Process for producing toner for developing electrostatic images

Details Process for producing toner for developing electrostatic images Process for producing toner for developing electrostatic images

1988-03-28

1988-11-01

Welsh, J. David

Radiation imagery chemistry: process, composition, or product th

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

Process of making developer composition

241 24, 241 81, 209 10, 209135, B02C 1906, G03G 900

Patent

active

047820012

ABSTRACT:
A process for producing toner particles for developing electrostatic latent images, comprising the steps of introducing colored solid particles containing a binder resin into a multi-division classifying zone divided into at least three sections by partitioning means, so that the particles are fallen along curved lines; collecting a coarse powder consisting primarily of coarse particles in a first divided section, a medium powder consisting primarily of particles having a particle size within a defined range in a second divided section and a fine powder consisting primarily of particles having a particle size smaller than the defined range in a third divided section; feeding the classified coarse powder to a pulverizing step; and introducing the pulverized powder into the multi-division classifying zone. An apparatus for practicing the process is also disclosed.

REFERENCES:
patent: 4132634 (1979-01-01), Rumpf et al.
patent: 4304360 (1981-12-01), Luhr et al.
Perry, Chemical Engineering Handbook, 1963.

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