Method of forming electrophotographic toner

• US 7,666,565 B2
• Filed: 08/26/2005
• Issued: 02/23/2010
• Est. Priority Date: 08/26/2005
• Status: Expired due to Fees

• Current Assignee: Sinonar Corporation
• Original Assignee: Sinonar Corporation
• Inventors: Hung, Chih-Chia, Liu, Ming-Huei, Hsu, Fang-Yi
• Primary Examiner(s): Huff; Mark F
• Assistant Examiner(s): ZHANG, RACHEL L
• Application Number:
  US11/211,719
• Publication Number:
  US 20070048654A1
• Time in Patent Office: 1,642 Days
• Field of Search: 430/108.1, 430/137.14, 523/333, 523/335
• US Class Current: 430/137.14
• 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, wherein the solvent has a solubility of about 0.04 to 1 g/1g to water;

providing an aqueous solution containing an anti-coagulant, wherein the anti-coagulant is present in an amount of 0.1-30 wt% of the aqueous solution, and the aqueous solution is 0.5 to 10 times the amount of the organic solution;

adding the aqueous solution into the organic solution during 0-120 minutes to form a mixture solution containing colloidal polymer particles;

agitating the mixture solution with an agitation speed of 400-3000 rpm during 1-240 minutes to aggregate and coalesce the colloidal polymer particles and remove the solvent without heating to solidify the aggregated and coalesced 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 organic solution further comprises a colorant, a release agent, or a charge control agent.

4. The method of forming electrophotographic toner as claimed in claim 3, 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.

5. 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.

6. The method of forming electrophotographic toner as claimed in claim 5, 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.

7. The method of forming electrophotographic toner as claimed in claim 5, wherein the ionic surfactant comprises alkylsulfate, alkylsulfonate, alkylnaphthalene-sulfonate, fatty acid salt, alkylphosphate, alkylaminoate, or a mixture thereof.

8. The method of forming electrophotographic toner as claimed in claim 5, wherein the non-ionic surfactant comprises alkylpolyoxyethylene ether, alkylpolyphenol ethoxylate, alkylolamide, sorbitan ester, polyoxyethylene sorbitan ester, polyethylene oxide, polypropylene oxide, or a mixture thereof.

9. 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.