Patent ID: 6416921
Filing Date: 2002-07-09
Classification: G03G

Abstract:
A process for forming non-spherical toner particles by limited coalescence, said process comprising:forming an organic phase comprising a polymeric material, a pigment, a quaternary ammonium tetraphenylborate salt, a phosphonium salt polymer formed by condensation of at least one dicarboxylic acid or dicarboxylic ester monomer with at least one diol monomer, at least one of said acid or ester monomers including a triarylphosphonium salt group, and a water-immiscible liquid; dispersing said organic phase in an aqueous phase containing a solid colloidal stabilizer; forming a suspension of small droplets of said organic phase in said aqueous phase by high shear agitation; removing said water-immiscible liquid from said small droplets, thereby forming a suspension of small solid particles in said aqueous phase; and separating said solid particles from said aqueous phase and drying said particles, thereby forming toner particles having a non-spherical shape.