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US 9,791,794 B2Granted
Toner, developer, and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsJunichi Watanabe, Kenji Yoneda, Kohsuke Satoh, Tsuneyasu Nagatomo, Keiji Makabe, Daichi Hisakuni
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Abstract
A toner includes a base particle comprising a crystalline polyester resin; and an external additive which is a group of silica particles having a number-average particle diameter of from 0.01 μm to 0.11 μm on the surface of the toner. A number ratio of the silica particles having a circularity not less than 0.8 is 20% or more in the total number of the silica particles.
Claims9
A toner, comprising:
- a base particle comprising a crystalline polyester resin;
- and
- an external additive which is a group of silica particles having a number-average particle diameter of from 0.01 μm to 0.11 μm on the surface of the toner,
- wherein a number ratio of the silica particles having a circularity not less than 0.8 is from 20% to 49% in the total number of the silica particles.
1 more element
Dependencies are inferred from the claim text.