Electrophoretic media and processes for the production thereof
AssigneeE Ink Corporation
InventorsThomas H. Whitesides, Qingye Zhou, Russell J. Wilcox
Life of this patent
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Abstract
A first electrophoretic medium comprises an electrically charged particle suspended in a suspending fluid, the particle having a polymeric shell having repeating units derived from at least one monomer the homopolymer of which is incompatible with the suspending fluid. A second, similar electrophoretic medium comprises a suspending fluid, and first and second types of electrically charged particle suspended in the suspending fluid, the two types of particle having differing optical characteristics but both having polymeric shells. The polymeric shells are arranged such that homoaggregation of the two types of particles is thermodynamically favored over heteroaggregation.
Claims25
An electrophoretic medium comprising a first electrically charged particle suspended in a suspending fluid, the first particle having a polymeric shell having repeating units derived from at least one monomer the homopolymer of which is incompatible with the suspending fluid, the electrophoretic medium further comprising a second electrically charged particle having at least one optical property differing from that of the first electrically charged particle, the second electrically charged particle having a polymeric shell.
An electrophoretic medium comprising:
- a suspending fluid;
- a plurality of first electrically charged particles suspended in the suspending fluid, the first electrically charged particles having a polymeric shell;
- and
- a plurality of second electrically charged particles suspended in the suspending fluid, the second electrically charged particles having an optical property differing from that of the first electrically charged particles, and a polymeric shell;
- wherein the polymeric shells are arranged such that homoaggregation of the first and second particles is thermodynamically favored over heteroaggregation.
Dependencies are inferred from the claim text.