Ricoh Company, Ltd.

Other

Shin-etsu Chemical Co., Ltd.

Mitsui Petrochemical Industries, Ltd.

Richo Company, Ltd.

Yasuo Asahina

Satoshi Mochizuki

Hideki Sugiura

Yasuaki Iwamoto

Shinya Nakayama

Tomoyuki Ichikawa

Hisashi Nakajima

Koichi Sakata

Kazuhiko Umemura

Akihiro Kotsugai

Tomomi Suzuki

Masami Tomita

Osamu Uchinokura

Hiroyuki Fushimi

Fumihiro Sasaki

Masayuki Ishii

Minoru Masuda

Hiroshi Yamada

Takahiro Honda

Mitsuo Aoki

Hitoshi Iwatsuki

Toshiki Nanya

Kohki Katoh

Kousuke Suzuki

Hiroshi Yamashita

Hiroaki Matsuda

Satoru Inoue

Tomoko Utsumi

Nobuhiro Nakayama

Satoru Miyamoto

Ryoichi Namiki

Hiroshi Yaguchi

Shunichi Chiba

Kohsuke Suzuki

Tomomi Tamura

Kayo Makita

Hiroto Higuchi

Yoshihiro Sakai

Setsuo Soga

Michihito Ohashi

Junko Tomita

Ichiro Fukushima

Shin-ichi Kuramoto

Toru Iida

Shigeru Emoto

Junichi Awamura

Shinichiro Yagi

Shinichi Kuramoto

Naohito Shimota

Takuya Saito

Sonoh Matsuoka

Toshiyuki Kikuchi

Hidefumi Gohhara

Yuichiro Higashi

Yoshihisa Okamoto

Chiharu Mochizuki

Michio Izumi

Kohichi Sakata

Masahide Yamashita

Masanori Suzuki

Yohichiroh Watanabe

Tsuneyasu Nagatomo

Keiko Shiraishi

Kazuhito Watanabe

Hachiro Tosaka

Motoi Orihara

Kazumi Ohtaki

Kiyoshi Imai

Hideo Nakamura

Nobuyuki Hasebe

Yoshihiro Nomura

Noriaki Ide

Yosihisa Okamoto

Masaru Wakisaka

Tomiaki Asami

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

Tomoko Green Grass Utsumi

Masami Pasco Grand Mansion Shinnumazu 302 Tomita

Shinya Grand River A 201 Nakayama

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

A toner includes a polyol-based resin having multiple hydroxyl groups in a molecular chain thereof in which a ratio of epoxy group to hydroxyl group is from 0.990 to 1.010. A stirring and transfer device satisfies 1000000&#x2266;&#x3b1;&#xd7;&#x3b2;&#xd7;&#x3b3;&#x2266;16000000, wherein &#x3b1; represents a number of rotation per minute, &#x3b2; (mm) represents a pitch and &#x3b3; (mm) represents a transfer path length of the stirring and transfer device. A temperature Tin (&#xb0; C.) in a development device during stirring and transfer of a two component developing agent satisfies 3020 C.&#x3c;Tin&#x3c;60&#xb0; C., and the toner satisfies Y&#x2266;&#x2212;0.5X+45, 5&#x2266;X&#x3c;40, 5&#x2266;Y&#x2266;35, wherein X (%) represents a degree of agglomeration of a mother toner particle and Y (%) represents a degree of agglomeration of the toner which has been preserved at 55&#xb0; C. for 24 hours.

Image formation method

Disclosed is a developer containing toner and carrier, the toner containing as a binder resin a polyol resin having a plurality of OH groups in a molecule chain having an EX/OH ratio between epoxy groups (EX) and OH groups (OH) of 0.990 to 1.010. The rotational speed &#x3b1;, pitch &#x3b2; and conveyance path length &#x3b3; of an stirring and conveying unit satisfies 1.0&#xd7;10&#x2266;&#x3b1;&#xd7;&#x3b2;&#xd7;&#x3b3;&#x2266;16.0&#xd7;10. Toner base particles having an electrostatic property satisfies 1.5&#x3c;[Q/M]/[Q/M]&#x3c;2.5, toner having an electrostatic property satisfies 0.7&#x3c;[Q/M]/[Q/M]&#x3c;1.3, the external additive comprises two types of fine inorganic particles having different resistance values, wherein the particle size distribution Y and added amount X of the fine inorganic particles with smaller resistance satisfy 0.1&#x2266;x&#x2266;2.0, and Y&#x2266;2.6&#xd7;10X+0.0048.

Image forming method and toner for developing latent electrostatic image

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

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 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

A toner which includes a toner material, wherein the toner satisfies the following formula:0&#xb0; C.&#x2266;&#x394;Tm&#x2266;20&#xb0; C.where &#x394;Tm represents Tma (&#xb0; C.)&#x2212;Tmb (&#xb0; C.), Tma (&#xb0; C.) is &#xbd; flown-out temperature of the toner by a capillary type flow tester, and Tmb (&#xb0; C.) is &#xbd; flown-out temperature of a melt kneaded mixture of the toner by the capillary type flow tester, and wherein Tma is from 130&#xb0; C. to 200&#xb0; C.

A toner containing toner particles having a core-shell structure containing a binder resin, a colorant and a release agent. The toner particles are prepared by dissolving or dispersing at least one of the binder resin and a precursor thereof in an organic solvent or a polymeric monomer and reacting the resultant in an aqueous medium for reaction, wherein the toner satisfies the following relationship: &#x394;Tm=Tm&#x2212;Tm&#x3e;10 &#xb0; C., wherein Tmrepresents half efflux temperature of the toner and Tmrepresents half efflux temperature of a toner which is prepared by melting and kneading the toner particles and wherein a content of the release agent existing close to the surface portion of the toner particles is from 7 to 30% by volume based on an entire portion close to the surface portion of the toner particles when the content is determined by Fourier Transform Infrared Spectroscopy Attenuated Total Reflection (FTIR-ATR) method.

Toner and fixing device and image forming device using the same

A toner for developing an electrostatic image, includes: a colorant; and a binder resin. The toner has a particle including at least one pore having a diameter of 10 nm or over, and a porosity thereof is in a range from 0.01 to 0.60.

Toner for developing electrostatic image, developer, image forming apparatus, process for forming image, process cartridge and process for measuring porosity of toner

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-that represents the sphericity of toner particles is 105 to 180, a surface factor SF-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.

Growing community of inventors

Numazu, Japan

Yasuo Asahina