Powdertech Co., Ltd.

Kazunori Takagi

Yuji Sato

Kanao Kayamoto

Masaaki Yamaya

Yuji Yoshikawa

Takao Sugiura

Toshio Honjo

Tsuyoshi Itagoshi

Masahiro Ogata

Norio Takei

A carrier for an electrophotographic developer which comprises a carrier core and a resin coat having a conducting agent dispersed therein, the resin coat having an inner layer on the carrier core side and an outer layer coating the inner layer, wherein the inner layer contains 7 to 20% by weight of a conducting agent based on the resinous solid content of the inner layer, the outer layer contains 3 to 15% by weight of a conducting agent based on the resinous solid content of the outer layer, and the conducting agent content of the inner layer is greater than that of the outer layer.

Carrier for electrophotographic developer and electrophotographic developer containing the same

A carrier for an electrophotographic developer which is coated with an insulating resin containing a white conducting agent, wherein the white conducting agent includes spherical to lumpy particles of TiO,ZnO,or SnO,having two or more average particle sizes, the particles having thereon a 5 to 50 &angst; thick conducting layer of SnO,having a group V metal or phosphorus in solid solution therein.

A resin-coated carrier for an electrophotographic developer which comprises a carrier core coated with an acryl-modified silicone resin the silicone resin of which has a methyl group and other organic groups, the molar ratio of the methyl group to the total organic groups inclusive of the methyl group &lsqb;methyl group/(methyl group&plus;other organic groups)&rsqb;being 64 mol % or higher and lower than 70 mol %, and the acrylic resin to silicone resin weight ratio ranging from 2/8 to 4/6.

A ferrite carrier for electrophotographic developers which is represented by formula:

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Chiba-ken, Japan

Kazunori Takagi