Hitachi Chemical Company, Ltd.

Yuugo Kumagai

Isamu Moribe

Takayuki Saito

Masato Fukasawa

Akihiro Kobayashi

Toshiyuki Fujita

Takashi Ikeda

Hatuo Sugitani

Osamu Higashida

Ikutoshi Shibuya

Chiaki Okada

Tetsuya Fujii

Ryouji Tan

A dry toner composition comprising (A) a binder resin, (B) a colorant and (C) charge control agents comprising a special metal complex of oxycarboxylic acid (C-1) and a special metal complex of azo compound (C-2) can provide high quality images without causing toner flying even after printed for a long period of time, and thus is useful for providing a dry developer and a process for forming images using said dry developer.

Dry toner, dry developer and process for forming electrophotographic

A toner comprising a vinyl polymer having a hydroxyl number of 50 to 350 and a glass transition point of 35.degree. to 100.degree. C., obtained from one or more monomers having a secondary hydroxyl group and, if necessary, one or more vinyl monomers copolymerizable with the vinyl monomer having a secondary hydroxyl group, is excellent in resistance to adhesion to non-rigid polyvinyl chloride and resistance to blocking under high humidity.

Toner for developing electrostatic image comprising vinyl polymer having

A toner for developing latent electrostatic images comprising a copolymer having as an essential component a monomer unit derived from an imido group-containing unsaturated monomer of the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined in the specification, has excellent properties such as resistance to adhesion to plasticized polyvinyl chloride, high image density, resistance to fogging, etc.

Electrophoto toner comprising imido group monomer unit in polymer

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Hitachi, Japan

Yuugo Kumagai