Binder For Radiation-conductive Composition Patents (Class 430/96)
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Patent number: 7449271Abstract: An electrophotographic photoconductor and method that seldom generate cracks even while recycling a photoconductor drum and peripheral members or in a liquid developing process, and thereby produce excellent images. The electrophotographic photoconductor includes a conductive substrate and a photosensitive layer comprising a charge generation material and a charge transport material. The photosensitive layer comprises a resin binder of polyarylate resin having structural units represented by the following formula (I): In the formula, R1 and R2 represent a hydrogen atom, an alkyl group, a cycloalkyl group, or an aryl group. R1, R2, and a carbon atom bonding to the R1 and R2 together form a cyclic structure. The cyclic structure is bonded to no more than two arylene groups. Each of R3 through R10 being a hydrogen atom, an alkyl group, a fluorine atom, a chlorine atom, and a bromine atom. The values of m and n satisfy the equation 0.5<m/(m+n)<0.7.Type: GrantFiled: September 7, 2004Date of Patent: November 11, 2008Assignee: Fuji Electric Device Technology Co., Ltd.Inventors: Masaru Kobashi, Yoichi Nakamura, Ikuo Takaki
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Patent number: 7432028Abstract: This invention relates to a novel organophotoreceptor that includes: (a) a charge transport composition comprising molecules having the formula where n is an average of a distribution of integers generally between 2 and 50,000, and in which n is at least 2; R1, R2, R3, and R4 comprise, each independently, H, an alkyl group, an alkenyl group, a heterocyclic group, or an aromatic group; X comprises an (N,N-disubstituted)arylamine group; and Y is a bridging group; (b) a charge generating compound; and (c) an electrically conductive substrate over which the charge transport composition and the charge generating compound are located.Type: GrantFiled: February 4, 2004Date of Patent: October 7, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Vytautas Getautis, Tadas Malinauskas, Juozas V. Grazulevicius, Valentas Gaidelis, Vygintas Jankauskas, Zbigniew Tokarski, Nusrallah Jubran, Kam W. Law
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Publication number: 20080233500Abstract: A photoreceptor device having at least one layer that is a self-assembled patterned binder layer, which may include at least one functional material.Type: ApplicationFiled: March 23, 2007Publication date: September 25, 2008Applicant: XEROX CORPORATIONInventors: Kathy L. DE JONG, Hany AZIZ
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Patent number: 7427460Abstract: Improved organophotoreceptor comprises an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising: (a) a charge transport material having the formula where Ar is an aryl group; X comprises a bond or a linking group; R1, R2, and R3 each comprise H, a carboxyl, an amino group, a halogen, an alkyl group, an acyl group, an alkoxy group, an alkylsulfanyl group, an alkenyl group, an alkynyl group, a heterocyclic group, an aromatic group, or a part of a ring group; R4 comprises H, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, or a heterocyclic group; and R5, R6, R7, and R8 each comprise an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, a heterocyclic group, or a part of a ring group; and (b) a charge generating compound. Corresponding electrophotographic apparatuses and imaging methods are described.Type: GrantFiled: July 30, 2004Date of Patent: September 23, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Ruta Budreckiene, Gintaras Buika, Vygintas Jankauskas, Juozas V. Grazulevicius, Jonas Sidaravicius, Nusrallah Jubran, Zbigniew Tokarski
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Patent number: 7416825Abstract: The present invention provides a single layer type electrophotographic photoconductor which exhibits the small number of generated black spots in a formed image and exhibits the excellent sensitivity characteristic even when the photoconductor is used for a long time or a photoconductor drum is rotated at a high speed and an image display device which includes the single layer type electrophotographic photoconductor. In the single layer type electrophotographic photoconductor which includes a photoconductive layer containing a binding resin, a hole transporting agent and an charge generating agent, the photoconductor contains a water-repellant polycarbonate resin as the binding resin, and a contact angle of pure water (measured temperature: 25° C.) with respect to the photoconductive layer is set to 100° or more.Type: GrantFiled: January 4, 2006Date of Patent: August 26, 2008Assignee: Kyocera Mita CorporationInventors: Daisuke Kuboshima, Kazunari Hamasaki, Norio Nakai
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Publication number: 20080199796Abstract: The present invention provides an electrophotographic photoreceptor having excellent lubricity and abrasion resistance by using a novel polycarbonate resin comprising structural units having a polysiloxane chain in the shape of grafts as represented by the following general formula (1) with a viscosity-average molecular weight of 12,000 to 100,000 as a binder resin for a charge transport layer of a electrophotographic photoreceptor. wherein R1 to R5 each independently represents hydrogen, fluorine, chlorine, bromine, iodine, an alkyl group, an aryl group, an alkoxy group or an aralkyl group. R6 represents an alkylene group. Y represents a polysiloxane chain.Type: ApplicationFiled: February 13, 2008Publication date: August 21, 2008Inventors: Masahiko Minemura, Noriyoshi Ogawa
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Publication number: 20080187850Abstract: Disclosed herein is an electrophotographic imaging member comprising a supporting substrate and a charge generating layer. The charge generating layer comprises a binder, a first pigment having a first photosensitivity, and a second pigment having a second photosensitivity that is at least 2% greater than the photosensitivity of the first pigment. The first pigment has the same chemical formula, visible spectrum and crystalline structure as the second pigment. An electrostatographic apparatus including the electrophotographic imaging member also is disclosed.Type: ApplicationFiled: February 6, 2007Publication date: August 7, 2008Inventors: Lanhui Zhang, Cindy C. Chen
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Publication number: 20080171275Abstract: 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: ApplicationFiled: March 19, 2008Publication date: July 17, 2008Applicant: XEROX CORPORATIONInventors: Timothy P. Bender, John Graham, James M. Duff
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Publication number: 20080153020Abstract: The present invention provides an electrophotographic photoconductive member comprising a substrate, and a photoconductive layer containing a hole transferring material, a charge generating material and a binder resin, wherein a value (IV/OV value) in which the inorganic value is divided by the organic value of the binder resin is 0.Type: ApplicationFiled: December 19, 2007Publication date: June 26, 2008Applicant: Kyocera Mita CorporationInventors: Kazunari Hamasaki, Shiho Kuboshima, Daisuke Kuboshima, Yuko Iwashita
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Patent number: 7384718Abstract: A composition that finds particular utility in forming a charge generating layer of an imaging member includes at least one charge generating material, at least one polymer binder and at least one oxidized polyolefin polymer or copolymer. The oxidized polyolefin is able to impart a thixotropic rheology to the composition, and also is able to act as an anti-settling and anti-sagging agent in the composition.Type: GrantFiled: August 30, 2005Date of Patent: June 10, 2008Assignee: Xerox CorporationInventors: Jin Wu, John J. Wilbert, Linda L. Ferrarese, Liang-bih Lin
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Publication number: 20080090162Abstract: A binder resin composition which can sharply, but reversibly, melt and solidify within a narrow temperature range, a toner composition of enhanced low-temperature fixability and durability having the binder resin composition, and a preparation method thereof. The binder resin composition of the toner includes a first polymer compound having a proton donor site in a main chain, and a second polymer compound having a proton acceptor site in a main chain.Type: ApplicationFiled: March 20, 2007Publication date: April 17, 2008Applicant: Samsung Electronics Co., Ltd.Inventor: Koichi Tsunemi
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Patent number: 7354685Abstract: A photoconductive member comprised of a hole blocking layer, a photogenerating layer, and a charge transport layer comprised of a polymer with a low dielectric constant and a charge transport component.Type: GrantFiled: January 26, 2005Date of Patent: April 8, 2008Assignee: Xerox CorporationInventors: Jin Wu, Liang-Bih Lin, James M. Duff, Timothy P. Bender
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Publication number: 20080081274Abstract: An image recording material which has a support and an image recording layer containing a crystalline polymer and an amorphous polymer on at least one surface of the support, wherein the image recording layer has a storage elastic modulus G? at 100° C. of 1×102 Pa to 1×105 Pa during a temperature increase at 5° C./min, a storage elastic modulus G? at 60° C. of 1×106 Pa or more during a temperature decrease at 5° C./min and a temperature difference of 18° C. or less between a temperature at which the storage elastic modulus G? during a temperature increase at 5° C./min reaches 1×105 Pa and a temperature at which the storage elastic modules G? during a temperature decrease at 5° C./min reaches 1×105 Pa, upon measurement of viscoelasticity by using a rheometer of plate-to-plate distance: 1.5 mm, diameter: 20 mm.Type: ApplicationFiled: September 19, 2007Publication date: April 3, 2008Applicant: FUJIFILM CorporationInventors: Yasutomo GOTO, Ashita MURAI, Shinji FUJIMOTO, Yoshio TANI
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Patent number: 7348113Abstract: A polycarbonate resin has a constitutional unit expressed by the following general formula (I): A1 represents an alkyl group which is substitutional or nonsubstitutional, and an aryl group which is substitutional or nonsubstitutional. A2, A3, A4, A5, A6 and A7 each represent one of a hydrogen atom, a halogen atom, an alkyl group which has 1 to 6 carbon atoms and is substitutional or nonsubstitutional.Type: GrantFiled: September 10, 2004Date of Patent: March 25, 2008Assignee: Ricoh Company, Ltd.Inventors: Masayuki Shoshi, Yuko Komai, Hiroshi Tamura, Masaomi Sasaki
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Patent number: 7348112Abstract: Improved organophotoreceptor comprises an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising: (a) a polymeric charge transport material having the formula where n is a distribution of integers between 1 and 100,000 with an average value of greater than one; Y comprises an aromatic group; X1 and X2, each independently, is a bond or a linking group; Q1 and Q2 are, each independently, O, S, or NR; and R, R1, and R2 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an acyl group, a heterocyclic group, or an aromatic group; and (b) a charge generating compound. Corresponding electrophotographic apparatuses, imaging methods, and methods of preparing the polymeric charge transport material are described.Type: GrantFiled: July 1, 2004Date of Patent: March 25, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Nusrallah Jubran, Zbigniew Tokarski, Valentas Gaidelis, Vytautas Getautis, Tadas Malinauskas, Edmundas Montrimas, Kam W. Law
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Publication number: 20080057424Abstract: 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: ApplicationFiled: August 31, 2006Publication date: March 6, 2008Inventors: Yuhua Tong, Cindy C. Chen, Susan M. VanDusen
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Publication number: 20080050665Abstract: Imaging members useful in electrostatographic apparatuses, including printers, copiers, other reproductive devices, and digital apparatuses. More particularly, imaging members having a binder of high molecular weight that is included in one or more layers of an imaging member to impart coating consistency and to provide for increased mechanical strength and improved wear.Type: ApplicationFiled: August 23, 2006Publication date: February 28, 2008Applicant: Xerox CorporationInventors: Donald J. Goodman, Satish Parikh, Edward F. Grabowski, Kathleen M. Carmichael, David M. Skinner
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Patent number: 7323232Abstract: To provide a resin composition for spacer useful for the formation of a pixel-patterned spacer on a substrate in a liquid crystal display device, a spacer using the composition, and a liquid crystal display device that can display high-quality images, a resin composition for spacer contains at least one resin selected from (1) an allyl-containing resin, (2) an allyl-and-hydroxyl-containing resin, and (3) a resin mixture of an allyl-containing resin and a hydroxyl-containing resin.Type: GrantFiled: October 30, 2003Date of Patent: January 29, 2008Assignee: FUJIFILM CorporationInventors: Akihiko Takeda, Yoshio Sakakibara
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Publication number: 20080013987Abstract: A toner for electrostatic image development comprising a binder resin and a colorant, the toner having a content of an aluminum element with respect to carbon of approximately 0.005 atm % to approximately 0.02 atm % as measured by X-ray photo-electron spectroscopy.Type: ApplicationFiled: February 8, 2007Publication date: January 17, 2008Applicant: FUJI XEROX CO., LTD.Inventors: Takeshi Shoji, Hiroshi Nakazawa, Masanobu Ninomiya, Shuji Sato, Eisuke Iwazaki
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Publication number: 20080014519Abstract: An organic photoreceptor and an electrophotographic image forming apparatus including the organic photoreceptor are provided. The organic photoreceptor has the same advantage as a conventional laminated photoreceptor but improved electric properties such as higher photosensitivity and lower exposure potential.Type: ApplicationFiled: November 30, 2006Publication date: January 17, 2008Inventors: Ji-young Lee, Beom-jun Kim
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Patent number: 7314694Abstract: An imaging member comprised of a hole blocking layer, a photogenerating layer, and a charge transport layer, and wherein the hole blocking layer is comprised of a metal alkyoxide, an amino siloxane, and at least one polymer binder containing epoxy groups.Type: GrantFiled: March 31, 2005Date of Patent: January 1, 2008Assignee: Xerox CorporationInventors: Yuhua Tong, Nancy L. Belknap, John F. Yanus, Jin Wu
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Publication number: 20070298340Abstract: Imaging members useful in electrostatographic apparatuses, including printers, copiers, other reproductive devices, and digital apparatuses. More particularly, imaging members having nano-sized particles serving as fillers dispersed or contained in one or more layers of the imaging member that provide for increased mechanical strength and improved wear.Type: ApplicationFiled: June 22, 2006Publication date: December 27, 2007Applicant: Xerox CorporationInventors: Satchidanand Mishra, Yuhua Tong, Kathleen Carmichael, Chieh-Min Cheng, Kenny-tuan Dinh, Susan Vandusen, Cindy Chen, Huoy-Jen Yuh, Lanhui Zhang
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Patent number: 7309552Abstract: To provide a highly sensitive and highly durable electrophotographic photoconductor, electrophotography, photographic apparatus and process cartridge for the electrophotographic apparatus which is practical for a high-speed copying machine as well as for a laser printer. The electrophotographic photoconductor includes a photoconductive layer on a conductive support, in which the photoconductive layer contains an azo compound expressed by Formula (1) and wherein at least one of “Cp1” and “Cp2” contains a coupler residue selected from Formula (2), Formula (3) and Formula (4).Type: GrantFiled: September 17, 2004Date of Patent: December 18, 2007Assignee: Ricoh Company, Ltd.Inventors: Yuko Arizumi, Masayuki Shoshi
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Patent number: 7291433Abstract: An improved organophotoreceptor comprises an electrically conductive substrate and a photoconductive element on the electrically conductive substrate, the photoconductive element comprising: (a) a charge transport material comprising a polymer having the formula where X1 and X2 are, each independently, a bond or a linking group; Y comprises a bond or an arylamine group; Z comprises a bond, O, S, or NR4; R1 and R4 comprise, each independently, H, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, or a heterocyclic group; R2 and R3 comprise, each independently, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, or a heterocyclic group; and n is a distribution of integers between 1 and 100,000 with an average value of greater than one; and (b) a charge generating compound. Corresponding electrophotographic apparatuses, imaging methods, and methods of forming the charge transport material are described.Type: GrantFiled: March 31, 2004Date of Patent: November 6, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Nusrallah Jubran, Zbigniew Tokarski, Vytautas Getautis, Juozas Vidas Grazulevicius, Ingrida Paulauskaitÿ, Jose Antonio Reina Lozano, Valentas Gaidelis, Vygintas Jankauskas
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Patent number: 7270927Abstract: A non-halogenated binder material, such as for an electrophotographic imaging member binder, includes a copolymer of vinyl acetate and vinyl acid.Type: GrantFiled: November 15, 2004Date of Patent: September 18, 2007Assignee: Xerox CorporationInventors: Jin Wu, Francisco Lopez, Lanhui Zhang, Yuhua Tong, Liang-bih Lin, John S Chambers, Cindy Chen
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Patent number: 7267917Abstract: A charge transport layer composition for a photoreceptor includes at least a binder, at least one arylamine charge transport material, e.g., N,N?-diphenyl-N,N?-bis(3-methylphenyl)-(1,1?-biphenyl)-4,4?-diamine, and at least one polymer containing carboxylic acid groups or groups capable of forming carboxylic acid groups. The charge transport layer forms a layer of photoreceptor, which also includes an optional anti-curl layer, a substrate, an optional hole blocking layer, an optional adhesive layer, a charge generating layer, and optionally one or more overcoat or protective layers.Type: GrantFiled: September 21, 2004Date of Patent: September 11, 2007Assignee: Xerox CorporationInventors: Yuhua Tong, Kenny-Tuan T. Dinh, Markus R. Silvestri, Michael E. Zak, John F. Yanus, Min-Hong Fu, David M. Skinner, Kathleen M. Carmichael, Colleen A. Helbig, Dale S. Renfer, John A. Bergfjord, Sr., Susan M. Van Dusen, Anthony M. Horgan, Jin Wu, Steven M. Sterling
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Patent number: 7244535Abstract: An electrophotographic photoreceptor including an electroconductive substrate and a photosensitive layer formed thereon, the photosensitive layer containing a polyester resin which is a copolymerized polyester resin having at least two different types of repeating ester structure (A) each comprising a bivalent phenol residue represented by invention formula (1) and an aromatic dicarboxylic acid residue represented by invention formula (3), and a repeating ester structure (B) comprising a bivalent phenol residue represented by invention formula (2) and an aromatic dicarboxylic acid residue represented by invention formula (3):Type: GrantFiled: November 29, 2005Date of Patent: July 17, 2007Assignee: Mitsubishi Chemical CorporationInventor: Yuuta Kumano
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Patent number: 7229732Abstract: A composition comprised of a charge transport compound and a crosslinked polymer composition generated from the curing of a solution of a hydroxyl pendant polycarbonate, a hydroxylated charge transport compound, a curing agent and a solvent.Type: GrantFiled: August 4, 2004Date of Patent: June 12, 2007Assignee: Xerox CorporationInventors: Nan-Xing Hu, Timothy P. Bender, Ah-Mee Hor, H Bruce Goodbrand, Yvan Gagnon, George Liebermann
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Patent number: 7217483Abstract: The present invention provides an electrophotographic photoreceptor which has high light resistance, has high durability in exposure to oxidizing gases such as ozone and NOx, is excellent in mechanical properties such as printing durability, wearing resistance, marring resistance, and slip properties in repetitions of use, and further has excellent electrical properties. Specifically, the present invention provides an electrophotographic photoreceptor having an electroconductive substrate and provided thereon at least a photosensitive layer having a charge generation material, a charge transport material, and a binder resin.Type: GrantFiled: June 13, 2005Date of Patent: May 15, 2007Assignee: Mitsubishi Chemical CorporationInventors: Mamoru Nozomi, Kazutaka Ida, Mitsuo Wada
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Patent number: 7186490Abstract: A titanyl phthalocyanine crystal having an X-ray diffraction spectrum having a plurality of diffraction peaks in which a maximum diffraction peak is observed at a Bragg (2 ?) angle of 27.2°±0.2° and a diffraction peak is observed at a lowest Bragg (2?) angle of 7.3°±0.2° when a specific X-ray of Cu—K? having a wavelength of 1.514 ? irradiates the titanyl phthalocyanine crystal. A photoreceptor having a photosensitive layer including the titanyl phthalocyanine crystal is also provided.Type: GrantFiled: May 8, 2000Date of Patent: March 6, 2007Assignee: Ricoh Company, Ltd.Inventors: Tatsuya Niimi, Tetsuro Suzuki
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Electrophotographic photoreceptor, electrophotographic process cartridge and image forming apparatus
Patent number: 7175955Abstract: An electrophotographic photoreceptor comprising a conductive substrate, and at least one layer, which contains a polymeric compound having a repeating unit selected from repeating units represented by the following general formulas (I) to (III), provided on the conductive substrate, as well as an electrophotographic process cartridge and an image forming apparatus using the electrophotographic photoreceptor. In general formulas (I) to (III), R1a and R1b each independently represent an alkylene group, X represents an arylene group or an alkylene group, Y represents a divalent aromatic group, and n represents a repeating unit number.Type: GrantFiled: December 29, 2003Date of Patent: February 13, 2007Assignee: Fuji Xerox Co., Ltd.Inventors: Kenji Yao, Masahiro Iwasaki, Katsumi Nukada -
Patent number: 7166400Abstract: An organophotoreceptor comprises an electrically conductive substrate and photoconductive element on the electrically conductive substrate, the photoconductive element having a) a charge transport material with the formula ?where X is a linking group having the formula —(CH2)m—, branched or linear, where m is an integer between 0 and 20, inclusive, and one or more of the methylene groups is optionally replaced by O, S, C?O, O?S?O, a heterocyclic group, an aromatic group, urethane, urea, an ester group, a NR3 group, a CHR4 group, or a CR5R6 group where R3, R4, R5, and R6 are, independently, H, hydroxyl group, thiol group, an alkyl group, an alkaryl group, a heterocyclic group, or an aryl group; R1 and R2 are independently a hydrogen, a halogen, an alkyl group, an aryl group, an alkaryl group, an aromatic group or a heterocyclic group; Y is an aromatic group; and n is a distribution of integer values greater than 2; and (b) a charge generating compound.Type: GrantFiled: October 28, 2003Date of Patent: January 23, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Zbigniew Tokarski, Nusrallah Jubran, Kam W. Law
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Patent number: 7160658Abstract: An electrophotographic photoreceptor in which at least a photosensitive layer is provided above an electroconductive substrate, the outermost surface layer of the electroconductive substrate contains at least an inorganic filler, a binder resin, and an aliphatic polyester, or, alternatively, the outermost surface layer of the electroconductive substrate contains at least an inorganic filler and a binder resin and the binder resin is a copolymer polyarylate having an alkylene-arylcarboxylate structural unit, also an image forming method, image forming apparatus, and image forming apparatus processing unit in which the electrophotographic photoreceptor is used.Type: GrantFiled: March 4, 2005Date of Patent: January 9, 2007Assignee: Ricoh Company, Ltd.Inventors: Tetsuro Suzuki, Kazukiyo Nagai, Nozomu Tamoto, Eiji Kurimoto, Hidetoshi Kami
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Patent number: 7135261Abstract: A multi-layered organic electrophotographic photoconductor exhibits superior stability in mass production and excellent adhesion ability with two layers contacting the charge generation layer and is free of contamination of the coating liquid for a charge transport layer during a dip-coating process due to dissolution of the charge generation layer. The multi-layered organic electrophotographic photoconductor includes a conductive substrate and layers including an undercoat layer containing a thermosetting resin, a charge generation layer containing a charge generation material and an organic binder resin, and a charge transport layer laminated sequentially on the substrate, wherein polydispersity defined by a ratio of a weight average molecular weight to a number average molecular weight of the organic binder resin is at least 4.0, and the weight average molecular weight is at least 7.0×104 in a distribution of a polystyrene-converted molecular weight obtained by gel permeation chromatography.Type: GrantFiled: August 22, 2003Date of Patent: November 14, 2006Assignee: Fuji Electric Imaging Device Co., Ltd.Inventor: Mikio Yamazaki
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Patent number: 7094511Abstract: The present invention relates to an electrophotographic photoreceptor comprising a conductive support having formed thereon a specific photosensitive layer. The photosensitive layer comprises a siloxane resin-containing layer containing a siloxane resin having a structural unit represented by general formula (1) shown below, a structural unit represented by general formula (2) shown below, and an organic group derived from a compound having hole transport capability, or comprises a siloxane resin-containing layer containing a siloxane resin obtained by using an organic silicon compound having a structural unit represented by general formula (1) shown below and a hydrolytic group, and a compound represented by general formula (3) shown below: The formulas are defined in the specification.Type: GrantFiled: September 25, 2003Date of Patent: August 22, 2006Assignee: Fuji Xerox Co., Ltd.Inventors: Wataru Yamada, Katsumi Nukada, Kazuhiro Koseki, Masahiro Iwasaki, Takayuki Yamashita
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Patent number: 7090952Abstract: The present invention provides an electrophotosensitive material comprising a conductive substrate and a photosensitive layer provided on the conductive substrate, wherein the photosensitive layer contains a polyarylate having a repeating unit represented by the general formula (1): wherein X represents a phenylene group, a naphthylene group, or a biphenylene group, as a binder resin. The polyarylate is contained in the amount of 30% by weight or more based on the entire binder resin. The electrophotosensitive material of the present invention have improved wear resistance and gas resistance while reconciling both characteristics, and thus longer life has been achieved.Type: GrantFiled: November 12, 2003Date of Patent: August 15, 2006Assignee: Kyocera Mita CorporationInventors: Jun Azuma, Yukimasa Watanabe, Ayako Yashima
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Patent number: 7083883Abstract: A polymer has stilbenquinone structures as a repetitive unit and an electrophotographic photoreceptor containing the polymer. More particularly, the polymer has an improved electro-transporting capacity in that precipitation does not occur even when the polymer is used as an electron transporter for an electrophotographic photoreceptor in a high concentration.Type: GrantFiled: October 20, 2003Date of Patent: August 1, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Beom-Jun Kim, Saburo Yokota, Kyung-yol Yon, Hwan-koo Lee
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Patent number: 7074534Abstract: The present invention relates to polymeric charge transport compositions. The invention further relates to electronic devices in which there is at least one active layer comprising such charge transport compositions.Type: GrantFiled: July 2, 2003Date of Patent: July 11, 2006Assignee: E. I. du Pont de Nemours and CompanyInventors: Norman Herron, Nora Sabina Radu, Eric Maurice Smith
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Patent number: 7045321Abstract: A polyhydroxyalkanoate characterized by having in the molecule a unit represented by Chemical Formula (1): wherein n may assume any one integral value within the range of from 1 to 8. Also disclosed are a process for producing the polyhydroxyalkanoate by the use of a microorganism having the ability to produce the polyhydroxyalkanoate and accumulate it in the bacterial body; a charge control agent, a toner binder and a toner which contain this polyhydroxyalkanoate; and an image-forming method and an image-forming apparatus which make use of the toner.Type: GrantFiled: February 28, 2002Date of Patent: May 16, 2006Assignee: Canon Kabushiki KaishaInventors: Takeshi Imamura, Etsuko Sugawa, Tetsuya Yano, Tsuyoshi Nomoto, Tomohiro Suzuki, Tsutomu Honma, Takashi Kenmoku, Tatsuki Fukui
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Patent number: 7045264Abstract: A single layered electrophotographic photoreceptor includes a photosensitive layer having at least a charge generating material, a hole transporting material, an electron transporting material, and a binder on a conductive support. The photosensitive layer includes a peculiar charge transfer complex (CT-complex) formed by the hole transporting material and the electron transporting material.Type: GrantFiled: June 4, 2003Date of Patent: May 16, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Saburo Yokota, Hwan-koo Lee, Kyung-yol Yon, Beom-jun Kim, Nam-jeong Lee
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Patent number: 7037631Abstract: A photoconductive imaging member including a supporting substrate, a hole blocking layer thereover, a crosslinked photogenerating layer and a charge transport layer, and wherein the photogenerating layer includes a photogenerating component and a vinyl chloride, allyl glycidyl ether, hydroxy containing polymer.Type: GrantFiled: February 19, 2003Date of Patent: May 2, 2006Assignee: Xerox CorporationInventors: Jin Wu, Liang-Bih Lin, John S. Chambers
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Patent number: 7029811Abstract: An electrophotographic photoreceptor is disclosed which includes a conductive resin substrate and a resin layer. The resin layer includes a binding resin and is formed on the conductive resin substrate. The difference between the solubility parameter of the conductive resin substrate and the solubility parameter of the resin layer of the photoreceptor is 2.5 (J/cm3)1/2 or less.Type: GrantFiled: December 30, 2002Date of Patent: April 18, 2006Assignee: Kyocera Mita CorporationInventors: Jun Azuma, Eiichi Miyamoto
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Patent number: 7029812Abstract: This invention relates to a novel organophotoreceptor that comprises an electrically conductive substrate and photoconductive element on the electrically conductive substrate, the photoconductive element having a) a novel charge transport compound having the formula where X is a divalent hydrocarbon group of 1 to 30 carbon atoms, or a divalent hydrocarbon group of 1 to 30 carbon atoms where there is at least one substitution of a carbon atom by a heteroatom provided that no two heteroatoms may be adjacent within the backbone of an aliphatic divalent hydrocarbon radical, R1 is an aryl group or a heterocyclic group, R2 is a (N,N-disubstituted)arylamine group, and R3 is an epoxy group; and (b) a charge generating compound. The epoxy group can be reacted with a functional group within the polymer to form a polymeric charge transport compound either directly or through a crosslinking agent.Type: GrantFiled: August 5, 2003Date of Patent: April 18, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Zbigniew Tokarski, Nusrallah Jubran, Kam W. Law, Vytautas Getautis, Jonas V. Sidaravicius, Maryte Daskeviciene, Vygintas Jankauskas, Edmundas Montrimas, Valentas Gaidelis, Albina Stanisauskaite
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Patent number: 7022446Abstract: An electrophotographic photosensitive member having a surface layer containing at least one of a charge-transporting material and conductive particles and a polymer obtained by polymerizing at least one selected from the group consisting of a polyhydroxymethylbisphenol monomer having a specific structure, a polyhydroxymethylbisphenol oligomer having a specific structure, a polyhydroxymethyltrisphenol monomer having a specific structure and a polyhydroxymethyltrisphenol oligomer having a specific structure; and a process cartridge and an electrophotographic apparatus which have the electrophotographic photosensitive member.Type: GrantFiled: July 11, 2003Date of Patent: April 4, 2006Inventors: Kimihiro Yoshimura, Yosuke Morikawa, Tatsuya Ikezue, Kouichi Nakata, Daisuke Tanaka
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Patent number: 7012123Abstract: An acrylic polymer suitable for use as a charge transport material, the acrylic polymer containing pendant ?-conjugated groups represented by the following general formula (1) and having a triad syndiotacticity or triad isotacticity of at least 60%: wherein in the formula (1), Ar represents an aromatic group, R1 represents hydrogen or a methyl group, R2 represents an organic group or none, R3 and R4 both represent hydrogen or at least one of them represents an electron-donating or electron-withdrawing group, and n denotes an integer of 2 or larger.Type: GrantFiled: April 24, 2003Date of Patent: March 14, 2006Assignee: Sekisvi Chemical Co., Ltd.Inventors: Hideaki Ishizawa, Tamaki Nakano
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Patent number: 7010245Abstract: A multiple number of image forming stations are provided for multiple development colors including black. Each station having a photoreceptor. Each one of the photoreceptors has a charge transport layer including a binder resin that is a blend of at least two kinds of resins. The blended ration of at least two kinds of binder resins for the photoreceptor for black is made different from that of the binder resins for the photoreceptors for the other development colors. The photoreceptor for black presents a greater abrasion resistance than the photoreceptors for the other development colors. This structure makes it possible to use all the photoreceptors for back and colors, for and within, a concurrent period.Type: GrantFiled: April 17, 2003Date of Patent: March 7, 2006Assignee: Sharp Kabushiki KaishaInventors: Yuriko Shindoh, Kazushige Morita, Hiroko Ishibashi, Yoshihide Shimoda, Masanori Matsumoto
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Patent number: 6998210Abstract: The present invention relates to an electrophotographic photosensitive member comprising a surface layer excellent in adhesiveness and abrasion resistance, having a hardness and a toughness, and not degrading the charge transport property. One aspect of the present invention provides an electrophotographic photosensitive member comprising a photosensitive layer on a conductive support, wherein a surface layer of the photosensitive member contains a crosslinked epoxy-modified resol type phenolic resin, and at least one of a charge transport material and a conductive fine particle.Type: GrantFiled: November 18, 2003Date of Patent: February 14, 2006Assignee: Canon Kabushiki KaishaInventors: Kimihiro Yoshimura, Yosuke Morikawa, Tatsuya Ikezue, Kouichi Nakata, Daisuke Tanaka
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Patent number: 6991881Abstract: The present invention relates to an electrophotographic photosensitive member having a support and provided thereon a photosensitive layer. The photosensitive layer contains a high-molecular weight charge-transporting material having a specific repeating structural unit. The high-molecular weight charge-transporting material has a weight-average molecular weight Mw of 1,500 or more and an energy level of highest occupied molecular orbital, EHOMO, of from ?8.3 eV or more to ?8.0 eV or less as found by semiempirical molecular-orbital calculation. The present invention also relates to a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member.Type: GrantFiled: April 25, 2003Date of Patent: January 31, 2006Assignee: Canon Kabushiki KaishaInventors: Harunobu Ogaki, Akira Yoshida, Takakazu Tanaka, Itaru Takaya, Yuka Ishiduka
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Patent number: 6974654Abstract: 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: December 16, 2003Date of Patent: December 13, 2005Assignee: Ricoh Company, Ltd.Inventors: Shinichi Kawamura, Kazukiyo Nagai, Tomoyuki Shimada, Chiaki Tanaka, Michihiko Namba
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Patent number: 6936679Abstract: A charge-transporting polymer is represented by the following general formula (I-1) or (I-2): wherein A represents a group represented by the following general formula (II-1):Type: GrantFiled: September 10, 2002Date of Patent: August 30, 2005Assignee: Fuji Xerox Co., Ltd.Inventors: Mieko Seki, Hirohito Yoneyama, Daisuke Okuda, Hidekazu Hirose, Tadayoshi Ozaki, Takeshi Agata, Toru Ishii, Kiyokazu Mashimo, Katsuhiro Sato