US5360689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colored polymeric dielectric particles and method of manufacture
Assignee: AUO Corp
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Filing: 1993-05-21
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Granted: 1994-11-01
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Expires: 2013-05-21
Abstract
Abstract A process for forming dielectric particles includes admixing a vinyl halide monomer and a crosslinker in a liquid dispersion medium to form a first mixture. A second mixture of an initiator and a stabilizer is prepared and added to the first mixture to form a third mixture in which the monomer polymerizes to form white crystalline polymer particles which are sonified for uniformity. The particles may be stained by exposure to a dehydrohalegenation reagent and dispersed in an electrophoretic fluid for use in an electrophoretic display.
Inventors
- 👤 Wei-Hsin Hou
- 👤 Thomas B. Lloyd
- 👤 Frederic E. Schubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:10
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04; G02; G02F; G02F1/00; G02F1/01; G02F1/165; G02F1/166; G02F1/167; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
85 words
A process for forming an electrophoretic fluid for use in an electrophoretic display, comprising: (a) providing a dielectric fluid; (b) preparing dielectric particles by polymerizing a monomer selected from the group consisting of vinyl halide monomers and vinyl monomers having the formula ##STR2## where X is selected from the group consisting of a halide, carboxyl, ether trialkylammonio, acetate, diazoniodialkylsulfonio, cyano, and oxyl imino, using dispersion polymerization and where n is selected as H or X; and (c) dispersing said dielectric particles in said dielectric fluid.
Claim 2
Dependent Claim
85 words
A process for forming an electrophoretic fluid for use in an electrophoretic display, comprising: (a) providing a dielectric fluid; (b) preparing dielectric particles by polymerizing a monomer selected from the group consisting of vinyl halide monomers and vinyl monomers having the formula ##STR2## where X is selected from the group consisting of a halide, carboxyl, ether trialkylammonio, acetate, diazoniodialkylsulfonio, cyano, and oxyl imino, using dispersion polymerization and where n is selected as H or X; and (c) dispersing said dielectric particles in said dielectric fluid.
Claim 3
Dependent Claim
63 words
The process of claim 1, wherein said step of polymerizing includes: (a) admixing said monomer and a crosslinker in a dispersion medium to form a first mixture; (b) preparing a second mixture of an initiator and a stabilizer; (c) adding said first mixture to said second mixture to form a third mixture and allowing said monomer to polymerize to form said dielectric particles.
Claim 4
Dependent Claim
42 words
The process of claim 2, further including the steps of centrifuging said third mixture to separate said dielectric particles from said dispersion medium and decanting the supernatant said dispersion medium prior to said step of dispersing said particles in said dielectric fluid.
Claim 5
Dependent Claim
50 words
The process of claim 3, further including the steps of resolvating said dielectric particles after centrifuging said third mixture with a solvent miscible with said dispersion medium and with said dielectric fluid and further centrifuging said particles and decanting said solvent prior to dispersing said particles in said dielectric fluid.
Claim 6
Dependent Claim
28 words
The process of claim 4, further including the step of adding a charge control agent to said dielectric fluid after said step of dispersing in said dielectric fluid.
Claim 7
Dependent Claim
20 words
The process of claim 5, wherein said charge control agent is an acidic surfactant and a negative charge control agent.
Claim 8
Dependent Claim
38 words
The process of claim 6, wherein said negative charge control agent is selected from the group consisting of polyisobutylene succinic anhydride, cuptic naphthenate, zirconium octoate, zinc octoate, calcium octoate, polyvinyl alcohol, polyacrylic acid, polymethacrylic acid and polyvinyl chloride.
Claim 9
Dependent Claim
20 words
The process of claim 5, wherein said charge control agent is a basic surfactant and a negative charge control agent.
Claim 10
Dependent Claim
40 words
The process of claim 8, wherein said negative charge control agent is selected form the group consisting of polyisobutylene succinimide, barium petronate, barium sulfonate, barium dinonylnaphthalensulfonate, polyvinyl pyridine, pyridine, lecithin, polyvinyl acetate, polyethylene oxide, polymethyl methacrylate, polyacrylamide, polyesters and polyethers.
Claim 11
Dependent Claim
21 words
The process of claim 5, further including adding a dye to said dielectric fluid when said charge control agent is added.
Claim 12
Dependent Claim
27 words
The process of claim 10, wherein said dye is selected from the group consisting of Solvent Blue, Oil Blue A, Sudan Black B, and Sudan Red 7B.
Claim 13
Dependent Claim
38 words
The process of claim 5, further including the step of adding a stabilizer to said dielectric fluid when said charge control agent is added, wherein said stabilizer retards the coagulation of said dielectric particles in said dielectric fluid.
Claim 14
Dependent Claim
20 words
The process of claim 12, wherein said stabilizer is selected from the group consisting of homopolymers, copolymers and block copolymers.
Claim 15
Dependent Claim
24 words
The process of claim 13, wherein said stabilizer is selected from the group consisting of poly(12-hydroxystearic acid)-graft-poly(methyl methacrylate-methacrylic acid), polystyrene-co-poly(vinyl pyridine) and poly(vinyl alcohol)-co-polyethylene.
Claim 16
Dependent Claim
13 words
The process of claim 5, wherein said dielectric fluid is a non-polar solvent.
Claim 17
Dependent Claim
27 words
The process of claim 15, wherein said dielectric fluid is selected from the group consisting of tetrachloroethylene, carbon tetrachloride, pentane, octane, decane, cyclohexane, benzene, xylene and coparaffinate.
Claim 18
Dependent Claim
20 words
The process of claim 16, wherein said solvent is selected from the group consisting of alcohols, ketones, ethers, and esters.
Claim 19
Dependent Claim
13 words
The process of claim 17, wherein said crosslinker includes a nonconjugated divinyl compound.
Claim 20
Dependent Claim
23 words
The process of claim 1, further including the step of coloring the dielectric particles by exposing the dielectric particles to a dehydrohalogenation reagent.
Claim 21
Dependent Claim
67 words
The process of claim 18, wherein said nonconjugated divinyl compound is selected from a group consisting of diacrylate compounds, and dimethacrylate compounds said initiator is selected from the group consisting of 2,2-azobisisobutyronitrile, 4,4'-azobis(4-cyanopentanoic acid), 2,2'-azobis(2-methy lbutyronitrile), benzoyl peroxide, lauroyl peroxide and octanoyl peroxide and said stabilizer is selected from the group consisting of poly(vinyl pyrrolidone), poly(vinyl methyl ether), polyethyleneimine, vinyl acetate copolymer, ethyl cellulose and hydroxypropyl cellulose.
References Cited (Backward Citations)
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