Appeal No. 1996-3982
Application No. 08/315,005
THE INVENTION
The invention is directed to a process for the preparation of a liquid developer,
wherein the developer comprises a liquid hydrocarbon vehicle, thermoplastic resin
particles, pigment, a charge additive or adjuvant and a charge director. The process
consists essentially of subjecting the liquid vehicle to a supercritical solvent
extraction whereby the hydrocarbon is extracted by the supercritical solvent
resulting in a liquid vehicle having a higher solids content. One supercritical solvent
used is carbon dioxide.
THE CLAIMS
Claims 1 and 2 are illustrative of appellants’ invention and are reproduced
below.
1. A process for the preparation of a liquid developer consisting essentially
of a hydrocarbon liquid vehicle, thermoplastic resin particles, pigment, a charge
additive or adjuvant, and a charge director, which process consists essentially of a
supercritical solvent extraction of said liquid vehicle and wherein said liquid
developer possesses a high solids content.
2. A process for the preparation of a liquid developer consisting essentially
of a liquid vehicle, thermoplastic resin particles, pigment, a charge adjuvant and a
charge director, which process consists essentially of the supercritical carbon
dioxide solvent extraction of said liquid vehicle of said developer and wherein said
liquid developer possesses a high solids content of from about 50 to about 90
weight percent, and wherein the solids are comprised of thermoplastic resin
particles, pigment, and charge adjuvant.
THE REFERENCES OF RECORD
As evidence of obviousness, the examiner relies upon the following references.
2
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