Ricoh Company, Ltd.

Jnc Corporation

Naohiro Watanabe

Shigeru Emoto

Hiroshi Yamashita

Chiaki Tanaka

Masahide Yamada

Tsunemi Sugiyama

Masahiro Ohki

Akinori Saitoh

Ryota Inoue

Masami Tomita

Tsuyoshi Sugimoto

Toshiki Nanya

Hiroshi Yamada

Shinichiro Yagi

Osamu Uchinokura

Masaki Watanabe

Yohichiroh Watanabe

Junichi Awamura

Naohito Shimota

Satoshi Kojima

Masanori Suzuki

Masayuki Ishii

Daisuke Inoue

Shinichi Wakamatsu

Takeshi Takada

Sonoh Matsuoka

Tadao Takigawa

Takuya Saito

Tsuneyasu Nagatomo

Shinya Hanatani

Mamoru Hozumi

Tadao Takikawa

Ryohta Inoue

Masana Shiba

Kei Naitoh

Satoshi Ogawa

Tomomi Suzuki

Shingo Sakashita

Rintaro Takahashi

Tomoyuki Sato

Eiji Sawamura

Tomoyuki Satoh

Takayuki Yoshii

Kazuyuki Hirai

Kazushige Yasumatsu

Hiroto Higuchi

Yasuaki Iwamoto

Fumihiro Sasaki

Takahiro Honda

Takayuki Itoh

Mikio Yamahiro

Kazuhito Watanabe

Hyo Shu

Tomoki Murayama

Akio Takei

Ryuuta Yoshida

Kiwako Hirohara

Yoshitsugu Kimura

Ayumi Satoh

Kenya Itoh

Kazushige Sanyo Chemical Ind Ltd Yasumatsu

Kazuyuki Sanyo Chemical Industries Ltd Hirai

A toner includes a binder resin; a release agent; and two or more inorganic fine particles as external additives. At least one of the inorganic fine particles is silica. When an ultrasonic oscillation is applied to a dispersion including the toner and a dispersant and a rate of the silica releasing from the toner is 20% based on total silica, an application energy of the ultrasonic oscillation is from 8 to 14 kJ, and from 70 to 130 kJ when the rate of the silica releasing from the toner is 50%.

Toner, developer, toner housing unit and image forming apparatus

A toner comprising a binder resin and a release agent, wherein the toner has a difference of 30 or less between a maximum value and a minimum value among peak intensities in a range of Molecular weight M&#xb1;300 where Molecular weight M is a molecular weight selected from a range of from 300 through 5,000 in a molecular weight distribution of tetrahydrofuran (THF)-soluble components in the toner as measured by gel permeation chromatography (GPC), and wherein the peak intensities are defined as relative values assuming a maximum peak value in molecular weights of 20,000 or less is 100, in a molecular weight distribution curve taking an intensity as a vertical axis and a molecular weight as a horizontal axis as measured by GPC.

Toner, toner stored unit, and image forming apparatus

To provide a toner, containing: a binder resin; a colorant; a releasing agent; and a crystalline polyester resin, wherein the toner satisfies the following formulae (1) to (3): 40&#xb0; C.&#x2266;X&#x2266;55&#xb0; C. Formula (1) 85&#xb0; C.&#x2266;Y&#x2266;92&#xb0; C. Formula (2) 35&#xb0; C.&#x2266;Y&#x2212;X&#x2266;50&#xb0; C. Formula (3) where X is an onset temperature and Y is an endset temperature of an endothermic peak on a differential scanning calorimetry (DSC) curve of the toner as measured by a differential scanning calorimeter (DSC).

Toner and developer

A toner set, including: at least one chromatic toner containing a colorant; and a transparent toner containing no colorant, wherein the chromatic toner and the transparent toner each include a releasing agent and a binder resin, and wherein an amount of a tetrahydrofuran insoluble matter in the transparent toner is smaller than an amount of a tetrahydrofuran insoluble matter in the chromatic toner.

Toner set, developer set, and image forming apparatus

The present invention provides a toner containing at least a binder resin and a pigment, wherein the amount of the pigment in the toner is 3.0% by mass to 8.5% by mass, the volume average particle diameter of the toner is 2.0 &#x3bc;m to 6.0 &#x3bc;m, and a monochrome image, which has been fixed on a recording medium so that the amount of the toner adhered onto the recording medium is 0.25 mg/cm, has a reflection density of 1.2 to 2.5.

Toner, developer, and image forming method

A toner including base particles each containing a crystalline polyester and a non-crystalline polyester, wherein the toner has a glass transition temperature of 45&#xb0; C. or higher where the glass transition temperature is determined from a DSC curve of the toner obtained in the first elevation of temperature thereof, and wherein the toner has a temperature width of 8&#xb0; C. or lower where the temperature width is a temperature width at &#x2153; the height of an endothermic peak attributed to the crystalline polyester in the DSC curve.

Toner and method for producing the same

An electrostatic image developing toner including: a binder resin; a colorant; and a wax, wherein the intensity ratio of an absorbance at 2,850 cmderived from the wax to an absorbance at 828 cmderived from the binder resin, represented by 'absorbance derived from the wax/absorbance derived from the binder resin', is in the range of 0.1 to 0.5, where the absorbances are measured by FTIR-ATR, and the intensity ratio serves as a value for determining the amount of the wax present within 0.3 &#x3bc;m in depth from surfaces of particles of the toner after the toner has been heated to 140&#xb0; C. and then cooled, and wherein the toner has a storage elastic modulus of 5,000 Pa or greater at 140&#xb0; C.

Electrostatic image developing toner

To provide a toner, containing: a binder resin; a crystalline polyester resin; a colorant; and wax, wherein the toner has a fluidized powder characteristic value of 35% to 45%, and a BET specific surface area of 2.8 m/g to 4 m/g, and wherein the toner has an intensity ratio P2850/P828 of 0.10 to 0.20, where P2850 is an intensity of a peak at 2850 cmwhich is attributed from the wax and the crystalline polyester resin, and P828 is an intensity of a peak at 828 cmwhich is attributed from the binder resin, as measured by total reflectance infrared spectroscopy.

Toner, production method thereof, developer and image forming method

A toner containing toner particles, each toner particle containing: a releasing agent; a colorant; and a binder resin containing at least a crystalline polyester resin and a non-crystalline polyester resin, wherein in the case where a volume average particle diameter of the toner is defined as Dv, the toner contains a group of the toner particles having 4/5 Dv, and a group of the toner particles having 6/5 Dv, and wherein an endothermic value A of the crystalline polyester resin at a first temperature increase in DSC of the toner, an endothermic value B of the crystalline polyester resin at a first temperature increase in DSC of the group of the toner particle having 4/5 Dv, and an endothermic value C of the crystalline polyester resin at a first temperature increase in DSC of the group of the toner particles having 6/5 Dv satisfy the relation represented by the following formulas:50&#x3c;()&#xd7;100&#x3c;90, and110&#x3c;()&#xd7;100&#x3c;150.

Toner, developer, image forming method and image forming apparatus

A toner including at least one polyester resin serving as a binder resin, a colorant, a releasing agent, and a fixing aid, wherein the fixing aid includes a fatty acid amide-based compound, and the fatty acid amide-based compound is at least one of a fatty acid amide compound having a mono- or higher valent amide bond and a fatty acid amide-based compound having a mono- or higher valent amino group or a hydroxyl group.

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

A toner according to the present invention contains at least a polyester resin as a binder resin, a colorant, a releasing agent, a fixing-assisting component, and a fatty acid, wherein the fixing-assisting component has a melting point of 60&#xb0; C. to 120&#xb0; C. and contains at least one of an esterified compound obtained by esterification of the fatty acid and an amide compound obtained by amidation of the fatty acid.

Toner, developer, toner container, process cartridge, and image forming method

A toner produced by a method including dissolving or dispersing toner components comprising a colorant and at least one of a binder resin and a precursor thereof in an organic solvent to prepare a toner components liquid, dispersing the toner components liquid in an aqueous medium including a surfactant, a particulate resin A having the same polarity as the surfactant and a volume average particle diameter of from 5 to 50 nm, and a particulate resin B having a volume average particle diameter of from 10 to 500 nm to form liquid droplets, and removing the organic solvent from the liquid droplets. The particulate resin B is incompatible with the binder resin and swells in the organic solvent.

Toner, image forming method, and process cartridge

A toner containing: a non-crystalline polyester resin; a crystalline polyester resin; a releasing agent; a graft-modified polymer; and a colorant, wherein the graft-modified polymer is a polymer having a glass transition temperature of higher than 40&#xb0; C. but lower than 80&#xb0; C., and obtained by grafting an acrylic resin onto at least one of a hydrocarbon wax and a crystalline polyester resin, and wherein a SP value of the non-crystalline polyester resin is defined as SP1, a SP value of the crystalline polyester resin is defined as SP2, a SP value of the releasing agent is defined as SP3, and a SP value of the graft-modified polymer is defined as SP4, and SP1, SP2, SP3 and SP4 satisfy relations represented by Formulas (1) to (3): 

Disclosed is a resin particle having a volume average particle diameter of 10 nm to 500 nm, obtained by polymerizing an addition polymerizable monomer containing a silsesquioxane (a) represented by Formula (I) or by copolymerizing the silsesquioxane (a) with an addition polymerizable monomer (b),  where Rto Reach independently represent a group selected from the group consisting of hydrogen, alkyl having 1 to 40 carbon atoms, substituted or unsubstituted aryl, and substituted or unsubstituted arylalkyl; any hydrogen in the alkyl group is optionally substituted by fluorine and any &#x2014;CH&#x2014; is optionally substituted by &#x2014;O&#x2014;, &#x2014;CH&#x2550;CH&#x2014;, cycloalkylene or cycloalkenylene; any hydrogen in alkylene in the arylalkyl group is optionally substituted by fluorine and any &#x2014;CH&#x2014; is optionally substituted by &#x2014;O&#x2014; or &#x2014;CH&#x2550;CH&#x2014;; and Arepresents an addition polymerizable functional group.

Resin particle, toner, and image forming method and process cartridge using the same

A magenta toner, produced by a method including suspending an oily liquid comprising a binder resin and a colorant in an aqueous medium, wherein the colorant comprises a naphthol pigment and a quinacridone pigment, and the quinacridone pigment comprises a pigment having a specific formula.

Magenta toner and developer

Growing community of inventors

Shizuoka-ken, Japan

Naohiro Watanabe