Two-component developer

Details Two-component developer Two-component developer

2007-02-21

2009-11-17

Goodrow, John L (Department: 1795)

Radiation imagery chemistry: process, composition, or product th

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

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

C430S111400

Reexamination Certificate

active

07618760

ABSTRACT:
A two-component developer suppresses burying of an external additive into toner particles and a change in charging performance of a toner with time, and secures stable development performance. The two-component developer includes a toner and a carrier and is adjusted so that a rate of change ΔA % in BET specific surface area A (m2/g) of the toner (=((A120−A1)/A1)×100) and a rate of change ΔC % in charge quantity C (μC/g) of the carrier (=((C120−C1)/C1)×100) when a mixture of the toner and the carrier is stirred and mixed are both within 10 %. A1and A120indicate BET specific surface areas of the toner when the mixture of the toner and the carrier is stirred and mixed for 1 minute and 120 minutes, and C1and C120indicate charge quantities of the carrier when the mixture is stirred and mixed for 1 minute and 120 minutes.

REFERENCES:
patent: 5994019 (1999-11-01), Okado et al.
patent: 2005/0233239 (2005-10-01), Fujiwara et al.
patent: 02-067567 (1990-03-01), None
patent: 05-181304 (1993-07-01), None
patent: 2004-240158 (2004-08-01), None
patent: 2004-264602 (2004-09-01), None

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