Processes for the preparation of developer compositions

Details Processes for the preparation of developer compositions Processes for the preparation of developer compositions

1993-07-28

1995-02-07

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

053874897

ABSTRACT:
Disclosed is a process for preparing a liquid or dry electrophotographic developer comprising: (a) forming a melt mixture comprised of a polymer resin or resins, a colorant, a charge director, and a nonaqueous solvent to obtain a first suspension of colored polymeric particles with a volume average diameter of from about 5 to about 100 microns; and (b) homogenizing with a dairy piston homogenizer said first suspension under pressure of from about 100 to about 500 Bars to obtain a second suspension containing colored polymeric particles with a volume average diameter of from about 0.1 to about 5 microns.

REFERENCES:
patent: 4783389 (1988-11-01), Trout et al.
patent: 4917986 (1990-04-01), Chan et al.
patent: 4960667 (1990-10-01), Wong et al.
patent: 5053306 (1991-10-01), El-Sayed et al.
patent: 5123962 (1992-06-01), Komuro et al.
patent: 5168022 (1992-12-01), Wasmund et al.
patent: 5262268 (1993-11-01), Bertrand et al.

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