Two component electrophotographic developer
AssigneeFuji Xerox Co., Ltd.
InventorsToshiaki Murofushi, Hiroshi Nakazawa, Koichi Oyamada, Shigeo Aonuma, Yoshimi Amagai, Yasuhiro Ohya
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Abstract
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.
Claims8
An electrophotographic two-component system developer comprising a positive charging toner comprising a colorant in a binder resin, hydrophilic alumina particles externally added onto the surface of the toner, and a negative charging carrier comprising a magnetic powder dispersed in a binder resin, wherein said hydrophilic alumina particles are adhered onto the surface of said positive charging toner and the negative charging carrier has a volume average particle diameter of from 30 to 80 .mu.m.
The electrophotographic two-component system developer comprising:
- particles of a negative charging carrier comprising a magnetic powder dispersed in a binder resin and having a volume average particle diameter of from 30 to 80 .mu.m;
- and particles of a positive charging toner having a volume average particle diameter of about 30 .mu.m or less and having from 0.1 to 3.0% by weight, based on the total weight of the toner, of hydrophilic alumina particle adhered onto the surface of said toner particles, said toner particles comprising a colorant in a binder resin and said alumina particles having an average particle diameter of from 0.01 to 1.000 .mu.m.
Dependencies are inferred from the claim text.