Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Process of making developer composition
Patent
1999-03-04
1999-12-14
Martin, Roland
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Process of making developer composition
G03G 9087
Patent
active
060015284
ABSTRACT:
The present invention relates to a process for preparing a toner for electrophotography, which comprises at least the steps of: providing a toner composition solution by mixing a binder resin, a colorant, a charge-control agent and an organic solvent; mixing the resulting toner composition solution with a dispersion solution containing a dispersing agent by utilizing a collision shearing force of beads or using a colloid mill method, thereby obtaining an O/W type emulsion; heating the resulting emulsion so as to eliminate said organic solvent; and obtaining a toner by washing and drying precipitated particles, wherein a viscosity .eta..sub.Z of the toner composition solution and a viscosity .eta..sub.B of the dispersion solution satisfies a specified the relationship between .eta..sub.A and .eta..sub.B.
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Machida Junji
Nagai Yasuki
Martin Roland
Minolta Co. , Ltd.
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