Toner for electrostatic development, charge controlling...

Details Toner for electrostatic development, charge controlling... Toner for electrostatic development, charge controlling...

2005-02-22

2005-02-22

Goodrow, John L (Department: 1756)

Radiation imagery chemistry: process, composition, or product th

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

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

C544S348000

Reexamination Certificate

active

06858366

ABSTRACT:
A positively charging dry toner for developing an electrostatic latent image including a nigrosine dye or nigrosine pigment containing 500 ppm or less nitrobenzene and 800 ppm or less aniline as a charge controlling agent. The dye or pigment is prepared by dispersing the nigrosine dye or nigrosine pigment obtained by an usual method in a solvent, adding an oxidizing agent such as bleaching powder to the solvent dispersion to conduct oxidation treatment and, if necessary, removing the solvent by steam distillation.

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