Canon Kabushiki Kaisha

Dupont Toray Specialty Materials Kabushiki Kaisha

Sosuke Yamaguchi

Masaki Yamada

Kazuhiro Yamauchi

Satoru Nishioka

Hideya Arimura

Taichi Shintou

Shohei Urushihara

Ryo Sugiyama

Takashi Koyanagi

Minoru Nakamura

Kentarou Nakamura

Kazuaki Nagaoka

Minoru Ito

Takahiro Miyazawa

Takeshi Miyazaki

Kazutoshi Ishida

Yuji Sakurai

Yuto Miyauchi

Rieko Takabe

Takanori Kaihara

The present invention provides an electrophotographic member having excellent deformation recovery even when stored or used under a high temperature and high humidity environment, which is useful in forming a high-quality electrophotographic image; a process cartridge; and an electrophotographic apparatus. The electrophotographic member of the present invention includes a conductive mandrel and an electro-conductive layer; the electro-conductive layer including a resin synthesized from an ion conducting agent and a compound being able to react with the ion conducting agent; the ion conducting agent including a specific anion and a cation having at least three hydroxyl groups; the compound being able to react with the hydroxyl group.

Electrophotographic member, process cartridge and electrophotographic apparatus

A curable white silicone composition that is capable of forming a cured product having a high optical reflectance as well as exceptional light resistance is provided. The curable white silicone composition includes (A) an organopolysiloxane having at least 2 alkenyl groups per molecule, (B) a cerium-containing organopolysiloxane, (C) a white pigment, and (D) a curing catalyst.

Curable white silicone formulation, a reflective material for optical semiconductor module and optical semiconductor device

A white curable silicone composition provides excellent elongation characteristics while providing sufficiently great hardness, which as a result can provide a cured product having excellent toughness. The composition comprises: (A) alkenyl group-containing resinous organopolysiloxane which is represented by an average composition formula: (RSiO)(RSiO)(RSiO)(SiO)(XO), where, in the formula, Rare each independently a monovalent hydrocarbon group, while at least two Rare alkenyl groups, X is a hydrogen atom or an alkyl group, 0&#x2264;a&#x2264;0.7, 0&#x2264;b&#x2264;0.2, 0&#x2264;c&#x2264;0.3, 0&#x2264;d&#x2264;0.8, and 0&#x2264;e&#x2264;0.2, a+b+c+d=1.0, and c+d&#x3e;0 are satisfied; (B) linear alkenyl group-containing organopolysiloxane which is represented by RRSiO(RSiO)SiORR, where, in the formula, Ris an alkenyl group, Rare each independently a monovalent hydrocarbon group other than an alkenyl group, and n is an integer of 50 or greater; (C) organohydrogenpolysiloxane having at least two hydrogen atom-bonded silicon atoms in one molecule; (D) a catalyst for curing reaction; and (E) a white pigment, wherein the component (A) is included in an amount of 20 mass % or more based on the total mass of the organopolysiloxane components, and the alkenyl group content in the components (A) to (C) is 1.7 mass % or less.

Curable white silicone formulation, a reflective material for optical semiconductor module, and optical semiconductor device

Provided an electrophotographic member capable of causing less fog in an H/H environment even when used in a torque-reduced image forming apparatus. The member comprises an electro-conductive substrate, an electro-conductive layer thereon and insulating parts, the member having a surface having an electrical insulating first region and an electro-conductive second region, the first region and the second region being adjacent to each other, a total area of the second region in a square region put on an outer surface of the member is 30% to 80% of an area of the square region; two or more of the 200 straight lines drawn in the square region at an interval of 5 &#x3bc;m pass the second region at least once, and, the number of line segment LS having a length of 200 &#x3bc;m or more is 5% or less of the total number of the line segment LS.

Electrophotographic member, electrophotographic process cartridge and electrophotographic image forming apparatus

Provided is a developer carrying member that enables stable formation of images of high quality even on recording paper having a high talc content. The developer carrying member includes a conductive base member and a surface layer, wherein the surface layer includes a urethane resin, and the urethane resin has a carbonate bond and a tertiary amine structure.

Developer carrying member, process cartridge, and electrophotographic apparatus

The developer carrying member, includes: an electroconductive substrate; and a surface layer containing a resin, on the substrate, in which a thickness of the surface layer is 1.0 &#x3bc;m or more and 100.0 &#x3bc;m or less, a Martens hardness at an indentation depth of 0.1 &#x3bc;m that is measured by infiltrating a Vickers indenter in a thickness direction of the surface layer from an outer surface of the surface layer is 50.0 N/mmor more and 100.0 N/mmor less, an Asker C hardness that is measured from the outer surface of the surface layer is 75&#xb0; or more and 90&#xb0; or less, and a value of a work function of the outer surface of the surface layer is 5.6 eV or more and 6.0 eV or less.

The electrophotographic member comprises: an electroconductive substrate; and an electroconductive layer on or above the substrate, an outer surface of the electrophotographic member having electrically insulating first regions and an electroconductive second region, each of the first regions being adjacent to the second region, wherein assuming that a square region having a side length of 300 &#x3bc;m is put on an outer surface of the electrophotographic member, in the square regions, the first regions are included, and assuming that Voronoi tessellation is conducted with respect to the first regions in the square region to create Voronoi polygons, a coefficient of variation of S/SV is from 0.10 to 1.00, where SV denotes a plane area of each of the Voronoi polygons, and Sdenotes a plane area of one of the first regions included in each of the Voronoi polygons.

Provided is an electrophotographic member which hardly undergoes deformation even when subjected to a load over a long period of time under a high-temperature and high-humidity environment and thus can stably form a high-quality electrophotographic image. The electrophotographic member includes: an electroconductive substrate; and an electroconductive resin layer on the substrate, in which the resin layer contains a cation having a specific structure and a specific anion.

Electrophotographic member, process cartridge, and electrophotographic apparatus

Provided is a member for electrophotography that is not reduced in charge-providing performance even by its long-term storage and use under a high-temperature and high-humidity environment, and is hence conducive to the formation of a high-quality electrophotographic image. The member for electrophotography includes: an electroconductive substrate; and an electroconductive layer, in which: the electroconductive layer contains a resin having a cationic organic group in a molecule thereof and an anion; a total sum of contents of an alkali metal and an alkali earth metal in the electroconductive layer is 500 ppm or less; and the anion includes at least one selected from the group consisting of a fluorosulfonate anion, a fluorocarboxylate anion, a fluorosulfonylimide anion, a fluorosulfonylmethide anion, a fluoroalkylfluoroborate anion, a fluorophosphate anion, a fluoroantimonate anion, and a fluoroarsenate anion.

Member for electrophotography and method of producing the member, process cartridge, and electrophotographic apparatus

Provided is an electrophotographic member capable of forming a high-quality electrophotographic image. The electrophotographic member includes an electroconductive substrate and an electroconductive resin layer on the electroconductive substrate, in which the electroconductive resin layer contains a resin having, in the molecule, a specific cation structure, and a specific anion.

The present invention provides an electrophotographic electro-conductive member containing an ion-exchange group structure in an electro-conductive layer, whereby the bleeding of an ionic conductive agent to the surface of the electro-conductive layer is suppressed and reduction in electro-conductivity caused by electrification is low. For this purpose, the electrophotographic member of the present invention is an electrophotographic member having an electro-conductive mandrel and an electro-conductive layer, wherein the electro-conductive layer contains a resin having any one or more of partial structures represented by the specific formulas (1) to (7) in the molecule, and an anion.

Electrophotographic member, process cartridge and electrophotographic image forming apparatus

A developing member includes a conductive substrate, a conductive elastic layer on the conductive substrate, and a plurality of insulating domains on the conductive elastic layer, wherein the surface of the developing member includes the surfaces of the insulating domains and an exposed portion of the conductive elastic layer not covered with the insulating domains. The conductive elastic layer contains a resin and an anion, wherein the resin has a specific cationic structure synthesized from an ion conductive agent composed of a cation including at least one reactive functional group and an anion and a compound that can react to the ion conductive agent.

Developing member, method of producing developing member, process cartridge, and electrophotographic apparatus

Provided is an electrophotographic member that has a high excessive charging-suppressing effect under a low-temperature and low-humidity environment, and has high charge-providing performance under a high-temperature and high-humidity environment, and a process cartridge and an electrophotographic apparatus each including the electrophotographic member. The electrophotographic member is an electrophotographic member including an electro-conductive substrate and an electro-conductive resin layer, the electro-conductive resin layer contains a cation and at least one anion selected from the group consisting of anions represented by the following formulae (1) to (5): where X represents an arbitrary halogen atom, n in the structural formula (4) represents an integer of from 2 to 6, and n in the structural formula (5) represents an integer of 2 or 3.

The present invention provides an electrophotographic member in which an increase in resistance is small even in use at low temperature and which contributes to the formation of a high quality electrophotographic image, and a process cartridge and an electrophotographic apparatus using this electrophotographic member as a charging member or a developer carrying member. Therefore, the electrophotographic member of the present invention is an electrophotographic member including an electro-conductive mandrel and an electro-conductive layer, wherein the electro-conductive layer includes a urethane resin and an ion-conductive agent, the urethane resin has, between two adjacent urethane bonds, a structure represented by formula (1) and at least one structure selected from the group consisting of a structure represented by formula (2) and a structure represented by formula (3), and the ion-conductive agent contains a particular anion.

Growing community of inventors

Susono, Japan

Sosuke Yamaguchi