Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1993-07-28
1995-02-28
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430137, G03G 9135
Patent
active
053936353
ABSTRACT:
The invention is a negative charge director for liquid electrographic toners. The charge director comprises a very weakly associating, charged functional group covalently bonded in the resin coating of the toner particle, and a very strongly chelating, preferably neutrally charged, molecule dispersed in the liquid phase to achieve charge separation. The weak association site on the resin is prepared, via well-known ion-exchange chemistry, in the metal form desired. Preferred metals are those with no regulatory, health or environmental issues, such as K+, Na+, Ca.sup.2+, Al.sup.3+, Zn.sup.2+, Zr.sup.4+, Mg.sup.2+, ammonium (NH.sub.4 +), and organic cations.
The cation-associated resin is brought into dispersion with the solution phase chelating molecule. When this is done, the equilibria that compete for the cation are such that it is released from the resin and bound in the chelate. The toner particle is left with a net negative charge which is permanent, but which is balanced by an equal, opposite charge on the chelated cationic species in the continuous phase. Preferably, there are no other sources of charge in the dispersion, and there is no excess of charge carriers in the continuous phase which would interfere with development.
REFERENCES:
patent: 2786440 (1957-03-01), Giaimo, Jr.
patent: 2907674 (1959-10-01), Metcalfe et al.
patent: 4897332 (1990-01-01), Gibson et al.
patent: 4925766 (1993-05-01), Elmasry et al.
patent: 5045425 (1991-09-01), Swidler
patent: 5130221 (1992-07-01), El-Sayed et al.
patent: 5144036 (1992-09-01), Alexandrovich et al.
Mechanism Of Electric Charging Of Toner Particles in Nonaqueous Liquid With Carboxylic Acid Charge Additives.
Bearss James G.
Russell Dale D.
Goodrow John
Hewlett--Packard Company
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