Back to results
US 7,459,258 B2Granted
Toner processes
AssigneeXerox Corporation
InventorsJoo T. Chung, Chieh-Min Cheng, Hui Chang
Life of this patent
Estimating the term…
Abstract
Processes for continuously forming latex emulsions and preparing toners with said emulsions are provided.
Claims19
A process for producing toner in a single reaction vessel comprising an aggregation zone, a coalescence zone and a washing zone, said process comprising:
- aggregating a colorant and latex emulsion for a period of time of from about 1 minute to about 5 minutes to form aggregated toner particles in an aggregation zone of the single reaction vessel;
- coalescing the aggregated toner particles for a period of time of from about 0.5 minutes to about 2 minutes in a coalescence zone of the single reaction vessel to form aggregated and coalesced toner particles;
- and
- washing the aggregated and coalesced toner particles for a period of time of from about 1 minute to about 5 minutes in a washing zone of the single reaction vessel, thereby forming toner.
1 more element
A process comprising:
- preparing an emulsion comprising at least one monomer, water, an optional surfactant and an optional seed resin in a single reaction vessel;
- maintaining the emulsion under polymerization conditions for a period of time of from about 0.5 minutes to about 10 minutes to provide a latex emulsion containing latex particles;
- and
- continuously recovering the latex emulsion.
1 more element
A process comprising
- preparing an emulsion comprising at least one monomer, water, an optional surfactant and an optional seed resin in a single reaction vessel;
- maintaining the emulsion under polymerization conditions to provide a latex emulsion containing latex particles;
- continuously recovering the latex emulsion;
- contacting the latex emulsion and a colorant;
- aggregating the colorant and latex emulsion to form aggregated toner particles, coalescing the aggregated toner particles, and washing the aggregated and coalesced toner particles by sequentially advancing the colorant and latex emulsion through a multi-screw extruder defining an aggregation zone for a period of time of from about 1 minute to about 5 minutes, a coalescence zone for a period of time of from about 0.5 minutes to about 2 minutes, and a washing zone for a period of time of from about 1 minute to about 5 minutes.
2 more elements
Dependencies are inferred from the claim text.