PROCESS FOR PRODUCING TONER FOR ELECTROSTATIC IMAGE DEVELOPMENT

摘要

A process for producing a toner for electrostatic image development composed of microcapsule toner particles, the microcapsule toner particles each comprising a core material constituted of a binder resin composed of a colorant and an olefinic copolymer of ring structure and, covering the core material, an outer shell material constituted of a binder resin, characterized in that fine particulate liquid drops of a solution comprising a good solvent solution of binder resin for constituting the core material and, dispersed therein, a colorant are injected and delivered into a poor solvent solution of binder resin for constituting the outer shell material so as to effect encapsulation. The thus produced microcapsule toner is satisfactorily applicable to not only low-temperature thermal fixing but also pressure fixing and hot roller fixing systems capable of realizing high-speed copying. Further, the microcapsule toner can solve problems of conventional microcapsule toners, excels in storage stability and offset development prevention, and can realize uniform particle size distribution which enables hue of high density.