Binder For Radiation-conductive Composition Patents (Class 430/96)
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Patent number: 6573017Abstract: Disclosed is a single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer made of a binder resin containing at least an electric charge generating material and an electric charge transferring material, which is formed on the conductive substrate, wherein an oxygen transmission rate of the binder resin is not more than 35 cc·mm/m2·day·atom, wherein it is preferred that a mobility at an electric field strength of 5×105 V/cm of the hole transferring material is not less than 5×10−6 cm2/V/sec and a solid content of the electric charge transferring material is not less than 30% by weight and not more than 50% by weight based on the whole solid content; said electrophotosensitive material has good ozone resistance and does not cause defects such as image black belt due to lowering of the charge capability, an ozone of which is 5.0 ppm at most, and is also superior in sensitivity and wear resistance.Type: GrantFiled: December 12, 2001Date of Patent: June 3, 2003Assignee: Kyocera Mita CorporationInventors: Jun Azuma, Yukimasa Watanabe, Hisakazu Honma, Ayako Yashima, Maki Uchida, Eiichi Miyamoto
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Patent number: 6569586Abstract: A photoreceptor for forming an electrostatic latent image is disclosed. The photoreceptor comprises a photosensitive layer and a resin layer wherein a resin of the resin layer comprises an organic polymer component, siloxane component and charge transportable component.Type: GrantFiled: October 15, 2001Date of Patent: May 27, 2003Assignee: Konica CorporationInventors: Akihiko Itami, Satoshi Uchino, Fumitaka Mochizuki, Kazuhisa Shida, Takeo Ohshiba
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Publication number: 20030087173Abstract: Electrophotographic photoreceptors having improved mechanical properties, electrical properties with excellent response characteristics are prepared by forming a photosensitive layer on an electroconductive substrate. The photosensitive layer contains a binder resin, which may be a polyarylate or a copolymer of polyarylate. The binder resin may be mixed with other resins up to 50 wt % with other resins to impove surface slip properties or fire retardant properties.Type: ApplicationFiled: August 21, 2002Publication date: May 8, 2003Applicant: Mitsubishi Chemical CorporationInventors: Yuuta Kumano, Satoshi Kato, Chiyoko Sato, Akiteru Fujii, Mamoru Nozomi
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Publication number: 20030082468Abstract: A charge transport composition containing aromatic amines with crosslinkable silanes as represented by the formula 1Type: ApplicationFiled: September 10, 2001Publication date: May 1, 2003Applicant: Xerox CorporationInventors: Nan-Xing Hu, Yu Qi, Ping Liu
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Patent number: 6548216Abstract: An electrophotographic photoconductor has an electroconductive support and a photoconductive layer which is formed thereon and contains at least one resin of a polyurethane resin, a polyester resin, or a polycarbonate resin, each resin having at least a structural unit of formula (1): wherein R1, R2, R3, a, b, and n are the same as those specified in the specification. An electrophotographic image forming apparatus and method, and a process cartridge employ the above photoconductor.Type: GrantFiled: March 23, 2001Date of Patent: April 15, 2003Assignee: Ricoh Company, Ltd.Inventors: Shinichi Kawamura, Kazukiyo Nagai, Tomoyuki Shimada, Chiaki Tanaka, Michihiko Namba
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Publication number: 20030059696Abstract: The object of the present invention is to provide an endless flexible single-layer positively charged organic photosensitive body and an image forming device using the same, wherein: in an image forming device that is small, high speed and capable of color output, even when tension and compression forces, which are generated by having the photosensitive body stretched between a plurality of cylindrical rollers, are repeatedly applied to the belt photosensitive body, no problems arise in the electrophotography properties of the photosensitive layer.Type: ApplicationFiled: February 13, 2002Publication date: March 27, 2003Inventors: Osamu Nabeta, Shinichi Omokawa, Hirotaka Kobayashi, Toshio Tsubota
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Publication number: 20030059694Abstract: An electrophotographic photoconductor a substrate and a photosensitive layer on the substrate. The photosensitive layer contains charge generation substance, charge transport substance and a binder resin. The binder resin has a dispersion d1=Mz/Mw of at least 1.6, and/or a polydispersity d2=Mw/Mn of at least 2.0, each of d1 and d2 being an indicator of a range of molecular weight distribution converted to polystyrene standard, wherein Mz, Mw and Mn are a z-average molecular weight, a weight-average molecular weight, and a number-average molecular weight of the binder resin, respectively. The resulting electrophotographic photoconductor minimizes film abrasion and filming, allowing the photoconductor to possess stable characteristics in repeated use over long periods.Type: ApplicationFiled: August 15, 2002Publication date: March 27, 2003Applicant: Fuji Electric Imaging Device Co., Ltd.Inventors: Yoshimasa Tomiuchi, Hiroaki Yokouchi
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Publication number: 20030054274Abstract: A high-sensitivity and long-life electrophotographic photoreceptor comprising an electroconductive substrate and at least a photosensitive layer on the electroconductive substrate is provided, wherein the photosensitive layer contains a polyarylate resin not having a nitrogen atom in its repeating unit, and the Hall mobility at an electric field strength of 3×105 (V/cm) and at a temperature of 21° C. of the photosensitive layer is 3×10−6 (cm2/Vs) or more.Type: ApplicationFiled: September 19, 2002Publication date: March 20, 2003Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Teruyuki Mitsumori, Akiteru Fujii, Mamoru Nozomi, Satoshi Kato, Yuuta Kumano
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Patent number: 6489070Abstract: A photoconductor comprises a substrate and a charge generation layer comprising cyclic carbonate polymer and a charge generation molecule. The photoconductor exhibits improved electrical characteristics.Type: GrantFiled: March 9, 2001Date of Patent: December 3, 2002Assignee: Lexmark International, Inc.Inventor: Kasturi R. Srinivasan
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Publication number: 20020159804Abstract: Disclosed are image forming apparatus [1] which comprises removing a toner remained on the surface of the rotatable image carrier by cleaning means after going through developing means and transferring means; said cleaning means has an elastic blade and is contacted with the surface of the image carrier at a contact pressure within 8 to 20 g/cm, and a press-contact angle of the elastic blade of 12 to 30°; and said image carrier is an organic photosensitive material having a photosensitive layer made of a binder resin containing an electric charge generating material and an electric charge transferring material; and image forming apparatus [2], comprising a single-layer type photosensitive layer made of a binder resin containing an electric charge generating material, an electron transferring material and a hole transferring material, and the solid content of the binder resin is within 50 to 70 wt % of the whole solid content in the photosensitive layer and, a pair of paper transportingType: ApplicationFiled: February 14, 2002Publication date: October 31, 2002Inventors: Jun Azuma, Ayako Yashima, Yukimasa Watanabe, Keisuke Oba, Masashi Fujishima, Takashi Nagashima
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Patent number: 6472055Abstract: A direct drawing type lithographic printing plate precursor comprising a water-resistant support having provided thereon an image-receiving layer, the image-receiving layer containing: at least one metal oxide hydrate having an average particle size of from 0.01 to 5 pm and comprising a metal atom selected from Mg, Al, Zn, Ge, Ti, Co, Zr, Sn, Fe, Cu, Ni, Pb, Pd, Cd, Mo, Cr, Ga, Mn, V, Ce and La; and a binder resin containing a complex comprising: a resin containing a siloxane bond in which a silicon atom is connected with an oxygen atom; and an organic polymer containing a group capable of forming a hydrogen bond with the resin containing a siloxane bond.Type: GrantFiled: November 9, 1999Date of Patent: October 29, 2002Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroshi Tashiro, Eiichi Kato
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Publication number: 20020146630Abstract: Compositions and methods are disclosed for use in the analysis and quantitation of conjugated and unconjugated bilirubin in patient or other samples.Type: ApplicationFiled: February 13, 2001Publication date: October 10, 2002Inventors: Alex Michael Seizew, Sean Michael Teel
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Patent number: 6451493Abstract: An electrophotographic photoconductor which is a positive charging, single layer type organic photoconductor including a conductive substrate; and a photosensitive layer which is provided on the conductive substrate, which is a positive charging, single layer type organic photoconductor, and which is composed of at least one charge generation substance that contains a phthalocyanine pigment; a positive hole transport substance; an electron transport substance; and a binder that contains a polycarbonate resin with a polydialkylsilozane constructed of a repeated unit represented by formula (1). Toner consumption during repeated electrophotographic use is reduced and print defects including dirty background suppressed.Type: GrantFiled: November 17, 2000Date of Patent: September 17, 2002Assignee: Fuji Electric Imaging Device Co., Ltd.Inventors: Shinichi Omokawa, Masaru Takeuchi, Seizo Kitagawa
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Publication number: 20020119385Abstract: Disclosed is a single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer made of a binder resin containing at least an electric charge generating material and an electric charge transferring material, which is formed on the conductive substrate, wherein an oxygen transmission rate of the binder resin is not more than 35 cc·mm/m2·day·atom, wherein it is preferred that a mobility at an electric field strength of 5×105 V/cm of the hole transferring material is not less than 5×10−6 cm2/V/sec and a solid content of the electric charge transferring material is not less than 30% by weight and not more than 50% by weight based on the whole solid content; said electrophotosensitive material has good ozone resistance and does not cause defects such as image black belt due to lowering of the charge capability, an ozone of which is 5.0 ppm at most, and is also superior in sensitivity and wear resistance.Type: ApplicationFiled: December 12, 2001Publication date: August 29, 2002Inventors: Jun Azuma, Yukimasa Watanabe, Hisakazu Honma, Ayako Yashima, Maki Uchida, Eiichi Miyamoto
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Patent number: 6440623Abstract: A direct drawing type lithographic printing plate precursor comprising a water-resistant support having provided thereon an image-receiving layer comprising inorganic particles and a binder resin, wherein the inorganic particles comprise at least one kind of particles selected from: (i) metal oxide particles having an average particle size of from 0.01 to 5 &mgr;m and comprising a metal atom selected from Mg, Ba, Ge, Sn, Zn, Pb, La, Zr, V, Cr, Mo, W, Mn, Co, Ni and Cu; and (ii) double oxide particles having an average particle size of from 0.01 to 5 &mgr;m and comprising at least one metal atom selected from Mg, Al, Si, Ti, Zr, Cr, V, Mo, Sn, W and Nb, and wherein the binder resin comprises a complex comprising: a resin containing a bond in which a metal atom is connected with an oxygen atom; and an organic polymer containing a group capable of forming a hydrogen bond with the resin and at least one polar functional group selected from a carboxy group, a sulfo group and a phosphono group.Type: GrantFiled: January 29, 2001Date of Patent: August 27, 2002Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroshi Tashiro, Eiichi Kato
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Publication number: 20020098430Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a structural unit of formula (2) and a structural unit with charge transporting properties, each of the structural units being contained in an amount of 5 wt. % or more of the total weight of the polycarbonate resin. There is disclosed an aromatic polycarbonate resin having a structural unit of formula (1) and the structural unit of formula (2), with the relationship between the composition ratios being 0<k/(k+j)<1 when the composition ratio of the structural unit (1) is k and that of the structural unit (2) is j, or an aromatic polycarbonate resin having a repeat unit of formula (3). The formulas (1) to (3) are specified in the specification.Type: ApplicationFiled: January 22, 2002Publication date: July 25, 2002Applicant: RICOH COMPANY, LTD.Inventors: Shinichi Kawamura, Masaomi Sasaki, Kazukiyo Nagai, Kohkoku Ri, Susumu Suzuka, Katsuhiro Morooka
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Patent number: 6410195Abstract: An electrophotographic photosensitive member comprising a support and a photosensitive layer provided thereon. The photosensitive layer fulfilling at least one of the following conditions (A) and (B): (A) containing a polymerization product of a monomer having a reactive group represented by the following Formula (1): —O—(—CH2—)n—CH═CH—R0 (1); and (B) containing a copolymerization product of a monomer having a reactive group represented by the following Formula (2): —O—CH═CH2 (2) with a charge-transporting material having a reactive group capable of reacting with the monomer.Type: GrantFiled: August 7, 2000Date of Patent: June 25, 2002Assignee: Canon Kabushiki KaishaInventors: Takakazu Tanaka, Yuka Nakajima
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Patent number: 6399278Abstract: Clean running printing plates for flexographic printing may be prepared by the co-photopolymerization of a mixture comprising a liquid, acrylate or methacrylate-terminated polyurethane oligomer, an ethylenically unsaturated compound, and a photopolymerization initiator. The liquid oligomer is preferably the acrylated or methacrylated reaction product of a diisocyanate, a liquid hydrophobic polyalkylene oxide, and a diol that is at least one of polypropylene oxide and a copolymer of ethylene oxide and propylene oxide, where reaction with a hydroxy-containing acrylate or methacrylate compound incorporates terminal acrylate or methacrylate groups into the oligomer. The photopolymerizable blend may be used to form printing plates for flexographic printing, where the plates have a reduced tendency to pick up paper fibers, dust and dried ink during the printing process. Methodology for preparing the printing plates, and printing with the printing plates of the invention is also provided.Type: GrantFiled: June 10, 1996Date of Patent: June 4, 2002Inventor: Douglas R. Leach
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Patent number: 6399262Abstract: An electrophotographic photoreceptor is disclosed. The photoreceptor has a photosensitive layer provided on an electrically conductive support which has a sealed alumite film, a surface layer of said electrophotographic photoreceptor comprises a hardenable siloxane resin having charge transportability or a hardenable siloxane resin comprising a partial structure having charge transportability.Type: GrantFiled: March 24, 2000Date of Patent: June 4, 2002Assignee: Konica CorporationInventors: Takeo Oshiba, Akihiko Itami, Tomoo Sakimura, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
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Patent number: 6395441Abstract: The present invention provides an electrophotographic photosensitive member having a surface layer containing diorganopolysiloxane having, as substituents, a perfluoro group, and a group having a substituted or unsubstituted polystyrene chain, a closed terminal and a degree of polymerization of 3 or more. The present invention also provides a process cartridge having the electrophotographic photosensitive member, and an electrophotographic apparatus.Type: GrantFiled: December 27, 2000Date of Patent: May 28, 2002Assignee: Canon Kabushiki KaishaInventors: Hirotoshi Uesugi, Hideki Anayama
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Patent number: 6376144Abstract: A photoconductive composition useful for the preparation of printing plates is disclosed. The composition comprising an organic photoconductor, a charge carrier generating material, and a binder comprising a mixture of at least two copolymers. Copolymer (a) comprises an aromatic vinyl monomer, such as styrene or a substituted styrene, and maleic acid anhydride ring opened with a first aliphatic alcohol.Type: GrantFiled: August 3, 2000Date of Patent: April 23, 2002Assignee: Kodak Polychrome Graphics, LLCInventor: Harald Baumann
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Publication number: 20020045119Abstract: A single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer made of a binder resin containing at least an electric charge generating material and a hole transferring material and an electron transferring material as an electric charge transferring material, which is formed on the conductive substrate, characterized in that the binder resin contains a polycarbonate resin having a repeating structural unit represented by the general formula [1] and the solid content of the hole transferring material and the electron transferring material is not less than 30% by weight and not more than 50% by weight relative to the entire solid content, exhibits good wear resistance with respect to the photosensitive layer and is also superior in durability.Type: ApplicationFiled: August 31, 2001Publication date: April 18, 2002Inventors: Jun Azuma, Yukimasa Watanabe, Hisakazu Honma, Ayako Yashima, Maki Uchida, Kyoichi Nakamura, Eiichi Miyamoto
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Patent number: 6372397Abstract: An electrophotographic photosensitive member is constituted by a support and a photosensitive layer disposed on the support. The photosensitive layer comprises a charge-transporting material and a resin obtained by radiation curing of a compound having a functional group represented by the following formula (1): wherein Ar denotes a substituted or unsubstituted arylene group and R1 denotes a hydrogen atom or methyl group.Type: GrantFiled: December 30, 1999Date of Patent: April 16, 2002Assignee: Canon Kabushiki KaishaInventors: Akio Maruyama, Toshihiro Kikuchi, Shoji Amamiya, Michiyo Sekiya, Hiroki Uematsu
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Publication number: 20020025483Abstract: An electrophotographic photoconductor has an electroconductive support and a photoconductive layer which is formed thereon and contains at least one resin of a polyurethane resin, a polyester resin, or a polycarbonate resin, each resin having at least a structural unit of formula (1): 1Type: ApplicationFiled: March 23, 2001Publication date: February 28, 2002Applicant: Ricoh Company, Ltd.Inventors: Shinichi Kawamura, Kazukiyo Nagai, Tomoyuki Shimada, Chiaki Tanaka, Michihiko Namba
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Patent number: 6350553Abstract: A photoconductor comprises a substrate and at least one layer. The at least one layer is selected from the group consisting of charge transfer layers comprising a charge transfer molecule, polycarbonate and a first polyaryl ether selected from the group consisting of polyaryletherketones, poly(aryl-perfluoroaryl ether)s, polyaryletherketone-hydrazones, polyaryletherketone-azines and mixtures and copolymers thereof; charge generating layers comprising a pigment, a polyvinylbutyral and a second polyaryl ether selected from the group consisting of polyaryletherketones, polyarylethersulfones and mixtures and copolymers thereof; and mixtures thereof.Type: GrantFiled: January 23, 2001Date of Patent: February 26, 2002Assignee: Lexmark International, Inc.Inventor: Kasturi R. Srinivasan
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Publication number: 20020018953Abstract: An electrophotographic photosensitive member has a support and a photosensitive layer formed thereon. The electrophotographic photosensitive member has a surface layer containing a charge-transporting material and a resin obtained by exposing to radiations a compound having an acryloyloxy group or methacryloyloxy group to cure.Type: ApplicationFiled: January 6, 1999Publication date: February 14, 2002Inventors: AKIO MARUYAMA, SHOJI AMAMIYA, MICHIYO SEKIYA, HIROKI UEMATSU
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Publication number: 20020018948Abstract: A function separated laminated electrophotography photosensitive body is equipped with at least a charge generating layer and a charge transport layer on top of a conductive substrate. A contact angle &thgr; of pure water on the charge transport layer satisfies the equation &thgr;>=94°. The resulting organic electrophotography photosensitive body prevents contamination of the photosensitive body surface resulting from component migration from the developing roller and achieves a stable image quality.Type: ApplicationFiled: May 24, 2001Publication date: February 14, 2002Inventors: Motohiro Takeshima, Haruo Kawakami
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Publication number: 20010053490Abstract: An electrophotographic photoconductor a substrate and a photosensitive layer on the substrate. The photosensitive layer contains charge generation substance, charge transport substance and a binder resin. The binder resin has a dispersion d1=Mz/Mw of at least 1.6, or a polydispersity d2=Mw/Mn of at least 2.0, each of d1 and d2 being an indicator of a range of molecular weight distribution converted to polystyrene standard, wherein Mz, Mw and Mn are a z-average molecular weight, a weight-average molecular weight, and a number-average molecular weight of the binder resin, respectively. The resulting electrophotographic photoconductor minimizes film abrasion and filming, allowing the photoconductor to possess stable characteristics in repeated use over long periods.Type: ApplicationFiled: March 15, 2001Publication date: December 20, 2001Inventors: Yoshimasa Tomiuchi, Hiroaki Yokouchi
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Patent number: 6330054Abstract: An image-forming apparatus forms an image by applying a control electric field having a polarity corresponding to recording information, to a recording medium having microcapsules including chargeable particles dispersed in a dispersion medium. The image-forming apparatus includes an alternating electric field-applying unit for applying an alternating electric field to the microcapsules. The alternating electric field is applied to the microcapsules of the recording medium before the image formed on the recording medium is rewritten. Accordingly, the chargeable particles are separated from the wall surfaces of the microcapsules and from the other chargeable particles, making it possible for the chargeable particles to perform free electrophoresis. The recording medium is initialized to improve the response performance with respect to the control electric field for forming a new image. The recording density is increased, and the blur is reduced.Type: GrantFiled: September 29, 1999Date of Patent: December 11, 2001Assignee: Brother Kogyo Kabushiki KaishaInventor: Jun Ikami
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Publication number: 20010049067Abstract: A high-sensitivity and long-life electrophotographic photoreceptor comprising an electroconductive substrate and at least a photosensitive layer on the electroconductive substrate is provided, wherein the photosensitive layer contains a polyarylate resin not having a nitrogen atom in its repeating unit, and the Hall mobility at an electric field strength of 3×105 (V/cm) and at a temperature of 21° C. of the photosensitive layer is 3×10−6 (cm2/Vs) or more.Type: ApplicationFiled: December 19, 2000Publication date: December 6, 2001Inventors: Teruyuki Mitsumori, Akiteru Fujii, Mamoru Nozomi, Satoshi Kato, Yuuta Kumano
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Patent number: 6309784Abstract: Charge generation layers comprise a binder including an unsaturated aliphatic hydrocarbon and charge generation compound, wherein the unsaturated, aliphatic hydrocarbon comprises at least 10 carbon atoms. Charge transport layers comprise one or more unsaturated aliphatic hydrocarbons and a charge transport compound, wherein the unsaturated hydrocarbon comprises at least 10 carbon atoms. Dual layer photoconductors comprise a substrate, a charge transport layer and a charge generation layer, wherein at least one of the charge generation layer or charge transport layer comprise one or more unsaturated aliphatic hydrocarbons having at least 10 carbon atoms.Type: GrantFiled: February 14, 2000Date of Patent: October 30, 2001Assignee: Lexmark International, Inc.Inventors: David Glenn Black, Dat Quoc Nguyen, Kasturi R. Srinivasan
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Patent number: 6306594Abstract: An efficient method for the microfabrication of electronic devices which have been adapted for the analyses of biologically significant analyte species is described. The techniques of the present invention allow for close control over the dimensional features of the various components and layers established on a suitable substrate. Such control extends to those parts of the devices which incorporate the biological components which enable these devices to function as biological sensors. The materials and methods disclosed herein thus provide an effective means for the mass production of uniform wholly microfabricated biosensors. Various embodiments of the devices themselves are described herein which are especially suited for real time analyses of biological samples in a clinical setting. In particular, the present invention describes assays which can be performed using certain ligand/ligand receptor-based biosensor embodiments.Type: GrantFiled: November 17, 1998Date of Patent: October 23, 2001Assignee: i-STAT CorporationInventors: Stephen N. Cozzette, Graham Davis, Imants R. Lauks, Randall M. Mier, Sylvia Piznik, Nicolaas Smit, Paul Van der Werf, Henry J. Wieck
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Patent number: 6300025Abstract: A photoconductor having a charge generation layer of pigment and a binder resin of a thorough mixture of polyvinylbutyral, a polysiloxane, and, preferably, a phenolic resin. An optimum formulation was Type IV oxotitanium phthalocyanine in a binder of, by weight 50 parts polyvinylbutyral, 45 parts poly(methyl-phenyl)siloxane, and 5 parts polyhydroxystyrene. This photoconductor provides excellent electrical properties and consistent, economical coating results.Type: GrantFiled: June 1, 2000Date of Patent: October 9, 2001Assignee: Lexmark International, Inc.Inventors: Gregory Walter Haggquist, Scott Thomas Mosier, Kasturi Rangan Srinivasan
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Patent number: 6294301Abstract: In a photoconductive element comprising a conductive support, e.g., an electrically conductive film, drum or belt on which a negatively chargeable photoconductive layer is formed, an electrical barrier layer is formed between the support and the photoconductive layer. The barrier layer provides a high energy barrier to the injection of positive charges but transports electrons under an applied electric field. The barrier layer of the invention transports charge by electronic rather than ionic mechanisms and, therefore, is not substantially affected by humidity changes. The barrier layer comprises a polyester-co-imide, polyesterionomer-co-imide or polyamide-co-imide having covalently bonded as repeating units in the polymer chain, aromatic tetracarboxylbisimide groups of the formula: wherein Ar1 and Ar2 represent, respectively, tetravalent and trivalent aromatic groups of 6 to 20 carbon atoms.Type: GrantFiled: May 19, 2000Date of Patent: September 25, 2001Assignee: Nexpress Solutions LLCInventors: Louis J. Sorriero, Marie B. O'Regan, Michel F. Molaire
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Publication number: 20010023047Abstract: A photoconductor comprises a substrate and at least one layer. The at least one layer is selected from the group consisting of charge transfer layers comprising a charge transfer molecule, polycarbonate and a first polyaryl ether selected from the group consisting of polyaryletherketones, poly(aryl-perfluoroaryl ether)s, polyaryletherketone-hydrazones, polyaryletherketone-azines and mixtures and copolymers thereof; charge generating layers comprising a pigment, a polyvinylbutyral and a second polyaryl ether selected from the group consisting of polyaryletherketones, polyarylethersulfones and mixtures and copolymers thereof; and mixtures thereof.Type: ApplicationFiled: January 23, 2001Publication date: September 20, 2001Inventor: Kasturi R. Srinivasan
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Patent number: 6291125Abstract: A terpolymer represented by formula is useful in particular in electrophotographic imaging members.Type: GrantFiled: November 1, 1999Date of Patent: September 18, 2001Assignee: Xerox CorporationInventors: Dale S. Renfer, John F. Yanus, William W. Limburg, Damodar M. Pai, Paul J. DeFeo, Richard L. Schank
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Publication number: 20010012594Abstract: An image bearing material including a matrix resin and, within the matrix resin, a core/shell graft copolymer including a core including one or more polymers and a shell including a graft polymer which has a linear chain connected with the core and which is formed from one or more monomers. The image bearing material is preferably used for a surface layer of an electrophotographic photoreceptor, an intermediate transfer medium, and the like image bearing members to improve the abrasion resistance thereof.Type: ApplicationFiled: December 22, 2000Publication date: August 9, 2001Applicant: Ricoh Company LimitedInventors: Kohkoku Ri, Masaomi Sasaki, Kazukiyo Nagai, Shinichi Kawamura
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Patent number: 6265124Abstract: A photoconductor comprises a substrate and a charge generation layer comprising a charge generation molecule and a binder selected from the group consisting of butylated reaction products of p-cresol and dicyclopentadine. The photoconductor demonstrates improved electrical characteristics in fatigue properties.Type: GrantFiled: May 31, 2000Date of Patent: July 24, 2001Assignee: Lexmark International, Inc.Inventors: Weimei Luo, Mark Thomas Bellino
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Patent number: 6258499Abstract: An electrophotographic photoreceptor is disclosed. The photoreceptor comprises an electrically conductive support having thereon a photosensitive layer in which the glass transition temperature of the surface layer of said photosensitive layer is at least 105° C. and the contact angle of said surface layer with respect to deionized water is at least 90°. An image forming method, an apparatus and a unit employing the photoreceptor are also disclosed.Type: GrantFiled: January 7, 2000Date of Patent: July 10, 2001Assignee: Konica CorporationInventor: Akihiko Itami
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Patent number: 6258498Abstract: An electrophotographic photosensitive member comprises a support and a photosensitive layer provided on the support.Type: GrantFiled: December 23, 1999Date of Patent: July 10, 2001Assignee: Canon Kabushiki KaishaInventors: Masataka Kawahara, Takeshi Ikeda, Tetsuro Fukui, Takanori Matsuda
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Patent number: 6245473Abstract: An electrophotographic photosensitive member comprises a conductive support and a photosensitive layer which comprises a charge generation layer and a charge transport layer, characterized in that the charge generation layer contains a polycarbonate resin, and the electrophotographic photosensitive member is electrostatically charged by applying a direct current voltage to a charging member in contact with the surface of said electrophotographic photosensitive member.Type: GrantFiled: October 21, 1996Date of Patent: June 12, 2001Assignee: Canon Kabushiki KaishaInventors: Hideki Anayama, Toshiyuki Yoshihara, Itaru Yamazaki, Hideyuki Ainoya, Hidetoshi Hirano, Mayumi Kimura
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Patent number: 6238833Abstract: A composition including: a polymeric compound including a polyvinyl butyral moiety, an optional polyvinyl alcohol moiety, an optional polyvinyl acetate moiety, and a modified polyvinyl moiety of the formula where R is an organic substituent, wherein the polyvinyl alcohol moiety has a hydroxyl content that ranges from 0% to about 5% by weight when —OR is an acetate.Type: GrantFiled: September 1, 1999Date of Patent: May 29, 2001Assignee: Xerox CorporationInventors: John S. Chambers, Huoy-Jen Yuh, H. Bruce Goodbrand
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Patent number: 6232025Abstract: A photoconductor comprises a substrate and at least one layer. The at least one layer is selected from the group consisting of charge transfer layers comprising a charge transfer molecule, polycarbonate and a first polyaryl ether selected from the group consisting of polyaryletherketones, poly(aryl-perfluoroaryl ether)s, polyaryletherketone-hydrazones, polyaryletherketone-azines and mixtures and copolymers thereof; charge generating layers comprising a pigment, a polyvinylbutyral and a second polyaryl ether selected from the group consisting of polyaryletherketones, polyarylethersulfones and mixtures and copolymers thereof, and mixtures thereof.Type: GrantFiled: January 10, 2000Date of Patent: May 15, 2001Assignee: Lexmark International, Inc.Inventor: Kasturi R. Srinivasan
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Patent number: 6214502Abstract: Charge generation layers comprise a charge generation compound and a binder which comprises polyvinylbutyral and phenolic resol. Dual layer photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer, in which the charge generation layer comprises a charge generation compound and a binder which comprises polyvinylbutyral and phenolic resol. Dual layer photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer, in which the charge generation layer comprises a charge generation compound and a binder which comprises polyvinylbutyral and a resin selected from the group consisting of phenol novolac and polyhydroxystyrene.Type: GrantFiled: March 28, 2000Date of Patent: April 10, 2001Assignee: Lexmark International, Inc.Inventors: Kasturei Rangan Srinivasan, Ronald Harold Levin, Garry D. Hinch, Gregory Walter Haggquist
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Patent number: 6214505Abstract: A photoconductive imaging member containing a photogenerating layer and a charge transport layer, and wherein the charge transport layer contains a poly(imide-carbonate) resin binder of (I) or (II) wherein A, B and E are divalent linkages; D is a trivalent linkage in (I) and a tetravalent linkage in (II); and x and y represent mole fractions wherein the sum of x+y is equal to 1.Type: GrantFiled: July 18, 2000Date of Patent: April 10, 2001Assignee: Xerox CorporationInventors: Beng S. Ong, Yu Qi, Cheng-Kuo Hsiao
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Patent number: 6200715Abstract: An electrophotographic imaging member including a support member, a charge generating layer and a charge transport layer, the charge transport layer including a cross linked matrix derived from a cross linkable aromatic polymer with substituent groups containing unsaturated carbon to carbon double bond, the substituent groups being free of any urethane linkage and attached to phenylene.Type: GrantFiled: July 29, 1999Date of Patent: March 13, 2001Assignee: Xerox CorporationInventors: Timothy J. Fuller, John F. Yanus, Damodar M. Pai, Markus R. Silvestri, Ram S. Narang, William W. Limburg, Dale S. Renfer
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Patent number: 6194111Abstract: A crosslinkable charge transport layer material for a photoconductor includes at least one poly(arylene ether alcohol), at least one polyisocyanate crosslinking agent and at least one charge transport material dispersed in a solvent. The crosslinkable charge transport layer material is crosslinked following application of the coating solution to the photoconductor. The photoconductor including such crosslinked charge transport layer exhibits excellent wear resistance so as to have long life, thereby reducing the cost of electrophotographic printing machines employing such photoconductors therein.Type: GrantFiled: January 19, 2000Date of Patent: February 27, 2001Assignee: Xerox CorporationInventors: Timothy J. Fuller, Markus R. Silvestri, John F. Yanus, Damodar M. Pai, Paul J. De Feo, Dale S. Renfer, Anthony T. Ward, William W. Limburg, Harold F. Hammond, Robert W. Nolley
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Patent number: 6187492Abstract: A method of producing an aromatic polycarbonate resin includes the step of carrying out solution polymerization of a diphenol compound having a triarylamine structure with a diol compound of formula (I): wherein R1 and R2 are each independently a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a halogen atom; a and b are each independently an integer of 0 to 4; and Y is —COO— or in which Z is a substituted or unsubstituted bivalent aliphatic group or a substituted or unsubstituted arylene group.Type: GrantFiled: July 7, 1999Date of Patent: February 13, 2001Assignee: Ricoh Company, Ltd.Inventors: Kohkoku Ri, Masaomi Sasaki, Kazukiyo Nagai, Shinichi Kawamura, Susumu Suzuka, Katsuhiro Morooka
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Patent number: 6187494Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer which is formed thereon and contains an aromatic polycarbonate resin including at least a structural unit of formula (1): wherein a, b, c and d are each independently an integer of 0 to 4; n is an integer of 0 or 1; and R1, R2, R3 and R4 are each independently a halogen atom, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted alkoxyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group, and R1, R2, R3 and R4 may each be the same or different when a, b, c and d are each an integer of 2, 3 or 4. Further, there are provided aromatic polycarbonate resins each including the structural unit of formula (1) and a structural unit with charge transporting properties.Type: GrantFiled: July 23, 1999Date of Patent: February 13, 2001Assignee: Ricoh Company, Ltd.Inventors: Shinichi Kawamura, Masaomi Sasaki, Kazukiyo Nagai, Chiaki Tanaka, Kohkoku Ri, Susumu Suzuka, Katsuhiro Morooka
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Patent number: 6187493Abstract: The present invention provides an electrophotosensitive material comprising a conductive substrate and a photosensitive layer provided on the conductive substrate, the photosensitive layer comprising a specific hole transferring material and/or electron transferring material and a binding resin of a polyester resin which is a substantially linear polymer obtained by using a specific dihydroxy compound represented by the general formula (1): wherein R1 is an alkylene group having 2 to 4 carbon atoms; and R2, R3, R4 and R5 are the same or different and indicate a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group or an aralkyl group or the like. This photosensitive material is improved in sensitivity, and is also superior in adhesion to conductive substrate as well as mechanical strength such as wear resistance, etc.Type: GrantFiled: February 10, 1998Date of Patent: February 13, 2001Assignee: Kyocera Mita CorporationInventors: Masato Katsukawa, Akiyoshi Urano, Ayako Sugase, Mitsuo Ihara, Ichiro Yamazato, Yuka Nakamura