Zinc Containing Patents (Class 430/87)
  • Patent number: 9274423
    Abstract: The present application relates to a fluorine-based resin having a novel structure and a photosensitive resin composition including the same. The photosensitive resin composition including the fluorine-based resin according to an exemplary embodiment of the present application has excellent photosensitivity and developability and can increase a contact angle of a coating film to prevent a water stain. Accordingly, the photosensitive resin composition including the fluorine-based resin according to the exemplary embodiment of the present application may be applied to various photosensitive materials, and particularly, may be preferably applied when a color filter pattern for LCD is manufactured.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: March 1, 2016
    Assignee: LG CHEM, LTD.
    Inventors: Minjung Kim, Han Soo Kim, Kyung Soo Choi
  • Patent number: 9072918
    Abstract: Disclosed is a composition that comprises an effective proportion of a first metal oxide powder having a primary particle size and a secondary particle size selected for the first metal oxide powder to attenuate UVA and an effective proportion of a second metal oxide powder having a secondary particle size selected for the second metal oxide powder to attenuate UVB. The mean secondary particle size of the first metal oxide powder is greater than the mean secondary particle size of the second metal oxide powder. In one embodiment, the first and the second metal oxide powders are both zinc oxide.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: July 7, 2015
    Assignee: Kobo Products, Inc.
    Inventors: David Schlossman, Yun Shao
  • Publication number: 20130236212
    Abstract: An oxide material including gallium, zinc and oxygen, a ratio of the number of atoms of zinc to the number of atoms of gallium (number of atoms of zinc/number of atoms of gallium) being from about 0.01 to about 0.6 and a ratio of the number of atoms of oxygen to the sum of the number of atoms of gallium and the number of atoms of zinc (number of atoms of oxygen/(number of atoms of gallium+number of atoms of zinc)) being from about 1.0 to about 1.6, is disclosed. An electrophotographic photoreceptor including a layer which includes the oxide material is also disclosed. An electrophotographic photoreceptor including a substrate; and a photosensitive layer including gallium, oxygen and zinc is also disclosed.
    Type: Application
    Filed: April 23, 2013
    Publication date: September 12, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shigeru YAGI, Takeshi IWANAGA
  • Patent number: 8071265
    Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, a zinc dithiol containing charge transport layer, a zinc dithiol containing photogenerating layer, or where the charge transport layer and the photogenerating layer both include a zinc dithiol.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: December 6, 2011
    Assignee: Xerox Corporation
    Inventor: Jin Wu
  • Publication number: 20110070536
    Abstract: An oxide material including gallium, zinc and oxygen, a ratio of the number of atoms of zinc to the number of atoms of gallium (number of atoms of zinc/number of atoms of gallium) being from about 0.01 to about 0.6 and a ratio of the number of atoms of oxygen to the sum of the number of atoms of gallium and the number of atoms of zinc (number of atoms of oxygen/(number of atoms of gallium+number of atoms of zinc)) being from about 1.0 to about 1.6, is disclosed. An electrophotographic photoreceptor including a layer which includes the oxide material is also disclosed. An electrophotographic photoreceptor including a substrate; and a photosensitive layer including gallium, oxygen and zinc is also disclosed.
    Type: Application
    Filed: April 26, 2010
    Publication date: March 24, 2011
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shigeru YAGI, Takeshi IWANAGA
  • Patent number: 7608205
    Abstract: Microscopic particle decentralized solution having microscopic particles with different diameters are decentralized, wherein: the microscopic particle decentralized solution has two peaks in a granularity distribution, at a large diameter and a small diameter; and microscopic particle mixtures satisfying the following relationships are decentralized in the solution; R>r and n>3.84×(R/r)3×N, where R is a large particle diameter, r is a small particle diameter, N is the number of large particles, and n is the number of small particle.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: October 27, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Yuichiro Sano, Toru Miyasaka
  • Patent number: 5932381
    Abstract: The present invention relates to an electrophotographic printing plate having high sensitivity to various light sources, high surface smoothness, high water resistance and excellent printability. An electrophotographic lithographic printing plate according to the present invention comprises:a polyester film base having conductive layers on both surfaces thereof so that a surface resistance is from 0.1 to 10.sup.7 .OMEGA./.quadrature., said both surfaces being electrically communicated at an end thereof; anda layer of an electrophotosensitive material, which contains zinc oxide as a photoconductive material and a binder resin and has surface smoothness of 500 to 3000 seconds, provided on one of the surfaces of said base.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: August 3, 1999
    Assignee: Iwatsu Electric Company, Ltd.
    Inventors: Akio Akao, Kazumi Aoba, Hideyuki Yamamoto
  • Patent number: 5852975
    Abstract: The present invention provides a lithographic plate material for a hot-melt type ink-jet printer, characterized in that it comprises an image receiving layer provided on a surface of a flexible plastic film, the image receiving layer being receptive of hot-melt compounds constituting a hot-melt type ink. The image receiving layer, preferably, comprises at least a polymer binder, a pigment becoming hydrophilic upon etching with an etching solution and one or more pigments for imparting unevenness to the surface of the layer. This lithographic plate material is made into a lithographic plate by using the hot-melt type ink-jet printing system. By using this printing system, occurrence of unwanted background image can be completely prevented because there is no possibility of scattering of toner due to electrostatic charging upon peeling.
    Type: Grant
    Filed: August 21, 1996
    Date of Patent: December 29, 1998
    Assignee: Kimoto Co., Ltd.
    Inventors: Masamitsu Miyabe, Takashi Ohkubo
  • Patent number: 5582106
    Abstract: The present invention provides an indirect type lithographic printing original plate which can afford a high-quality print without causing scumming in the background area. The indirect type lithographic printing original plate includes a substrate and a zinc oxide-dispersed resin layer formed on the surface of the substrate, the substrate being a plastic film or sheet containing 1 to 40% by weight of a polymer antistatic agent having a melting point of not less than 90.degree. C., and wherein the polymer antistatic agent is substantially insoluble in water and isopropyl alcohol.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: December 10, 1996
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Kazunori Kanda, Hisaichi Muramoto, Yutaka Kanoi
  • Patent number: 5543258
    Abstract: An original form for electrophotographic planography includes a paper support having thereon a photoconductive layer including a photoconductive material including at least zinc oxide and a resin binder, the exposure percentage of the zinc oxide on a surface of the photoconductive layer being in the range of from 2.1 to 5%.
    Type: Grant
    Filed: June 22, 1994
    Date of Patent: August 6, 1996
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeyuki Dan, Takao Nakayama, Hiroshi Nishizawa, Hidefumi Sera
  • Patent number: 5306586
    Abstract: An electrophotographic imaging member including a charge generating layer and a heterogeneous charge transport layer, the charge transport layer having regions of charge transport and inactive regions and the charge transporting regions are in contact with each other. This imaging member has characteristics that enable high quality and high contrast imaging.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: April 26, 1994
    Assignee: Xerox Corporation
    Inventors: Damodar M. Pai, Andrew R. Melnyk, Milan Stolka
  • Patent number: 5229241
    Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon a photoconductive layer containing at least an inorganic photoconductive substance, a spectral sensitizer and a binder resin, wherein the binder resin contains (1) at least one resin (Resin (A)) having a weight average molecular weight of from 1.times.10.sup.3 to 1.times.10.sup.4 which contains at least 30% by weight of a polymer component represented by the general formula (I) described below and from 0.1 to 10% by weight of a polymer component containing at least one acidic group selected from --PO.sub.3 H.sub.2, --SO.sub.3 H, --COOH, ##STR1## (wherein R represents a hydrocarbon group or --OR' (wherein R' represents a hydrocarbon group), and a cyclic acid anhydride-containing group, and which has at least one acidic group selected from the above-described acidic groups at one terminal of the main chain of the copolymer; ##STR2## wherein a.sub.1 and a.sub.
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: July 20, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Seishi Kasai, Kazuo Ishii
  • Patent number: 5229236
    Abstract: An electrophotographic lithographic printing plate precursor having a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a binder resin, wherein the photoconductive layer contains at least one of the following non-aqueous solvent-dispersed resin grains having an average grain diameter of same as or smaller than the maximum grain diameter of the photoconductive zinc oxide grains: wherein the non-aqueous solvent-dispersed resin grains comprise copolymer resin grains obtained by (i) subjecting to a polymerization reaction in a non-aqueous solvent, a monofunctional monomer (A) being soluble in the non-aqueous solvent but insoluble after polymerization and containing at least one polar group, as described herein, and a monofunctional polymer [M] comprising a polymer principal chain containing at least recurring units each containing a silicon atom and/or fluorine atom-containing substituent, to only one end of which a polymerizable double bond gr
    Type: Grant
    Filed: July 3, 1991
    Date of Patent: July 20, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii, Seishi Kasai, Hirohisa Yamasaki
  • Patent number: 5206105
    Abstract: An electrophotographic light-sensitive material comprising a support having provided thereon a photoconductive layer containing at least an inorganic photoconductive substance and a binder resin, wherein the binder resin comprises (A) at least one AB block copolymer (Resin (A)) having a weight average molecular weight of from 1.times.10.sup.3 to 2.times.10.sup.4 and composed of an A block comprising at least one polymer component containing at least one acidic group selected from --PO.sub.3 H.sub.2, --COOH, --SO.sub.3 H, a phenolic hydroxy group, ##STR1## (wherein R represents a hydrocarbon group or --OR' (wherein R' represents a hydrocarbon group)) and a cyclic acid anhydride-containing group, and a B block containing at least a polymer component represented by the following general formula (I): ##STR2## wherein R.sub.1 represents a hydrocarbon group; and (B) at least one graft type copolymer (Resin (B)) having a weight average molecular weight of from 3.times.10.sup.4 to 1.times.10.sup.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: April 27, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Eiichi Kato
  • Patent number: 5112712
    Abstract: This invention provides an electrophotographic photosensitive material comprising a conductive support having thereon a photoconductive layer containing at least an inorganic photoconductor and a binder resin, wherein the photoconductive layer contains an N-hydroxyimide compound represented by the following general formula (I): ##STR1## wherein Z represents an organic residue capable of forming a cyclic compound having a saturated or unsaturated bond, thereby increasing its photosensitivity and improving its chargeability, dark charge retentivity and photosensitivity over a wide range from visible to infrared regions. Upon actual reproduction, the inventive material provides a fog-free and clear image even under severe conditions such as high temperature and high humidity conditions (e.g., 30.degree. C. and 80% RH).
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: May 12, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Seishi Kasai, Kazuo Ishii, Eiichi Kato
  • Patent number: 5073467
    Abstract: An electrophotographic photoreceptor comprising a support having provided thereon at least one photoconductive layer containing at least inorganic photoconductive particles and a binder resin, wherein the binder resin comprises(A) at least one resin having a weight average molecular weight of from 1.times.10.sup.3 to 2.times.10.sup.4 with at least one substituent selected from the group consisting of (i) --PO.sub.3 H.sub.2, (ii) --SO.sub.3 H, (iii) --COOH, (iv) ##STR1## and (B) at least one copolymer resin comprising a monofunctional macromonomer and a monomer, said monofunctional macromonomer having a weight average molecular weight of not more than 2.times.10.sup.
    Type: Grant
    Filed: October 11, 1989
    Date of Patent: December 17, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 5053301
    Abstract: A lithographic printing plate precursor excellent in oil-desensitivity, whereby an original is faithfully reproduced without occurrence of overall or spotted stains as an offset master is provided, which comprises an electrically conductive support and at least one photoconductive layer, provided thereon, containing photoconductive zinc oxide and a binder resin, in which said photoconductive layer contains hydrophilic resin grains having an average grain diameter of same as or smaller than the maximum grain diameter of said photoconductive zinc oxide grains.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: October 1, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 5049463
    Abstract: An electrophotographic lithographic printing plate precursor, in which the effect by the hydrophilic property of non-image areas is further improved, and which is stable during storage even under very severe conditions and capable of readily realizing the hydrophilic property in a short time during processing of rendering hydrophilic is provided, which utilizes an electrophotographic photoreceptor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a binder resin, wherein said binder resin comprises at least one resin containing at least one polymeric component having at least one of formyl group and functional groups represented by the following General Formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each represent, same or different, hydrocarbon groups or R.sub.1 and R.sub.2 are organic residual radicals which are combined with each other to form a ring.
    Type: Grant
    Filed: October 10, 1990
    Date of Patent: September 17, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Akio Oda, Seishi Kasai
  • Patent number: 5041348
    Abstract: An electrophotographicc lithographic printing plate precursor, in which the effect by the hydrophilic property of non-image areas is further improved, and which is stable during storage even under very severe conditions and capable of readily realizing the hydrophilic property in a short time during processing of rendering hydrophilic is provided, which utilizes an electrophotograhic photoreceptor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a binder resin, wherein said binder resin comprises at least one resin containing at least one polymeric component having at least one of functional groups represented by the following General Formula (I) and General Formula (II): ##STR1## wherein --W.sub.1 -- and --W.sub.2 -- each represent --SO.sub.2 --, --CO-- or --OOC--, n.sub.1 and n.sub.2 each represent 0 or 1 and X represents a halogen atom.
    Type: Grant
    Filed: October 3, 1990
    Date of Patent: August 20, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Akio Oda, Seishi Kasai
  • Patent number: 5017448
    Abstract: An electrophotographic lithographic printing plate precursor is described which utilizes an electrophotographic photoreceptor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises at least one resin which contains at least one kind of functional group capable of producing at least one carboxyl group through decomposition and is crosslinked at least in part to bring about improvements in background stain resistance and printing durability.
    Type: Grant
    Filed: January 27, 1989
    Date of Patent: May 21, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4996121
    Abstract: An electrophotographic lithographic printing plate precursor comprising a conductive support having provided thereon at least one photoconductive layer containing photocondutive zinc oxide and a resin binder is disclosed, wherein the resin binder comprises at least one resin (A) containing at least one functional group capable of forming at least one hydroxyl group upon decomposition and at least one member selected from the group consisting of (B) a heat- and/or photo-curable resin and a crosslinking agent. Since the hydroxyl group formed in the resin (A) enhances hydrophilic properties of nonimage areas, the printing plate obtained from the precursor is resistant to background stains. This effect is further ensured by the crosslinked structure formed between the resin (A) and the resin (B) and/or a crosslinking agent.
    Type: Grant
    Filed: January 4, 1989
    Date of Patent: February 26, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4977049
    Abstract: An electrophotographic lithographic printing plate precursor having an electrophotographic photoreceptor which has at least one photoconductive layer containing a photoconductive zinc oxide and a resin binder on a conductive support, wherein the resin binder contains at least one resin which has at least one functional group capable of forming at least one group selected from a thiol group, a phospho group, an amino group and a sulfo group by decomposition and at least a part of which has been crosslinked.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: December 11, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Eiichi Kato
  • Patent number: 4971871
    Abstract: An electrophotographic lithographic printing plate precursor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises (A) at least one resin containing at least one functional group capable of forming at least one hydrophilic group selected from a thiol group, a phosphono group, an amino group, and a sulfo group upon decomposition and at least one of (B) a heat-curable and photo-curable resin and (C) a crosslinking agent. The printing plate precursor provides a printing plate exhibiting excellent resistance to background stains and printing durability.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: November 20, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4971870
    Abstract: A lithographic printing plate precursor excellent in oil-desensitivity, whereby an original is faithfully reproduced without occurrence of overall or spotted stains as an offset master is provided, which comprises an electrically conductive support and at least one photoconductive layer, provided thereon, containing photoconductive zinc oxide and a binder resin, in which said photoconductive layer contains resin grains containing at least one polymeric component or repeating unit containing at least one functional group capable of producing at least one polar group through decomposition.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: November 20, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4960661
    Abstract: An electrophotographic lithographic printing plate precursor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises (A) at least one resin containing at least one functional group capable of forming at least one carboxyl group upon decomposition and at least one of (B) a heat-curable or a photo-curable resin, and (C) a cross-linking agent. The plate precursor provides a printing plate having excellent resistance to background stains and printing durability.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: October 2, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4929526
    Abstract: An electrophotographic lithographic printing plate precursor obtained from an electrophotographic photoreceptor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises a resin containing at least one functional group capable of forming at least one hydroxyl group upon being decomposed. The printing plate precursor exhibits high image reproducibility, stain resistance, and green preservability, and a printing plate obtained therefrom has high resistance to background stain and has printing durability.
    Type: Grant
    Filed: March 7, 1989
    Date of Patent: May 29, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii, Ryosuke Itakura, Hidefumi Sera
  • Patent number: 4910112
    Abstract: An electrophotographic master plate for lithographic printing is disclosed. The plate comprises a conductive support having thereon at least one photographic layer containing photoconductive zinc oxide and at least one binder resin, wherein at least one functional group contained in at least one component of the binder resin is a group represented by formula (I) ##STR1## wherein X represents ##STR2## wherein Y represents an oxygen atom or a sulfur atom; R.sub.2, R.sub.2, and R.sub.3, each represents a hydrogen atom or an aliphatic group; n represents 5 or 6; Z represents an organic group forming a cyclic imido group; and R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8, each represents a hydrogen atom or an aliphatic group; or at least one of the group R.sub.5 and R.sub.6 and the group R.sub.7 and R.sub.8 combine with each other to form a condensed ring.
    Type: Grant
    Filed: September 1, 1988
    Date of Patent: March 20, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4828952
    Abstract: An electrophotographic printing plate precursor is disclosed, comprising a conductive support having provided thereo1 at least one photoconductive layer containing photoconductive zinc oxide and at least one resin binder, wherein said resin binder contains at least one functional group capable of forming at least one hydroxyl group and at least one carboxyl group upon decomposition. The printing plate precursor can reproduce an image faithful to an original and exhibits satisfactory surface smoothness and electrostatic characteristics. The printing plate produced from the precursor does not cause background stains and exhibits excellent printing durability.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: May 9, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii, Ryosuke Itakura, Hidefumi Sera
  • Patent number: 4792511
    Abstract: An electrophotographic lithographic printing plate precursor is disclosed, comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises a resin containing at least one functional group capable of forming a carboxylic acid upon being decomposed. The printing plate precursor forms an image faithful to an original and causes no background stains because of improved oil-insensitivity of non-image areas, and a printing plate obtained therefrom exhibits high stain resistance and printing durability.
    Type: Grant
    Filed: March 13, 1987
    Date of Patent: December 20, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Ryosuke Itakura, Hidefumi Sera, Kazuo Ishii
  • Patent number: 4673627
    Abstract: An electrophotographic lithographic printing plate is described, comprising an electrically conductive support and a photoconductive layer on the support, said layer being made mainly of a photoconductive zinc oxide and a resin binder, wherein in the surface of the photoconductive layer, the degree of exposure of photoconductive zinc oxide is from 10% to 70%.
    Type: Grant
    Filed: December 26, 1985
    Date of Patent: June 16, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kenji Kunichika, Yoshikatsu Kagawa, Chikashi Ohishi, Sho Nakao, Yasuzi Asao
  • Patent number: 4501808
    Abstract: An organic film comprising at least one compound of the following formulae (1)-(5): ##STR1## wherein R.sub.11 and R.sub.13 each represent substituted or unsubstituted aryl, R.sub.12 represents substituted or unsubstituted arylene, and A.sup..crclbar. represents an anionic residue; ##STR2## wherein R.sub.21, R.sub.22, and R.sub.24 each represent substituted or unsubstituted aryl, R.sub.23 represents substituted or unsubstituted arylene, and A.sup..crclbar. represents an anionic residue; ##STR3## wherein R.sub.31, R.sub.33, and R.sub.35 each represent substituted or unsubstituted aryl, R.sub.32 and R.sub.34 each represent substituted or unsubstituted arylene, and A.sup..crclbar. represents an anionic residue; ##STR4## wherein R.sub.41 represents alkyl, substituted or unsubstituted phenyl, or substituted or unsubstituted styryl, R.sub.42 represents substituted or unsubstituted arylene, R.sub.43 represents substituted or unsubstituted aryl, and A.sup..crclbar.
    Type: Grant
    Filed: August 25, 1983
    Date of Patent: February 26, 1985
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kiyoshi Sakai, Shozo Ishikawa, Tetsuo Arita, Minoru Mabuchi, Shoji Umehara
  • Patent number: 4435493
    Abstract: A reusable electrophotographic element comprising a photoconductive layer containing sensitized zinc oxide particles and first and second binding agents that are incompatible is produced by employing as the first binding agent a macromolecular compound that has a higher affinity to zinc oxide than the second binding agent, is largely deposited on the zinc oxide, has an average molecular weight of at least 12,000 and is present in the photoconductive layer in an amount of 1.5 to 9% by weight calculated on the zinc oxide, with the second binding agent present in substantially larger amount. The photoconductive layer is formed of agglomerates of zinc oxide particles substantially enveloped in the first binding agent, which agglomerates have a diameter of between 2.5 and 6 .mu.m and are stuck together by portions of the second binding agent, thus providing a substantially porous photoconductive layer having a negative charge density of at most 1 m Coulomb per m.sup.2.
    Type: Grant
    Filed: December 10, 1981
    Date of Patent: March 6, 1984
    Assignee: Oce-Nederland B.V.
    Inventors: Jan A. de Putter, Paul J. H. Tummers
  • Patent number: 4357404
    Abstract: A process for preparing a lithographic printing plate from an electrophotographic photosensitive material comprising a photoconductive insulating layer containing photoconductive zinc oxide and a thermoplastic insulating resin disposed on a waterproof support, said method comprising the steps of electrical charging, imagewise exposure, and development of the material in a wet developer having toner particles containing an oleophilic component dispersed in an insulating liquid carrier, thereby providing an oleophilic toner image, and heating the developed photosensitive material under such conditions that when an adhesive tape having a tackiness of 280 to 350 g/10 mm wide portion as measured by the 180.degree. peeling method of JIS C2107 (passed once between pressure rollers at 50 mm/sec) and which has been contact-bonded to the surface of said toner image-bearing photosensitive material by passage between a metal roll and a rubber roll pressed against said roll at a pressure of 6000 g/cm.sup.
    Type: Grant
    Filed: June 4, 1980
    Date of Patent: November 2, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Sadao Osawa, Seiichi Taguchi, Satoru Honjo
  • Patent number: 4308333
    Abstract: A photoconductive material of a fine crystal of a cadmium sulfide-type photoconductive compound, on the surface of the crystal a film-forming compound having a dehydrating function such as an isocyanate compound is deposited. The photoconductive material is employed for forming an electrophotographic material or a photo-cell.
    Type: Grant
    Filed: March 19, 1979
    Date of Patent: December 29, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Noriyoshi Tarumi, Akihiko Tamura, Masakazu Kokiso
  • Patent number: 4298670
    Abstract: This invention is directed to photosensitive material for electrophotography and more particularly it is directed to the improvement of the properties with respect to humidity of photosensitive material by using photoconductive material in combination with ion exchange resin or by using photoconductive material which is previously washed in an aqueous solution in the presence of ion exchange resin.
    Type: Grant
    Filed: April 11, 1979
    Date of Patent: November 3, 1981
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keiichi Murai, Takehiko Matsuo
  • Patent number: 4283473
    Abstract: The present invention relates to an electrophotographic sheet material suitable for use as an offset printing master, comprising: a fibrous substrate, a continuous film of cellulose nitrate thereon and a layer of photo conductive material on said film.
    Type: Grant
    Filed: January 29, 1979
    Date of Patent: August 11, 1981
    Assignee: Domtar Inc.
    Inventors: Colin H. Lewinton, Joseph Savit
  • Patent number: 4283474
    Abstract: An electrophotographic element having a conductive support upon which a coating of oleophilic resin-encapsulated zinc oxide particles, and a sensitizer dispersed in a binder containing vinyl chloride and vinyl acetate polymers is disclosed. Capsule wall can be 5A to 1.mu. thick. The oleophilic resin can be silicone, urethane, epoxy.
    Type: Grant
    Filed: September 19, 1980
    Date of Patent: August 11, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Tadashi Kaneko, Takeo Shimura, Masanori Matsumoto, Hiroyuki Moriguchi, Hiroyuki Nomori
  • Patent number: 4282299
    Abstract: An electrophotographic recording material comprising a photoconductive layer incorporating photoconductive zinc oxide in the presence of a compound within the scope of the following general formula:R--SHwherein: R represents (1) an unsubstituted aliphatic hydrocarbon group containing at least 5 carbon atoms or (2) an aliphatic hydrocarbon group substituted with a --COOQ group wherein Q is an organometallic group or an aliphatic hydrocarbon group, containing at least 5 carbon atoms, or (3) an aliphatic hydrocarbon group substituted with a --COOH group and containing at least two methylene groups between the --COOH group and the --SH group, and said general formula including the modification wherein the hydrogen atom of the --SH group is substituted to form an organometal mercaptide.The above compound improves the charge retention of the photoconductive layer, i.e. lowers its dark-decay, under conditions of high relative humidity.
    Type: Grant
    Filed: September 7, 1978
    Date of Patent: August 4, 1981
    Assignee: Agfa-Gevaert N.V.
    Inventors: Andre R. Suys, Hendrik H. Sneyers
  • Patent number: 4281055
    Abstract: Photosensitive element for electrophotography which comprises(a) a photosensitive layer composed of (1) a binder resin and (2) particles of photoconductive material being dispersed in said binder resin and each particle comprising a photoconductive zinc oxide particle having been encapsulated over its surface with an encapsulating resinous material;(b) an electroconductive support for said photosensitive layer; and(c) an intermediate layer being located between said photosensitive layer and said support, and composed of a water-soluble polymer.The water-soluble polymer preferably is a casein, and a sensitizing agent preferably is adsorbed by the surface of the zinc oxide particle and or included in the encapsulating resinous layer.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: July 28, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Hiroyuki Moriguchi, Satoshi Haneda, Tadashi Kaneko, Akira Itoh, Takeo Shimura, Masanori Matsumoto, Hiroyuki Nomori
  • Patent number: 4279961
    Abstract: An electrostatic record material comprising an electroconductive base sheet and a record layer formed on the base sheet and predominantly containing an insulating resin, the record material being characterized in that the electroconductive base sheet has an electroconductive layer comprising:(i) a zinc oxide powder having a specific resistivity of 0.01 to 900 ohm-cm at pressure of 150 kg/cm.sup.2 ;(ii) a coloring agent having a spectral reflectance of 400 to 530 nm; and(iii) another coloring agent having a spectral reflectance of 580 to 800 nm.
    Type: Grant
    Filed: April 16, 1980
    Date of Patent: July 21, 1981
    Assignee: Kanzaki Paper Manufacturing Co., Ltd.
    Inventors: Hironari Fujioka, Hajime Matsubayashi
  • Patent number: 4271250
    Abstract: The present invention relates to an electrophotographic sheet material suitable for use as an offset printing master, comprising: a fibrous substrate, a continuous film of cellulose nitrate thereon and a layer of photo conductive material on said film.
    Type: Grant
    Filed: November 23, 1979
    Date of Patent: June 2, 1981
    Assignee: Domtar Inc.
    Inventors: Colin H. Lewinton, Joseph Savit
  • Patent number: 4269919
    Abstract: A photoconductive coating which comprises a crystalline deposit of a wholly inorganic material, in the preferred form comprising cadmium sulfide, of almost perfect stoichiometry, either with or without small amounts of dopant.The coating is deposited on a suitable substrate such as a thin, clear, flexible polyester sheet with an intervening layer of ohmic material such as indium-tin oxide in a sputtering method that results in unusual properties. The deposit can be made on metal substrates if desired, but the greater utility is in its application to a transparent substrate so that a transparent electrophotographic member is formed suitable for many uses.Two important properties worthy of mention are that the coating is such that a charge density may be maintained on its surface (surface charge) which is ten to one hundred times greater than known photoconductive coatings and that there is no photoconductive fatigue.
    Type: Grant
    Filed: May 20, 1977
    Date of Patent: May 26, 1981
    Assignee: Coulter Systems Corporation
    Inventor: Manfred R. Kuehnle
  • Patent number: 4242432
    Abstract: A photosensitive material for electrophotography which comprises a conductive support and two or more superimposed photosensitive layers where each layer comprises photoconductive powder and a binder, the particle size of the photoconductive powder in an upper layer being greater than that in a lower layer. Both high photosensitivity and high resistance to electrical impact are imparted to the photosensitive material.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: December 30, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Akira Kato, Akira Itoh, Tohru Uchida
  • Patent number: 4241160
    Abstract: A method for obtaining multiple copies from apparatus including an electrophotographic member of the type in which the latent image is represented by charge not removed when toner is applied and thereafter transferred. The electrophotographic member with its latent image is repeatedly subjected to toning and transfer to respective multiple receptors without intervening charge and exposure. This may be done until the desired number of copies is made or until the image quality deteriorates by reason of dark decay. If additional copies are desired the electrophotographic member is again charged and exposed and thereafter toned and the image transferred repeatedly without intervening additional charge and exposure.Apparatus for effecting the method above and providing structure for carrying out the described steps include other functions such as automatically sensing quality and responding to a condition which requires a new cycle of charge and expose.
    Type: Grant
    Filed: May 25, 1978
    Date of Patent: December 23, 1980
    Assignee: Coulter Systems Corporation
    Inventor: Manfred R. Kuehnle
  • Patent number: 4223084
    Abstract: A photoconductive element giving prolonged service without appreciable deterioration of its properties as the imaging medium in an indirect electrophotograpic copier is obtained by the provision, on an electrically conductive support that preferably is electrically conductive paper coated with a thin layer of hydroxyethyl cellulose, of a photoconductive layer composed essentially of continuous tone zinc oxide and at least one other photoconductive zinc oxide dispersed in a binder consisting predominantly of an organic polymer having an acid number between 10 and 30, such as an acrylic resin or such resin with 1 to 15% of styrene-modified alkyd resin, at a weight ratio of between 5 and 3 parts of zinc oxide per part of binder. The content of continuous tone zinc oxide preferably is limited to a minor proportion amounting to between 6 and 30% of the total zinc oxide content.
    Type: Grant
    Filed: June 10, 1977
    Date of Patent: September 16, 1980
    Assignee: Oce-van der Grinten N.V.
    Inventors: Wilhelmus M. M. Peeters, Wilhelmus J. van Rhijn, Robert M. G. Timmermans
  • Patent number: 4183748
    Abstract: This invention is directed to photosensitive material for electrophotography and more particularly it is directed to the improvement of the properties with respect to humidity of photosensitive material by using photoconductive material in combination with ion exchange resin or by using photoconductive material which is previously washed in an aqueous solution in the presence of ion exchange resin.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: January 15, 1980
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keiichi Murai, Takehiko Matsuo