Toner processes

• US 7,029,817 B2
• Filed: 02/13/2004
• Issued: 04/18/2006
• Est. Priority Date: 02/13/2004
• Status: Expired due to Fees

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Sacripante, Guerino G., Hawkins, Michael S., Liebermann, George, Enright, Thomas E., Saban, Marko D., Robinson, Sarah J. P., Maric, Milan, Toth, Alan E. J.
• Primary Examiner(s): Chapman, Mark A.
• Application Number:
  US10/778,557
• Publication Number:
  US 20050181296A1
• Time in Patent Office: 795 Days
• Field of Search: 430/137.14, 430/109.4
• US Class Current: 430/137.14
• CPC Class Codes: C08J 2367/00 Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
• CPC Class Codes: C08J 3/16 by coagulating dispersions C08J3/122 takes precedence
• CPC Class Codes: C08J 3/215 at least one additive being also premixed with a liquid phase
• CPC Class Codes: G03G 9/0804 whereby the components are brought together in a liquid dispersing medium
• CPC Class Codes: G03G 9/0819 characterised by the dimensions of the particles
• CPC Class Codes: G03G 9/0823 Electric parameters
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08782 Waxes
• CPC Class Codes: G03G 9/08791 characterised by the presence of specified groups or side chains
• CPC Class Codes: G03G 9/08795 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
• CPC Class Codes: G03G 9/09708 Inorganic compounds
• CPC Class Codes: G03G 9/09725 Silicon-oxides; Silicates
• CPC Class Codes: G03G 9/09783 Organo-metallic compounds
• CPC Class Codes: G03G 9/09791 Metallic soaps of higher carboxylic acids

Abstract

A toner process comprising the aggregation and coalescence of a sulfonated polyester and a colorant, and wherein said polyester possesses a degree of sulfonation or a sulfonation percentage of from about 0.5 to about 3 mol percent.

Claims

1. A process for the preparation of toner which comprises the heating of a sulfonated polyester and a colorant, and wherein said polyester possesses a sulfonation percentage of from about 0.5 to about 3 mol percent, and wherein said heating is accomplished by heating in sequence said polyester and colorant at a first temperature about below the glass transition temperature of said polyester, followed by second subsequent second heating at about above the glass transition of said polyester, and wherein aggregation/coalescence of said polyester and said colorant results, and which process is accomplished by solvent flashing.

2. A process in accordance with claim 1 wherein the colorant is a pigment.

3. A process in a accordance with claim 1 wherein the colorant is a dye.

4. A process in accordance with claim 1 wherein said mol percent is from about 1.5 to about 3.

5. A process in accordance with claim 1 wherein said mol percent is from about 1 to about 2.8.

6. A process in accordance with claim 1 wherein said mol percent is less than about 3.

7. A process in accordance with claim 1 wherein said mol percent is from about 1 to about 2.

8. A process in accordance with claim 1 wherein said first heating is at a temperature of from about 50°

C. to about 70°

C., and which heating enables aggregation of said polyester and said colorant.

9. A process in accordance with claim 1 wherein said first heating is at a temperature of from about 45°

C. to about 55°

C., and which heating enables aggregation of said polyester and said colorant.

10. A process in accordance with claim 1 wherein there is further included a wax component.

11. A process in accordance with claim 10 wherein said wax is a polypropylene.

12. A process in accordance with claim 10 wherein said wax is polyethylene.

13. A process in accordance with claim 10 wherein said wax is comprised of a mixture of polyethylene and polypropylene.

14. A process in accordance with claim 10 wherein said wax possesses a molecular weight average M_w of from about 1,500 to about 20,000.

15. A process in accordance with claim 10 wherein said wax possesses a low molecular weight average M_w of from about 3,500 to about 10,000, or a low molecular weight average M_w of from about 4,000 to about 7,000.

16. A process in accordance with claim 1 wherein an emulsion is prepared by dissolving said sulfonated polyester in a suitable solvent, adding thereto hot water to exit the solvent thereby resulting in a mixture of said polyester in water.

17. A process in accordance with claim 16 wherein said solvent is an organic solvent.

18. A process in accordance with claim 16 wherein said solvent is acetone.

19. A process in accordance with claim 16 wherein said solvent is methyl ethyl ketane, ethyl acetate, toluene, methyl isobutyl ketone, or tetrahydrofuran.

20. A process in accordance with claim 16 wherein said solvent is selected in an amount of from about 85 to about 95 weight percent, and said polyester is selected in an amount of from about 35 to about 5 weight percent and wherein the total thereof is about 100 percent.

21. A process in accordance with claim 16 wherein said hot is from about 70°

C. to about 90°

C., or wherein said hot is from about 75°

C. to about 84°

C.

22. A process in accordance with claim 1 wherein said polyester is poly(1,2-propylene-sodio 5-sulfoisophthalate), poly(neopentylene-sodio 5-sulfoisophthalate), poly(diethylene-sodio 5-sulfoisophthalate), copoly(1,2-propylene-sodio 5-sulfoisophthalate)-copoly-(1,2-propylene-terephthalate phthalate), copoly(1,2-propylene-diethylene sodio 5-sulfoisophthalate)-copoly-(1,2-propylene-diethylene-terephthalatephthalate), copoly(ethylene-neopentylene-sodio 5-sulfoisophthalate)-copoly-(ethylene-neopentylene-terephthalate-phthalate), or copoly(propoxylated bisphenol A)-copoly-(propoxylated bisphenol A-sodio 5-sulfoisophthalate.

23. A process in accordance with claim 1 wherein said polyester is copoly(1,2-propylene-diethylene sodio 5-sulfoisophthalate)-copoly-(1,2-propylene-diethylene-terephthalatephthalate), or copoly(1,2-propylene-diethylene)terephthalate-copoly(sodium sulfoisophthalate dicarboxylate).

24. A process in accordance with claim 1 wherein

(i) said sulfonated polyester is dispersed in water, which water is at a temperature of from about 50°

C. to about 95°

C.;

(ii) accomplishing an initial aggregation of the dispersed sulfonated polyester particles to submicron particles of from about 50 to about 200 nanometers in diameter by the addition of a solution containing a monocationic salt, a dicationic salt, or an electrolyte solution;

(iii) adding a colorant dispersion with from about 20 to about 50 weight percent of predispersed colorant in water with a colorant mean particle size of from about 50 to about 150 nanometers, and which dispersion is further diluted with deionized water, and controlling the aggregation rate by the dropwise addition of said salt, or said electrolyte, and then heating near the aggregation temperature of from about 40°

C. to about 60°

C. until toner sized aggregates are obtained as monitored by both optical microscopy and Coulter Counter particle size measurements, cooling; and

(iv) recovering said toner composition, or said toner particles;

(v) drying said toner particles; and

(vi) optionally adding to said dry toner particles of toner resin and colorant, wax, charge additives, and surface flow additives.

25. A process in accordance with claim 1 wherein the colorant is a cyan, black, a magenta, yellow dispersion or mixtures thereof.

26. A process in accordance with claim 1 wherein the sulfonated polyester is in the form of a dispersion comprised of from about 5 to about 30 weight percent solids, and the colorant dispersion contains from about 20 to about 50 weight percent of colorant, and wherein the toner particle size diameter is from about 3 to about 12 microns in volume average diameter.

27. A process in accordance with claim 1 wherein said toner is isolated, filtered, washed with water, and dried.

28. A process in accordance with claim 1 wherein there is added to the surface of the formed toner of sulfonated polyester and colorant, metal salts, metal salts of fatty acids, silicas, metal oxides, or mixtures thereof, each in an amount of from about 0.1 to about 7 weight percent of the obtained toner.

29. A toner process comprising heating and solvent flashing a sulfonated polyester, colorant, and optional wax, and wherein said polyester possesses a sulfonation percentage of from about 0.5 to about 3 mol percent, and wherein said heating is accomplished by heating in sequence said polyester and colorant at a first temperature about below the glass transition temperature of said polyester, followed by second subsequent second heating at about above the glass transition of said polyester, and wherein aggregation/coalescence of said polyester and said colorant results.