| 摘要 |
<p>Disclosed are negatively and positively charged liquid toners for electrophotography (EP). The charge on the toner particle (10', 20') is obtained by adding cage complex molecules (14, 22), or clathrates/cryptates, to the liquid toner. The cage complex molecules (14, 22) 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 (14, 22) 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 (10'), the clathrates/cryptates (14) are distributed in the liquid dispersion, and metal cations (M+) are weakly associated with anionic functional groups (12) on the toner particle. This way, the clathrates/cryptates (14) in dispersion complex selectively with the cations (M+) and strip them from the toner particle, leaving a negatively charged particle (10'). For positively charged toner particles (20'), the clathrates/cryptates (22) are covalently bound to the toner particles, and weakly associated metal cations (M+) are added with corresponding anionic species (24') to the liquid dispersion. This way, the clathrates/cryptates (22) on the toner particles complex selectively with the cations (M+), and strip them from the dispersion, creating a positively charged particle (20'). <IMAGE></p> |
