Canon Kabushiki Kaisha

Toshiyuki Koshio

Toru Matsumoto

Toshiaki Nakahara

Yasuhide Goseki

Masuo Yamazaki

Ichiro Ohsaki

Katsutoshi Wakamiya

Hisayuki Ushiyama

Junichi Kurimoto

Hisayuki Ochi

A mixture of a colorant, and a binder compound having an aliphatic hydrocarbon long chain and having a relatively low melt viscosity, is kneaded in a molten state in the presence of solid media such as balls or beads to form a uniform mixture in which the colorant particles or aggregates have been disintegrated to a size of 5 .mu. or below. Solid particles which may be used as a toner are formed from the uniform mixture and may be encapsulated, as desired, to provide a capsule toner.

Process for preparing toner or capsule toner for use in

An encapsulated toner for development of electrical latent images comprises a core particle containing a colorant and a soft solid material, inorganic fine particles attached to the vicinity of the surface of the core particle, and a shell coating the core particle and the inorganic fine particles. The inorganic fine particles function to, e.g., reinforce the encapsulated toner with a thin shell and may be attached to the core particles through dry-mixing. The core particles with the attached inorganic particles may be coated with a shell resin through phase separation.

Encapsulated electrostatic toner with locally attached non-magnetic

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Tokyo, Japan

Toshiyuki Koshio