Ricoh Company, Ltd.

Yuka Mizoguchi

Hiroshi Yamashita

Hideki Sugiura

Minoru Masuda

Shizuka Hashida

Tomomi Harashima

Shinya Nakayama

Hiroshi Yamada

Ryota Inoue

Mio Kumai

Kazuoki Fuwa

Tsuneyasu Nagatomo

Junichi Watanabe

Azumi Miyaake

Daichi Hisakuni

Toshihiko Sugiyama

Tsuyoshi Sugimoto

Taichi Nemoto

Suzuka Amemori

Keiji Makabe

Kohsuke Nagata

Susumu Chiba

Shinsuke Nagai

Toma Takebayashi

Junko Yamaguchi

Suzuka Karato

Yohichi Kitagawa

Maia Kamei

Keisuke Ohta

A toner includes a binding resin; and a metal crosslinking agent that forms a metal crosslinking with the binding resin. A measurement curve of a storage elastic modulus G' in a dynamic viscoelasticity measurement has a maximum value in a range of 100° C. or more.

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

A toner includes a crystalline polyester resin and an amorphous polyester resin. A ratio of the storage modulus of the toner G' (T) at a temperature Tto the storage modulus of the toner G′ (T+3) at a temperature T+3 is greater than or equal to 10, in a case where the temperature Tis within a range from 50° C. to 65° C.

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

A toner for electrostatic charge image development, wherein a spin-spin relaxation time of the toner at 90&#xb0; C. is 0.30 msec or more but 1.50 msec or less, and a spin-spin relaxation time of the toner at 50&#xb0; C. is 0.0185 msec or more but 0.0300 msec or less, the spin-spin relaxation time of the toner at 90&#xb0; C. and the spin-spin relaxation time of the toner at 50&#xb0; C. being obtained by Hahn echo method of pulse NMR analysis.

Toner for electrostatic charge image development, toner stored unit, image forming apparatus, and image forming method

A toner including: a plate-shaped pigment containing a metal as a main component; and a binder resin containing polyester resin (A) that is insoluble in THF, wherein: a weight average molecular weight (Mw) of a tetrahydrofuran (THF)-soluble component of the toner as determined by gel permeation chromatography (GPC) is 5,000 or higher but 14,000 or lower; and a glass transition temperature (Tg) of a THF-insoluble component of the toner as determined from a differential scanning colorimetry (DSC) curve at first heating in DSC is &#x2212;60&#xb0; C. or higher but 10&#xb0; C. or lower.

Toner, toner stored unit, and image forming apparatus

A toner including toner base particles each including a binder resin and a colorant, and external additive, wherein the toner satisfies conditions (a), (b), and (c) below:

Toner, image forming apparatus, image forming method, and process cartridge

An image forming apparatus is provided that includes: first and second electrostatic latent image bearers; first and second electrostatic latent image forming devices; first and second developing devices configured to develop first and second electrostatic latent images with a colored toner and a special-color toner to form a colored toner image and a special-color toner image, respectively; a primary transfer device configured to transfer the colored toner image and the special-color toner image onto an intermediate image bearer in an overlapping manner to form a composite toner image; a secondary transfer device configured to transfer the composite toner image onto a recording medium; and a fixing device configured to fix the composite toner image thereon. The special-color toner comprises plate-like and/or film-like pigments. An absolute difference in volume resistivity between the special-color toner and the colored toner is 0.30 log &#x3a9; cm or less.

Image forming apparatus and toner set

Provided is a toner including at least: a non-crystalline polyester resin; and a crystalline polyester resin, wherein when a cross-section of the toner is observed, the crystalline polyester resin has a maximum length of 100 nm or greater but less than 500 nm, and a ratio Dv/Dn of a volume average diameter Dv of the crystalline polyester resin to a number average diameter Dn of the crystalline polyester resin is less than 1.20.

Toner, toner stored unit, image forming apparatus, and method for producing toner

A toner is provided. The toner includes toner particles each comprising a binder resin and plate-like pigment particles. In a cross-section of the toner, the plate-like pigment particles have an average thickness D of 1.0 &#x3bc;m or less and a maximum length L of 5.0 &#x3bc;m or more. In a fixed toner image formed with the toner, the plate-like pigment particles have a maximum width W of 3.0 &#x3bc;m or more. The toner has a circularity of from 0.950 to 0.985.

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

A toner is provided. The toner comprises a glittering pigment and a coloring pigment. The glittering pigment is disposed inside the toner. The coloring pigment comprises a yellow pigment comprising an isoindoline pigment.

Toner, developer, process cartridge, image forming apparatus, image forming method, and method for manufacturing toner

A toner including: a pigment; polyester resin A that is insoluble in tetrahydrofuran (THF); and polyester resin B that is soluble in THF, wherein the toner satisfies requirements (1) to (3) below:

Toner, developer, and image formation device

Provided is [i] a toner including at least a colorant, a resin, and a releasing agent, wherein a spin-spin relaxation time (t) of the toner at 90&#xb0; C. obtained by Hahn Echo method of pulse NMR analysis is from 1.80 msec to 7.00 msec. Also provided is [ii] a toner according to [i], wherein the spin-spin relaxation time (t) of the toner at 90&#xb0; C. obtained by Hahn Echo method of pulse NMR analysis is from 3.80 msec to 5.90 msec.

Toner and two-component developer

A toner comprised of mother toner particles each including a colorant, a resin A capable of forming a crystalline structure, and a resin B incapable of forming a crystalline structure is provided. The resin A is dispersed in the resin B in the state of phase separation. The long axis of each dispersed particle of the resin A has a length of from 30 to 200 nm and the length ratio of the long axis to the short axis is from 2 to 15. The DSC endothermic quantity attributable to the resin A is from 8 to 20 J/g.

Toner, image forming apparatus, image forming method, process cartridge, and developer

A toner comprised of toner particles including an amorphous resin and a crystalline resin is provided. The coefficient of variation in softening temperature among resin portions in the toner particles is 15% or less when the softening temperature is measured with a scanning probe microscope equipped with a heatable cantilever.

Toner, and developer and image forming apparatus including same

To provide a toner, which contains: a binder resin; a colorant; and wax, wherein the toner has Ta of 30&#xb0; C. to 55&#xb0; C., and Tb&#x2212;Ta of 8&#xb0; C. to 25&#xb0; C., where Ta is a glass transition temperature of the toner determined from a constant heating component of a DSC curve of the toner obtained in a second heating process of temperature modulated differential scanning calorimetry, and Tb is a glass transition temperature of the toner determined from a constant heating component of a DSC curve of the toner obtained in a first heating process of temperature modulated differential scanning calorimetry.

Toner, developer, image forming apparatus, and image forming method

A toner including a binder resin and a colorant, the toner having a core-shell structure containing a core and a shell, wherein the binder resin contains a crystalline polyester resin and a non-crystalline polyester resin, wherein a ratio (A/B) of a mass (A) of the crystalline polyester resin to a mass (B) of the non-crystalline polyester resin is 5/95 to 75/25, and wherein a ratio (Ds/Dc) of a hardness (Ds) of the shell to hardness (Dc) of the core is 1.05 to 1.50 where the hardnesses (Ds) and (Dc) are measured with a scanning probe microscope.

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Shizuoka, Japan

Yuka Mizoguchi