Fuji Xerox Co., Ltd.

Masayuki Takei

Hideyuki Akagi

Takashi Imai

Satoshi Inoue

Yasuo Yamamoto

Masanori Ichimura

Michio Take

Koji Fukushima

Masaru Miura

Hiroshi Nakazawa

Yutaka Sugizaki

Hiroshi Takayama

Susumu Saito

Yuichi Yashiki

Junichi Tomonaga

Naoki Ohta

Toshiaki Murofushi

Yasushi Sakata

A developing sleeve for electrophotography is disclosed which has a coating film comprising electroconductive and preferably lubricating particles dispersed in an acrylic resin in which the content of components having a molecular weight lower than 500 is not higher than 3% by weight. The developing sleeve is effective in preventing development ghosts while preventing toner dusting during transfer from becoming worse and has a small environmental dependence of developing properties.

Developing sleeve for electrophotography and process for image formation

A color toner providing a toner image excellent in brightness, clearness and graininess and a process for producing the same are disclosed, wherein a proportion of dispersed pigment particles having a circle-equivalent diameter of 0.3 .mu.m or greater does not exceed 0.1% of the total number of said dispersed pigment particles. The process comprises kneading a water-containing pigment paste and a binder resin at a temperature of 100.degree. C. or higher under pressure in a heat and pressure kneader to remove a water content to obtain a pigment dispersion, melt-kneading the resulting pigment dispersion together with a binder resin, and grinding the mixture.

Color toner and process for producing the same

A toner for developing an electrostatic charge image is disclosed, which is formed by adding and mixing an external additive with toner particles having an average particle size of not larger than 9 .mu.m and comprising at least a colorant and a binder resin, wherein the external additive is fine particles having a particle size of 20 to 80 nm. There is also disclosed a process for preparing the toner which comprises adding external additives to the toner particles and mixing them, wherein the addition and mixing of said external additive are carried out under specific conditions.

Toner for developing electrostatic charge image and process for

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Minami-ashigara, Japan

Masayuki Takei