Carrier for electrostatic latent image developing and two-compon

Details Carrier for electrostatic latent image developing and two-compon Carrier for electrostatic latent image developing and two-compon

1999-12-16

2000-10-03

Martin, Roland

Radiation imagery chemistry: process, composition, or product th

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

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

4301066, 430111, G03G 9113

Patent

active

061270792

ABSTRACT:
A two-component-type developing agent comprising a silicone resin-coated carrier and a positively charging toner, the silicone coated carrier having an average particle diameter of from 60 to 110 .mu.m, the silicone resin coating having an average thickness of from 0.1 to 0.3 .mu.m, the carrier having a resistivity of from 1.5.times.10.sup.8 to 1.5.times.10.sup.11 .OMEGA..multidot.cm, the toner concentration being from 3.0 to 5.0 % by weight and the amount of electric charge by friction of the toner based on the suction method being from +10 to +20 .mu.c/g. The silicone resin-coated carrier and the developing agent feature long life without permitting the spent toner to adhere on the carrier surfaces, without permitting the carrier coating to peel off even after repetitively used for extended periods of time, featuring stable amount of electric charge by friction, stable developing properties, and maintaining favorable image quality for extended periods of time developing none of carrier dragging, toner scattering in the machine, background fogging or defective image density.

REFERENCES:
patent: 4584254 (1986-04-01), Nakayama et al.
patent: 4927728 (1990-05-01), Isoda et al.
patent: 5731120 (1998-03-01), Tanigami et al.
patent: 5766814 (1998-06-01), Baba et al.
patent: 5885742 (1999-03-01), Okado et al.

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