Canon Kabushiki Kaisha

Kentaro Yamawaki

Tsuneyoshi Tominaga

Masatake Tanaka

Sara Yoshida

Masamichi Sato

Shohei Kototani

Tomonori Matsunaga

Hidekazu Fumita

Tsutomu Shimano

Akane Masumoto

Shiro Kuroki

Toshihiko Katakura

Kunihiko Nakamura

Kenta Kamikura

Yusuke Kosaki

Shinsuke Mochizuki

Takanori Watanabe

Shinsuke Kobayashi

Kazuhiro Funatani

Kenichi Iida

Ai Suzuki

Satoshi Otsuji

Minoru Nakamura

Hiroyuki Watanabe

Taiji Katsura

Kensuke Umeda

Yoshihiro Mitsui

Kosuke Ikada

Shinichi Hagiwara

Takeshi Tsujino

Junya Asaoka

Atsushi Okuda

Tsutomu Nishida

Yuka Ishiduka

Nobuhiro Nakamura

Yuhei Terui

Toru Ishii

Daisuke Miura

Shinichi Agata

Ryo Sugiyama

Shohei Tsuda

Arihiro Yamamoto

Koji Abe

Noriyoshi Umeda

Kazuaki Nagaoka

Hideharu Shimozawa

Go Shindo

Toshiya Kaino

Yasukazu Ikami

Takuya Oka

Hisashi Yamauchi

Keitaro Nakata

Tomoya Uesugi

Syoji Inoue

Nobuhisa Abe

Motoya Fukushima

Akio Nishi

Akinobu Saito

Takayoshi Ootsuka

Itaru Kondo

A mechanism that enables developer replenishment by a simpler structure and a mechanism that enables more user-friendly developer replenishment are provided. An attachment port to which a developer supply bottle containing a developer stored therein is detachably attachable is disposed in an interior of an image forming apparatus. The developer supply bottle can be attached when the cover is in an open state. According to this image forming apparatus, when the developer supply bottle is attached to the attachment port, the developer inside the developer supply bottle moves into a developer housing chamber by its own weight.

Image forming apparatus with simplified developer replenishment structure and that is user-friendly

A toner including: a toner particle containing a binder resin and a colorant; and a fine particle on a surface of the toner particle, wherein the fine particle is a solid and substantially hemispherical shape, and has a substantially flat surface and a curved surface, and wherein a number-average value of a longest diameter 'w' of the substantially flat surface is 10 to 400 nm. An external additive for a toner that is a solid and substantially hemispherical shape, and has a substantially flat surface and a curved surface, wherein a number-average value of a longest diameter “w” of the substantially flat surface is 10 to 400 nm. A fine particle that is a solid and substantially hemispherical shape, and has a substantially flat surface and a curved surface, wherein a number-average value of a longest diameter “w” of the substantially flat surface is 10 to 400 nm.

Toner, external additive for toner, and fine particle

A hot-melt adhesive comprising a thermoplastic resin and a first crystalline material, wherein when in differential scanning calorimetric measurement of the hot-melt adhesive, Tc (° C.) is a peak temperature of the highest peak of exothermic peaks observed in a temperature reduction process at 10° C./min following heating to 150° C. and Tm (° C.) is a peak temperature of the highest peak of endothermic peaks observed in a temperature increasing process at 10° C./min following the temperature reduction process, Tm−Tc is 20.0 to 70.0° C., and a tetrahydrofuran-soluble matter of the hot-melt adhesive has a weight-average molecular weight Mw, as measured by gel permeation chromatography, of 100,000 to 400,000.

Hot-melt adhesive and method for producing bonded article

The present invention provides a toner that can maintain excellent transferability even when a transfer bias is low. The toner includes a toner particle that includes a toner base particle and a plurality of convex portions X existing on a surface of the toner base particle, wherein the convex portion X contains an organic silicon polymer; when a cross-section of the toner is observed with a scanning transmission electron microscope (STEM), and the convex portions X comprise a plurality of convex portions Y each having a convex height H of 40 nm or higher, a number ratio P (H/w) of the a number of the convex portions Yin which a ratio (H/w) of the convex height H to the convex width w is 0.33 or larger and 0.80 or smaller is 70% by number or more with respect to a total number of the convex portions Y.

Toner

Image forming apparatus

A toner comprising a toner particle and an external additive, wherein the external additive comprises a composite particle comprising an organosilicon polymer fine particle covering a surface of an alumina particle, a coverage ratio of the surface of the alumina particle with the organosilicon polymer fine particle is 1 to 50 area %, and given A (nm) as a number-average particle diameter of primary particles of the organosilicon polymer fine particle and B (nm) as a number-average particle diameter of primary particles of the alumina particle, following formulae (I) and (II) are satisfied:&#x2264;90&#x2003;&#x2003;(I)100&#x2264;&#x2264;1000&#x2003;&#x2003;(II).

Provided is a developing device including: a toner; and a developer carrying member. The developer carrying member includes an electroconductive substrate and a surface layer on the substrate, the surface layer being a single layer and including a matrix containing a crosslinked urethane resin as a binder, wherein E1 &#x2265;200 MPa and 10 MPa&#x2264;E2 &#x2264;100 MPa, where E1 is an elastic modulus of the matrix in a first region from an outer surface of the surface layer to a depth of 0.1 and E2 is an elastic modulus of the matrix in a second region from a depth of 1.0 to 1.1 &#x3bc;m from the outer surface. The toner includes a toner particle containing a binder resin and a colorant and having a Martens hardness of 85 to 1,100 MPa when measured under a condition of a maximum load of 2.0&#xd7;10N.

Developing apparatus, electrophotography process cartridge, and electrophotographic image forming apparatus

The electrophotographic apparatus and process cartridge comprising an electrophotographic photosensitive member, a cleaning blade, and developing unit containing a toner, wherein the cleaning blade comprising a support member and an elastic member whose portion is abutting a surface of the electrophotographic photosensitive member; the elastic member has an elastic modulus of 15 to 470 MPa with coefficient of variation for the elastic modulus being not more than 7.0%, and the absolute value of a difference between Martens hardness values is not more than 0.30 N/mmas measured under prescribed conditions; the toner contains a toner particle and an external additive whose a number-average primary particle diameter is from 5 to 25 nm, when X1 is a coverage ratio of the toner particle by the external additive and X2 is a theoretical coverage ratio, X1 is 50 to 85 area %, and X1/X2&#x2265;&#x2212;0.0042&#xd7;X1+0.60 is satisfied.

Electrophotographic apparatus and process cartridge

A toner including a toner particle containing a binder resin, and an external additive, wherein the external additive contains an organosilicon polymer fine particle, the organosilicon polymer has a structure represented by at least one selected from the group consisting of RSiOand RSiO(wherein Rand Rrepresent organic groups), and in the number particle size distribution of the toner as measured within a particle size range of from 2 to 60 &#x3bc;m, the number-average particle diameter T-Dat which the accumulation from the smallest diameter is 50% is from 6 to 12 &#x3bc;m, the number ratio of toner 4 &#x3bc;m or less in size is from 2% to 5% of the total toner, and the number ratio of toner 3 &#x3bc;m or less in size as a percentage of the total toner 4 &#x3bc;m or less in size is from 25% to 50%.

A charging memberthat charges an image bearing memberhas an electrically conductive support and an elastic layer in contact with the image bearing member. The elastic layer includes a semi-conductive rubber composition having a matrix-domain structure including a matrix and domains having electric conductivity. The matrix has a higher volume resistivity than the domain. The developer includes a toner having toner particles. The toner particles each have a surface layer including an organosilicon polymer. The organosilicon polymer has a structure represented by R&#x2014;SiO(R is a hydrocarbon group having at least 1 and not more than 6 carbon atoms). The adhesion ratio of the organosilicon polymer on the surface of the toner particle is 90% or more.

Process cartridge and image forming apparatus

Provided is a toner including a toner particle and an external additive, wherein the external additive includes a composite particle including a hydrotalcite particle covered on the surface with an organosilicon polymer fine particle, a coverage ratio of the hydrotalcite particle surface by the organosilicon polymer fine particle is from 1% to 50%, and given A (nm) as the number-average particle diameter of the primary particles of the organosilicon polymer fine particle and B (nm) as the number-average particle diameter of the primary particles of the hydrotalcite particle, the toner satisfies the following formula (I) and formula (II):&#x2003;&#x2003;(I)20&#x2264;&#x2264;350&#x2003;&#x2003;(II).

A toner including a toner particle containing a binder resin and an external additive, wherein the external additive contains composite particles of an organosilicon polymer fine particle and a fatty acid metal salt.

Toner and toner manufacturing method

Provided is a toner including a toner particle containing a binder resin, and an external additive, wherein the external additive contains an external additive A and an external additive B, the external additive A is an organosilicon polymer fine particle, the number-average particle diameter of primary particles of the organosilicon polymer fine particle is from 30 to 300 nm, the external additive B is a silica fine particle, the number-average particle diameter of primary particles of the silica fine particle is from 100 to 300 nm, the fixing rate of the external additive A to the toner particle according to a water washing method is less than 30%, and the fixing rate of the external additive B to the toner particle according to the washing method is at least 30%.

A toner containing: a toner particle that contains a binder resin and an external additive, wherein the external additive contains an organosilicon polymer fine particle, the binder resin contains an amorphous resin and a crystalline polyester resin, a content of the crystalline polyester resin in the binder resin is from 5 to 30 mass %, and the crystalline polyester resin contains from 5 to 25 mass % of a component having a molecular weight of not more than 2,500.

Growing community of inventors

Mishima, Japan

Kentaro Yamawaki