Polymeric Arylamine Containing Patents (Class 430/58.7)
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Patent number: 8309286Abstract: The invention provides an electrophotographic photoreceptor having at least a conductive substrate and a photosensitive layer formed on the conductive substrate wherein the outermost surface layer of the photoreceptor is composed of a cured material containing at least one compound represented by the formula (I) and a surfactant that contains, in the molecule thereof, at least one structure selected from (A) a structure that is obtained by polymerizing an acrylic monomer having a fluorine atom, (B) a structure having a carbon-carbon double bond and a fluorine atom, (C) an alkyleneoxide structure, and (D) a structure having a carbon-carbon triple bond and a hydroxy group. In formula (I), Q is an organic group having a valency of n and having hole transportability, R is a hydrogen atom or an alkyl group, L is a divalent organic group, n is 1 or more, and j is 0 or 1.Type: GrantFiled: April 27, 2009Date of Patent: November 13, 2012Assignee: Fuji Xerox Co., Ltd.Inventors: Wataru Yamada, Katsumi Nukada, Takatsugu Doi, Akira Hirano, Hitoshi Takimoto
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Patent number: 8293439Abstract: An electrophotographic photoreceptor including a conductive substrate, a photosensitive layer, and a surface layer, which satisfies the following inequations: 0.005<WRa(LMH)<0.03??(i) 0.010<WRa(LHH)<0.03??(ii) 0.005<WRa(LML)<0.20??(iii) WRa(LLH)>WRa(LMH)??(iv) WRa(LLH)>WRa(LHH)??(v) wherein WRa (?m) represents a center-line average roughness of frequency components LHH, LHL, LMH, LML, LLH, and LLL that are obtained by subjecting a one-dimensional data array of a surface profile of the electrophotographic photoreceptor to wavelet transformation multiresolution analysis so as to be separated into 6 frequency components; thinning a one-dimensional data array of the lowest frequency component so that the number of data array is reduced to 1/40; and subjecting the thinned one-dimensional data array to wavelet transformation multiresolution analysis so as to be separated into the 6 frequency components LHH, LHL, LMH, LML, LLH, and LLL.Type: GrantFiled: March 12, 2010Date of Patent: October 23, 2012Assignee: Ricoh Company, Ltd.Inventors: Yukio Fujiwara, Hidetoshi Kami, Kazuhiro Egawa, Shinji Nohsho, Mayumi Yoshihara, Mihoko Matsumoto, Kohsuke Yamamoto
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Patent number: 8283433Abstract: The present invention is directed to a polycarbonate resin comprising a structural unit represented by the following general formula (I), wherein the structural unit of general formula (I) occupies 5 to 100 mol % relative to all the structural units, and the limiting viscosity of the polycarbonate resin is 0.3 to 2.0 dl/g: wherein in the formula, R1 through R8 independently represent a hydrogen atom, a halogen group, an alkyl group having a carbon number of 1 through 9, an aryl group having a carbon number of 6 through 12, an alkenyl group having a carbon number of 2 through 5, an alkoxy group having a carbon number of 1 through 5, or an aralkyl group having a carbon number of 7 through 17.Type: GrantFiled: July 31, 2007Date of Patent: October 9, 2012Assignee: Mitsubishi Gas Chemical Company, Inc.Inventor: Jun Tajima
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Patent number: 8283096Abstract: An electrophotographic photoreceptor comprising: a conductive substrate; a photosensitive layer formed on the conductive substrate; and an outermost surface layer that is a layer made of a cured material of a composition including at least one compound represented by the following formula (I) and at least one compound having charge transportability and an azo group: wherein in formula (I), F represents an n-valent organic group having a hole transporting property, R represents a hydrogen atom or an alkyl group, L represents a divalent organic group, n represents an integer of 1 or more, and j represents 0 or 1.Type: GrantFiled: August 31, 2009Date of Patent: October 9, 2012Assignee: Fuji Xerox Co., Ltd.Inventors: Wataru Yamada, Katsumi Nukada, Masahiro Iwasaki, Akira Hirano, Takatsugu Doi
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Publication number: 20120251932Abstract: Provided is an electrophotographic photoreceptor having a conductive substrate and a photosensitive layer, such that the layer constituting the outermost surface of the photosensitive layer is formed by polymerizing a cross-linkable charge transporting material having a reactive hydroxyl group and a cross-linkable charge transporting material having a reactive alkoxy group, and the ionization potential of the outer surface of the layer constituting the outermost surface is higher by about 0.1 eV or more than the ionization potential of the inner surface of the layer constituting the outermost surface.Type: ApplicationFiled: August 25, 2011Publication date: October 4, 2012Applicant: FUJI XEROX CO., LTD.Inventors: Masahiro IWASAKI, Jiro KORENAGA, Yuko YAMANO, Yukimi KAWABATA, Daisuke HARUYAMA
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Patent number: 8273509Abstract: To realize an electrophotographic photoreceptor excellent in abrasion resistance, the photosensitive layer of the photoreceptor comprises a polyester resin containing a repeating structural unit represented by the formula (1) and a hydrazone compound. (In the formula (1), Ar1 to Ar4 each represents, independently of each other, an arylene group which may have a substituent. X1 represents a bivalent group (including a single bond) and X2 represents a bivalent group (including a single bond) with 3 or less atoms.Type: GrantFiled: January 9, 2007Date of Patent: September 25, 2012Assignee: Mitsubishi Chemical CorporationInventors: Yuka Nagao, Tadashi Mizushima, Masami Tsurumori, Tomoko Nakagawa, Hiroaki Takamura, Shunichirou Kurihara, Tooru Uenaka, Masayuki Hiroi
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Patent number: 8263300Abstract: The present invention provides an electrophotographic photoconductor having a support, at least an intermediate layer, and a photosensitive layer, the intermediate layer and photosensitive layer being laid in this order over the support, wherein the intermediate layer comprises an amorphous oxide semiconductor.Type: GrantFiled: February 27, 2009Date of Patent: September 11, 2012Assignee: Ricoh Company, Ltd.Inventor: Tetsuya Toshine
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Patent number: 8247143Abstract: A photoreceptor including an electroconductive substrate, a photosensitive layer located overlying the electroconductive substrate, and a surface layer located overlying the photosensitive layer, wherein the surface layer is a cross linked surface layer comprising filler particulates on which linear scar is formed along the circumference direction, and the filler particulates form concave portions on a groove formed by the linear scar, and wherein the ten point average roughness Rz along the direction of the rotation axis of the photoreceptor measured on the circumference surface thereof is from 0.17 to 2.00 ?m and the average distance Sm of concavities and convexities along the direction of the rotation axis of the photoreceptor measured on the circumference surface thereof is from 20 to 500 ?m, and the ten point average roughness Rz along the circumference direction of the photoreceptor measured on the circumference surface thereof is from 0.13 to 0.Type: GrantFiled: November 6, 2009Date of Patent: August 21, 2012Assignee: Ricoh Company, Ltd.Inventors: Kazuhiro Egawa, Yukio Fujiwara, Hidetoshi Kami
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Patent number: 8227156Abstract: To provide an electrophotographic photoconductor that has a layer containing a compound represented by the following general formula (1), and an image forming apparatus using the electrophotographic photoconductor. where R1 and R2 independently represent any one of a hydrogen atom, substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group and substituted or unsubstituted aralkyl group, and R3, R4, R5, R6, R7, R8, R9 and R10 independently represent any one of a hydrogen atom, halogen atom, cyano group, nitro group, amino group, hydroxyl group, substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group and substituted or unsubstituted aralkyl group.Type: GrantFiled: November 5, 2010Date of Patent: July 24, 2012Assignee: Ricoh Company, Ltd.Inventors: Keisuke Shimoyama, Eiji Kurimoto, Tatsuya Niimi, Shinichi Kawamura, Yoshiki Yanagawa
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Patent number: 8202674Abstract: Polymers of naphthalene tetracarboxylic diimide dimmers are provided. The polymers are of the Formula I wherein the A units are selected from and Formula IX The polymers are suitable for use in the active layer of an imaging member and exhibit properties of both a binder and an electron-transporting material.Type: GrantFiled: October 11, 2010Date of Patent: June 19, 2012Assignee: Xerox CorporationInventors: Timothy P. Bender, John Graham, James M. Duff
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Patent number: 8173996Abstract: A semiconductive hole transport material containing polar substituent groups, the polar substituent groups substantially not affecting the electronic properties of the hole transport material and the hole transport material being soluble in a polar solvent.Type: GrantFiled: October 11, 2005Date of Patent: May 8, 2012Assignees: Cambridge Display Technology Limited, CDT Oxford LimitedInventors: Carl R. Towns, Caroline Towns, legal representative, Mary J. McKiernan, Annette Steudel
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Patent number: 8170449Abstract: An image forming apparatus including an image bearing member which has an electroconductive substrate, a photosensitive layer overlying the electroconductive substrate and a cross-linked resin surface layer overlying the photosensitive layer and bears a latent electrostatic image on the surface thereof, an application device to apply a solid lubricant to the image bearing member; a charging device to charge the surface of the image bearing member, an irradiation device to irradiate the surface of the image bearing member with light to form the latent electrostatic image thereon, a development device to develop the latent electrostatic with toner to obtain a developed image, a transfer device to transfer the developed image to a recording medium, and; a cleaning device to clean the surface of the image bearing member, wherein the cross-linked resin surface layer includes a cross-linked body of trimethylol propane triacrylate and particulates including silicon and an average diameter of agglomeration areas of tType: GrantFiled: February 20, 2009Date of Patent: May 1, 2012Assignee: Ricoh Company Ltd.Inventors: Hidetoshi Kami, Yukio Fujiwara, Kazuhiro Egawa
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Patent number: 8120719Abstract: A photo-addressable display medium is provided, the photo-addressable display medium including: a pair of electrodes having transparency; a photoconductive layer disposed between the pair of electrodes and having a laminated structure of a first charge generation layer, a charge transport layer and a second charge generation layer in this order from an exposing light irradiation side; and a liquid crystal layer disposed between an electrode of the inverse side to the exposing light irradiation side and the second charge generation layer and having memory performance, wherein the first charge generation layer and the second charge generation layer contain a phthalocyanine compound, and the charge transport layer contains a stilbene compound represented by the following formula (1): wherein, R1 to R4 each independently represents a hydrogen atom, a methyl group or an ethyl group.Type: GrantFiled: March 30, 2010Date of Patent: February 21, 2012Assignee: Fuji Xerox Co., Ltd.Inventors: Mieko Seki, Hiroe Okuyama, Yasuhiro Yamaguchi, Tomozumi Uesaka, Hideo Kobayashi
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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: 8097388Abstract: The presently disclosed embodiments are directed to an improved low wear overcoat for an imaging member having a substrate, a charge transport layer, and an overcoat positioned on the charge transport layer, and a process for preparing the same including combining a binder, a hole transport molecule, a melamine formaldehyde crosslinking agent and an acid catalyst dissolved in an alcohol solvent to form an overcoat solution, and subsequently providing the overcoat solution onto the charge transport layer to form an overcoat layer.Type: GrantFiled: March 14, 2008Date of Patent: January 17, 2012Assignee: Xerox CorporationInventors: Matthew A. Heuft, Nan-Xing Hu, Jennifer A. Coggan, Vladislav Skorokhod, Yvan Gagnon, Sarah Kavassalis
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Patent number: 8062823Abstract: The presently disclosed embodiments are directed to an improved overcoat for an imaging member having a substrate, a charge transport layer, and an overcoat positioned on the charge transport layer, and a process for making the same including combining a resin having a reactive group selected from the group consisting of hydroxyl, carboxylic acid and amide groups, a melamine formaldehyde crosslinking agent, a formaldehyde scavenger, an acid catalyst, and an alcohol-soluble charge transporting molecule to form an overcoat solution, and subsequently providing the overcoat solution onto the charge transport layer to form an overcoat layer.Type: GrantFiled: September 13, 2007Date of Patent: November 22, 2011Assignee: Xerox CorporationInventors: John F. Yanus, Kenny-Tuan Dinh, Jin Wu, Dale S. Renfer
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Patent number: 8043773Abstract: An image bearing member including an electrostatic substrate, a photosensitive layer located overlying the electrostatic substrate, a surface layer located overlying the photosensitive layer, and the surface layer is a cross-linking resin layer in which particulates having a needle form are dispersed and which is formed by curing a monomer having at least three radical polymerizable functional groups without a charge transport structure and a radical polymerizable compound having a charge transport structure.Type: GrantFiled: November 16, 2007Date of Patent: October 25, 2011Assignee: Ricoh Company, LimitedInventors: Hiroshi Ikuno, Tetsuro Suzuki, Hidetoshi Kami, Yukio Fujiwara, Hiroshi Tamura
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Patent number: 8029958Abstract: The presently disclosed embodiments are directed to an improved low wear overcoat for an imaging member having a substrate, a charge transport layer, and an overcoat layer positioned on the charge transport layer, and a process for preparing the same, where the overcoat layer includes an aromatic polyol binder, a hole transport molecule, and a melamine formaldehyde curing resin.Type: GrantFiled: July 16, 2008Date of Patent: October 4, 2011Assignee: Xerox CorporationInventors: Yu Qi, Nan-Xing Hu, Vladislav Skorokhod, Yvan Gagnon, Ah-Mee Hor
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Patent number: 8029956Abstract: 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 film forming resin composition including at least a melamine compound, a polyol, and a charge transport compound, where the charge transport compound is represented by: QL-OH]n. where Q represents a charge transport component, L represents a divalent linkage group, and represents a number of repeating segments or groups.Type: GrantFiled: January 13, 2006Date of Patent: October 4, 2011Assignee: Xerox CorporationInventors: Yu Qi, Hany Aziz, Nan-Xing Hu, Ah-Mee Hor, Kenny-Tuan Dinh, John F Yanus
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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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Patent number: 8017294Abstract: The presently disclosed embodiments are directed to an improved overcoat for an imaging member having a substrate, a charge transport layer, and an overcoat positioned on the charge transport layer, and a process for making the same including combining a resin having a reactive group selected from the group consisting of hydroxyl, carboxylic acid and amide groups, a melamine formaldehyde crosslinking agent, a crosslinkable fluoro additive, an acid catalyst, and a crosslinkable, alcohol-soluble charge transport molecule to form an overcoat solution, and subsequently providing the overcoat solution onto the charge transport layer to form an overcoat layer.Type: GrantFiled: September 13, 2007Date of Patent: September 13, 2011Assignee: Xerox CorporationInventors: John F. Yanus, Kenny-Tuan Dinh, Jin Wu, Dale S. Renfer
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Patent number: 7985520Abstract: A photoreceptor including an electroconductive substrate and a photosensitive layer located overlying the electroconductive substrate, the photosensitive layer including a cross-linking surface layer including a cross-linked copolymer of a radical polymerizable monomer (I) having at least three functional groups without a charge transport structure and a radical polymerizable monomer (II) having a charge transport structure, and a polysiloxane-acryl block copolymer having a charge transport property.Type: GrantFiled: November 26, 2008Date of Patent: July 26, 2011Assignee: Ricoh Company, Ltd.Inventors: Hongguo Li, Kazukiyo Nagai, Kyohji Okada, Tamotsu Horiuchi
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Patent number: 7985522Abstract: Disclosed is an electrophotographic photoreceptor which is excellent in wear resistance and electrical characteristics. Specifically disclosed is an electrophotographic photoreceptor containing a polyester resin in a photosensitive layer provided on an electroconductive substrate. The polyester resin is composed of a copolymer represented by the general formula 1 below, which has a viscosity average molecular weight (Mv) of 10,000-300,000 and contains a diphenyl ether 4,4?-dicarboxylic acid component and a bivalent phenol component. In the general formula 1, A represents a diphenyl ether 4,4?-dicarboxylic acid residue represented by the formula A below, and B represents a bivalent phenol residue represented by the formula B below. In the formula A, each of Ra1 and Ra2 independently represents a hydrogen atom or a monovalent substituent which may have a substituent, and each of n and m is independently an integer from 0 to 4.Type: GrantFiled: October 6, 2008Date of Patent: July 26, 2011Assignee: Mitsubishi Chemical CorporationInventors: Hiroyuki Tajima, Yuuta Kumano
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Patent number: 7968263Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and at least one charge transport layer comprised of at least one charge transport component, and wherein the photogenerating layer contains an amine phosphate.Type: GrantFiled: May 30, 2008Date of Patent: June 28, 2011Assignee: Xerox CorporationInventor: Jin Wu
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Patent number: 7960080Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and a charge transport layer, and wherein at least one of the charge transport layer and the photogenerating layer contains an oxadiazole.Type: GrantFiled: March 31, 2008Date of Patent: June 14, 2011Assignee: Xerox CorporationInventor: Jin Wu
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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: 20110076605Abstract: An electrophotographic photoreceptor includes an electroconductive substrate and a photosensitive layer formed thereon, the photosensitive layer including a sub-layer that constitutes an outermost surface of the photosensitive layer, the sub-layer including an organic solvent having a boiling point of from about 65° C. to about 250° C. in an amount of from about 5,000 ppm to about 50,000 ppm, and the sub-layer including a polymer of a charge transporting material having a polymerizable group.Type: ApplicationFiled: March 15, 2010Publication date: March 31, 2011Applicant: FUJI XEROX CO., LTD.Inventors: Takatsugu DOI, Wataru YAMADA, Akira HIRANO, Katsumi NUKADA
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Publication number: 20110053068Abstract: Embodiments pertain to a flexible imaging member used in electrostatography and processes for making and using the imaging member. More particularly, the embodiments pertain to a structurally simplified flexible electrophotographic imaging member that has reasonable flatness and exhibits good performance without the need of an anticurl back coating layer.Type: ApplicationFiled: August 31, 2009Publication date: March 3, 2011Applicant: XEROX CORPORATIONInventors: Robert C. U. Yu, Yuhua Tong, Stephen T. Avery, Michael S. Roetker
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Publication number: 20110053069Abstract: Embodiments pertain to a flexible imaging member used in electrostatography and processes for making and using the imaging member. More particularly, the embodiments pertain to a structurally simplified flexible electrophotographic imaging member that has reasonable flatness and exhibits good performance without the need of an anticurl back coating layer.Type: ApplicationFiled: August 31, 2009Publication date: March 3, 2011Applicant: XEROX CORPORATIONInventors: Robert C. U. Yu, Yuhua Tong, Stephen T. Avery, Michael S. Roetker, Jimmy E. Kelly
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Patent number: 7897313Abstract: An electrostatic latent image bearing member is provided including a substrate and a photosensitive layer located overlying the substrate, wherein the outermost layer of the electrostatic latent image bearing member includes a cross-linked resin formed from a cross-linking reaction between a polyol having 2 or more hydroxyl groups including a reactive charge transport material having a specific formula and an isocyanate compound including an aromatic isocyanate compound having an isocyanate group and an aromatic ring; and the use of the electrostatic latent image bearing member in an image forming apparatus and a process cartridge.Type: GrantFiled: April 5, 2007Date of Patent: March 1, 2011Assignee: Ricoh Company LimitedInventor: Akihiro Sugino
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Patent number: 7862969Abstract: The present invention provides an image bearing member that includes: a photoconductor; and a heating unit which heats the photoconductor, wherein the photoconductor includes: a support; a charge generating layer on the support, a charge transport layer, and a crosslinked charge transport layer in this order, wherein the crosslinked charge transport layer includes a reaction product of a radically polymerizable compound with three or more functional groups which does not have a charge transporting structure, and a radically polymerizable compound with one functional group, which compound has a charge transporting structure.Type: GrantFiled: January 10, 2007Date of Patent: January 4, 2011Assignee: Ricoh Company, Ltd.Inventors: Yasuo Suzuki, Kohichi Ohshima, Tetsuro Suzuki, Michitaka Sasaki
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Patent number: 7865114Abstract: An image forming apparatus including an image bearing member, a charging device, an irradiating device, a developing device, a transfer device, a fixing device, and a cleaning device, wherein the image bearing member includes a substrate on which a photosensitive layer and a cross-linked surface layer are accumulated and the cross-linked surface layer comprises a cross-linked material formed by curing a monomer having at least three radical polymerizable function groups without a charge transport structure and a radical polymerizable compound having a charge transport structure by a photo-energy irradiation device, wherein the toner has a volume average particle diameter of from 1 to 5 ?m and an average circularity of from 0.95 to 0.Type: GrantFiled: November 21, 2007Date of Patent: January 4, 2011Assignee: Ricoh Company LimitedInventors: Masahiko Ishikawa, Masami Tomita, Yoshiaki Kawasaki
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Patent number: 7851114Abstract: An electrostatic latent image bearing member is provided including a substrate and a photosensitive layer located overlying the substrate, wherein the outermost layer of the electrostatic latent image bearing member includes a cross-linked resin formed from a cross-linking reaction between a charge transport polyol having a specific formula and an isocyanate compound; and the use of the electrostatic latent image bearing member in an image forming apparatus, a process cartridge, and an image forming method.Type: GrantFiled: November 21, 2006Date of Patent: December 14, 2010Assignee: Ricoh Company LimitedInventors: Akihiro Sugino, Takaaki Ikegami, Takeshi Takada, Kazukiyo Nagai
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Patent number: 7838188Abstract: A preferred aspect of an electrophotographic photoconductor of the present invention contains a layer containing a hardened material which is prepared by polymerizing (A) a chain-polymerizable group-containing tertiary amine compound in which at least one alkyl group is bound to a nitrogen atom constituting an amine structure through chain polymerization. Another preferred aspect of the electrophotographic photoconductor contains a layer containing a hardened material which is prepared by polymerizing the (A) component, and (B) a chain-polymerizable charge transporting compound through chain polymerization. Still another preferred aspect of the electrophotographic photoconductor contains a layer containing a hardened material which is prepared by polymerizing the (A) component, (B) the chain-polymerizable charge transporting compound, and (C) a trifunctional or more chain-polymerizable compound through chain polymerization.Type: GrantFiled: March 28, 2007Date of Patent: November 23, 2010Assignee: Ricoh Company, Ltd.Inventors: Nobuya Mori, Kazukiyo Nagai, Tomoyuki Shimada, Tetsuro Suzuki, Tetsuya Toshine
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Patent number: 7829251Abstract: Disclosed herein is a flexible imaging member having a high concentration of a charge transport compound having optimum enhanced mechanical and electrical characteristics. By increasing the concentration of the charge transport compound to a level of from about 55 weight percent or more, including from about 55 weight percent to about 70 weight percent, and from about 55 weight percent to about 65 weight percent, a flexible imaging member can be produced with reduced residual voltage and/or improved sensitivity. Furthermore, the fatigue cracking resistance of the charge transport layer can be improved through the implementation of a heat stress release process described more particularly herein.Type: GrantFiled: March 24, 2005Date of Patent: November 9, 2010Assignee: Xerox CorporationInventors: Anthony M. Horgan, Robert C. U. Yu, Satchidanand Mishra
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Patent number: 7811731Abstract: A photoconductive imaging member including at least a charge generating layer, a charge transport layer, and an overcoat layer. The overcoat layer includes a cured or substantially crosslinked product of at least a phenol compound and a charge transport compound.Type: GrantFiled: October 28, 2005Date of Patent: October 12, 2010Assignee: Xerox CorporationInventors: Yu Qi, Nan-Xing Hu
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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: 7799497Abstract: A photoconductor containing an optional supporting substrate, a silanol containing photogenerating layer, at least one charge transport layer, and a top overcoating layer in contact with and contiguous to the charge transport layer.Type: GrantFiled: November 7, 2006Date of Patent: September 21, 2010Assignee: Xerox CorporationInventors: John F Yanus, Jin Wu, Kenny-Tuan Dinh, Michael A. Morgan, Anthony M. Horgan
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Publication number: 20100232831Abstract: An electrophotographic photoreceptor including a conductive substrate, a photosensitive layer, and a surface layer, which satisfies the following inequations: 0.005<WRa(LMH)<0.03??(i) 0.010<WRa(LHH)<0.03??(ii) 0.005<WRa(LML)<0.20??(iii) WRa(LLH)>WRa(LMH)??(iv) WRa(LLH)>WRa(LHH)??(v) wherein WRa (?m) represents a center-line average roughness of frequency components LHH, LHL, LMH, LML, LLH, and LLL that are obtained by subjecting a one-dimensional data array of a surface profile of the electrophotographic photoreceptor to wavelet transformation multiresolution analysis so as to be separated into 6 frequency components; thinning a one-dimensional data array of the lowest frequency component so that the number of data array is reduced to 1/40; and subjecting the thinned one-dimensional data array to wavelet transformation multiresolution analysis so as to be separated into the 6 frequency components LHH, LHL, LMH, LML, LLH, and LLL.Type: ApplicationFiled: March 12, 2010Publication date: September 16, 2010Applicant: RICOH COMPANY, LTD.Inventors: Yukio Fujiwara, Hidetoshi Kami, Kazuhiro Egawa, Shinji Nohsho, Mayumi Yoshihara, Mihoko Matsumoto, Kohsuke Yamamoto
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Patent number: 7764906Abstract: An image forming apparatus, including an electrostatic latent image bearer bearing an electrostatic latent image; an electrostatic latent image former forming the electrostatic latent image on a surface of the latent image bearer; an image developer developing the electrostatic latent image with a developer including a toner to form a toner image on the surface of the image bearer; a transferer transferring the toner image onto a receiving material; a fixer fixing the toner image to the receiving material; and a discharger discharging charges remaining on the image bearer by irradiating the image bearer with discharging light having a wavelength of less than 500 nm, wherein the latent image bearer includes a substrate; and a photosensitive layer overlying the substrate, including a charge generation layer containing an organic charge generation material, and a charge transport layer containing at least one of charge transport materials having the formulae (I) to (IV).Type: GrantFiled: June 26, 2006Date of Patent: July 27, 2010Assignee: Ricoh Company, Ltd.Inventor: Tatsuya Niimi
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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: 7718333Abstract: An electrophotographic photoconductor having a layer of a crosslinked resin obtained by reacting an epoxy group-containing amine compound having a charge transferability-imparting group with at least one silicon compound selected from an epoxy ring-free alkoxysilane compound, an epoxy ring-free silanol compound, an epoxy ring-containing alkoxysilane compound and an epoxy ring-containing silanol compound.Type: GrantFiled: August 28, 2007Date of Patent: May 18, 2010Assignee: Ricoh Company, Ltd.Inventors: Kazukiyo Nagai, Chiaki Tanaka, Tetsuro Suzuki, Hiroshi Ikuno, Hongguo Li
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Patent number: 7718335Abstract: An image bearing member is provided, including a substrate and a surface layer formed by optically curing at least a radical polymerizable compound with a charge transport structure and a radical polymerizable monomer without a charge transport structure, wherein the transmission factor of the surface layer for light having a wavelength by 25 nm longer than an absorption end wavelength of photo-absorption spectrum of the surface layer prior to optical curing is not less than 65%.Type: GrantFiled: December 27, 2006Date of Patent: May 18, 2010Assignee: Ricoh Company LimitedInventors: Yukio Fujiwara, Tetsuro Suzuki, Hiroshi Tamura, Hidetoshi Kami, Tetsuya Toshine, Yoshinori Inaba
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Patent number: 7709170Abstract: A latent electrostatic image bearing member including at least a support, a photoconductive layer on the support and a surface layer on the photoconductive layer, wherein a film having the same composition as the surface layer is formed on a slide glass such that the film had a thickness of 5 ?m; and the haze value measured after rubbing the film with a steel wool of #000 and a load of 500 gf for 50 times is 10% or less.Type: GrantFiled: June 20, 2006Date of Patent: May 4, 2010Assignee: Ricoh Company, Ltd.Inventor: Hidetoshi Kami
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Patent number: 7700248Abstract: Disclosed are polymers which include tertiary aryl amine moieties that can function as hole transport agents and which also have reactive silane groups thereon capable of being condensed to a silsesquioxane composition, as well as the silsesquioxane compositions prepared therefrom. The silsesquioxanes can be coated onto substrates to form abrasion-resistant layers having hole transport properties useful in devices that require charge transport properties, such as light-emitting diodes and organic electrophotographic elements such as photoreceptors or photoconductors. Also disclosed are electrophotographic elements which comprise an electrically conducting layer, a charge generating layer overlying the electrically conducting layer, and a charge transport layer overlying the electrically conducting layer. The charge transport layer, which can be an overcoat overlying the charge generating layer, comprises the condensed reaction product of the disclosed polymers.Type: GrantFiled: July 8, 2003Date of Patent: April 20, 2010Assignee: Eastman Kodak CompanyInventors: Xin Jin, Wayne T. Ferrar, David S. Weiss, Louis J. Sorriero
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Patent number: 7691931Abstract: An organic-inorganic hybrid material, including a charge transportable organic polymer and a metal oxide.Type: GrantFiled: November 10, 2005Date of Patent: April 6, 2010Assignee: Ricoh Company Ltd.Inventors: Hongguo Li, Kazukiyo Nagai
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Patent number: 7674565Abstract: A photoconductive having an overcoat layer that includes a cured or substantially crosslinked product of at least a melamine-formaldehyde resin and a charge transport compound, and an optional phenol compound.Type: GrantFiled: July 25, 2006Date of Patent: March 9, 2010Assignee: Xerox CorporationInventors: Yu Qi, Nan-Xing Hu
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Patent number: 7662533Abstract: An image forming method including: forming an electrostatic latent image on an image bearing member; developing the latent image with a toner; transferring the toner image onto a receiving material; and fixing the toner image. The image bearing member includes a substrate, and a charge generation layer, a charge transport layer and a crosslinked charge transport layer, wherein the crosslinked charge transport layer includes a compound obtained from radical polymerizable monomers including a monomer having three or more functional groups and no charge transport structure and a monomer having one functional group and a charge transport structure. The toner includes a binder resin, a colorant, and a release agent, wherein tetrahydrofuran-soluble components of the binder resin have a molecular weight distribution such that at least one peak is observed in a range of from 1,000 to 10,000 and the half-width of the molecular weight distribution curve is not greater than 15,000.Type: GrantFiled: June 24, 2005Date of Patent: February 16, 2010Assignee: Ricoh Company LimitedInventors: Kohichi Ohshima, Yasuo Suzuki, Tetsuro Suzuki, Michitaka Sasaki
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Patent number: 7629094Abstract: An electrophotographic photoreceptor including an electroconductive substrate and a photosensitive layer located overlying the electroconductive substrate, wherein the photosensitive layer comprises units obtained from a radical polymerizing monomer, in which an aliphatic group having two radical polymerizing groups and a charge transporting group including no radical polymerizing group are connected to each other in a single bond, at the surface thereof.Type: GrantFiled: December 27, 2005Date of Patent: December 8, 2009Assignee: Ricoh Company, Ltd.Inventors: Kazukiyo Nagai, Tetsuro Suzuki, Hiroshi Tamura, Hongguo Li, Tamotsu Horiuchi
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Patent number: 7604913Abstract: Disclosed is an electrophotographic photoreceptor which is excellent in wear resistance and electrical characteristics. Specifically disclosed is an electrophotographic photoreceptor containing a polyester resin in a photosensitive layer provided on an electroconductive substrate. The polyester resin is composed of a copolymer represented by the general formula 1 below, which has a viscosity average molecular weight (Mv) of 10,000-300,000 and contains a diphenyl ether 4,4?-dicarboxylic acid component and a bivalent phenol component. [Chemical Formula 1] A-Bn??(1) In the general formula 1, A represents a diphenyl ether 4,4?-dicarboxylic acid residue represented by the formula A below, and B represents a bivalent phenol residue represented by the formula B below. In the formula A, each of Ra1 and Ra2 independently represents a hydrogen atom or a monovalent substituent which may have a substituent, and each of n and m is independently an integer from 0 to 4.Type: GrantFiled: July 15, 2005Date of Patent: October 20, 2009Assignee: Mitsubishi Chemical CorporationInventors: Hiroyuki Tajima, Yuuta Kumano