Emulsion/aggregation based toners containing a novel latex resin
View Patent ↗A toner is disclosed that includes a toner binder of a styrene/acrylate resin containing carboxylic acid substituents and epoxy substituents, and optionally a colorant and/or wax. The carboxylic acid substituents act as a curing agent and react with the epoxy substituents, causing rapid crosslinking of the toner. Curing occurs during the fusing process and at a temperature greater than 100° C.
1. A toner comprised of toner particles, wherein the toner particles are comprised of a binder that includes at least one resin, a colorant and a wax, wherein a carboxylic acid substituent and an epoxy substituent are together in a same structure of the at least one resin, and the at least one resin is substantially non-crosslinked prior to fusing.
2. The toner according to claim 1 , wherein the binder further includes a curing agent therein.
3. The toner according to claim 1 , wherein the at least one resin is derived from the addition polymerization of a mixture of olefinic monomers comprised of:
styrene;
alkyl acrylate and/or alkyl methacrylate;
acrylic acid, methacrylic acid and/or β-carboxyethylacrylate; and
glycidyl acrylate and/or glycidyl methacrylate.
4. The toner according to claim 1 , wherein the carboxylic acid substituent is derived from an acrylic acid, methacrylic acid and/or β-carboxyethylacrylate.
5. The toner according to claim 1 , wherein the epoxy substituent is derived from a glycidyl acrylate and/or a glycidyl methacrylate.
6. The toner according to claim 1 , wherein the at least one resin has a crosslinking temperature greater than 100° C.
7. The toner according to claim 3 , wherein the styrene is about 65 to about 85 weight percent of the binder resin and the alkyl acrylate and/or alkyl methacrylate is about 15 to about 35 weight percent of the at least one resin.
8. The toner according to claim 3 , wherein the acrylic acid, β-carboxyethylacrylate and/or methacrylic acid is about 1 to about 10 weight percent of the at least one resin.
9. The toner according to claim 3 , wherein the glycidyl acrylate and/or glycidyl methacrylate is about 4 to about 30 weight percent of the at least one resin.
10. The toner according to claim 1 , wherein the colorant is about 3 to 15 percent and the wax is about 3 to 30 percent, wherein all components in the binder are equal to 100 percent.
11. The toner according to claim 1 , wherein the colorant is a pigment.
12. The toner according to claim 1 , wherein the colorant is carbon black, cyan, yellow, magenta, or mixtures thereof, and the toner isolated is from about 2 to about 25 microns in volume average diameter, and the particle size distribution thereof is from about 1.15 to about 1.30.
13. A xerographic device for producing an image via application of the toner according to claim 1 to an image recording medium.
14. A method comprising:
forming an emulsion comprising styrene, acrylate, a source for epoxy substituents, and a source for carboxylic acid substituents;
forming a mixture by adding a colorant and a wax to the emulsion;
homogenizing the mixture;
adding an aggregating agent to the mixture and aggregating the mixture to form aggregated toner particles; and
coalescing the aggregated toner particles to form coalesced toner particles having a binder that includes at least one resin, wherein a carboxylic acid substituent and an epoxy substituent are together in a same structure of the at least one resin of the binder, and wherein the at least one resin is substantially non-crosslinked prior to fusing.
15. The method according to claim 14 , wherein the styrene is about 65 to about 85 weight percent of the emulsion, and the acrylate is about 15 to about 35 weight percent of the emulsion.
16. The method according to claim 14 , wherein the source for the epoxy substituent is a glycidyl acrylate monomer and/or a glycidyl methacrylate monomer, and wherein the source for the carboxylic acid substituent is an acrylic acid monomer, methacrylic acid monomer and/or a β-carboxyethylacrylate monomer.
17. The method according to claim 14 , wherein crosslinking occurs at a temperature greater than about 100° C.
18. A process for forming an image on an image recording medium, comprising:
applying the toner according to claim 1 to an image recording medium to form an image,
fusing the toner on the image recording medium, wherein the fusing causes crosslinking of the toner binder; and
whereby the image is fixed on the image recording medium.
19. The process according to claim 18 , wherein the fusing temperature is greater than about 100° C.
20. A toner comprised of toner particles, wherein the toner particles are comprised of a binder that includes at least one resin, a colorant and a wax,
wherein a carboxylic acid substituent and an epoxy substituent are together in a same structure of the at least one resin,
wherein the at least one resin is substantially non-crosslinked prior to fusing, and
wherein the at least one resin has the general formula:
wherein R is a mixture of phenyl and carboxy-alkylate substituent, R′ is a hydrogen or methyl substituent, and R″ is a hydrogen or ethylcarboxylic acid substituent, and m, n and o represent an amount of segmental units of the resin that are randomly distributed within the resin, wherein the m is from about 60 to 95 units based on 100 total units, n is from about 4 to 30 units based on 100 total units and o is from about 1 to 10 units based on 100 total units.