Processes for the preparation of developer compositions

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

1994-09-06

1996-01-30

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

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

Process of making developer composition

430114, G03G 9125

Patent

active

054879655

ABSTRACT:
A process for preparing a liquid developer composition comprising: a) forming a melt mixture comprised of a polymer resin or resins, a colorant, a charge director additive, and a hydrocarbon liquid carrier, to obtain a first suspension of colored polymeric particles with an area average diameter of from about 2 to about 100 microns; b) dispersing said first suspension in a supercritical fluid medium and thereafter continuously feeding the resultant dispersion to a liquid fluidizing means under pressure to obtain a second suspension comprising a supercritical fluid and liquid developer mixture containing colored polymeric particles with an area average diameter of from about 0.1 to about 10 microns; and c) reducing the pressure to evaporate, and optionally recovering, the supercritical fluid medium from said second suspension, wherein there results a liquid developer mixture containing colored polymeric particles with an area average diameter of less than about 3.0 microns and a solids content of about 10 to about 90 weight percent.

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: 5270359 (1993-12-01), Romangosa et al.

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