Ricoh Company, Ltd.

Minolta Company, Ltd.

Konica Minolta Business Technologies, Inc.

Yoshitaka Sekiguchi

Yoshihiro Mikuriya

Masayuki Hagi

Kazuoki Fuwa

Hideaki Yasunaga

Satoshi Ogawa

Hiroyuki Fukuda

Hisashi Nakajima

Masashi Nagayama

Masahiro Anno

Ryota Inoue

Yoshiyuki Shimizu

Shun Saito

Toshikane Nishii

Masayuki Ishii

Makoto Matsushita

Chiyoshi Nozaki

Masayuki Hayashi

Atsushi Yamamoto

Hiroshi Hosokawa

Kazumi Suzuki

Minoru Nakamura

Kenji Kikuchi

Shinji Tamaki

Naoki Nakatake

Shunji Katoh

Tsuyoshi Nozaki

Yoshie Iwakura

Junji Machida

Takayuki Nakamura

Tetsuo Sano

Kenichi Kido

Hiroaki Katoh

Takeshi Arai

Masahide Inoue

Megumi Aoki

Junichi Tamaoki

Saori Yamada

Hiroaki Kato

Chikara Tsutsui

Mariko Takii

Shinya Hanatani

Masahiro Seki

Naoko Kitada

Kohta Sakaya

Mitsuyo Matsumoto

Shunsuke Hamahashi

Shohta Kobayashi

Natsuki Koike

Yoshitaka Yamauchi

Hiroshi Ikeguchi

Michiharu Suzuki

Tomohiro Fukao

Yasushi Akiba

Hiroyuki Yamasaki

Yu Naito

Masaaki Takama

Hideaki Tsukamoto

Masao Nakajima

Satoru Iwata

A resin composition is provided that comprises a resin and a phosphorus-based flame retardant. The resin includes a β-1,3-glucan derivative resin having a main chain having a structure represented by the following structural formula (1): where each of Rs is independently a hydrogen atom or an alkylcarbonyl group, at least one of Rs is an alkylcarbonyl group, and n is a natural number. The phosphorus-based flame retardant has an average particle diameter of 5 μm or less in the resin.

Resin composition, molded article, electronic component, and electronic device

A resin composition is provided. The resin composition comprises an acrylonitrile butadiene styrene resin, a polystyrene resin, a polycarbonate resin, and a phosphorus compound. The amount of the polystyrene resin is equal to or greater than the amount of the acrylonitrile butadiene styrene resin. The amount of the polycarbonate resin is from 70 to 90 parts by mass with respect to 100 parts by mass of all the resins. The phosphorus compound contains a phosphazene compound, and the amount of the phosphazene compound is from 0.1 to 4.0 parts by mass with respect to 100 parts by mass of all the resins.

Resin composition, molded body, electronic part, and electronic device

Provided is a toner including a binder resin, a release agent, and a charge-controlling agent, wherein the toner includes toner particles having particle diameters of 3 micrometers or smaller, among the toner particles having particle diameters of 3 micrometers or smaller, a proportion of the toner particles having an average circularity of 0.70 or greater but 0.85 or less in all of the toner particles is 10% by number or greater but less than 20% by number and a proportion of the toner particles having an average circularity of less than 0.70 in all of the toner particles is 10% by number or less.

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

Provided is a toner including a binder resin, and a charge-controlling agent, wherein a volume average particle diameter X of the toner after a stress treatment satisfies Formula (1), and an amount Y of fine toner particles having particle diameters of 3 micrometers or smaller and circularity of 0.70 or less satisfies Formula (2).

Toner, production method of toner, image forming method, image forming apparatus, and process cartridge

A toner for electrophotography, which contains a binder resin, and a release agent, wherein a maximum value of loss tangent of the toner at 95&#xb0; C. to 115&#xb0; C. is 8 or greater, as a viscoelasticity of the toner is measured, where the loss tangent is represented by the following formula: Loss tangent (tan &#x3b4;)=loss elastic modulus (G&#x2033;)/storage elastic modulus (G').

Toner for electrophotography, image forming method, and process cartridge

A toner including a binder resin, wherein the toner includes a tetrahydrofuran (THF)-insoluble component in a range of from 10% by mass through 40% by mass, wherein the toner has a main peak in a range of from 12,000 through 18,000 in a molecular weight distribution of a THF-soluble component as measured by gel permeation chromatography (GPC), wherein the main peak has a half value width in a range of from 20,000 to 50,000, and wherein the toner includes a component having a molecular weight of 2,000 or less in a range of from 10.0% by mass through 20.0% by mass and a component having a molecular weight of 100,000 or more of 8.0% by mass or less.

Toner, toner stored unit, and image forming apparatus

A toner for developing an electrostatic image, which contains: resin particles (C), wherein the resin particles (C) each contain a resin particle (B) and resin particles (A) or a coating film (P) deposited on a surface of the resin particle (B), where the resin particle (B) contains a second resin (b) and a filler (f), wherein the resin particles (A) or the coating film (P) contains a first resin (a), wherein the second resin (b) contains a crystalline resin, and wherein the resin particle (B) contains the filler (f) in an amount of 15% by mass or greater.

Toner for developing electrostatic image, image forming apparatus, image forming method, and process cartridge

A toner housing container includes a container body housing a toner; a conveying portion conveying the toner from one end of the container body, in a longer direction of the container body, to its other end at which a container opening portion is provided; a pipe receiving port receiving a conveying pipe fixed to a toner conveying device; and an uplifting portion moving the toner toward a toner receiving port of conveying pipe. Such toner has a molecular weight distribution having a peak in a range of 10to 10, and has C/R of from 0.03 to 0.55 between peak height C attributed to crystalline polyester resin and R attributed to non-crystalline resin when measured by FT-IR after stored at 45&#xb0; C. for 12 hours.

Toner housing container and image forming apparatus

A toner, including: a binder resin; and a colorant, wherein the binder resin contains: a crystalline polyester resin (A); a non-crystalline resin (B); and a composite resin (C), where the composite resin (C) contains a condensation polymerization resin unit and an addition polymerization resin unit, wherein the toner contains chloroform insoluble matter in an amount of 1% by mass to 30% by mass, wherein the toner has a molecular weight distribution having a main peak in a range of 1,000 to 10,000 and a half width of 15,000 or less, where the molecular weight distribution is obtained through gel permeation chromatography (GPC) of tetrahydrofuran soluble matter of the toner, and wherein the toner has an endothermic peak in a range of 90&#xb0; C. to 130&#xb0; C. in measurement through differential scanning calorimetry (DSC).

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

A toner, including: a binder resin; releasing agent-encapsulating capsules; and a colorant, wherein the releasing agent-encapsulating capsules each include: a capsule formed of a resin (I) which is different from the binder resin; and a releasing agent (RA) which is encapsulated in the capsule, and the releasing agent-encapsulating capsules exist in the binder resin, and wherein 50% to 100% of the releasing agent-encapsulating capsules exist in a region from a surface of the toner to a depth of 0.10 times a volume-average particle diameter of the toner.

Toner, developer, process cartridge, and image forming apparatus

A toner including a crystalline polyester resin (A), an amorphous resin (B), and a composite resin (C) having a condensation polymerization resin unit and an addition polymerization resin unit is provided. A molecular weight distribution of the toner based on THF-soluble contents thereof has a main peak within a molecular weight range from 1,000 to 10,000 and a half bandwidth of the main peak is 15,000 or less. The molecular weight distribution is determined by gel permeation chromatography. The toner includes chloroform-insoluble contents. A ratio C/R of the toner is within a range from 0.03 to 0.55. C and R represent heights of spectrum peaks specific to the crystalline polyester resin (A) and the amorphous resin (B), respectively, determined by a Fourier transform infrared spectroscopic attenuation total reflection method after the toner is stored in a thermostatic chamber at 45&#xb0; C. for 12 hours.

Toner, image forming method, and process cartridge

A toner including: a base resin; and charge-controlling resin particles contained in the base resin, wherein the toner is in shape of particles, and the charge-controlling resin particles are present in a region of each toner particle which is 500 nm in depth from a surface of the toner particle and an average of amounts of the charge-controlling resin particles present in the regions of the toner particles is 20% by volume to 70% by volume, wherein an average of embedment rates of the charge-controlling resin particles in the toner particles is 90% or higher, where each embedment rate is an average of embedment rates of the charge-controlling resin particles in each toner particle, and wherein the charge-controlling resin particles have a charge amount of 60 &#x3bc;C/mor more as measured by a blow-off method.

Toner, method for producing the same, and image forming apparatus

An image forming apparatus enables a high-quality double-side printing of a transfer medium by one-pass method using a simple structure. A latent image is formed and developed on an image carrier (drum) in a process cartridge. A resultant toner image is transferred by a first transfer unit (roller) onto either an upper surface of the transfer medium or a first intermediate transfer body (roller) in a first transfer area. The toner image on the first intermediate transfer body is transferred onto a back surface of the transfer medium in a fourth transfer area via a second intermediate transfer body (belt) and a third intermediate transfer body (roller). The fourth transfer area is located downstream of the first transfer area along a transport path of the transfer medium.

Double-sided one pass image forming apparatus

An image forming method, including charging the surface of an electrostatic latent image bearer by a charger; irradiating the surface of the electrostatic latent image bearer to form an electrostatic latent image thereon; developing the same with a toner to form a toner image; transferring the toner image onto a recording medium; and fixing the toner image thereon, wherein the charger is a charging roller contacting the electrostatic latent image bearer to charge the same, having a ten-point surface roughness of 5 to 30, and the toner includes a binder resin, a colorant, a release agent and an external additive including a composite oxide including titanium oxide in an amount of 80 to 95% by weight and silicon oxide, having a core-shell structure formed of a core including the titanium oxide and a shell including the silicon oxide and has a BET specific surface area of 50 to 100 m/g.

Image forming method, image forming apparatus and process cartridge

A developing device including a developing roller facing an image bearing member and a toner layer thickness control member to control an amount of a toner adhered to the developing roller, so that an electrostatic latent image formed on the image bearing member is developed with the toner to form a toner image. The following relationships are satisfied: 0.08&#xd7;10&#xd7;Dv&#x3c;Ra&#x3c;0.18&#xd7;10&#xd7;Dv, 2.0&#x3c;(Ra/RSm)&#xd7;100&#x3c;4.0, and 8&#x3c;Rz&#x3c;15, where Dv (&#x3bc;m) is a volume average particle diameter of the toner, Ra (&#x3bc;m) is an arithmetical mean roughness of the developing roller in a longitudinal direction, Rz (&#x3bc;m) is a ten-point mean roughness of the developing roller in a longitudinal direction, and RSm (&#x3bc;m) is a mean length of roughness curve elements of the developing roller.

Developing device, and image forming method and process cartridge using the developing device

Growing community of inventors

Nishinomiya, Japan

Yoshitaka Sekiguchi