Method of forming electrophotographic toner

• US 20070048654A1
• Filed: 08/26/2005
• Published: 03/01/2007
• Est. Priority Date: 08/26/2005
• Status: Active Grant

• Current Assignee: Sinonar Corporation
• Original Assignee: Sinonar Corporation
• Inventors: Hung, Chih-Chia, Liu, Ming-Huei, Hsu, Fang-Yi
• Granted Patent: US 7,666,565 B2
• Time in Patent Office: Days
• US Class Current: 430/137.140
• CPC Class Codes: G03G 9/0804 whereby the components are brought together in a liquid dispersing medium

Abstract

A method of forming electrophotographic toner. An organic solution containing a polymer resin and a solvent and an aqueous solution containing an anti-coagulant are provided. The aqueous solution is added into the organic solution to form colloidal polymer particles. The colloidal polymer particles are then aggregated, coalesced, and solidified to form toner particles.

Claims

1. A method of forming electrophotographic toner, comprising:

providing an organic solution containing a polymer resin and a solvent;

providing an aqueous solution containing an anti-coagulant; and

adding the aqueous solution into the organic solution to form colloidal polymer particles, aggregating, coalescing, and solidifying the colloidal polymer particles to form toner particles.

2. The method of forming electrophotographic toner as claimed in claim 1, wherein the polymer resin comprises polyamides, polyesters, acrylic resins, polystyrenes, epoxy resins, styrene-acrylate copolymers, polyolefins, polycarbonate, polyacrylamide, ethylene-vinyl acetate, polyvinyl acetate, polyurethane, polyvinyl butyral, or a mixture thereof.

3. The method of forming electrophotographic toner as claimed in claim 1, wherein the solvent comprises methanol, ethanol, n-propanol, iso-propanol, n-butanol, iso-butanol, tert-butanol, glycerol, methyl acetate, ethyl acetate, Propyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, butyl cellosolve, ethyl formate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, tetrahydrofuran, dioxane, dichloromethane, dichloroethane, chloroform, or a mixture thereof.

4. The method of forming electrophotographic toner as claimed in claim 1, wherein the solvent has solubility of about 0.01 g/1 g to water at least.

5. The method of forming electrophotographic toner as claimed in claim 1, wherein the organic solution further comprises a colorant, a release agent, or a charge control agent.

6. The method of forming electrophotographic toner as claimed in claim 5, wherein the release agent comprises silicon oil, paraffin, polyethylene wax, polypropylene wax, fatty acid wax, ester wax, long-chain alcohol, long-chain acid, animal wax, plant wax, synthetic wax, or a mixture thereof.

7. The method of forming electrophotographic toner as claimed in claim 1, wherein the anti-coagulant comprises water-soluble polymers, cationic, anionic, or non-ionic surfactants, inorganic oxide powders, or a mixture thereof.

8. The method of forming electrophotographic toner as claimed in claim 7, wherein the water-soluble polymer comprises polyvinyl alcohol, polyvinylpyrrolidone, methyl cellulose, ethyl cellulose, hyroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl ethyl cellulose, carboxymethyl cellulose and its salts, polyacrylic acid and its salts, polyacrylic amide, polystyrene sulfonate, acacia gum, copolymer of ethylene oxide and propylene oxide, or a mixture thereof.

9. The method of forming electrophotographic toner as claimed in claim 7, wherein the ionic surfactant comprises alkylsulfate, alkylsulfonate, alkylnaphthalene-sulfonate, fatty acid salt, alkylphosphate, alkylaminoate, or a mixture thereof.

10. The method of forming electrophotographic toner as claimed in claim 7, wherein the non-ionic surfactant comprises alkylpolyoxyethylene ether, alkylpolyphenol ethoxylate, alkylolamide, sorbitan ester, polyoxyethylene sorbitan ester, polyethylene oxide, polypropylene oxide, or a mixture thereof.

11. The method of forming electrophotographic toner as claimed in claim 1, wherein the toner particles are used in laser printers, copiers, multi-function office appliances, fax machines, or electrostatic image printers.