Abstract: A process is provided for preparing a polyester styrene vinyl hybrid polymer latex composition which may be used to prepare toner for use in electrographic applications by the emulsion aggregation process. The process includes preparing a polyester by polycondensation, preparing a solution of the polyester in a mixture of styrene and vinyl monomers, emulsifying the polyester/monomer solution, and polymerizing the emulsion via emulsion polymerization to yield a polyester styrene vinyl hybrid polymer latex composition. The latex affords excellent fixing when used in chemically produced toner made by the emulsion aggregation process.

Abstract: A process is provided for preparing a bimodal styrene vinyl polymer latex composition, which may be used to prepare toner for use in electrophotographic applications by the emulsion aggregation process. The process includes preparing a low molecular weight styrene polymer (LMWP) by solution polymerization, preparing a solution of the LMWP in a mixture of styrene and vinyl monomers, emulsifying the LMWP/monomer solution in water, and polymerizing the LMWP and mixture of styrene and vinyl monomers via emulsion polymerization to yield a bimodal molecular weight composition. The latex affords excellent fixing when used in chemically produced toners such as toners produced by emulsion aggregation.