Radiation-sensitive Composition Or Product Patents (Class 430/56)
  • Patent number: 10802411
    Abstract: An electrophotographic photosensitive member includes a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. An optical response time is 0.05 milliseconds or longer and 0.85 milliseconds or shorter. The optical response time is a time from irradiation of a surface of the photosensitive layer charged to +800 V with pulse light having a wavelength of 780 nm to decay of a surface potential of the photosensitive layer from +800 V to +400 V. The pulse light has an intensity that allows the surface potential of the photosensitive layer to decay to +200 V from +800 V after 400 milliseconds elapse from the irradiation of the surface of the photosensitive layer charged to +800 V with the pulse light. The photosensitive layer has a Martens hardness at 50° C. of at least 160 N/mm2.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: October 13, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Yuko Iwashita, Kazunari Hamasaki, Kazutaka Sugimoto
  • Patent number: 10795273
    Abstract: A bis-butadiene derivative is represented by general formula (1) shown below. In general formula (1), Ra, Rb, and Rc each represent, independently of one another, an alkyl group having a carbon number of at least 1 and no greater than 8 or an alkoxy group having a carbon number of at least 1 and no greater than 8. l and m each represent, independently of one another, an integer of at least 0 and no greater than 5. n represents an integer of at least 0 and no greater than 4. Chemical groups Ra may be the same as or different from each other. Chemical groups Rb may be the same as or different from each other. Chemical groups Rc may be the same as or different from each other.
    Type: Grant
    Filed: June 17, 2019
    Date of Patent: October 6, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Kensuke Kojima
  • Patent number: 10761442
    Abstract: Provided are an electrophotographic photosensitive member including a support and a photosensitive layer above the support, in which a surface layer of the electrophotographic photosensitive member includes a polymerization product of a composition containing a specific hole transporting compound, and an electrophotographic apparatus and a process cartridge including the electrophotographic photosensitive member. Also provided is a method of producing the electrophotographic photosensitive member, including (i) forming a coating film of a coating solution for a surface layer which is a composition containing a specific hole transporting compound, and (ii) forming the surface layer of the electrophotographic photosensitive member by a polymerization reaction of the composition containing the specific hole transporting compound.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: September 1, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koichi Nakata, Haruki Mori, Shubun Kujirai, Shinji Takagi, Isao Kawata, Yuto Ito, Ryuji Higashi
  • Patent number: 10658587
    Abstract: Subject matter herein disclosed relates to a method for the manufacture of a CEM switching device providing that the CEM layer comprises a doped metal compound substantially free from metal wherein ions of the same metal element are present in different oxidation states. The method may provide a CEM layer which is born on and capable of switching with operating voltages below 2.0V.
    Type: Grant
    Filed: October 24, 2018
    Date of Patent: May 19, 2020
    Assignee: Arm Limited
    Inventors: Kimberly Gay Reid, Lucian Shifren, Carlos Alberto Paz de Araujo, Jolanta Bozena Celinska
  • Patent number: 10649354
    Abstract: The present disclosure relates to an electrophotographic photoreceptor which can suppress occurrence of abnormalities such as peeling or falling off of a film from a substrate end portion in a film formation step of a surface layer and maintain and reproduce a stable printing quality even in a use stage after productization, and an image forming apparatus including the same. An electrophotographic photoreceptor includes a cylindrical substrate including a chamfered face located between an substrate outer circumferential surface and a substrate end face, and a surface layer located on the outer circumferential surface. The substrate outer circumferential surface includes a first uneven portion. The chamfered face includes a second uneven portion and a third uneven portion located on a surface of the second uneven portion. A surface roughness Sa of the second uneven portion is larger than a surface roughness Sa of the third uneven portion.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: May 12, 2020
    Assignee: KYOCERA CORPORATION
    Inventor: Tomomi Fukaya
  • Patent number: 10642175
    Abstract: The present invention provides an electrophotographic photosensitive member which has a substrate, a photoconductive layer and a surface layer formed from hydrogenated amorphous silicon carbide in this order. The average value of the carbon content (C/(C+Si)) of the surface layer formed from the hydrogenated amorphous silicon carbide is set at 0.90 or more and less than 1.00, and the average value of the hydrogen content (H/(H+C+Si)) is set at 0.40 or less; and when the average value of the ratios of the sum of a Si—O bond and an O—Si—O bond in the outermost surface region that constitutes a range within a depth of 5 nm or less from the outermost surface of the surface layer is represented by a, and an average value of the silicon content (Si/(C+Si)) is represented by b, 0.015?a*b?0.090 holds.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: May 5, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Jun Ohira, Hironori Owaki, Yukihiro Abe, Yasuo Kojima, Kazunari Ooyama, Takanori Ueno
  • Patent number: 10597413
    Abstract: Certain phosphonate compounds useful as photoinitiators are provided herein.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: March 24, 2020
    Assignees: HENKEL AG & CO. KGAA, HENKEL IP & HOLDING GMBH
    Inventors: Wenjuan Tan, Zhixiang Lu, Hao Wu, Yong Zhang, Zheng Lu, Xuelong Hou
  • Patent number: 10558133
    Abstract: An electrophotographic photosensitive member suppressing potential variation due to repeated use is provided. The electrophotographic photosensitive member is an electrophotographic photosensitive member including a support, a photosensitive layer and a protective layer in this order, wherein the protective layer contains: a resin including a structure represented by a general formula (1) and a structure represented by a general formula (2); and a compound represented by a general formula (3), the molar ratio of the proportion of the structure represented by the general formula (2) to the proportion of the structure represented by the general formula (1) in the resin is 0.0002 to 0.1000 in a molar ratio, and the molar ratio of the content of the compound represented by the general formula (3) to the content of the structure represented by the general formula (1) in the resin in the protective layer is 0.0002 to 0.1000 in a molar ratio.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: February 11, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Nobuhiro Nakamura, Tsutomu Nishida, Atsushi Okuda, Yuka Ishiduka, Hiroyuki Watanabe, Hideharu Shimozawa, Kenichi Kaku, Koichi Nakata, Haruki Mori
  • Patent number: 10558132
    Abstract: An electrophotographic photosensitive member includes a support and a surface layer, in which the surface layer contains a copolymer of a composition which contains at least a compound represented by the following general formula (1) and a compound represented by the following general formula (2), a content of the compound represented by the general formula (1) in the composition is 25 mass % or more and 70 mass % or less with respect to a total content of the compound represented by the general formula (1) and the compound represented by the general formula (2), and the total content of the compound represented by the general formula (1) and the compound represented by the general formula (2) is 55 mass % or more with respect to a total mass of the composition.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: February 11, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuka Ishiduka, Tsutomu Nishida, Atsushi Okuda, Hiroyuki Watanabe, Hideharu Shimozawa, Nobuhiro Nakamura, Kenichi Kaku, Daisuke Miura, Koichi Nakata, Masaki Nonaka, Koji Takahashi, Haruki Mori
  • Patent number: 10551754
    Abstract: A method of producing an electrophotographic photoreceptor composed of a photosensitive layer provided on a conductive substrate, includes, in the formation of an outermost layer, controlling slope k of a straight line obtained by plotting the average film density of outermost layer and boiling point of solvent used for the formation of the outermost layer along the ordinate and the abscissa, respectively, to be 1.50E-4 (g/cm3·° C.) or greater, and adjusting the difference in film density of the outermost layer between the surface side and the side close to the conductive substrate to be 0.030 g/cm3 or less. The electrophotographic photoreceptor has reduced image defects even after long-term use and has excellent wear performance.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: February 4, 2020
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Shinjiro Suzuki, Tomoki Hasegawa, Hirotaka Kobayashi
  • Patent number: 10539891
    Abstract: There is provided an electrophotographic member which suppresses scraping and contamination of a surface even in the durable use of multiple sheet printing under a high temperature environment. The electrophotographic member has an electroconductive substrate and a single elastic layer as a surface layer, the surface layer includes a binder resin and carbon black dispersed in the binder resin, the carbon black has a volatile content of 0.4% or more, the binder resin includes a crosslinked urethane resin and a crosslinked acrylic resin, and the surface layer has a first area in which the crosslinked urethane resin and the crosslinked acrylic resin form an interpenetrating polymer network structure, the first area being from an outer surface of the surface layer to a depth of 0.1 ?m in the surface layer.
    Type: Grant
    Filed: June 7, 2019
    Date of Patent: January 21, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Toru Ishii, Kazutoshi Ishida, Wataru Moriai
  • Patent number: 10539889
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. An optical response time is at least 0.05 milliseconds and no greater than 0.85 milliseconds. The binder resin includes a polycarbonate resin including a repeating unit represented by general formula (1) shown below and a repeating unit represented by general formula (2) shown below.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: January 21, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Yuko Iwashita, Kazunari Hamasaki, Kazutaka Sugimoto
  • Patent number: 10539892
    Abstract: Provided is an electrophotographic photosensitive member that is reduced in exposure memory and is excellent in electrical characteristics and durability. The electrophotographic photosensitive member includes in this order: a support; a photosensitive layer; and a protective layer, wherein the protective layer contains a resin having a structure represented by the following general formula (1) and a structure represented by the following general formula (2).
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: January 21, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tsutomu Nishida, Yuka Ishiduka, Kenichi Kaku, Nobuhiro Nakamura, Hiroyuki Watanabe, Hideharu Shimozawa, Atsushi Okuda
  • Patent number: 10488770
    Abstract: There is provided an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus in which residual potential is suppressed and a ghost image is prevented from being generated in a low-humidity environment in an undercoat layer of the electrophotographic photosensitive member. An electrophotographic photosensitive member including: an undercoat layer containing a strontium titanate particle having a maximum peak at a position of 2?=32.20±0.20 (? represents a Bragg angle) in a CuK? characteristic X-ray diffraction pattern and a half-value width of the maximum peak of 0.10 deg or more and 0.50 deg or less, and a titanium oxide particle; and a photosensitive layer containing a polyvinyl butyral resin, and a process cartridge and an electrophotographic apparatus each provided with the electrophotographic photosensitive member.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: November 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ikuyo Kuroiwa, Wataru Kitamura, Kumiko Takizawa, Tsuyoshi Shimada, Eileen Takeuchi
  • Patent number: 10488771
    Abstract: A surface layer of an electrophotographic photosensitive member contains a cured product of a composition containing a hole transport compound having an acryloyloxy group or a methacryloyloxy group, and a compound having a specific structure.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: November 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Haruki Mori, Masaki Nonaka, Koichi Nakata, Shinji Takagi
  • Patent number: 10466642
    Abstract: The present invention relates to a solid lubricant to be coated on an image bearing member included in an electrophotographic image forming apparatus. The solid lubricant contains a resin particle and metal soap. The resin particle includes a particle body containing an amorphous resin as a principal component, and a fluorine atom supported on a surface of the particle body. The resin particle is a particle having a volume average particle size of 70 nm or more. The solid lubricant can sufficiently increase a cleaning effect in the image forming apparatus.
    Type: Grant
    Filed: November 7, 2018
    Date of Patent: November 5, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Taiki Amemiya, Yukio Hosoya, Kunihiro Ogura
  • Patent number: 10451984
    Abstract: A coating film of a coating liquid for a surface layer, the coating liquid containing a hole transporting compound having a chain-polymerizable functional group and a compound having a specified structure, is cured to thereby form a surface layer of an electrophotographic photosensitive member.
    Type: Grant
    Filed: May 3, 2018
    Date of Patent: October 22, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Haruki Mori, Masaki Nonaka, Shinji Takagi, Koichi Nakata
  • Patent number: 10429753
    Abstract: An electrophotographic photoconductor comprises a support, an undercoat layer, a charge generation layer, and a hole transport layer in this order. The undercoat layer comprises an electron transport substance, and the charge generation layer comprises a gallium phthalocyanine crystal and an amide compound represented by formula (N1): where R1 represents a methyl group, a propyl group, or a vinyl group.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: October 1, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kaname Watariguchi, Masato Tanaka, Masataka Kawahara, Jumpei Kuno
  • Patent number: 10367162
    Abstract: A light-emitting device includes an emissive layer that emits light by recombination of first charges and second charges; a first electrode from which the first charges are supplied; a second electrode from which the second charges are supplied; a first charge transport layer that injects the first charges from the first electrode into the emissive layer; and a second charge transport layer that injects the second charges from the second electrode into the emissive layer. At least one of the charge transport layers is an absorbing charge transport layer that includes a light absorbing material that absorbs light within a portion of the emission spectrum of the light emitted by the emissive layer. The absorbing charge transport layer may be an ETL or an HTL, and may be located only between the first electrode and the emissive layer, only between the opposing second electrode and the emissive layer, or between both electrodes and the emissive layer.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: July 30, 2019
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Edward Andrew Boardman, James Andrew Robert Palles-Dimmock, Enrico Angioni, Tim Michael Smeeton
  • Patent number: 10331054
    Abstract: 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.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: June 25, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shohei Urushihara, Masaki Yamada, Takashi Koyanagi, Hideya Arimura
  • Patent number: 10324387
    Abstract: Provided is an electrophotographic photoreceptor obtained by laminating a photosensitive layer and a surface protective layer in this order on a conductive support, wherein the surface protective layer contains conductive fine particles and crosslinkable organic fine particles, and either the conductive fine particles or the crosslinkable organic fine particles have been subjected to surface modification with a fluoroalkyl (meth)acrylate/(meth)acrylic acid copolymer.
    Type: Grant
    Filed: April 9, 2018
    Date of Patent: June 18, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Takeshi Ishida, Seisuke Maeda, Kazuhiro Kuramochi
  • Patent number: 10310395
    Abstract: Provided are an electrophotographic photosensitive member capable of satisfying abrasion resistance and electrical properties and suppressing image deletion, and an electrophotographic apparatus and a process cartridge having the electrophotographic photosensitive member. A surface layer of the electrophotographic photosensitive member contains a polymer of a hole transport material having a polymerizable functional group, wherein the hole transport material has a specific structure.
    Type: Grant
    Filed: June 7, 2018
    Date of Patent: June 4, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koichi Nakata, Haruki Mori, Shinji Takagi, Masaki Nonaka, Ryoichi Tokimitsu
  • Patent number: 10273331
    Abstract: A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R1 and R2 each represent, independently of one another, a hydrogen atom or a methyl group. r and s each represent an integer of at least 0 and no greater than 49. t and u each represent an integer of at least 1 and no greater than 50. r+s+t+u=100. r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), chemical formula (1-2), chemical formula (1-3), or chemical formula (1-4). X and Y are different from one another.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: April 30, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Kenji Kitaguchi, Kensuke Okawa, Seiki Hasunuma, Tomofumi Shimizu
  • Patent number: 10216105
    Abstract: An electrophotographic photosensitive member includes a support member, an electroconductive layer, and a photosensitive layer in this order. The electroconductive layer contains a binder and particles. Each of the particles include a core made of a substance represented by general formula (1), and a coating layer coating the core and containing an electrically conductive material: M1M2O3??(1) wherein M1 represents an element selected from the group consisting of Sr, Li, Na, K, and Ba, and M2 represents an element selected from the group consisting of Ti, Nb, Ta, and Zr.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: February 26, 2019
    Assignee: Canon Kabushiki Kaisa
    Inventors: Kenichi Kaku, Takashi Anezaki, Taichi Sato, Jumpei Kuno, Atsushi Fujii
  • Patent number: 10209638
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer has a single-layer structure and contains a charge generating material and a compound represented by general formula (1) shown below. In the general formula (1), R1 and R2 each represent, independently of each other: an alkyl group having 1 to 12 carbon atoms and optionally substituted by an alkoxy group having 1 to 6 carbon atoms or an alkoxycarbonyl group having 2 to 6 carbon atoms; an aryl group having 6 to 14 carbon atoms and optionally substituted by an alkyl group having 1 to 6 carbon atoms; an aralkyl group having 7 to 20 carbon atoms; or a cycloalkyl group having 3 to 10 carbon atoms. X represents —S— or —SO2—.
    Type: Grant
    Filed: May 7, 2018
    Date of Patent: February 19, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hideki Okada
  • Patent number: 10191398
    Abstract: An electrophotographic photoconductor including a support, an undercoat layer, and a photoconductive layer, the undercoat layer and the photoconductive layer being disposed on the support in an order mentioned, wherein the undercoat layer includes zinc oxide particles, a urethane bond-containing resin, and methylethyl ketone oxime, and the undercoat layer satisfies a formula below: 10<M/L<400??(Formula) where M is a ratio (ppm) of the methylethyl ketone oxime included in the undercoat layer, and L is an average thickness (?m) of the undercoat layer.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: January 29, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshihiro Ishida, Tetsuro Suzuki, Eiji Kurimoto, Tomoharu Asano, Daisuke Nii
  • Patent number: 10175589
    Abstract: A quinone derivative is represented by general formula (1). In general formula (1), at least one of R1-R3 and at least one of R4-R6 each represent, independently of one another, an alkyl group having 4 to 10 carbon atoms or an alkyl group having 2 to 5 carbon atoms that has an aryl group having 6 to 14 carbon atoms. All other of R1-R3 and all other of R4-R6 each represent, independently of one another, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 14 carbon atoms, or a cycloalkyl group having 3 to 10 carbon atoms.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: January 8, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hideki Okada
  • Patent number: 10152002
    Abstract: An electrophotographic photosensitive member includes a support member, an electroconductive layer, and photosensitive layer in this order. The electroconductive layer contains a binder and particles. The particles have a core containing titanium oxide, and a coating layer coating the core and containing titanium oxide doped with niobium or tantalum.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: December 11, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Anezaki, Kenichi Kaku, Taichi Sato, Jumpei Kuno, Atsushi Fujii
  • Patent number: 10139741
    Abstract: The present invention is to provide a charge transport substance having high resistance to stress within electrophotographic processes, an electrophotographic photoreceptor which has excellent high-speed responsiveness, shows a sufficient residual potential, and has high resistance to stress within electrophotographic processes, an electrophotographic cartridge, and an image-forming apparatus. The invention provides a charge transport substance having a specific structure. The invention further provides an electrophotographic photoreceptor including a photosensitive layer which contains the charge transport substance having a specific structure, an electrophotographic cartridge, and an image-forming apparatus, equipped with this electrophotographic photoreceptor.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: November 27, 2018
    Assignee: Mitsubishi Chemical Corporation
    Inventor: Mitsuo Wada
  • Patent number: 10137443
    Abstract: The present invention discloses a composite catalyst for the photocatalytic isomerization of norbornadiene to prepare quadricyclane, comprising: a solid photocatalyst, selected from the group consisting of TiO2, Ti-MCM-41, Ti-SBA-15, ZnO, WO3, Ta2O5 or SrTiO3; and an organic photo-sensitizer loaded on the surface or in the channel of said solid photocatalyst, selected from benzophenone, acetophenone, Michler's Ketone, tetraethyl Michler's Ketone, and diethyl Michler's Ketone, where the organic photo-sensitizer is present in the solid photocatalyst in an amount of 0.5% to 20% by weight. The catalyst of the invention can catalyze a target reaction under the condition that no solvent is used, and the yield of the target product quadricyclane is higher. Furthermore, the catalyst of the invention has a stable activity, and it can be recycled. The invention further discloses a process for preparing the composite catalyst.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: November 27, 2018
    Assignee: TIANJIN UNIVERSITY
    Inventors: Jijun Zou, Xiangwen Zhang, Li Wang, Qingfa Wang
  • Patent number: 10115917
    Abstract: The present teachings relate to hybrid organic-inorganic perovskite solar cells including a hole-transport layer in contact with the perovskite light-absorbing layer, where the hole-transport layer (HTL) is a pristine (undoped) polymer. More specifically, the HTL comprises a copolymer including a benzo[1,2-d;4,5-d?]bistriazole-containing repeating unit and a benzo[1,2-b:4,5-b?]dithiophene-containing repeating unit.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: October 30, 2018
    Assignee: Northwestern University
    Inventors: Tobin J. Marks, Robert P. H. Chang, Teck Lip Dexter Tam, Hsueh-Chung Liao, Antonio Facchetti
  • Patent number: 10095138
    Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed on the conductive substrate, wherein when time that takes for a current value to reach the maximum after beginning of application of a square wave voltage to the electrophotographic photoreceptor is T1 and time that takes for the current value to reach the maximum after the beginning of the application of the square wave voltage and then decrease to one fifth of the maximum is T2, T2 is approximately from 3.2 to 11.0 times as large as T1.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: October 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kosuke Narita, Taketoshi Hoshizaki
  • Patent number: 10073364
    Abstract: Electrophotographic photoreceptor including a conductive substrate, an organic photosensitive layer on an outer peripheral surface of the conductive substrate, and an inorganic protective layer on an outer peripheral surface of the organic photosensitive layer, the inorganic protective layer containing gallium and oxygen. A volume resistivity of an inner region of the inorganic protective layer, the inner region extending 0.2 ?m or about 0.2 ?m from an inner peripheral surface of the inorganic protective layer in a thickness direction, and a volume resistivity of an outer region of the inorganic protective layer, the outer region extending 0.2 ?m or about 0.2 ?m from an outer peripheral surface of the inorganic protective layer in the thickness direction, are both 6.0×107 ?·cm or more and 4.0×108 ?·cm or less or about 6.0×107 ?·cm or more and about 4.0×108 ?·cm or less.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: September 11, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoichi Kigoshi, Masaki Hirakata, Satomi Kashiwagi, Nobuyuki Torigoe, Takeshi Iwanaga, Takashi Imai
  • Patent number: 10067431
    Abstract: An electrophotographic photosensitive member, in which occurrences of image defects are suppressed, and a method for manufacturing the electrophotographic photosensitive member are provided. In addition, a process cartridge and an electrophotographic apparatus, which include the electrophotographic photosensitive member, are provided. The surface layer of the electrophotographic photosensitive member contains a cured material, and the cured material is a copolymer of a hole transport compound having a chain-polymerizable functional group and a vinyl ester compound containing a long-chain alkyl group.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: September 4, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shinji Takagi, Masaki Nonaka, Haruki Mori, Ryoichi Tokimitsu, Koichi Nakata
  • Patent number: 10067432
    Abstract: 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.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: September 4, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazunori Noguchi, Harunobu Ogaki, Kazumichi Sugiyama
  • Patent number: 10036969
    Abstract: An electrophotographic photoreceptor includes a conductive substrate satisfying a condition (A); an undercoat layer satisfying conditions (B) and (C), disposed on the conductive substrate, and containing metal oxide particles; and a photosensitive layer disposed on the undercoat layer: condition (A): in the case where depressions existing in the surface of the conductive substrate are observed with a laser microscope, the width of the largest depression is 400 ?m or less, and the depth of the depression is 15 ?m or less; condition (B): in the case where the undercoat layer is subjected to a Cole-Cole plot analysis, an angular frequency ?max at which a complex impedance component is maximum is from 2.0 rad to 25.0 rad; and condition (C): volume resistivity obtained from the Cole-Cole plot analysis of the undercoat layer is from 7.0×107? to 1.0×109?.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: July 31, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masahiko Miyamoto, Daisuke Haruyama, Shigeto Hashiba
  • Patent number: 9977354
    Abstract: Provided is a lamination-type electrophotographic photoreceptor comprising a conductive substrate, and a charge transport layer and a charge generation layer both on the conductive substrate, wherein the charge transport layer comprises a charge transport substance represented by the general formula (1), a binder resin, and a particulate silicon compound.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: May 22, 2018
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Kazutaka Ida, Akiteru Fujii
  • Patent number: 9964868
    Abstract: The invention relates to a multilayer type electrophotographic photoreceptor comprising: a conductive support; and, on the conductive support, a charge generation layer containing a hydroxygallium phthalocyanine pigment and a charge transport layer, wherein the content of ?-chloronaphthalene in hydroxygallium phthalocyanine pigment in the charge generation layer is in a range of 0 ng/cm2 to 0.1 ng/cm2, the charge transport layer contains a non-halogen organic solvent having a boiling point of 140° C. or more, and the content of the non-halogen organic solvent having a boiling point of 140° C. or more is in a range of 0.1 ?g/cm2 to 5 ?g/cm2.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: May 8, 2018
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventor: Akiteru Fujii
  • Patent number: 9939745
    Abstract: A conductive support for an electrophotographic photoreceptor includes a metallic cylindrical member. The conductive support has a bare area exposed even after a photosensitive layer is disposed on the conductive support, and the outer circumferential surface of at least part of the bare area has a surface residual stress of about ?10 MPa or less.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: April 10, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shiori Okuda, Hiroaki Ogawa, Akihiko Nakamura
  • Patent number: 9939743
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; an undercoat layer disposed on the conductive substrate and containing a binder resin, metal oxide particles, and an electron-accepting compound having an anthraquinone structure; and a photosensitive layer disposed on the undercoat layer, wherein the reflectance RL of the undercoat layer for light having a wavelength ranging approximately from 470 nm to 510 nm is approximately from 2% to 5%.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: April 10, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Taketoshi Hoshizaki
  • Patent number: 9904187
    Abstract: A cylindrical member used in an electrophotographic photoconductor, the cylindrical member includes an impact-pressed cylindrical body containing aluminum and a long-chain fatty acid ester based lubricant that is present on the outer surface of the impact-pressed cylindrical body in an amount of approximately not more than 5.0×10?3 mg/cm2.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: February 27, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kazuya Hongo, Masahiro Andoh
  • Patent number: 9897945
    Abstract: An intermediate transfer belt includes a base layer, an elastic layer, and a surface layer. The elastic layer is composed of an elastomer composition containing an elastomer and metal oxide particles. At least a portion of a surface of the metal oxide particles is positioned at a surface of the elastic layer. At least the portion is coupling-treated with a metal coupling agent. A radical polymerizable functional group of the metal coupling agent is bonded to a radical polymerizable compound composing the surface layer via radical polymerization.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: February 20, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Sadaaki Sakamoto, Takayuki Suzuki, Ito Koga, Eiichi Yoshida
  • Patent number: 9885971
    Abstract: There is provided a charging member capable of preventing the occurrence of abnormal discharge at low temperature and low humidity, and capable of preventing the occurrence of an image defect due to abrasion. The charging member includes a support and a surface layer on the support, and the surface layer contains a specific compound.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: February 6, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kineo Takeno, Noriyuki Doi, Masataka Kodama
  • Patent number: 9864286
    Abstract: An electrophotographic photoreceptor includes an electroconductive substrate, an organic photosensitive layer on the electroconductive substrate and an inorganic protective layer on the organic photosensitive layer, wherein a layer that forms a surface of the organic photosensitive layer contains a charge transporting material, a binder resin, and a silica particle; the inorganic protective layer contains a group 13 element, an oxygen atom, and a hydrogen atom; a sum of element constitution ratios of the group 13 element, the oxygen atom, and the hydrogen atom to all elements constituting the inorganic protective layer is equal to or more than 90 atomic %; and an element composition ratio (oxygen atom/group 13 element) of the oxygen atom and the group 13 element is 1.0 or more and less than 1.5.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: January 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Fumiaki Mera, Nobuyuki Torigoe, Masaki Hirakata, Hideya Katsuhara, Yoichi Kigoshi, Satomi Kashiwagi, Yuko Iwadate, Kenji Kajiwara, Tatsuki Sano, Takashi Imai, Takeshi Iwanaga
  • Patent number: 9851647
    Abstract: A photoconductor that includes, for example, a supporting substrate, an optional ground plane layer, an optional hole blocking layer, an optional adhesive layer, a photogenerating layer, and a charge transport layer, and where the charge transport layer contains a mixture of a charge transport component and a polycarbonate AP.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: December 26, 2017
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Kenny-Tuan Dinh, Lanhui Zhang, Jimmy E. Kelly, Mark S. Thomas, Min-Hong Fu, Lin Ma, Markus R. Silvestri, Marc J. LiVecchi, Robert W. Hedrick, Linda L. Ferrarese
  • Patent number: 9851648
    Abstract: The present invention provides an electrophotographic photosensitive member that allows positive ghost to be reduced even in repeated use. The electrophotographic photosensitive member of the present invention is an electrophotographic photosensitive member wherein an undercoat layer contains a polymerization product of a composition including a compound represented by the following formula (1).
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: December 26, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masashi Nishi, Kunihiko Sekido, Michiyo Sekiya, Kei Tagami, Isao Kawata, Yuto Ito, Akihito Saitoh
  • Patent number: 9829811
    Abstract: An 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, and a binder resin. The hole transport material is a compound represented by the following general formula (1). The binder resin is a resin represented by the following general formula (2). In general formula (1), R1 and R3 each independently represent an alkyl group, an aryl group, an aralkyl group, or an alkoxy group; and R2 and R4 each independently represent an alkyl group, or an alkoxy group. In general formula (2), R23, R24, and R25 each independently represent a hydrogen atom, or a C1-4 alkyl group, at least one of R23, R24, and R25 representing a C1-4 alkyl group; p+q=1.00, and 0.35?p<1.00; and n represents 2 or 3.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: November 28, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Takahiro Oki, Keiji Maruo
  • Patent number: 9783491
    Abstract: A quinone derivative represented by general formula (1) where, in the general formula (1), chemical groups R1 each represent, independently of one another, an alkyl group, a cycloalkyl group, an alkoxy group, an aralkyl group, or an aryl group, and R2 represents an alkyl group, an aralkyl group, a cycloalkyl group, an alkoxy group, an aryl group, or a heterocyclic group.
    Type: Grant
    Filed: November 27, 2015
    Date of Patent: October 10, 2017
    Assignee: KYOCERA Documents Solutions Inc.
    Inventors: Hideki Okada, Fumio Sugai, Kensuke Kojima
  • Patent number: 9783493
    Abstract: A quinone derivative represented by general formula (1), where, in the general formula (1), R1 and R2 each represent, independently of one another, an alkyl group, a cycloalkyl group, an alkoxy group, an aralkyl group, or an aryl group, R3 represents a halogen atom, an alkyl group, an alkoxy group, or an aryl group, m represents an integer of no less than 0 and no greater than 4, and when m represents an integer of no less than 2, chemical groups R3 may be the same as or different from one another.
    Type: Grant
    Filed: November 27, 2015
    Date of Patent: October 10, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hideki Okada, Fumio Sugai, Kensuke Kojima
  • Patent number: 9766560
    Abstract: An electrophotographic photoreceptor for use in an image forming apparatus having a proximity charge-type charging unit includes a conductive support and at least photosensitive layer and surface layer laminated in order on the conductive support, wherein the surface layer includes (A) a charge transport material, (B) a cured product of a composition containing a polymerizable compound and inorganic fine particles, and (C) organic fine particles, and the inorganic fine particles contain a metal oxide, has a surface treated with a surface treatment agent having a reactive organic group, and has a volume resistivity of 1.2×1011?·cm or more.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: September 19, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventor: Masahiko Kurachi