Donor-acceptor Complex Photoconductor Patents (Class 430/900)
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Publication number: 20040197685Abstract: A photoconductive imaging member comprised of a supporting substrate, and thereover a single layer comprised of a mixture of a photogenerator component, charge transport components, and a certain electron transport component, and a certain polymer binder.Type: ApplicationFiled: April 4, 2003Publication date: October 7, 2004Applicant: Xerox CorporationInventors: Andronique loannidis, Nancy L. Belknap, Cindy C. Chen, Lanhui Zhang, Timothy P. Bender, John F. Graham, Ah-Mee Hor, James M. Duff
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Publication number: 20040018440Abstract: A member including for example, a supporting layer and a single photogenerating layer, the photogenerating layer comprising particles including hydroxygallium phthalocyanine phthalocyanine Type V, x polymorph metal free phthalocyanine, or chlorogallium phthalocyanine dispersed in a matrix comprising an arylamine hole transporter and an electron transporter selected from the group consisting of N,N′bis(1,2-dimethylpropyl)-1,4,5,8-naphthalenetetracarboxylic diimide, 1,1′-dioxo-2-(4-methylphenyl)-6-phenyl-4-(dicyanomethylidene)thiopyran, and a quinone selected from the group consisting of carboxybenzylhaphthaquinone, and tetra (t-butyl) diphenoquinone, and mixtures thereof, and a film forming binder.Type: ApplicationFiled: July 23, 2002Publication date: January 29, 2004Applicant: Xerox CorporationInventors: Liang-Bih Lin, Cindy C. Chen, James M. Duff, Timothy P. Bender, Harold F. Hammond, James M. Markovics, Linda L. Ferrarese, John S. Chambers, Anna M. Main
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Patent number: 6656650Abstract: A member including, for example, a supporting layer and a single photogenerating layer, the photogenerating layer comprising particles including hydroxygallium phthalocyanine phthalocyanine Type V, x polymorph metal free phthalocyanine, or chlorogallium phthalocyanine dispersed in a matrix comprising an arylamine hole transporter and an electron transporter selected from the group consisting of N,N′bis(1,2-dimethylpropyl)-1,4,5,8-naphthalenetetracarboxylic diimide, 1,1′-dioxo-2-(4-methylphenyl)-6-phenyl-4-(dicyanomethylidene)thiopyran, and a quinone selected from the group consisting of carboxybenzylhaphthaquinone, and tetra (t-butyl) diphenoquinone, and mixtures thereof, and submicrometer size polytetrafluroethylene particles, and a film forming binder.Type: GrantFiled: July 2, 2002Date of Patent: December 2, 2003Assignee: Xerox CorporationInventors: Liang-Bih Lin, Helen R. Cherniack, John S. Chambers, Anna M. Main, Huoy-Jen Yuh, Cindy C. Chen, James M. Duff, Timothy P. Bender
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Patent number: 6168850Abstract: A composition for a photo-conductive layer and an electron transferring complex system on a color CRT panel having 1-(p-diethylaminophenyl)-1,4,4-triphenyl-1,3-butadiene as an electron donor and a thioxanthene derivative as an electron acceptor in an organic binder dispersion system have not only a high electron transferring capability but also a high electron generating capability so that it is not necessary to add a separate electron generating material.Type: GrantFiled: June 9, 1998Date of Patent: January 2, 2001Assignee: Samsung Display Devices Co., Ltd.Inventors: Min-Ho Kim, Jae-Ho Sim
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Patent number: 5883220Abstract: The copolymer described is a segmented copolymer consisting essentially of organic segments A which have a number i of reactive ends such that i is from 1 to 6 inclusive, and segments B which have a number j of reactive ends such that j is from 1 to 6 inclusive. The segments B have redox properties and each segment A is connected to at least one segment B by a group Y and vice versa, the group Y being an ether, thioether, secondary amine, tertiary amine, secondary amide, tertiary amide, imide, quarternary ammonium group, or a group having a carbon--carbon bond. The respective weighted molar mean of i and j is 2 or more. Application to electrochemical generators and electrochromic systems.Type: GrantFiled: August 21, 1997Date of Patent: March 16, 1999Assignees: Centre National de la Recherche Scientifique, Hydro-QuebecInventors: Michel Armand, Daniel Baril, Yves Choquette, Christophe Michot, Jean-Yves Sanchez
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Patent number: 5376487Abstract: The present invention provides a laminated-type photosensitive member having a photosensitive layer comprising;a charge generating layer anda charge transporting layer having a layer thickness of 25 .mu.m or more and containing an arylamine compound as a charge transporting material and an electron-accepting compound having an electron; affinity of 0.85-1.0 eVon an electrically substrate.Type: GrantFiled: October 5, 1993Date of Patent: December 27, 1994Assignee: Minolta Camera Kabushiki KaishaInventor: Hideaki Ueda
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Patent number: 5286589Abstract: An electrophotographic photosensitive member has a photosensitive layer on an electroconductive support. The photosensitive layer comprises a compound having a structure represented by the general formula (1) or (2) as a charge-generating material: ##STR1## wherein A.sub.1 and A.sub.3 are respectively an alkyl radical, an aralkyl radical, an aromatic radical or a heterocyclic radical which may have a substituent; A.sub.2 is hydrogen atom, or an alkyl radical, an aralkyl radical, an aromatic radical, or a heterocyclic radical which may have a substituent; A.sub.1 and A.sub.2 may be the same with or different from each other; A.sub.1 and A.sub.2 may be linked together to form a ring; and n is an integer of 1, 2, or 3.Type: GrantFiled: November 12, 1992Date of Patent: February 15, 1994Assignee: Canon Kabushiki KaishaInventors: Shintetsu Go, Kazushi Iuchi, Toshie Miyaji, Hajime Miyazaki, Hideyuki Takai, Masakazu Matsumoto
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Patent number: 5250378Abstract: The disclosed invention relates to novel charge-transfer complexes comprising fullerenes and electron donating components, and to photoconductive compositions containing fullerenes. These compositions are useful in electrostatic imaging.Type: GrantFiled: September 30, 1992Date of Patent: October 5, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ying Wang
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Patent number: 5215841Abstract: An electrophotographic imaging system utilizing a member comprising at least one photoconductive layer and an overcoating layer comprising a film forming continuous phase comprising charge transport molecules and charge injection enabling sites comprising finely divided fullerene particles, the insulating overcoating layer being substantially transparent to activating radiation to which the photoconductive layer is sensitive and substantially electrically insulating at low electrical fields.Type: GrantFiled: December 30, 1991Date of Patent: June 1, 1993Assignee: Xerox CorporationInventors: Merlin E. Scharfe, Ronald F. Ziolo, Joseph Mammino, Donald S. Sypula
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Patent number: 5200286Abstract: An electrophotographic photoreceptor is disclosed, comprising a substrate having thereon at least an electric charge generating layer and an electric charge transporting layer, characterized in that the electric charge generating layer is formed from a coating solution which is prepared by dispersing an electric charge generating material and an acid in a binder resin solution. Useful acids are inorganic acids, including hydrochloric acid, sulfuric acid, hydrobromic acid and phosphoric acid, and organic acids, including formic acid, acetic acid, propionic acid, butryric acid, lactic acid, benzoic acid and sulfonic acid. This material has an increased sensitivity and thus can be effectively used in copying machines.Type: GrantFiled: February 6, 1991Date of Patent: April 6, 1993Assignee: Fuji Xerox Co., Ltd.Inventors: Yuichi Yashiki, Kazuya Hongo, Seiji Ashiya
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Patent number: 5153085Abstract: An electrophotographic photosensitive member has a charge-generating layer which includes selected photosensitive pigment particles and a compound which is a tetracyanoanthraquinodimethane compound, an anthraquinone compound, a dicyanovinyl compound, or a special quinone compound. The compound is incorporated in an amount in a range from 0.01 to 2 molar equivalents, preferably 0.1 to 1 molar equivalent, to the pigment, which has a positive hole transporting property. The photossensitive member has a charge-transporting layer and can also have a protective layer. The pigment is a phthalocyanine series pigment, a squearyrium series p igment, or a perylene series pigment. A process of using the photosensitive member includes reversal development and multicolor toner transfer. It is found that the process is adaptable to change in size of the transfer medium.Type: GrantFiled: October 16, 1991Date of Patent: October 6, 1992Assignee: Fuji Xerox Co., Ltd.Inventors: Yutaka Akasaki, Hidekazu Aonuma, Kazuya Hongo, Katsuhiro Sato, Katsumi Nukada, Teruumi Marumo
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Patent number: 5145759Abstract: An electrophotographic recording material comprising on an electrically conductive support a negatively chargeable photoconductive recording layer which contains in an electrically insulating organic polymer binder material at least one photoconductive n-type pigment substance and at least one p-type photoconductive charge transport substance as defined herein by a general formula (I) to (V), wherein said layer has a thickness in the range of 4 to 40 .mu.m and comprises 8 to 80% by weight of said n-type pigment substance and 0.01 to 40% by weight of said p-type charge transport substance that is molecularly distributed in said electrically insulating organic polymeric binder material that has a voluem resistivity of at least 10.sup.14 Ohm-m, and wherein said recording layer in electrostatically charged state requires for 10% and 90% discharge respectively exposures to conductivity increasing electromagnetic radiation that differ by a factor 4.5 or less.Type: GrantFiled: April 16, 1990Date of Patent: September 8, 1992Assignee: AGFA-Gevaert, N.V.Inventors: David R. Terrell, Stefaan K. De Meutter, Marcel J. Monbaliu
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Patent number: 5128226Abstract: A photoconductor element of the type comprising successive layers of a support layer, a barrier layer, a charge generation layer, and an n-type charge transport layer wherein the barrier layer is less than about 1.0 micron in thickness and is comprised of (1) at least one monoethylenically unsaturated aliphatic dicarboxylic acid anhydride containing 4 through 8 carbon atoms per molecule, and (2) at least one vinyl monomer wherein the weight ratio of (1) to (2) is in the range of about 10:1 to 1:10.Type: GrantFiled: December 4, 1991Date of Patent: July 7, 1992Assignee: Eastman Kodak CompanyInventor: Yann Hung
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Patent number: 5112759Abstract: An electrophotographic photosensitive member comprises an electroconductive support and a photosensitive layer laid on the electroconductive support, the photosensitive layer containing a compound represented by the following general formula (1): ##STR1## wherein R in a substituted or unsubstituted aromatic group or heterocyclic group; X is substituted or unsubstituted benzenediyl, 2,3-pyridinediyl, 3,4-pyridinediyl or 2,3-pyrazinediyl; Y is an oxygen atom, a sulfur atom or a dicyanomethylene group, Z is an oxygen atom, a sulfur atom, a dicyanomethylene group or ##STR2## m is an integer of 1 2 or 3; and n is an integer of 0 or 1.Type: GrantFiled: March 30, 1990Date of Patent: May 12, 1992Assignee: Canon Kabushiki KaishaInventors: Akihiro Senoo, Kazushi Iuchi, Hajime Miyazaki, Shintetsu Go, Toshie Miyaji
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Patent number: 5085960Abstract: An electrophotographic photosensitive member has a charge-generating layer which includes selected photosensitive pigment particles and a compound which is a tetracyanoanthraquinodimethane compound, an anthraquinone compound, a dicyanovinyl compound, or a special quinone compound. The compound is incorporated in an amount in a range from 0.01 to 2 molar equivalents, preferably 0.1 to 1 molar equivalent, to the pigment, which has a positive hole transporting property. The photosensitive member has a charge-supporting layer and can also have a protective layer. The pigment is a phthalocyanine series pigment, a squearyrium series pigment, or a perylene series pigment. A process of using the photosensitive member includes reversal development and multicolor toner transfer. It is found that the process is adaptable to change in size of the transfer medium.Type: GrantFiled: June 20, 1991Date of Patent: February 4, 1992Assignee: Fuji Xerox Co., Ltd.Inventors: Yutaka Akasaki, Hidekazu Aonuma, Kazuya Hongo, Katsuhiro Sato, Katsumi Nukada, Teruumi Marumo
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Patent number: 5077156Abstract: Substrates which have been coated with a mixture of a radiation-sensitive organic material, an unsubstituted or substituted tetrathio-, tetraseleno- or tetratelluro-naththalene and/or -tetracene and a substance containing active Cl, Br and/or I atoms, form radiation-sensitive layers with electrically conductive charge transfer complexes under the action of thermal energy. Irradiation under an image mask and subsequent development give antistatic or electrically conductive relief images which can be used, for example, as electrodes or conductive connections for electronic components.Type: GrantFiled: September 25, 1989Date of Patent: December 31, 1991Assignee: Ciba-Geigy CorporationInventors: Jurgen Finter, Bruno Hilti, Carl W. Mayer, Ernst Minder
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Patent number: 5034294Abstract: An electrophotographic photosensitive member has a photosensitive layer on an electroconductive support. The photosensitive layer comprises a compound represented by the general formula (1) or (2) having in the molecule thereof an electron-donating portion and an electron-accepting portion: ##STR1## where D is an electron-donating aromatic group or an electron-donating heterocyclic group; A is an electron-accepting aromatic group or an electron-accepting heterocyclic group; B is a hydrogen atom, or an aromatic or heterocyclic group which may form a ring together with A or D; m is an integer of 1, 2 or 3; and n is an integer of 0 or 1.Type: GrantFiled: February 7, 1990Date of Patent: July 23, 1991Assignee: Canon Kabushiki KaishaInventors: Shintetsu Go, Kazushi Iuchi, Hajime Miyazaki, Hideyuki Takai, Masakazu Matsumoto
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Patent number: 4835081Abstract: Disclosed is an imaging member comprised of a photoconductive layer, and a protective electron transport polymer overcoating of the formula ##STR1## wherein A is a trivalent linkage; B is a functional group such as ester, carbonate, or carbamate; and R is a bivalent linkage.Type: GrantFiled: July 3, 1986Date of Patent: May 30, 1989Assignee: Xerox CorporationInventors: Beng S. Ong, Barkev Keoshkerian, Dasarao K. Murti
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Patent number: 4820601Abstract: An imaging member comprised of a photoconductive layer, and a protective copolyurethane overcoating of the formula: ##STR1## wherein A is a trivalent group; A' is a bivalent group; R is selected from the group consisting of alkylene, substituted alkylene, arylene, and substituted arylene; x and y are number mole fractions of from about 0.05 to about 0.95 subsequent to the provision that the sum of x+y is equal to 1.0. Also disclosed are processes for the preparation of the aforementioned copolyurethanes.Type: GrantFiled: February 1, 1988Date of Patent: April 11, 1989Assignee: Xerox CorporationInventors: Beng S. Ong, Dasarao K. Murti, John R. C. Fuller
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Patent number: 4818653Abstract: An electrophotographic recording material is described that comprises an electrically conducting base layer and a photoconductive system deposited thereon, which system comprises an optional insulating intermediate layer, a layer containing a charge-generating compound, and a layer containing a charge-transporting compound mixed with binders, along with any sensitizers, acceptors and usual additives. The photoconductive system contains, as acceptor additive, one or more monomeric or polymeric compounds that have electron-attracting substitutents (halogen, cyano, nitro groups) and that are selected from the group consisting of anthracene, acridine, the anhydrides of phthalic acid, maleic acid, pyromellitic acid, benzophenonetetracarboxylic acid, and the polymers of vinyl chloride, vinylidine chloride and nitrocellulose, in a quantity of 0.2 to 10% by weight based on total coating weight.Type: GrantFiled: October 23, 1986Date of Patent: April 4, 1989Assignee: Hoechst AktiengesellschaftInventors: Wolfgang Wiedemann, Michael Drexler, Juergen Fuerderer
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Patent number: 4792208Abstract: An optical article is disclosed containing, for the transmission of electromagnetic radiation, a medium exhibiting a second order polarization susceptibility greater than 10.sup.-9 electrostatic units comprised of polar aligned noncentrosymmetric molecular dipoles. The molecular dipoles have an electron donor moiety linked through a conjugated .pi. bonding system to an electron acceptor sulfonyl moiety.Type: GrantFiled: September 28, 1987Date of Patent: December 20, 1988Assignee: Eastman Kodak CompanyInventors: Abraham Ulman, David J. Williams, Thomas L. Penner, Douglas R. Robello, Jay S. Schildkraut, Michael Scozzafava, Craig S. Willand
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Patent number: 4775605Abstract: This invention relates to a repeatedly usable photosensitive material for electrophotography, comprising an electroconductive substrate, a photosensitive layer and an intermediate layer located between said electroconductive substrate and said photosensitive layer, characterized in that said intermediate layer comprises an electroconductive polymer and an inorganic white pigment.Type: GrantFiled: December 31, 1986Date of Patent: October 4, 1988Assignee: Ricoh Co., Ltd.Inventors: Kenji Seki, Katsuichi Ohta, Kiyoshi Masuda, Hirofumi Yamanami, Satomi Mochizuki
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Patent number: 4728593Abstract: Polyimide-electron donor charge transfer complexes, supported or unsupported, as photoconductive elements characterized by photoconductivities in excess of the sum of the individual photoconductivities of the polyimide and electron donor components.Type: GrantFiled: June 9, 1986Date of Patent: March 1, 1988Assignee: E. I. Du Pont de Nemours and CompanyInventors: Steven C. Freilich, Stephen Mazur
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Patent number: 4684598Abstract: An enhanced optically sensitive medium is disclosed which uses an organic charge transfer complex as the switching material. The organic charge transfer complex includes at least one moiety in an oxidized state. An enhancement mechanism is taught which provides a secondary source of neutral molecules of said at least one constituent moiety in the neutral or altered oxidation state. For example, with CuTCNQ used as the switching material, the erasing characteristics can be improved by using a covering dispersion having a matrix polymer interspersed with neutral molecules of TCNQ.degree..Type: GrantFiled: November 23, 1984Date of Patent: August 4, 1987Assignee: The Johns Hopkins UniversityInventors: Richard S. Potember, Theodore O. Poehler
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Patent number: 4663270Abstract: A multistate organic optical storage medium is disclosed, wherein an optical beam can switch any "data storage spot" on said optical storage medium into three or more memory states. The optical storage medium may consist of a mixture of bistate switching modules, or it may consist of large delocalized amphoteric molecules. The illuminated area of said optical storage medium will undergo an electrochemical topactic redox reaction which will cause certain moieties in the illuminated area to change oxidation state. By changing the intensity of the optical "write" beam the illuminated area can be switched to a plurality of specific states each state having a unique set of oxidation species. An optical/spectroscopic means is used to identify the presence of oxidation species and to "read" the data stored.Type: GrantFiled: April 25, 1984Date of Patent: May 5, 1987Assignee: The Johns Hopkins UniversityInventors: Richard S. Potember, Theodore O. Poehler
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Patent number: 4634553Abstract: Novel 4H-tellurin compounds are disclosed. The compounds are useful as electron-accepting sensitizers for electron-donating photoconductive-compositions.Type: GrantFiled: August 12, 1985Date of Patent: January 6, 1987Assignee: Eastman Kodak CompanyInventors: Michael R. Detty, Bruce J. Murray, Michael Scozzafava
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Patent number: 4576887Abstract: Photoconductive organic polymers useful in the preparation of photodetectors and photoconductive devices comprise a transrich polyphenylacetylene. The photoconductive properties may be further enhanced by the addition of an electron-acceptor dopant, and sensitized to selected spectral regions by the addition of a selected dye.Type: GrantFiled: November 14, 1983Date of Patent: March 18, 1986Assignee: The Research Foundation of State University of New YorkInventors: Paul Ehrlich, Wayne A. Anderson, En T. Kang, Ansuya P. Bhatt
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Patent number: 4559287Abstract: An improved photoresponsive imaging member consisting essentially of a supporting substrate, a photogenerating layer, comprised of a photogenerating pigment optionally dispersed in an inactive resinous binder, an electron transporting layer comprised of derivatives of fluorenylidene methane dispersed in a resinous binder, and having incorporated therein a stabilizing amount of an aryl amine electron donating compound.Type: GrantFiled: November 13, 1984Date of Patent: December 17, 1985Assignee: Xerox CorporationInventors: T. Brian McAneney, Rafik O. Loutfy, Beng S. Ong, Zoran D. Popovic
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Patent number: 4552825Abstract: Phosphorous diketonate electron accepting compounds are disclosed for use as sensitizers in electron donating photoconductive compositions. Methine dyes having a phosphorous diketonate component and a method of making same are also disclosed.Type: GrantFiled: August 27, 1984Date of Patent: November 12, 1985Assignee: Eastman Kodak CompanyInventors: Chin H. Chen, Thomas E. Goliber, Jerome H. Perlstein, George A. Reynolds
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Patent number: 4535042Abstract: An electrophotographic photosensitive member constructed with a layer comprising an electron acceptor and a layer comprising an electron donor, both layers being supported by an electrically conductive substrate with themselves superposed upon each other to form a thin layer of charge-transfer complex at the interface between the two layers.Type: GrantFiled: February 21, 1984Date of Patent: August 13, 1985Inventors: Hiroyuki Kitayama, Toyoko Kobayashi
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Patent number: 4524118Abstract: Electrophotographic photosensitive material comprising an electroconductive substrate and a layer of a photoconductive composition composed of a dispersion of a charge generating pigment in a charge transporting medium, which is formed on the electroconductive substrate, wherein said photoconductive composition contains an N,N-di-substituted-carbamic acid salt in an amount of 20 to 200% by weight based on the charge generating pigment. This electrophotographic electrophotosensitive material has excellent ozone resistance and shows a high initial charge retention ratio and sensitivity retention ratio when the cycle of charging and light exposure is repeated many times.Type: GrantFiled: June 17, 1983Date of Patent: June 18, 1985Assignee: Mita Industrial Co., Ltd.Inventors: Kaname Nakatani, Nobuhiro Miyakawa, Teruaki Higashiguchi, Tomomi Edo
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Patent number: 4515882Abstract: An electrophotographic imaging system utilizing a member comprising at least one photoconductive layer and an overcoating layer comprising a film forming continuous phase comprising charge transport molecules and finely divided charge injection enabling particles dispersed in the continuous phase, the insulating overcoating layer being substantially transparent to activating radiation to which the photoconductive layer is sensitive and substantially electrically insulating at low electrical fields.Type: GrantFiled: January 3, 1984Date of Patent: May 7, 1985Assignee: Xerox CorporationInventors: Joseph Mammino, Donald S. Sypula, Dennis A. Abramsohn, Martin A. Abkowitz, Merlin E. Scharfe
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Patent number: 4486520Abstract: This invention is generally directed to fluorinated squaraine compositions of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4, are independently selected from alkyl groups, containing from about 1 to about 20 carbon atoms, and layered photoresponsive devices containing such compositions.Type: GrantFiled: December 5, 1983Date of Patent: December 4, 1984Assignee: Xerox CorporationInventor: John F. Yanus
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Patent number: 4480020Abstract: A photoconductive composition containing as essential components a photoconductive polymer and 1,4-bis(.beta.-cyano-.beta.-alkoxycarbonylvinyl)benzene represented by the following formula (I) ##STR1## wherein R represents a methyl group, an ethyl group, a propyl group or an isopropyl group, present in an amount of about 0.02 mol to 0.5 mol per mol of a .pi.-electron system-containing constitutional repeating unit present in the photoconductive polymer, and which forms a charge transfer complex with the photoconductive polymer through the .pi.-electron system having optical sensitivities in the ultraviolet to visible regions; and an electrophotographic light-sensitive material incorporating the aforesaid photoconductive composition in a layer on a support having a conductive surface.Type: GrantFiled: April 18, 1983Date of Patent: October 30, 1984Assignee: Fuji Photo Film Co., Ltd.Inventors: Syunichi Kondo, Hideo Sato, Satoru Honjo, Akira Umehara
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Patent number: 4476208Abstract: Novel compounds are disclosed which are composed of a barbituric acid residue or a thiobarbituric acid residue and a pyrylium salt residue, thiopyrylium salt residue, benzopyrylium salt residue, or a benzothiopyrylium salt residue. The compounds are suitable as charge generating materials for an electrophotographic light-sensitive material of the type containing a charge generating material and a charge transporting material in one layer or two separate layers. The use of the compounds improves the durability and light-sensitivity of the light-sensitive material.Type: GrantFiled: December 23, 1982Date of Patent: October 9, 1984Assignee: Fuji Photo Film Co., Ltd.Inventors: Seiji Horie, Junji Nakano, Hideo Sato
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Patent number: 4472491Abstract: An electrophotographic recording material comprised of an electrically conductive support, an optional insulating interlayer, a photoconductive system comprised of at least one layer of organic material containing a charge carrier-producing compound and a charge-transporting compound, and a radiation-cured, transparent protective layer, wherein the protective layer has been applied onto the surface of the photoconductive system with the aid of a removable auxiliary support and is comprised of an acrylated binder which is cured by irradiation with ultraviolet light. Also disclosed is a process for the production of the recording material.Type: GrantFiled: May 26, 1982Date of Patent: September 18, 1984Assignee: Hoechst AktiengesellschaftInventor: Wolfgang Wiedemann
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Patent number: 4469769Abstract: Disclosed is a photosensitive material for the electrophotography, which comprises a dispersion of a charge-generating pigment in a charge-transporting medium composed mainly of a polyvinyl carbazole resin, wherein a perylene pigment represented by the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 stand for a hydrogen atom or a substituted or unsubstituted alkyl or aryl group, is dispersed and incorporated as the charge-generating pigment in an amount of 1 to 40 parts by weight per 100 parts by weight of the polyvinyl carbazole resin and a halogeno-p-benzoquinone is further incorporated in an amount of 1 to 60 parts by weight per 100 parts by weight of the polyvinyl carbazole resin.Type: GrantFiled: August 2, 1983Date of Patent: September 4, 1984Assignee: Mita Industrial Co. Ltd.Inventors: Toru Nakazawa, Akira Fushida, Yasushi Kamezaki
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Patent number: 4450217Abstract: Novel chalcogenopentalene compounds having a tellurium atom in the 6a position, and methods of making chalcogenopentalenes having a tellurium or a selenium atom in the 6a position are disclosed. The chalcogenopentalene compounds are useful as sensitizers in electrophotographic compositions and elements containing an electron donor and as charge emitters in multilayer photoconductive elements.Type: GrantFiled: March 15, 1983Date of Patent: May 22, 1984Assignee: Eastman Kodak CompanyInventors: Michael R. Detty, Jerome H. Perlstein
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Patent number: 4447514Abstract: Disclosed is an organic photosensitive material for electrophotography comprising a charge-transporting medium composed mainly of polyvinyl carbazole and a perylene type pigment as a charge-generating pigment dispersed in said charge-transporting medium, wherein 1 to 30 parts by weight of a halo-naphthoquinone and 1 to 100 parts by weight of phenanthrene or pyrene are incorporated per 100 parts by weight of the polyvinyl carbazole.This photosensitive material is excellent in the sensitivity and the resistance to the repeated light exposure.Type: GrantFiled: March 4, 1983Date of Patent: May 8, 1984Assignee: Mita Industrial Co., Ltd.Inventors: Toru Nakazawa, Akira Fushida, Yasushi Kamezaki
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Patent number: 4444861Abstract: An electrophotographic sensitive article comprising an electroconductive substrate and a photoconductive layer formed on said substrate and composed of an electric charge generating substance and an electric charge transfer substance, which sensitive article is characterized by said electric charge transfer substance having as an active component thereof a polyester obtained from a diol component consisting preponderantly of 2,6-dimethoxy-9,10-anthracene diol and a dicarboxylic acid component consisting preponderantly of .alpha.,.omega.-dicarboxylic acid. This electrophotographic sensitive article has remarkable sensitiveness and processability.Type: GrantFiled: December 10, 1982Date of Patent: April 24, 1984Assignee: Ashai Kasei Kogyo Kabushiki KaishaInventors: Sumitaka Nogami, Yoshiharu Kitahama, Isamu Iwami
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Patent number: 4438187Abstract: Disclosed is a photosensitive composition for electrophotography, which comprises 100 parts by weight of polyvinyl carbazole, 5 to 50 parts by weight of a perylene pigment and 5 to 50 parts by weight of a halonaphthoquinone.Type: GrantFiled: April 7, 1982Date of Patent: March 20, 1984Assignee: Mita Industrial Co. Ltd.Inventors: Akira Fushida, Yoshiaki Kato
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Patent number: 4410615Abstract: An electrophotographic photosensitive element having a conductive support provided thereon with a photosensitive layer comprising a carrier-generating phase and a carrier-transporting phase. The carrier-transporting phase comprises a hydrazone compound to improve carrier-transporting ability having the formula ##STR1## wherein, X and Y each represent a hydrogen or a halogen, R.sub.1 and R.sub.2 each represent an aryl group which may have a substituent or substituents, and Ar represents an arylene group which may have a substituent or substituents.Type: GrantFiled: September 30, 1981Date of Patent: October 18, 1983Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Satoshi Goto, Akira Kinoshita, Tsuneo Wada, Yoshiaki Takei, Naoko Akashi, Hiroyuki Nomori
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Patent number: 4400455Abstract: A layered electrophotographic photoconductor whose charge generation layer comprises a bisazo pigment selected from the group consisting of the bisazo pigments represented by the following general formula (1) and whose charge transport layer contains a charge transport material selected from the group consisting of the hydrazone compounds represented by the following general formula (2): ##STR1## wherein A represents --C.sub.6 H.sub.4 --Cl(o), --C.sub.6 H.sub.4 --Cl(m), --C.sub.6 H.sub.4 --Br(o), --C.sub.6 H.sub.4 --Br(m), --C.sub.6 H.sub.4 --F(o), --C.sub.6 H.sub.4 --F(m), --C.sub.6 H.sub.4 --F(p), or --C.sub.6 H.sub.4 --I(m); ##STR2## wherein R.sup.1 represents a methyl group, an ethyl group, a 2-hydroxyethyl group or a 2-chloroethyl group; R.sup.2 represents a methyl group, an ethyl group, a benzyl group or a phenyl group; and R.sup.3 represents hydrogen, chloride, bromide, an alkyl group with one to four carbon atoms, an alkoxy group with one to four carbon atoms, a dialkylamino group, or a nitro group.Type: GrantFiled: November 30, 1981Date of Patent: August 23, 1983Assignee: Ricoh Company Ltd.Inventors: Mitsuru Hashimoto, Kiyoshi Sakai, Katsunari Ohta, Akio Kojima
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Patent number: 4394428Abstract: Photoconductive compositions having improved quantum efficiency are disclosed. The compositions comprise:(a) an electron donating photoconductor; and sensitizing amounts of(b) a first electron acceptor selected from cyanine and styryl methine dyes having a 1,3,2-dioxaborin nucleus and(c) a second electron acceptor selected from methine-free compounds having a nucleus selected from the group consisting of 1,3,2-dioxaborin; 1,3,2-oxazoborin and 1,3,2-diazoborins.Type: GrantFiled: September 24, 1981Date of Patent: July 19, 1983Assignee: Eastman Kodak CompanyInventors: James A. Van Allan, Jerome H. Perlstein, George A. Reynolds, Thomas E. Goliber
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Patent number: 4391888Abstract: Organic photoconductive elements which are stable and sensitive over a broad range of the spectrum, including the near infrared band, having a charge generating layer and a charge transport layer carried on an electroconductive support are disclosed. The invention involves the use of a first layer between the support and the charge generating layer which is capable of functioning as (i) an adhesive bonding layer on the electroconductive support to provide a receptive and retentive base layer for the charge generating layer and (ii) as a barrier layer to prevent substantially any leakage of charge from the surface of the photoconductor, characterized by the first layer comprising at least one polycarbonate having a weight average molecular weight ranging from about 25,000 to about 45,000, in combination with a charge generating layer that comprises at least one organic pigment which is sensitive to near infrared radiation.Type: GrantFiled: December 16, 1981Date of Patent: July 5, 1983Assignee: Pitney Bowes Inc.Inventors: Mike S. H. Chang, Michael F. Berman
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Patent number: 4389477Abstract: A photoconductive composition comprising a photoconductive substance and a thiobarbituric acid derivative, and an electrophotographic light-sensitive medium comprising a support having a layer of the photoconductive composition thereon.Type: GrantFiled: April 21, 1981Date of Patent: June 21, 1983Assignee: Fuji Photo Film Co., Ltd.Inventors: Syunichi Kondo, Hirotsugu Nomaguchi, Hideo Sato
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Patent number: 4387147Abstract: An electrophotographic element which comprises a conductive substrate and a photosensitive layer, superposed thereon, consisting of a charge generation layer and a charge transport layer, said charge transport layer containing as an available ingredient a hydrazone compound having the following general formula (I): ##STR1## (where R is a hydrogen atom, an alkyl group, of from one to six carbon atoms, an alkoxyl group of from one to six carbon atoms, a substituted or non-substituted dialkylamino group, halogen, a nitro group or a hydroxyl group. n is an integer of 1-5. In case where n is 2 or more, R may be the same or different.).Type: GrantFiled: December 3, 1980Date of Patent: June 7, 1983Assignee: Ricoh Co., Ltd.Inventor: Kiyoshi Sakai
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Patent number: 4384034Abstract: A photoconductive layer sensitized by a compound of the general formula: ##STR1## in which: R.sup.1 and R.sup.2 independently represent a hydrogen atom, an alkyl or substituted alkyl group, an aryl or substituted aryl group, an aralkyl or substituted aralkyl group, a cycloaliphatic or substituted cycloaliphatic group or a heterocyclic or substituted heterocyclic group providing R.sup.1 and R.sup.2 do not both represent cyclic groups of aromatic nature, or R.sup.1 and R.sup.2 together may represent the necessary atoms to complete a non-aromatic heterocyclic ring,R.sup.3, R.sup.4, R.sup.5 and R.sup.6 independently represent a hydrogen atom or any substituent providing the sum of their .sigma..sub.p constants has a value of less than +0.5, or R.sup.3 and R.sup.4 and/or R.sup.5 and R.sup.6 may represent the necessary atoms to complete an alicyclic or aromatic ring, R.sup.3 and R.sup.2 and/or R.sup.1 and R.sup.6 may represent the necessary atoms to complete a non-aromatic heterocyclic ring,R.sup.7 and R.sup.Type: GrantFiled: February 27, 1981Date of Patent: May 17, 1983Assignee: Minnesota Mining and Manufacturing CompanyInventors: Alan N. Ferguson, Kenneth Reynolds
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Patent number: 4379823Abstract: A photoconductive layer embodies the combination of an organic photoconductive donor compound, such as poly(N-vinyl) carbazole and derivatives thereof, and an acceptor-sensitizer compound having the general formula ##STR1## in which M is a metal such as boron, aluminum, gallium, indium and thallium, X and Y are oxygen sulphur, nitrogen, phosphorus, antimony or selenium, Z.sub.1 and Z.sub.2 are halogen, or substituted or unsubstituted alkyl, alkaryl or heterocyclic groups, R.sub.1 and R.sub.2 are substituted or unsubstituted aryl, alkaryl, alkyl or alicyclic groups, and n is 2 or 3.Type: GrantFiled: May 27, 1980Date of Patent: April 12, 1983Assignee: A. B. Dick CompanyInventor: James M. Halm
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Patent number: 4361637Abstract: Organic electron donor compounds for use in electrophotographic constructions tend to suffer from problems of molecular weight non-uniformity and oxidation. Bis-benzocarbazole derivatives have been found to resist the oxidation and oligomerization which are a source of these problems.Type: GrantFiled: February 23, 1981Date of Patent: November 30, 1982Assignee: Minnesota Mining and Manufacturing CompanyInventors: John J. Stofko, Jr., Kenneth G. Kneipp, Terry J. Sonnonstine