Developing agent for electrophotography and developing method

Details Developing agent for electrophotography and developing method Developing agent for electrophotography and developing method

1995-11-01

1997-04-15

Martin, Roland

Radiation imagery chemistry: process, composition, or product th

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

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

430110, 430111, 430903, G03G 1308, G03G 9097

Patent

active

056208235

ABSTRACT:
A developing agent for electrophotography which comprises toner particles containing a resin binder and a colorant. The toner particles include which have diameter of 5 .mu.m or less and which account for less than 10% by number of all particles, and include particles which have diameter of 20 .mu.m or more and which account for less than 0.5% by weight, and the weight average standard deviation in particle diameter of the toner particles is 2.5 .mu.m or less. The developing agent may further contain an external additive comprising small silica particles 6 nm to less than 18 nm in average primary particle diameter and large silica particles 18 nm to less than 46 nm in average primary particle diameter.

REFERENCES:
patent: 4985327 (1991-01-01), Sakashita et al.
patent: 4987454 (1991-01-01), Natsuhara et al.
patent: 5009973 (1991-04-01), Yoshida et al.
patent: 5120631 (1992-06-01), Kanbayashi et al.
patent: 5137796 (1992-08-01), Takiguchi et al.
patent: 5155532 (1992-10-01), Sakurada et al.
patent: 5328792 (1994-07-01), Shigemori et al.

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