Toner compositions comprising crystalline polyester and wax

Patent metadata

Field	Value
Publication number	US-9864291-B1
Application number	US-201615187475-A
Country	US
Kind code	B1
Filing date	Jun 20, 2016
Priority date	Jun 20, 2016
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A hybrid toner includes a core having at least one amorphous polyester resin and at least one crystalline polyester resin, and at least one styrene/acrylate resin, a shell comprising at least one styrene/acrylate resin, at least one wax, and optionally a pigment dispersion, the first modulated differential calorimetry scan of the hybrid toner shows at least two melting point peaks below about 80° C., and the difference between the two melting point peaks is less than or equal to about 15° C.

First claim

What is claimed is:

1. A hybrid toner comprising:
a core comprising at least one amorphous polyester resin and at least one crystalline polyester resin, and at least one styrene/acrylate resin;
a shell comprising at least one styrene/acrylate resin;
at least one wax; and a pigment dispersion comprising a pigment and a dispersant;
wherein the first modulated differential calorimetry scan of the hybrid toner shows at least two melting point peaks below about 80° C., and wherein the difference between the two melting point peaks is less than or equal to about 15° C.; wherein the pigment dispersion comprises a carbon black, a sodium dodecyl benzene sulfonate and a sulphonate formaldehyde condensate, and wherein the toner exhibits a dielectric loss less than about 65.

2. The hybrid toner of claim 1 , wherein the toner further comprises a polymeric sulfonate surfactant.

3. The hybrid toner of claim 1 , wherein the wax is a paraffin wax and is in the core, the shell, or both, the wax having a peak melting point less than about 80° C., and an onset of melting greater than or equal to about 50° C.

4. The hybrid toner of claim 1 , where the wax is a polyethylene or polymethylene wax and is in the core, the shell, or both, the wax having a peak melting point less than about 80° C., and an onset of melting greater than or equal to about 50° C.

5. The hybrid toner of claim 1 , wherein the crystalline polyester has a melting point less than or equal to about 80° C. and an onset of melting greater than or equal to about 50° C.

6. The hybrid toner of claim 1 , wherein the difference between the wax melting point and the crystalline polyester is less than or equal to about 15° C.

7. The hybrid toner of claim 1 , wherein the styrene acrylate resin has an onset T g in the second heat DSC scan from about 50° C. to about 56° C.

8. The hybrid toner of claim 1 , wherein the crystalline polyester comprises a C12 diacid and a C6 diol.

9. The hybrid toner of claim 1 , wherein the polyester comprises a C12 diacid and a C9 diol.

10. The hybrid toner of claim 1 , wherein the carbon black pigment has a carbon content of greater than or equal to about 99.5 atom percent.

11. A hybrid toner comprising:
a core comprising a crystalline polyester resin, an amorphous polyester resin and a styrene/acrylate resin;
a shell comprising a styrene/acrylate resin;
a wax disposed within the shell, the core or both; and
a pigment dispersion comprising a pigment and a dispersant, wherein the pigment dispersion comprises a sodium dodecyl benzene sulfonate and a sulphonate formaldehyde condensate;
wherein the difference between the wax melting point and the crystalline polyester melting point is less than or equal to about 15° C., and further wherein the toner exhibits a dielectric loss less than about 65.

12. The hybrid toner of claim 11 , wherein the toner further comprises a polymeric sulfonate surfactant.

13. The hybrid toner of claim 11 , wherein the wax is in the core, the shell, or both, the wax having a peak melting point less than about 80° C.

14. The hybrid toner of claim 11 , wherein the wax has an onset of melting greater than or equal to about 50° C.

15. The hybrid toner of claim 11 , wherein the crystalline polyester has a melting point less than or equal to about 80° C.

16. The hybrid toner of claim 11 , wherein the styrene acrylate resin has a second onset T g from about 50° C. to about 56° C.

17. The hybrid toner of claim 11 , wherein the polyester comprises a C12 diacid condensed with a C6 or C9 diol.

18. The hybrid toner of claim 11 , wherein the pigment dispersion comprises a carbon black pigment in a non-polymeric sulfonate surfactant, wherein a purity of the carbon black pigment is greater than about 99.5 atom percent carbon.

19. A hybrid toner comprising:
a core comprising a crystalline polyester resin, an amorphous polyester resin and a styrene/acrylate resin;
a shell comprising a styrene/acrylate resin;
a paraffin wax disposed within the shell, the core or both; and
a dispersion of a carbon black pigment in a non-polymeric sulfonate surfactant, wherein a purity of the carbon black pigment is greater than about 99.5 atom percent carbon, wherein the dispersion comprises a sodium dodecyl benzene sulfonate and a sulphonate formaldehyde condensate;
wherein the paraffin wax is in the core, the shell, or both, the wax having a peak melting point less than about 80° C.;
wherein the paraffin wax has an onset of melting greater than or equal to about 50° C.;
wherein the crystalline polyester has a melting point less than or equal to about 80° C.;
wherein the difference between the paraffin wax melting point and the crystalline polyester is less than or equal to about 15° C.;
wherein the styrene acrylate resin has a second onset T g from about 50° C. to about 56° C.; and

wherein the toner exhibits a dielectric loss less than about 65.

Assignees

• Xerox Corp

Inventors

• Veregin Richard P N
• Farrugia Valerie M
• Lee Frank Ping-Hay
• D'Amato Michael J
• Hawkins Michael S
• Zwartz Edward G
• Wang Yulin
• Sheik-Qasim Abdisamed
• Gardner Sandra J

Classifications

• G03G9/08755

  Polyesters · CPC title

• G03G9/0821

  characterised by physical parameters (magnetic parameters G03G9/083) · CPC title

• G03G9/09321

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/09364

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/09371 Primary

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title