| 摘要 |
PROBLEM TO BE SOLVED: To provide a toner for providing high brilliant and high quality images over a long period of time by forming a uniform layer of the toner on a developing roller without any contamination on the developing roller due to an external additive in a developing process, and even in long-term use thereby. SOLUTION: The toner contains toner particles containing at least a binder resin and a coloring agent, inorganic fine powder A having≥80 nm and <300 nm of a number average particle size, and inorganic fine powder B having≥500 nm and <2,000 nm of a number average particle size. An isolation rateα(A) from the toner particles of the inorganic fine powder A is≥20.0 mass% and <40.0 mass%, and an another isolation rateα(B) from the toner particles of the inorganic fine powder B is≥50.0 mass% and <75.0 mass%. COPYRIGHT: (C)2010,JPO&INPIT
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