Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Process of making developer composition
Patent
1995-01-17
1996-03-26
Martin, Roland
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Process of making developer composition
G03G 9087, G03G 908
Patent
active
055019358
ABSTRACT:
A process for the preparation of toner compositions consisting essentially of
(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) subsequently adding further anionic or nonionic surfactant solution to minimize further growth in the coalescence (v); and
(v) heating said bound aggregates above about the Tg of the resin and wherein said heating is from a temperature of about 103.degree. to about 120.degree. C., and wherein said toner compositions are spherical in shape.
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patent: 5344738 (1994-09-01), Kmiecik-Lawrymowicz et al.
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patent: 5370963 (1994-12-01), Patel et al.
patent: 5370964 (1994-12-01), Patel et al.
Gerroir Paul J.
Hopper Michael A.
Kmiecik-Lawrynowicz Grazyna E.
Patel Raj D.
Martin Roland
Palazzo E. O.
Xerox Corporation
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