Method of producing a toner particle

摘要

A toner particle production method has an annealing step that is performed after the preparation of a resin solution by the dissolution or dispersion, in an organic solvent, of a binder resin having a polyester resin as its major component and a block polymer having a polyester segment and a vinyl polymer segment, and the preparation of a resin particle dispersion in which resin particles are dispersed by a dissolution suspension method, wherein, in this annealing step, the temperature of the obtained resin particle dispersion is held for at least 60 minutes in the temperature range from TgA-15 (° C.) to TmA (° C.), and under the conditions of a temperature variation range of not more than 20° C. and a temperature variation rate of not more than 0.35° C./minute.

主权项

1. A method of producing a toner particle, comprising the steps of:
preparing a resin solution by dissolving, in an organic solvent, a binder resin having a polyester resin as its major component, and a block polymer having a crystalline polyester segment and a vinyl polymer segment; preparing a resin solution dispersion by dispersing the resin solution in an aqueous medium; and removing the organic solvent present in the resin solution dispersion to produce a resin particle dispersion in which a pre-annealing-treatment resin particle is dispersed in the aqueous medium, the method further comprising a step of holding the resin particle dispersion for at least 60 minutes under temperature conditions that satisfy the following (i), (ii), and (iii): (i) from TgA-15 (° C.) to TmA (° C.); (ii) a temperature variation range of not more than 20° C.; and (iii) a temperature variation rate of not more than 0.35° C./minute, where TgA (° C.) indicates a glass transition point of the pre-annealing-treatment resin particle and TmA (° C.) indicates an onset temperature of an endothermic peak originating from the block polymer present in the pre-annealing-treatment resin particle.