Ricoh Company, Ltd.

Yukari Fukuda

Hiroshi Yamashita

Tsuyoshi Sugimoto

Daisuke Asahina

Masana Shiba

Rintaro Takahashi

Satoyuki Sekiguchi

Saki Konno

A toner, including: a binder resin; and a colorant, wherein the toner has a storage modulus of 1.0&#xd7;10Pa or more at 50&#xb0; C., a loss modulus of 8.0&#xd7;10Pa to 2.0&#xd7;10Pa at 80&#xb0; C., and a loss modulus of 2.0&#xd7;10Pa to 1.0&#xd7;10Pa at 160&#xb0; C.

Toner, developer, and color toner set

To provide a toner, which contains a colorant, a binder resin, and a releasing agent, wherein the toner satisfies the following (a) to (c): (a) the toner contains at least a polyester resin as the binder resin; (b) the toner has Tg1st of 25&#xb0; C. to 50&#xb0; C.; and (c) the toner has a TMA compressive deformation rate (TMA %) of 10% or lower at 50&#xb0; C. under a condition having relative humidity of 70%, wherein the Tg1st is glass transition temperature of the toner for first heating, as the toner is measured by a DSC system (a differential scanning calorimeter).

Toner for forming electrostatic image, developer, process cartridge, and image forming apparatus

A yellow toner including: a non-crystalline resin; C.I. Pigment Yellow 185; and a releasing agent, wherein the yellow toner has a glass transition temperature of more than 18&#xb0; C. but less than 40&#xb0; C.

Yellow toner and color image forming method

To provide a toner, which contains: a non-crystalline polyester resin A obtained through a reaction between a non-linear chain reactive precursor and a curing agent, and having a glass transition temperature of &#x2212;60&#xb0; C. to 0&#xb0; C.; a non-crystalline polyester resin B having a glass transition temperature of 40&#xb0; C. to 70&#xb0; C.; and a crystalline polyester resin C, wherein the toner has a glass transition temperature Tg1st of 20&#xb0; C. to 40&#xb0; C. as measured with first heating in differential scanning calorimetry (DSC).

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Kanagawa, Japan

Yukari Fukuda