Xerox Corporation

Eric David Godshall

Steven M Malachowski

Chieh-Min Cheng

Joo T Chung

Eric Joseph Young

Brian Joseph Marion

Shigang S Qiu

Peter J Schmitt

Peter Van Nguyen

Shigeng Li

Christopher M Wolfe

Jay Lee Schneider

Amy Avolia Grillo

Matthew M Storey

Edmund T Varga

Linda S Schriever

Randy Pheav Tin

Daniel Mcdougall Mcneil

Linda Jan

David R Earle

Michael P Dugan

Jim Lee Pearson

Disclosed is a method, apparatus and system of drying wet toner particles which includes the use of cooling fluid. The method also includes introducing a heated drying gas into a toner drying chamber to create a circulating flow of drying gas.

Method, apparatus and system for fluid cooling of toner dryer

Processes for continuously coalescing particles from an aggregated particle slurry are disclosed. The aggregated particle slurry is heated, then coalesced by raising the pH. The coalesced particles are homogenized and exit as a coalesced particle slurry. A multi-screw extruder is used for the coalescing. These processes are useful for providing coalesced particles such as toner compositions.

Continuous coalescence processes

In an exemplary embodiment of the invention, a continuous process for rounding conventional toner particles includes forming a conventional toner particle slurry by mixing a dispersant and/or a liquid with dry toner particles, heating the conventional toner particle slurry to a first temperature beyond its glass transition temperature to form a coalesced toner particle slurry, quenching the coalesced toner particle slurry to a second temperature below the glass transition temperature after a residence time has elapsed, and recovering the quenched particle slurry at an outlet wherein the circularity of the conventional toner particles in the quenched toner particle slurry is from approximately 0.940 to 0.999 and the time frame for the heating, quenching and recovering steps is less than 20 minutes. An apparatus for practicing the novel continuous coalescence of toner particles, includes an inlet passage, a first heat exchanger coupled to the inlet passage, a residence time coil coupled to the first heat exchanger, a cooling device coupled to the residence time coil; and an outlet passage coupled to the cooling device.

System and method for conventional particle rounding utilizing continuous emulsion-aggregation (EA) technology

A process for making a latex emulsion where distillation occurs at an elevated temperature is used to make resin particles with a conditioned surface which can be used to make magenta toner with increased efficiency.

Magenta toner

A continuous process for making a pigment dispersion includes continuously feeding a pigment into a feed section of a screw extruder at a controlled rate, continuously feeding a surfactant into the feed section of the screw extruder at a controlled rate, continuously feeding water downstream of the feed section to emulsify the pigment and the surfactant, forming a water-in-pigment dispersion, continuously feeding additional water downstream of the previously fed water to cause a phase inversion of the water-in-pigment dispersion, forming a pigment-in-water dispersion, continuously homogenizing the pigment-in-water dispersion in the screw extruder to create a homogenous aqueous pigment dispersion and collecting the homogenous aqueous pigment dispersion from an exit section of the screw extruder.

Method of continuously forming an aqueous colorant dispersion using a screw extruder

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Macedon, NY, United States of America

Eric David Godshall