Ricoh Company, Ltd.

Ricoh Technology, Ltd.

Masahiro Yukikawa

Hiroshi Yamada

Akinori Saitoh

Akio Takei

Toma Takebayashi

Yasuo Kamada

Tomomi Harashima

A toner includes toner base particles and external additives deposited on a surface of the toner base particle. The toner base particle includes an amorphous polyester resin, a crystalline polyester resin, a release agent, and resin particles. An abundance ratio of the crystalline polyester resin in the surface of the toner base particle as observed by TEM is 2.5% or greater but 25% or less. The resin particles are deposited at the surface of the toner base particle as observed by SEM. A ratio of aggregates of the resin particles occupying the surface of the toner base particle is 1% or greater but 70% or less, where R is a major axis of the minimum particle of the resin particles, and the resin particle having a major axis of 3R or greater is determined as the aggregate.

Toner, developer, toner storage unit, image forming apparatus, and image forming method

A toner includes toner base particles each including: a binder resin, a colorant, and wax; and resin particles on surfaces of the toner base particles. A standard deviation of a distance between the resin particles next to each other on the surfaces of the toner base particles is less than 500 nm.

Toner and production method thereof, toner stored unit, image forming apparatus, and image forming method

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Kanagawa, Japan

Masahiro Yukikawa