Ricoh Company, Ltd.

Junya Koeda

Kenichi Uehara

Junichi Watanabe

Keisuke Tada

Hiroyuki Yoshikawa

Daisuke Misawa

Miyuki Hirata

Osamu Kouzu

A method of manufacturing toner including preparing a first liquid by dissolving or dispersing toner components including one or both of a binder resin and a precursor thereof in an organic solvent; preparing a second liquid by dispersing the first liquid in a first aqueous medium including a dispersant; producing primary particles by removing the organic solvent from the second liquid; washing the primary particles; preparing a third liquid by dispersing the washed primary particles in a second aqueous medium and heating the second aqueous medium while or after dispersing the washed primary particles therein; and producing toner particles by adding a charge controlling agent to the third liquid. This method satisfies the following inequation:0.60&#x2266;&#x2266;1.00wherein Sa represents a BET specific surface area of the primary particles included in the third liquid and Sb represents that of the toner particles stored for 2 weeks at 40&#xb0; C., 70% RH.

Method of manufacturing toner and toner

A method of producing a toner composition, including stirring and mixing toner particles comprising a binder resin, a colorant and a release agent with a charge controlling agent in a fluidizing and stirring mixer comprising a rotor having a stirring blade to fix the charge controlling agent on a surface of the toner particles, wherein the stirring and mixing comprises rotating the rotor at a peripheral speed of from 65 to 120 m/s at an environmental temperature (T) in the fluidizing and stirring mixer, satisfying the relationship,Tg-10&#x3e;T&#x3e;Tg-35(&#xb0; C.), where the Tg represents a glass transition temperature of the binder resin.

Method and apparatus for producing toner for electrophotography

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Shizuoka, Japan

Junya Koeda