Toner grafting processes

Details Toner grafting processes Toner grafting processes

1996-06-24

1997-07-22

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

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

Post imaging process, finishing, or perfecting composition...

430137, G03G 9087

Patent

active

056502524

ABSTRACT:
A process for the preparation of toner comprising:
(i) preparing a pigment dispersion, which dispersion is comprised of a pigment, an ionic surfactant, and optionally a charge control agent;
(ii) shearing said pigment dispersion with a latex or emulsion blend comprised of resin, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant;
(iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates with a narrow particle size distribution;
(iv) heating said bound aggregates above about the Tg of the resin; and
(v) thereafter washing the toner obtained, adding initiator, adding monomer, polymerizing by heating, and thereafter cooling, followed by an optional second washing.

REFERENCES:
patent: 4983488 (1991-01-01), Tan et al.
patent: 4996127 (1991-02-01), Hasegawa et al.
patent: 5290654 (1994-03-01), Sacripante et al.
patent: 5346797 (1994-09-01), Kmiecik-Lawrynowicz et al.
patent: 5364729 (1994-11-01), Kmiecik-Lawrynowicz et al.

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