Radiation-sensitive Composition Or Product Patents (Class 430/56)
  • Publication number: 20130344422
    Abstract: An electrophotographic photoreceptor includes a conductive substrate, an organic photosensitive layer that is provided on the conductive substrate, and an inorganic protective layer that is provided on the organic photosensitive layer, wherein the inorganic protective layer includes a first layer, a second layer, and a third layer in this order from the organic photosensitive layer side and satisfies the relationship of the following expression (1): ?3??1<?2??Expression (1): wherein ?1 represents a volume resistivity (?·cm) of the first layer, ?2 represents a volume resistivity (?·cm) of the second layer, and ?3 represents a volume resistivity (?·cm) of the third layer.
    Type: Application
    Filed: April 3, 2013
    Publication date: December 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takeshi IWANAGA, Masaki HIRAKATA, Hideya KATSUHARA, Tomoya SASAKI, Nobuyuki TORIGOE, Takashi IMAI
  • Patent number: 8614038
    Abstract: The presently disclosed embodiments relate generally to a flexible imaging member having an anti-curl back coating comprising a liquid plasticizer, and the imaging member is substantially flat.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: December 24, 2013
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Edward F. Grabowski
  • Patent number: 8609310
    Abstract: An electrophotographic photoreceptor has at least an electroconductive substrate, and a photosensitive layer formed on or above the electroconductive substrate, wherein an outermost layer of the photoreceptor is a cured membrane of a composition containing at least one compound (a) having in a single molecule thereof a charge transporting skeleton and a chain polymerizable functional group, and at least one thermopolymerizable or photopolymerizable silicone polymeric radical polymerization initiator (b).
    Type: Grant
    Filed: August 14, 2009
    Date of Patent: December 17, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hitoshi Takimoto, Akira Hirano, Takatsugu Doi, Wataru Yamada, Katsumi Nukada
  • Patent number: 8603710
    Abstract: The presently disclosed embodiments related generally to a layer that provides overall flatness to flexible imaging members and components for use in electrostatographic apparatuses. More particularly, the embodiments pertain to a flexible electrophotographic imaging member belt prepared to include an anti-curl back coating formulated to comprise a mechanically robust copolymer binder that does have enhanced wear resistance and improved imaging member curl control.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: December 10, 2013
    Assignee: Xerox Corporation
    Inventor: Robert C. U. Yu
  • Patent number: 8603725
    Abstract: Flexographic printing precursors are prepared using laser-engraveable compositions containing a laser-engraveable resin and chemically-crosslinked organic porous particles. The presence of these porous particles, which can include an infrared radiation absorber, improves various imaging and performance properties in the preparation of flexographic printing members such as flexographic printing plates and printing sleeves.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: December 10, 2013
    Assignee: Eastman Kodak Company
    Inventors: Christine Joanne Landry-Coltrain, Mridula Nair
  • Publication number: 20130323632
    Abstract: Provided are an electrophotographic photosensitive member in which leakage doesn't easily occur, a process cartridge and an electrophotographic apparatus each including the electrophotographic photosensitive member, and a method of manufacturing the electrophotographic photosensitive member. The electrophotographic photosensitive member includes a conductive layer including titanium oxide particle coated with tin oxide doped with a hetero element. When an absolute value of a maximum current amount flowing through the conductive layer in a case of performing a test of applying ?1.0 kV including DC voltage to the conductive layer is defined as Ia, and an absolute value of a current amount flowing through the conductive layer in a case where a decrease ratio of a current amount per minute reaches 1% or less for the first time is defined as Ib, the relations of Ia?6000 and 10?Ib are satisfied. A volume resistivity of the conductive layer before the test is 1.0×108 ?·cm to 5.0×1012 ?·cm.
    Type: Application
    Filed: March 1, 2012
    Publication date: December 5, 2013
    Inventors: Atsushi Fujii, Hideaki Matsuoka, Haruyuki Tsuji, Kazuhisa Shida, Nobuhiro Nakamura
  • Patent number: 8597863
    Abstract: An electrophotographic photoreceptor including a conductive substrate, a photosensitive layer, and a cross-linked resin surface layer comprising a cross-linked resin having a charge transport structure, which satisfies the following inequations: 0.01<WRa(LLH)<0.04??(1-1) 0.01<WRa(LML)<0.04??(1-2) 0.01<WRa(LMH)<0.04??(1-3) 0.01<WRa(LHL)<0.04??(1-4) WRa(LHL)>WRa(LHH)??(2-1) WRa(LHL)>WRa(HLH)??(2-2) WRa(LHL)>WRa(HML)??(2-3) WRa(LHL)>WRa(HMH)??(2-4) WRa(LHL)>WRa(HHL)??(2-5) WRa(LHL)>WRa(HHH)??(2-6) wherein WRa (?m) represents an arithmetic average roughness according to JIS-B0601:2001 of frequency components that are obtained by subjecting a one-dimensional data array of a surface profile of the electrophotographic photoreceptor to a wavelet transformation multiresolution analysis.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: December 3, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Yukio Fujiwara, Kazuhiro Egawa
  • Patent number: 8597549
    Abstract: Disclosed are highly efficient multiphoton absorbing compounds and methods of their use. The compounds generally include a bridge of pi-conjugated bonds connecting electron donating groups or electron accepting groups. The bridge may be substituted with a variety of substituents as well. Solubility, lipophilicity, absorption maxima and other characteristics of the compounds may be tailored by changing the electron donating groups or electron accepting groups, the substituents attached to or the length of the pi-conjugated bridge. Numerous photophysical and photochemical methods are enabled by converting these compounds to electronically excited states upon simultaneous absorption of at least two photons of radiation. The compounds have large two-photon or higher-order absorptivities such that upon absorption, one or more Lewis acidic species, Lewis basic species, radical species or ionic species are formed.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: December 3, 2013
    Assignee: The California Institute of Technology
    Inventors: Brian Cumpston, Matthew Lipson, Seth R. Marder, Joseph W. Perry
  • Patent number: 8597864
    Abstract: Provided is a photoreceptor for electrophotography, a process for producing the photoreceptor, and an electrophotographic apparatus that includes the photoreceptor. The photoreceptor has a photosensitive layer which contains a resin binder that is a copolymerized polyallylate resin. An electrophotographic apparatus having a photoreceptor drum that includes this photoreceptor has a reduced surface frictional resistance throughout the printing period from the beginning to after printing, thus reducing the amount of surface wear while producing satisfactory images.
    Type: Grant
    Filed: February 16, 2009
    Date of Patent: December 3, 2013
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Shinjiro Suzuki, Yoichi Nakamura, Seizo Kitagawa, Fengqiang Zhu, Kazuki Nebashi
  • Patent number: 8597862
    Abstract: A positive charging single-layer electrophotographic photoconductor configured to serve as an image-bearing member for use in an image-forming apparatus includes a photosensitive layer on a conductive base, including a charge-generating material, a hole-transport material, an electron-transport material, and a binder resin, in which the photosensitive layer has a polysiloxane oil, with the amount of the polysiloxane oil being in the range of about 0.005% by mass to about 0.021% by mass with respect to the total mass of materials.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: December 3, 2013
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Kuboshima Daisuke, Shishido Makoto, Yamamoto Yohei, Shimizu Tomofumi, Miyamoto Eiichi
  • Publication number: 20130316276
    Abstract: An electrophotographic photoconductor including, in the order recited: a conductive substrate; an undercoat layer provided on the conductive substrate; and a photoconductive layer provided on the undercoat layer and containing at least a phthalocyanine compound as a charge generation material and, as a resin binder, a polyvinyl acetal resin composed of a repeating unit represented by formula (1): where, in formula (1), R is a hydrogen atom, a methyl group, an ethyl group or a propyl group; x, y and z represent mol % of the respective structural units, where x+y+z=100; n is an integer from 1 to 5; a degree of acetalization (x+z) is 86 to 99 mol %; and a molar ratio (x:z) of the structural units is 95:5 to 50:50.
    Type: Application
    Filed: February 14, 2012
    Publication date: November 28, 2013
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Kazuki Nebashi, Shinjiro Suzuki, Seizo Kitagawa
  • Publication number: 20130316275
    Abstract: An electrophotographic photoreceptor includes a support; an undercoat layer which is provided on the support and contains at least a binder resin, metal oxide particles, and an electron-accepting compound having an anthraquinone structure, in which a content of the electron-accepting compound is from 0.5% by weight to 1.5% by weight with respect to the metal oxide particles and a contact angle of the metal oxide particles with respect to water is from 7° to 12°; and a photosensitive layer which is provided on the undercoat layer.
    Type: Application
    Filed: November 8, 2012
    Publication date: November 28, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Akihiro KAWASAKI, Shigeto HASHIBA, Hirofumi NAKAMURA, Hidemi NUKADA, Satoya SUGIURA
  • Publication number: 20130295497
    Abstract: An electrophotographic photoconductor including: a conductive substrate; and at least a photoconductive layer on the conductive substrate, wherein an uppermost surface layer of the photoconductive layer includes a three-dimensionally crosslinked film formed through polymerization among compounds each containing a charge transporting compound and three or more [(tetrahydro-2H-pyran-2-yl)oxy]methyl groups where the charge transporting compound has one or more aromatic rings and the [(tetrahydro-2H-pyran-2-yl)oxy]methyl groups are bound to the aromatic rings of the charge transporting compound, wherein the polymerization starts after some of the [(tetrahydro-2H-pyran-2-yl)oxy]methyl groups have been partially cleaved and eliminated, and wherein the three-dimensionally crosslinked film has a dielectric constant of lower than 3.5.
    Type: Application
    Filed: January 12, 2012
    Publication date: November 7, 2013
    Inventors: Yuuji Tanaka, Kazukiyo Nagai, Tetsuro Suzuki, Yuusuke Koizuka
  • Publication number: 20130295496
    Abstract: An electrophotographic photoconductor including: a conductive substrate; and at least a photoconductive layer on the conductive substrate, wherein an uppermost surface layer of the photoconductive layer includes a three-dimensionally crosslinked film formed through polymerization among compounds each containing a charge transporting compound and three or more [(tetrahydro-2H-pyran-2-yl)oxy]methyl groups where the charge transporting compound has one or more aromatic rings and the [(tetrahydro-2H-pyran-2-yl)oxy]methyl groups are bound to the aromatic rings of the charge transporting compound, wherein the polymerization starts after some of the [(tetrahydro-2H-pyran-2-yl)oxy]methyl groups have been partially cleaved and eliminated, and wherein the three-dimensionally cross-linked film has an ionization potential of 5.4 or higher.
    Type: Application
    Filed: January 12, 2012
    Publication date: November 7, 2013
    Inventors: Yuuji Tanaka, Kazukiyo Nagai, Tetsuro Suzuki, Yuusuke Koizuka
  • Patent number: 8574798
    Abstract: The present invention provides an electrophotographic photoreceptor having at least a photosensitive layer and a surface layer provided at a surface of the photosensitive layer. The surface layer contains a first layer which is provided at the photosensitive layer side and has a refractive index of n1 and a second layer which is provided at the opposite side of the first layer to the photosensitive layer and has a refractive index of n2. The refractive index of the photosensitive layer, the refractive index of the first layer, the refractive index of the second layer, the film thickness of the first layer, an integer of 0 or more, and the wavelength of light with which the surface of the photoreceptor is irradiated when an electrostatic latent image is formed satisfy specific relationships.
    Type: Grant
    Filed: August 3, 2009
    Date of Patent: November 5, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takeshi Iwanaga, Masayuki Nishikawa, Shigeru Yagi, Nobuyuki Torigoe
  • Publication number: 20130288168
    Abstract: Imaging members having a support, an imaging layer disposed on the support, an outer layer disposed on the imaging layer and fluoropolymer particles imbedded in an outer surface of the outer layer. Image forming apparatuses having such imaging members. Processes for preparing an imaging member for an electrophotographic apparatus, the process involving coating an imaging layer with an outer layer formulation. The imaging layer can be disposed on a support. The outer layer formulation can be dried to form an outer layer disposed on the imaging layer and has an outer surface. Fluoropolymer particles are applied to the outer layer.
    Type: Application
    Filed: April 27, 2012
    Publication date: October 31, 2013
    Applicant: XEROX CORPORATION
    Inventors: Gregory McGuire, Richard Klenkler, Yvan Gagnon, Yu Liu
  • Publication number: 20130288170
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; a single-layer photosensitive layer that is provided on the conductive substrate and includes a binder resin, a charge generation material, a hole transport material, and an electron transport material, wherein a half decay exposure during positive charging is less than or equal to 0.18 ?J/cm2, and a half decay exposure during negative charging is 2 to 12 times the half decay exposure during positive charging.
    Type: Application
    Filed: December 13, 2012
    Publication date: October 31, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yohei SAITO, Koji BANDO, Shinya YAMAMOTO, Masahiro IWASAKI, Takayuki YAMASHITA, Jiro KORENAGA, Yuko YAMANO
  • 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
  • Publication number: 20130280647
    Abstract: This application discloses a photoreceptor comprising a surface layer that is comprised of an organic composition cured by neutral molecular hydrogen bombardment. Methods for forming a photoreceptor having a cured surface are disclosed.
    Type: Application
    Filed: April 24, 2012
    Publication date: October 24, 2013
    Applicant: Xerox Corporation
    Inventors: Yu LIU, Yiliang Wu, Nan-Xing Hu, Gregory M. McGuire, Richard A. Klenkler, Vladislav Skorokhod, Johann Junginger
  • Patent number: 8563203
    Abstract: An electrophotographic photosensitive member is configured such that the average value Hx_ave of the content of hydrogen atoms in a central portion area of a photoconductive layer in a cylindrically axial direction thereof, the content Hx of the hydrogen atoms at an arbitrary point in the central portion area, the average value Hy_ave of the content of the hydrogen atoms in an end area of the photoconductive layer in the cylindrically axial direction thereof, and the content Hy of the hydrogen atoms at an arbitrary point in the end area satisfy 10?Hx_ave?30, Hx<Hy, |Hx_ave?Hx|?5, and 2?Hy_ave?Hx_ave?12.
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: October 22, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuu Nishimura, Hironori Owaki, Daisuke Tazawa
  • Patent number: 8557488
    Abstract: An electrophotographic photosensitive member includes a support and a photosensitive layer. The electrophotographic photosensitive member includes a surface layer that contains a polymer produced by the polymerization of a compound having a chain-polymerizable functional group. The compound having a chain-polymerizable functional group is a compound represented by the following formula (1).
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: October 15, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Nagasaka, Masaki Nonaka, Masato Tanaka
  • Patent number: 8557487
    Abstract: To provide an electrophotographic photoconductor including: a conductive substrate; a photosensitive layer; and a surface layer having grooves which do not intersect each other, the photosensitive layer and the surface layer being laid over the conductive substrate, wherein the grooves each have a width of 60 ?m to 100 ?m and a depth of 0.2 ?m to 2 ?m, wherein the standard deviation of the depths of the grooves is 1/10 or less of the average value of the depths of the grooves measured at any four places, and wherein the grooves are formed in a direction which diagonally crosses a main scanning direction and a sub-scanning direction of the electrophotographic photoconductor.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: October 15, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Kazuhiro Egawa
  • Publication number: 20130260295
    Abstract: Provided is a composition for forming a charge transporting film, including a solvent having a dielectric constant of 5.
    Type: Application
    Filed: September 11, 2012
    Publication date: October 3, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yuko IWADATE, Katsumi NUKADA, Wataru YAMADA, Hidekazu HIROSE, Tomoya SASAKI, Kenji KAJIWARA
  • Patent number: 8546052
    Abstract: An electrophotographic photosensitive member having a surface layer containing a polymeric product obtained by polymerizing a specific adamantane compound, a process cartridge and an electrophotographic apparatus which have the electrophotographic photosensitive member, and a process for producing the electrophotographic photosensitive member.
    Type: Grant
    Filed: May 6, 2011
    Date of Patent: October 1, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masaki Nonaka, Masato Tanaka
  • Patent number: 8546051
    Abstract: A developer bearing member is provided which can charge a toner stably and uniformly during the period from the initial stage to the terminal stage of extensive operation even in various environments. The developer bearing member includes a substrate and an electrically conductive resin coating layer formed on the surface thereof. The electrically conductive resin coating layer is formed from a resin composition containing a phenolic resin having in its structure at least one of an —NH2 group, an ?NH group and an —NH— linkage, a quaternary phosphonium salt and electrically conductive fine particles and the resin composition contains 1 part by mass or more and 60 parts by mass or less of the quaternary phosphonium salt with respect to 100 parts by mass of the phenolic resin.
    Type: Grant
    Filed: July 23, 2009
    Date of Patent: October 1, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Otake, Masayoshi Shimamura, Yasutaka Akashi, Takuma Matsuda, Minoru Ito, Kazuhito Wakabayashi
  • Publication number: 20130252154
    Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer that is provided on the conductive substrate, a charge generation layer that is provided on the undercoat layer, a charge transport layer that is provided on the charge generation layer, and a protective layer that is provided on the charge transport layer and has volume resistivity of 2×1013 ?·m to 4×1013 ?·m, and the work functions and electron affinities of the undercoat layer and the charge generation layer satisfy the following Expression (1): 0.4 eV?(Efuc?Eauc)?(Efcg?Eacg)?0.6 eV (where Efuc represents the work function of the undercoat layer, Eauc represents the electron affinity of the undercoat layer, Efcg represents the work function of the charge generation layer, and Eacg represents the electron affinity of the charge generation layer).
    Type: Application
    Filed: December 20, 2012
    Publication date: September 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yohei SAITO, Shinya YAMAMOTO, Jiro KORENAGA
  • Publication number: 20130252151
    Abstract: An electrophotographic photoreceptor includes a substrate; a photosensitive layer that is provided on the substrate; and a surface layer that is provided on the photosensitive layer, contains fluororesin particles, is a single layer having a thickness of 3 ?m or greater, and has a cross-section, taken along a thickness direction thereof, which satisfies specific expressions.
    Type: Application
    Filed: September 21, 2012
    Publication date: September 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Shinya YAMAMOTO
  • Publication number: 20130252148
    Abstract: An electrophotographic photoreceptor includes a conductive substrate, a photosensitive layer that is provided on the conductive substrate, and a surface layer that is provided on the photosensitive layer or is contained in the photosensitive layer, wherein the surface layer is formed of a cured film of a composition including a first reactive charge transport material having a hydroxyl group and a second reactive charge transport material having a methoxy group, and has an elastic deformation ratio R satisfying the following Expression (1): 0.40?R?0.51.
    Type: Application
    Filed: September 7, 2012
    Publication date: September 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Jiro KORENAGA, Daisuke HARUYAMA
  • Publication number: 20130252147
    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: Application
    Filed: July 30, 2012
    Publication date: September 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Satoya SUGIURA, Shigeto HASHIBA, Kazuhiro KOSEKI, Hirofumi NAKAMURA, Kenta IDE, Akihiro NONAKA, Kosuke NARITA, Akihiro KAWASAKI
  • Publication number: 20130252149
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; an undercoat layer which is provided on the conductive substrate and includes a binder resin and metal oxide particles of which the surfaces are treated with at least two kinds of coupling agents of a first coupling agent having an electron-donating group and a second coupling agent having an electron-accepting group; and a photosensitive layer which is provided on the undercoat layer.
    Type: Application
    Filed: September 10, 2012
    Publication date: September 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Hirofumi NAKAMURA
  • Publication number: 20130252150
    Abstract: Provided is an additive for an electrophotographic photoreceptor which is represented by Formula (I): wherein, A represents an m-valent organic group derived from arylamine represented by Formula (II) or Formula (III); T represents a divalent hydrocarbon group having from 1 to 10 carbon atoms; Rf represents a branched hydrocarbon group having from 3 to 10 carbon atoms in which at least one hydrogen atom is substituted with a fluorine atom; 1 represents 0 or 1; and m represents an integer of 1 to 4: wherein, Ar1, Ar2, and Ar3 each independently represent a substituted or unsubstituted aryl group having from 6 to 20 carbon atoms; Ar4, Ar5, Ar6, and Ar7 each independently represent a substituted or unsubstituted aryl group having from 6 to 20 carbon atoms; and X represents a divalent organic group represented by Formula (IV), Formula (V), or Formula (VI):
    Type: Application
    Filed: September 12, 2012
    Publication date: September 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Masahiro IWASAKI, Yuko YAMANO, Yukimi KAWABATA
  • Publication number: 20130252152
    Abstract: An electrophotographic photoreceptor includes a substrate and a photosensitive layer, wherein the electrophotographic photoreceptor has a surface layer containing fluorine resin particles, and the fluorine resin particles exposed on a surface satisfy the following Expression (1): 0.5?(A)/(B)??10??Expression (1) wherein, (A) represents a number of aggregated particles in which 5 to 20 fluorine resin particles are connected and aggregated, and (B) represents a total number of fluorine resin particles that are isolated without being aggregated and aggregated particles in which 2 to 4 fluorine resin particles are connected and aggregated.
    Type: Application
    Filed: September 28, 2012
    Publication date: September 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Yukimi KAWABATA
  • Publication number: 20130252153
    Abstract: A negative-charge type electrophotographic photoreceptor includes a conductive substrate; an undercoat layer which includes a binder resin and metal oxide particles and in which the work function is from 4.0 eV to 4.7 eV; a charge generation layer in which a difference between the work functions of the charge generation layer and the undercoat layer is from ?4 eV to 0 eV; and a charge transport layer which is provided on the charge generation layer.
    Type: Application
    Filed: October 2, 2012
    Publication date: September 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Shinya YAMAMOTO
  • Publication number: 20130244150
    Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; and an inorganic particulate material, wherein the inorganic particulate material is a zinc oxide doped with a boron group, and wherein the electrophotographic photoreceptor has a surface specific resistivity (R1) not less than 1013 ?/cm2 when the surface layer has an electric field intensity of 1×104 V/cm, and a ratio (R1/R15) of the surface specific resistivity (R1) to a surface specific resistivity (R15) when the surface layer has an electric field intensity of 1.5×105 V/cm of from 100 to 5,000.
    Type: Application
    Filed: March 5, 2013
    Publication date: September 19, 2013
    Inventors: Tetsuya Toshine, Hiroshi Ikuno, Naohiro Toda, Takafumi Iwamoto, Kazuhiro Egawa, Toshihiro Ishida
  • Patent number: 8535863
    Abstract: A photoreceptor including an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate; and a crosslinked outermost layer located overlying the photosensitive layer and including a crosslinked material and a specific carbazole compound serving as a charge transport material. An image forming apparatus including the photoreceptor; a charger to charge the photoreceptor; an irradiator to irradiate the charged photoreceptor to form an electrostatic latent image thereon; a developing device to develop the electrostatic latent image with a developer including a toner to form a toner image on the photoreceptor; and a transferring device to transfer the toner image onto a recording material.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: September 17, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoharu Asano, Hiroshi Ikuno, Yasuhito Kuboshima, Yuuji Tanaka
  • Publication number: 20130236822
    Abstract: An image forming apparatus includes an electrophotographic photoreceptor, a charging unit charging the electrophotographic photoreceptor, an exposing unit exposing the charged electrophotographic photoreceptor to form an electrostatic latent image, a developing unit developing the electrostatic latent image to form a toner image, and a transferring unit transferring the toner image to a recording medium, but includes no erasing unit erasing the electrophotographic photoreceptor after the toner image is transferred and before the electrographic photoreceptor is charged. The electrophotographic photoreceptor has an undercoat layer and a photosensitive layer on a conductive substrate. The undercoat layer has metallic oxide particles and an electron-accepting compound. The electron-accepting compound is included at 1 part by weight to 5 parts by weight with respect to 100 parts by weight of the metallic oxide particles. A volume resistivity of the undercoat layer is in a range of 1.0×109 ?m to 1.0×1010 ?m.
    Type: Application
    Filed: September 7, 2012
    Publication date: September 12, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Keiko ONO, Kosuke NARITA, Hirofumi NAKAMURA
  • Publication number: 20130236820
    Abstract: An image forming apparatus includes at least an electrophotographic photoreceptor having at least a conductive support, an undercoat layer, and a photosensitive layer; a charging device that charges the surface of the electrophotographic photoreceptor in a contact charging mode, in which only DC voltage is applied; an electrostatic latent image forming device that exposes the surface of the charged electrophotographic photoreceptor to form an electrostatic latent image; a developing device that develops the electrostatic latent image by a developer to form a toner image; and a transfer device that directly transfers the toner image from the electrophotographic photoreceptor to a transfer medium; and does not include an erasing device for erasing the surface of the electrophotographic photoreceptor after the toner image is transferred onto the transfer medium by the transfer device and before the surface of the electrophotographic photoreceptor is charged by the charging device.
    Type: Application
    Filed: July 20, 2012
    Publication date: September 12, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Kenta IDE, Kosuke NARITA, Hirofumi NAKAMURA, Kazuhiro KOSEKI, Akihiro KAWASAKI, Shigeto HASHIBA, Takahiro SUZUKI
  • 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
  • Publication number: 20130236823
    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 ?, and a domain comprising a component ?.
    Type: Application
    Filed: November 25, 2011
    Publication date: September 12, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kazunori Noguchi, Takashi Anezaki, Kazuhisa Shida, Atsushi Okuda, Shio Murai, Harunobu Ogaki
  • Patent number: 8530124
    Abstract: A hydroxygallium phthalocyanine composite pigment, which is a composite pigment wherein an azo compound expressed by the following general formula (a) is conjugated to a hydroxygallium phthalocyanine pigment, wherein the hydroxygallium phthalocyanine composite pigment has diffraction peaks at least at 7.5°, 9.9°, 12.5°, 16.3°, 18.6°, 25.1°, and 28.3° on an X-ray diffraction spectrum with Bragg angle of 2?±0.2°, using Cu—K? X-rays: A(H)n??General Formula (a) where A is a residue of an azo compound; H is a hydrogen atom; the residue A is bonded to one or more hydrogen atoms, where the number of the hydrogen atoms is expressed with n, via one or more heteroatoms which are selected from the group consisting of N and O, and form part of the residue A; and n is an integer of 1 to 9.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: September 10, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiromi Sakaguchi, Masafumi Ohta, Yoshiki Yanagawa
  • Patent number: 8530123
    Abstract: The invention provides an electrophotographic photoreceptor for use in an image-forming apparatus comprising a charging unit which charges an electrophotographic photoreceptor, an exposure unit which exposes the charged electrophotographic photoreceptor to light to form an electrostatic latent image on the electrophotographic photoreceptor, and a developing unit which develops the electrostatic latent image, wherein the electrophotographic photoreceptor comprises a conductive substrate and a photosensitive layer and the photosensitive layer contains a compound represented by the following formula (1).
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: September 10, 2013
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Kumiko Fujiwara, Teruyuki Mitsumori, Hiroaki Fujiwara
  • Publication number: 20130230800
    Abstract: The invention provides a laminate-type electrophotographic photoreceptor for use in a negative charge system, comprising a conductive support, and a photosensitive layer containing a charge generation layer and a charge transport layer, on the conductive support, wherein in addition to a fluorene compound and a diamine compound which are responsible for charge transport, a compound having a specific structure is used in combination.
    Type: Application
    Filed: March 4, 2013
    Publication date: September 5, 2013
    Applicant: Mitsubishi Chemical Corporation
    Inventor: Akiteru Fujii
  • Patent number: 8524433
    Abstract: An electrophotographic photoconductor includes a conductive substrate and an outermost surface layer formed on the conductive substrate and containing a binder resin and a copolymer derived from a reactive monomer having charge transport property and a reactive monomer having no charge transport property, the copolymer having a side chain with 4 or more carbon atoms in a constitutional unit derived from the reactive monomer having no charge transport property.
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: September 3, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takatsugu Doi, Wataru Yamada, Yuko Iwadate, Katsumi Nukada
  • Patent number: 8518619
    Abstract: Provided is to provide a photoelectric conversion device including an organic compound layer which contains polymer (a) having partial structures represented by the following formulae (1) and (2) respectively. In the formula, R1, R2, R3 each independently represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, X and Y each independently represent a divalent organic group having from 1 to 20 carbon atoms, a represents 0 or 1, and CT represents an organic group having a charge transportable skeleton.
    Type: Grant
    Filed: February 11, 2011
    Date of Patent: August 27, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Katsumi Nukada, Wataru Yamada, Takatsugu Doi
  • Patent number: 8518617
    Abstract: The present invention provides an electrophotographic photoreceptor including at least an electroconductive substrate and a photosensitive layer provided on or above the electroconductive substrate, wherein an outermost layer of the electrophotographic photoreceptor is a layer composed of a cured film of a composition including at least one of compound having a chain-polymerizable functional group and a charge-transportable backbone in the molecule thereof, a polymerization initiator and a radical deactivator.
    Type: Grant
    Filed: September 8, 2010
    Date of Patent: August 27, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Tsuyoshi Miyamoto, Wataru Yamada, Takatsugu Doi, Kenya Sonobe, Katsumi Nukada
  • Patent number: 8512924
    Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer; a crosslinked surface layer comprising ?-alumina and tin oxide, wherein a first one-dimensional data array obtained from measuring a concavo-convex shape of the surface of the photoreceptor is subjected to a wavelet conversion to be separated into 6 frequency components, the one-dimensional data array of the lowest frequency component is further thinned so as to have 1/40 data arrays to obtain a second one-dimensional data array, the second one-dimensional data array is further subjected to the wavelet conversion to be separated into additional 6 frequency components, and wherein when relationships between respective arithmetic average roughness (WRa) (y-axis) of the 12 frequency components and the frequency components (x-axis) are graphed, at least WRa (214 to 551 ?m) and WRa (26 to 106 ?m) have a folding point or a maximum point.
    Type: Grant
    Filed: February 2, 2011
    Date of Patent: August 20, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Hidetoshi Kami, Kazuhiro Egawa, Yukio Fujiwara
  • Publication number: 20130209929
    Abstract: An electrophotographic photoreceptor, an electrophotographic photoreceptor cartridge, and an image forming apparatus, which are excellent in electrical characteristics such as a responsivity and at the same time, excellent in the crack resistance, are provided. Two kinds of charge transport substances each having a specific structure and a polycarbonate resin having a specific structure are combined, whereby the electrical characteristics such as responsivity and the crack resistance can be improved at the same time.
    Type: Application
    Filed: February 7, 2013
    Publication date: August 15, 2013
    Applicant: Mitsubishi Chemical Corporation
    Inventor: Mitsubishi Chemical Corporation
  • Publication number: 20130209928
    Abstract: An electrophotographic photoreceptor, an electrophotographic photoreceptor cartridge, and an image forming apparatus, which are excellent in electrical characteristics such as a responsivity and at the same time, excellent in the crack resistance, are provided. Two kinds of charge transport substances each having a specific structure and a polyester resin having a specific structure are combined, whereby the crack resistance can be improved.
    Type: Application
    Filed: February 7, 2013
    Publication date: August 15, 2013
    Applicant: Mitsubishi Chemical Corporation
    Inventor: Mitsubishi Chemical Corporation
  • Publication number: 20130202994
    Abstract: To provide an amine compound, represented by General Formula (I) below: [In General Formula (I), R1 and R2 represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aromatic hydrocarbon group, which may be identical or different; m and n are an integer of 1 or 0; Ar1 represents a substituted or unsubstituted aromatic hydrocarbon group; Ar2 and Ar3 represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aromatic hydrocarbon group; and Ar1 and Ar2 or Ar2 and Ar3 may bind to each other to form a substituted or unsubstituted heterocyclic group including a nitrogen atom.
    Type: Application
    Filed: January 29, 2013
    Publication date: August 8, 2013
    Inventors: Tomoyuki SHIMADA, Masayoshi NOMURA, Ryota ARAI
  • Publication number: 20130189610
    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 perylene-tetracarbonic acid amide pigment having blue wavelength photosensitivity of the following formula: wherein each of R1, R2, R3, R4, R5, R6 and R7 are the same or different and are independently selected from the group comprising 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 20, 2012
    Publication date: July 25, 2013
    Applicant: XEROX CORPORATION
    Inventors: Cuong Vong, Jennifer A. Coggan, Gregory M. McGuire