Xerox Corporation

Heather M Wright

Hadi K Mahabadi

Michael F Cunningham

Sandra J Gardner

Toner particles may be produced using a semisuspension polymerization process, which includes: (a) providing a mixture of a partially polymerized monomer or comonomers near the onset of the gel-effect; (b) forming a suspension of the partially polymerized monomer or comonomers; and (c) suspension polymerizing the partially polymerized monomer or comonomers while slowly adding a second monomer or comonomers in a starved feed manner. The process may be used to produce toner particles having varied particle properties, and having a morphology ranging from core-shell and inverted core-shell microcapsules to pseudo core-shell microcapsules and to polyblend composites having a low molecular weight phase dispersed in a high molecular weight matrix.

Polyblend polymeric composite and microcapsule toners, and a process for producing the same

A process for the preparation of toner compositions which comprises mixing at least one resin monomer with a polymerization initiator, a crosslinking component and a chain transfer component; effecting bulk polymerization until partial polymerization to near the onset of the gel-effect has been accomplished thereby forming an organic phase containing a partially polymerized component; mixing the aforementioned partially polymerized component organic phase with pigment or dye particles; dispersing the resulting organic phase in water containing a stabilizing component whereby there is obtained a suspension of toner particles in water; and polymerizing the toner suspension by heating.

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Heather M Wright