Canon Kabushiki Kaisha

Harunobu Ogaki

Kazunori Noguchi

Atsushi Okuda

Hiroki Uematsu

Atsushi Ochi

Takashi Anezaki

Shio Murai

Daisuke Miura

Akihiro Maruyama

Kazuhisa Shida

Yuki Yamamoto

Takakazu Tanaka

Takeshi Murakami

Masataka Kawahara

Akira Shimada

Akio Maruyama

Toshihiro Kikuchi

Kimihiro Yoshimura

Takayuki Sumida

Yohei Miyauchi

Akio Koganei

Kyoichi Teramoto

Koji Takahashi

Akira Yoshida

Yuka Ishiduka

Kenichi Kaku

Itaru Takaya

Keiko Yamagishi

Hirotoshi Uesugi

Nobumichi Miki

Takashi Kenmoku

Kenta Kamikura

Kazumichi Sugiyama

Hiroyuki Tomono

Wataru Kitamura

Yota Ito

Yuzo Seino

Tatsuya Yamaai

Shuhei Iwasaki

Akira Sakakibara

Yasuhiro Kawai

Kunihiko Sekido

Takumi Furukawa

Yuya Tomomizu

Hidetoshi Hirano

Yukihiro Abe

Masahiro Watanabe

Yuji Kawaguchi

Tsutomu Nishida

Nobuhiro Nakamura

Taichi Sato

Kazunari Hagiwara

Nobuo Kosaka

Tomohito Taniguchi

Mai Murakami

Takehiko Aoyama

Atsushi Uematsu

Noboru Miyagawa

Hirofumi Kumoi

Provided is a process cartridge detachably attachable to a main body of an electrophotographic apparatus, the process cartridge including: a developing unit including a toner; and an electrophotographic photosensitive member, wherein the toner includes a toner particle, the toner particle has a surface containing a polyvalent acid metal salt particle, and a surface layer of the electrophotographic photosensitive member contains at least one metal oxide particle among an aluminum oxide particle, a silicon dioxide particle, and a tin oxide particle.

Process cartridge and electrophotographic apparatus

The present disclosure provides a process cartridge and an electrophotographic apparatus in which fogging is reduced so as to reduce an amount of toner consumed. A process cartridge configured to be detachably attachable to a main body of an electrophotographic apparatus includes a developing unit containing a toner, and an electrophotographic photosensitive member, wherein the toner is a toner that has a toner particle, and has a metal salt of a polyvalent acid at least on a part of a surface of the toner particle; wherein the metal salt of the polyvalent acid includes at least one kind of metal element selected from metal elements belonging to from Group 3 to Group 13, and a surface layer of the electrophotographic photosensitive member contains an acrylic resin or a methacrylic resin.

Provided are a process cartridge and an electrophotographic apparatus each of which is reduced in fogging for reducing a toner consumption. Specifically, provided is a process cartridge, which is removably mounted onto a main body of an electrophotographic apparatus, the process cartridge including: a developing unit containing a toner; and an electrophotographic photosensitive member, wherein the toner is a toner including a toner particle, and has a polyvalent acid metal salt on at least part of a surface of the toner particle, wherein the polyvalent acid metal salt includes at least one kind of metal element selected from metal elements belonging to from Group 3 to Group 13, and wherein a surface layer of the electrophotographic photosensitive member contains a resin including a siloxane segment.

Provided is a process cartridge having a charging member and an electrophotographic photosensitive member to be charged by being in contact with the charging member, wherein the electrophotographic photosensitive member has a support and a photosensitive layer in this order, and a surface layer of the electrophotographic photosensitive member has a Martens hardness of 230 N/mmor less.

Provided are a process cartridge and an electrophotographic apparatus each suppressed in fluctuation in charging potential at the time of its long-term use. The process cartridge includes: an electrophotographic photosensitive member having a surface layer containing a resin and a charge-transporting substance; and a charging member configured to charge the electrophotographic photosensitive member, wherein an average of Martens hardnesses of the surface layer of the electrophotographic photosensitive member measured at a pushing force of 7 mN is 245 N/mmor more, and wherein in a core defined by three-dimensional surface texture standards (ISO 25178-2:2012) of the surface of the charging member, an average of Martens hardnesses measured at a pushing force of 0.04 mN is 2 N/mmor more and 20 N/mmor less, and an average of adhesivenesses measured with a scanning probe microscope in a field of view of 2-micrometer square is 70 mV or less.

A process cartridge configured to be detachably attachable to a main body of an electrophotographic image forming apparatus, in which an occurrence of an image failure is suppressed, wherein the process cartridge includes an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and the cleaning member is formed of a urethane foam, wherein a density of the urethane foam is 200 to 500 kg/cm, and a 25% compressive load of the urethane foam is 0.3 MPa or smaller.

Process cartridge and electrophotographic image forming apparatus

An electrophotographic photosensitive member includes a surface layer containing a charge transporting material and a polyester resin having a specific structure.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

An electrophotographic photosensitive member includes a surface layer containing a charge transporting material and a specific polyester resin having a structure including a specific branched chain.

An electrophotographic photosensitive member including a surface layer containing a specific polyester resin is provided. The polyester resin contains specific structures.

An electrophotographic photosensitive member including a surface layer containing a charge generating material and a polyester resin is provided. The polyester resin contains a structure having a 12- or higher-membered cycloalkylene group.

A process cartridge includes an electrophotographic photosensitive member and a gap retaining member, where the electrophotographic photosensitive member includes a first region having an undercoat layer, a charge generating layer, and a charge transporting layer on a support in this order and a second region having an undercoat layer and a charge transporting layer on a support in this order, the undercoat layer contains a metal oxide particle and any one of an urethane resin, an amino resin, and a polyamide resin as a binder resin, and the charge transporting layer contains a charge transporting substance and at least one selected from the group consisting of a polycarbonate resin and a polyester resin, and where the gap retaining member comes into contact with a surface of the second region of the electrophotographic photosensitive member.

Provided is an electrophotographic apparatus, including an electrophotographic photosensitive member, a charging unit arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, a cleaning unit or a developing unit arranged in abutment against the electrophotographic photosensitive member, and a transferring unit.

Electrophotographic apparatus and process cartridge

An electrophotographic photosensitive member includes a surface layer with a hexagonal boron nitride dispersed therein. The hexagonal boron nitride has a graphitization index (GI) of at least 3.0 and less than 15.0.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

A charge-transporting layer as the surface layer of an electrophotographic photosensitive member contains a charge-transporting substance, and contains, as resins, a resin A having specific structural units and a polycarbonate resin D having specific structural units. The charge-transporting layer has, in a matrix containing the charge-transporting substance and the polycarbonate resin D, domains each containing the resin A.

Electrophotographic photosensitive member, method of producing the electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

Provided are a method of producing an electrophotographic photosensitive member, particularly, a method of producing an electrophotographic photosensitive member and an organic device by which, in a method of forming a charge transporting layer, the stability of an application liquid for the layer after long-term storage is improved while the usage of an organic solvent in the application liquid is curtailed, and the layer having high uniformity is formed. The method is a method of producing an electrophotographic photosensitive member which includes a support and a charge transporting layer formed thereon, the method including: preparing a solution including: a first liquid whose solubility in water under 25&#xb0; C. and 1 atmosphere is 1.0 mass % or less; a second liquid whose solubility in water under 25&#xb0; C. and 1 atmosphere is 5.0 mass % or more; a charge transporting substance; and a binder resin; preparing an emulsion by dispersing the solution in water; forming a coat for the layer on the support by using the emulsion; and forming the layer by heating of the coat.

Method of producing electrophotographic photosensitive member, method of producing organic device, and emulsion for charge transporting layer

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Suntou-gun, Japan

Harunobu Ogaki