Dainippon Ink and Chemicals, Incorporated

Seiichi Shimizu

Shinji Amaya

Yoshiyuki Iwanari

Toshiro Kogawara

Masahiro Yoshida

Kinji Shinzo

Kazuya Kuriyama

Noboru Nakaibayashi

Syuuichi Yamazaki

A magenta toner, a yellow toner, a cyan toner, and a black toner each for development of an electrostatic latent image ad a combination of the four color toners for obtaining a full color image are disclosed, the magenta toner containing a naphthol type organic pigment represented by formula (I): ##STR1## the yellow toner containing a disazo type organic pigment represented by formula (II): ##STR2## the cyan toner containing a .beta. type copper phthalocyanine pigment and a polychlorocopper phthalocyanine pigment, and the black toner containing at least one of an isoindolinone type yellow pigment and a tetrachloroisoindolinone type yellow pigment, at least one of a quinacridone type red pigment and a perylene type red pigment, and a phthalocyanine type blue pigment. The color toners are unaffected by environmental changes and capable of providing color images having stable characteristics.

Combination of color toners for developing electrostatic latent image

A color toner composition for an electrostatic developer is disclosed, comprising a cyan pigment, a magenta pigment or a yellow pigment, a binder resin and a negative charging-controlling agent, wherein the binder resin is a vinyl-modified polyester resin as obtained by graft polymerizing.

Color toner composition for electrostatic developer

A color toner composition for developing electrostatic images comprises a coloring agent and a binder resin, wherein the binder resin is a vinyl-modified polyester resin obtained by graft polymerizing

Color toner composition for developing electrostatic images

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Saitama, Japan

Seiichi Shimizu