Preparing amorphous polyester resin emulsions

Patent metadata

Field	Value
Publication number	US-9348248-B2
Application number	US-201414578508-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Jan 15, 2013
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A process for making a latex emulsion including contacting at least one amorphous polyester resin with at least two organic solvents to form a resin mixture, adding a neutralizing agent, and deionized water to the resin mixture, removing the solvent from the formed latex, and separating the solvent from water. Further, the process is carried out above the resin Tg for making the latex, which drives the latex particle size under 100 nm, where toners made from the latex show improved charging performance.

First claim

We claim:

1. A toner particle comprising a resin particle comprising a high molecular weight amorphous resin less than 90 nm in size and a low molecular weight amorphous resin less than 90 nm in size, an optional colorant and an optional wax, wherein said toner particle has lower dielectric loss than a comparable toner particle comprising a resin particle greater than 100 nm in size.

2. The toner particle of claim 1 , further comprising a crystalline resin.

3. The toner particle of claim 1 , wherein said colorant comprises at least 7.5 wt % of said toner particle.

4. The toner particle of claim 1 , wherein said colorant comprises a black colorant.

5. The toner particle of claim 1 , comprising a low molecular weight amorphous resin having a molecular weight of from about 10,000 to about 30,000.

6. The toner particle of claim 1 , comprising a high molecular weight amorphous resin having a molecular weight of from about 35,000 to about 150.000.

7. The toner particle of claim 1 , comprising an ultra low melt toner.

8. The tone particle of claim 1 , comprising about 75 wt % amorphous resin.

9. The toner particle of claim 1 , comprising a minimum fix temperature of from about 100° C. to about 130° C.

10. The toner particle of claim 1 , comprising a hyperpigmented toner.

11. The toner particle of claim 1 , comprising a wax in an amount from about 1% by weight to about 25% by weight of the particle.

12. The toner particle of claim 1 , comprising a shell.

13. The toner particle of claim 12 , wherein said shell comprises a resin particle less than 100 nm in size.

Assignees

• Xerox Corp

Inventors

• Qiu Shigang
• Veregin Richard P N
• Nosella Kimberly D
• Faucher Santiago
• Vong Cuong
• Agur Enno E

Classifications

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• G03G9/0802

  Preparation methods · CPC title

• G03G9/0804

  whereby the components are brought together in a liquid dispersing medium · CPC title

• G03G9/0823

  Electric parameters · CPC title

• G03G9/08795

  characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants · CPC title