Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1994-11-28
1996-12-31
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430115, G03G 9135
Patent
active
055893112
ABSTRACT:
Disclosed are negatively and positively charged liquid toners for electrophotography (EP). The charge on the toner particle is obtained by adding cage complex molecules, or clathrates/cryptates, to the liquid toner. The cage complex molecules have at least three chains, with at least one electron pair donor atom in each chain, for a total of at least three electron pair donor atoms (EPD's). Or, the cage complex molecules have at least two connected rings, with a total of at least three EPD's in the molecule including at least one EPD in each of the connected rings. For negatively charged toner particles, the clathrates/cryptates are distributed in the liquid dispersion, and metal cations are weakly associated with anionic functional groups on the toner particle. This way, the clathrates/cryptates in dispersion complex selectively with the cations and strip them from the toner particle, leaving a negatively charged particle. For positively charged toner particles, the clathrates/cryptates are covalently bound to the toner particles, and weakly associated metal cations are added with corresponding anionic species to the liquid dispersion. This way, the clathrates/cryptates on the toner particles complex selectively with the cations, and strip them from the dispersion, creating a positively charged particle.
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Hewlett--Packard Company
Schilling Richard L.
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