Emulsion aggregation toner having zinc salicylic acid charge control agent
View Patent ↗A toner for developing electrostatic images including emulsion aggregation toner particles with a styrene acrylate latex resin, at least one additive, at least one colorant, and a charge control agent comprising 3,5 di-tert-butylsalicyclic acid zinc salt.
1. A toner for developing electrostatic images wherein said toner comprises emulsion aggregation toner particles comprising a styrene acrylate latex resin, at least one additive, at least one colorant, and a charge control agent comprising 3,5 di-tert-butylsalicyclic acid zinc salt having a particle size of from about 50 to about 500 nanometers, wherein said toner particles further comprise a shell layer thereon.
2. A toner as in claim 1 , wherein said charge control agent has a particle size of from about 150 to about 250 nanometers.
3. A toner as in claim 2 , wherein said charge control agent has a particle size of from about 175 to about 275 nanometers.
4. A toner as in claim 1 , wherein said charge control agent is present in said toner in an amount of from about 0.1 to about 3 percent by weight of total solids.
5. A toner as in claim 4 , wherein said charge control agent is present in said toner in an amount of from about 0.3 to about 2 percent by weight of total solids.
6. A toner as in claim 1 , wherein said styrene acrylate latex resin is a styrene n-butyl acrylate copolymer.
7. A toner as in claim 1 , wherein said latex resin is present in said toner in an amount of from about 50 to about 80 percent by weight of total solids.
8. A toner as in claim 1 , wherein said charge control additive is present in both said toner and said shell.
9. A toner as in claim 1 , wherein said shell layer consists essentially of a styrene acrylate polymer.
10. A toner as in claim 9 , wherein said styrene acrylate latex resin is a styrene n-butyl acrylate copolymer.
11. A toner as in claim 1 , wherein said at least one additive is selected from the group consisting of silica, titania, zinc stearate, alumina, and mixtures thereof.
12. A toner as in claim 1 , further comprising a wax selected from the group consisting of polyethylene, polypropylene wax, paraffin wax, Montan wax, Fischer Tropsch wax, and mixtures thereof.
13. A toner as in claim 1 , wherein the toner particles have circularity of from about 0.960 to about 0.980.
14. A toner as in claim 1 , wherein said toner has a toner tribo of from about 15 to about 35 uC/gm.
15. A toner as in claim 1 , wherein said toner has a tribo increase of from about 20 to about 30 units.
16. A toner as in claim 1 , wherein said toner has a gloss of from about 10 to about 80 ggu.
17. A set of toners for developing electrostatic images comprising a set of primary color toners comprising cyan toner, a magenta toner, yellow toner, and black toner, wherein each of said cyan toner, magenta toner, yellow toner and black toner comprise emulsion aggregation toner particles comprising a styrene acrylate latex resin, at least one additive, at least one colorant, and a charge control agent comprising 3,5 di-tert-butylsalicyclic acid zinc salt having a particle size of from about 50 to about 500 nanometers, wherein said toner particles further comprise a shell layer thereon.
18. A set of toners as in claim 17 , further comprising a set of secondary color toners comprising at least one of orange toner, red toner, green toner, brown toner, white toner, and blue toner.
19. The toner of claim 6 , wherein the resin further comprises β-carboxyethylacrylate.