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US 12,529,975 B2Granted
Toner, developer, toner storage unit, image forming apparatus, and image forming method
AssigneeRicoh Company, Ltd.
InventorsTaishi Yamashita, Yohichi Kitagawa, Tsukiko Takahashi, Mitsuaki Hirose, Daisuke Inoue
Life of this patent
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Abstract
A toner includes toner particles. Each of the toner particles includes a toner base particle including a binder resin, resin particles covering the toner base particle, and zinc stearate particles serving as an external additive. In each of the toner particles, a coverage rate of the toner base particle with the resin particles is 30% or greater and 70% or less. The zinc stearate particles have a volume average particle diameter of 3 μm or greater and 20 μm or less.
Claims9
A toner comprising:
- toner particles, each of the toner particles including:
- a toner base particle including a binder resin;
- resin particles covering the toner base particle;
- and
- zinc stearate particles serving as an external additive,
- wherein, in each of the toner particles, a coverage rate of the toner base particle with the resin particles is 30% or greater and 70% or less,
- wherein the zinc stearate particles have a volume average particle diameter of 3 μm or greater and 20 μm or less, and
- wherein an amount of zinc released from the toner is 0.005% by mass or greater and 0.06% by mass or less, where the zinc is derived from the zinc stearate particles.
5 more elements
Dependencies are inferred from the claim text.