| 摘要 |
An object of the present invention is to provide an electrophotographic developer having a good fluidity, an excellent shelf stability, and a lesser reduction in image quality under various conditions. An electrophotographic one component nonmagnetic developer includes toner particles obtained by polymerizing a polymerizable monomer component, such as styrene, methacrylate, acrylate and the like, and outer-additives, such as silicon dioxide particles, on the toner particles. The developer has pH of 4 to 7 measured by a decoction method, and sigma 2 of not more than 20 mu S/cm and sigma 2 - sigma 1 of 0 to 10 mu S/cm, in which sigma 1 is an electric conductivity of water, sigma 2 is an electric conductivity measured by a decoction method.
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