Granted Patent B2

US 8,221,951 · App. 12/718,296 · Granted Jul 17, 2012

Abstract

Claims (16)

1. Toner particles, comprising a core and a shell, the core comprising an amorphous polyester resin, a crystalline polyester resin, and a cyanine dye,

wherein the cyanine dye is selected from the group consisting of

and wherein the shell comprises a same amorphous polyester resin as the core and a same cyanine dye as the core.

2. The toner particles of claim 1 , wherein the cyanine dye comprises about 0.01 to about 5 wt % of the toner particles.

3. The toner particles of claim 1 , wherein the cyanine dye is

4. The toner particles of claim 1 , wherein the toner particles have a GSD of less than or equal to about 1.30.

5. The toner particles of claim 1 , wherein the toner particles have an average particle size of from about 3.55 to about 9 um.

6. The toner particles of claim 1 , wherein the toner particles possess a parent toner charge per mass ratio of from about −3 μC/g to about −60 μC/g.

7. The toner particles of claim 1 , wherein the toner particles have an average particle circularity of from about 0.950 to about 0.980.

8. A method of making toner particles, the method comprising:

emulsifying an amorphous polyester resin, a crystalline polyester resin, a cyanine dye, an optional colorant, and an optional wax to form pre-aggregated particles, wherein the cyanine dye is selected from the group consisting of:

aggregating the pre-aggregated particles to form aggregated core particles;

forming a shell on the aggregated core particles, wherein the shell comprises a same amorphous polyester resin as the aggregated particles and a same cyanine dye as the aggregated particles;

coalescing the core-shell particles to form coalesced particles; and

isolating the coalesced particles.

9. The method of claim 8 , wherein the cyanine dye comprises about 0.01 to about 5 wt % of the toner particles.

Assignments (9)