Canon Kabushiki Kaisha

Hideya Arimura

Masaki Yamada

Kazuhiro Yamauchi

Satoru Nishioka

Hiroaki Komatsu

Sosuke Yamaguchi

Shohei Urushihara

Takashi Koyanagi

Masashi Uno

Fumihiko Utsuno

Masahiro Watanabe

Toru Ishii

Ryo Sugiyama

Kazuaki Nagaoka

Tomoya Uesugi

Kenta Matsunaga

Yoshinobu Ogawa

Wataru Moriai

Provided is an electrophotographic member that shows a small increase in electrical resistance value even when used under a low-temperature environment. The electrophotographic member is an electrophotographic member including an electroconductive substrate and a resin layer on the electroconductive substrate, wherein the resin layer contains an anion, inorganic particles having a hydrophobicity degree of 40% or more and 80% or less, and a resin having a specific cation structure.

Electrophotographic member, process cartridge, and electrophotographic image-forming apparatus

Provided is an electrophotographic member in which the increase in tackiness is small even in an environment of high temperature and high humidity. The electrophotographic member includes an electroconductive substrate and a surface layer, the surface layer contains resin including at least one of a urethane bond and an amide bond, the resin includes a cationic structure and an anionic structure in a molecule, and also includes a particular main-chain structure with hydrophobicity.

Electrophotographic member, process cartridge, and electrophotographic apparatus

Provided an electrophotographic member having an excellent electroconductivity and being capable of forming a high quality electrophotographic image even in long-term use. The electrophotographic member comprises an electroconductive substrate and an electroconductive layer on the substrate, the electroconductive layer containing a matrix polymer, and a specific imidazolium salt.

Electrophotographic member, process cartridge and electrophotographic image forming apparatus

There is provided a member for electrophotography, which contributes to formation of a high-quality electrophotographic image. The member for electrophotography includes an electro-conductive substrate and an electro-conductive layer as an outermost layer, wherein the electro-conductive layer contains a resin having a nitrogen-containing heterocyclic cation structure, an anion, and a specific carbon black.

Member for electrophotography, process cartridge and electrophotographic apparatus

The electrophotographic member includes: an electroconductive substrate; and a surface layer having a mono-layer structure, wherein the surface layer has a matrix containing a cross-linked urethane resin as a binder, and when an elastic modulus of the matrix in a first region in a thickness direction from an outer surface of the surface layer to a depth of 0.1 &#x3bc;m from the outer surface of the surface layer is defined as E1, and an elastic modulus of the matrix in a second region in a thickness direction from a depth of 1.0 &#x3bc;m from the outer surface of the surface layer to 1.1 &#x3bc;m from the outer surface of the surface layer is defined as E2, E1 and E2 satisfy the following Expressions (1) and (2), respectively:1&#x2265;200 MPa&#x2003;&#x2003;(1); and10 MPa&#x2264;2&#x2264;100 MPa&#x2003;&#x2003;(2).

Electrophotographic member having a surface layer with a cross-linked urethane resin-containing matrix, process cartridge, and apparatus

The electrophotographic member includes an electro-conductive substrate, a urethane resin having a structure of structural formula (1), an anion, and a resin particle, and has a protrusion derived from the resin particle on an outer surface thereof, the resin particle contains one or both of a urethane resin and a polyamide resin, the resin layer further contains carbon black, and the carbon black extracted from the resin layer has a BET specific surface area of 33 m/g or more and 133 m/g or less, and DBP absorption amount at a 70% torque value in DBP absorption measurement of 42 ml/100 g or more and 90 ml/100 g or less.

Electrophotographic member, process cartridge and electrophotographic apparatus

Provided is an electrophotographic member including an electro-conductive substrate and a surface layer on the substrate. The surface layer contains a urethane resin and a first polymer having a specific nitrogen-containing structure. The urethane resin has a structure derived from a second polymer containing a fluorine atom or a structure derived from a third polymer containing a fluorine atom and a silicon atom. The surface layer contains nitrogen atoms derived from the nitrogen-containing structure at a specific ratio in a region from the outer surface of the surface layer to a depth of 300 nm, and the atomic ratios of nitrogen atoms, fluorine atoms, and silicon atoms in a region from a depth of 100 nm from the outer surface of the surface layer to a depth of 300 nm and a region from the outer surface to a depth of 10 nm have specific relationships.

The present invention provides an electrophotographic member which has a high ability to impart charge to toners while the charge imparting ability is unlikely to be reduced even under an environment at high temperature and high humidity. The electrophotographic member comprises a substrate, an elastic layer formed on the substrate, an intermediate layer covering the surface of the elastic layer, and a surface layer covering the surface of the intermediate layer, wherein the intermediate layer contains a binder resin and a polymer having a specific structure, the surface layer contains silicon oxide, and the surface layer has a thickness of 10 nm or more and 300 nm or less.

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

A member for electrophotography has an electro-conductive base and at least one electro-conductive resin layer, in which the electro-conductive resin layer of the outermost layer contains urethane resin and the urethane resin has a structure of a silicone graft fluororesin and a structure represented by Formula (1) 

Member for electrophotography, 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.

Provided is an electrophotographic member that is excellent in charge-imparting performance for a toner, and that hardly causes tackiness on its surface even when placed under a high-temperature and high-humidity environment over a long time period. The electrophotographic member includes a substrate and a surface layer, in which the surface layer satisfies the following requirements (A) and (B): (A) the surface layer contains, in a region from its surface to a depth of up to 0.1 &#x3bc;m, a copolymer containing a constituent unit represented by the following structural formula (1), and at least one selected from the group consisting of a constituent unit represented by the following structural formula (2) and a constituent unit represented by the following structural formula (3); and (B) the concentration of a nitrogen atom derived from a nitrogen-containing aromatic heterocyclic amine structure in the copolymer is from 6.0 mass % to 30.0 mass %. 

Electrophotographic member, method of producing the same, 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 electrophotographic member includes an electroconductive substrate and an electroconductive surface layer. The surface layer contains an electroconductivity imparting agent and a polyrotaxane including a first and a second polyrotaxane molecule. The first polyrotaxane molecule includes a first cyclic molecule, and the second polyrotaxane molecule includes a second cyclic molecule. The cyclic molecules of the first and the second polyrotaxane molecules are bound in such a manner that the oxygen atom of a hydroxy group of the first cyclic molecule and the oxygen atom of a hydroxy group of the second cyclic molecule are bound with a structure represented by the following formula (1):*&#x2014;R&#x2014;Z&#x2014;R&#x2014;** In this formula, z represents a linking group, and '*' and '**' represent binding sites to be bound to either of the oxygen atoms derived from the hydroxy groups of the first and the second cyclic molecule. Rand Reach represent a specific structure.

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.

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Shizuoka, Japan

Hideya Arimura