Methods of preparing electrophoretic dispersions containing two types of particles with different colors and opposite charges
DCFirst Claim
1. A dielectric dispersion, comprising:
- (a) a dielectric fluid;
(b) a first plurality of particles of a first color having a surface charge of a selected polarity dispersed within said dielectric fluid; and
(c) a second plurality of particles of a second color which contrasts substantially with said first color, having a surface charge of opposite polarity to that of said first plurality of particles; and
(d) means for preventing coagulation of said first and second plurality of particles, wherein said means includes a charge control agent for positively charging said first plurality of particles., a second charge control agent for negatively charging said second plurality of particles, and a stabilizer for thermodynamically stabilizing said first plurality of particles and said second plurality of particles, wherein said stabilizer is selected from the group consisting of homopolymers, copolymers, graft polymers, block polymers, and natural high molecular weight compounds.
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Abstract
A dielectric dispersion for use in an electrophoretic display includes a dielectric fluid, a first plurality of particles of a first color having a surface charge of a selected polarity dispersed within the dielectric fluid and a second plurality of particles of a second color having a surface charge of opposite polarity to that of the first plurality and a steric repulsion thereto preventing coagulation of the first and second pluralities. In one embodiment, the first and second plurality of particles are each formed by separate two stage dispersion polymerization reactions. Each set of particles is formed with unique secondary and functional monomers. Corresponding charge control agents are added to the dispersion to establish opposite polarities on the respective particles.
255 Citations
18 Claims
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1. A dielectric dispersion, comprising:
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(a) a dielectric fluid; (b) a first plurality of particles of a first color having a surface charge of a selected polarity dispersed within said dielectric fluid; and (c) a second plurality of particles of a second color which contrasts substantially with said first color, having a surface charge of opposite polarity to that of said first plurality of particles; and (d) means for preventing coagulation of said first and second plurality of particles, wherein said means includes a charge control agent for positively charging said first plurality of particles., a second charge control agent for negatively charging said second plurality of particles, and a stabilizer for thermodynamically stabilizing said first plurality of particles and said second plurality of particles, wherein said stabilizer is selected from the group consisting of homopolymers, copolymers, graft polymers, block polymers, and natural high molecular weight compounds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification