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US 8,795,938 B2Granted
Toner and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsOsamu Uchinokura, Tomoyuki Satoh, Takahiro Honda, Daisuke Inoue, Mamoru Hozumi
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Abstract
To provide a toner, which contains: toner base particles each containing a binder resin and a colorant; and an external additive containing inorganic particles and fatty acid metal salt particles, wherein the inorganic particles contain at least hydrophobic silica particles, wherein a liberation ratio Ya of the hydrophobic silica particles from the toner is 1% by mass to 20% by mass, and wherein a libration ratio Yb of the fatty acid metal salt particles from the toner is 30% by mass to 90% by mass.
Claims9
A toner, comprising:
- toner base particles each comprising a binder resin and a colorant;
- and
- an external additive comprising inorganic particles and fatty acid metal salt particles,
- wherein the inorganic particles comprise at least hydrophobic silica particles,
- wherein a liberation ratio Ya of the hydrophobic silica particles from the toner is 1% by mass to 20% by mass, and
- wherein a libration ratio Yb of the fatty acid metal salt particles from the toner is 30% by mass to 90% by mass.
3 more elements
Dependencies are inferred from the claim text.