Patent ID: 7704665

Claim:
A method of forming emulsion aggregation toner particles for a single component development system comprising: a) contacting a styrene acrylate polymer binder resin having a weight average molecular weight (Mw) of from about 50,000 to about 100,000 Daltons, and a number average molecular weight (Mn) of from about 10,000 to about 30,000 Daltons, a wax selected from the group consisting of polypropylene and polyethylene, and at least one colorant to produce a toner blend, b) aggregating the blend by heating at a temperature at or above the glass transition temperature of the styrene acrylate polymer binder residue to form an aggregated toner core; c) adding a second polymer binder resin to the aggregated toner core to form a shell over said toner core thereby forming a core-shell toner; d) growing said core-shell toner to a desired size; e) coalescing the core-shell toner by heating at a temperature above the glass transition temperature of the second latex; and f) recovering toner particles, wherein the toner particles have an onset glass transition temperature of from about 50° C. to about 60° C., and a circularity of from about 0.950 to about 0.990.