent having an electrophilic group but not bearing a polymerizable or polymerization-initiating group under conditions such that a residue of the reagent is chemically bonded to the pigment particle, the treatment of the pigment particle with the reagent changing the zeta potential of the pigment particle,
A process for treatment of pigment particles bearing nucleophilic groups on their surfaces, the process comprising treating the pigment particles with a reagent having an electrophilic group but not bearing a polymerizable or polymerization-initiating group under conditions such that a residue of the reagent is chemically bonded to the pigment particle, the treatment of the pigment particle with the reagent changing the zeta potential of the pigment particle,
Dependencies are inferred from the claim text.