Importance

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Abstract

A method of producing toner particles for use in electrophotography where the particles have a colored resin core particle containing a resin and a colorant and charge controlling layer on the particle's outer surface. The charge controlling layer contains a charge controlling agent but not any colorant. The method comprises the steps of: (1) preparting toner core particles by mixing, kneading, crushing and sorting a first material including a resin material and a colorant, (2) preparing charge controlling particles with smaller diameters than the toner core particles by mixing, kneading, crushing and sorting a second material including a charge controlling agent, and (3) thereafter mixing the toner core particles the said charge controlling particles and causing a charge controlling layers to be formed around the toner core particles by applying a pressure to the mixed particles.

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First Claim