Process for charging toner compositions

摘要

An improved process for rapidly charging toner particles which comprises (I) adding uncharged replenishment toner particles to a charged developer composition comprised of carrier particles and toner particles, the carrier particles consisting of a core containing a continuous polymer coating thereover having incorporated therein a fluoropolymer, contained on from about 1 percent to about 20 percent of the surface area of the coating, (II) contacting the charged developing composition containing said carrier particles with uncharged toner particles wherein charges are transferred to the uncharged toner particles within a mixing period of from about 5 seconds to about 5 minutes, thereby resulting in substantially the same level of charge intensity for said uncharged toner particles as the charge intensity for the charged toner particles in the charged developer composition, which charge intensity for example is from about 5 microcoulombs per gram to about 50 microcoulombs per gram of toner particles.