| 摘要 |
Improved electrostatographic suspension developers contain a pigment coated with polycyanoacrylate. Wherein the polycyanoacrylate comprises an inner shell on a pigment dispersed in an electrically insulating carrier liquid having a volume resistance of at least 109 ohm.cm and a dielectric constant below 3 and the pigment has an additional shell of a copolymer of A. cationic monomers which contain ammonium, phosphonium or sulfonium groups and of which the anions are derived from CH-acid compounds containing at least one C6-C24 hydrocarbon radical and B. radically polymerizable olefinically unsaturated compounds as comonomers. |
