Ricoh Company, Ltd.

Shinsuke Nagai

Shinya Nakayama

Tsuyoshi Sugimoto

Kohsuke Nagata

Susumu Chiba

Hiroshi Yamada

Akinori Saitoh

Suzuka Amemori

Akihiro Takeyama

Hideyuki Santo

Daisuke Asahina

Ryuta Chiba

Hiroyuki Takeda

Hiroshi Yamashita

Minoru Masuda

Nozomu Tamoto

Yasuo Suzuki

Hitoshi Iwatsuki

Akira Saito

Yasuyuki Yamashita

Masana Shiba

Yuka Mizoguchi

Kiichi Kamoda

Shinzo Higuchi

Sohichiroh Iida

Koh Ohnuma

Suzuka Karato

Takahiro Kadota

Ryuuta Yoshida

Yoshihiko Furugohri

Provided is a resin particle producing method including: a fiber aggregate producing step of directly joining fibers containing a thermoplastic resin with each other to obtain a fiber aggregate; and a particle forming step of forming the fiber aggregate into particles to obtain resin particles.

Resin particle producing method

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 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

A polyester resin for a toner, the polyester resin including: 4,000&#x2266;Weight average molecular weight (Mw)&#x2266;25,000&#x2003;&#x2003; Expression (2); and0.5&#x2266;(Amount of the trivalent or higher aliphatic alcohol)&#x2266;6.5&#x2003;&#x2003; Expression (3),

Polyester resin for toner, toner, developer, and image formation device

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

A toner, wherein the toner has glass transition temperature [Tg1st (toner)] of 20&#xb0; C. to 50&#xb0; C., where the glass transition temperature [Tg1st (toner)] is measured in a first heating in differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has glass transition temperature [Tg2nd (THF insoluble matter)] of &#x2212;40&#xb0; C. to 30&#xb0; C., where the glass transition temperature [Tg2nd (THF insoluble matter)] is measured in a second heating in differential scanning calorimetry (DSC) of the tetrahydrofuran (THF) insoluble matter, wherein the THF insoluble matter has a storage modulus at 100&#xb0; C. [G'(100) (THF insoluble matter)] of 1.0&#xd7;10Pa to 1.0&#xd7;10Pa, and wherein a ratio of a storage modulus of the THF insoluble matter at 40&#xb0; C. [G&#x2032;(40) (THF insoluble matter)] to the storage modulus of the THF insoluble matter at 100&#xb0; C. [G&#x2032;(100) (THF insoluble matter)] is 3.5&#xd7;10 or less.

A toner, including: a polyester resin, wherein the polyester resin includes a diol component and a crosslink component as constituent components thereof, wherein the diol component contains an aliphatic diol having 3 to 10 carbon atoms in an amount of 50 mol % or more, wherein the crosslink component contains a trihydric or higher aliphatic alcohol, and 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 in differential scanning calorimetry (DSC) of the toner.

A magenta toner for electrophotography, including:

Magenta toner, developer, and image forming apparatus

Growing community of inventors

Shizuoka, Japan

Shinsuke Nagai