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US 7,608,374 B2Granted
Toner and developer using the toner
AssigneeRicoh Company, Ltd.
InventorMasami Tomita
Life of this patent
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Abstract
A toner including a binder resin, and a release agent, wherein the following relationships are satisfied: 2 μm≦D4≦4 μm (a) 0.05 μm≦Dw≦0.3 μm (b) Dw≦0.075×D4 (c) F≦−40×Dw+19 (d) F≦20×Dw+5 (e) wherein D4 is a weight-average particle diameter of the toner, Dw is an average dispersion diameter of the release agent and F is a pulverizability index of the toner.
Claims13
A toner, comprising:
- a binder resin, and
- a release agent,
- wherein the following relationships are satisfied:
- 2 μm≦D4≦4 μm (d)
- 0.05 μm≦Dw≦0.3 μm (e)
- Dw≦0.075×D4 (f)
- wherein D4 is a weight-average particle diameter of the toner and Dw is an average dispersion diameter of the release agent, and
- wherein the following relationships (1) and (2) are satisfied:
- F≦−40×Dw+19 (1)
- F≦20×Dw+5 (2)
- wherein F is the pulverizability index of the toner.
8 more elements
Dependencies are inferred from the claim text.