Fuji Xerox Co., Ltd.

Fuji Photo Film Company, Limited

Yoshimi Amagai

Shigeo Aonuma

Koichi Tanaka

Hiroshi Takayama

Toshiaki Murofushi

Hiroshi Nakazawa

Koichi Oyamada

Takaaki Kimura

Yasuji Fukase

Yasuhiro Ohya

An electrophotographic two-component system developer is described, comprising a positive charging toner and a negative charging carrier of the dispersed magnetic powder type, wherein a hydrophilic alumina particle is adhered onto the surface of said positive charging toner and a negative charging carrier has a volume average particle diameter of from 30 to 80 .mu.m. The developer provides reduced toner cloud upon development processing and provides toner images free from fog.

Two component electrophotographic developer

Dry toners for use in electrostatic latent image development comprising a colorant in a resin binder are described, wherein said resin binder comprises a polyester containing --COOH groups in which at least one of the --COOH groups is replaced with nitrogen-containing compounds such as amines, ammonium salts, betaines, pyridinium salts, and azines. These toners are superior in development of negatively charged latent images and exhibit good low temperature fixability.

Dry electrophotographic toner comprising graft copolymer

A toner for developing an electrostatic latent image characterized by a vinyl copolymer whose acid value is in the range of about 5 to 100.

Toner for developing electrostatic latent image containing copolymer of

A dry toner that is heat-fixable and/or press-fixable is disclosed, comprising (a) a colorant; and (b) a graft copolymer comprising (i) a crystalline polymer having a melting point of from 45.degree. C. to 200.degree. C., which is prepared from one or more monomers selected from ethylene, propylene and vinyl acetate, and (ii) an amorphous polymer having a glass transition point of 45.degree. C. or more, which is prepared from one or more vinyl monomers.

Dry toners comprising a colorant and graph copolymer comprising a

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Kanagawa, Japan

Yoshimi Amagai