Phthalocyanine Or Phthalocyanine Derivative Compound In Charge Generator Layer Patents (Class 430/59.4)
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Patent number: 11461601Abstract: A confidential information provision device includes: an information acquisition unit configured to acquire a confidential level of information that is to be printed on a recording medium; and a provision unit configured to provide confidential information to the recording medium in accordance with the confidential level, the confidential information provided to the recording medium being constituted of a material that is detectable in a non-contact manner.Type: GrantFiled: January 4, 2021Date of Patent: October 4, 2022Assignee: FUJIFILM Business Innovation Corp.Inventors: Takeshi Zengo, Mamoru Fujita, Akira Mihara, Atsuyuki Kitamura
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Patent number: 11435674Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer on the conductive substrate. The electrophotographic photoreceptor has an outermost surface layer that contains fluorine-containing resin particles and a fluorine-containing graft polymer. The fluorine-containing resin particles contain 0 or more and 30 or less carboxy groups per 106 carbon atoms. The outermost surface layer has a dielectric constant of 3.75 or more and 3.90 or less. The contact angle of pure water on the outermost surface layer is 90° or more.Type: GrantFiled: July 20, 2020Date of Patent: September 6, 2022Assignee: FUJIFILM Business Innovation Corp.Inventors: Yuto Okazaki, Wataru Yamada, Masahiro Iwasaki, Keisuke Kusano, Taisuke Fukui
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Patent number: 11249407Abstract: The electrophotographic photosensitive member has: a cylindrical support; a charge generating layer formed on the cylindrical support; and a charge transport layer formed on the charge generating layer, the charge generating layer contains a hydroxygallium phthalocyanine crystal having a particular CuK? characteristic X-ray diffraction peak, a titanyl phthalocyanine crystal having a particular CuK? characteristic X-ray diffraction peak or a chlorogallium phthalocyanine crystal having a particular spectral absorption spectrum as a charge generating material, and in the charge generating layer, with respect to the film thickness of the charge generating layer, when a region from the central position of an image forming area to the end position of the image forming area is divided in the axial direction of the cylindrical support into five equal regions and the average film thickness of the charge generating layer in each region satisfies a specific condition.Type: GrantFiled: June 18, 2020Date of Patent: February 15, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Kaname Watariguchi, Tomohito Ishida, Masataka Kawahara, Michiyo Sekiya, Kohei Makisumi
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Patent number: 10871723Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3) disposed directly or indirectly on the conductive substrate (2). The photosensitive layer (3) has a charge generating layer (3a) and a charge transport layer (3b) disposed in order from the conductive substrate (2). The charge generating layer (3a) contains a charge generating material. The charge transport layer (3b) contains a charge transport material, a binder resin, and a pigment that absorbs light having an irradiation wavelength.Type: GrantFiled: December 28, 2017Date of Patent: December 22, 2020Assignee: KYOCERA Document Solutions Inc.Inventors: Kensuke Okawa, Seiki Hasunuma, Jun Azuma
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Patent number: 10401746Abstract: An electrophotographic photosensitive member includes a support member, a charge generating layer containing a phthalocyanine pigment as a charge generating material, a charge transport layer containing a charge transporting material in this order. The charge generating layer has a thickness of less than 200 nm, and the phthalocyanine pigment includes phthalocyanine crystalline particles having a particle size distribution and satisfies a requirement that the volume average of the products of ?i and ?i is 0.31 or more.Type: GrantFiled: April 24, 2018Date of Patent: September 3, 2019Assignee: Canon Kabushiki KaishaInventors: Kaname Watariguchi, Shoma Hinata, Kazuko Araki, Tsutomu Nishida, Jumpei Kuno, Masataka Kawahara, Yuto Ito, Isao Kawata
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Patent number: 9746790Abstract: An electrophotographic photosensitive member includes a support and a photosensitive layer in this order. The photosensitive layer contains a chlorogallium phthalocyanine crystal represented by formula (1) in which at least one organic compound selected from N,N-dimethylformamide and dimethyl sulfoxide is contained. The content of the organic compound contained in the chlorogallium phthalocyanine crystal represented by the formula (1) is 0.10 mass % or more and 0.80 mass % or less based on a content of the chlorogallium phthalocyanine crystal represented by the formula (1).Type: GrantFiled: October 22, 2015Date of Patent: August 29, 2017Assignee: Canon Kabushiki KaishaInventors: Tsutomu Nishida, Masato Tanaka, Masataka Kawahara
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Patent number: 9563139Abstract: An electrophotographic photosensitive member wherein a charge generating layer of the electrophotographic photosensitive member includes a gallium phthalocyanine crystal in which an organic compound is contained, wherein the organic compound is at least one compound selected from the group consisting of dimethylsulfoxide, N,N-dimethylformamide, N-methylformamide, N-propylformamide, N-vinylformamide and N-methylpyrrolidone, the content of the organic compound is 0.1% by mass or more and 2.0% by mass or less based on a gallium phthalocyanine in the gallium phthalocyanine crystal, and a charge transporting layer of the electrophotographic photosensitive member includes a polycarbonate resin having structural units represented by formulae (1) and (2).Type: GrantFiled: October 8, 2015Date of Patent: February 7, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Masataka Kawahara, Masato Tanaka, Jumpei Kuno, Tsutomu Nishida, Kaname Watariguchi
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Patent number: 9557660Abstract: The subject invention relates to a charge transport layer forming coating liquid containing a charge transport material, at least one selected from the group consisting of polycarbonate resins and polyester resins, at least one of xylene and toluene, and cyclopentanone. The proportion of cyclopentanone in the charge transport layer forming coating liquid is in the range of 50% by mass to 85% by mass relative to the total mass of at least one of xylene and toluene and cyclopentanone.Type: GrantFiled: May 10, 2016Date of Patent: January 31, 2017Assignee: Canon Kabushiki KaishaInventors: Koji Takahashi, Naoaki Ichihashi, Kan Tanabe
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Patent number: 9104098Abstract: A charge-generating layer of an electrophotographic photosensitive member includes a phthalocyanine pigment and a specific tricyanoethylene compound. Alternatively, the charge-generating layer and/or an undercoat layer of the electrophotographic photosensitive member includes a specific tricyanoethylene compound, and the charge-generating layer includes the phthalocyanine pigment.Type: GrantFiled: August 29, 2013Date of Patent: August 11, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Tsutomu Nishida, Junpei Kuno, Masataka Kawahara, Kaname Watariguchi, Masato Tanaka
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Patent number: 9086640Abstract: A photosensitive layer of an electrophotographic photosensitive member includes a phthalocyanine pigment and a specific dicyanoethylene compound. Alternatively, the photosensitive layer and/or an undercoat layer of the electrophotographic photosensitive member include a specific dicyanoethylene compound, and the photosensitive layer includes the phthalocyanine pigment.Type: GrantFiled: August 29, 2013Date of Patent: July 21, 2015Assignee: Canon Kabushiki KaishaInventors: Tsutomu Nishida, Junpei Kuno, Kaname Watariguchi, Masataka Kawahara, Masato Tanaka
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Patent number: 9063441Abstract: Provided is an electrophotographic photoconductor including an electroconductive substrate, a photoconductive layer on the electroconductive substrate, and a protection layer on the photoconductive layer, wherein the protection layer contains two or more metal oxides having different average primary particle diameters, a binder resin, and a charge transporting material, the content of the metal oxides in the protection layer is 50% by mass or higher, and the average primary particle diameters of the metal oxides satisfy all of formula (I) to (III) below: d(1)<d(2)??formula (I); d(1)/d(2)?0.25??formula (II); and 0.1 ?m?d(2)??formula (III) where d(1) represents the average primary particle diameter (?m) of one metal oxide of the two or more metal oxides contained in the protection layer, and d(2) represents the average primary particle diameter (?m) of another or the other metal oxide of the two or more metal oxides contained in the protection layer.Type: GrantFiled: October 22, 2013Date of Patent: June 23, 2015Assignee: Ricoh Company, Ltd.Inventors: Hirofumi Yamanami, Koji Enomoto, Naoyuki Esaki
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Publication number: 20150147690Abstract: A photoconductor that includes, for example, a supporting substrate, an optional anticurl layer, an optional ground plane layer, an optional hole blocking layer, an optional adhesive layer, a photogenerating layer, a charge transport layer, and an optional protective coating, and where the photogenerating layer contains a polyarylatecarbonate.Type: ApplicationFiled: November 23, 2013Publication date: May 28, 2015Applicant: XEROX CORPORATIONInventor: Jin Wu
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Publication number: 20150111136Abstract: 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: ApplicationFiled: October 17, 2013Publication date: April 23, 2015Applicant: XEROX CORPORATIONInventor: JIN WU
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Publication number: 20150093695Abstract: An electrophotographic photosensitive member includes a laminated body including a conductive support, a first intermediate layer on the conductive support, and a second intermediate layer on the first intermediate layer, the first intermediate layer containing a binder resin and a metal oxide particle whose surface have been treated with an organic compound, and the second intermediate layer containing a cured product having electron transportability, in which the laminated body satisfies the following expression (1): R—nV/R_0V?0.Type: ApplicationFiled: September 26, 2014Publication date: April 2, 2015Inventors: Hiroyuki Tomono, Kunihiko Sekido, Atsushi Okuda, Takeshi Murakami
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Patent number: 8974991Abstract: Provided is an electrophotographic photosensitive member including a support and a photosensitive layer formed on the support, in which the photosensitive layer includes a phthalocyanine crystal containing a compound satisfying the following formulae (A) and (B) in itself: 8.9??P?10.7 (A) and ?3.2?L??1.5 (B) (in the formula (A), ?P represents a polar term of Hansen Solubility Parameters, and in the formula (B), L represents an energy level (eV) of an LUMO (lowest unoccupied molecular orbital) obtained as a result of structural optimization calculation based on density functional calculation B3LYP/6-31G).Type: GrantFiled: November 29, 2012Date of Patent: March 10, 2015Assignee: Canon Kabushiki KaishaInventors: Masataka Kawahara, Masato Tanaka, Kaname Watariguchi, Takeshi Murakami, Akira Yoshida
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Patent number: 8951702Abstract: A charge transport material having reduced photodeterioration is disclosed to be an ethylene compound having an ethylene double bond site, having a structure in which four different substituents are substituted at the ethylene double bond site, and having general formula (I) below where R1, R2 and R3 are each independently a hydrogen atom, a halogen atom, an alkyl group of 1 to 6 carbons or an alkoxyl group of 1 to 6 carbons; R4 is phenyl or tolyl; and Ar is one group selected from the group consisting of naphthyl, biphenyl, anthryl, xylyl, and phenanthryl. An electrophotographic photoreceptor and process for producing the electrophotographic photoreceptor also are disclosed. The electrophotographic photoreceptor includes a conductive substrate; and a photosensitive layer provided on the conductive substrate that includes the charge transport material.Type: GrantFiled: July 9, 2009Date of Patent: February 10, 2015Assignee: Fuji Electric Co., Ltd.Inventors: Fengqiang Zhu, Yoichi Nakamura, Ikuo Takaki, Seizo Kitagawa, Shinjirou Suzuki
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Patent number: 8846279Abstract: The invention provides a laminate-type electrophotographic photoreceptor for use in a negative charge system, comprising a conductive support, and a photosensitive layer containing a charge generation layer and a charge transport layer, on the conductive support, wherein in addition to a fluorene compound and a diamine compound which are responsible for charge transport, a compound having a specific structure is used in combination.Type: GrantFiled: March 4, 2013Date of Patent: September 30, 2014Assignee: Mitsubishi Chemical CorporationInventor: Akiteru Fujii
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Patent number: 8841052Abstract: In order to provide an electrophotographic photosensitive member with which a ghost is suppressed even under a low temperature and low humidity environment, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member, the electrophotographic photosensitive member has a support, an undercoat layer formed on the support, and a photosensitive layer formed on the undercoat layer and comprising a charge generating material and a hole transporting material, wherein the undercoat layer comprises a particular amine compound.Type: GrantFiled: November 21, 2012Date of Patent: September 23, 2014Assignee: Canon Kabushiki KaishaInventors: Kaname Watariguchi, Takeshi Murakami, Masataka Kawahara, Masato Tanaka, Akira Yoshida
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Patent number: 8808953Abstract: An electrophotographic photoreceptor includes a conductive support, and an undercoat layer, a charge generation layer, and a charge transport layer that are provided in this order on the conductive support, wherein the undercoat layer includes at least metallic oxide particles, a reactive acceptor substance including an anthraquinone structure expressed by the following Formula 1, and a binder resin, the charge generation layer includes hydroxygallium phthalocyanine as a charge generation material, and a reflectance of incident light having a wavelength of 780 nm on a surface of the charge generation layer when the charge transport layer is removed is 17% or greater: wherein the anthraquinone structure expressed by Formula 1 is bonded to another structure at a position of *, and thus forms the reactive acceptor substance, and in Formula 1, n1 represents an integer of 1 to 7.Type: GrantFiled: July 30, 2012Date of Patent: August 19, 2014Assignee: Fuji Xerox Co., Ltd.Inventors: Satoya Sugiura, Shigeto Hashiba, Kazuhiro Koseki, Hirofumi Nakamura, Kenta Ide, Akihiro Nonaka, Kosuke Narita, Akihiro Kawasaki
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Patent number: 8785091Abstract: 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, a charge transport layer, and an optional protective coating, and where the charge transport layer contains a mixture of a charge transport component and a polyarylatecarbonate.Type: GrantFiled: April 13, 2013Date of Patent: July 22, 2014Assignee: Xerox CorporationInventors: Jin Wu, Kenny-Tuan T Dinh, Terry L Street, Robert W Hedrick, Linda L Ferrarese, Than Sorn, Lanhui Zhang, Lin Ma, Stanley J Pietrzykowski, Jr.
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Patent number: 8778579Abstract: Provided is a laminate type electrophotographic photoreceptor including an electrically conductive substrate, and an undercoat layer, a charge generation layer, and a charge transport layer sequentially disposed on the electrically conductive substrate, in which a characteristic response time of the photoreceptor is about 10 msec or more and about 85 msec or less and a thickness of the charge transport layer is greater than about 18 ?m and equal to or less than about 45 ?m. Also, an electrophotographic image forming apparatus and an electrophotographic cartridge using the electrophotographic photoreceptor are provided. An electrophotographic photoreceptor according to the present general inventive concept has an improved response time and thus, charge stain characteristics are excellent even when a thick charge transport layer is selected.Type: GrantFiled: August 20, 2012Date of Patent: July 15, 2014Assignee: Samsung Electronics Co., Ltd.Inventor: Ji-uk Kim
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Patent number: 8765218Abstract: The presently disclosed embodiments are directed generally to methods for making the core-shell fluorinated particles which are incorporated into the overcoat layers of an electrophotographic imaging member to reduce torque and cleaning failures during the photoreceptor cleaning process. The core-shell fluorinated particles are core-shell fluorinated nano- or micro-particles encapsulated in a melamine shell. The present embodiments also pertain to processes for making the overcoat layer comprising the core-shell fluorinated particles.Type: GrantFiled: September 3, 2009Date of Patent: July 1, 2014Assignee: Xerox CorporationInventors: Woo Soo Kim, Nan-Xing Hu, Jennifer A. Coggan, Yvan Gagnon
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Publication number: 20140170540Abstract: The photosensitive layer of an electrophotographic photosensitive member contains (a) a gallium phthalocyanine crystal, (b) a specific amine compound and (c) a specific polyvinylacetal resin.Type: ApplicationFiled: November 25, 2013Publication date: June 19, 2014Applicant: CANON KABUSHIKI KAISHAInventor: Masato Tanaka
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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: 8703372Abstract: An electrophotographic photosensitive member includes a support, a charge-generating layer disposed on the support, and a charge-transporting layer disposed on the charge-generating layer, in which the charge-generating layer contains a charge-generating substance and a compound represented by the formula (1). A process cartridge includes the electrophotographic photosensitive member described above. An electrophotographic apparatus includes the electrophotographic photosensitive member described above.Type: GrantFiled: November 30, 2012Date of Patent: April 22, 2014Assignee: Canon Kabushiki KaishaInventors: Takeshi Murakami, Masataka Kawahara, Kaname Watariguchi, Masato Tanaka, Akira Yoshida
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Publication number: 20140065531Abstract: A charge-generating layer of an electrophotographic photosensitive member includes a phthalocyanine pigment and a specific tricyanoethylene compound. Alternatively, the charge-generating layer and/or an undercoat layer of the electrophotographic photosensitive member includes a specific tricyanoethylene compound, and the charge-generating layer includes the phthalocyanine pigment.Type: ApplicationFiled: August 29, 2013Publication date: March 6, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Tsutomu Nishida, Junpei Kuno, Masataka Kawahara, Kaname Watariguchi, Masato Tanaka
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Publication number: 20140004453Abstract: An electrophotographic photosensitive member has a laminated body, and a hole transporting layer formed on the laminated body, wherein the laminated body is a laminated body having a conductive support, an electron transporting layer and a charge generating layer. When an impedance is measured by forming a circular-shaped gold electrode having a thickness of 300 nm and a diameter of 10 mm on a surface of the charge generating layer of the laminated body by sputtering, and applying an alternating electric field of 100 mV and 0.1 Hz between the conductive support and the gold electrode, the laminated body of the electrophotographic photosensitive member satisfies the following expression (1): R_opt/R_dark?0.Type: ApplicationFiled: June 28, 2013Publication date: January 2, 2014Inventors: Kenichi Kaku, Michiyo Sekiya, Kunihiko Sekido, Atsushi Okuda, Nobuhiro Nakamura, Yota Ito, Hiroyuki Tomono, Yuka Ishiduka
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Patent number: 8617777Abstract: An electrophotographic photosensitive member having a support and a photosensitive layer formed on the support, wherein the photosensitive layer contains a boron complex which is a product of the reaction of a compound having a phenolic hydroxyl group and a carbonyl group with a boron halide. Also disclosed are a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member.Type: GrantFiled: August 6, 2010Date of Patent: December 31, 2013Assignee: Canon Kabushiki KaishaInventor: Masato Tanaka
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Patent number: 8609309Abstract: To provide an electrophotographic photoreceptor having a high sensitivity, a good balance of various electric properties such as chargeability and residual potential, a good stability of the coating solution, and an excellent light resistance. An electrophotographic photoreceptor comprising an electroconductive support having thereon a photosensitive layer, wherein the photosensitive layer contains a compound represented by the following formula (1): (wherein R1 represents a group having a chiral center, R2 represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group which may have a substituent, R3 and R4 each independently represents an alkylene group which may have a substituent, or an arylene group which may have a substituent, and R5, R6, R7 and R8 each independently represents an alkyl group which may have a substituent, or an aryl group which may have a substituent, and at least one member of R5 to R8 is an aryl group having a substituent).Type: GrantFiled: August 16, 2010Date of Patent: December 17, 2013Assignee: Mitsubishi Chemical CorporationInventors: Yuka Nagao, Teruyuki Mitsumori, Masayuki Hiroi
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Patent number: 8568946Abstract: An electrophotographic photoreceptor, comprising a conductive support, an undercoat layer and a photosensitive layer formed in sequence, the electrophotographic photoreceptor characterized in that a coating solution for undercoat layer formation for producing the electrophotographic photoreceptor contains at least a binder resin and metal oxide particles surface-treated with anhydrous silicon dioxide.Type: GrantFiled: February 26, 2010Date of Patent: October 29, 2013Assignee: Sharp Kabushiki KaishaInventors: Satoshi Katayama, Koichi Toriyama, Kimiko Nishi
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Patent number: 8563204Abstract: A photoconductor containing an optional 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 a hydroxygallium phthalocyanine, a hydroxyaluminum phthalocyanine, a polymeric binder, and a silanol.Type: GrantFiled: June 29, 2010Date of Patent: October 22, 2013Assignee: Xerox CorporationInventor: Jin Wu
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Patent number: 8551678Abstract: Disclosed is an electrophotographic photosensitive body which does not cause image defects such as black spots and image unevenness when image exposure is performed using light having a wavelength of 350-500 nm, which is so-called short-wavelength light. The electrophotographic photosensitive body is characterized by having at least an intermediate layer, a charge-generating layer containing a metal phthalocyanine pigment and a charge-transporting layer on a conductive supporting body which has a skewness of the profile (Rsk) within the range of ?8<Rsk<0.Type: GrantFiled: September 2, 2009Date of Patent: October 8, 2013Assignee: Konica Minolta Business Technologies, Inc.Inventor: Shigeaki Tokutake
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Patent number: 8530124Abstract: A hydroxygallium phthalocyanine composite pigment, which is a composite pigment wherein an azo compound expressed by the following general formula (a) is conjugated to a hydroxygallium phthalocyanine pigment, wherein the hydroxygallium phthalocyanine composite pigment has diffraction peaks at least at 7.5°, 9.9°, 12.5°, 16.3°, 18.6°, 25.1°, and 28.3° on an X-ray diffraction spectrum with Bragg angle of 2?±0.2°, using Cu—K? X-rays: A(H)n??General Formula (a) where A is a residue of an azo compound; H is a hydrogen atom; the residue A is bonded to one or more hydrogen atoms, where the number of the hydrogen atoms is expressed with n, via one or more heteroatoms which are selected from the group consisting of N and O, and form part of the residue A; and n is an integer of 1 to 9.Type: GrantFiled: December 10, 2010Date of Patent: September 10, 2013Assignee: Ricoh Company, Ltd.Inventors: Hiromi Sakaguchi, Masafumi Ohta, Yoshiki Yanagawa
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Patent number: 8518615Abstract: A method of drying an organic pigment is provided which includes an under-depressurization microwave drying step of irradiating the organic pigment with microwaves under depressurization and drying the organic pigment. A method of processing a phthalocyanine pigment and a method of manufacturing an electrophotographic photosensitive member are also provided each of which utilizes the drying method.Type: GrantFiled: September 27, 2010Date of Patent: August 27, 2013Assignee: Canon Kabushiki KaishaInventor: Masato Tanaka
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Patent number: 8481240Abstract: Disclosed herein is an electrophotographic imaging member comprising a substrate, and a charge generating layer containing a phthalocyanine pigment, a binder, and a solvent. The charge generating layer has a pigment particle separation distance of 28 nm or less after evaporation of the solvent. A coating system, a method of making an electrophotographic imaging member, and a method of printing also are disclosed.Type: GrantFiled: November 22, 2011Date of Patent: July 9, 2013Assignee: Xerox CorporationInventors: Cindy C. Chen, Lanhui Zhang, Linda L. Ferrarese, James M. Markovics, Marc J. LiVecchi, Edward C. Savage, James R. Backus
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Patent number: 8481235Abstract: A photoconductor that includes, for example, a supporting substrate, an undercoat layer thereover that contains a metal oxide, a phenolic resin, and a pentanediol ester; a photogenerating layer; and at least one charge transport layer.Type: GrantFiled: August 26, 2010Date of Patent: July 9, 2013Assignee: Xerox CorporationInventors: Yuhua Tong, Jin Wu, Nancy L. Belknap, Helen R. Cherniack, Marc J. Livecchi
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Patent number: 8415078Abstract: The charge generation layer of an electrophotographic photosensitive member is made to contain a specific amine compound in order to provide an electrophotographic photosensitive member that can output images that are practically free from an image flaw or have less image flaws attributable to a ghost phenomenon under low temperature and low humidity environment and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member.Type: GrantFiled: June 3, 2011Date of Patent: April 9, 2013Assignee: Canon Kabushiki KaishaInventors: Masato Tanaka, Masaki Nonaka
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Patent number: 8409773Abstract: A photoconductor that includes, for example, a substrate; an undercoat layer thereover wherein the undercoat layer contains a metal oxide, and a mixture of an epoxy resin and a carboxyl resin; a photogenerating layer; and at least one charge transport layer.Type: GrantFiled: February 27, 2009Date of Patent: April 2, 2013Assignee: Xerox CorporationInventors: Jin Wu, Marc J Livecchi, Robert W Hedrick, John J. Wilbert
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Patent number: 8383304Abstract: A gallium phthalocyanine compound represented by the following chemical structure I, where X represents a substituted or non-substituted alkyl group, a substituted or non-substituted alkenyl group, a substituted or non-substituted alkynyl group, a substituted or non-substituted aralkyl group, a substituted or non-substituted cycloalkyl group, a substituted or non-substituted aryl group, or a hydrogen atom, where substitution groups thereof are an alkoxy group, an alkylthio group, an alkyl group, a halogen atom, nitro group, amino group, an aryl group, carboxylic group, and cyano group, R1 to R16 independently represent a hydrogen atom, an alkoxy group, an alkylthio group, an alkyl group, a halogen atom, nitro group, or aryl group, n represents an integer of from 1 to 3 but excluding a combination in which n is 1 and X is methyl group.Type: GrantFiled: February 17, 2011Date of Patent: February 26, 2013Assignee: Ricoh Company, Ltd.Inventors: Yoshiki Yanagawa, Masafumi Ohta
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Patent number: 8377615Abstract: A photoconductor that includes a supporting substrate, a ground plane layer, a hole blocking layer, an adhesive layer, a photogenerating layer, and at least one charge transport layer of a charge transporting polycarbonate or a mixture of a charge transporting polycarbonate and a second polymer such as a polycarbonate.Type: GrantFiled: November 23, 2010Date of Patent: February 19, 2013Assignee: Xerox CorporationInventor: Jin Wu
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Patent number: 8323861Abstract: An electrophotographic photoreceptor having high sensitivity and low residual potential is provided. The electrophotographic photoreceptor includes an undercoat layer containing metal oxide particles and a binder resin on an electroconductive substrate, and a photosensitive layer disposed on the undercoat layer, wherein the metal oxide particles have a volume average particle diameter of 0.1 ?m or less and a 90% cumulative particle diameter of 0.3 ?m or less which are measured by a dynamic light-scattering method in a liquid of the undercoat layer dispersed in a solvent mixture of methanol and 1-propanol at a weight ratio of 7:3; and the photosensitive layer contains crystalline phthalocyanine showing at least one distinct main diffraction peak at a Bragg angle (2?±0.2°) of 27.0° to 29.0° in an X-ray diffraction spectrum.Type: GrantFiled: May 18, 2007Date of Patent: December 4, 2012Assignee: Mitsubishi Chemical CorporationInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroe Fuchigami
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Patent number: 8288066Abstract: To provide an electrophotographic photoreceptor having a high sensitivity, a good balance of various electric properties such as chargeability and residual potential, a good stability of the coating solution, and an excellent light resistance. An electrophotographic photoreceptor comprising an electroconductive support having thereon a photosensitive layer, wherein the photosensitive layer contains a compound represented by the following formula (1): (wherein R1 represents a group having a chiral center, R2 represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group which may have a substituent, R3 and R4 each independently represents an alkylene group which may have a substituent, or an arylene group which may have a substituent, and R5, R6, R7 and R8 each independently represents an alkyl group which may have a substituent, or an aryl group which may have a substituent, and at least one member of R5 to R8 is an aryl group having a substituent).Type: GrantFiled: January 5, 2006Date of Patent: October 16, 2012Assignee: Mitsubishi Chemical CorporationInventors: Yuka Nagao, Teruyuki Mitsumori, 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: 8216759Abstract: The present invention provides an electrophotographic carrier which includes a core particle, a first resin layer containing a charge-generating material for coating the core particle, and a second resin layer containing a hole-transporting material for coating the first resin layer. The invention also provides a two-component developer comprising said carrier, and an image-forming process and apparatus using said developer. According to the invention, high quality images can be formed, with excellent image density (especially when developing solid images) and less fogging.Type: GrantFiled: June 23, 2009Date of Patent: July 10, 2012Assignee: Sharp Kabushiki KaishaInventor: Keigo Mitamura
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Patent number: 8206502Abstract: The invention is directed to mixtures of PcTiO and a minor amount of another, substituted titanyl phthalocyanine and the synthesis of mixtures of PcTiO and a minor amount of another, substituted titanyl phthalocyanine. The invention is further directed towards milled pigment compositions of such mixtures, and to use of such milled pigment compositions in an electrophotographic element.Type: GrantFiled: December 15, 2008Date of Patent: June 26, 2012Assignee: Eastman Kodak CompanyInventor: William T. Gruenbaum
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Patent number: 8206880Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; and a photosensitive layer overlying the substrate, wherein the photosensitive layer comprises a complex azo pigment comprising an azo compound having the following formula (a): A(H)n??(a) wherein A represents a residue of an azo compound, bonded with n pieces of hydrogen atom through one or more heteroatom being N or O and forming a part of the residue A; H represents a hydrogen atom; and n represents an integer of from 1 to 9, and a pigment.Type: GrantFiled: June 2, 2010Date of Patent: June 26, 2012Assignee: Ricoh Company, Ltd.Inventors: Hiromi Tada, Masafumi Ohta, Tatsuya Niimi, Norio Nagayama, Yoshiki Yanagawa, Yuuji Tanaka
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Patent number: 8173338Abstract: An electrophotographic photoconductor system for use in an electrophotographic device and method of using the same. The electrophotoconductor system comprises an electroconductive support, a charge generation layer disposed on the electroconductive support, and a charge transport layer disposed on the charge generation layer. The charge generation layer includes a photosensitive material comprising titanyl phthalocyanine, and at least one oligomeric phenylene additive. The electrophotographic photoconductor system is capable of absorbing light having a wavelength of about 350 nm to about 850 nm.Type: GrantFiled: February 11, 2009Date of Patent: May 8, 2012Assignee: Lexmark International, Inc.Inventors: Mark Thomas Bellino, Weimel Luo, Scott Daniel Reeves, Tanya Yvonne Thames
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Patent number: 8153341Abstract: A photoconductor that includes, for example, a supporting substrate, an undercoat layer thereover wherein the undercoat layer contains a metal oxide, a phenolic resin, and a phosphate; a photogenerating layer; and at least one charge transport layer.Type: GrantFiled: April 28, 2010Date of Patent: April 10, 2012Assignee: Xerox CorporationInventors: Yuhua Tong, Jin Wu, Nancy L Belknap, Helen R Cherniack, Marc J Livecchi
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Publication number: 20120052428Abstract: A photoconductor that includes, for example, a supporting substrate, an undercoat layer thereover that contains a metal oxide, a phenolic resin, and a pentanediol ester; a photogenerating layer; and at least one charge transport layer.Type: ApplicationFiled: August 26, 2010Publication date: March 1, 2012Applicant: XEROX CORPORATIONInventors: Yuhua Tong, Jin Wu, Nancy L. Belknap, Helen R. Cherniack, Marc J. Livecchi
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Patent number: 8119316Abstract: A photoconductor comprising 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 a thiuram sulfide additive.Type: GrantFiled: March 31, 2008Date of Patent: February 21, 2012Assignee: Xerox CorporationInventors: Liang-Bih Lin, Daniel V Levy, Jin Wu, Markus R Silvestri