Process for forming toners from dry pigments

Details Process for forming toners from dry pigments Process for forming toners from dry pigments

2007-09-11

2007-09-11

Goodrow, John L (Department: 1756)

Radiation imagery chemistry: process, composition, or product th

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

Process of making developer composition

C430S105000

Reexamination Certificate

active

11003662

ABSTRACT:
A process for preparing toner compositions using a dry pigment is provided. The process comprises combining a base toner resin composition, a dry pigment, and dispersion agent in a one step process, without the need any pre-processing of the pigments such as by, for example, flushing. The process includes combining the base toner resin, dry pigment and dispersion agent in a processing apparatus such as an extruder. The process may also comprise preparing the toners via an extrusion process utilizing a screw having a configuration designated herein as a Type C screw.

REFERENCES:
patent: 5536613 (1996-07-01), Chang et al.
patent: 5885739 (1999-03-01), Dalal et al.
patent: 6593049 (2003-07-01), Veregin et al.
patent: 6756176 (2004-06-01), Stegamat et al.
patent: 2004/0142266 (2004-07-01), Sacripante et al.

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