Nippon Zeon Company, Ltd.

Kazu Niwa

Kojiro Masuo

Kazuhiro Sato

Takahiro Takasaki

Takuji Kishimoto

Shuichi Yokoyama

A toner for development of electrostatic images, comprising at least a binder resin, a colorant and a charge control agent, wherein the charge control agent contains a positive charge control resin (A) composed of a polymer having a weight average molecular weight of 1,000 to 100,000 and a functional group which brings positively charging ability, and a negative charge control resin (B) composed of a polymer having a weight average molecular weight of 1,000 to 100,000 and a functional group which brings negatively charging ability. The toner is excellent in flowability, shelf stability and charge properties, and provides images excellent in image quality.

Toner for development of electrostatic image

A toner for development of electrostatic images, comprising at least a binder resin, a colorant and a charge control agent, wherein the charge control agent is a polar resin composed of a copolymer of a vinyl monomer and SO X (X&equals;H or alkali metal) group-containing (meth)acrylamide and having an SO X group-containing (meth)acrylamide unit content of 0.1 to 10 wt. % and a weight average molecular weight of 17,000 to 25,000, and a production process of the toner.

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Kanagawa, Japan

Kazu Niwa