Process for preparing electrophotographic toner

Details Process for preparing electrophotographic toner Process for preparing electrophotographic toner

1988-10-17

1990-01-16

Goodrow, John L.

Radiation imagery chemistry: process, composition, or product th

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

Process of making developer composition

430110, G03G 908

Patent

active

048943088

ABSTRACT:
A process for preparing an electrophotographic toner composition which comprises premixing a pigment and a charge control additive in the absence of a solvent, subsequently admixing the premixed pigment and charge control additive and a resin, and extruding the pigment, charge control additive, and resin. The pigment and the charge control additive may be premixed prior to being added to the extruder with the resin; alternatively, the pigment and charge control additive may be premixed by adding them to the extruder via an upstream supply means and extruding them, and subsequently adding the resin to the extruder via a downstream supply means.

REFERENCES:
patent: 3893934 (1975-07-01), Braun et al.
patent: 4110844 (1978-08-01), Nakamura
patent: 4621039 (1986-11-01), Ciccarelli et al.
patent: 4649005 (1987-03-01), Kobayashi et al.

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