Charge Transport Layer Containing Alkenylarylamine Patents (Class 430/58.85)
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Publication number: 20120064443Abstract: An N-phenyl-diphenylisoindole derivative having the following formula (I): wherein each of R1 and R2 represents a hydrogen atom, a substituted or an unsubstituted alkyl group, a substituted or an unsubstituted alkoxy group, a substituted or an unsubstituted phenyl group, or a substituted or an unsubstituted phenoxy group; R3 represents a hydrogen atom, a substituted or an unsubstituted alkyl group, a substituted or an unsubstituted alkoxy group, a substituted or an unsubstituted phenyl group, a substituted or an unsubstituted phenoxy group, or has the following formula (2): wherein each of R4 and R5 represents a substituted or an unsubstituted alkyl group, or a substituted or an unsubstituted phenyl group; 1 represents an integer of from 1 to 4; and each of m and n represents an integer of from 1 to 5.Type: ApplicationFiled: September 13, 2011Publication date: March 15, 2012Inventors: Ryota ARAI, Tomoyuki Shimada
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Patent number: 8088540Abstract: An object of the invention is to provide a photoreceptor for electrophotography which has a low residual potential in an initial stage, is inhibited from increasing in residual potential, is prevented from decreasing in charge potential, undergoes little fatigue deterioration even upon repeated use, and is less apt to pose a problem concerning toxicity or environmental pollution. The invention relates to a photoreceptor for electrophotography which has a photosensitive layer containing an aromatic hydroxycarboxylic acid metal complex represented by the following general formula (1): and one or more charge-transporting agents each having an arylaminophenyl group in the molecule.Type: GrantFiled: January 18, 2007Date of Patent: January 3, 2012Assignee: Hodogaya Chemical Co., Ltd.Inventors: Katsumi Abe, Makoto Koike, Atsushi Takesue
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Patent number: 8026027Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and an (enylaryl)bisarylamine containing charge transport layer.Type: GrantFiled: June 30, 2008Date of Patent: September 27, 2011Assignee: Xerox CorporationInventor: Jin Wu
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Patent number: 8007971Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and a tris(enylaryl)amine containing charge transport layer.Type: GrantFiled: June 30, 2008Date of Patent: August 30, 2011Assignee: Xerox CorporationInventor: Jin Wu
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Patent number: 8003287Abstract: The present invention provides an electrophotographic photoconductor comprising an electroconductive substrate and a photosensitive layer provided on the electroconductive substrate, wherein the photosensitive layer comprises a charge-generating material and a charge-transporting material, the charge-transporting material comprising a compound represented by the general formula (1): wherein Ar1 and Ar2 each independently represent an optionally-substituted arylene or bivalent heterocyclic group; Ar3 and Ar4 each independently represent a hydrogen atom, or an optionally-substituted aryl or monovalent heterocyclic group, but are not simultaneously hydrogen atoms; or Ar3 and Ar4 may be taken together to form an optionally-substituted bivalent cyclic hydrocarbon or heterocyclic group; and n is 0 or 1.Type: GrantFiled: December 17, 2007Date of Patent: August 23, 2011Assignee: Sharp Kabushiki KaishaInventors: Takatsugu Obata, Akihiro Kondoh
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Patent number: 7981580Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and a charge transport layer that includes a charge transport component, and a mixture of a bis(enylaryl)arylamine and a tris(enylaryl)amine.Type: GrantFiled: June 30, 2008Date of Patent: July 19, 2011Assignee: Xerox CorporationInventor: Jin Wu
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Patent number: 7968262Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and a bis(enylaryl)arylamine containing charge transport layer.Type: GrantFiled: June 30, 2008Date of Patent: June 28, 2011Assignee: Xerox CorporationInventor: Jin Wu
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Patent number: 7964327Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; and a photosensitive layer, located overlying the electroconductive substrate, wherein an outermost layer of the electrophotographic photoreceptor includes an amine compound and a charge transport material, and wherein the amine compound includes an amine site having an electrostatic potential with a dimensionless unit not greater than ?0.27.Type: GrantFiled: June 13, 2007Date of Patent: June 21, 2011Assignee: Ricoh Company Ltd.Inventors: Masanobu Gondoh, Akihiro Sugino, Hideo Nakamori, Shinji Nohsho, Tomoyuki Shimada, Takaaki Ikegami
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Publication number: 20110104600Abstract: A function separation type electrophotographic photoconductor comprising: a conductive support; an undercoat layer formed on the conductive support; a charge generation layer formed on the undercoat layer; and a charge transfer layer formed on the charge generation layer, the undercoat layer containing at least a binder resin and metal oxide microparticles subjected to surface treatment with anhydrous silicon dioxide, the charge transfer layer containing at least a binder resin and an enamine compound represented by the following general formula (1): wherein one or more of R1, R2, R3, R4 and R5 represent a C6-C10 aryl group that may have a substituent; the others each represent hydrogen atom or C1-C4 alkyl, C4-C9 heterocyclic, C7-C16 aralkyl or C11-C16 arylidene alkyl group that may have a substituent; or R2 and R3 together with carbon atoms with which they are combined may form a cyclic or condensed cyclic group that may have a substituent.Type: ApplicationFiled: October 28, 2010Publication date: May 5, 2011Inventors: Takahiro Kurauchi, Satoshi Katayama, Koichi Toriyama
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Publication number: 20110059392Abstract: An electrophotographic photoreceptor including a conductive substrate and a photosensitive layer overlying the conductive substrate. The photosensitive layer comprises a phthalimide isoindole derivative having a specific chemical formula.Type: ApplicationFiled: September 7, 2010Publication date: March 10, 2011Applicant: RICOH COMPANY, LTD.Inventors: Tomoyuki SHIMADA, Ryota Arai
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Publication number: 20100290807Abstract: An electrophotographic photoconductor including a conductive substrate and a photoconductive layer thereover, wherein the photoconductive layer contains a charge generation agent and a charge transport agent represented by General Formula (A-I), (B-I) or (C-I), and an amine compound represented by General Formula (II): where R1-3 each represent hydrogen, halogen or (un)substituted C1-6 alkyl, and n is 1 or 2, where R1-2 each represent C1-6 alkyl and R3-6 each represent hydrogen, halogen or (un)substituted C1-6 alkyl, where R8-33 each represent hydrogen, C1-4 alkyl, C1-4 alkoxy, or (un)substituted phenyl, and may be identical or different, where A and B each represent a group represented by formula (i) or (ii), and may be identical or different: —CH2X ??formula (i) —CH2CH2Y ??formula (ii) where X and Y each represent an (un)substituted aromatic group.Type: ApplicationFiled: May 12, 2010Publication date: November 18, 2010Inventors: Keisuke SHIMOYAMA, Takaaki Ikegami, Eiji Kurimoto, Kohsuke Yamamoto, Tetsuya Sakuma, Toshihiko Koizumi, Hajime Suzuki, Hideki Nakamura
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Patent number: 7829251Abstract: Disclosed herein is a flexible imaging member having a high concentration of a charge transport compound having optimum enhanced mechanical and electrical characteristics. By increasing the concentration of the charge transport compound to a level of from about 55 weight percent or more, including from about 55 weight percent to about 70 weight percent, and from about 55 weight percent to about 65 weight percent, a flexible imaging member can be produced with reduced residual voltage and/or improved sensitivity. Furthermore, the fatigue cracking resistance of the charge transport layer can be improved through the implementation of a heat stress release process described more particularly herein.Type: GrantFiled: March 24, 2005Date of Patent: November 9, 2010Assignee: Xerox CorporationInventors: Anthony M. Horgan, Robert C. U. Yu, Satchidanand Mishra
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Patent number: 7803507Abstract: An electrophotographic photoreceptor of high durability capable of providing stable excellent electrical characteristics over a prolonged period of time, which electrophotographic photoreceptor excels in mechanical strength. A photosensitive layer (14) of an electrophotographic photoreceptor (1) includes a polyarylate resin having structural units, for example, those of formula (1) and an enamine compound represented by, for example, formula (2) The variables R1, R2, R3, R4, R7˜R10, X1, Ar1, Ar2, Ar3, Ar4, Ar5, R11, R12, R13, R14, a, m, and n are as defined in the specification. By virtue of these, the electrophotographic photoreceptor (1) of excellent mechanical strength and favorable electrical characteristics can be realized.Type: GrantFiled: February 6, 2004Date of Patent: September 28, 2010Assignee: Sharp Kabushiki KaishaInventors: Tatsuhiro Morita, Tomoko Kanazawa, Akihiro Kondoh, Yohichi Takesawa, Takatsugu Obata, Shinya Mimura, Hiroshi Sugimura
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Publication number: 20100233602Abstract: An electrophotographic photoconductor including a conductive substrate, and a photosensitive layer formed on the conductive substrate, wherein the photosensitive layer contains at least a charge generation agent, a specific charge transfer agent and a specific antioxidant.Type: ApplicationFiled: March 11, 2010Publication date: September 16, 2010Applicant: RICOH COMPANY, LTD.Inventors: Kohsuke Yamamoto, Takaaki Ikegami, Eiji Kurimoto, Keisuke Shimoyama, Hideki Nakamura, Toshihiko Koizumi, Hajime Suzuki
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Patent number: 7767371Abstract: The presently disclosed embodiments are directed to charge transport layers useful in electrostatography. More particularly, the embodiments pertain to an electrostatographic imaging member comprising a charge transport layer that exhibits improved charge mobility transport.Type: GrantFiled: August 10, 2006Date of Patent: August 3, 2010Assignee: Xerox CorporationInventors: Timothy P. Bender, Gregory McGuire
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Publication number: 20100183332Abstract: An electrophotographic photoreceptor comprising a conductive support and a photosensitive layer formed thereon, wherein the photosensitive layer comprises a polyarylate resin having a repeating structure represented by the following formula [1] and a compound represented by the following formula [6]. This electrophotographic photoreceptor has excellent wearing resistance under load in the practical use of the photoreceptor and has high mechanical strength and extremely satisfactory electrical characteristcis.Type: ApplicationFiled: June 11, 2008Publication date: July 22, 2010Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Rui Zhao, Yuka Nagao, Teruyuki Mitsumori, Tadashi Mizushima, Shunichiro Kurihara, Takayuki Shoda
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Patent number: 7754403Abstract: An organic photoconductive material which is useful as a raw material compound for a variety of functional materials and makes it possible to implement an electrophotoconductor which is excellent in terms of the charge transporting performance, excellent in terms of dissolution in solvents and compatibility with resins, and excellent in terms of both the electrical properties and durability is provided. An example is an asymmetric bishydroxy compound which can be represented by the following structural formula (1aa). This compound is contained in a charge transforming layer 4 or a surface protective layer 5 of an electrophotoconductor 18. As a result, an electrophotoconductor 18 which is excellent in terms of the electrical properties and durability and can stably form high quality images without image defects such as black dots can be implemented.Type: GrantFiled: February 21, 2007Date of Patent: July 13, 2010Assignee: Sharp Kabushiki KaishaInventors: Akihiro Kondoh, Hiroshi Sugimura, Takatsugu Obata
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Publication number: 20100150608Abstract: To provide an electrophotographic photoreceptor excellent in electric characteristics and various characteristics, capable of forming a uniform photosensitive layer and excellent in repetitive characteristics, an image forming apparatus using it and an electrophotgraphic cartridge. A lamination type electrophotographic photoreceptor comprising an electroconductive substrate and a photosensitive layer formed thereon, characterized in that the photosensitive layer contains a compound represented by the following formula (1), the ratio of the weight of the compound represented by the formula (1) to the weight content of all binder resins contained in the photosensitive layer is from 0.15 to 0.Type: ApplicationFiled: September 28, 2006Publication date: June 17, 2010Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Teruyuki Mitsumori, Masayuki Hiroi, Hiroaki Takamura
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Patent number: 7727693Abstract: An object of the invention is to provide an electrophotographic photoreceptor showing high responsivity even under a low temperature and low humidity circumstance and capable of compatibilize the decrease of the size and the increase in the image forming speed of an electrophotographic apparatus. In a photosensitive layer of an electrophotographic photoreceptor, oxotitanium phthalocyanine having a crystal form showing a diffraction peak at a Bragg angle 2? (error: 2?±0.2°) of 27.2° in an X-ray diffraction spectrum is contained as a charge generating substance, and an enamine compound represented by the general formula for example, the structural formula (1-1) is contained as a charge transporting substance. Accordingly, the electrophotographic photoreceptor showing high responsivity even under a low temperature and low humidity circumstance is realized.Type: GrantFiled: April 16, 2004Date of Patent: June 1, 2010Assignee: Sharp Kabushiki KaishaInventors: Kazuya Ishida, Akihiro Kondoh, Takatsugu Obata
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Patent number: 7709170Abstract: A latent electrostatic image bearing member including at least a support, a photoconductive layer on the support and a surface layer on the photoconductive layer, wherein a film having the same composition as the surface layer is formed on a slide glass such that the film had a thickness of 5 ?m; and the haze value measured after rubbing the film with a steel wool of #000 and a load of 500 gf for 50 times is 10% or less.Type: GrantFiled: June 20, 2006Date of Patent: May 4, 2010Assignee: Ricoh Company, Ltd.Inventor: Hidetoshi Kami
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Patent number: 7704655Abstract: An electrophotographic photoreceptor which can respond to a reduction in diameter of photoreceptor and a process having high circumferential speed, due to the demand in the miniaturization and increase in the speed of copiers and printers. The photoreceptor has high sensitivity in long-wavelength region, and is free from deterioration of electric characteristics even after repeated use, and is highly stable. The electrophotographic photoreceptor has a conductive support member and a photosensitive layer laminated thereon, which includes at least a charge-generating agent, a charge-transfer agent, and a binder resin. The charge-generating agent is oxytitanium phthalocyanine, which has a Bragg angle (2?±0.2°) providing a maximum peak at 27.2° in the X-ray diffraction spectra using CuK? as a radiation source.Type: GrantFiled: July 30, 2008Date of Patent: April 27, 2010Assignees: Yamanashi Electronics Co., Ltd., Ricoh Company, Ltd.Inventors: Hajime Suzuki, Tsuyoshi Ueda, Toshihiko Koizumi, Hideki Nakamura, Tetsuya Sakuma
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Publication number: 20090325096Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and a tris(enylaryl)amine containing charge transport layer.Type: ApplicationFiled: June 30, 2008Publication date: December 31, 2009Applicant: XEROX CORPORATIONInventor: Jin Wu
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Publication number: 20090325093Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and an (enylaryl)bisarylamine containing charge transport layer.Type: ApplicationFiled: June 30, 2008Publication date: December 31, 2009Applicant: XEROX CORPORATIONInventor: Jin Wu
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Publication number: 20090325092Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and a bis(enylaryl)arylamine containing charge transport layer.Type: ApplicationFiled: June 30, 2008Publication date: December 31, 2009Applicant: XEROX CORPORATIONInventor: Jin Wu
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Patent number: 7638248Abstract: An electrophotographic photoconductor containing a conductive substrate and at least a charge generating layer and a charge transporting layer successively layered on the substrate, wherein the charge transporting layer contains a charge transporting material (M) and a binder resin (B) and further has a layered structure composed of a plurality of the charge transporting layers wherein the outermost layer of the charge transporting layers show 50% or higher elastic power (?Hu) and hardness (Hplast) of plastic deformation in a range from 220 N/mm2 or higher to 275 N/mm2 or lower.Type: GrantFiled: November 7, 2006Date of Patent: December 29, 2009Assignee: Sharp Kabushiki KaishaInventors: Kotaro Fukushima, Hisayuki Utsumi, Tomoko Kanazawa, Katsuya Takano
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Publication number: 20090305155Abstract: A electrophotographic photoreceptor comprising a monolayered photosensitive layer containing a charge generation material and a charge transport material or a multilayered photosensitive layer obtained by laying a charge generation layer containing a charge generation material and a charge transport layer containing a charge transport material in this order or in reverse order, on a conductive support, wherein the monolayered photosensitive layer or the charge transport layer of the multilayered photosensitive layer contains, as the charge transport material, an enamine compound represented by the formula (I): wherein Ar1 and Ar2, which may be the same or different, respectively represent an aryl group which may have a substituent or a monovalent heterocyclic residue which may have a substituent; R1 and R2, which may be the same or different, respectively represent a hydrogen atom, a halogen atom, an alkyl group which may have a substituent or an alkoxy group which may have a substituent; and R3 represeType: ApplicationFiled: June 4, 2009Publication date: December 10, 2009Inventors: Takatsugu OBATA, Akihiro KONDOH
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Patent number: 7629096Abstract: An electrophotographic photoreceptor that without detriment to excellent electrophotographic performance, realizes coating of any defects on a conductive substrate and excels in repetition stability and environmental performance. There is provided an electrophotographic photoreceptor having a photoreceptive layer superimposed via an undercoat layer on a conductive support, characterized in that the undercoat layer contains a polyimide resin and that at least one of the compounds of the following formulae is contained as a charge transfer agent of the photoreceptive layer.Type: GrantFiled: December 21, 2004Date of Patent: December 8, 2009Assignee: Yamanashi Electronics Co., Ltd.Inventors: Hajime Suzuki, Tadayoshi Uchida, Ryoji Kobayashi
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Patent number: 7629094Abstract: An electrophotographic photoreceptor including an electroconductive substrate and a photosensitive layer located overlying the electroconductive substrate, wherein the photosensitive layer comprises units obtained from a radical polymerizing monomer, in which an aliphatic group having two radical polymerizing groups and a charge transporting group including no radical polymerizing group are connected to each other in a single bond, at the surface thereof.Type: GrantFiled: December 27, 2005Date of Patent: December 8, 2009Assignee: Ricoh Company, Ltd.Inventors: Kazukiyo Nagai, Tetsuro Suzuki, Hiroshi Tamura, Hongguo Li, Tamotsu Horiuchi
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Patent number: 7625681Abstract: There is provided an organic photoconductive material that can realize an electrophotographic photoreceptor which is not only excellent in charge transporting ability but also excellent in solubility in a solvent and compatibility with a resin and moreover, which is excellent in both electric properties and durability, and the organic photoconductive material that is useful also as a raw material compound for various types of functional materials. An asymmetric bis-hydroxyenamine compound represented by the following structural formula (1aa) is provided. The compound is allowed to be contained in a charge transporting layer or a surface protective layer of an electrophotographic photoreceptor. This leads realization of the electrophotographic photoreceptor which is excellent in electric properties and durability and can stably form an image of high quality being free of an image defect such as a black spot.Type: GrantFiled: May 31, 2006Date of Patent: December 1, 2009Assignee: Sharp Kabushiki KaishaInventors: Akihiro Kondoh, Hiroshi Sugimura, Takatsugu Obata
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Patent number: 7622232Abstract: An electrophotographic photoreceptor including a photosensitive layer which includes a titanyl phthalocyanine crystal having a major absorption peak at a wavelength of 780 nm±10 nm and a minor absorption peak having an intensity of ¾ or less of the major absorption peak at 690 nm±10 nm in the visible-infrared absorption spectrum and a distyryl compound having a predetermined structure. An electrophotographic image forming apparatus employing the electrophotographic photoreceptor is also provided. The electrophotographic photoreceptor and the electrophotographic image forming apparatus have good photosensitivity and charging properties and good stability over repeated charging obtained by using an optimum combination of a new crystal type of a highly photosensitive titanyl phthalocyanine and a distyryl compound which is a charge transporting material that is compatible with the titanyl phthalocyanine.Type: GrantFiled: December 14, 2006Date of Patent: November 24, 2009Assignee: Samsung Electronics Co., Ltd.Inventors: Saburo Yokota, Seung-ju Kim
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Patent number: 7615326Abstract: A charge transporting substance having three stilbene structures or butadiene structures in a molecule, represented by the following general formula is used as an organic photoconductive material. An electrophotographic photoconductor is prepared by causing a photosensitive layer which is disposed on a conductive support, to contain the organic photoconductive material in order to dispose the photoconductor to an image forming apparatus.Type: GrantFiled: June 1, 2007Date of Patent: November 10, 2009Assignee: Sharp Kabushiki KaishaInventors: Takatsugu Obata, Akihiro Kondoh
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Patent number: 7608372Abstract: Provided are a photoreceptor, an image forming method, an image forming apparatus and a processing cartridge exhibiting an excellent effect on high quality toner images with no image defect caused by occurrence of fog, lowered image density and sharpness, or generation of black spots. Disclosed also is an electrophotographic photoreceptor including an electrically conductive support containing aluminum, an uppermost layer, and at least an intermediate layer containing inorganic particles and binder, the intermediate layer being provided between the support and the uppermost layer, wherein the support has on a surface of the support crystallizing material particles having a diameter of 0.3-10 ?m in an amount of being 0.5-20 per (20 ?m)2, the inorganic particles have a number average primary particle diameter of 5-300 nm, the intermediate layer is an insulating layer and covered by the uppermost layer.Type: GrantFiled: October 26, 2005Date of Patent: October 27, 2009Assignee: Konica Minolta Business Technologies, IncInventors: Takeshi Ishida, Kimiyuki Itou, Fumitaka Mochizuki, Shinichi Yabuki
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Patent number: 7598010Abstract: A triarylamine dimer derivative is represented by the following chemical formula [1] (in the chemical formula [1]: —Ar1, —Ar2, —Ar3 and —Ar4 are aryl groups being to have a substitutional group respectively, —R1 and —R2 are same or different to each other and one thereof is selected from the group consisting of a hydrogen atom, an alkyl group, an alkoxyl group and a halogen atom; m and n are from 0 to 4; and with a proviso that —Ar1 and —Ar2, —Ar3 and —Ar4 are being to bind respectively to compose a cyclic structure group having a nitrogen atom) having an amorphous phase indicated by spectrum of powder X-ray diffractometry. The triarylamine dimer derivative is used for a charge transport material, an electrophotographic photosensitive conductor having thereof, an electroluminescence elemental device having a hole transport material thereof.Type: GrantFiled: November 30, 2004Date of Patent: October 6, 2009Assignee: Orient Chemical Industries, Ltd.Inventors: Yoshio Kita, Yasuhiro Yamasaki
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Patent number: 7588871Abstract: An electrophotographic photoreceptor having excellent electric characteristics such as sensitivity characteristic and light responsiveness with an excellent life duration of abrasion resistance so that no flaw and density unevenness are generated on to-be-formed images for a long period of time, is provided. In an electrophotographic photoreceptor (1), an enamine compound represented by the following general formula (1), for example, an enamine compound represented by the following structural formula (1-1) is contained in a charge transporting layer (6), and a creep value (CIT) in a case where a maximum indentation load of 30 mN is put on a surface for 5 seconds under circumstances of temperature of 25° C. and relative humidity of 50%, is set to 2.70% or more and 5.00% or less, and a plastic deformation hardness value (Hplast) of the surface is set to 220 N/mm2 or more and 275 N/mm2 or less.Type: GrantFiled: October 8, 2004Date of Patent: September 15, 2009Assignee: Sharp Kabushiki KaishaInventors: Akiko Kihara, Kotaro Fukushima, Takatsugu Obata
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Patent number: 7582399Abstract: Imaging members useful in electrostatographic apparatuses, including printers, copiers, other reproductive devices, and digital apparatuses. More particularly, imaging members having nano polymeric gel particles embedded into one or more layers of the imaging member that provide for increased mechanical strength and improved wear.Type: GrantFiled: June 22, 2006Date of Patent: September 1, 2009Assignee: Xerox CorporationInventors: Satchidanand Mishra, Yuhua Tong, Kathleen Carmichael, Markus Silvestri, Susan Vandusen, Chieh-Min Cheng, Huoy-Jen Yuh, Cindy Chen, Lanhui Zhang
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Patent number: 7575838Abstract: An imaging member including a substrate; thereover a charge generation layer comprising a thiophosphate; and at least one charge transport layer positioned on the charge generation layer.Type: GrantFiled: July 6, 2006Date of Patent: August 18, 2009Assignee: Xerox CorporationInventors: Jin Wu, Geoffrey M. T. Foley, Satchidanand Mishra, Liang-bih Lin, Anthony M. Horgan, Yonn K. Rasmussen, Kathleen M. Carmichael, Edward F. Grabowski, Markus Rudolf Silvestri
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Patent number: 7563548Abstract: An amine compound represented by the general formula (1), which is incorporated as a charge-transporting substance to a charge-transporting layer of an electrophotographic photoreceptor: (in which Ar1, Ar2 and Ar3 each represents an optionally-substituted aryl group, or an optionally-substituted monovalent heterocyclic ring residue. Ar4 represents an optionally-substituted arylene group, or an optionally-substituted bivalent heterocyclic ring residue. R1 represents an optionally-substituted alkyl group, an optionally-substituted aryl group, an optionally-substituted monovalent heterocyclic ring residue, or an optionally-substituted aralkyl group. R2 and R3 each represents a hydrogen atom, an optionally-substituted alkyl group, an optionally-substituted aryl group, an optionally-substituted monovalent heterocyclic ring residue, or an optionally-substituted aralkyl group. n represents an integer of 1 or 2.Type: GrantFiled: November 30, 2004Date of Patent: July 21, 2009Assignee: Sharp Kabushiki KaishaInventors: Akihiro Kondoh, Takatsugu Obata
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Patent number: 7534539Abstract: An object of the invention is to provide a highly reliable electrophotographic photoreceptor having high sensitivity, excellent in light responsivity, not suffering from lowering of such characteristics even when it is used under a low temperature circumstance or in a high speed electrophotographic process, and with less fatigue degradation upon repetitive use. In a photosensitive layer of an electrophotoreceptor, an enamine compound represented by the following general formula (1), for example, the following structural formula is contained as a charge transporting substance, and further at least one of an antioxidant and a light stabilizer is contained. Accordingly, an electrophotographic photoreceptor excellent in sensitivity and light responsivity in various environments, and with less fatigue degradation upon repetitive use is realized.Type: GrantFiled: May 31, 2004Date of Patent: May 19, 2009Assignee: Sharp Kabushiki KaishaInventors: Takatsugu Obata, Akihiro Kondoh, Kazuya Ishida
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Patent number: 7527903Abstract: A flexible imaging member which does not require the use of an anti-curl back coating is disclosed herein. The flexible imaging member has a layer comprising two charge transport molecules dispersed in a film-forming polymer binder. The first charge transport molecule is a biphenyl amine, terphenyl diamine, or bis(triarylamine) stilbene. The second charge transport molecule is a bis(triarylamine), tri-p-tolylamine, or triphenylamine. The weight ratio of second charge transport molecule to first charge transport molecule is from about 90:10 to about 67:33. Trifluoro acetic acid is also added to the layer containing the charge transport material.Type: GrantFiled: October 28, 2005Date of Patent: May 5, 2009Assignee: Xerox CorporationInventors: Kathleen M. Carmichael, Kent J. Evans, Kathy Lippman, legal representative, Satish Parikh, Donald Sullivan
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Publication number: 20090011349Abstract: An object of the invention is to provide a photoreceptor for electrophotography which has a low residual potential in an initial stage, is inhibited from increasing in residual potential, is prevented from decreasing in charge potential, undergoes little fatigue deterioration even upon repeated use, and is less apt to pose a problem concerning toxicity or environmental pollution. The invention relates to a photoreceptor for electrophotography which has a photosensitive layer containing an aromatic hydroxycarboxylic acid metal complex represented by the following general formula (1): and one or more charge-transporting agents each having an arylaminophenyl group in the molecule.Type: ApplicationFiled: January 18, 2007Publication date: January 8, 2009Applicant: Hodogaya Chemical Co., Ltd.Inventors: Katsumi Abe, Makoto Koike, Atsushi Takesue
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Publication number: 20090004585Abstract: An electrophotographic photoreceptor which can respond to a reduction in diameter of photoreceptor and a process having high circumferential speed, due to the demand in the miniaturization and increase in the speed of copiers and printers. The photoreceptor has high sensitivity in long-wavelength region, and is free from deterioration of electric characteristics even after repeated use, and is highly stable. The electrophotographic photoreceptor has a conductive support member and a photosensitive layer laminated thereon, which includes at least a charge-generating agent, a charge-transfer agent, and a binder resin. The charge-generating agent is oxytitanium phthalocyanine, which has a Bragg angle (2?±0.2°) providing a maximum peak at 27.2° in the X-ray diffraction spectra using CuK? as a radiation source.Type: ApplicationFiled: July 30, 2008Publication date: January 1, 2009Applicants: YAMANASHI ELECTRONICS CO., LTD., RICOH COMPANY, LTD.Inventors: Hajime Suzuki, Tsuyoshi Ueda, Toshihiko Koizumi, Hideki Nakamura, Tetsuya Sakuma
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Publication number: 20080305417Abstract: a monolayer type photoreceptor obtained by laminating a monolayer type photosensitive layer containing a charge generation material and a charge transport material on a conductive support, wherein the above monolayer type photosensitive layer comprises, as the above charge transport material; a hole transport material represented by the following formula (1) and an electron transport material represented by the following formula (2)Type: ApplicationFiled: May 8, 2008Publication date: December 11, 2008Inventors: Hiroshi Sugimura, Akihiro Kondoh
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Patent number: 7457565Abstract: An image forming apparatus having excellent chargeability, sensitivity and light responsivity of an electrophotographic photoconductor and capable of forming images of high quality and high resolution at a high speed in various circumstances, is provided. An electrophotographic photoconductor having a photosensitive layer containing the enamine compound represented by the following general formula (1), for example, the enamine compound represented by the following structural formula (1-1) as a charge transportation substance is mounted to an image forming apparatus and the volume average particle size of the toner contained in a developer 50 housed in a developing device 33 is set to a size from 4 to 7 ?m.Type: GrantFiled: January 27, 2005Date of Patent: November 25, 2008Assignee: Sharp Kabushiki KaishaInventors: Ichiroh Fujii, Takatsugu Obata, Mikio Kakui
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Patent number: 7449269Abstract: The invention provides an electrophotographic photoreceptor capable of producing high quality images even when development is carried out under low electric potential conditions, and also provides an image forming device incorporating such an electrophotographic photoreceptor. In a photosensitive layer 14 of a photoreceptor 1, the mobility of electric charges is 2×10?6 cm2/(V·s) or greater at an electric field intensity E of 1×105 V/cm. Further, the slope ?in equation 1 representing the mobility of electric charges is 5×10?4 or less in an electric field range of 5×104<E<1×105.Type: GrantFiled: January 13, 2005Date of Patent: November 11, 2008Assignee: Sharp Kabushiki KaishaInventor: Hiroshi Sugimura
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Patent number: 7449268Abstract: Polymers of naphthalene tetracarboxylic diimide dimmers are provided. The polymers are of the Formula I wherein the A units are selected from and Formula IX The polymers are suitable for use in the active layer of an imaging member and exhibit properties of both a binder and an electron-transporting material.Type: GrantFiled: May 27, 2005Date of Patent: November 11, 2008Assignee: Xerox CorporationInventors: Timothy P. Bender, John Graham, James M. Duff
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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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Patent number: 7429439Abstract: An electrophotographic photoreceptor of excellent durability having high sensitivity and light responsiveness, not suffering from lowering of the electric characteristics by exposure to light, change of circumstance, or repetitive use, and excellent in the cleaning property and not suffering from lowering of the picture quality of formed images for a long times, in which an enamine compound represented by the general formula (1), for example, an enamine compound represented by the following structural formula (1-1) is incorporated in a photosensitive layer 14, and the surface energy (?) on the surface of the photosensitive layer 14 is set to 20.0 mN/m or more and 35.Type: GrantFiled: November 19, 2004Date of Patent: September 30, 2008Assignee: Sharp Kabushiki KaishaInventors: Koichi Toriyama, Kotaro Fukushima, Takatsugu Obata, Takuya Arimura
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Patent number: 7416824Abstract: According to the present invention, an enamine compound having a specific structure is used as an organic photoconductive material. This enamine compound is obtained based on asymmetrical secondary naphtylamine which is readily available at a lowest price, by introducing phenyl groups containing substituents, as constituents units of the enamine part and presents excellent compatibility with binder resins, will not present detrimental effects such as partial crystallization at film forming and have a high charge mobility. The compound is able to realize highly reliable electrophotographic photoreceptor and an image forming apparatus which present a high electrostatic potential, high sensitivity and high enough light response and are excellent in durability and will not degrade in these characteristics under a low-temperature environment or in a high-speed process and will not lower in these characteristics even due to exposure to light.Type: GrantFiled: May 10, 2004Date of Patent: August 26, 2008Assignee: Sharp Kabushiki KaishaInventors: Akihiro Kondoh, Takatsugu Obata, Kazuya Ishida
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Patent number: 7403735Abstract: An image formation apparatus using an elecrophotographic process for obtaining a high quality image with tone value R2 of equal to or more than 0.98 is provided. The resolution for light-writing is equal to or more than 1200 dpi and/or light-writing is performed based on image data formed by applying halftone processing at a line frequency of equal to or more than 200 lpi. Light-writing means is accomplished with a laser light beam with a beam diameter equal to or less than 35 ?m. The photoconductor includes a charge generating layer containing a charge generating material and a charge transfer layer containing a charge transfer material laminated on a conductive support. The ionization potential of the charge generating material Ip(CG) and ionization potential of the charge transfer material Ip(CT) satisfy the relationship of Ip(CG)?Ip(CT).Type: GrantFiled: January 24, 2003Date of Patent: July 22, 2008Assignee: Ricoh Company, Ltd.Inventors: Kei Yasutomi, Yasuo Suzuki
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Patent number: 7381511Abstract: A photoreceptor including an electroconductive substrate; a photosensitive layer; and optionally a protective layer, wherein an outermost layer thereof includes a filler, an organic compound having an acid value of from 10 to 700 mg KOH/g and at least one compound selected from the group consisting of compounds having the following formulae (1) and (2): wherein R1 (R3) and R2 (R4) independently represent a substituted or an unsubstituted aromatic hydrocarbon group, or a substituted or an unsubstituted alkyl group, and optionally share bond connectivity to form a heterocyclic group including a nitrogen atom; Ar1 (Ar3) and Ar2 (Ar4) independently represent a substituted or a unsubstituted aromatic ring group; k (K) and m (M) independently represent 0 or an integer of from 1 to 3, wherein k (K) and m (M) are not 0 at the same time; and n (n?) represents an integer of from 1 to 3.Type: GrantFiled: June 1, 2004Date of Patent: June 3, 2008Assignee: Ricoh Company, Ltd.Inventors: Takaaki Ikegami, Tomoyuki Shimada, Yasuo Suzuki, Nozomu Tamoto, Hidetoshi Kami, Yuuji Takana