| 摘要 |
Toners comprised of a resin and a quaternary ammonium compound of the formula <IMAGE> in which at least two R radicals are hydrocarbon radicals having from about 8 to about 22 carbon atoms and each other R is a hydrogen or hydrocarbon radical having from 1 to about 8 carbon atoms, and A is an anion for example, sulfate, sulfonate, nitrate, borate, chlorate, and the halogens such as iodide, chloride, and bromide. Methods of their formation and use in various electrophotographic imaging systems is disclosed. The quaternary ammonium compound is generally present as a coating on a pigment that is used in the toner, such pigment being for example carbon black. Toners containing the above described quaternary ammonium compounds generally result in a toner containing a positive charge thus allowing development of negative images that may be formed on photoreceptors, especially organic photoreceptors. A developer composition comprising the above ingredients together with a carrier such as steel were found suitable for use in developing electrostatic latent images.
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