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AssigneeRicoh Company, Ltd.
InventorsNoboru Kuroda, Tomoyuki Satoh, Yasushi Nakamura, Nobutaka Kinoshita, Masahiro Kawamoto, Shigeru Emoto, Osamu Kouzu
Estimating the term…
A toner for developing an electrostatic image, including a binder, a coloring agent and a charge controlling agent. When that portion of the toner which has a particle diameter of 5.04 μm or less accounts for 15-60% of the total number N of the toner, that portion of the toner which provides a number average particle diameter of 4.0 to 4.5 μm has such a content C1% by weight of the charge controlling agent that gives a ratio of C1/CT of 1.00 to 1.10, where CT is a total amount, in terms of % by weight, of the charge controlling agent in the toner. When that portion of the toner which has a particle diameter of 5.04 μm or less accounts for 15% or less of the total number N, that portion of the toner which provides a number average particle diameter of 4.2 to 4.8 μm has such a content C2% by weight of the charge controlling agent that gives a ratio of C2/CT of 1.02 to 1.15.
A toner for developing an electrostatic image, comprising a binder, a coloring agent and a charge controlling agent and having the following characteristics (a), (b), (c), (d) and (e):
A toner for developing an electrostatic image, comprising a binder, a coloring agent and a charge controlling agent and having the following characteristics (a), (b′), (c), (d) and (e′):
Dependencies are inferred from the claim text.