Manufacturing method for toner used in electrophotography

Details Manufacturing method for toner used in electrophotography Manufacturing method for toner used in electrophotography

1997-03-20

1998-12-01

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

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

Process of making developer composition

G03G 909

Patent

active

058436146

ABSTRACT:
A novel manufacturing method for toner used in electrophotography employing no organic solvent is disclosed. The method comprises the steps of: (1) combing a colored melted resin (a) and an aqueous medium (b), wherein the colored melted resin (a) is prepared by heating and melting a kneaded material containing a synthetic resin for use in an electrophotographic toner having an ionic group and a coloring pigment, and the aqueous medium (b) contains a substance capable of neutralizing the ionic group, and possesses a raised temperature not lower than the softening point of the synthetic resin by way of heating with application of pressure where necessary; (2) dispersing the colored melted resin (a) in the aqueous medium (b) by mechanical means while maintaining a mixture of the colored melted resin (a) and the aqueous medium (b) at a temperature not lower than the softening point of the synthetic resin; (3) producing an aqueous suspension of colored resin microparticles by means of sudden cooling; (4) separating the colored resin microparticles from the suspension; and (5) drying the separated colored resin microparticles.

REFERENCES:
patent: 3910846 (1975-10-01), Azar et al.
patent: 5622806 (1997-04-01), Veregin et al.
patent: 5665506 (1997-09-01), Kashima et al.
Derwent Publications; JP 06 332 225 A(Dainipon), Dec. 2, 1994.
European Search Report for European Application 97104875.6 dated Jul. 21, 1997,

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