Charge Transport Layer Containing Alkenylarylamine Patents (Class 430/58.85)
  • Patent number: 10761441
    Abstract: A method for producing an electrophotographic photosensitive member includes an electrically conductive substrate and a photosensitive layer. The method includes applying an application liquid for photosensitive layer formation containing a solvent, a binder resin, and a hole transport material directly or indirectly onto the electrically conductive substrate, and removing a portion of the solvent, to form the photosensitive layer. The solvent contains a first solvent that is an alcohol having a carbon number of at least 1 and no greater than 3, and a second solvent other than the first solvent.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: September 1, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Tomofumi Shimizu, Kenji Kitaguchi, Kiichiro Oji
  • Patent number: 10761440
    Abstract: A photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer is a single-layer photosensitive layer (3c). The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The hole transport material includes a triphenylamine derivative represented by general formula (HT). The electron transport material includes a compound represented by general formula (ET1), (ET2), (ET3), (ET4), or (ET5).
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: September 1, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hiroki Tsurumi, Eiichi Miyamoto, Jun Azuma
  • Patent number: 10191397
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin. The polyarylate resin is represented by general formula (1). The hole transport material contains a compound represented by general formula (HTM1), (HTM2), (HTM3), (HTM4), (HTM5), (HTM6), or (HTM7). The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m. The photosensitive layer has a Vickers hardness of at least 17.0 HV.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: January 29, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Keiji Maruo, Tomofumi Shimizu, Jun Azuma
  • Patent number: 10078276
    Abstract: A positively chargeable single-layer electrophotographic photosensitive member is used as an image bearing member in an image forming apparatus including a charging section configured to be in contact with the image bearing member to apply a voltage thereto. The positively chargeable single-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer contains at least a charge generating material, a hole transport material, an electron transport material, and a binder resin. The hole transport material contains a triarylamine derivative represented by the following general formula (I). In general formula (I), R1, R2, m and n have the same meaning as R1, R2, m, and n defined in the description.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: September 18, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hiroki Tsurumi, Eiichi Miyamoto
  • Patent number: 10012916
    Abstract: Provided is a photoreceptor for electrophotography, having high sensitivity and high-speed response performance, and which prevents accumulation of residual potential even when used repeatedly. Also, provided are a photoreceptor cartridge and an image forming apparatus, each employing the photoreceptor.
    Type: Grant
    Filed: May 17, 2017
    Date of Patent: July 3, 2018
    Assignee: S-PRINTING SOLUTION CO., LTD.
    Inventor: Hiroaki Takamura
  • Patent number: 9581921
    Abstract: An electrophotographic photosensitive member includes a photosensitive layer containing a charge generating material, a charge transport material, and a binder resin. The photosensitive layer is a multi-layer type photosensitive layer or a single-layer type photosensitive layer. The multi-layer type photosensitive layer includes a charge generating layer that contains the charge generating material and a charge transport layer that contains the charge transport material and the binder resin, and in which the charge transport layer is located on the charge generating layer. The single-layer type photosensitive layer contains the charge generating material, the charge transport material, and the binder resin. The charge transport material is an enamine derivative represented by general formula (1). In general formula (1), R1, R2, l, m, and n are each as defined in the specification.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: February 28, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hideki Okada, Fumio Sugai, Kensuke Kojima
  • Patent number: 9436105
    Abstract: A triarylamine derivative is represented by general formula (I). In general formula (I), R1 and R2 each represent, independently of one another, a chemical group selected from the group consisting of a halogen atom, an optionally substituted alkyl group having a carbon number of at least 1 and no greater than 6, an optionally substituted alkoxy group having a carbon number of at least 1 and no greater than 6, and an optionally substituted aryl group having a carbon number of at least 6 and no greater than 12. In general formula (I), m and n each represent an integer of at least 0 and no greater than 4. When m and n represent integers greater than 1, chemical groups R1 bonded to the same aromatic ring and chemical groups R2 bonded to the same aromatic ring may be the same or different to one another.
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: September 6, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hideki Okada, Kensuke Kojima, Fumio Sugai
  • Patent number: 9023562
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; and a photosensitive layer provided on the conductive substrate that includes an organic photoconductive material and charge transport materials including a styryl compound represented by structural formula (I) below and a triphenylamine compound represented by structural formula (II) below: wherein the charge transport materials have a mixing ratio of from 8.33 to 16.67 mass % of the styryl compound to from 91.67 to 83.33 mass % of the triphenylamine compound.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: May 5, 2015
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Takashi Ueno, Yuji Ogawa, Keiichi Kurokawa
  • Publication number: 20150118608
    Abstract: A multi-layer electrophotographic photosensitive member contains a charge generating material including oxo-titanium phthalocyanine that among diffraction peaks for Bragg angles 2?±0.2° with respect to characteristic X-rays of CuK? having a wavelength of 1.542 ?, at least exhibits a highest diffraction peak at 27.2°. The multi-layer electrophotographic photosensitive member also contains a hole transport material including a triarylamine derivative shown in Generic Formula (1). A ratio of the hole transport material relative to a binder resin in a charge transport layer is no greater than 0.55. In Generic Formula (1), Ar1 represents an aryl group substituted with at least one substituent selected from the group consisting of an alkoxy group having two to four carbon atoms and an optionally substituted phenoxy group, and Ar2 represents an aryl group optionally substituted with an alkyl group having one to four carbon atoms.
    Type: Application
    Filed: October 23, 2014
    Publication date: April 30, 2015
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun AZUMA, Hideki OKADA
  • Publication number: 20150079511
    Abstract: A photoconductor that includes, for example, a supporting substrate, an optional ground plane layer, an optional hole blocking layer, an optional adhesive layer, an optional anticurl layer, a photogenerating layer, and a charge transport layer comprised of a first charge transport compound, a second dissimilar charge transport compound, a fluoropolymer and a polyarylatecarbonate.
    Type: Application
    Filed: September 14, 2013
    Publication date: March 19, 2015
    Applicant: Xerox Corporation
    Inventors: Jin Wu, Kenny-Tuan T. Dinh, Lanhui Zhang, Lin Ma, Nancy L. Belknap, Helen R. Cherniack
  • Patent number: 8956793
    Abstract: An electrophotographic photoreceptor includes a conductive support, an undercoat layer that is provided on the conductive support and that has a thickness of from 15 ?m to 40 ?m and has light transmittance of 20% or less with respect to light having a wavelength of 450 nm when the thickness is at least 15 ?m, a charge generation layer that is provided on the undercoat layer, and a charge transport layer that is provided on the charge generation layer and that has a thickness of from 15 ?m to 40 ?m and has light transmittance of 30% or less with respect to light having a wavelength of 450 nm when the thickness is at least 15 ?m.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: February 17, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kenta Ide, Kosuke Narita, Akihiro Kawasaki, Satoya Sugiura, Akihiro Nonaka, Hirofumi Nakamura, Kazuhiro Koseki, Shigeto Hashiba
  • Patent number: 8956792
    Abstract: Provided is an electrophotographic photosensitive member which is excellent in terms of both continuous reduction of contact stress with contact members and the like and potential stability during repeated use. A charge transport layer which serves as a surface layer of an electrophotographic photosensitive member has a matrix-domain structure including a matrix containing a component [?] (polycarbonate resin D having a specific repeating structural unit) and a charge-transporting substance and domains containing a component [?] (polycarbonate resin A having a repeating structural unit including a specific siloxane moiety).
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: February 17, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Atsushi Okuda, Harunobu Ogaki, Kazunori Noguchi, Takashi Anezaki, Kazuhisa Shida, Shio Murai
  • Patent number: 8951702
    Abstract: A charge transport material having reduced photodeterioration is disclosed to be an ethylene compound having an ethylene double bond site, having a structure in which four different substituents are substituted at the ethylene double bond site, and having general formula (I) below where R1, R2 and R3 are each independently a hydrogen atom, a halogen atom, an alkyl group of 1 to 6 carbons or an alkoxyl group of 1 to 6 carbons; R4 is phenyl or tolyl; and Ar is one group selected from the group consisting of naphthyl, biphenyl, anthryl, xylyl, and phenanthryl. An electrophotographic photoreceptor and process for producing the electrophotographic photoreceptor also are disclosed. The electrophotographic photoreceptor includes a conductive substrate; and a photosensitive layer provided on the conductive substrate that includes the charge transport material.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: February 10, 2015
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Fengqiang Zhu, Yoichi Nakamura, Ikuo Takaki, Seizo Kitagawa, Shinjirou Suzuki
  • Patent number: 8889324
    Abstract: An image bearing member including an electroconductive substrate, and a photosensitive layer provided overlying the electroconductive substrate, the photosensitive layer containing at least one charge transport materials selected from the group consisting of a naphthalene tetracarboxylic acid diimide-isoindol derivative represented by the following chemical structure 1, a naphthalimide-isoindol derivative represented by the following chemical structure 2, and a triphenyl amine-isoindol derivative represented by the following chemical structure 3, where R1 and R2 independently represent a hydrogen atom, a substituted or non-substituted alkyl group, an alkoxy group, a substituted or non-substituted aromatic hydrocarbon group, a halogen atom, and a nitro group, k represents an integer of 1 to 4, and l represents an integer of from 1 to 5 and R3 represents a substituted or non-substituted alkyl group, a substituted or non-substituted cycloalkyl group, and a substituted or non-substituted aromatic hydrocarbo
    Type: Grant
    Filed: February 8, 2011
    Date of Patent: November 18, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryota Arai, Tomoyuki Shimada
  • Patent number: 8815479
    Abstract: An electrophotographic photosensitive member comprises a charge-transporting layer which is a surface layer of the electrophotographic photosensitive member; wherein the charge-transporting layer has a matrix-domain structure having: a matrix comprising a component [?] and a component [?] (charge-transporting substances having specific structures), and a domain comprising a component [?](resin [?1], or resin [?1] and resin [?2]).
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: August 26, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhisa Shida, Atsushi Okuda, Kazunori Noguchi, Takashi Anezaki, Harunobu Ogaki, Shio Murai
  • Patent number: 8808953
    Abstract: An electrophotographic photoreceptor includes a conductive support, and an undercoat layer, a charge generation layer, and a charge transport layer that are provided in this order on the conductive support, wherein the undercoat layer includes at least metallic oxide particles, a reactive acceptor substance including an anthraquinone structure expressed by the following Formula 1, and a binder resin, the charge generation layer includes hydroxygallium phthalocyanine as a charge generation material, and a reflectance of incident light having a wavelength of 780 nm on a surface of the charge generation layer when the charge transport layer is removed is 17% or greater: wherein the anthraquinone structure expressed by Formula 1 is bonded to another structure at a position of *, and thus forms the reactive acceptor substance, and in Formula 1, n1 represents an integer of 1 to 7.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: August 19, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Satoya Sugiura, Shigeto Hashiba, Kazuhiro Koseki, Hirofumi Nakamura, Kenta Ide, Akihiro Nonaka, Kosuke Narita, Akihiro Kawasaki
  • Patent number: 8785090
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; and a single-layer photosensitive layer that is provided on the conductive substrate and includes a binder resin, at least one kind of charge generation material selected from hydroxygallium phthalocyanine pigments and chlorogallium phthalocyanine pigments, a hole transport material represented by Formula (1), and an electron transport material represented by Formula (2):
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: July 22, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yuko Yamano, Shinya Yamamoto, Masahiro Iwasaki, Takayuki Yamashita, Yohei Saito, Jiro Korenaga
  • Patent number: 8786181
    Abstract: The present invention relates to a blend comprising; a) at least one polymer or copolymer or a mixture of a plurality of polymers and/or copolymers which contain a main chain and a side chain, where at least one side chain contains a structural unit of the following formula (I), the symbols and indices used here are as defined below; b) at least one host molecule which has electron- or hole-transporting functionality, and c) at least one emitter molecule.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: July 22, 2014
    Assignees: Merck Patent GmbH, Fraunhofer-Gesellschaft Forschung E.V.
    Inventors: Thomas Eberle, Rémi Manouk Anémian, Manuel Thesen, Hartmut Krueger, Armin Wedel, Beatrice Salert, Stefanie Kreissl
  • Patent number: 8765335
    Abstract: The electrophotographic photosensitive member includes a surface layer containing (?), (?) and (?).
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: July 1, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daisuke Tanaka, Kazumichi Sugiyama, Tsutomu Nishida
  • Patent number: 8765337
    Abstract: The present invention is to provide a multilayer type electrophotographic photoconductor capable of stably obtaining a high image quality image over a long term by restraining the exposure memory and the photo memory, and an image forming apparatus comprising such a multilayer type electrophotographic photoconductor. A multilayer type electrophotographic photoconductor comprising a charge generating layer containing at least a charge generating agent on a base member directly or via an intermediate layer, and a charge transporting layer containing at least a charge transporting agent and a binder resin formed successively, wherein the light absorption degree at a 680 nm wavelength light beam in the photoconductive layer of the multilayer type electrophotographic photoconductor is of a value of 0.8 or less, and the light absorption degree at a 450 nm wavelength light beam is of a value of 1.
    Type: Grant
    Filed: May 24, 2007
    Date of Patent: July 1, 2014
    Assignee: Kyocera Mita Corporation
    Inventors: Keiji Maruo, Junichiro Otsubo, Jun Azuma
  • Patent number: 8753789
    Abstract: An electrophotographic photosensitive member comprises a charge-transporting layer which is a surface layer of the electrophotographic photosensitive member; wherein the charge-transporting layer has a matrix-domain structure having: a matrix comprising: at least one resin selected from the group consisting of a polycarbonate resin C and a polyester resin D; and at least one charge-transporting substance selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (1?), and a domain comprising a polycarbonate resin A.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: June 17, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Harunobu Ogaki, Kazunori Noguchi, Atsushi Okuda, Shio Murai, Kazuhisa Shida, Takashi Anezaki
  • Patent number: 8722288
    Abstract: [Problems] To provide a novel compound which has a high carrier mobility and is useful as a charge-transporting agent that is not only capable of stably forming a photosensitive layer without precipitating crystals or forming pinholes at the time of forming the photosensitive layer but is also capable of forming an organic photosensitive material for electrophotography that has a high sensitivity and a low residual potential. [Means for Solution] A diphenylnaphthylamine derivative represented by the following general formula (1), wherein R1 to R3 are alkyl groups, k is an integer of 0 to 3, j is an integer of 0 to 4, l is an integer of 0 to 6, and X1 and X2 are hydrocarbon groups having at least one ethylenically unsaturated bond.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: May 13, 2014
    Assignee: Hodogaya Chemical Co., Ltd.
    Inventors: Shigetaka Numazawa, Katsumi Abe, Makoto Koike, Kiyotaka Ihara
  • Publication number: 20140127618
    Abstract: An electrophotographic photoreceptor includes: a conductive substrate; and a photosensitive layer provided on the conductive substrate and containing an organic photoconductive material and charge transport materials including a styryl compound represented by structural formula (I) below and a triphenylamine compound represented by structural formula (II) below This photoreceptor resolves the problem of light induced fatigue that occurs when using a triphenylamine compound as a charge transport material to thereby provide a good electrophotographic photoreceptor with little light-induced fatigue while controlling costs.
    Type: Application
    Filed: October 10, 2013
    Publication date: May 8, 2014
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Takashi Ueno, Yuji Ogawa, Keiichi Kurokawa
  • Publication number: 20140127617
    Abstract: An organic photoconductor includes a conductive substrate; a charge generation layer over the conductive substrate; a charge transport layer over the charge generation layer; and an overcoat layer over the charge transport layer. The overcoat layer comprises a cross-linked polyacrylate that includes a charge transport material dispersed therein and a polyhedral oligomeric silsesquioxane.
    Type: Application
    Filed: November 8, 2012
    Publication date: May 8, 2014
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: Zhang-Lin Zhou, Krzysztof Nauka, Lihua Zhao, Anthony William McLennan
  • Patent number: 8697321
    Abstract: When an abutting pressure of the cleaning blade on a photoreceptor is increased, a chattering occurs due to the so-called a stick-slip phenomenon that the blade repeatedly undergoes sticking to the outermost surface of the photoreceptor and slipping thereon. As a result, a possibility of noise generation becomes higher and there is a possibility that toner particles might pass through during slipping to cause a cleaning failure, resulting in a streaky image defect. There is also a higher possibility that the so-called a filming phenomenon might occur, in which a component of the toner sticks to the photoreceptor surface by the action of the blade pressure and becomes difficult to remove, so as to lead to persistent image defects. Furthermore, since the photoreceptor is rotated with toners in the state of being strongly pressed thereagainst, the image defects are apt to be caused due to peripheral-direction scratches.
    Type: Grant
    Filed: May 10, 2011
    Date of Patent: April 15, 2014
    Assignee: Mitsubishi Chemical Corporation
    Inventor: Akiteru Fujii
  • Patent number: 8679710
    Abstract: The present invention provides an electrophotographic photoreceptor comprising a photosensitive layer that contains at least a charge generating agent, a hole transport agent and a prede mulas (A) and (B). The electrophotographic photoreceptor prevents image defect termined additive. The hole transport agent satisfies the following for from occurring and can meet the demand for higher speed image forming apparatuses, by reducing the adhesion of paper dust and preventing the occurrence of cracks. ? ? M < 1.2 × 10 - 8 ( A ) ? ? > 5.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: March 25, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventors: Daisuke Kuboshima, Eiichi Miyamoto, Kazunari Hamasaki, Norio Nakai, Yoshio Inagaki, Hideki Okada, Tetsuya Ichiguchi, Keiji Maruo
  • Patent number: 8663883
    Abstract: A charge-transporting film includes a polymer of a compound represented by Formula (I): (Ra)n-Fa-Xa-Fa?-(Ra?)n???(I) wherein Fa and Fa? independently represent a charge-transporting sub-unit including an aromatic ring, Ra and Ra? independently represent a —CH?CH2 directly bonded to the aromatic ring of the charge-transporting sub-unit or a group represented by Formula (a), Xa represents an alkylene group or a bivalent group in which an alkylene group and a group selected from —O—, —S—, and ester are combined, n and n? independently represent an integer of 0 or more (wherein n and n? are not simultaneously 0), and L represents a linking group which is represented by *—(CH2)n?—O—CH2— and which is bonded to the aromatic ring of the charge-transporting sub-unit, wherein n? is 1 or 2 and the linking group is bonded to the aromatic, ring of the charge-transporting sub-unit with *.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: March 4, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Wataru Yamada, Katsumi Nukada, Takatsugu Doi, Yuko Iwadate, Tomoya Sasaki
  • Patent number: 8663882
    Abstract: To provide an electrophotographic photoreceptor excellent in electric characteristics and various characteristics, capable of forming a uniform photosensitive layer and excellent in repetitive characteristics, an image forming apparatus using it and an electrophotgraphic cartridge. A lamination type electrophotographic photoreceptor comprising an electroconductive substrate and a photosensitive layer formed thereon, characterized in that the photosensitive layer contains a compound represented by the following formula (1), the ratio of the weight of the compound represented by the formula (1) to the weight content of all binder resins contained in the photosensitive layer is from 0.15 to 0.
    Type: Grant
    Filed: September 28, 2006
    Date of Patent: March 4, 2014
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Teruyuki Mitsumori, Masayuki Hiroi, Hiroaki Takamura
  • Publication number: 20130288169
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; and a single-layer photosensitive layer that is provided on the conductive substrate and includes a binder resin, at least one kind of charge generation material selected from hydroxygallium phthalocyanine pigments and chlorogallium phthalocyanine pigments, a hole transport material represented by Formula (1), and an electron transport material represented by Formula (2):
    Type: Application
    Filed: November 14, 2012
    Publication date: October 31, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yuko YAMANO, Shinya YAMAMOTO, Masahiro IWASAKI, Takayuki YAMASHITA, Yohei SAITO, Jiro KORENAGA
  • Patent number: 8546049
    Abstract: An electrophotographic photoconductor comprising a charge generation layer containing a charge generation material and a charge transfer layer containing a charge transfer material laminating in this order on a conductive support with an undercoat layer interposed between the charge generation layer and the conductive support, or comprising a monolayer type photosensitive layer containing a charge generation material and a charge transport material being formed on a conductive support with an undercoat layer interposed between the monolayer type photosensitive layer and the conductive support, wherein the charge transport layer or the monolayer type photosensitive layer contains, as a charge transfer material, a bisamine compound represented by the following general formula (I):
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: October 1, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akiko Kihara, Akihiro Kondoh, Takatsugu Obata
  • Publication number: 20130236821
    Abstract: An electrophotographic photoreceptor includes a conductive support, an undercoat layer that is provided on the conductive support and that has a thickness of from 15 ?m to 40 ?m and has light transmittance of 20% or less with respect to light having a wavelength of 450 nm when the thickness is at least 15 ?m, a charge generation layer that is provided on the undercoat layer, and a charge transport layer that is provided on the charge generation layer and that has a thickness of from 15 ?m to 40 ?m and has light transmittance of 30% or less with respect to light having a wavelength of 450 nm when the thickness is at least 15 ?m.
    Type: Application
    Filed: August 13, 2012
    Publication date: September 12, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Kenta IDE, Kosuke NARITA, Akihiro KAWASAKI, Satoya SUGIURA, Akihiro NONAKA, Hirofumi NAKAMURA, Kazuhiro KOSEKI, Shigeto HASHIBA
  • Patent number: 8524428
    Abstract: An electrophotographic photoreceptor includes: a conductive substrate; a photosensitive layer including a charge-generating layer containing a charge-generating material and a charge-transporting layer containing a charge-transporting material, the charge-transporting layer having a hole mobility of about 5.0×10?6 (cm2/V·sec) or less at an electric field of 2 V/cm; and an overcoat layer that is provided on the photosensitive layer and contains a cured material of a charge-transporting material, wherein relational expression (1) Ip(OCL)>Ip(CTL)>Ip(CGL) is satisfied wherein Ip(CGL) represents an ionization potential (eV) of the charge-generating material contained in the charge-generating layer; Ip(CTL) represents an ionization potential (eV) of the charge-transporting material contained in the charge-transporting layer; and Ip(OCL) represents an ionization potential (eV) of the charge-transporting material contained in the overcoat layer.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: September 3, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Hirofumi Nakamura
  • Publication number: 20130183613
    Abstract: There is provided a photoconductive member comprising a conductive support and disposed thereon a charge generating layer. The charge generating layer comprises a first polymer binder and a flaventhrone component having blue wavelength photosensitivity of the following formula: wherein each of R1, R2, R3, R4, R5 and R6, are the same or different and are independently selected from the group comprising a hydrogen, alkyl, aryl and halogen. A charge transport layer is disposed on the conductive support and comprises tri-p-toylamine and 1,-1-bis(N,N-ditoyl-4-aminophenyl)cyclohexane in a second polymer binder.
    Type: Application
    Filed: January 16, 2012
    Publication date: July 18, 2013
    Applicant: XEROX CORPORATION
    Inventors: Cuong Vong, Jennifer A. Coggan, Gregory M. McGuire
  • Patent number: 8481238
    Abstract: An electrophotographic photoreceptor is provided which comprises a conductive substrate and a photosensitive layer formed thereover, wherein the photosensitive layer contains at least a polyarylate resin having a repeating structure represented by the following formula [1] and a compound represented by the following formula [6]. This photoreceptor has excellent abrasion resistance under practical load, has high mechanical strength, and further has highly excellent electrical properties.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: July 9, 2013
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Rui Zhao, Yuka Nagao, Teruyuki Mitsumori, Tadashi Mizushima, Shunichiro Kurihara, Takayuki Shoda
  • Publication number: 20130157181
    Abstract: An electrophotographic photoconductor including: an electroconductive substrate; an intermediate layer; and a photoconductive layer, the intermediate layer and the photoconductive layer being on the electroconductive substrate, wherein the intermediate layer includes an inorganic pigment and a binder resin, wherein a volume ratio of the inorganic pigment in the intermediate layer is 30% by volume to 50% by volume, wherein the inorganic pigment comprises titanium oxide and a content of the titanium oxide in the inorganic pigment is 70% by mass to 90% by mass, wherein the inorganic pigment has a specific surface area of 70 m2/g to 140 m2/g, and wherein the intermediate layer has a volume resistivity at an electrical field intensity of 2.5×105 V/cm of 5×1011 ?·cm to 1×1013 ?·cm.
    Type: Application
    Filed: December 14, 2012
    Publication date: June 20, 2013
    Inventors: Eiji Kurimoto, Tadayoshi Uchida, Hideki Nakamura
  • Publication number: 20130137027
    Abstract: An organic photoconductor includes an inner charge generation layer for generating charges and an outer charge transport layer for facilitating charge transport. The charge transport layer comprises a semi-interpenetrating hole-transport polymer or oligomer network in which the polymer or oligomer is cross-linked. A process for forming a charge transport layer in an organic photoconductor is also provided.
    Type: Application
    Filed: November 30, 2011
    Publication date: May 30, 2013
    Inventors: Zhang-Lin Zhou, Krzysztof Nauka, Hou T. Ng
  • Publication number: 20130101929
    Abstract: Provided is an electrophotographic photoreceptor including a conductive substrate and a photosensitive layer provided on the conductive substrate, wherein an uppermost surface layer thereof is constituted with a cured film of a composition that contains at least two kinds of reactive charge transporting materials selected from a first reactive charge transporting material having an —OH group as a reactive functional group and a second reactive charge transporting material having an —OCH3 group as a reactive functional group, fluororesin particles, and an alkyl fluoride group-containing copolymer having repeating units represented by the following Structural Formulae A and B, and a relative dielectric constant ?r of the uppermost surface layer satisfies the following Formula (1):
    Type: Application
    Filed: April 20, 2012
    Publication date: April 25, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Jiro KORENAGA, Keiko MATSUKI, Masahiro IWASAKI, Mitsuhide NAKAMURA
  • Patent number: 8380109
    Abstract: An image forming apparatus including at least an image bearing member having a substrate having a photosensitive layer thereon, the image bearing member to bear a latent electrostatic image on a surface thereof, a charging device to the surface of the image bearing member, an irradiation device to irradiate the surface of the image bearing member with light to form a latent electrostatic image thereon, a development device to develop the latent electrostatic with toner to obtain a developed image, a transfer device to transfer the developed image to a recording medium, and a cleaning device to clean the surface of the image bearing member, wherein the photosensitive layer includes naphthalene tetracarbonic acid diimide derivative as a charge transport material represented by the following Chemical Structure (1): In the Chemical Structure (1), Z represents a group represented by the following Chemical Formula (1): or the following Chemical Formula (2): —R9??Chemical Formula (2).
    Type: Grant
    Filed: January 9, 2009
    Date of Patent: February 19, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Eiji Kurimoto, Keisuke Shimoyama, Tomoyuki Shimada, Masafumi Ohta, Yuuji Tanaka
  • Patent number: 8349529
    Abstract: An electrophotographic photoconductor including a conductive substrate and a photoconductive layer thereover, wherein the photoconductive layer contains a charge generation agent and a charge transport agent represented by General Formula (A-I), (B-I) or (C-I), and an amine compound represented by General Formula (II): where R1-3 each represent hydrogen, halogen or (un)substituted C1-6 alkyl, and n is 1 or 2, where R1-2 each represent C1-6 alkyl and R3-6 each represent hydrogen, halogen or (un)substituted C1-6 alkyl, where R8-33 each represent hydrogen, C1-4 alkyl, C1-4 alkoxy, or (un)substituted phenyl, and may be identical or different, where A and B each represent a group represented by formula (i) or (ii), and may be identical or different: —CH2X??formula (i) —CH2CH2Y??formula (ii) where X and Y each represent an (un)substituted aromatic group.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: January 8, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Keisuke Shimoyama, Takaaki Ikegami, Eiji Kurimoto, Kohsuke Yamamoto, Tetsuya Sakuma, Toshihiko Koizumi, Hajime Suzuki, Hideki Nakamura
  • Patent number: 8304153
    Abstract: An electrophotographic photoreceptor including a conductive substrate and a photosensitive layer overlying the conductive substrate. The photosensitive layer comprises a phthalimide isoindole derivative having a specific chemical formula.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: November 6, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyuki Shimada, Ryota Arai
  • Patent number: 8268521
    Abstract: According to an aspect of the invention, an electrophotographic photoreceptor including a conductive substrate and a photosensitive layer provided on a surface of the conductive substrate is provided. In the electrophotographic photoreceptor, an outermost layer of the photosensitive layer containing a crosslinked product formed from at least one charge transporting material having at least one substituent selected from the group consisting of —OH, —OCH3, —NH2, —SH, and —COOH, an acidic substance, and at least one compound selected from the group consisting of compounds represented by the following formula (A) and compounds represented by the following formula (B).
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: September 18, 2012
    Assignees: Fuji Xerox Co., Ltd., Xerox Corporation
    Inventors: Katsumi Nukada, Hirofumi Nakamura, Mitsuhide Nakamura, Koji Bando, Kenny-tuan T Dinh, Giuseppa Baranyi, Nan-Xing Hu, Michael Zak
  • Patent number: 8263297
    Abstract: An electrophotographic photoconductor including a conductive support and a photosensitive layer, wherein the photosensitive layer contains a charge generation agent, a charge transport agent and a binder resin, and wherein the charge generation agent contains an asymmetric disazo pigment represented by General Formula (I), the charge transport agent contains a triphenylamine compound represented General Formula (IX), and the mass ratio of the charge transport agent to the binder resin is 0.3 to 2.0, where R1 and R2 each represent a substituted or unsubstituted alkyl group, alkoxy group, aryl group or heterocyclic group, provided that R1 and R2 are different, where R3 to R5 each represent hydrogen, a halogen atom, an alkyl group having 1 to 6 carbon atoms, which may have a substituent, an alkoxy group having 1 to 6 carbon atoms, which may have a substituent, or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: September 11, 2012
    Assignees: Ricoh Company, Ltd., Yamanashi Electronics Co., Ltd.
    Inventors: Takaaki Ikegami, Takeshi Takada, Toshihiko Koizumi, Hideki Nakamura, Hajime Suzuki, Keisuke Shimoyama, Kohsuke Yamamoto, Eiji Kurimoto
  • Patent number: 8257891
    Abstract: To provide an electrophotographic photoconductor including: a substrate; a charge generating layer; and a charge transporting layer, the charge generating layer and the charge transporting layer being disposed over the substrate, wherein the charge transporting layer contains a charge transporting material represented by General Formula (I) below and an additive represented by General Formula (II) below: where R1, R2 and R3 each independently denote any one of a hydrogen atom, a halogen atom, an alkyl group which may contain a substituent, and an alkoxy group which may contain a substituent, where R4 and R5 each denote a tertiary butyl group, and R6 and R7 each independently denote one of an alkyl group which may contain a substituent, and an aryl group which may contain a substituent.
    Type: Grant
    Filed: January 8, 2010
    Date of Patent: September 4, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Naoki Nakatake, Atsushi Takehara, Toshihiko Koizumi, Tsuyoshi Ueda, Tadayoshi Uchida, Hajime Suzuki
  • Publication number: 20120208116
    Abstract: A photoconductor containing an optional supporting substrate layer, a photogenerating layer, a bis(enylaryl)arylamine containing charge transport layer, and a top overcoat layer, which includes charge transport compounds and melamine resins.
    Type: Application
    Filed: February 14, 2011
    Publication date: August 16, 2012
    Applicant: XEROX CORPORATION
    Inventor: Jin WU
  • Publication number: 20120208117
    Abstract: [Problems] To provide a novel compound which has a high carrier mobility and is useful as a charge-transporting agent that is not only capable of stably forming a photosensitive layer without precipitating crystals or forming pinholes at the time of forming the photosensitive layer but is also capable of forming an organic photosensitive material for electrophotography that has a high sensitivity and a low residual potential. [Means for Solution] A diphenylnaphthylamine derivative represented by the following general formula (1), wherein R1 to R3 are alkyl groups, k is an integer of 0 to 3, j is an integer of 0 to 4, l is an integer of 0 to 6, and X1 and X2 are hydrocarbon groups having at least one ethylenically unsaturated bond.
    Type: Application
    Filed: November 4, 2010
    Publication date: August 16, 2012
    Applicant: HODOGAYA CHEMICAL CO., LTD.
    Inventors: Shigetaka Numazawa, Katsumi Abe, Makoto Koike, Kiyotaka Ihara
  • Patent number: 8232031
    Abstract: The present invention provides a naphthalenetetracarboxylic acid diimide derivative represented by the following general formula (1): wherein R1 and R2, which are identical or different, each represent a substituted or non-substituted alkyl group or a substituted or non-substituted aromatic hydrocarbon group; R3 represents an alkyl group having 1 to 8 carbon atoms or an aromatic hydrocarbon group; R4, R5, R6 and R7, which are identical or different, each represent a hydrogen atom, a substituted or non-substituted alkyl group, or a substituted or non-substituted aromatic hydrocarbon group; and R1 and R2 may be linked to form a substituted or non-substituted heterocyclic group including a nitrogen atom; with compounds where all of R1, R2 and R3 are a methyl group, and compounds where both of R1 and R2 are a methyl group and R3 is a 1-octyl group being excluded.
    Type: Grant
    Filed: September 5, 2008
    Date of Patent: July 31, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Masafumi Ohta, Tomoyuki Shimada, Yuuji Tanaka, Eiji Kurimoto, Keisuke Shimoyama
  • Patent number: 8227157
    Abstract: The present invention provides a single-layer electrophotographic photoreceptor provided with a single-layer photosensitive layer that adapts to an exposing source emitting a laser beam with wavelengths of from 400 nm to 450 nm inclusive and is laminated on a conductive substrate, the single-layer photosensitive layer comprising: an enamine-type compound that functions as both a charge generation material and a charge transport material and is represented by the following general formula (1); and a perylene-type compound that functions as both an electron-transport material and a sensitizer and is represented by the following general formula (2):
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: July 24, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Toriyama, Mami Adachi
  • Publication number: 20120156599
    Abstract: An electrophotographic photoconductor, comprising: a conductive support; and a photosensitive layer provided on the conductive support and containing a charge generation material and a charge transport material, the photosensitive layer containing, as the charge transport material, a compound represented by the following general formula (I): wherein Ar1 represents an optionally substituted arylene or bivalent heterocyclic group; Ar2s, which may be the same or different, each represent a hydrogen atom or an optionally substituted alkyl, aralkyl, aryl or monovalent heterocyclic group; R1 represents an optionally substituted alkyl group; R2s each represent a hydrogen atom or an optionally substituted alkyl group; R3 and R4s, which may be the same or different, each represent a hydrogen atom or an optionally substituted alkyl or alkoxy group; and n is 0 or 1.
    Type: Application
    Filed: December 5, 2011
    Publication date: June 21, 2012
    Inventors: Takatsugu Obata, Akihiro Kondoh
  • Patent number: 8178266
    Abstract: An electrophotographic photoreceptor is provided that contains a conductive substrate, an undercoat layer, a charge generation layer, and a charge transport layer, wherein the under coat layer contains a binder resin and multiple inorganic pigments each having different average primary particle diameters in a total amount of from 75 to 86% by weight, the charge generation layer contains a binder resin and a titanyl phthalocyanine pigment having a specific X-ray diffraction spectrum in an amount of from 70 to 85% by weight, the charge transport layer comprises a specific distyryl compound, and the following formulae (2-1) to (2-3) are satisfied: 0.2?(D(F2)/D(G))?0.5??(2-1) 0.2?D(F1)??(2-2) D(F2)?D(F1)??(2-3) wherein D(F1) (?m) and D(F2) (?m) represent average primary particle diameters of the largest and smallest inorganic pigments, respectively, and D(G) (?m) represents an average primary particle diameter of the titanyl phthalocyanine pigment.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: May 15, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiromi Tada, Nozomu Tamoto, Tomoyuki Shimada, Takafumi Iwamoto
  • Publication number: 20120064443
    Abstract: An N-phenyl-diphenylisoindole derivative having the following formula (I): wherein each of R1 and R2 represents a hydrogen atom, a substituted or an unsubstituted alkyl group, a substituted or an unsubstituted alkoxy group, a substituted or an unsubstituted phenyl group, or a substituted or an unsubstituted phenoxy group; R3 represents a hydrogen atom, a substituted or an unsubstituted alkyl group, a substituted or an unsubstituted alkoxy group, a substituted or an unsubstituted phenyl group, a substituted or an unsubstituted phenoxy group, or has the following formula (2): wherein each of R4 and R5 represents a substituted or an unsubstituted alkyl group, or a substituted or an unsubstituted phenyl group; 1 represents an integer of from 1 to 4; and each of m and n represents an integer of from 1 to 5.
    Type: Application
    Filed: September 13, 2011
    Publication date: March 15, 2012
    Inventors: Ryota ARAI, Tomoyuki Shimada