Substituted Patents (Class 430/72)
  • Patent number: 10203616
    Abstract: The present invention relates to an electrophotographic photoreceptor comprising: a conductive support; and a photosensitive layer on the conductive support, wherein the photosensitive layer contains a charge transport substance, a binder resin, and a compound which has a molecular weight of equal to or less than 350, and is represented by General Formula (1).
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: February 12, 2019
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Atsushi Yoshizawa, Wataru Miyashita, Mitsuo Wada, Akiteru Fujii, Takayuki Shouda
  • Patent number: 9746816
    Abstract: The invention is to provide an image forming apparatus and an electrophotographic cartridge, which are free from problems of cleaning failure, filming, soiling, residual images (ghosts), fogging, density reduction, noise and the like and which can provide high-definition images even when a toner having a small particle size and having a high degree of circularity is used and even when a photoreceptor having a small outer diameter is used.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: August 29, 2017
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Tadashi Mizushima, Akiteru Fujii, Takayuki Shoda
  • Patent number: 9529285
    Abstract: A polycarbonate copolymer, a coating liquid and an electrophotographic photosensitive body are provided. The polycarbonate copolymer has good abrasion resistance and stable solubility in an organic solvent. The copolymer comprises a repeating unit A of formula (1); a repeating unit B of formula (2); and a repeating unit C of formula (3), in which: the polycarbonate copolymer has a presence ratio represented by Ar1/(Ar1+Ar2+Ar3) of from 50 to 65 mol %, a presence ratio represented by Ar2/(Ar1+Ar2+Ar3) of from 25 to 45 mol %, and a presence ratio represented by Ar3/(Ar1+Ar2+Ar3) of from 3 to 25 mol %: Ar1, Ar2, and Ar3 are each independently a divalent aromatic group, and X1 and X2 are each independently a single bond or —NH—, provided that Ar1 and Ar2 are not identical to each other. In the copolymer the repeating units B are not directly bonded to each other.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: December 27, 2016
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventor: Kengo Hirata
  • Patent number: 9316915
    Abstract: A negative resist composition comprising a polymer comprising recurring units (a) of formula (1) and having a Mw of 1,000-500,000 as base resin is provided. R1 is H or methyl, X is a single bond or —C(?O)—O—R4—, R2 is a single bond or C1-C4 alkylene, R3 is C2-C8 alkylene, R4 is a single bond or C1-C4 alkylene, and 0<a?1.0. The composition exhibits a high resolution due to controlled acid diffusion and forms a resist film which is unsusceptible to swell in the developer and hence to pattern collapse.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: April 19, 2016
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Jun Hatakeyama, Masayoshi Sagehashi
  • Patent number: 9023564
    Abstract: The present disclosure relates to an azoquinone compound represented by formula (1) below. In formula (1), R1 to R4 are identical or different and each represents a hydrogen atom, a C1 to C6 alkyl group or a C6 to C12 aryl group, and Ar represents a C6 to C12 aryl group.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: May 5, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hideki Okada, Keiji Maruo
  • Publication number: 20140295337
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; a charge generating layer provided on the conductive substrate; a charge transporting layer provided on the charge generating layer, which is configured to include a charge transporting material and a polycarbonate; and an outermost surface layer provided on the charge transporting layer, which is constituted with a cured film formed of a composition including a chain polymerizable compound having at least a charge transporting skeleton and a chain polymerizable functional group in the same molecule, and has an A value represented by the following equation (1) being from 0.1 to 0.3, and a B value represented by the following equation (2) being 0.02 or less, each of which is determined by an Attenuated total reflection Fourier transform infrared spectroscopy: A=(S1/S13)?(S0/S03)??Equation (1) B=S2/S23??Equation (2).
    Type: Application
    Filed: September 3, 2013
    Publication date: October 2, 2014
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yuko IWADATE, Wataru YAMADA, Hidekazu HIROSE, Kenji KAJIWARA, Katsumi NUKADA, Ryo SEKIGUCHI, Takayuki ITO
  • Publication number: 20140255837
    Abstract: Provided is an electrophotographic photosensitive member excellent in suppression of image deletion and electric potential variation. The surface layer of the electrophotographic photosensitive member comprises a hole transporting substance. The hole transporting substance is one of a compound consisting of a carbon atom and a hydrogen atom, or a compound consisting of a carbon atom, a hydrogen atom, and an oxygen atom. The hole transporting substance comprises a conjugate structure containing 24 or more sp2 carbon atoms. The conjugate structure comprises a condensed polycyclic structure comprising 12 or more sp2 carbon atoms. A ratio of a number of sp2 carbon atoms is 55% or more based on a total number of carbon atoms in the hole transporting substance, and a ratio of a number of sp3 carbon atoms is 10% or more based on a total number of carbon atoms in the hole transporting substance.
    Type: Application
    Filed: February 26, 2014
    Publication date: September 11, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Koichi Nakata, Shinji Takagi, Nobuo Kosaka, Koichi Suzuki
  • Publication number: 20140242507
    Abstract: A positively chargeable single-layer electrophotographic photosensitive member includes a single-layer photosensitive layer. The single-layer photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The electron transport material contains two or more compounds selected from the group consisting of compounds represented by the chemical formulas (1) to (4) below.
    Type: Application
    Filed: February 26, 2014
    Publication date: August 28, 2014
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Tomofumi SHIMIZU, Hiroki TSURUMI, Yohei YAMAMOTO, Eiichi MIYAMOTO
  • Publication number: 20140220484
    Abstract: In an electrophotographic photoreceptor having a photosensitive layer on a conductive support, a binder resin that constitutes the photosensitive layer includes a polymer containing a skeleton derived from dehydroabietic acid in the main chain. An electrophotographic photoreceptor which accelerates conversion to natural materials from the viewpoint of manufactured product quality or production suitability, since the binder resin of the photosensitive layer has satisfactory solvent solubility.
    Type: Application
    Filed: April 4, 2014
    Publication date: August 7, 2014
    Applicant: FUJIFILM CORPORATION
    Inventors: Shigeki UEHIRA, Toshihide YOSHITANI
  • Patent number: 8765334
    Abstract: Embodiments pertain to a novel imaging member, namely, an imaging member or photoreceptor comprising a protective outer layer which comprises light-absorbing composition that substantially prevents any light absorption by the overcoat layer. The composition comprises a low strength thermal plastic resin and a high optical density yellow dye. Thus, the light-blocking protective layer reduces the intrinsic light shock suffered by conventional overcoat layers without negatively impacting electrical properties of the overcoat layer and while improving print quality.
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: July 1, 2014
    Assignee: Xerox Corporation
    Inventors: Liang-bih Lin, Kenny-Tuan T. Dinh, Emily K. Redman, Brian P. Gilmartin
  • 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
  • Publication number: 20130316279
    Abstract: A composition according to the present invention contains at least a triarylamine compound and at least one bicyclic compound selected from the group consisting of those of the general formulas [1] to [4], wherein the triaryl amine compound is dissolved in the at least one bicyclic compound where R1 each independently represents a hydrogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group, a fluorine atom or a chlorine atom; A, B, C and F each independently represents either —CR22—, —O— or —NR2—; D and E each independently represents either —CR2? or —N?; G represents —CR22—; H represents —CR2?; and R2 represents a hydrogen atom, a methyl group or a halogen atom.
    Type: Application
    Filed: March 27, 2013
    Publication date: November 28, 2013
    Applicant: Central Glass Company, Limited
    Inventors: Hideaki IMURA, Masamune Okamoto, Naoto Takada
  • Patent number: 8372942
    Abstract: Provided are: a urethane-based polycarbonate resin, including a repeating unit represented by the general formula [1], and a repeating unit represented by the general formula [2], in which the urethane-based polycarbonate resin has high wear resistance by virtue of a strong hydrogen bond between urethane groups; and an electrophotographic photoconductor, including a photosensitive layer provided on a conductive substrate, in which the electrophotographic photoconductor includes the above-mentioned polycarbonate resin as a component of the photosensitive layer, has high wear resistance, and maintains an excellent electrophotographic characteristic over a longtime period: [Chem. 1] (Ar2 represents a group having a divalent aromatic group, and Ar1 represents a divalent aromatic group-containing group having a specific structure).
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: February 12, 2013
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventor: Kengo Hirata
  • Publication number: 20120301179
    Abstract: An electrophotographic photosensitive member has a surface layer that contains a urea compound having two or more urea moieties. Each of the urea moieties has a carbonyl group and two nitrogen atoms. Each of the two nitrogen atoms connects to an alkyl group and a substituted or unsubstituted aryl group or a substituted or unsubstituted arylene group.
    Type: Application
    Filed: May 22, 2012
    Publication date: November 29, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Masaki Nonaka, Masato Tanaka
  • Patent number: 8309696
    Abstract: The present invention provides an azo pigment comprising a group represented by the general formula (1) below, an electrophotographic photosensitive member comprising an intermediate layer comprising the azo pigment, and a process cartridge and an electrophotographic apparatus that comprise the electrophotographic photosensitive member.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: November 13, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Atsushi Fujii, Mai Murakami
  • 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: 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
  • Patent number: 8216752
    Abstract: An objective is to provide an organic photoreceptor exhibiting high sensitivity, suitable for exposure to a semiconductor laser having an emission wavelength of 350-500 nm or a light emitting diode, with which generation of memory images as well as image defects caused by very small charge leakage is inhibited, and also to provide an image forming apparatus fitted with the organic photoreceptor. Also disclosed is an organic photoreceptor possessing a charge generation layer and a charge transport layer provided on a conductive support, wherein the charge generation layer contains particles made of a condensed polycyclic pigment, having an average major axis length of 500 nm or less, an average aspect ratio of 2.5-5.0, and an aspect ratio variation coefficient of 16% or less.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: July 10, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Tomoo Sakimura, Takeshi Ishida
  • Patent number: 8129083
    Abstract: An electrophotographic photoreceptor is disclosed, comprising on or over an electrically conductive support a photosensitive layer containing a charge generation material and a charge transfer material, wherein the charge generation material is comprised of two or more compounds represented by the following formula wherein X and Y are each an alkyl group or a halogen atom, n is an integer of 1 to 6 and m is an integer of 0 to 6, and wherein the compounds differ in at least one of m and n of the formula.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: March 6, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Tomoko Sakimura, Toyoko Shibata, Fumitaka Mochizuki, Shinichi Hamaguchi, Masanori Yumita
  • Publication number: 20110287354
    Abstract: Provided are: a urethane-based polycarbonate resin, including a repeating unit represented by the general formula [1], and a repeating unit represented by the general formula [2], in which the urethane-based polycarbonate resin has high wear resistance by virtue of a strong hydrogen bond between urethane groups; and an electrophotographic photoconductor, including a photosensitive layer provided on a conductive substrate, in which the electrophotographic photoconductor includes the above-mentioned polycarbonate resin as a component of the photosensitive layer, has high wear resistance, and maintains an excellent electrophotographic characteristic over a longtime period: [Chem. 1] (Ar2 represents a group having a divalent aromatic group, and Ar1 represents a divalent aromatic group-containing group having a specific structure).
    Type: Application
    Filed: December 24, 2009
    Publication date: November 24, 2011
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventor: Kengo Hirata
  • Patent number: 8034519
    Abstract: Disclosed is an electrophotographic photoreceptor comprising on or over an electrically conductive support a photosensitive layer containing a pyranthrone compound represented by the following formula and the pyranthrone compound has a crystal structure exhibiting a CuK? X-ray diffraction spectrum having peaks at angles (2?±0.2°) of 12.3°, 20.5°, 25.3° and 28.3°.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: October 11, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Tomoko Sakimura, Toyoko Shibata, Shinichi Hamaguchi
  • Patent number: 8003287
    Abstract: The present invention provides an electrophotographic photoconductor comprising an electroconductive substrate and a photosensitive layer provided on the electroconductive substrate, wherein the photosensitive layer comprises a charge-generating material and a charge-transporting material, the charge-transporting material comprising a compound represented by the general formula (1): wherein Ar1 and Ar2 each independently represent an optionally-substituted arylene or bivalent heterocyclic group; Ar3 and Ar4 each independently represent a hydrogen atom, or an optionally-substituted aryl or monovalent heterocyclic group, but are not simultaneously hydrogen atoms; or Ar3 and Ar4 may be taken together to form an optionally-substituted bivalent cyclic hydrocarbon or heterocyclic group; and n is 0 or 1.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: August 23, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takatsugu Obata, Akihiro Kondoh
  • Patent number: 7985521
    Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and at least one charge transport layer comprised of at least one charge transport component, and wherein at least one of the photogenerating layer and charge transport layer contains an anthracene, including derivatives thereof.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: July 26, 2011
    Assignee: Xerox Corporation
    Inventor: Jin Wu
  • Patent number: 7939155
    Abstract: An organic opto-electronic polymer having the structure of formula (I) is provided: The polymer can be used in the light-emitting layer of an organic light-emitting element as a blue light-emitting material.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: May 10, 2011
    Assignee: Eternal Chemical Co., Ltd.
    Inventors: Ruei-Tang Chen, Yu-Tsai Hsieh
  • Patent number: 7803507
    Abstract: An electrophotographic photoreceptor of high durability capable of providing stable excellent electrical characteristics over a prolonged period of time, which electrophotographic photoreceptor excels in mechanical strength. A photosensitive layer (14) of an electrophotographic photoreceptor (1) includes a polyarylate resin having structural units, for example, those of formula (1) and an enamine compound represented by, for example, formula (2) The variables R1, R2, R3, R4, R7˜R10, X1, Ar1, Ar2, Ar3, Ar4, Ar5, R11, R12, R13, R14, a, m, and n are as defined in the specification. By virtue of these, the electrophotographic photoreceptor (1) of excellent mechanical strength and favorable electrical characteristics can be realized.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: September 28, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tatsuhiro Morita, Tomoko Kanazawa, Akihiro Kondoh, Yohichi Takesawa, Takatsugu Obata, Shinya Mimura, Hiroshi Sugimura
  • Patent number: 7794907
    Abstract: A hydrazone compound capable of realizing an electrophotographic photoreceptor having good electric properties such as good sensitivity and light responsibility, good electric and mechanical durability and good environment stability, is provided. The hydrazone compound is represented by the following general formula (1). The compound is contained in the charge transporting layer of the electrophotographic photoreceptor.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: September 14, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akihiro Kondoh, Takatsugu Obata
  • Patent number: 7754403
    Abstract: An organic photoconductive material which is useful as a raw material compound for a variety of functional materials and makes it possible to implement an electrophotoconductor which is excellent in terms of the charge transporting performance, excellent in terms of dissolution in solvents and compatibility with resins, and excellent in terms of both the electrical properties and durability is provided. An example is an asymmetric bishydroxy compound which can be represented by the following structural formula (1aa). This compound is contained in a charge transforming layer 4 or a surface protective layer 5 of an electrophotoconductor 18. As a result, an electrophotoconductor 18 which is excellent in terms of the electrical properties and durability and can stably form high quality images without image defects such as black dots can be implemented.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: July 13, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akihiro Kondoh, Hiroshi Sugimura, Takatsugu Obata
  • Patent number: 7745083
    Abstract: An electrophotographic photosensitive member has a support, a charge generation layer containing a charge-generating material and a binder resin, provided on the support, and a hole transport layer containing a hole-transporting material, provided on the charge generation layer. The charge generation layer contains a phenanthrene compound having a structure represented by the following formula (2): wherein Z201 and Z202 each independently represent an oxygen atom, a ?C(CN)2 group or a ?N-Ph group; R201 represents a hydrogen atom, a halogen atom, a nitro group, a substituted or unsubstituted alkyl group or a substituted or unsubstituted alkoxy group; and R202 represents a halogen-atom-substituted alkyl group.
    Type: Grant
    Filed: August 10, 2009
    Date of Patent: June 29, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Nagasaka, Kunihiko Sekido, Michiyo Sekiya, Nobumichi Miki, Yosuke Morikawa
  • Patent number: 7727693
    Abstract: An object of the invention is to provide an electrophotographic photoreceptor showing high responsivity even under a low temperature and low humidity circumstance and capable of compatibilize the decrease of the size and the increase in the image forming speed of an electrophotographic apparatus. In a photosensitive layer of an electrophotographic photoreceptor, oxotitanium phthalocyanine having a crystal form showing a diffraction peak at a Bragg angle 2? (error: 2?±0.2°) of 27.2° in an X-ray diffraction spectrum is contained as a charge generating substance, and an enamine compound represented by the general formula for example, the structural formula (1-1) is contained as a charge transporting substance. Accordingly, the electrophotographic photoreceptor showing high responsivity even under a low temperature and low humidity circumstance is realized.
    Type: Grant
    Filed: April 16, 2004
    Date of Patent: June 1, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kazuya Ishida, Akihiro Kondoh, Takatsugu Obata
  • Publication number: 20100075239
    Abstract: The present invention provides an azo pigment comprising a group represented by the general formula (1) below, an electrophotographic photosensitive member comprising an intermediate layer comprising the azo pigment, and a process cartridge and an electrophotographic apparatus that comprise the electrophotographic photosensitive member.
    Type: Application
    Filed: August 31, 2009
    Publication date: March 25, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Atsushi Fujii, Mai Murakami
  • Patent number: 7625681
    Abstract: There is provided an organic photoconductive material that can realize an electrophotographic photoreceptor which is not only excellent in charge transporting ability but also excellent in solubility in a solvent and compatibility with a resin and moreover, which is excellent in both electric properties and durability, and the organic photoconductive material that is useful also as a raw material compound for various types of functional materials. An asymmetric bis-hydroxyenamine compound represented by the following structural formula (1aa) is provided. The compound is allowed to be contained in a charge transporting layer or a surface protective layer of an electrophotographic photoreceptor. This leads realization of the electrophotographic photoreceptor which is excellent in electric properties and durability and can stably form an image of high quality being free of an image defect such as a black spot.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: December 1, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akihiro Kondoh, Hiroshi Sugimura, Takatsugu Obata
  • Patent number: 7625682
    Abstract: An electrophotographic photoreceptor having an organic photosensitive layer at the surface layer is provided which can improve the wear resistance, durability and operation stability of the surface layer and can form images with no injury and unevenness in the density for a long period of time. The electrophotographic photoreceptor includes a conductive substrate, an undercoat layer, and a photosensitive layer having a charge generating layer and a charge transporting layer. In the photoreceptor, the photosensitive layer has a creep value CI? of 2.70% or more and an elastic ratio ?HU of 47% or more in a case where an indentation maximum load of 5 mN is loaded on the surface under a circumstance at a temperature of 25° C. and at a relatively humidity of 50%.
    Type: Grant
    Filed: August 8, 2005
    Date of Patent: December 1, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tomoko Kanazawa, Kotaro Fukushima
  • Patent number: 7588871
    Abstract: An electrophotographic photoreceptor having excellent electric characteristics such as sensitivity characteristic and light responsiveness with an excellent life duration of abrasion resistance so that no flaw and density unevenness are generated on to-be-formed images for a long period of time, is provided. In an electrophotographic photoreceptor (1), an enamine compound represented by the following general formula (1), for example, an enamine compound represented by the following structural formula (1-1) is contained in a charge transporting layer (6), and a creep value (CIT) in a case where a maximum indentation load of 30 mN is put on a surface for 5 seconds under circumstances of temperature of 25° C. and relative humidity of 50%, is set to 2.70% or more and 5.00% or less, and a plastic deformation hardness value (Hplast) of the surface is set to 220 N/mm2 or more and 275 N/mm2 or less.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: September 15, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akiko Kihara, Kotaro Fukushima, Takatsugu Obata
  • Publication number: 20090214969
    Abstract: A photoconductive member a layer including a substantially crosslinked product of a film-forming composition having at least a curing agent and a charge transport compound, wherein the charge transport compound has at least one group imparting charge transporting functionality, at least one crosslinking group and at least one fluorene moiety.
    Type: Application
    Filed: February 26, 2008
    Publication date: August 27, 2009
    Applicant: XEROX CORPORATION
    Inventors: Jennifer A. COGGAN, Nan-Xing HU, Matthew A. HEUFT, Kathy L. DE JONG
  • Patent number: 7563548
    Abstract: An amine compound represented by the general formula (1), which is incorporated as a charge-transporting substance to a charge-transporting layer of an electrophotographic photoreceptor: (in which Ar1, Ar2 and Ar3 each represents an optionally-substituted aryl group, or an optionally-substituted monovalent heterocyclic ring residue. Ar4 represents an optionally-substituted arylene group, or an optionally-substituted bivalent heterocyclic ring residue. R1 represents an optionally-substituted alkyl group, an optionally-substituted aryl group, an optionally-substituted monovalent heterocyclic ring residue, or an optionally-substituted aralkyl group. R2 and R3 each represents a hydrogen atom, an optionally-substituted alkyl group, an optionally-substituted aryl group, an optionally-substituted monovalent heterocyclic ring residue, or an optionally-substituted aralkyl group. n represents an integer of 1 or 2.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: July 21, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akihiro Kondoh, Takatsugu Obata
  • Patent number: 7534539
    Abstract: An object of the invention is to provide a highly reliable electrophotographic photoreceptor having high sensitivity, excellent in light responsivity, not suffering from lowering of such characteristics even when it is used under a low temperature circumstance or in a high speed electrophotographic process, and with less fatigue degradation upon repetitive use. In a photosensitive layer of an electrophotoreceptor, an enamine compound represented by the following general formula (1), for example, the following structural formula is contained as a charge transporting substance, and further at least one of an antioxidant and a light stabilizer is contained. Accordingly, an electrophotographic photoreceptor excellent in sensitivity and light responsivity in various environments, and with less fatigue degradation upon repetitive use is realized.
    Type: Grant
    Filed: May 31, 2004
    Date of Patent: May 19, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takatsugu Obata, Akihiro Kondoh, Kazuya Ishida
  • Patent number: 7517626
    Abstract: An electrophotographic photosensitive member having a support and a photosensitive layer sensitive to semiconductor laser light of wavelength from 380 to 500 nm. The photosensitive layer contains (a) a bisazo pigment (i) of the following Formula (1): wherein R1 and R2 are each an optionally substituted alkyl group or a halogen atom; R3 and R5 are each a hydrogen atom, R4 and R6 are each a 3 substituted phenyl group where the substitutent is Cl, F, Br, I, nitro, trifluoromethyl, trifluromethoxyl, acetyl or cyano; Z1 and Z2 are each an oxygen atom; m1 and m2 are each 0 to 4; and n1, n2 and n3 are 0; or (b) a bisazo pigment (ii) of Formula (1) wherein R1-R6, Z1, Z2 and m1, m2 are as before n1, n2 and n3 are each A1 and A2 are phenylene and A3 is carbonyl.
    Type: Grant
    Filed: March 16, 2007
    Date of Patent: April 14, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Atsushi Fujii, Masato Tanaka
  • Patent number: 7501216
    Abstract: This invention includes an improved organophotoreceptor having an electrically conductive substrate and a photoconductive element on the electrically conductive substrate where the photoconductive element comprises: (a) a charge transport material having the formula Y?N—N?X?N—N?Y? where Y and Y? comprise, each independently, a 9-fluorenylidene group; and X is a conjugated linking group that allows the delocalization of pi electrons over at least Y and Y?, such as a 1,2-ethanediylidene group, a 1,4-phenylenedimethylidyne group, a 2,4-cyclohexadienylidene group, a 2,5-cyclohexadienylidene group, a bicyclohexylidene-2,5,2?,5?-tetraene group, a bicyclohexylidene-2,4,2?,4?-tetraene group, or a combination thereof; and (b) a charge generating compound. Corresponding electrophotographic apparatuses and imaging methods are described.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: March 10, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Nusrallah Jubran, Zbigniew Tokarski, Kam W. Law
  • Patent number: 7479357
    Abstract: An organophotoreceptor that includes: (a) a charge transport material having the formula wherein A is selected from heterocyclic groups, naphthyl group, alkylsulfonylphenyl, stilbenyl or the group X, wherein X is represented by the formula B is selected from hydrogen, alkyl group, and an aryl group, with the proviso that when A is naphthyl, B is naphthyl; or where R1 is selected from the group consisting of N-pyrrolyl, N-pyrazolyl, N-tetrazolyl, N-indolyl, N-carbazolyl, N-triazolyl, N-imidazolyl, N-benzimidazolyl, N-indazolyl, and N-benzotriazolyl group, and R3 is a 9-fluorenone group. (b) a charge generating compound; and (c) an electrically conductive substrate.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: January 20, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski, Alan R. Katritzky, Ritu Jain, Rexiat Maimait, Anatoliy V. Vakulenko
  • Patent number: 7457565
    Abstract: An image forming apparatus having excellent chargeability, sensitivity and light responsivity of an electrophotographic photoconductor and capable of forming images of high quality and high resolution at a high speed in various circumstances, is provided. An electrophotographic photoconductor having a photosensitive layer containing the enamine compound represented by the following general formula (1), for example, the enamine compound represented by the following structural formula (1-1) as a charge transportation substance is mounted to an image forming apparatus and the volume average particle size of the toner contained in a developer 50 housed in a developing device 33 is set to a size from 4 to 7 ?m.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: November 25, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Ichiroh Fujii, Takatsugu Obata, Mikio Kakui
  • Patent number: 7449269
    Abstract: The invention provides an electrophotographic photoreceptor capable of producing high quality images even when development is carried out under low electric potential conditions, and also provides an image forming device incorporating such an electrophotographic photoreceptor. In a photosensitive layer 14 of a photoreceptor 1, the mobility of electric charges is 2×10?6 cm2/(V·s) or greater at an electric field intensity E of 1×105 V/cm. Further, the slope ?in equation 1 representing the mobility of electric charges is 5×10?4 or less in an electric field range of 5×104<E<1×105.
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: November 11, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Hiroshi Sugimura
  • Patent number: 7429439
    Abstract: An electrophotographic photoreceptor of excellent durability having high sensitivity and light responsiveness, not suffering from lowering of the electric characteristics by exposure to light, change of circumstance, or repetitive use, and excellent in the cleaning property and not suffering from lowering of the picture quality of formed images for a long times, in which an enamine compound represented by the general formula (1), for example, an enamine compound represented by the following structural formula (1-1) is incorporated in a photosensitive layer 14, and the surface energy (?) on the surface of the photosensitive layer 14 is set to 20.0 mN/m or more and 35.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: September 30, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Toriyama, Kotaro Fukushima, Takatsugu Obata, Takuya Arimura
  • Patent number: 7416824
    Abstract: According to the present invention, an enamine compound having a specific structure is used as an organic photoconductive material. This enamine compound is obtained based on asymmetrical secondary naphtylamine which is readily available at a lowest price, by introducing phenyl groups containing substituents, as constituents units of the enamine part and presents excellent compatibility with binder resins, will not present detrimental effects such as partial crystallization at film forming and have a high charge mobility. The compound is able to realize highly reliable electrophotographic photoreceptor and an image forming apparatus which present a high electrostatic potential, high sensitivity and high enough light response and are excellent in durability and will not degrade in these characteristics under a low-temperature environment or in a high-speed process and will not lower in these characteristics even due to exposure to light.
    Type: Grant
    Filed: May 10, 2004
    Date of Patent: August 26, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akihiro Kondoh, Takatsugu Obata, Kazuya Ishida
  • Publication number: 20080166645
    Abstract: An organic photoreceptor is described. The photosensitive layer contains a pyranthrone compound represented by Formula 1 which has been subjected to purification processing so as to have a mass reduction ratio D400/450 between 400° C. and 450° C. of not more than 2.0% in a thermogravimetric analysis; D400/450={(G400?G450)/Gi}×100 wherein Gi is a mass at 25° C., and G400 and G450 are each mass at 400° C. and 450° C., respectively, wherein R1 through R14 are each a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a halogen atom, a cyano group or a nitro group. The image forming method using the photoreceptor, and the pyranthrone compound are also disclosed.
    Type: Application
    Filed: October 16, 2007
    Publication date: July 10, 2008
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Toyoko SHIBATA, Tomoko SAKIMURA
  • Patent number: 7345141
    Abstract: The present invention provides a polymer material having a carrier transport property. The polymer material has first and second states in which degrees of the carrier transport property are different from each other, microscopic structures in the first and second states are different from each other, and one of the first and second states can be changed into the other state.
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: March 18, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masanobu Mizusaki, Motohiro Yamahara
  • Patent number: 7344811
    Abstract: Improved organophotoreceptor comprises an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising: (a) a polymeric charge transport material having the formula where n and m are each a distribution of integers, and the n units of R1—Si—X1—Ar1 and m units of R2—Si—X2—Ar2—X3-Z form either a random, an alternative, or a block copolymer; R1 and R2 comprise, each independently, an alkyl group, an alkoxy group, an alkenyl group, an alkynyl group, a heterocyclic group, or an aromatic group; X1, X2, and X3 comprise, each independently, a bond or a linking group; A1 and A2 are each a terminal group; Ar1 and Ar2 comprise, each independently, an aromatic group; and Z comprises a functional group; and (b) a charge generating compound. Corresponding electrophotographic apparatuses, imaging methods, and methods of preparing the polymeric charge transport material are described.
    Type: Grant
    Filed: October 28, 2004
    Date of Patent: March 18, 2008
    Assignee: Samsung Electronic Co., Ltd.
    Inventors: Asta Michaleviciute, Gintaras Buika, Juozas V. Grazulevicius, Zaimantas Peleckas, Edmundas Montrimas, Jonas Sidaravicius
  • Patent number: 7316877
    Abstract: Improved organophotoreceptor comprises an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising: (c) a charge transport material having the formula: R1—N?N—Ar1—X—Ar2—N?N—R2 where R1 and R2 comprise, each independently, a 4-oxo-2,5-cyclohexadiene-1-ylidenyl group; X comprises oxy, thio, sulfonyl, sulfinyl, sulfonyldioxy, azo, carbonyl, thiocarbonyl, carbonyldioxy, oxalyl, an arylene group, an arylenebisazo group, an imino group, a hydrazo group, a carbonimidoyl group, a vinylene group, or a combination thereof; and Ar1 and Ar2 comprise, each independently, an aromatic group; and (b) a charge generating compound. Corresponding electrophotographic apparatuses, imaging methods, and the charge transport material are also described.
    Type: Grant
    Filed: October 29, 2004
    Date of Patent: January 8, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Nusrallah Jubran, Patrick Knoll
  • Patent number: 7309552
    Abstract: To provide a highly sensitive and highly durable electrophotographic photoconductor, electrophotography, photographic apparatus and process cartridge for the electrophotographic apparatus which is practical for a high-speed copying machine as well as for a laser printer. The electrophotographic photoconductor includes a photoconductive layer on a conductive support, in which the photoconductive layer contains an azo compound expressed by Formula (1) and wherein at least one of “Cp1” and “Cp2” contains a coupler residue selected from Formula (2), Formula (3) and Formula (4).
    Type: Grant
    Filed: September 17, 2004
    Date of Patent: December 18, 2007
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuko Arizumi, Masayuki Shoshi
  • Publication number: 20070275314
    Abstract: The present invention provides a diphenyl amine derivative having the excellent solubility to a solvent and compatibility to a binding resin, an efficient production method therefor, and an electrophotographic photoconductor having the excellent sensitivity, capable of effectively preventing generation of the black dots. A diphenyl amine derivative represented by the following general formula (1) is used: (In the general formula (1), R1 to R12 each are a hydrogen atom, an alkyl group which may have a substituent, or the like, Z is a ring structure linked with a benzene ring, which is a 4 to 8-membered ring including a hydrogen atom, a nitrogen atom, an oxygen atom, a carbon atom or a sulfur atom, m1, m2, n1, n2 each are 0 or 1, m1+n1 is 1 or 2, and m2+n2 is 1 or 2.
    Type: Application
    Filed: April 26, 2007
    Publication date: November 29, 2007
    Inventor: Hideki Okada
  • Patent number: 7300732
    Abstract: Improved organophotoreceptor comprises an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising: (a) a charge transport material having the formula, where R comprises a hydrogen, an alkyl group, an alkenyl group, a heterocyclic group, or an aromatic group; X comprises an arylamine group; and Y comprises a 9-fluorenylidene group having at least a solubilizing substituent; and (b) a charge generating compound. Corresponding electrophotographic apparatuses and imaging methods are described.
    Type: Grant
    Filed: February 10, 2004
    Date of Patent: November 27, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Nusrallah Jubran, Zbigniew Tokarski, Kam W. Law