Applying Radiation-sensitive Layer Patents (Class 430/133)
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Patent number: 8372567Abstract: In an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, the photosensitive layer is a positive-charging laminate comprising at least a charge transport layer and a charge generating layer laminated in that order, with the charge generating layer containing at least a resin binder, a charge generating agent, a space filler and an electron transport agent, while the charge transport layer contains at least, as a resin binder, polystyrene and a hole transport agent, and mineral oil of the charge transport layer is in an amount of 1% by mass or less of an amount of polystyrene. Thus, a highly durable and economic positive-charging multilayer electrophotographic photoreceptor and a manufacturing method therefor may be achieved.Type: GrantFiled: May 28, 2009Date of Patent: February 12, 2013Assignee: Fuji Electric Co., Ltd.Inventors: Yoichi Nakamura, Seizo Kitagawa, Hiroshi Emori, Yasushi Tanaka, Hiroyuki Ichiyanagi
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Publication number: 20130029266Abstract: The present invention provides a method for producing an electrophotographic photosensitive member including a surface layer, the method including the steps of: forming a coat for the surface layer on the support by applying a surface-layer coating solution and forming the surface layer by drying the coat, wherein the surface-layer coating solution includes a resin ?, a resin ?, a solvent ? and a compound ?.Type: ApplicationFiled: June 8, 2012Publication date: January 31, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Kazumichi Sugiyama, Daisuke Tanaka, Tsutomu Nishida
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Publication number: 20130022904Abstract: An electrophotographic photoreceptor and a manufacturing method therefore are disclosed. The electrophotographic photoreceptor includes a conductive base; and a photosensitive layer provided on the conductive base and containing a diadamantyl diester compound represented by General Formula (I) below: where, R1, R2 and R3 each independently represent a hydrogen atom, halogen atom, optionally substituted C1-6 alkyl group, optionally substituted C1-6 alkoxyl group, C6-20 aryl group or heterocyclic group, X and Z represent single bonds or optionally substituted C1-6 alkylene groups, and Y represents an OCO group or COO group. The electrophotographic photoreceptor has sufficient wear resistance and satisfactory properties as a photoreceptor, while being little affected by harmful gasses and environmental temperature and humidity.Type: ApplicationFiled: March 1, 2010Publication date: January 24, 2013Inventors: Fengqiang Zhu, Yoichi Nakamura, Shinjiro Suzuki
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Patent number: 8354210Abstract: An electrophotographic photoconductor that stabilizes electrical performances and prevents generation of image faults such as memories, irrespective of types of organic materials of resin binder and charge transport material, and variation of temperature and humidity of the operation environment. An electrophotographic photoconductor includes at least a photosensitive layer formed over a conductive substrate, wherein the photosensitive layer contains a cyclohexane dimethanol-diaryl ester compound represented by the formula (I): in formula (I), each of R1 through R10 represents independently, a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group of carbon number of from 1 to 5, a substituted or unsubstituted aryl group, or a substituted or unsubstituted alkoxy group of carbon number of from 1 to 5.Type: GrantFiled: April 5, 2007Date of Patent: January 15, 2013Assignee: Fuji Electric Co., Ltd.Inventors: Ikuo Takaki, Yoichi Nakamura, Kazuki Nebashi
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Publication number: 20120301178Abstract: An electrophotographic photosensitive member having a surface layer that contains a polymer produced by the polymerization of a compound having a chain-polymerizable functional group. The compound having a chain-polymerizable functional group is a compound represented by the formula (1).Type: ApplicationFiled: May 22, 2012Publication date: November 29, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Masaki Nonaka, Masato Tanaka
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Publication number: 20120301177Abstract: An electrophotographic photosensitive member that includes the outermost surface layer formed by curing a mixture of a charge transporting substance having a chain-polymerizable functional group and a urea compound represented by the following formula (1) or (2), and a process cartridge and an electrophotographic apparatus each including the electrophotographic photosensitive member.Type: ApplicationFiled: May 22, 2012Publication date: November 29, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Masato Tanaka, Masaki Nonaka
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Publication number: 20120301181Abstract: An electrophotographic photosensitive member comprises a charge-transporting layer which is a surface layer of the electrophotographic photosensitive member; wherein the charge-transporting layer has a matrix-domain structure having: a matrix comprising: at least one resin selected from the group consisting of a polycarbonate resin C and a polyester resin D; and at least one charge-transporting substance selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (1?), and a domain comprising a polycarbonate resin A.Type: ApplicationFiled: August 18, 2011Publication date: November 29, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Harunobu Ogaki, Kazunori Noguchi, Atsushi Okuda, Shio Murai, Kazuhisa Shida, Takashi Anezaki
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Publication number: 20120301182Abstract: The present invention is an electrophotographic photosensitive member including a charge-transporting layer as the surface layer of the electrophotographic photosensitive member having a matrix-domain structure including: a matrix including a component ? (at least one resin of a polycarbonate resin C having a specific repeating structural unit and a polyester resin D having a specific repeating structural unit), and ? (charge-transporting substance having a specific structure); and a domain including a component ? (polycarbonate resin A having a repeating structural unit containing a specific siloxane moiety).Type: ApplicationFiled: October 5, 2011Publication date: November 29, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Takashi Anezaki, Kazunori Noguchi, Shio Murai, Kazuhisa Shida, Atsushi Okuda, Harunobu Ogaki
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Patent number: 8309287Abstract: A developing roller has a mandrel, an elastic layer and a cover layer as a surface layer. The cover layer includes a silicon oxide film containing a carbon atom chemically bonded to a silicon atom. In the silicon oxide film, the proportion of the total number of the elements of silicon, oxygen, carbon and hydrogen to the number of all detected elements, as detected with a high-frequency glow discharge light-emission surface analysis method, is 90% or more. The silicon oxide film has an abundance ratio of an oxygen atom chemically bonded to a silicon atom to silicon atoms, (O/Si), of 0.65 or more but 1.95 or less and an abundance ratio of a carbon atom chemically bonded to a silicon atom to silicon atoms, (C/Si), of 0.05 or more but 1.65 or less, and has a ratio of the maximum value to the minimum value of the (C/Si) in a thickness direction of the cover layer, of 1.50 to 33.00.Type: GrantFiled: September 3, 2009Date of Patent: November 13, 2012Assignee: Canon Kabushiki KaishaInventors: Yosuke Ata, Genya Anan
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Publication number: 20120263494Abstract: Provided is an electrophotographic photosensitive member which is excellent in terms of both continuous reduction of contact stress with contact members and the like and potential stability during repeated use. A charge transport layer which serves as a surface layer of an electrophotographic photosensitive member has a matrix-domain structure including a matrix containing a component [?] (polycarbonate resin D having a specific repeating structural unit) and a charge-transporting substance and domains containing a component [?] (polycarbonate resin A having a repeating structural unit including a specific siloxane moiety).Type: ApplicationFiled: April 10, 2012Publication date: October 18, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Atsushi Okuda, Harunobu Ogaki, Kazunori Noguchi, Takashi Anezaki, Kazuhisa Shida, Shio Murai
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Patent number: 8252499Abstract: A high-quality, stable image forming apparatus and method which are free from abnormal images, particularly afterimages, after prolonged repeated use by using a photoconductor a conductive substrate and a single-layered photosensitive layer which contains a charge generating material, an electron transporting material, a positive-hole transporting substance and a binder resin, wherein the charge generating material contains crystalline titanyl phthalocyanine having a maximum diffraction peak of at least 27.2° as a diffraction peak ±0.2° of the Bragg angle 2? with respect to the Cu-K? line of the wavelength of 1.542?, further having major peaks at 9.4°, 9.6°, 24.0°, and also having a peak at 7.3° as a diffraction peak on the lowest angle side but not having a peak between the peak of 7.3° and that of 9.Type: GrantFiled: January 26, 2011Date of Patent: August 28, 2012Assignee: Ricoh Company, Ltd.Inventors: Eiji Kurimoto, Keisuke Shimoyama
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Patent number: 8227166Abstract: The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital, apparatuses. Embodiments pertain to an improved electrophotographic imaging member incorporating an outer layer having a nano- to micron-scale pattern imprinted into its surface to lower friction with the cleaning blade and improve print quality and performance. Embodiments also pertain to methods for making the improved imaging member.Type: GrantFiled: July 20, 2009Date of Patent: July 24, 2012Assignee: Xerox CorporationInventors: Woo Soo Kim, Nan-Xing Hu, Yvan Gagnon, Johann Junginger
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Patent number: 8216751Abstract: The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital, apparatuses. Embodiments pertain to an improved flexible electrophotographic imaging member that does not require an anticurl back-coating layer to prevent curling. The charge transport layer of the disclosed embodiments comprises a class of hole transporting plasticizers which act to counteract curling as well as impart good electrical performance to the imaging member.Type: GrantFiled: January 19, 2010Date of Patent: July 10, 2012Assignee: Xerox CorporationInventor: Yuhua Tong
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Patent number: 8178266Abstract: An electrophotographic photoreceptor is provided that contains a conductive substrate, an undercoat layer, a charge generation layer, and a charge transport layer, wherein the under coat layer contains a binder resin and multiple inorganic pigments each having different average primary particle diameters in a total amount of from 75 to 86% by weight, the charge generation layer contains a binder resin and a titanyl phthalocyanine pigment having a specific X-ray diffraction spectrum in an amount of from 70 to 85% by weight, the charge transport layer comprises a specific distyryl compound, and the following formulae (2-1) to (2-3) are satisfied: 0.2?(D(F2)/D(G))?0.5??(2-1) 0.2?D(F1)??(2-2) D(F2)?D(F1)??(2-3) wherein D(F1) (?m) and D(F2) (?m) represent average primary particle diameters of the largest and smallest inorganic pigments, respectively, and D(G) (?m) represents an average primary particle diameter of the titanyl phthalocyanine pigment.Type: GrantFiled: June 23, 2009Date of Patent: May 15, 2012Assignee: Ricoh Company, Ltd.Inventors: Hiromi Tada, Nozomu Tamoto, Tomoyuki Shimada, Takafumi Iwamoto
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Publication number: 20120115076Abstract: A charge generating layer of an electrophotographic photosensitive member contains a charge generating substance, polyvinyl acetal, and a fluorenone derivative.Type: ApplicationFiled: October 31, 2011Publication date: May 10, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Wataru Kitamura, Kenichi Kaku, Mai Murakami
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Publication number: 20120063818Abstract: Disclosed herein is an electrophotographic imaging member comprising a substrate, and a charge generating layer containing a phthalocyanine pigment, a binder, and a solvent. The charge generating layer has a pigment particle separation distance of 28 nm or less after evaporation of the solvent. A coating system, a method of making an electrophotographic imaging member, and a method of printing also are disclosed.Type: ApplicationFiled: November 22, 2011Publication date: March 15, 2012Inventors: Cindy C. Chen, Lanhui Zhang, Linda L. Ferrarese, James M. Markovics, Marc J. LiVecchi, Edward C. Savage, James R. Backus
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Publication number: 20120058422Abstract: Provided is a photoreceptor for electrophotography, a process for producing the photoreceptor, and an electrophotographic apparatus that includes the photoreceptor. The photoreceptor has a photosensitive layer which contains a resin binder that is a copolymerized polyallylate resin. An electrophotographic apparatus having a photoreceptor drum that includes this photoreceptor has a reduced surface frictional resistance throughout the printing period from the beginning to after printing, thus reducing the amount of surface wear while producing satisfactory images.Type: ApplicationFiled: February 16, 2009Publication date: March 8, 2012Applicant: FUJI ELECTRIC CO., LTDInventors: Shinjiro Suzuki, Yoichi Nakamura, Seizo Kitagawa, Fengqiang Zhu, Kazuki Nebashi
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Patent number: 8114563Abstract: An electrophotographic photoreceptor, including: an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate; and a crosslinked surface layer located overlying the photosensitive layer, including: a tri- or more functional radical polymerizable monomer having no charge transport structure; and a radical polymerizable compound having a charge transport structure, wherein the crosslinked surface layer has a surface roughness (Ra) not greater than 0.2 ?m and a peel strength not less than 0.2 N/mm when measured by the SAICAS method.Type: GrantFiled: August 6, 2007Date of Patent: February 14, 2012Assignee: Ricoh Company, LimitedInventors: Mitsuaki Hirose, Yoshiaki Kawasaki, Yoshiki Yanagawa
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Patent number: 8101327Abstract: Disclosed herein is an electrophotographic imaging member comprising a substrate, a charge transport layer and an overcoat layer formed by combining a film forming binder and a hole transporting hydroxy triarylamine compound having at least one hydroxyl functional group that is linked to a ring carbon of an aryl group by an alkyl group having 1 to 12 carbon atoms and is capable of forming at least one of a chemical bond and a physical bond with the film forming binder. Also disclosed is an electrophotographic imaging member with an overcoat layer formed by combining a film forming polycarbonate binder, a hole transport material, a surface energy reducing silicone material comprising a crosslinkable acrylate monomer, and a solvent. Coatings and methods of forming imaging members also are disclosed.Type: GrantFiled: August 31, 2006Date of Patent: January 24, 2012Assignee: Xerox CorporationInventors: Yuhua Tong, Cindy C. Chen, Susan M. VanDusen
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Patent number: 8088540Abstract: An object of the invention is to provide a photoreceptor for electrophotography which has a low residual potential in an initial stage, is inhibited from increasing in residual potential, is prevented from decreasing in charge potential, undergoes little fatigue deterioration even upon repeated use, and is less apt to pose a problem concerning toxicity or environmental pollution. The invention relates to a photoreceptor for electrophotography which has a photosensitive layer containing an aromatic hydroxycarboxylic acid metal complex represented by the following general formula (1): and one or more charge-transporting agents each having an arylaminophenyl group in the molecule.Type: GrantFiled: January 18, 2007Date of Patent: January 3, 2012Assignee: Hodogaya Chemical Co., Ltd.Inventors: Katsumi Abe, Makoto Koike, Atsushi Takesue
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Patent number: 8043784Abstract: The presently disclosed embodiments are directed to charge transport layers useful in electrostatography. More particularly, the embodiments pertain to an improved imaging member having a charge transport layer comprising a top layer and a bottom layer, wherein the layers have varying concentrations of high quality N,N,N?N?-tetra(4-methylphenyl)-(1,1?-biphenyl)-4,4?-diamine to provide tunable discharge rate.Type: GrantFiled: January 31, 2008Date of Patent: October 25, 2011Assignee: Xerox CorporationInventors: Gregory McGuire, Jennifer A. Coggan, Johann Junginger, Nan-Xing Hu, Ah-Mee Hor
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Patent number: 8029957Abstract: An electrophotographic imaging member includes a substrate, a charge generating layer, a charge transport layer, and an overcoating layer, the overcoating layer being a cured film formed from a composition including at least a hydroxyl group-containing polymer or oligomer, a benzoguanamine compound containing at least one —CH2OR group, wherein each such R is independently an H atom or an alkyl group having from 1 to about 20 carbon atoms, and a charge transport compound.Type: GrantFiled: June 1, 2006Date of Patent: October 4, 2011Assignee: Xerox CorporationInventors: Nan-Xing Hu, Kathy L. De Jong, Hany Aziz
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Publication number: 20110189603Abstract: Electrophotographic photoconductor including a conductive substrate; and a photosensitive layer provided on the conductive substrate and including at least a charge generation material; a charge transport material; and a resin binder including a copolymer polyarylate resin represented by general formula (I) below: and manufacturing method therefore. Good images with less cracking occurrence are obtained during recycling of a photosensitive drum and peripheral members thereof that includes the electrophotographic photoconductor, and also when a liquid development process is employed.Type: ApplicationFiled: April 2, 2009Publication date: August 4, 2011Applicant: FUJI ELECTRIC SYSTEMS CO., LTD.Inventors: Ikuo Takaki, Yoichi Nakamura, Seizo Kitagawa, Kazuki Nebashi, Fengqiang Zhu
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Publication number: 20110183255Abstract: A high-quality, stable image forming apparatus and method which are free from abnormal images, particularly afterimages, after prolonged repeated use by using a photoconductor a conductive substrate and a single-layered photosensitive layer which contains a charge generating material, an electron transporting material, a positive-hole transporting substance and a binder resin, wherein the charge generating material contains crystalline titanyl phthalocyanine, and the electron transporting material contains a compound represented by the following General Formula (1),Type: ApplicationFiled: January 26, 2011Publication date: July 28, 2011Inventors: Eiji Kurimoto, Keisuke Shimoyama
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Publication number: 20110183246Abstract: An ethylene compound having general formula (I) below: wherein R1, R2 and R3 are each independently a hydrogen atom, a halogen atom, an alkyl group of 1 to 6 carbons or an alkoxyl group of 1 to 6 carbons; R4 is an alkyl group of 1 to 3 carbons, phenyl or tolyl; and Ar is an aryl group of 7 to 20 carbons or a heterocyclic group, functions as a charge transport material in an electrophotographic photoreceptor. This compound suppresses photodeterioration, causes little light-induced fatigue, can prevent a rise in the residual potential associated with such light-induced fatigue, has stable properties as an electrophotographic photoreceptor even when used for an extended period of time, and is able to stably provide a satisfactory image.Type: ApplicationFiled: July 9, 2009Publication date: July 28, 2011Applicant: FUJI ELECTRIC SYSTEMS CO., LTDInventors: Fengqiang Zhu, Yoichi Nakamura, Ikuo Takaki, Seizo Kitagawa, Shinjirou Suzuki
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Publication number: 20110177439Abstract: The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital, apparatuses. Embodiments pertain to an improved flexible electrophotographic imaging member that does not require an anticurl back-coating layer to prevent curling. The charge transport layer of the disclosed embodiments comprises a class of hole transporting plasticizers which act to counteract curling as well as impart good electrical performance to the imaging member.Type: ApplicationFiled: January 19, 2010Publication date: July 21, 2011Applicant: XEROX CORPORATIONInventor: Yuhua Tong
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Publication number: 20110129768Abstract: According to aspects of the present invention, an electrophotographic photosensitive member includes a surface layer comprising a cured resin obtained by polymerizing a compound having at least one polymerizable functional group. Aspects of the present invention provide an electrophotographic photosensitive member whose surface layer comprises a compound (urea derivative) having a certain structure, a method for producing the electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus including the electrophotographic photosensitive member.Type: ApplicationFiled: October 26, 2010Publication date: June 2, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Masaki Nonaka, Masato Tanaka, Masataka Kawahara, Michiyo Sekiya, Akira Yoshida
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Patent number: 7951516Abstract: The electrophotographic photoreceptor of the present invention includes a cylindrical support; a charge-generating layer and a charge-transporting layer that are layered onto the cylindrical support in this sequence from the cylindrical support side. The charge-transporting layer includes a charge transport material, and resins including a curable resin and a thermoplastic resin. The proportion of the content of the curable resin with respect to the total amount of the resins in the charge-transporting layer increases in the layer thickness direction with distance from the charge-generating layer side.Type: GrantFiled: May 29, 2007Date of Patent: May 31, 2011Assignee: Fuji Xerox Co., Ltd.Inventors: Tomotake Inagaki, Kazuyuki Tada, Tomomasa Sato, Naoki Morita, Kenji Ikeda
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Publication number: 20110091799Abstract: In an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, the photosensitive layer is a positive-charging laminate comprising at least a charge transport layer and a charge generating layer laminated in that order, with the charge generating layer containing at least a resin binder, a charge generating agent, a space filler and an electron transport agent, while the charge transport layer contains at least, as a resin binder, polystyrene and a hole transport agent, and mineral oil of the charge transport layer is in an amount of 1% by mass or less of an amount of polystyrene. Thus, a highly durable and economic positive-charging multilayer electrophotographic photoreceptor and a manufacturing method therefor may be achieved.Type: ApplicationFiled: May 28, 2009Publication date: April 21, 2011Inventors: Yoichi Nakamura, Seizo Kitagawa, Hiroshi Emori, Yasushi Tanaka, Hiroyuki Ichiyanagi
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Patent number: 7855040Abstract: A method for preparing a photoreceptor including forming a photosensitive layer overlying an electroconductive substrate; coating a liquid including a radically polymerizable compound to form a protective layer; irradiating the protective layer with light to crosslink the protective layer; and then contacting the protective layer with a fluid, which is selected from the group consisting of supercritical fluids and subcritical fluids and which includes a charge transport material. A photoreceptor prepared by the method. An image forming method, an image forming apparatus and a process cartridge using the photoreceptor.Type: GrantFiled: October 29, 2007Date of Patent: December 21, 2010Assignee: Ricoh Company LimitedInventors: Yoshiki Yanagawa, Michio Kimura, Nozomu Tamoto, Hiromi Tada, Tetsuya Toshine, Tomoyuki Shimada, Chiaki Tanaka
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Publication number: 20100316423Abstract: An electrophotographic photoreceptor including a conductive substrate, a photosensitive layer, and a cross-linked resin surface layer comprising a cross-linked resin having a charge transport structure, which satisfies the following inequations: 0.01<WRa(LLH)<0.04??(1-1) 0.01<WRa(LML)<0.04??(1-2) 0.01<WRa(LMH)<0.04??(1-3) 0.01<WRa(LHL)<0.04??(1-4) WRa(LHL)>WRa(LHH)??(2-1) WRa(LHL)>WRa(HLH)??(2-2) WRa(LHL)>WRa(HML)??(2-3) WRa(LHL)>WRa(HMH)??(2-4) WRa(LHL)>WRa(HHL)??(2-5) WRa(LHL)>WRa(HHH)??(2-6) wherein WRa (?m) represents an arithmetic average roughness according to JIS-B0601:2001 of frequency components that are obtained by subjecting a one-dimensional data array of a surface profile of the electrophotographic photoreceptor to a wavelet transformation multiresolution analysis.Type: ApplicationFiled: June 15, 2010Publication date: December 16, 2010Applicant: RICOH COMPANY, LTD.Inventors: Hidetoshi Kami, Yukio Fujiwara, Kazuhiro Egawa
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Patent number: 7838190Abstract: An electrophotographic photosensitive member having excellent electrophotographic properties, a method of manufacturing the electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member are provided. The surface layer of the electrophotographic photosensitive member includes a polymer having a specific repeating structural unit and fluorine-atom-containing resin particles. The fluorine-atom-containing particles in the surface layer are dispersed so as to be provided with particle sizes almost up to those of primary particles.Type: GrantFiled: January 14, 2009Date of Patent: November 23, 2010Assignee: Canon Kabushiki KaishaInventors: Harunobu Ogaki, Nobumichi Miki, Kazunori Noguchi, Nobuo Kosaka
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Patent number: 7811728Abstract: An imaging member including a substrate; thereover a charge generating layer; thereover a first charge transport layer comprising a small molecule charge transport material and a polymeric component selected from the group consisting of polyarylamine polyester, polyacylamine, and mixtures and combinations thereof; and a second charge transport layer disposed over the first charge transport layer, the second charge transport layer comprising a small molecule charge transport material and a binder, wherein the second charge transport layer is free of polyarylamine polyester and polyacylamine.Type: GrantFiled: December 1, 2006Date of Patent: October 12, 2010Assignee: Xerox CorporationInventors: David M. Skinner, John F. Yanus, Markus R. Silvestri, M. John Hinckel, Kenny-Tuan T. Dinh, Susan VanDusen, Satish Parikh, J. Robinson Cowdery-Corvan
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Patent number: 7799501Abstract: Methods for making dispersions, which are of various rheologies, various pigment/binder ratios, various particle sizes, and possess less impurities or large particles are provided. These dispersions may be utilized to form layers of photoreceptors.Type: GrantFiled: May 31, 2007Date of Patent: September 21, 2010Assignee: Xerox CorporationInventors: Lanhui Zhang, Lin Ma, Keith T. Wong
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Patent number: 7799140Abstract: The disclosed embodiments are directed to processes for removing photoreceptor coatings from a substrate, wherein the photoreceptor coatings disposed over a substrate of an electrophotographic photoreceptor. More specifically, the invention discloses a photoreceptor coatings removal process comprises subjecting an electrophotographic photoreceptor to a stripping solution that separates the coatings from the substrate.Type: GrantFiled: June 17, 2009Date of Patent: September 21, 2010Assignee: Xerox CorporationInventors: Robert P. Altavela, Yuhua Tong, Edward F. Grabowski, Kent J. Evans, Adilson Ramos, Nancy Belknap, Helen R. Cherniack
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Patent number: 7781137Abstract: A method for producing a high-quality and low-cost laminate type electrophotographic photoreceptor having a coating film of uniform thickness with high efficiency is provided. In the electrophotographic photoreceptor having a laminated structure composed at least of two layers: a charge generating layer containing a charge generating substance and a charge transporting layer containing a charge transporting substance, the charge generating layer is formed by applying a coating solution for forming the charge generating layer onto the conductive support by an ink-jet coating method, and the charge transporting layer is formed by applying a coating solution for forming the charge transporting layer onto the charge generating layer by a roll coating method.Type: GrantFiled: April 26, 2005Date of Patent: August 24, 2010Assignee: Sharp Kabushiki KaishaInventors: Mikio Kakui, Takatsugu Obata, Masanori Kinomoto
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Patent number: 7767374Abstract: An method for producing an electrophotographic proreceptor includes a first coating step of applying a coating liquid containing a sublimable antioxidant and a photoconductive substance, onto a conductive substrate to form a first coating film thereon, a first drying step of drying the formed first coating film by heating to form a first photosensitive layer, a second coating step of applying the coating liquid used in the first coating step, onto the first photosensitive layer to form a second coating film, and a second drying step of drying the formed second coating film by heating to form a second photosensitive layer. In the second drying step, the drying condition is made to differ from the drying condition in the first drying step so that a degree of sublimation of the antioxidant in the second drying step is lower than that of sublimation of the antioxidant in the first drying step.Type: GrantFiled: December 14, 2006Date of Patent: August 3, 2010Assignee: Sharp Kabushiki KaishaInventors: Akiko Kihara, Rikiya Matsuo
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Patent number: 7759034Abstract: The present invention relates to an electrophotographic photosensitive member and an image forming apparatus provided with the electrophotographic photosensitive member. The electrophotographic photosensitive member includes a cylindrical body and a photosensitive layer formed on a circumferential surface of the cylindrical body and including a latent image forming area and a non-latent image forming area. The photosensitive layer includes a stress relaxation portion at the non-latent image forming area for releasing stress applied between the cylindrical body and the photosensitive layer. The present invention further relates to a method of producing the electrophotographic photosensitive member.Type: GrantFiled: November 28, 2006Date of Patent: July 20, 2010Assignee: Kyocera CorporationInventor: Kouichi Nakano
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Patent number: 7740997Abstract: An electrophotographic imaging member includes a substrate, a photogenerating layer, and an optional overcoating layer, where the photogenerating layer includes a multi-block polymeric charge transport material at least partially embedded within a carbon nanotube material.Type: GrantFiled: August 8, 2006Date of Patent: June 22, 2010Assignee: Xerox CorporationInventors: Timothy P. Bender, Nan-Xing Hu
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Patent number: 7736705Abstract: This method to make an original photoconductor or replacement element uses a two-slot coating process to substantially simultaneously deposit a new SMTL coating layer and a thinner overcoating on an already existing SMTL layer or on a substrate. The total thickness of the existing SMTL layer plus the new SMTL layer plus the overcoating thickness should not exceed the thickness of a belt area of a marking machine or corresponding components in the to be replaced photoconductor element or the tolerances set for said SMTL and overcoating layer when making a new belt.Type: GrantFiled: November 1, 2006Date of Patent: June 15, 2010Assignee: Xerox CorporationInventor: Robert J. Meyer
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Publication number: 20100143838Abstract: Silver halide photographic photosensitive materials are disclosed. A silver halide photographic photosensitive material has a support, and on or above the support, a red-sensitive silver halide emulsion layer, a first interlayer, a green-sensitive silver halide emulsion layer, a second interlayer, and a blue-sensitive silver halide emulsion layer in this order from the support, wherein the first interlayer includes a chelating agent and another silver halide photographic photosensitive material has, in the following order, a support, and provided on or above the support, a first interlayer containing a chelating agent, a blue-sensitive silver halide emulsion layer, a second interlayer, a red-sensitive silver halide emulsion layer, a third interlayer, a green-sensitive silver halide emulsion layer, and a protective layer.Type: ApplicationFiled: November 27, 2009Publication date: June 10, 2010Applicant: FUJIFILM CORPORATIONInventors: Hiroya YOSHIOKA, Hidekazu SAKAI, Shigeru SHIBAYAMA
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Patent number: 7718331Abstract: An electrophotographic photosensitive member is disclosed which is excellent in cleaning performance, has improved durability, and suppresses image defects in various environments. The electrophotographic photosensitive member has a support and a photosensitive layer provided on the support. Depressed portions independent of one another are formed on the surface of the electrophotographic photosensitive member so that the number of the depressed portions per 100 ?m square is 76 or more and 1,000 or less. The openings of the depressed portions have an average major axis diameter of more than 3.0 ?m and 14.0 ?m or less.Type: GrantFiled: June 28, 2007Date of Patent: May 18, 2010Assignee: Canon Kabushiki KaishaInventors: Hiroki Uematsu, Harunobu Ogaki, Masataka Kawahara, Atsushi Ochi, Akira Shimada, Akio Maruyama, Kyoichi Teramoto, Toshihiro Kikuchi, Akio Koganei, Takayuki Sumida
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Publication number: 20100086866Abstract: The presently disclosed embodiments are directed to an improved imaging member exhibiting little or no plywood print defect comprising an undercoat layer formed from an undercoat layer dispersion comprising silica microspheres, a binder resin and a solvent, and a method for making the undercoat layer.Type: ApplicationFiled: October 8, 2008Publication date: April 8, 2010Applicant: XEROX CORPORATIONInventors: Francisco J. Lopez, Man K. Yip, Robert P. Altavela, Adilson P. Ramos
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Publication number: 20100028791Abstract: An electrophotographic photoconductor that stabilizes electrical performances and prevents generation of image faults such as memories, irrespective of types of organic materials of resin binder and charge transport material, and variation of temperature and humidity of the operation environment. An electrophotographic photoconductor includes at least a photosensitive layer formed over a conductive substrate, wherein the photosensitive layer contains a cyclohexane dimethanol-diaryl ester compound represented by the formula (I): in formula (I), each of R1 through R10 represents independently, a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group of carbon number of from 1 to 5, a substituted or unsubstituted aryl group, or a substituted or unsubstituted alkoxy group of carbon number of from 1 to 5.Type: ApplicationFiled: April 5, 2007Publication date: February 4, 2010Applicant: Fuji Electric Device Technology Co.,Ltd.Inventors: Ikou Takaki, Yoichi Nakamura, Kazuki Nebashi
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Patent number: 7642025Abstract: The invention provides an electrophotographic photoreceptor having a cylindrical support, and a charge-generating layer and a charge-transporting layer on or above the cylindrical support, wherein the thickness of the charge-generating layer is increased from the central portion in the axial direction of the cylindrical support towards both end portions thereof, and the difference in thickness between the two end portions is 2.5% or less of an average thickness of the charge-generating layer. Also disclosed are a method of producing the electrophotographic photoreceptor, a process cartridge including the electrophotographic photoreceptor, and an image-forming apparatus.Type: GrantFiled: April 4, 2007Date of Patent: January 5, 2010Assignee: Fuji Xerox Co., Ltd.Inventors: Kazuyuki Tada, Masaru Agatsuma, Tomotake Inagaki, Tomomasa Sato, Toru Asahi, Naoki Morita, Kenji Ikeda
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Patent number: 7629095Abstract: An electrophotographic imaging member includes a substrate, a charge generating layer, and a charge transport layer, where the charge generating layer includes a photogenerating material and a hydroxyl group-containing polymeric compound.Type: GrantFiled: July 19, 2006Date of Patent: December 8, 2009Assignee: Xerox CorporationInventors: Cuong Vong, Ah-Mee Hor
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Patent number: 7622238Abstract: A process for producing an electrophotographic photosensitive member, which has the step of bringing i) the surface of an electrophotographic photosensitive member having at least a charge transport layer on a cylindrical support and ii) a mold having a fine unevenness surface profile into pressure contact with each other to transfer the fine unevenness surface profile to the surface of the electrophotographic photosensitive member. The mold and the support are so temperature-controlled as to be T3<T1<T2 where the glass transition temperature of the charge transport layer is represented by T1 (°C.), the temperature of the mold by T2 (°C.), and the temperature of the support by T3 (°C.).Type: GrantFiled: June 28, 2007Date of Patent: November 24, 2009Assignee: Canon Kabushiki KaishaInventors: Hiroki Uematsu, Akira Shimada, Masataka Kawahara, Harunobu Ogaki, Atsushi Ochi, Akio Maruyama, Kyoichi Teramoto, Toshihiro Kikuchi, Akio Koganei, Takayuki Sumida
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Patent number: 7592111Abstract: An electrostatographic imaging member formulated with a liquid carbonate is provided. The imaging electrostatographic member exhibits improved service life.Type: GrantFiled: November 5, 2004Date of Patent: September 22, 2009Assignee: Xerox CorporationInventors: Robert C. U. Yu, Satchidanand Mishra, Anthony M. Horgan, Richard L. Post, Yuhua Tong, Edward F. Grabowski, Kathleen M. Carmichael, Markus R. Silvestri
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Publication number: 20090233196Abstract: Embodiments of a photoconductor comprise an electrically conductive substrate, a charge generation layer disposed over the electrically conductive substrate, wherein the charge generation layer comprises titanyl phthalocyanine and copper phthalocyanine, and a charge transport layer disposed over the charge generation layer.Type: ApplicationFiled: March 14, 2008Publication date: September 17, 2009Inventors: Mark Thomas Bellino, Weimei Luo, Scott Daniel Reeves, Tanya Yvonne Thames
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Publication number: 20090197196Abstract: The presently disclosed embodiments are directed to charge transport layers useful in electrostatography. More particularly, the embodiments pertain to an improved imaging member having a charge transport layer comprising a top layer and a bottom layer, wherein the layers have varying concentrations of high quality N,N,N?N?-tetra(4-methylphenyl)-(1,1?-biphenyl)-4,4?-diamine to provide tunable discharge rate.Type: ApplicationFiled: January 31, 2008Publication date: August 6, 2009Applicant: XEROX CORPORATIONInventors: Gregory McGuire, Jennifer A. Coggan, Johann Junginger, Nan-Xing Hu, Ah-Mee Hor