Binder For Radiation-conductive Composition Patents (Class 430/96)
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Patent number: 12078961Abstract: A toner includes a crystalline polyester resin and an amorphous polyester resin. A ratio of the storage modulus of the toner G? (To) at a temperature To to the storage modulus of the toner G? (To+3) at a temperature To+3 is greater than or equal to 10, in a case where the temperature To is within a range from 50° C. to 65° C.Type: GrantFiled: August 20, 2021Date of Patent: September 3, 2024Assignee: Ricoh Company, Ltd.Inventors: Yuka Mizoguchi, Hiroshi Yamashita, Junichi Watanabe, Tomomi Harashima
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Patent number: 11809130Abstract: A toner for developing an electrostatic charge image contains toner particles containing at least one binder resin; the Mg element in an amount such that in an x-ray fluorescence analysis of the toner, the net intensity of the peak for the Mg element is 0.10 kcps or more and 1.20 kcps or less; and at least one external additive including particles of at least one compound represented by formula (1), MTiO3??(1) where M represents at least one selected from the group consisting of Ca, Sr, and Ba.Type: GrantFiled: January 12, 2021Date of Patent: November 7, 2023Assignee: FUJIFILM Business Innovation Corp.Inventors: Shintaro Anno, Atsushi Sugawara, Yoshimasa Fujihara, Daisuke Noguchi, Satoshi Miura
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Patent number: 11714359Abstract: An electrophotographic photosensitive member includes: a conductive support; a charge generation layer disposed on the conductive support, the charge generation layer including a charge generating material and a vinyl copolymer, the vinyl copolymer including a structural unit including a chlorine atom, a structural unit including an acyloxy group, and a structural unit including an aromatic polycarboxylic acid structure, a proportion of the structural unit including a chlorine atom to all the structural units being 80% by mass or more, a proportion of the structural unit including an aromatic polycarboxylic acid structure to all the structural units being 0.5% by mass or more; and a charge transport layer disposed on the charge generation layer, the charge transport layer including a charge transporting material and a binder resin.Type: GrantFiled: August 18, 2021Date of Patent: August 1, 2023Assignee: FUJIFILM BUSINESS INNOVATION CORP.Inventor: Takaakira Sasaki
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Patent number: 11693330Abstract: A toner for developing an electrostatic charge image contains toner particles containing at least one binder resin; the Mg element in an amount such that the net intensity of x-ray fluorescence from the Mg element in the toner is 0.10 kcps or more and 1.20 kcps or less; and external additives including particles of at least one compound represented by formula (1) and particles of a metal salt of a fatty acid, MTiO3??(1) where M represents at least one selected from the group consisting of Ca, Sr, and Ba.Type: GrantFiled: January 14, 2021Date of Patent: July 4, 2023Assignee: FUJIFILM Business Innovation Corp.Inventors: Shintaro Anno, Yoshimasa Fujihara, Atsushi Sugawara, Daisuke Noguchi, Satoshi Miura
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Patent number: 11640120Abstract: An image forming apparatus includes an image bearing member, a charger, a light exposure device, a development device, a transfer belt, a primary transfer device, a secondary transfer device, and a cleaning member. The cleaning member is pressed against a circumferential surface of the image bearing member and collects residual toner remaining on the circumferential surface of the image bearing member as a result of primary transfer of a toner. The transfer belt has a surface resistivity of at least 6 Log ? and no greater than 11 Log ?. A linear pressure of the cleaning member on the circumferential surface of the image bearing member is at least 10 N/m and no greater than 40 N/m. The image bearing member includes a conductive substrate and a photosensitive layer of a single layer. The image bearing member satisfies formula (1): 0.06 ? V ( Q / S ) × ( d / ? r · ? 0 ) .Type: GrantFiled: July 16, 2019Date of Patent: May 2, 2023Assignee: KYOCERA Document Solutions Inc.Inventors: Teppei Shibuya, Masahito Ishino, Toshiki Fujita
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Patent number: 11346199Abstract: A fluid separating device comprises: a cylinder; a plurality of separators disposed around a cylinder; a first elastic piece disposed between one of the separators and the cylinder and applying an elastic force to the separator outwardly in the radial direction of the cylinder; a first guiding device passing through the cylinder axially and configured to reciprocate between an expanded position and a contracted position in the axial direction of the cylinder; a second guiding device penetrating the cylinder, connected to the separator at one end, and slidably fitted with the first guiding device at the other end via a fitting surface. The fluid separating device eliminates the friction between the separator and the inner wall of the wellhole when descending, therefore descending to the bottom of the well quickly.Type: GrantFiled: September 5, 2018Date of Patent: May 31, 2022Assignee: CHENGDU BISON TECHNOLOGY CO., LTD.Inventor: Shuhao Liu
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Patent number: 11188002Abstract: The present invention relates to an electrophotographic photoreceptor including a conductive support and a photosensitive layer on the conductive support, and the photosensitive layer contains a polymer A containing a repeating structural unit represented by a specific formula, and a polymer B containing a repeating structural unit represented by a specific formula. In addition, the present invention relates to an electrophotographic photoreceptor cartridge and an image forming apparatus including the electrophotographic photoreceptor.Type: GrantFiled: April 3, 2020Date of Patent: November 30, 2021Assignee: Mitsubishi Chemical CorporationInventors: Takahiro Choda, Atsushi Yoshizawa
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Patent number: 10884348Abstract: The present invention aims to provide an electrophotographic photoreceptor which is excellent in abrasion resistance against practical load and excellent in initial electrical properties, preferably further excellent in adhesion between layers by containing a polyester resin excellent in abrasion resistance, which is an electrophotographic photoreceptor containing a photosensitive layer and a conductive support, the electrophotographic photoreceptor containing a polyester resin having a specific structure ? with a number average molecular weight of 15,000 or less and containing a divalent phenol residue and a divalent carboxylic acid residue.Type: GrantFiled: March 20, 2019Date of Patent: January 5, 2021Assignee: Mitsubishi Chemical CorporationInventor: Atsushi Yoshizawa
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Patent number: 10429752Abstract: Provided is a positively charged electrophotographic photoconductor, a manufacturing method thereof, and an electrophotographic apparatus using the same. The positively charged electrophotographic photoconductor includes an electroconductive support and a single layer-type photosensitive layer provided thereon including a charge generation material, a hole transport material, an electron transport material, and a mixed binder resin. Alternately, the positively charged electrophotographic photoconductor includes an electroconductive support; a charge transport layer provided on the electroconductive support and containing at least a hole transport material, and a binder resin; and a charge generation layer provided on the charge transport layer and including at least a charge generation material, a hole transport material, an electron transport material, and a mixed binder resin.Type: GrantFiled: August 30, 2018Date of Patent: October 1, 2019Assignee: FUJI ELECTRIC CO., LTD.Inventors: Seizo Kitagawa, Toshiki Takeuchi, Kazuya Saito
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Patent number: 9778581Abstract: An electrophotographic photosensitive member includes a hole transporting layer containing a polyester resin having a structural unit expressed by formula (1) as a hole transporting substance.Type: GrantFiled: January 28, 2015Date of Patent: October 3, 2017Assignee: Canon Kabushiki KaishaInventors: Yota Ito, Takashi Anezaki, Daisuke Miura, Hirofumi Kumoi
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Patent number: 9703215Abstract: An electrophotographic photoreceptor is provided that can achieve reductions in the amount of wear in the photoreceptor surface while producing an excellent image on a long-term basis. Also provided are a method of producing the electrophotographic photoreceptor and an electrophotographic apparatus. The electrophotographic photoreceptor includes a conductive substrate; and a photosensitive layer provided on the conductive substrate and being composed of a resin having a molecular structure optimized using molecular dynamic calculations that is a helical structure, and having a value for a ratio r/I between the diameter (r) and helix pitch (I) of the helical structure that ranges from 0.04 to 1.0.Type: GrantFiled: February 11, 2016Date of Patent: July 11, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventors: Shinjiro Suzuki, Tomoki Hasegawa, Fengqiang Zhu
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Patent number: 9381504Abstract: A deodorizing material is a cured substance that is obtained by dissolving a photosensitizing colorant in an unsaturated polyester resin composition which contains unsaturated polyester and a monomer copolymerizable with the unsaturated polyester and which is in a liquid state at a room temperature, and by adding a curing agent to let the liquid cured. This deodorizing material changes from the base state to the singlet excitation state, and further to the triplet excitation state upon irradiation with light in a gas phase containing oxygen and odor components. This energy is given to the oxygen molecules to produce singlet oxygen. The oxidation action of the produced singlet oxygen decomposes the odor components.Type: GrantFiled: July 17, 2013Date of Patent: July 5, 2016Assignees: HIROSHIMA UNIVERSITY, YOKOTA TRADING CO., LTD.Inventors: Yoshikuni Masaoka, Masatake Tagawa, Toshihiko Ohara
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Patent number: 9268272Abstract: An endless heat-generation belt 10 includes a heat-generation layer 11 and a pair of metal electrodes 12 and 12. The heat-generation layer 11 is composed of an electroconductive resin composition and the heat-generation layer 11 can be heated by supplying electricity. The metal electrode 12 is bonded to the heat-generation layer 11 with an electroconductive adhesive 13. The electroconductive adhesive 13 contains an adhesive matrix and an electroconductive filler. The adhesive matrix is a modified silicone resin or an epoxy resin. The heat-generation belt 10 has excellent heat resistance, durability, and resistance stability, and it can be used for a fixing device of an image forming apparatus.Type: GrantFiled: September 11, 2013Date of Patent: February 23, 2016Assignee: KONICA MINOLTA, INC.Inventors: Izumi Mukoyama, Eiichi Yoshida, Susumu Sudo, Akira Ohira
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Patent number: 9141006Abstract: The presently disclosed embodiments are directed to charge transport layers useful in electrostatography. More particularly, the embodiments pertain to an electrostatographic imaging member having imaging layers that exhibit improved electrical performance. In these embodiments, both the charge generation layer and charge transport layer comprise a tetra-aryl polycarbonate copolymer.Type: GrantFiled: October 17, 2013Date of Patent: September 22, 2015Assignee: XEROX CORPORATIONInventor: Jin Wu
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Patent number: 9017908Abstract: The presently disclosed embodiments are directed to flexible imaging members used in electrophotographic imaging apparatuses. More particularly, the embodiments pertain to electrophotographic imaging members which have imaging layer(s) formulated to comprise of a novel polymer blended binder comprising a bisphenol type polycarbonate and an organic acid-containing copolyester doped into the polycarbonate which provides improved properties and performance to the resulting imaging member. The formulated imaging layer(s) may further include a plasticizer.Type: GrantFiled: August 20, 2013Date of Patent: April 28, 2015Assignee: Xerox CorporationInventors: Robert C. U. Yu, Stephen T. Avery, Jimmy E. Kelly, Mark Muscato, J. Robinson Cowdery-Corvan, David Skinner, Dennis J. Prosser
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Patent number: 8993203Abstract: An electrophotographic photoreceptor, an electrophotographic photoreceptor cartridge, and an image forming apparatus, which are excellent in electrical characteristics such as a responsivity and at the same time, excellent in the crack resistance, are provided. Two kinds of charge transport substances each having a specific structure and a polycarbonate resin having a specific structure are combined, whereby the electrical characteristics such as responsivity and the crack resistance can be improved at the same time.Type: GrantFiled: February 7, 2013Date of Patent: March 31, 2015Assignee: Mitsubishi Chemical CorporationInventor: Akiteru Fujii
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Publication number: 20150086914Abstract: Flexible imaging members in electrophotography which have an improved plasticized charge transport layer formulation. The resulting imaging member is resistant to chemical contaminants, photoelectrically stable, fatigue cracking suppression, and has a simplified material structure which is curl-free without the need of an anticurl back coating layer. Process for making and using the member are also disclosed.Type: ApplicationFiled: September 20, 2013Publication date: March 26, 2015Applicant: XEROX CORPORATIONInventor: ROBERT C.U. YU
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Patent number: 8921020Abstract: Provided is an electrophotographic photosensitive member, including: a support; and a photosensitive layer, which is provided on the support, in which: a surface layer of the electrophotographic photosensitive member includes a terminal siloxane-containing polyester resin having a specific structure; and a lower layer provided in contact with the surface layer includes a polycarbonate resin, a polyester resin, or a polyvinyl acetal resin, having a specific structure.Type: GrantFiled: October 25, 2011Date of Patent: December 30, 2014Assignee: Canon Kabushiki KaishaInventors: Shio Murai, Harunobu Ogaki, Kazunori Noguchi, Takashi Anezaki, Kazuhisa Shida, Atsushi Okuda
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Publication number: 20140377695Abstract: A member for electrophotography having a multilayer structure or a single-layer structure, including an outermost layer which satisfies the following A, B and C: A: the outermost layer has perfluoropolyether and a binder resin, and in the outermost layer, the ratio of the number of fluorine atoms to the number of carbon atoms is 0.10 or more and 0.40 or less; B: in a 19F-NMR spectrum of the outermost layer, the relaxation time T2 of a peak derived from CF2 moieties of perfluoropolyether is 13 milliseconds or more at 22° C.; and C: the total sum of the contents of CF3 moieties, CF2 moieties, and CF moieties in the binder resin is 5% by mass or less.Type: ApplicationFiled: June 24, 2014Publication date: December 25, 2014Inventors: Naoto Kameyama, Kenji Onuma, Rieko Sakamoto, Yasushi Shimizu, Koichi Sato, Kimihiro Yoshimura, Akira Watanabe, Maho Tanaka, Shigeki Takishita, Hiroshi Tominaga, Keiji Karube, Takenori Sueoka
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Patent number: 8906586Abstract: A coating fluid for photosensitive-layer formation having high productivity and stability and a process thereof are provided. Also provided are a high-performance electrophotographic photoreceptor and an image-forming apparatus which are capable of forming high-quality images even in various use environments and are less apt to cause image defects such as black spots or color spots. The objects are accomplished with a process for producing a coating fluid which is for forming a photosensitive layer of an electrophotographic photoreceptor and comprises a charge-generating material and a binder resin, wherein a dispersing medium having an average particle diameter in the range of from 1.0 ?m to 350 ?m is used as a dispersing medium for dispersing the charge-generating material in the coating fluid for photosensitive-layer formation. The coating fluid for photosensitive-layer formation produced by this process is preferable as a photosensitive layer of an electrophotographic photoreceptor.Type: GrantFiled: May 18, 2007Date of Patent: December 9, 2014Assignee: Mitsubishi Chemical CorporationInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroe Fuchigami
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Publication number: 20140356773Abstract: An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The hole transport material contains an amine stilbene derivative represented by a general formula (1), and the binder resin contains a polycarbonate resin represented by a general formula (2).Type: ApplicationFiled: May 28, 2014Publication date: December 4, 2014Applicant: KYOCERA DOCUMENTS SOLUTIONS, INC.Inventors: Jun AZUMA, Keiji MARUO, Kensuke OKAWA, Akihiko OGATA
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Publication number: 20140356772Abstract: A photoconductor that includes, for example, a supporting substrate, an optional ground plane layer, an optional hole blocking layer, an optional adhesive layer, a photogenerating layer, and a charge transport layer, and where the charge transport layer contains a mixture of a charge transport component and a bio-based polycarbonate.Type: ApplicationFiled: June 3, 2013Publication date: December 4, 2014Applicant: Xerox CorporationInventor: Jin Wu
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Publication number: 20140322637Abstract: In an electrophotographic photosensitive member including a charge-generating layer, the charge-generating layer has a matrix-domain structure; in the matrix-domain structure, the domain contains a charge-generating substance, and the matrix contains a binder resin and a fluoranthene compound.Type: ApplicationFiled: April 28, 2014Publication date: October 30, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Junpei Kuno, Takeshi Murakami, Tsutomu Nishida, Masataka Kawahara, Kaname Watariguchi
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Publication number: 20140315124Abstract: Provided are a method of producing an electrophotographic photosensitive member, particularly, a method of producing an electrophotographic photosensitive member and an organic device by which, in a method of forming a charge transporting layer, the stability of an application liquid for the layer after long-term storage is improved while the usage of an organic solvent in the application liquid is curtailed, and the layer having high uniformity is formed. The method is a method of producing an electrophotographic photosensitive member which includes a support and a charge transporting layer formed thereon, the method including: preparing a solution including: a first liquid whose solubility in water under 25° C. and 1 atmosphere is 1.0 mass % or less; a second liquid whose solubility in water under 25° C. and 1 atmosphere is 5.Type: ApplicationFiled: December 11, 2012Publication date: October 23, 2014Inventors: Atsushi Okuda, Keiko Yamagishi, Harunobu Ogaki, Yohei Miyauchi, Hiroki Uematsu, Kimihiro Yoshimura
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Patent number: 8865302Abstract: An electrophotographic recording medium can have a first layer of base material and a second layer formed on one or both surfaces of the first layer for fixing toner. The second layer can include a hollow pigment, an inorganic material and a binder resin. The amount of the hollow pigment can be in the range of about 10% to about 50% by weight based on the total weight of the second layer. The ratio of the white paper glossiness before and after printing on the recording medium may be greater than 1.5.Type: GrantFiled: October 27, 2009Date of Patent: October 21, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Chang-Woo Jung, Taek-Yong Jung
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Patent number: 8846281Abstract: An electrophotographic photosensitive member having a surface layer which contains a silicon-containing compound in an amount of less than 0.6% by mass based on the whole solid content in the surface layer, where the silicon-containing compound in the surface layer has a siloxane moiety in an amount of 0.01% by mass or more, based on the whole solid content in the surface layer, and its surface has specific depressions. Also disclosed are a process cartridge and an electrophotographic apparatus which have the electrophotographic photosensitive member.Type: GrantFiled: September 24, 2009Date of Patent: September 30, 2014Assignee: Canon Kabushiki KaishaInventors: Atsushi Okuda, Hirotoshi Uesugi, Kazunori Noguchi, Tsutomu Nishida
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Patent number: 8835085Abstract: Present embodiments relate generally to the flexible electrostatographic imaging members prepared to comprise a plasticized charge transport layer, plasticized ground strip layer, and a novel plasticized anti-curl back coating layer prepared to have internal stress/strain reduction, superb wear resistance property, and render the resulting flexible imaging members with absolute flatness to meet the functional requirement of electrostatographic imaging apparatuses. More particularly, the embodiments pertain to the reformulation of an anti-curl back coating layer comprising a novel high molecular weight film forming A-B diblock copolymer, a copolyester adhesion promoter, an organic or inorganic particles dispersion, and a plasticizer in the layer's material matrix.Type: GrantFiled: September 26, 2012Date of Patent: September 16, 2014Assignee: Xerox CorporationInventor: Robert C. U. Yu
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Patent number: 8828633Abstract: To obtain a toner which has excellent charge rise and stability, tends to have a sharp charge distribution, has excellent pigment dispersion properties, exhibits no disarray in an image even during a high-speed copying operation, and can stably output high-resolution images. A toner comprising toner particle containing a binder resin, a colorant, resin PA, and resin PB, wherein the resin PA has unit A represented by Formula (1), the resin PB has unit B represented by Formula (2), a content “a” of the unit A in the toner particle is 2.00 ?mol/g or more, and a molar ratio b/a of the content “a” and a content “b” of the unit B in the toner particle is 0.10 or more and 10.00 or less.Type: GrantFiled: December 20, 2010Date of Patent: September 9, 2014Assignee: Canon Kabushiki KaishaInventors: Hitoshi Itabashi, Takashi Kenmoku, Harumi Takada
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Patent number: 8790853Abstract: The present disclosure is directed to charge generating compositions and methods of making the charge generating compositions. The composition may comprise one or more polymers comprising styrene units and allyl alcohol units, and one or more photoconductive particles. Electrophotographic devices employing the compositions, including methods of making the devices, are also disclosed.Type: GrantFiled: March 1, 2006Date of Patent: July 29, 2014Assignee: Xerox CorporationInventors: Jin Wu, John J. Wilbert, Marc J. Livecchi, Liang-bih Lin
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Patent number: 8785089Abstract: The present invention provides an electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus, each of which has the electrophotographic photosensitive member. In the electrophotographic photosensitive member, a charge transport layer used as a surface layer contains a charge transport material, a polycarbonate resin A which has a specific amount of a specific repeating structural unit of a specific siloxane moiety, and a polyester resin C and/or a polycarbonate resin D, each of which has a specific repeating structural unit. In the charge transport layer, a matrix-domain structure is formed in which a matrix is formed from the charge transport material and the polyester resin C and/or the polycarbonate resin D, and domains are formed in the above matrix from the polycarbonate resin A.Type: GrantFiled: December 2, 2010Date of Patent: July 22, 2014Assignee: Canon Kabushiki KaishaInventors: Atsushi Okuda, Tsutomu Nishida
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Patent number: 8765339Abstract: The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital printing, apparatuses. More particularly, the embodiments pertain to an improved electrophotographic imaging member comprising a charge transport layer comprising a novel combination of a tetraaryl polycarbonate copolymer binder and perfluorinated fillers. The present charge transport layer provides reduced wear rate and long service life.Type: GrantFiled: August 31, 2012Date of Patent: July 1, 2014Assignee: Xerox CorporationInventors: Jin Wu, Kenny-Tuan T. Dinh, Lanhui Zhang, Lin Ma
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Patent number: 8728591Abstract: Disclosed is a polymer film excellent in performance of inducing Rth.Type: GrantFiled: June 20, 2012Date of Patent: May 20, 2014Assignee: FUJIFILM CorporationInventors: Hiroshi Inada, Ryo Nakamura, Masaki Noro
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Patent number: 8722289Abstract: It is to provide a sheet-shaped electrophotographic photoreceptor which has an uncoated area, is good in mechanical adhesiveness between the photosensitive layer and the sheet-shaped conductive substrate but excellent ease of peeling with a solvent, and is further good in electrical properties. The electrophotographic photoreceptor comprises a sheet-shaped conductive substrate and a photosensitive layer provided thereon, wherein the electrophotographic photoreceptor contains a photosensitive layer-uncoated area within the sheet surface, and the photosensitive layer contains a copolycarbonate resin having an extremely restricted specific structure.Type: GrantFiled: May 31, 2011Date of Patent: May 13, 2014Assignee: Mitsubishi Chemical CorporationInventor: Hiroaki Takamura
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Patent number: 8709690Abstract: A photoreceptor comprising an undercoat layer between a conductive support and a photosensitive layer, wherein the undercoat layer contains at least metal oxide microparticles coated with anhydrous silicon dioxide and a first binder resin, the photosensitive layer is a monolayered photosensitive layer containing at least a charge generation material and a charge transport material or a multilayered photosensitive layer formed of a charge generation layer containing a charge generation material and a charge transport layer containing a charge transport material stacked in this order or in an inverse order, and the charge generation material contains a crystal type oxotitanylphthalocyanine having peaks in an X-ray diffraction spectrum with Cu—K? characteristic X-rays (0.15418 nm) at Bragg angles (2?±0.2°) of 7.3°, 9.4°, 9.6°, 11.6°, 13.3°, 17.9°, 24.1° and 27.2°, in which a peak bundle formed by overlapping the peaks at 9.4° and 9.6° is a largest peak, and the peak at 27.Type: GrantFiled: July 22, 2010Date of Patent: April 29, 2014Assignee: Sharp Kabushiki KaishaInventors: Tomomi Nakamura, Satoshi Katayama
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Patent number: 8703371Abstract: A charge generating layer of an electrophotographic photosensitive member contains a charge generating substance, polyvinyl acetal, and a fluorenone derivative.Type: GrantFiled: October 31, 2011Date of Patent: April 22, 2014Assignee: Canon Kabushiki KaishaInventors: Wataru Kitamura, Kenichi Kaku, Mai Murakami
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Patent number: 8673523Abstract: An image holding member for an image forming apparatus includes: a substrate; and a photosensitive layer on the substrate, the photosensitive layer containing a compound including a partial structure represented by the following Formula (II-2) wherein in Formula (II-2), Ar represents a substituted or unsubstituted phenyl group, a substituted or unsubstituted monovalent polynuclear aromatic hydrocarbon group having from 2 to 10 aromatic rings, a substituted or unsubstituted monovalent condensed aromatic hydrocarbon group having from 2 to 10 aromatic rings, or a substituted or unsubstituted monovalent aromatic heterocyclic group; q represents 0 or 1; and n's each independently represent an integer of from 0 to 7.Type: GrantFiled: September 8, 2010Date of Patent: March 18, 2014Assignee: Fuji Xerox Co., Ltd.Inventors: Hidekazu Hirose, Takeshi Agata, Katsuhiro Sato
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Patent number: 8623578Abstract: A photoconductor that includes, for example, a supporting substrate, an optional ground plane layer, an optional hole blocking layer, an optional adhesive layer, a photogenerating layer, and a charge transport layer, and where the charge transport layer contains a mixture of a charge transport component and a tetraaryl polycarbonate.Type: GrantFiled: June 6, 2012Date of Patent: January 7, 2014Assignee: Xerox CorporationInventors: Jin Wu, Kenny-Tuan T Dinh, Than Sorn, Robert W Hedrick, Linda L Ferrarese, Marc J Livecchi, Lanhui Zhang, Lin Ma, Stanley J Pietrzykowski, Jr.
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Publication number: 20130337373Abstract: This invention relates to a polycarbonate copolymer having a structure formed of a repeating unit represented by the following formula (100): in which a molar copolymer composition represented by Ar1/(Ar1+Ar2) is in a range of 50 mol % to 67 mol %, a reduced viscosity [?sp/C] is in a range of 0.60 dl/g to 4.0 dl/g, and a ratio of a hydroxyl group in all ends is 20 mol % or less.Type: ApplicationFiled: February 21, 2012Publication date: December 19, 2013Applicant: Idemitsu Kosan Co., Ltd.Inventors: Kengo Hirata, Hironobu Morishita, Takaaki Hikosaka
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Patent number: 8603725Abstract: Flexographic printing precursors are prepared using laser-engraveable compositions containing a laser-engraveable resin and chemically-crosslinked organic porous particles. The presence of these porous particles, which can include an infrared radiation absorber, improves various imaging and performance properties in the preparation of flexographic printing members such as flexographic printing plates and printing sleeves.Type: GrantFiled: July 28, 2011Date of Patent: December 10, 2013Assignee: Eastman Kodak CompanyInventors: Christine Joanne Landry-Coltrain, Mridula Nair
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Patent number: 8597864Abstract: 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: GrantFiled: February 16, 2009Date of Patent: December 3, 2013Assignee: Fuji Electric Co., Ltd.Inventors: Shinjiro Suzuki, Yoichi Nakamura, Seizo Kitagawa, Fengqiang Zhu, Kazuki Nebashi
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Patent number: 8574799Abstract: This invention provides an electrophotographic photoreceptor having improved resistance to soiling by a human body-derived substance and a high image stability. The electrophotographic photoreceptor comprises an electroconductie substrate and a photosensitive layer provided on the substrate and is characterized in that the photosensitive layer contains, as a binder resin, a polycarbonate resin comprising constituent units represented by the following formula (A) and the following formula (B), wherein R1 to R4 represent a hydrogen atom, a methyl group or the like; and X represents an alkylene group or the like. 3 to 50% by weight of the total constituent units is accounted for by the constituent units of formula (A) and the intrinsic viscosity is 0.3 to 2 dl/g. [Chemical formula 1] (A)(B).Type: GrantFiled: May 16, 2007Date of Patent: November 5, 2013Assignee: Mitsubishi Gas Chemical Company, Inc.Inventor: Takahiro Adachi
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Patent number: 8518619Abstract: Provided is to provide a photoelectric conversion device including an organic compound layer which contains polymer (a) having partial structures represented by the following formulae (1) and (2) respectively. In the formula, R1, R2, R3 each independently represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, X and Y each independently represent a divalent organic group having from 1 to 20 carbon atoms, a represents 0 or 1, and CT represents an organic group having a charge transportable skeleton.Type: GrantFiled: February 11, 2011Date of Patent: August 27, 2013Assignee: Fuji Xerox Co., Ltd.Inventors: Katsumi Nukada, Wataru Yamada, Takatsugu Doi
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Publication number: 20130216942Abstract: A polycarbonate composition for an electrophotographic photoreceptor coating, wherein the polycarbonate includes 1 to 100 mole percent of first units of the formula and 0 to 99 mole percent of one or more second units of the formula and wherein the polycarbonate has a weight average molecular weight of at least 50,000 g/mole, and a polydispersity index of 1 to 5.Type: ApplicationFiled: February 17, 2012Publication date: August 22, 2013Inventors: Mohd Shamsul Hairi bin Mohd SALLEH, James Franklin HOOVER, Andries J.P. VAN ZYL, Robert Dirk VAN DE GRAMPEL, Jan-Pleun LENS
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Patent number: 8486592Abstract: A radiation-sensitive material comprising a support and a radiation sensitive composition on the support is disclosed, wherein the radiation sensitive composition includes a dispersion containing nanoparticles of a sensitizer.Type: GrantFiled: March 22, 2010Date of Patent: July 16, 2013Assignee: ISP Investments Inc.Inventors: Hsiao-Yi Shih, Guojin Lu, David F. Lewis, Xiang Yu
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Patent number: 8481238Abstract: An electrophotographic photoreceptor is provided which comprises a conductive substrate and a photosensitive layer formed thereover, wherein the photosensitive layer contains at least a polyarylate resin having a repeating structure represented by the following formula [1] and a compound represented by the following formula [6]. This photoreceptor has excellent abrasion resistance under practical load, has high mechanical strength, and further has highly excellent electrical properties.Type: GrantFiled: June 11, 2008Date of Patent: July 9, 2013Assignee: Mitsubishi Chemical CorporationInventors: Rui Zhao, Yuka Nagao, Teruyuki Mitsumori, Tadashi Mizushima, Shunichiro Kurihara, Takayuki Shoda
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Patent number: 8465889Abstract: To provide an electrophotographic photosensitive member that can reproduce good images with less positive ghost and also has a good photosensitivity, the electrophotographic photosensitive member is incorporated in its photosensitive layer with a copolymer having a repeating structural unit represented by the formula (1) and a repeating structural unit represented by the formula (2), or a copolymer having a repeating structural unit represented by the formula (1) and a repeating structural unit represented by the formula (3).Type: GrantFiled: January 29, 2010Date of Patent: June 18, 2013Assignee: Canon Kabushiki KaishaInventors: Kunihiko Sekido, Hideaki Nagasaka, Michiyo Sekiya, Shinji Takagi, Akihiro Maruyama
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Patent number: 8450035Abstract: Disclosed is an electrophotographic photosensitive body which is remarkably improved in pencil scratch resistance and wear resistance. Specifically disclosed is an electrophotographic photosensitive body wherein a polycarbonate resin having a structural unit (1) represented by the formula below is used as a binder resin for a photosensitive layer (or for a charge-transporting layer in case of multilayer type) which is formed on a conductive base. [chemical formula 1] (1) (In the formula, R1-R30 respectively represent a hydrogen atom or a substituent selected from the group consisting of fluorine, chlorine, bromine, iodine, an alkyl group having 1-17 carbon atoms, an aryl group having 6-12 carbon atoms, an alkoxy group having 1-5 carbon atoms, an alkenyl group having 2-12 carbon atoms and an aralkyl group having 7-17 carbon atoms.Type: GrantFiled: August 7, 2007Date of Patent: May 28, 2013Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Noriyoshi Ogawa, Toru Oikawa
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Patent number: 8435706Abstract: To provide an electrophotographic photosensitive member that can reproduce good images with less positive ghost and also has a good photosensitivity, the electrophotographic photosensitive member is incorporated in its photosensitive layer with a copolymer having a repeating structural unit represented by the formula (1) and a repeating structural unit represented by the formula (2), or a copolymer having a repeating structural unit represented by the formula (1) and a repeating structural unit represented by the formula (3).Type: GrantFiled: January 29, 2010Date of Patent: May 7, 2013Assignee: Canon Kabushiki KaishaInventors: Kunihiko Sekido, Hideaki Nagasaka, Michiyo Sekiya, Shinji Takagi, Akihiro Maruyama
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Patent number: 8404414Abstract: 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: GrantFiled: April 2, 2009Date of Patent: March 26, 2013Assignee: Fuji Electric Co., Ltd.Inventors: Ikuo Takaki, Yoichi Nakamura, Seizo Kitagawa, Kazuki Nebashi, Fengqiang Zhu
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Patent number: 8383306Abstract: The present disclosure provides an electrographic toner and methods for preparing an electrographic toner. In particular, the present disclosure provides an electrophotographic toner comprising a latex, a colorant and a releasing agent. The electrophotographic toner may further comprise zinc (Zn), iron (Fe), and silicon (Si). The [Zn]/[Fe] ratio may be in the range of about 5.0×10?2 to about 2.0. The [Si]/[Fe] ratio may be in the range of about 5.0×10?4 to about 5.0×10?2. [Zn], [Fe] and [Si] denote the intensities of Zn, Fe and Si, respectively, as measured by X-ray fluorescence spectrometry.Type: GrantFiled: January 27, 2010Date of Patent: February 26, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Kyeong Pang, Jae-Hwan Kim, Jin-Mo Hong, Su-Bum Park, Jeong-Hyun Lee, Mi-Rim Cho