Tomoegawa Paper Co., Inc.

Matsushita Electric Industrial Co., Ltd.

Makoto Miura

Koji Harakawa

Akira Fukano

Takayuki Sano

Akira Fujiwara

Ryuji Nishiyama

A two-component developer suitable for use with an image-forming apparatus which permits the removal and recovery of a toner remaining on a photoconductive drum after the transfer of the toner to a receptor sheet without using cleaning means, comprising a toner formed of toner matrix particles containing a binder resin and a colorant as main components, and a magnetic powder adhering to a surface of each toner matrix particle, and a magnetic carrier having a saturation magnetization of 90 to 200 emu/g in an external magnetic field of 3,000 oersted.

Two-component developer and image-forming method for which the developer

An object of the present invention to provide novel developing compositions for use in electrphotography which do not cause an adherence of ferrite carriers to the surface of a photoconductor while maintaining high definition and high picture quality of the picture image by using fine size ferrite carriers. The aforementioned developing compositions for use in elecrophotography comprise toners which contain a binding resin and colorant as main components, and ferrite carriers comprised of 5 to 40 mol % of ZnO and 60 to 95 mol % of Fe.sub.2 O.sub.3, and possess a saturated magnetization value of 70 to 100 emu/g in an applied magnetic field of 3000 oersted.

Developing compositions for electrophotography

Growing community of inventors

Shizuoka, Japan

Makoto Miura