Canon Kabushiki Kaisha

Canon Kasei Kabushiki Kaisha

Hisao Kato

Hiroshi Inoue

Jun Murata

Noriaki Kuroda

Toshiro Suzuki

Yoko Kuruma

Takumi Furukawa

Arihiro Yamamoto

Toshinari Miura

Yukinori Nagata

Masaki Ozawa

Michitaka Kitahara

Kazuyuki Shishitsuka

Masanori Yokoyama

Atsushi Ikeda

Masahiro Watanabe

Masahiro Watabe

Tomohito Taniguchi

Kenya Terada

Yoshiaki Nishimura

Takehiko Aoyama

Shinji Doi

Seiji Tsuru

Syoji Inoue

Shota Segawa

Tomoya Kawakami

Mitsuhiro Kunieda

Hiroyuki Osada

Toshihiro Otaka

Youhei Ikeda

Toshirou Uchida

Masaaki Kimura

Saki Sudo

Atsushi c/o Canon Kasei Kabushiki Kaisha Ikeda

Toshihiro c/o Canon Kasei Kabushiki Kaisha Otaka

Provided is a cleaning member, comprising an elastic member that includes polyurethane, wherein: when tan δ of a test piece sampled from the elastic member is measured in the temperature range of −20° C. to +60° C., the peak temperature of a peak indicating the maximum value of tan δ is at 15.0° C. or below; the maximum value of tan δ is 0.20 to 0.55; tan δ at a temperature of 55° C. is 0.13 or larger; and where the detected quantity of all ions obtained when the test piece is heated at a rate of temperature increase of 10° C./second to 1000° C. using a direct-sampling mass spectrometer is Mand the integrated intensity of a peak in a derived ion thermogram that corresponds to a range of m/z values originating in multifunctional isocyanate with at least three isocyanate groups is M, M/Mis at least 0.001.

Cleaning member and elastic member

The present invention is aimed at providing an electrophotographic cleaning blade that has excellent chipping resistance and can exhibit excellent cleaning performance. This cleaning blade is provided with an elastic member that includes a polyurethane and a support member that supports the elastic member, and cleans the surface of a member to be cleaned that is moving, by bringing a part of the elastic member into contact with the surface of the member to be cleaned. The average value of the elastic modulus of the elastic member obtained when measured using SPM is at least 15 MPa and not more than 470 MPa, and the coefficient of variation thereof is not more than 6.0%.

Electrophotographic cleaning blade, process cartridge, and electrophotographic image forming apparatus

A charging member having a support, a conductive elastic layer formed on the support and a surface layer formed on the conductive elastic layer, wherein the surface layer contains a polysiloxane having an acrylic group and an oxyalkylene group. This provides a charging member to the surface of which toners and external additives used in the toners can not easily cling even because of repeated use over a long period of time and which therefore enables charging and image reproduction which are stable over a long period of time, even when used in the DC contact charging method; and further provides a process cartridge and an electrophotographic apparatus which have such a charging member.

Charging member, process cartridge, and electrophotographic apparatus

An object of the present invention is to provide a charging member in which a toner, an additive for use in the toner, or the like is hard to adhere to the surface even under repeated use for a long time, and hence the charging and image output are made stable for a long time even if the charging member is used in the DC contact charging method, and a process cartridge and an electrophotographic apparatus having the charging member. The present invention provides a charging member comprising a support, a conductive elastic layer formed on the support, and a surface layer formed on the conductive elastic layer, characterized in that the surface layer contains a polysiloxane having a fluoroalkyl group and an oxyalkylene group, and a process cartridge and an electrophotographic apparatus having the charging member.

Charging member, process cartridge and electrophotographic apparatus

A charging member has a surface layer. The surface layer contains a polysiloxane having a first unit, a second unit and a third unit each of which is represented by a specific formula. The ratio of the sum of the mole numbers of the first and second units to the sum of the mole numbers of the first to third units is in a specific range.

A charging member is provided in which a toner, an additive for use in the toner, or the like is hard to adhere to the surface even under repeated use for a long time, and hence the charging and image output are made stable for a long time even if the charging member is used in the DC contact charging method. Also provided are a process cartridge and an electrophotographic apparatus having the charging member. The charging member includes a support, a conductive elastic layer formed on the support, and a surface layer formed on the conductive elastic layer, characterized in that the surface layer contains a polysiloxane having a fluoroalkyl group and an oxyalkylene group, and a process cartridge and an electrophotographic apparatus having the charging member.

In a conductive member having a support and provided thereon at least one cover layer, the cover layer has a surface layer, and the surface layer contains fine particles. In the surface layer, fine particles present at the surface-layer lower part corresponding to a range within 30% of the total layer thickness from the lowermost plane have an average particle diameter which is larger than the average particle diameter of fine particles present at the surface-layer upper part corresponding to a range within 30% of the total layer thickness from the uppermost plane. A process cartridge and an electrophotographic apparatus have such a conductive member.

Conductive member, and process cartridge and electrophotographic apparatus which make use of the same

The present invention relates to a charging member for charging a surface of a member to be charged in an image forming apparatus, and one aspect of the present invention provides a charging member having an outermost surface layer containing a conductive elastic material. The conductive elastic material comprises a polymer including a polar polymer, primarily including (i) acrylonitrile butadiene rubber, (ii) an ethylene oxide-propylene oxide-allyl glycidyl ether terpolymer, and (iii) a homopolymer of epichlorohydrin. The weights x, y and z of the components (i), (ii) and (iii), respectively, have a relationship of 0.2&#x3c;y/(x+y+z)&#x2266;0.5 and 4&#x3c;y/z&#x2266;20. This charging member can realize uniform charging and is small in resistance variation, even when used for a long time.

Charging member, and image-forming apparatus and process cartridge which make use of the same

A developer amount restricting member for restricting the amount of developer on a developer bearing member has: (a) an elastic member urged toward the developer bearing member; and (b) a supporting member supporting the elastic member, wherein, when the transverse end portion of the supporting member is supported, the longitudinal end portions of the elastic member warp toward the supporting member.

Developer amount restricting member and developing device

Growing community of inventors

Ashigarakami-gun, Japan

Hisao Kato