Ricoh Company, Ltd.

Sumitomo Electric Industries, Limited

Agency of Industrial Science and Technology

Masayuki Ishii

Chiaki Tanaka

Tomoyuki Ichikawa

Shinya Nakayama

Hideki Sugiura

Koichi Sakata

Yasuo Asahina

Satoshi Mochizuki

Hisashi Nakajima

Yasuaki Iwamoto

Osamu Uchinokura

Akihiro Kotsugai

Tomoko Utsumi

Takuya Saito

Masami Tomita

Ryota Inoue

Keizo Harada

Naohiro Watanabe

Hiroto Higuchi

Toyoshi Sawada

Fumihiro Sasaki

Nobuhiko Fujita

Shingo Sakashita

Hiroshi Yamada

Shigeru Emoto

Hitoshi Iwatsuki

Shinichiro Yagi

Yoshitaka Sekiguchi

Satoshi Ogawa

Takahiro Honda

Hiroshi Yamashita

Takuya Seshita

Shosaku Yamanaka

Kei Naitoh

Yoshihiro Moriya

Kenichi Watanabe

Junichi Awamura

Toshiki Nanya

Naohito Shimota

Tomomi Suzuki

Tsuneyasu Nagatomo

Tadashi Tomikawa

Hajime Hitotsuyanagi

Kohtaroh Ogino

Tunenobu Kimoto

Hiroshi Yoshino

Naoko Kitada

Shohta Kobayashi

Shoji Nakagama

Hidetoshi Kami

Kazuhiko Umemura

Yoshitaka Yamauchi

Tomoharu Asano

Tomohiko Ihara

Hyo Shu

Shinya Hanatani

Sonoh Matsuoka

Takao Maeda

Satoru Okamoto

Shunsuke Ban

Masaaki Honda

Shohichi Sugimoto

Tadashi Igarashi

Tetsuya Nishi

Kohichi Sakata

Masayuki Kakimoto

Tadakazu Kobayashi

Ayaka Mori

Nahiro Watanabe

Naohito Bell Shine Takehara A-103 Shimota

Tomoyuki Dai6 Sumika Bldg 206 Ichikawa

Koichi Takashimahoncho M's 503 Sakata

Shinya Grand River Ave 201 Nakayama

Masami Pasco Grand Mansion Shinnumazu 302 Tomita

Shinya Grand River A 201 Nakayama

A toner includes: a crystalline polyester resin; and a partially hydrogenated petroleum resin. A hydrogenation rate of the partially hydrogenated petroleum resin is from 30% through 70%. An amount of the partially hydrogenated petroleum resin relative to the toner is from 1% by mass through 15% by mass.

Toner

An electronic device includes: a support; a charge-transporting layer including a charge-transporting material, or a sensitizing-dye electrode layer including a sensitizing dye, where the charge-transporting layer or the sensitizing-dye electrode layer is disposed on or above the support; and a metal oxide layer disposed on or above the charge-transporting layer or the sensitizing-dye electrode layer. The metal oxide layer includes p-type semiconductor metal oxide and silica or metal oxide particles, and an amount of the silica or metal oxide particles included in the metal oxide layer is 0.5% by mass or greater but 1.5% by mass or less, relative to the metal oxide layer.

Electronic device and method for producing the same, image forming method, and image forming apparatus

A toner comprising base particles and external additive particles covering the base particles is provided. The base particles comprise a binder resin and a colorant. The external additive particles comprise at least one member selected from the group consisting of fluorine-containing aluminum hydroxide, fluorine-containing boehmite, and fluorine-containing pseudoboehmite.

Toner, toner accommodating container, developer, developing device, process cartridge, image forming apparatus, and image forming method

A toner is provided which includes: a toner base particle including a binder resin; and an external additive including inorganic particles. A particle size distribution of primary particles of the inorganic particles has a plurality of peaks in the range of from 5 nm through 50 nm. The particle size distribution of the primary particles satisfies all of expressions (1) to (3) below:12&#x2003;&#x2003;(1);10&#x3c;(12)&#x2003;&#x2003;(2); and30&#x2264;{(21)&#xd7;100}&#x3c;100&#x2003;&#x2003;(3),

Toner, developer, toner stored unit, image forming apparatus, image forming method, and printed matter producing method

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

An external additive for toner that contains a resin particle and two or more kinds of particulates having different compositions present on the resin particle.

External additive for toner, toner covered with external additive, development agent, toner container, and image forming apparatus

Toner contains a mother toner particle containing a binder resin and a coloring agent and an external additive to cover the mother toner particle, wherein the external additive contains a resin particle, wherein the resin particle has an outer shell layer formed of silica or modified silica, wherein the resin particle has a non-spherical form with a shape factor (SF) of 1.20 or greater as calculated by the following relationship 1,Shape factor(SF)=[(Absolute maximum length of particle)/Projected area of particle)]&#xd7;(&#x3c0;/4)&#x2003;&#x2003;Relation 1.

Toner, development agent, toner container, and image forming apparatus

A toner for use in developing an electrostatic latent image is provided. The toner includes a colored particulate material including at least a binder resin and a colorant; and an external additive present on a surface of the colored particulate material and including a particulate crystalline hydroxyapatite. The particulate crystalline hydroxyapatite has an average aspect ratio of not less than 3 and less than 30.

Toner, and developer, image forming method and process cartridge using the toner

A toner including a mother particle and an external additive covering a surface of the mother particle is provided. The mother particle includes a binder resin, a colorant, and a release agent. The external additive includes a particulate cellulose having a number average particle diameter within a range of 15 to 105 nm.

Toner, developer, image forming apparatus, and process cartridge

A toner is provided including a mother particle and an external additive covering the surface of the mother particle. The mother particle includes a binder resin and a release agent. The external additive includes a hydroxyapatite silica complex porous particle having a number average particle diameter of 160 nm or less.

Toner, developer, and method of manufacturing toner

The present invention provides an organic silicone fine particle for latent electrostatic image developing toners, wherein the organic silicone fine particle has a volume average particle diameter of 0.05 &#x3bc;m to 6.0 &#x3bc;m which is obtained by measurement based on Coulter principle, and has a hemispherical polysiloxane cross-linked structure. By mixing an appropriate amount of an organic silicone resin particle formed in a deformed shape (a hemispherical shape) in a toner or developer, the present invention prevents movement of the organic silicone resin particle from surface functional sites, the movement caused by a phenomenon such as detachment thereof from a toner surface or rolling movement on the toner surface, by the effect of its shape, and makes it possible to effectively achieve the expected function.

Fine organic silicone particle for latent electrostatic image developing toners, external additive for toners, toner for developing latent electrostatic image, and two-component developer

To provide a method for producing a carrier including treating a coating layer on a surface of a core material with a polymer precursor in a supercritical fluid and/or a subcritical fluid so as to add the polymer precursor to the coating layer, and subjecting the coating layer to oxidation treatment so as to form a polymer from the polymer precursor in the coating layer, and a carrier produced by the method.

Carrier and method for producing the same, developer and image forming method

A method for preparing a particulate image forming material such as toner, which includes providing a particulate material including a chain transfer agent; and contacting the particulate material with at least one of a supercritical fluid and a sub-critical fluid under pressure to remove the chain transfer agent from the particulate material. A toner prepared by the method. A toner container containing the toner. A developer including the toner. An image forming method including preparing an electrostatic latent image and developing the latent image with the developer. An image forming apparatus including an image bearing member configured to bear an electrostatic latent image, a developing device configured to develop the electrostatic latent image with the developer to form a toner image on the surface of the image bearing member, a transfer device, a fixing device, and a cleaner configured to clean the image bearing member.

Method for preparing resin and particulate material, toner prepared by the method, developer including the toner, toner container, and process cartridge, image forming method and apparatus using the developer

The present invention provides a method for producing a carrier that includes dissolving at least a coating material in carbon dioxide in a liquid state, and forming a coating layer on a core material surface by reducing the solubility of the liquid with at least the coating material dissolved therein through control of at least any one of the pressure and temperature. The present invention also provides a carrier produced by the method for producing a carrier.

Carrier, method for producing the same, developer, and image forming method

Growing community of inventors

Numazu, Japan

Masayuki Ishii