Ricoh Company, Ltd.

Sanyo Chemical Industries, Ltd.

Satoshi Mochizuki

Hideki Sugiura

Yasuo Asahina

Shinya Nakayama

Tomoyuki Ichikawa

Yasuaki Iwamoto

Koichi Sakata

Akihiro Kotsugai

Kazuhiko Umemura

Hisashi Nakajima

Tomoko Utsumi

Osamu Uchinokura

Fumihiro Sasaki

Tomomi Tamura

Minoru Masuda

Masayuki Ishii

Tomomi Suzuki

Kohsuke Suzuki

Masami Tomita

Shinichiro Yagi

Naohito Shimota

Takuya Saito

Hiroaki Matsuda

Hiroshi Yamada

Tatsuya Niimi

Masahide Yamashita

Hiroto Higuchi

Hitoshi Iwatsuki

Sonoh Matsuoka

Hidetoshi Noda

Hiroshi Yamashita

Hajime Oyama

Tomio Kondou

Kiyonori Tsuda

Kousuke Suzuki

Shigeru Emoto

Junichi Awamura

Toshiki Nanya

Takahiro Honda

Seiji Oka

Takayuki Koike

Tadao Takikawa

Toshihiko Kinsho

Takahisa Kato

Shuhei Yahiro

Hidefumi Gohhara

Kohichi Sakata

Masanori Suzuki

Yohichiroh Watanabe

Ryota Inoue

Tsunemi Sugiyama

Akiyoshi Sabu

Shingo Sakashita

Tsuneyasu Nagatomo

Yukiko Nakajima

Yasushi Akiba

Takeshi Takada

Kohki Katoh

Keiko Osaka

Tohru Suganuma

Susumu Kawakami

Hironori Hata

Tsuyoshi Fukushima

Yutaka Sakai

Yutaka Yoshida

Norio Yokoyama

Megumi Sakakura

Koutaro Kitano

Tamoe Sasaki

Tadao Sanyo Chemical Industries Ltd Takikawa

Hidetoshi Sanyo Chemical Industries Ltd Noda

Toshihiko Sanyo Chemical Industries Ltd Kinsho

Shuhei Sanyo Chemical Industries Ltd Yahiro

Naohito Bell Shine Takehara A-103 Shimota

Tomoyuki Dai6 Sumika Bldg 206 Ichikawa

Koichi Takashimahoncho M's 503 Sakata

Toshihiko c/o Sanyo Chemical Ind Ltd Kinsho

Hidetoshi c/o Sanyo Chemical Ind Ltd Noda

Yutaka c/o Sanyo Chemical Ind Ltd Yoshida

Shuhei c/o Sanyo Chemical Ind Ltd Yahiro

Tadao c/o Sanyo Chemical Ind Ltd Takikawa

Shinya Grand River Ave 201 Nakayama

Tomoko Green Grass Utsumi

Masami Pasco Grand Mansion Shinnumazu 302 Tomita

Shinya Grand River A 201 Nakayama

Shinya Gran River Avenue 201 Nakayama

A toner including a binder resin comprising a resin (a) comprising a polyhydroxycarboxylic acid skeleton formed from an optically-active monomer. The polyhydroxycarboxylic acid skeleton has a weight average molecular weight of from 7,000 to 60,000. The binder resin comprises the polyhydroxycarboxylic acid skeleton in an amount of from 10 to 90% by weight. The optical purity X (%) of the polyhydroxycarboxylic acid skeleton represented by the following formula is 80% or less:(%)=|(-isomer)&#x2212;(-isomer)|wherein X(L-isomer) and X(D-isomer) represent molar ratio (%) of L-isomer and D-isomer of the optically-active monomer, respectively.

Toner, color toner set, developer, process cartridge, and image forming method

There is provided a toner which contains at least a binder resin, and filler including a layered inorganic compound, wherein the layered inorganic compound is cleaved to form particles in the toner, and the particles have a breadth of 0.5 nm to 4 nm, and a length of 10 nm to 90 nm.

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

The object of the invention is to provide a toner enabling excellent transferring properties, cleanability, and fixability and forming a high-precision image without substantially degraded image quality even after printed on a number of sheets of paper. The invention also provides the toner-production method, an image forming apparatus, an image forming method, and a process cartridge. To this end, the present invention provides a toner which comprises toner-base particles containing a binder resin and a filler, and inorganic fine particles, in which the filler is included in a filler-layer in the vicinity of surfaces of the toner-base particles, the number average particle diameter of the primary particles of the inorganic fine particles is 90 nm to 300 nm, and the average circularity of the toner is 0.95.

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

A toner including toner particles including a binder resin, a colorant, and an inorganic particulate material present on a surface of the toner particles. The toner particles have a surface roughness (Ra) of from 1 to 30 nm, a standard deviation of the surface roughness of from 10 to 90 nm and include 1 to 20 convexities per 1 &#x3bc;m, which have a height not less than 10 nm.

Toner, developer, image developer and image forming apparatus

The present invention provides a method for producing a toner including preparing an emulsified dispersion which contains emulsion particles by emulsifying or dispersing an oil phase containing at least a pigment and any one of a binder resin and a binder resin precursor in an aqueous medium, and granulating toner base particles by converging the emulsified dispersion, wherein the Casson yield value of the single oil phase before being emulsified or dispersed in the aqueous medium is 0.5 Pa to 20 Pa; and the temperature Tn of the emulsified dispersion in the preparation of the emulsified dispersion, the temperature Ts of the emulsified dispersion in the granulation of the toner base particles, and the glass transition temperature Tg of the toner base particles satisfy the relation Tn&#x3c;Ts&#x3c;Tg.

Toner, toner production method, and image forming method

A toner including a binder resin; and a colorant, wherein a hexafluoroisopropanol (HFIP)-soluble component satisfies the following relationship:2,000 &#x2266;Mn &#x2266;7,000 and 1.5 &#x2266;Mn/Mw &#x2266;10

Toner, developer, image forming apparatus and image forming method

An external additive for a toner for electrophotography which contains oxide fine particles which contain silicon, in which the oxide fine particles have a primary particle diameter of 30 nm to 300 nm in number average, a standard deviation &#x3c3; of a particle size distribution of the primary particle diameter satisfies a relation of: R/4&#x2266;&#x3c3;&#x2266;R, in which the R expresses the primary particle diameter, the oxide fine particles are substantially spherical having a circularity SF1 defined as equation (1) of 100 to 130 and a circularity SF2 defined as equation (2) of 100 to 125;1=()&#xd7;(&#x3c0;/4)&#xd7;100&#x2003;&#x2003;equation (1)2=()&#xd7;(1/4&#x3c0;)&#xd7;100&#x2003;&#x2003;equation (2),in the equations, 'L' expresses the absolute maximum length of the oxide fine particles; 'A' expresses a projected area of the oxide fine particles; and &#x201c;P&#x201d; expresses a maximum perimeter of the oxide fine particles.

External additive for toner for electrophotography, toner for electrophotography, double-component developer for electrophotography, image-forming process using the toner, and image-forming apparatus using the toner

To provide an image forming method including forming a latent electrostatic image on a latent electrostatic image bearing member, developing the latent electrostatic image using a toner to form a visible image, transferring the visible image to a recording medium, and fixing a transfer image transferred on the recording medium, wherein the toner includes a toner base particle containing at least a binder resin, a colorant and an inorganic fine particle, and a charge control agent; and wherein the condition X&#x3e;Xis satisfied (where Xis an average proportion of the inorganic fine particles in a near-surface region of the toner base particle, Xis an average proportion of inorganic fine particles in the whole toner base particle.

Image forming method and image forming apparatus

A toner is provided containing a parent particulate material, which contains; 

Toner for developing electrostatic latent image, developer using the toner, and process cartridge, image forming apparatus and image forming method using the developer

To provide a toner that can provide long-term removability and high-definition images with reduced image layer thickness and densely-packed toner particles, a developer capable of forming high-quality images using the toner, a toner container for containing the toner, a process cartridge using the toner, an image forming apparatus using the toner, and an image forming method using the toner. The toner of the present invention is a toner having a substantially spherical shape with irregularities on its surface and containing at least a binder resin and a colorant, wherein a surface factor SF-1 that represents the sphericity of toner particles is 105 to 180, a surface factor SF-2 that represents the degree of surface irregularities of the toner particles is correlated with the volume-average diameter of the toner particles, and the toner particles have an inorganic oxide particle-containing layer within 1 &#x3bc;m from their surfaces.

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

A toner which is negatively charged to develop an electrostatic latent image is provided that contains a colorant; and a binder resin, wherein the toner has an acid value of from 5 to 20 mg KOH/g and an amine value of from 0.5 to 10 mg KOH/g.

Toner, and developer, image developer and image forming apparatus using the toner

A toner which includes a toner material, wherein the toner satisfies the following formula:0&#xb0; C.&#x2266;&#x394;Tm&#x2266;20&#xb0; C.

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

It is an object of the present invention to provide a toner that can sustain favorable transferability and cleaning ability for prolonged periods; prevent photoconductor filming; exhibit no variation in image nonuniformity or external additive immersion induced by developer agitation at the time of use; excels in stability with flowability and charge stability over prolonged periods. Therefore, provided is the toner of which the quantity of aggregate of residual external additives found on the sieve of 635-mesh and 452 cmof mesh area, after 0.2 g of the toner on the sieve is blasted with air at a blow pressure of 0.2 MPa from 160 mm above the sieve while being air-suctioned at a suction force of 5 mmHg, and then air-suctioned at a suction force of 20 mmHg, is 4,500 or less and 5 or more.

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

An image forming method including: forming a toner image on a support using a toner including toner particles; and feeding the support bearing the toner image thereon through a nip between an endless toner heating member and a pressure roller to fix the toner image on the support, wherein the endless toner heating member is rotated while stretched by a fixing roller and a heat roller which includes a magnetic metal and which is heated by electromagnetic induction, and wherein the pressure roller presses the support to the endless toner heating member and the fixing roller at the nip, wherein the toner particles are prepared by a polymerizing method using a binder resin containing at least a modified polyester resin.

Image forming method using toner

An external additives for electrophtographic toner comprising finely divided oxide particulate including a silicon compound and a compound for doping said oxide particulate, wherein particle diameter of the primary particle of said finely divided oxide particulate is in the range of 30 nm to 150 nm, and the primary particle of said finely divided oxide particles is substantially spherical shape having the roundness in the range of 0.95 to 0.996, is provided. And this external additives is capable of evading from the embedding of external additives into toner even if after the toner is held in the storage under the condition of high temperature and high humidity, thereby the additives is capable of showing sufficient functions as fluidizing agent and charge supplement agent, and is capable of inhibiting an abnormal charge elevation even after being stored under the low temperature and low humidity.

External additives for electrophotographic toner, electrophotographic toner, electrophotographic developer, image forming method and image forming apparatus

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Numazu, Japan

Satoshi Mochizuki