Electrophotographic developer and carrier therefor, core...

Details Electrophotographic developer and carrier therefor, core... Electrophotographic developer and carrier therefor, core...

2007-04-17

2011-10-18

Rodee, Christopher (Department: 1721)

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

C430S111350, C430S111330, C399S159000

Reexamination Certificate

active

08039189

ABSTRACT:
The present invention can provide small-diameter core material particles for electro photographic carrier, the particles that can prevent occurrences of carrier adhesions and reduce toner spent, have excellent durability and cause little fluctuations in image density with a narrow particle diameter distribution, and an efficient, cost-effective production method thereof. That is, the core material particles for electro photographic carrier are particles wherein the weight average particle diameter, Dw, is in the range of 22 μm to 32 μm, the ratio of Dw to the number average particle diameter, Dp, satisfies the condition, 1<Dw/Dp<1.20, the content of particles smaller than 20 μm in diameter is in the range of 0% by mass to 7% by mass and smaller than 36 μm is in the range of 90% by mass to 100% by mass, and the BET specific surface area is in the range of 300 cm2/g to 900 cm2/g.

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