Patent ID: 8546057
Filing Date: 2013-10-01
Classification: G03G

Abstract:
1. A process for preparation of toner particles comprising carbon black and polymeric binder, comprising: preparing a masterbatch comprising carbon black particles and a first addition polymer comprising carboxylic acid groups along the polymer backbone and having an Acid Value of from 50-200, where the first addition polymer is present at a weight ratio of greater than 1:2 relative to the amount of carbon; dissolving a thermoplastic second polymer binder in an organic solvent; adding the masterbatch to the solution of second polymer binder to form an organic phase, wherein the first addition polymer is present at a lower weight percent than the second polymer; dispersing the organic phase in an aqueous phase comprising a particulate stabilizer to form a dispersion; and removing the solvent from the organic phase to form toner particles comprising the first addition polymer, the second polymer binder, and carbon black.