Developer without carrier powder having an improved triboelectri

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

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430107, 430110, G03G 908

Patent

active

043140173

ABSTRACT:
A developer is composed of colored insulating particles for developing an electrostatic image wherein at least the external surface of each particle comprises two different areas of which one area constitutes a major portion of said external surface and comprises an element which defines the polarity of the triboelectric charge of said particle to a determined polarity while the other area comprises an element capable of being easily separated from said particle, transferred to a surface of a developing device and charged to a polarity opposite to that of said particle.

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patent: 4134760 (1979-01-01), Gibson et al.
patent: 4142981 (1979-03-01), Bean et al.
patent: 4148640 (1979-04-01), Dulmage et al.

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