Nippon Zeon Company, Ltd.

Takuji Kishimoto

Kojiro Masuo

Hiroyuki Watanabe

Shizuo Kitahara

Takafumi Kawanaka

Kohkichi Noguchi

Kazu Niwa

Tetuya Toyoshima

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

Toner for development of electrostatic image and production process thereof

An additive for improving the dispersibility of a particulate substance in an organic medium, a thermoplastic polymer, or a thermosetting resin, is at least one compound having a ##STR1## bond in the molecule, including, for example, compounds having an oxazolinium ion in the molecule. The preferred additive compounds are oligomeric or polymeric.

Additive for organic medium or thermoplastic polymer

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Kanagawa, Japan

Takuji Kishimoto