Product Having Overlayer On Radiation-conductive Layer Patents (Class 430/66)
  • Patent number: 7563553
    Abstract: A process for making an electrophotographic photosensitive member is provided by forming a photosensitive layer on an electroconductive support. The photosensitive layer is provided with particularly excellent durability while retaining good electrophotographic performances when formed as a layer comprising a polymerizate of a hole-transporting compound having at least two chain polymerization function groups in its molecule represented by formula (1) below: (P1aAzP2)d)b??(1), wherein A denotes a hole-transporting group, P1 and P2 independently denote a chain polymerization function group and Z denotes a bonding organic group; a, b and d are independently an integer of at least 0 satisfying a+b×d?2 provided that if a?2, plural groups P1 can be identical or different; if b?2, plural groups Z can be identical or different; and if b×d?2, plural groups P2 can be identical or different.
    Type: Grant
    Filed: January 26, 2007
    Date of Patent: July 21, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshihiro Kikuchi, Akio Maruyama, Hiroki Uematsu
  • Patent number: 7560205
    Abstract: A photoconductive imaging including at least a substrate, a charge generating layer, a charge transport layer, and an overcoat layer. The overcoat layer includes a crosslinked product of at least a phenolic resin and a phenol compound.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: July 14, 2009
    Assignee: Xerox Corporation
    Inventors: Yu Qi, Nan-Xing Hu, Cheng-Kou Hsiao
  • Patent number: 7560209
    Abstract: An electrophotographic image forming apparatus, comprises an electrophotographic photoreceptor; an image forming section for forming a toner image on a surface of the electrophotographic photoreceptor; an intermediate transfer member; a first transferring section for transferring the toner image formed on the surface of the electrophotographic photoreceptor to a surface of the intermediate transfer member; and a second transferring section for transferring the toner image transferred on the surface the intermediate transfer member to a recording medium; wherein the electrophotographic photoreceptor comprises a surface layer forming the surface thereof and containing particles having a number average primary particle diameter of 1 to 300 nm and the surface of the electrophotographic photoreceptor has a hardness of 200 to 350 N/mm2 in universal hardness which is lower than the hardness in universal hardness of the surface of the intermediate transfer member.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: July 14, 2009
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Shigeaki Tokutake, Takao Fukaya, Tsuyoshi Shimoda, Shinichi Hamaguchi
  • Patent number: 7556903
    Abstract: An electrophotographic photoreceptor including an electroconductive substrate and a photosensitive layer overlying the electroconductive substrate. An outermost layer of the electrophotographic photoreceptor is a crosslinked layer including a radical polymerizing monomer having three or more functional groups without a charge transporting structure. The outermost layer also includes a radical polymerizing compound having one functional group with a charge transporting structure and a reactive silicone compound having a radical polymerizing functional group.
    Type: Grant
    Filed: September 20, 2004
    Date of Patent: July 7, 2009
    Assignee: Ricoh Company Limited
    Inventors: Yoshiki Yanagawa, Hiroshi Ikuno, Hongguo Li, Kazukiyo Nagai, Hiroshi Tamura, Tetsuro Suzuki
  • Patent number: 7556901
    Abstract: An electrophotographic photosensitive member has a surface having a plurality of depressed portions, having a major-axis diameter Rpc of 0.1 to 10 ?m, a minor-axis diameter Lpc of 0.1 to 10 ?m and a deepest-part to opening distance Rdv of 0.1 to 10 ?m. Where the surface is equally divided into 4 regions in the rotational direction, which are then equally divided into 25 regions in the direction falling at right angles with the rotational direction, to obtain 100-spot regions A in total, and, in each thereof, square regions B of 50 ?m each per side one side of which is parallel to the rotational direction are provided and the regions B are each equally divided into 500 zones by straight lines parallel to the rotational direction, 400 to 499 lines among the straight lines pass through the depressed portions in each of the regions B.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: July 7, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Anezaki, Harunobu Ogaki, Hiroki Uematsu, Masataka Kawahara, Atsushi Ochi, Kyoichi Teramoto, Akira Shimada, Akio Maruyama, Toshihiro Kikuchi, Akio Koganei, Takayuki Sumida, Hirotoshi Uesugi
  • Patent number: 7556902
    Abstract: The object of the invention is to provide a novel aromatic polyester resin useful as a binder resin or charge transporting polymer for an organic photoconductor and an electrophotographic photoconductor having high sensitivity and high durability produced using the above-noted novel aromatic polyester resin. For this object, the invention provides an aromatic polyester resin which has a recurring unit represented by the following Formula (I) and an electrophotographic photoconductor produced using the above-noted aromatic polyester resin. wherein R1 represents any one of a hydrogen atom, an unsubstituted or substituted alkyl group and an unsubstituted or substituted aryl group; Ar1 represents an unsubstituted or substituted aryl group; Ar2 and Ar3 may be the same as or different from each other and represent respectively an unsubstituted or substituted arylene group; and W represents an unsubstituted or substituted divalent aromatic group.
    Type: Grant
    Filed: August 24, 2005
    Date of Patent: July 7, 2009
    Assignee: Ricoh Company, Ltd.
    Inventor: Masayuki Shoshi
  • Patent number: 7553594
    Abstract: An electrophotographic photosensitive member having excellent electrophotographic properties, a method of manufacturing the electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member are provided. The surface layer of the electrophotographic photosensitive member includes a polymer having a specific repeating structural unit and fluorine-atom-containing resin particles. The fluorine-atom-containing particles in the surface layer are dispersed so as to be provided with particle sizes almost up to those of primary particles.
    Type: Grant
    Filed: April 15, 2008
    Date of Patent: June 30, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Harunobu Ogaki, Nobumichi Miki, Kazunori Noguchi, Nobuo Kosaka
  • Publication number: 20090162766
    Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, and at least one charge transport layer comprised of at least one charge transport component, and an overcoat, and where the overcoat contains at least one of ketal. In embodiments the overcoat layer may include ?-hydroxyketone, ?-diketone, or mixtures thereof.
    Type: Application
    Filed: December 20, 2007
    Publication date: June 25, 2009
    Applicant: XEROX CORPORATION
    Inventors: Jin Wu, John F. Yanus, Kenny-Tuan Dinh, Kent J. Evans
  • Patent number: 7550238
    Abstract: An image forming process using an electrostatic latent image carrier containing a support and a photoconductive layer including: a charge generating layer, a charge transportable layer, and a cross-linked charge transportable layer which are disposed on the support in this order and the cross-linked charge transportable layer comprises a compound produced by the reaction between a trifunctional or more functional radical-polymerizable compound having no charge transportable structure, and a monofunctional radical-polymerizable compound having a charge transportable structure, and a toner produced in the form of particles by producing an adhesive base material through reacting a compound having an active hydrogen group with a polymer which can be reacted with the above-noted compound having an active hydrogen group in an aqueous medium.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: June 23, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Kohichi Ohshima, Yasuo Suzuki, Tetsuro Suzuki, Michitaka Sasaki
  • Patent number: 7541125
    Abstract: An embodiment may be an organic photoreceptor, which comprises a conductive support; a photosensitive layer provided on the conductive support; and a surface layer containing a binder and a fluorine-containing resin fine particle having a number average primary particle diameter between about 0.02 ?m and about 0.20 ?m and a crystallinity of less than 90% and a binder resin; wherein a contact angle of the surface layer for water is 90° or more and a dispersion of the contact angle is within ±2.0°.
    Type: Grant
    Filed: February 18, 2005
    Date of Patent: June 2, 2009
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Keiichi Inagaki, Nobuaki Kobayashi, Shigeaki Tokutake
  • Patent number: 7541123
    Abstract: An imaging member includes an electrically conductive layer; a positive charge blocking layer, an imaging layer, and an undercoat layer. The undercoat layer is intermediate the imaging layer and the electrically conductive layer. The undercoat layer includes a film forming polymer and a particulate material dispersed therein. The particulate material supports a charge blocking material thereon.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: June 2, 2009
    Assignee: Xerox Corporation
    Inventors: Satchidanand Mishra, Robert C. U. Yu, Kathleen M. Carmichael
  • Publication number: 20090136256
    Abstract: In an electrophotographic photosensitive member having a support, a conductive layer formed on the support, an intermediate layer formed on the conductive layer, and a photosensitive layer formed on the intermediate layer, the conductive layer has been formed by using a conductive layer coating fluid which contains TiO2 particles coated with oxygen deficient SnO2 having an average particle diameter of from 0.20 ?m or more to 0.60 ?m or less, and has a volume resistivity of from more than 8.0×108 ?cm to 1.0×1011 ?cm or less. The electrophotographic photosensitive member can keep charging lines from occurring.
    Type: Application
    Filed: March 24, 2006
    Publication date: May 28, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kazushige Nakamura, Hidetoshi Hirano, Hirotoshi Uesugi, Hirofumi Kumoi, Shinji Takagi, Yukihiro Abe, Junpei Kuno, Daisuke Miura
  • Publication number: 20090136861
    Abstract: 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: Application
    Filed: May 18, 2007
    Publication date: May 28, 2009
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Teruyuki Mitsumori, Kozo Ishio, Hiroe Fuchigami
  • Patent number: 7537872
    Abstract: An image bearing member including an electroconductive substrate, a charge blocking layer disposed overlying the electroconductive substrate, a moire prevention layer disposed overlying the charge blocking layer, and a photosensitive layer disposed overlying the moire prevention layer. The charge blocking layer contains N-alkoxymethylized nylon and optionally at least one of an aliphatic dicarboxylic acid and an aliphatic tricarboxylic acid. The moire prevention layer contains a titanium oxide having a purity not less than 99.0% and a cross-linking resin.
    Type: Grant
    Filed: April 13, 2006
    Date of Patent: May 26, 2009
    Assignee: Ricoh Company Limited
    Inventors: Naohiro Toda, Yasuyuki Yamashita, Takeshi Orito
  • Patent number: 7537873
    Abstract: Positive-charge injection-related ghosting of images in electrophotographic processes is addressed by electrophotographic photoreceptors that include a positive-charge injection preventing layer that includes one or more positive-charge-injection preventing compounds. In addition, processes are provided for preventing positive charge injection, in which the processes include a step of applying a positive-charge injection preventing composition to an electrophotographic photoreceptor in which the positive-charge injection preventing composition includes one or more positive-charge-injection preventing compound.
    Type: Grant
    Filed: November 6, 2006
    Date of Patent: May 26, 2009
    Assignee: Xerox Corporation
    Inventors: John Graham, Zoran D. Popovic, Johann Junginger
  • Publication number: 20090130576
    Abstract: An electrophotographic photosensitive member having excellent electrophotographic properties, a method of manufacturing the electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member are provided. The surface layer of the electrophotographic photosensitive member includes a polymer having a specific repeating structural unit and fluorine-atom-containing resin particles. The fluorine-atom-containing particles in the surface layer are dispersed so as to be provided with particle sizes almost up to those of primary particles.
    Type: Application
    Filed: January 14, 2009
    Publication date: May 21, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Harunobu Ogaki, Nobumichi Miki, Kazunori Noguchi, Nobuo Kosaka
  • Patent number: 7534538
    Abstract: A coating liquid for an intermediate layer of an electrophotographic photoconductor comprises at least one of alcohol solvents; and N-methoxymethylated nylon, in which the N-methoxymethylated nylon has solution viscosity within a range from 43 mPa·s to 50 mPa·s when dissolving into methanol at 30° C. in a concentration of 20% by mass.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: May 19, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuya Niimi, Maiko Kondo, Nozomu Tamoto, Katsuichi Ohta
  • Patent number: 7531278
    Abstract: An electrostatic latent image bearer, comprising a substrate; a photosensitive layer overlying the substrate; and a protective layer overlying the photosensitive layer, wherein the protective layer includes a binder resin comprising a polyol, a polyisocyanate and an organic silicon compound having a hydroxyl or a hydrolyzable group.
    Type: Grant
    Filed: July 14, 2006
    Date of Patent: May 12, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Akihiro Sugino, Takaai Ikegami, Takeshi Takada
  • Patent number: 7529504
    Abstract: An image forming apparatus has an organic photoconductor having a surface layer containing fluorine-containing resin particles whose number average primary particle size is not less than 0.02 ?m and is less than 0.20 ?m; a charging device to charge by bring an charging member in contact with the organic photoconductor; a latent image forming device to for a latent image on the organic photoconductor; a developing device to visualize the latent image with toner and to form a toner image on the organic photoconductor; and a transferring device to transfer the toner onto a transfer material.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: May 5, 2009
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Keiichi Inagaki, Shigeaki Tokutake
  • Patent number: 7527902
    Abstract: An imaging member containing a substrate, and an outer layer containing solid and liquid lubricants, and an image forming apparatus for forming images on a recording medium including the imaging member above, a development component to apply a developer material to said charge-retentive surface to develop said electrostatic latent image to form a developed image on said charge-retentive surface; a transfer component for transferring said developed image from said charge-retentive surface to another member or a copy substrate; and a fusing member to fuse said developed image to said copy substrate.
    Type: Grant
    Filed: July 28, 2005
    Date of Patent: May 5, 2009
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Geoffrey M T. Foley, Jodie L. Watson, Liang-Bih Lin, Edward C. Savage, Robert P. Altavela, Linda Ferrarese, Marc J. Livecchi
  • Patent number: 7524597
    Abstract: Imaging members useful in electrostatographic apparatuses, including printers, copiers, other reproductive devices, and digital apparatuses. More particularly, imaging members having nano-sized particles serving as fillers dispersed or contained in one or more layers of the imaging member that provide for increased mechanical strength and improved wear.
    Type: Grant
    Filed: June 22, 2006
    Date of Patent: April 28, 2009
    Assignee: Xerox Corporation
    Inventors: Satchidanand Mishra, Yuhua Tong, Kathleen Carmichael, Chieh-Min Cheng, Kenny-tuan Dinh, Susan Vandusen, Cindy Chen, Huoy-Jen Yuh, Lanhui Zhang
  • Patent number: 7524598
    Abstract: Disclosed is an electrophotographic photoreceptor. The electrophotographic photoreceptor includes an organic photoreception layer that is formed on a conductive base and includes at least polycarbonate. An outermost surface of the organic photoreception layer has been subjected to surface treatment using plasma of gas including hydrogen, or hydrogen and nitrogen.
    Type: Grant
    Filed: November 13, 2006
    Date of Patent: April 28, 2009
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takeshi Iwanaga, Shigeru Yagi
  • Patent number: 7517625
    Abstract: An image forming apparatus including: an electrophotographic photoreceptor; a non-contact charger located close to the electrophotographic photoreceptor, charging the electrophotographic photoreceptor; an irradiator irradiating the electrophotographic photoreceptor to form an electrostatic latent image thereon; an image developer developing the electrostatic latent image with a toner to form a toner image on the electrophotographic photoreceptor; and a transferer transferring the toner image onto a transfer material, wherein the electrophotographic photoreceptor comprises: an electroconductive substrate; a charge generation layer located overlying the electroconductive substrate; a charge transport layer located overlying the charge generation layer; and a crosslinked charge transport layer, located overlying the charge transport layer, wherein the crosslinked charge transport layer is formed by hardening a radical polymeric monomer having three or more functional groups without a charge transport structu
    Type: Grant
    Filed: September 6, 2005
    Date of Patent: April 14, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuo Suzuki, Michitaka Sasaki, Tetsuro Suzuki, Kohichi Ohshima
  • Patent number: 7517928
    Abstract: Siloxane-containing materials that have been prepared by a sol-gel method and polymeric binder materials from interpenetrating networks. Silicon-containing layers including such interpenetrating networks are provided. Methods for preparing interpenetrating networks and silicon-containing layers including interpenetrating networks are also provided. In addition, photoreceptors and image-forming apparatus including such silicon-containing layers are provided.
    Type: Grant
    Filed: November 7, 2005
    Date of Patent: April 14, 2009
    Assignee: Xerox Corporation
    Inventors: Timothy P Bender, Barkev Keoshkerian, John F Graham, Yvan Gagnon, Cheng-Kuo Hsiao, Nan-Xing Hu
  • Publication number: 20090092916
    Abstract: An electrophotographic photoreceptor includes an electrically conductive substrate, an organic photosensitive layer and a surface layer laminated in this order. The surface layer includes at least gallium (Ga) and oxygen (O) as constituent elements thereof, and has a thickness of 0.2 ?m to 1.5 ?m, and a microhardness of 2 GPa to 15 GPa.
    Type: Application
    Filed: June 24, 2008
    Publication date: April 9, 2009
    Applicant: FUJI XEROX CO., LTD
    Inventors: Takeshi Iwanaga, Shigeru Yagi, Nobuyuki Torigoe
  • Publication number: 20090081569
    Abstract: Provided is an electrophotographic photosensitive body having a photosensitive layer on a conductive base, in which at least the outermost layer thereof contains particles having a double structure composed of a core member and a shell member having a lager rubber hardness than the core member. The electrophotographic photosensitive body has excellent mechanical strength such as wear resistance, abrasion resistance, and scratch resistance as well as excellent electrophotographic characteristics such as cleaning property for a long time period.
    Type: Application
    Filed: March 15, 2006
    Publication date: March 26, 2009
    Inventors: Hideyuki Miyamoto, Takaaki Hikosaka
  • Patent number: 7498110
    Abstract: There is provided an electrophotographic photosensitive member used in an electrophotographic apparatus which meets energy saving and higher image quality. The electrophotographic photosensitive member has excellent potential properties, and can suppress the image quality degradation caused by interference. The electrophotographic photosensitive member of the present invention including on a conductive substrate at least a photoconductive layer mainly composed of amorphous silicon, a surface layer, and at least one intermediate layer interposed between the photoconductive layer and the surface layer, wherein the surface layer contains a metal fluoride (exclusive of silicon fluoride) and the intermediate layer contains a metal oxide.
    Type: Grant
    Filed: June 22, 2005
    Date of Patent: March 3, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takahisa Taniguchi, Kazuyoshi Akiyama
  • Publication number: 20090042117
    Abstract: A conductive member for use in an image forming apparatus, a process cartridge including the conductive member as a charging member, an image forming apparatus including the process cartridge, a charging member, and a process cartridge and an image forming apparatus including the charging member. The conductive member includes a surface coated with a powder lubricant. The charging member includes a conductive member and a powder lubricant applied to a surface of the conductive member.
    Type: Application
    Filed: July 28, 2008
    Publication date: February 12, 2009
    Applicant: RICOH COMPANY, LTD
    Inventors: Makoto NAKAMURA, Yutaka Narita, Tadayuki Oshima, Hiroki Furubayashi, Taisuke Tokuwaki
  • Patent number: 7482106
    Abstract: An image forming method comprising steps of forming a toner image by developing by a toner a latent image on a photoreceptor comprised of a layer formed on a substrate, transferring the toner image onto a recording medium on which the toner image is recorded and fixing, wherein the average circular degree of the toner is not less than 0.94, and the toner contains a wax comprising an ester of a carboxylic acid having carbon atoms of not less than 16 or an ester of an alcohol having carbon atoms of not less than 16, and the layer is a layer to be contacted to the toner in the developing step and contains an inorganic fine particles having a number average of primary particle diameter of approximately not less than 1 nm and less than 100 nm.
    Type: Grant
    Filed: March 15, 2004
    Date of Patent: January 27, 2009
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Hideo Yoshizawa, Akihiko Itami
  • Patent number: 7482104
    Abstract: An image forming method, includes: forming a latent electrostatic image on a latent electrostatic image carrier; developing the latent electrostatic image with a toner to thereby form a visible image; transferring the visible image to a recording medium; and fixing the image transferred to the recording medium. The latent electrostatic image carrier includes: a support, a photoconductive layer on the support, and a surface protective layer on the support. The surface protective layer includes a reactant made by cross-linking the following: an electric charge transporting material which comprises a reactive functional group, a cross-linking resin, and a fluorine surfactant. The toner comprises an inorganic fine particle which defines an effective inorganic fine particle amount in a range of 0.8% by mass to 3.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: January 27, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Maiko Kondo, Hidetoshi Kami, Naohiro Toda, Ryoichi Kitajima, Hiroshi Nagame, Narihito Kojima, Yoshiaki Kawasaki
  • Patent number: 7473504
    Abstract: An electrophotographic photoreceptor including an electroconductive substrate; and a photosensitive layer located overlying the electroconductive substrate, wherein an outermost layer of the electrophotographic photoreceptor is a crosslinked layer, including: a urethane oligomer having a radical polymerizing functional group; and a radical polymerizing compound having one functional group with a charge transporting structure, or a radical polymerizing oligomer having a polyester structure; a radical polymerizing compound having three or more functional groups without a charge transporting structure; and a radical polymerizing compound having one functional group with a charge transport structure, and wherein the outermost layer has an elasticity power not less than 41%.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: January 6, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiki Yanagawa, Hiroshi Tamura, Tetsuro Suzuki, Naohiro Toda, Yoshiaki Kawasaki
  • Publication number: 20090004587
    Abstract: A layer on the reverse side of an imaging member provides excellent crack resistance to the imaging layer(s) on the front side. The crack-deterring backing layer can be a laminated self-adhesive, such as tape, or a coating. Because the crack-deterring backing layer is on the reverse side, it does not affect the electrical properties of the imaging member. Overcoat layers may be used whose function is limited to improved scratch resistance.
    Type: Application
    Filed: June 26, 2007
    Publication date: January 1, 2009
    Inventors: Mohamed Ismail Abu-Abed, Johann E. Junginger, Hany Aziz, Greg McGuire
  • Patent number: 7470493
    Abstract: Provided are a silane-phenol compound, a crosslinked siloxane outmost protective layer thereof, and an electrophotographic imaging member such as photoreceptor. The silane-phenol compound comprises (i) a phenol group and (ii) a silane group selected from the group consisting of alkoxysilyl, arylalkoxysilyl, aryloxysilyl, alkylaryloxysilyl, and combination thereof. The crosslinked siloxane outmost protective layer comprises the product of hydrolysis and condensation of a silanized hole transport compound and the silane-phenol compound. The crosslinked protective outmost layer may be used to manufacture an electrophotographic imaging member such as photoreceptor with improved properties such as image quality and cleanability, etc.
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: December 30, 2008
    Assignee: Xerox Corporation
    Inventors: Yu Qi, Nan-Xing Hu, Yvan Gagnon, Cheng-Kuo Hsiao, Ah-Mee Hor
  • Publication number: 20080318147
    Abstract: An objective is to provide an electrophotographic photoreceptor having a protective layer in which no unevenness is generated in a coated layer even though a coating solution containing a large addition amount of metal oxide is coated, mechanical strength of a protective layer is high; productivity is high with long life of the coating solution because of no sedimentation of metal oxide, electrical resistivity and mechanical strength are satisfactory, and metal oxide generating no coated layer defect together with no light scattering caused by dispersion failure is dispersed, and also to provide an image forming method and an image forming apparatus employing the electrophotographic photoreceptor. Also disclosed is an electrophotographic photoreceptor possessing a conductive support, at least a photosensitive layer and a protective layer, wherein the protective layer comprises rutile type titanium dioxide and anatase type titanium dioxide.
    Type: Application
    Filed: March 13, 2008
    Publication date: December 25, 2008
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Toshiyuki FUJITA, Hirofumi HAYATA, Masahiko KURACHI, Kunihiro OGURA
  • Publication number: 20080311499
    Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer, located overlying the electroconductive substrate; and a crosslinked resin surface layer, located overlying the photo sensitive layer, wherein the crosslinked resin surface layer includes a crosslinked body of trimethylolpropanetriacrylate, isocyanate including a radical polymerizable functional group and a heat or a light-curable charge transport material.
    Type: Application
    Filed: June 4, 2008
    Publication date: December 18, 2008
    Applicant: RICOH COMPANY, LTD.
    Inventors: Hidetoshi KAMI, Tetsuro Suzuki, Hiroshi Tamura, Hiroshi Ikuno, Yukio Fujiwara, Takafumi Iwamoto
  • Publication number: 20080311496
    Abstract: An image forming medium includes a substrate; an imaging layer including an imaging material coated on said substrate, wherein the imaging material exhibits a reversible transition between a colorless state and a colored state; and a protective layer over the imaging layer, the protection layer including dipolar molecules that can be reversibly switch between a UV light transmission state and a UV light absorption state, wherein the dipolar molecules in their random orientation absorb in substantially the same spectral region as the imaging material in its un-imaged state, and wherein the imaging layer is imageable by ultraviolet light when the dipolar molecules are in the UV light transmission state, but the imaging layer is substantially not imageable by ultraviolet light when the dipolar molecules are in the UV light absorption state.
    Type: Application
    Filed: June 13, 2007
    Publication date: December 18, 2008
    Applicant: XEROX CORPORATION
    Inventors: Gabriel IFTIME, Hadi K. MAHABADI, Peter M. KAZMAIER
  • Publication number: 20080298840
    Abstract: An electrophotographic photoreceptor including a conductive substrate and a photosensitive layer located overlying the conductive substrate which includes a naphthalenetetracarboxylic acid diimide derivative having a specific formula; and an image forming apparatus and a process cartridge using the electrophotographic photoreceptor are provided.
    Type: Application
    Filed: June 3, 2008
    Publication date: December 4, 2008
    Inventor: Tomoyuki SHIMADA
  • Publication number: 20080286672
    Abstract: The invention relates to an electrophotographic photoreceptor in which protrusions from the surface of the photoreceptor are partly or completely covered by a resin. The effect of such resin covering is to reduce toner deposition, thereby reducing or eliminating spotting defects in images formed using the electrophotographic photoreceptor. The invention further relates to an image-forming apparatus incorporating such an electrophotographic photoreceptor.
    Type: Application
    Filed: April 24, 2008
    Publication date: November 20, 2008
    Applicant: KYOCERA CORPORATION
    Inventor: Yoshiaki FUJIWARA
  • Patent number: 7449272
    Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; and a photosensitive layer overlying the electroconductive substrate, which includes a crosslinked layer at the surface thereof, wherein the crosslinked layer is formed by a method including: coating a coating liquid, which includes a solvent; a radical polymerizing monomer having three or more functional groups and no charge transportable structure; and a radical polymerizing compound having a charge transportable structure on the photosensitive layer; and irradiating the coating liquid to be hardened while the surface of the photosensitive layer is controlled to have a temperature not higher than a boiling point of the solvent.
    Type: Grant
    Filed: November 15, 2005
    Date of Patent: November 11, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiaki Kawasaki, Tetsuro Suzuki, Hiroshi Ikuno, Tetsuya Toshine
  • Publication number: 20080268357
    Abstract: A phthalocyanine composite with high sensitivity and low environmental dependence is provided. It comprises both a at least one phthalocyanine compound expressed by general formula (1) and a at least one phthalocyanine compound expressed by general formula (2): where, in the general formulae (1) and (2), M1 represents at least one arbitrary atom or atomic group that is capable of binding to a phthalocyanine, M2 represents an atom, or an atomic group containing an atom, selected from the second and subsequent periods of the periodic table and capable of binding to a phthalocyanine, M1 and M2 being different in kind from each other, X1-X4 represent, independently of each other, a halogen atom, and a, b, c, and d represent, independently of each other, an integer between 0 and 4 and satisfy a+b+c+d>1.
    Type: Application
    Filed: March 4, 2005
    Publication date: October 30, 2008
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Mitsuo Wada, Kazutaka Ida, Akiteru Fujii
  • Patent number: 7442479
    Abstract: A photoreceptor including at least an electroconductive substrate, and a charge blocking layer, a moiré preventing layer, and a photosensitive layer, which are located overlying the electroconductive substrate in this order, wherein the photosensitive layer includes an azo pigment having a fluorenone skeleton. The photosensitive layer is preferably prepared by coating a coating liquid including a dispersion which is prepared by dispersing the azo pigment in a solvent to an extent such that the average particle diameter of the azo pigment is not greater than 0.3 ?m and the standard deviation of the particle diameter is not greater than 0.2 ?m, followed by filtering with a filter having an effective pore diameter not greater than 5 ?m. An image forming apparatus and a process cartridge including the photoreceptor.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: October 28, 2008
    Assignee: Ricoh Company, Limited
    Inventor: Tatsuya Niimi
  • Publication number: 20080260427
    Abstract: An electrophotographic photoreceptor is provided that suppresses the occurrence of non-uniformity of in-plane image density caused by a superfluous residual potential and defects such as cracks in an organic photoreceptor having a protective layer made of an inorganic thin film, and that simultaneously exhibits high durability and good electrical properties, and a process cartridge and an image forming apparatus including the same are provided. An electrophotographic photoreceptor includes an organic photosensitive layer and one or more inorganic thin film layers disposed in this order on a conductive substrate, wherein among the one or more inorganic thin film layers at least an inorganic protective layer disposed directly on the organic photosensitive layer has cracks scattered at intervals from about 1 ?m to about 10 mm.
    Type: Application
    Filed: February 27, 2008
    Publication date: October 23, 2008
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takeshi IWANAGA, Shigeru YAGI
  • Patent number: 7439002
    Abstract: A silicone overcoat (SOC) layer having a crosslinked polysiloxane composition comprising a perfluoropolyether segment are disclosed. The polysiloxane composition is the product of the hydrolysis and condensation of a SOC formulation comprising a perfluoropolyether compound, an aromatic silicon-containing compound, and a silicon-containing hole transport compound. An electrophotographic imaging member having such a SOC layer has improved properties.
    Type: Grant
    Filed: July 12, 2005
    Date of Patent: October 21, 2008
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, John Graham, Ah-Mee Hor, Yvan Gagnon, Cheng-Kuo Hsiao
  • Publication number: 20080254379
    Abstract: The present invention provides an electrophotographic photoreceptor, a process cartridge and an image forming apparatus including the same, wherein the electrophotographic photoreceptor prevents the generation of excessive residual potential, which usually occurs on a photoreceptor having a protective layer composed of an inorganic material, and achieves both of high durability and favorable electrical characteristics. An electrophotographic photoreceptor composed of a conductive substrate having thereon a photosensitive layer and a surface layer formed in this order, wherein the total composition ratio of a group 13 element, oxygen, and hydrogen to the total element content in the surface layer is 0.95 or more, and the abundance ratio of the oxygen to the group 13 element is from 1.1 to 1.5.
    Type: Application
    Filed: March 19, 2008
    Publication date: October 16, 2008
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takeshi IWANAGA, Shigeru YAGI
  • Patent number: 7429439
    Abstract: 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: Grant
    Filed: November 19, 2004
    Date of Patent: September 30, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Toriyama, Kotaro Fukushima, Takatsugu Obata, Takuya Arimura
  • Patent number: 7429440
    Abstract: An electrophotographic photoreceptor includes a surface layer having a contact angle of 90 to 130° on a cylindrical conductive substrate having a cylindricity of 5 to 40 ?m.
    Type: Grant
    Filed: August 25, 2004
    Date of Patent: September 30, 2008
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Masao Asano, Kageyuki Tomoyori
  • Patent number: 7427440
    Abstract: An imaging member containing a substrate, and an outer layer containing a polyether lubricant, and an image forming apparatus for forming images on a recording medium including the imaging member above, a development component to apply a developer material to said charge-retentive surface to develop said electrostatic latent image to form a developed image on said charge-retentive surface; a transfer component for transferring said developed image from said charge-retentive surface to another member or a copy substrate; and a fusing member to fuse said developed image to said copy substrate.
    Type: Grant
    Filed: July 28, 2005
    Date of Patent: September 23, 2008
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Geoffrey M T. Foley, Liang-Bih Lin, Edward C. Savage, Robert P. Altavela, Marc J. Livecchi
  • Publication number: 20080227008
    Abstract: An object of the present invention is to provide an electrophotographic photoconductor having an extremely low increase in friction coefficient and wear, while also having superior cleanability even after long-term or large-volume printing, and to provide an electrophotographic apparatus for forming an image using a polymerization toner without providing a unit for externally supplying a lubricant to a photoconductor. Namely, the present invention provides an electrophotographic photoconductor having a photosensitive layer and a crosslinked resin surface layer over a conductive substrate, wherein the crosslinked resin surface layer at least contains trimethylolpropane triacrylate, a dimethylpolysiloxane having a radically polymerizable functional group, and lubricating fine particles.
    Type: Application
    Filed: March 12, 2008
    Publication date: September 18, 2008
    Inventors: Hidetoshi Kami, Tetsuro Suzuki, Hiroshi Tamura, Hiroshi Ikuno, Yukio Fujiwara, Takafumi Iwamoto
  • Publication number: 20080220355
    Abstract: An image carrier includes a photosensitive layer which carries a latent image, and a lubricant-coated layer formed on a surface of the photosensitive layer, and the lubricant-coated layer is made of a mixture containing a melaminecyanurate, and a polyimide or a silicone resin.
    Type: Application
    Filed: March 6, 2008
    Publication date: September 11, 2008
    Applicant: Ricoh Company, Ltd.
    Inventors: Sumio Kamoi, Yuuya Nakatani, Wataru Kikuta, Hiroshi Itoh
  • Publication number: 20080220354
    Abstract: The surface of a photoconductor is coated with a surface protection layer comprising a cured material of a fluorine-containing photo-curing composition containing fluorinated alkyl group-containing (meth)acrylate and a photopolymerization initiator, and the surface protection layer has a fluorine atom content of 8.5 to 20% by mass.
    Type: Application
    Filed: October 16, 2007
    Publication date: September 11, 2008
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Nobuhiro MIYAKAWA, Shinji YASUKAWA, Tomotake HIRAGA