Ricoh Company, Ltd.

Ricoh Technology, Ltd.

Toma Takebayashi

Akio Takei

Hiroshi Yamada

Yasuo Kamada

Akinori Saitoh

Taichi Nemoto

Masahiro Yukikawa

Hiroshi Yamashita

Kazuoki Fuwa

Yuka Mizoguchi

Shizuka Hashida

Junko Yamaguchi

Ryuuta Yoshida

Tomomi Harashima

Maia Kamei

Keisuke Ohta

The present disclosure provides a toner having excellent low-temperature fixing, heat-resistant-storage property, cleaning performance, and filming resistance. A toner containing toner base particles having a crystalline polyester resin and an amorphous polyester resin includes a plurality of organic particles disposed at least partially embedded in a surface of the toner base particles. A percentage of the crystalline polyester resin occupying the surface of the toner base particles is 4% to 20%, a volume average particle size of the organic particles is 10 nm to 40 nm, and a standard deviation of a distance between adjacent particles of the organic particles that are not in contact is 500 nm or less.

Toner, developing agent, toner stored unit, and image forming apparatus

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 particles, each including: a toner base particle including a binder resin, a colorant, and wax; and resin particles on a surface of the toner base particle, wherein Formulae 1 to 3 below are satisfied, where M is a volume average primary particle diameter (nm) of the resin particles, and L is a distance (nm) between the resin particles present next to one another on the surface of the toner base particle:  (Formula 1)5 (nm)<≤60 (nm); and  (Formula 2)0.40≤[(nm)/(nm)]<0.90.  (Formula 3)

Toner and production method thereof, and toner stored 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

Provided is a toner including toner base particles and resin particles. Each toner base particle includes a binder resin, a colorant, and wax. Each resin particle e has a core-shell structure including a core and a shell, where a glass transition temperature TgA of the shell is higher than a glass transition temperature TgB of the core. A surface of each toner base particle is covered with the resin particles. A storage elastic modulus G'1 of the toner at 70° C. during heating is 1.0×10Pa or greater but 1.0×10Pa or less, and a storage elastic modulus G′2 of the toner at 100° C. during heating is 1.0×10Pa or greater but 5.0×10Pa or less, as the toner is measured by a rheometer.

A toner is provided. The toner comprises a binder resin, a colorant, and a release agent. The binder resin comprises a polyester resin comprising a crystalline polyester resin. The crystalline polyester resin forms domains having a number average long diameter of from 0 to 50 nm in a cross-section of the toner. The toner satisfies the following relation:'(50)/&#x2032;(90)&#x2265;6.0&#xd7;10where G&#x2032;(50) and G&#x2032;(90) represent storage elastic modulus of the toner at 50 degrees C. and 90 degrees C., respectively.

Toner, toner accommodating unit, and image forming apparatus

A toner comprising a binder resin is provided. When the toner is observed with an atomic force microscope in tapping mode to obtain a phase image and the phase image is binarized with an intermediate value between maximum and minimum phase difference values in the phase image to obtain a binarized image, the binarized image consists of first phase-contrast portions having a large phase difference and second phase-contrast portions having a small phase difference, where the first phase-contrast portions are dispersed in the second phase-contrast portions and a dispersion diameter of the first phase-contrast portions is in a range of from 150 to 500 nm. The toner has at least two glass transition temperatures (Tg) in respective ranges of from 40&#xb0; C. to 65&#xb0; C. and from &#x2212;30&#xb0; C. to 20&#xb0; C., determined from a DSC curve obtained at a first temperature rise in a differential scanning calorimetric measurement by a midpoint method.

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.

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Shizuoka, Japan

Toma Takebayashi