Method for producing electrophotographic liquid developer

Details Method for producing electrophotographic liquid developer Method for producing electrophotographic liquid developer

1990-02-06

1990-10-30

Martin, Roland E.

Radiation imagery chemistry: process, composition, or product th

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

Process of making developer composition

430114, 430115, G03G 500

Patent

active

049668250

ABSTRACT:
A method for producing an electrophotographic liquid developer comprising: (A) a mixing step of stirring a mixture comprising a coloring agent, an ethylenic copolymer, and an electrically insulating liquid having an affinity with the copolymer, at a temperature higher than the softening point of the copolymer; (B) a dispersing step of dispersing the mixture in an electrically insulating liquid after cooling to a temperature below the softening point of the copolymer; and (C) a diluting step of diluting the dispersion with an electrically insulating liquid to provide a liquid developer for use; wherein step (A) and/or step (B) is performed in the presence of a charge controlling agent or a basic nitrogen-containing polymer.

REFERENCES:
patent: 4614699 (1986-09-01), Kitatani et al.
patent: 4760009 (1988-07-01), Larson

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