Ricoh Company, Ltd.

Akihiro Takeyama

Shinya Nakayama

Akinori Saitoh

Shinsuke Nagai

Tsuyoshi Sugimoto

Hideyuki Santo

Kohsuke Nagata

Takahiro Kadota

Hiroyuki Takeda

Minoru Masuda

Hiroshi Yamada

Junichi Watanabe

Suzuka Amemori

Ryuta Chiba

Koh Ohnuma

Suzuka Karato

Ryuuta Yoshida

A toner is provided. The toner includes a resin and a fluorine-containing component. The toner satisfies the following formula:5.0&#x2264;&#x2264;25.0where F(atomic %) represents a content rate of fluorine atom in the toner determined by X-ray photoelectron spectroscopy (XPS) and F(weight %) represents another content rate of fluorine atom in the toner determined by X-ray fluorescence analysis (XRF).

Toner, developer, and image forming apparatus

A toner is provided. The toner includes an amorphous resin, a crystalline resin dispersed in the amorphous resin, and a release agent. The toner satisfies the following inequality:&#x3c;0.8where A represents a perimeter of the crystalline resin and B represents a length of a part of the perimeter A of the crystalline resin at which the crystalline resin is in contact with the amorphous resin, A and B being measured from a cross-sectional image of the toner observed with transmission electron microscope.

Toner, toner storage unit, image forming apparatus, and method for manufacturing toner

A toner, wherein an amount of Al detected in the toner is 0.7% to 1.3%, where the amount of Al detected is determined based on quantitative analysis of Al by X-ray photoelectron spectroscopic analysis (XPS), and wherein [Tg2nd (THF insoluble matter)] is &#x2212;40&#xb0; C. to 30&#xb0; C., where the [Tg2nd (THF insoluble matter)] is a glass transition temperature measured in second heating of differential scanning calorimetry (DSC) of THF insoluble matter of the toner.

A toner, including: base particles containing a polyester resin, a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20&#xb0; C. to 50&#xb0; C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd (THF insoluble matter)] of 30&#xb0; C. or lower where the glass transition temperature [Tg2nd (THF insoluble to matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.

Electrostatic image developing toner, developer, and image forming apparatus

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Kanagawa, Japan

Akihiro Takeyama