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US 6,663,802 B2Granted
Processes for making bichromal particles for gyricon displays
AssigneeXerox Corporation
InventorGuerino G. Sacripante
Life of this patent
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Abstract
In-situ processes for making bichromal particles include forming particles having a one color and an anionic surface charge, and separately forming particles having another color and a cationic surface charge. The anionic and cationic particles are mixed, and aggregated to form bichromal aggregates. The aggregated particles are coalesced to form bichromal particles. The bichromal particles can be used in gyricon sheets and gyricon displays.
Claims21
An in-situ process for making bichromal particles, comprising:
- forming first particles having a first color and an anionic surface charge;
- separately forming second particles having a second color and a cationic surface charge;
- mixing the first particles and second particles;
- aggregating the first particles and second particles in a one-to-one ratio with respect to each other;
- and
- coalescing the aggregated first particles and second particles to form bichromal particles that comprise one first particle and one second particle.
3 more elements
An in-situ process for making bichromal particles, comprising:
- forming first particles having a first color and an anionic surface charge from a first emulsion latex;
- separately forming second particles having a second color and a cationic surface charge from a second emulsion latex;
- mixing the first particles and second particles;
- aggregating the first particles and second particles in a one-to-one ratio with respect to each other;
- and
- coalescing the aggregated first particles and second particles to form bichromal particles that comprise one first particle and one second particle;
- wherein the first particles and second particles have approximately equal particle sizes;
- wherein the first emulsion latex comprises a first terpolymer, the second emulsion latex comprises a second terpolymer, and the first terpolymer and the second terpolymer have respective glass transition temperatures that differ by less than about 5° C.;
- and
- wherein the first terpolymer and the second terpolymer have respective molecular weights that differ by less than about 5,000.
7 more elements
A process for making a gyricon sheet, comprising:
- forming first particles having a first color and an anionic surface charge;
- separately forming second particles having a second color and a cationic surface charge;
- mixing the first particles and second particles;
- aggregating the first particles and second particles in a one-to-one ratio with respect to each other;
- coalescing the aggregated first particles and second particles to form bichromal particles that comprise one first particle and one second particle;
- providing a transparent optical medium comprising a plurality of cavities, the cavities containing a transparent dielectric fluid;
- and
- placing a single one of the bichromal particles in each of the cavities.
5 more elements
Dependencies are inferred from the claim text.