Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1989-01-05
1990-11-20
Martin, Ronald E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430137, 527603, 527605, G03G 9087
Patent
active
049718819
ABSTRACT:
A toner composition for use in electrophotography comprises a rosin modified styrene-acrylic binder resin which has been prepared by steam stripping a mixture solution polymerized styrene acrylic copolymer resin, rosin and a suitable solvent such a toluene or xylene followed by cooling and grinding to form styrene acrylic/rosin binder resin. This binder resin is then formulated with conventional coloring pigments, charge controlling dyes and carriers such as iron powder or glass beads to provide dry toner compositions of high positive charge. An important feature of the present invention is that the styrene acrylic/rosin binder resin will have an inherent positive charge of at least 2.0. This inherent positive charge is in contrast to typical prior art toner binders which are inherently negatively charged. As a result, the toner composition of this invention needs much less of addition of charge control agent to bring the positive charge to the required +10 to +12; thereby leading to far lower manufacturing costs.
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Deets Gary
Zielinski Richard M.
Martin Ronald E.
Monsanto Company
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