Process for preparing colored toner particles
First Claim
1. A process for the preparation of colored polymeric toner particles comprising:
- a) forming an organic phase by dissolving an organic polymer and, optionally, one or more additives in a water-immiscible organic solvent;
b) forming a dispersion by combining the organic phase with an aqueous phase comprising a particulate stabilizer, a colorant, and, optionally, a promoter, with the proviso that when the colorant is carbon black, said carbon black is an acidic carbon black having a pH less than 7;
c) homogenizing the dispersion, thereby forming droplets containing the organic solvent, organic polymer, and colorant;
d) removing the organic solvent from the droplets, thereby forming colored polymeric toner particles; and
e) separating and drying the colored polymeric toner particles.
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Abstract
A process for the preparation of colored polymeric toner particles includes: forming an organic phase by dissolving an organic polymer and, optionally, one or more additives in a water-immiscible organic solvent; forming a dispersion by combining the organic phase with an aqueous phase comprising a particulate stabilizer, a colorant, and, optionally, a promoter, with the proviso that when the colorant is carbon black, it is an acidic carbon black having a pH less than 7; homogenizing the dispersion to form droplets containing the organic solvent, organic polymer, and colorant; removing the organic solvent from the droplets to form colored polymeric toner particles; and separating and drying the toner particles.
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Citations
20 Claims
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1. A process for the preparation of colored polymeric toner particles comprising:
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a) forming an organic phase by dissolving an organic polymer and, optionally, one or more additives in a water-immiscible organic solvent;
b) forming a dispersion by combining the organic phase with an aqueous phase comprising a particulate stabilizer, a colorant, and, optionally, a promoter, with the proviso that when the colorant is carbon black, said carbon black is an acidic carbon black having a pH less than 7;
c) homogenizing the dispersion, thereby forming droplets containing the organic solvent, organic polymer, and colorant;
d) removing the organic solvent from the droplets, thereby forming colored polymeric toner particles; and
e) separating and drying the colored polymeric toner particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification