Ricoh Company, Ltd.

Richoh Company, Ltd.

Hiroyuki Takeda

Hiroshi Yamada

Junichi Awamura

Shinya Nakayama

Akinori Saitoh

Kohsuke Nagata

Shinsuke Nagai

Akihiro Takeyama

Akira Tanaka

Minoru Masuda

Tsuyoshi Sugimoto

Hideyuki Santo

Suzuka Amemori

Yasuo Kamada

Daichi Hisakuni

Ryuta Chiba

Masayuki Ukigaya

A toner is provided. The toner comprises a colorant, a release agent, and a binder resin. The binder resin comprises a crystalline polyester resin and an amorphous polyester resin. The amorphous polyester resin comprises an amorphous polyester resin A and an amorphous polyester resin B. The amorphous polyester resin A comprises an isocyanurate backbone and at least one of urethane bond and urea bond. The amorphous polyester resin B comprises a trimellitic acid backbone and at least one of urethane bond and urea bond.

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

A toner is provided. The toner contains a polyester resin. The toner has a glass transition temperature (Tg1st) at first temperature rising of differential scanning calorimetry (DSC) of from 45&#xb0; C. to 65&#xb0; C. The toner includes a component insoluble in tetrahydrofuran (THF) having two glass transition temperatures (Tga1st and Tgb1st) at the first temperature rising of DSC, where Tga1st is in a range of &#x2212;45&#xb0; C. to 5&#xb0; C. and Tgb1st is in a range of 45&#xb0; C. to 70&#xb0; C. The toner includes a component soluble in THF having a glass transition temperature (Tg2nd) at second temperature rising of DSC of from 40&#xb0; C. to 65&#xb0; C.

Toner, developer, and image forming device

A non-magnetic toner is provided. The non-magnetic toner comprises a polyester resin, a release agent, and a colorant. A storage elastic modulus at 100&#xb0; C. (G'(100&#xb0; C.)) of the toner is from 1.0&#xd7;10to 1.0&#xd7;10Pa, and a storage elastic modulus at 160&#xb0; C. (G&#x2032;(160&#xb0; C.)) of the toner is from 1.0&#xd7;10to 1.0&#xd7;10Pa. A ratio of loss elastic modulus to storage elastic modulus at 100&#xb0; C. (tan &#x3b4;(100&#xb0; C.)) of the toner is greater than that at 130&#xb0; C. (tan &#x3b4;(130&#xb0; C.)), and the tan &#x3b4;(100&#xb0; C.) and the tan &#x3b4;(130&#xb0; C.) are each within the range of from 1 to 2.

Toner, developer, image forming apparatus, and process cartridge

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.

Toner, developer, and image forming apparatus

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

Hiroyuki Takeda