TONER COMPOSITIONS AND PROCESSES

• US 20120052433A1
• Filed: 08/26/2010
• Published: 03/01/2012
• Est. Priority Date: 08/26/2010
• Status: Active Grant

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Chen, Allan K., Faucher, Santiago, Zwartz, Edward Graham, Nosella, Kimberly D., Vanbesien, Daryl W.
• Granted Patent: US 8,574,804 B2
• Time in Patent Office: Days
• US Class Current: 430/108.4
• CPC Class Codes: G03G 9/0821 characterised by physical parameters magnetic parameters G03G9/083
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/08782 Waxes
• CPC Class Codes: G03G 9/08795 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants
• CPC Class Codes: G03G 9/08797 characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature
• CPC Class Codes: G03G 9/09364 obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: G03G 9/09371 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: G03G 9/09378 Non-macromolecular organic compounds
• CPC Class Codes: G03G 9/09385 Inorganic compounds
• CPC Class Codes: G03G 9/09392 Preparation thereof

Abstract

Toners are provided, which possess low melt properties capable of producing a low gloss finish. The toners include a core and a shell. The shell includes a crystalline resin. The core may include at least one amorphous resin, an optional crystalline resin, an optional wax, and an optional colorant.

Claims

1. A toner comprising particles comprising:

a core comprising at least one amorphous polyester resin, an optional crystalline resin, a colorant, and an optional wax; and

a shell comprising at least one amorphous resin in combination with at least one crystalline resin, the at least one crystalline resin being present in an amount of from about 1% to about 50% by weight of the shell,

wherein the toner has a gloss of from about 25 ggu to about 85 ggu.

2. The toner according to claim 1, wherein the at least one amorphous polyester resin comprises an alkoxylated bisphenol A fumarate/terephthalate based polyester or copolyester resin.

3. The toner according to claim 1, wherein the crystalline resin is of the formula:

4. The toner according to claim 1, wherein the core comprises a second amorphous resin.

5. The toner according to claim 1, wherein the shell comprises from about 50% to about 90% by weight of at least one amorphous resin.

6. The toner according to claim 1, wherein the core further comprises a wax, the wax being present in an amount of from about 1% to about 24% by weight of the toner.

7. The toner according to claim 6, wherein the wax is selected from the group consisting of polyethylene wax, polypropylene wax, polybutene wax, sumacs wax, jojoba oil, beeswax, montan wax, ozokerite, ceresin, paraffin wax, microcrystalline wax, Fischer-Tropsch wax, stearyl stearate, behenyl behenate, butyl stearate, propyl oleate, glyceride monostearate, glyceride distearate, pentaerythritol tetra behenate;

diethyleneglycol monostearate, dipropyleneglycol distearate, and combinations thereof, and wherein the wax is present in an amount of from about 3 percent to about 10 percent by weight of the toner.

8. The toner according to claim 1, wherein the crystalline resin is present in an amount from about 10% to about 50% by weight of the shell.

9. The toner according to claim 1, wherein the toner has a gloss of from about 35 ggu to about 75 ggu, and a minimum fixing temperature of from about 120°

C. to about 160°

C.

10. A toner comprising particles comprising:

a core comprising at least one amorphous polyester resin, an optional crystalline polyester resin, at least one wax, and a colorant; and

a shell comprising at least one amorphous resin in combination with at least one crystalline resin, the at least one crystalline resin being present in an amount of from about 1% to about 50% by weight of the shell,

wherein the toner has a gloss of from about 35 ggu to about 75 ggu.

11. The toner according to claim 10, wherein the at least one amorphous polyester resin comprises an alkoxylated bisphenol A fumarate/terephthalate based polyester or copolyester resin.

12. The toner according to claim 10, wherein the crystalline polyester resin is of the formula:

13. The toner according to claim 10, wherein the at least one amorphous polyester resin is present in an amount from about 50% to about 90% by weight of the shell, and wherein the crystalline polyester resin is present in the shell in an amount of from about 10% to about 50% by weight of the shell.

14. The toner according to claim 10, wherein the wax is present in an amount of from about 3 percent to about 10 percent by weight of the toner.

15. The toner according to claim 10, wherein the toner has a minimum fixing temperature of from about 120°

C. to about 160°

C.

16. A toner comprising:

a core comprising at least one amorphous polyester resin, from about 1% to about 24% by weight of at least one wax, and at least one colorant; and

a shell comprising from about 50% to about 90% by weight of at least one amorphous polyester resin, and from about 10% to about 50% of at least one crystalline resin,

wherein the toner has a gloss from about 25 ggu to about 85 ggu.

17. The toner according to claim 16, wherein the shell comprises from about 60% to about 80% by weight of the at least one amorphous resin and from about 20% to about 40% of the crystalline resin.

18. The toner according to claim 16, wherein the wax is present in an amount of from about 3 percent to about 10 percent by weight of the toner.

19. The toner according to claim 16, wherein the crystalline resin comprises a crystalline resin of the formula:

20. The toner according to claim 16, wherein the toner has a minimum fixing temperature of from about 120°

C. to about 160°

C.