Substituted Patents (Class 430/72)
  • Publication number: 20030235771
    Abstract: A single layered electrophotographic photoreceptor includes a photosensitive layer having at least a charge generating material, a hole transporting material, an electron transporting material, and a binder on a conductive support. The photosensitive layer includes a peculiar charge transfer complex (CT-complex) formed by the hole transporting material and the electron transporting material.
    Type: Application
    Filed: June 4, 2003
    Publication date: December 25, 2003
    Applicant: SAMSUNG Electronics Co., Ltd.
    Inventors: Saburo Yokota, Hwan-Koo Lee, Kyung-Yol Yon, Beom-Jun Kim, Nam-Jeong Lee
  • Publication number: 20030232263
    Abstract: The present invention relates to an electrophotographic photosensitive member having a support and provided thereon a photosensitive layer. The photosensitive layer contains a high-molecular weight charge-transporting material having a specific repeating structural unit. The high-molecular weight charge-transporting material has a weight-average molecular weight Mw of 1,500 or more and an energy level of highest occupied molecular orbital, EHOMO, of from −8.3 eV or more to −8.0 eV or less as found by semiempirical molecular-orbital calculation. The present invention also relates to a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member.
    Type: Application
    Filed: April 25, 2003
    Publication date: December 18, 2003
    Inventors: Harunobu Ogaki, Akira Yoshida, Takakazu Tanaka, Itaru Takaya, Yuka Ishiduka
  • Publication number: 20030232264
    Abstract: Improved organophotoreceptors comprise:
    Type: Application
    Filed: May 7, 2003
    Publication date: December 18, 2003
    Inventors: Zbigniew Tokarski, Nusrallah Jubran, Vytautas Getautis, Edmundas Montrimas, Maryte Daskeviciene, Valentas Gaidelis, Vygintas Jankauskas
  • Publication number: 20030211413
    Abstract: A photoconductive imaging member comprised of a supporting substrate, and thereover a single layer comprised of a mixture of a photogenerator component, a charge transport component, an electron transport component, and a polymer binder, and wherein the photogenerating component is a pigment.
    Type: Application
    Filed: May 10, 2002
    Publication date: November 13, 2003
    Applicant: Xerox Corporation.
    Inventors: Liang-Bin Lin, Andronique Ioannidis, Ah-Mee Hor, Harold F. Hammond, Anderw R. Melnyk, James M. Markovics, James M. Duff, Timothy P. Bender, Richard H. Nealey, Cindy C. Chen, Linda L. Ferrarese, Kenny-Tuan T. Dinh
  • Publication number: 20030203297
    Abstract: This invention relates to a novel organophotoreceptor that includes:
    Type: Application
    Filed: March 6, 2003
    Publication date: October 30, 2003
    Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski
  • Publication number: 20030203298
    Abstract: An electrophotographic photoreceptor having a photosensitive layer containing, as a charge transporting material, at least one indane compound of the formula (1), 1
    Type: Application
    Filed: September 26, 2002
    Publication date: October 30, 2003
    Applicant: Hodogaya Chemical Co., Ltd.
    Inventors: Katsumi Abe, Chieko Inayoshi, Masaki Ohkubo, Mitsutoshi Anzai, Yasuo Murakami
  • Publication number: 20030198880
    Abstract: This invention relates to a novel organophotoreceptor that includes:
    Type: Application
    Filed: January 22, 2003
    Publication date: October 23, 2003
    Applicant: SAMSUNG Electronics Co. Ltd.
    Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski, Alan R. Katritzky, Ritu Jain, Rexiat Maimait
  • Patent number: 6608228
    Abstract: Disclosed are highly efficient multiphoton absorbing compounds and methods of their use. The compounds generally include a bridge of pi-conjugated bonds connecting electron donating groups or electron accepting groups. The bridge may be substituted with a variety of substituents as well. Solubility, lipophilicity, absorption maxima and other characteristics of the compounds may be tailored by changing the electron donating groups or electron accepting groups, the substituents attached to or the length of the pi-conjugated bridge. Numerous photophysical and photochemical methods are enabled by converting these compounds to electronically excited states upon simultaneous absorption of at least two photons of radiation. The compounds have large two-photon or higher-order absorptivities such that upon absorption, one or more Lewis acidic species, Lewis basic species, radical species or ionic species are formed.
    Type: Grant
    Filed: April 15, 1999
    Date of Patent: August 19, 2003
    Assignee: California Institute of Technology
    Inventors: Brian Cumpston, Matthew Lipson, Seth R. Marder, Joseph W. Perry
  • Publication number: 20030138712
    Abstract: An organophotoreceptor that includes:
    Type: Application
    Filed: November 6, 2002
    Publication date: July 24, 2003
    Applicant: SAMSUNG Electronics Co. Ltd.
    Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski, Alan R. Katrizky, Ritu Jain, Anatoliy Vakulenko
  • Publication number: 20030104294
    Abstract: An organophotoreceptor that includes:
    Type: Application
    Filed: September 13, 2002
    Publication date: June 5, 2003
    Applicant: SAMSUNG Electronics Co. Ltd.
    Inventors: Kam W. Law, Nusrallah Jubran, Zbigniew Tokarski, Alan R. Katritzky, Ritu Jain, Rexiat Maimait, Anatoliy V. Vakulenko
  • Patent number: 6500592
    Abstract: Disclosed is an electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the substrate, the photosensitive layer containing a quinone derivative of the formula (1) and/or (2): (R1, R2, R6 and R7 are alkyl; R3 and R8 are alkyl, alkoxy, aryl, aralkyl, hydrogen or atom; R4 and R5 are alkyl, alkoxy, aryl, aralkyl, hydrogen or halogen, or form a ring by binding each other; X is halogen; m is 1 to 4, n and p are 1 to 4.) The photosensitive material has high sensitivity.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: December 31, 2002
    Assignee: Kyocera Mita Corporation
    Inventor: Fumio Sugai
  • Patent number: 6485873
    Abstract: A biphenyl derivative is included in a photosensitive layer of an electrophotographic photoconductor. The electrophotographic photoconductor includes a single-layer photosensitive layer coated on a conductive substrate. The photosensitive layer includes a resin binder, a charge generation substance, a hole transport substance, and an electron transport substance. An electrophotographic apparatus using such an electrophotographic photoconductor has excellent electrical characteristics in a positive chargine system and is stable in repeated use.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: November 26, 2002
    Assignee: Fuji Electric Imaging Device Co., Ltd.
    Inventors: Kenichi Ohkura, Seizou Kitagawa, Masaru Takeuchi
  • Patent number: 6465143
    Abstract: An electrophotographic photosensitive member capable of forming images with less defects, such as ghost, while retaining a high photo-sensitivity, is provided. The photosensitive member includes a support and a photosensitive layer disposed on the support, wherein said photosensitive layer contains a phthalocyanine pigment and an azo calix[n]arene compound represented by the formula (1) below: wherein n denotes an integer of 4-8; a number (n) of R1 independently denote a hydrogen atom or an alkyl group capable of having a substituent and including at least one alkyl group capable of having a substituent; a number (2n) of R2 independently denote a hydrogen atom or an alkyl group capable of having a substituent; and a number (n) of Ar independently denote a monovalent group selected from an aromatic hydrocarbon ring group capable of having a substituent, a heterocyclic ring group capable of having a substituent, and a combination of these groups capable of having a substituent.
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: October 15, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masato Tanaka, Hideki Anayama, Hidetoshi Hirano, Kan Tanabe, Kazue Asakura, Atsushi Fujii
  • Publication number: 20020119385
    Abstract: Disclosed is a single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer made of a binder resin containing at least an electric charge generating material and an electric charge transferring material, which is formed on the conductive substrate, wherein an oxygen transmission rate of the binder resin is not more than 35 cc·mm/m2·day·atom, wherein it is preferred that a mobility at an electric field strength of 5×105 V/cm of the hole transferring material is not less than 5×10−6 cm2/V/sec and a solid content of the electric charge transferring material is not less than 30% by weight and not more than 50% by weight based on the whole solid content; said electrophotosensitive material has good ozone resistance and does not cause defects such as image black belt due to lowering of the charge capability, an ozone of which is 5.0 ppm at most, and is also superior in sensitivity and wear resistance.
    Type: Application
    Filed: December 12, 2001
    Publication date: August 29, 2002
    Inventors: Jun Azuma, Yukimasa Watanabe, Hisakazu Honma, Ayako Yashima, Maki Uchida, Eiichi Miyamoto
  • Publication number: 20020102484
    Abstract: The invention relates to an electrophotosensitive material comprising an organic photosensitive layer and an inorganic surface protective layer, wherein at least an outermost part of the organic photosensitive layer contains any one of the compounds represented by formulas (1) to (4).
    Type: Application
    Filed: September 18, 2001
    Publication date: August 1, 2002
    Inventors: Eiichi Miyamoto, Yoshio Inagaki, Hideaki Fukunaga
  • Patent number: 6395439
    Abstract: The present invention relates to a naphthoquinone derivative of the formula (1): wherein R1 and R2 are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 6 alkyl group, and the electrophotosensitive material comprises a conductive substrate and a photosensitive layer provided on the conductive substrate, wherein the photosensitive layer contains the naphthoquinone derivative (1).
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: May 28, 2002
    Assignee: Kyocera Mita Corporation
    Inventors: Fumio Sugai, Nobuko Akiba
  • Patent number: 6383698
    Abstract: The present invention relates to an electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the substrate, the photosensitive layer containing a quinone derivative represented by the general formula (1), (2) or (3): wherein A represents an oxygen atom or a sulfur atom; R1 to R14 are the same or different and each represents an alkyl group or an aryl group; and m and n represent an integer of 0 to 4. The electrophotosensitive material has high sensitivity.
    Type: Grant
    Filed: November 13, 2000
    Date of Patent: May 7, 2002
    Assignee: Kyocera Mita Corporation
    Inventors: Hideki Okada, Masaaki Yokoyama
  • Patent number: 6346355
    Abstract: The present invention relates to an electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the substrate, the photosensitive layer containing a quinone derivative represented by the general formula (1): wherein R represents hydrogen atom or alkyl; Me represents methyl. The electrophotosensitive material has high sensitivity, since quinone derivative (1) has excellent electron acceptability, comparability with binder resin and matching with electric charge generating material.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: February 12, 2002
    Assignee: Kyocera Mita Corporation
    Inventors: Fumio Sugai, Yoshio Inagaki
  • Publication number: 20010038961
    Abstract: The present invention relates to an electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the substrate, the photosensitive layer containing a quinone derivative represented by the general formula (1): 1
    Type: Application
    Filed: March 15, 2001
    Publication date: November 8, 2001
    Inventors: Fumio Sugai, Yoshio Inagaki
  • Patent number: 6228547
    Abstract: Disclosed are novel compounds useful in electrophotographic photoreceptors as charge-transporting materials having good miscibility with binder polymers and capable of forming a thin stable organic film having a high concentration; and an electrophotographic photoreceptor containing the same. The compounds are bis(3,4-methylenedioxyphenylamino) derivatives represented by general formula (1): wherein Ar1 and Ar2 each is an optionally substituted aryl group and Ar3 is a phenylene group or an optionally substituted biphenylene group.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: May 8, 2001
    Assignee: Takasago International Corporation
    Inventors: Tohru Kobayashi, Yoshimasa Matsushima, Yoko Aoki, Mamoru Yamada, Hiroshi Sugiyama, Toshimitsu Hagiwara
  • Patent number: 6187493
    Abstract: The present invention provides an electrophotosensitive material comprising a conductive substrate and a photosensitive layer provided on the conductive substrate, the photosensitive layer comprising a specific hole transferring material and/or electron transferring material and a binding resin of a polyester resin which is a substantially linear polymer obtained by using a specific dihydroxy compound represented by the general formula (1): wherein R1 is an alkylene group having 2 to 4 carbon atoms; and R2, R3, R4 and R5 are the same or different and indicate a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group or an aralkyl group or the like. This photosensitive material is improved in sensitivity, and is also superior in adhesion to conductive substrate as well as mechanical strength such as wear resistance, etc.
    Type: Grant
    Filed: February 10, 1998
    Date of Patent: February 13, 2001
    Assignee: Kyocera Mita Corporation
    Inventors: Masato Katsukawa, Akiyoshi Urano, Ayako Sugase, Mitsuo Ihara, Ichiro Yamazato, Yuka Nakamura
  • Patent number: 6183922
    Abstract: An electrophotographic photosensitive member is disclosed which is comprised of a support and a photosensitive layer provided thereon and is exposed to semiconductor laser light having a wavelength of from 380 nm to 500 nm. The photosensitive layer contains an azo pigment represented by the general formula: Ar—(—N═N—Cp)n.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: February 6, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideyuki Takai, Masato Tanaka, Kan Tanabe
  • Patent number: 6139997
    Abstract: An electrophotographic photosensitive member is formed of a support, and a photosensitive layer disposed on the support. The photosensitive layer is characterized by containing an azo pigment having an organic group represented by formula (1) below: ##STR1## wherein X.sub.1, Z.sub.1, k.sub.1, B, A, R.sub.1 and R.sub.2 are defined in the text. The group of the formula (1) may provide at least one of up to 4 azo-substituents of the azo pigment having an entire structure represented byAr.paren open-st.N.dbd.N--Cp) 1-4,wherein Ar denotes an aromatic or heterocyclic core unit, Cp denotes a coupler residue group, and --(N.dbd.N--Cp) denotes such an azo-substituent. The photosensitive member can exhibit good electro-photographic performances including high and stable sensitivity on repetitive use.
    Type: Grant
    Filed: March 8, 1999
    Date of Patent: October 31, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masato Tanaka, Kouichi Nakata
  • Patent number: 6063534
    Abstract: A nitro group-containing naphthoquinone derivative represented by the following general formula: ##STR1## wherein R is a monovalent hydrocarbon group having a nitro group, and a ring A may be substituted with a substituent.This compound is a novel substance and is useful as an electron-transporting agent for an electrophotosensitive material. The electrophotosensitive material using the electron-transporting agent is highly sensitive, exhibits favorable repetitive properties, and makes it possible to favorably form images for extended periods of time.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: May 16, 2000
    Assignee: Mita Industrial Co., Ltd.
    Inventor: Kazunari Hamasaki
  • Patent number: 6040097
    Abstract: Disclosed is a photoconductive solution which has excellent charge characteristics with easy control of charge amount and is completely volatilized after baking. The solution contains 2 to 5% by weight of tetraphenyl ethylene as ultraviolet-sensitive material. 0.1 to 1 wt. % diphenylpicrylhydrazine or 0.1 wt. % or less of tetracyanoquino-dimethane(TCNQ) as ultraviolet-sensitive donor material is desirably added to the tetraphenyl ethylene of 2 to 5 wt. % for better accomplishment of the purpose, and the solution contains at least one of trinitrofluorenone, ethylanthraquinone and their mixture of 0.1 to 1 wt. % as an acceptor. The solution is formed by mixing the above ingredients together with 10 to 20 wt. % of polystyrene-oxazoline copolymer(PS-OX) as polymer binder, and 20 to 85 wt. % of toluene as solvent.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: March 21, 2000
    Assignee: Orion Electric Co., Ltd.
    Inventors: Sang Youl Yoon, Ho Seok Shon
  • Patent number: 6040100
    Abstract: An electrophotographic photosensitive member is formed of a support, and a photosensitive layer disposed on the support. The photosensitive layer is characterized by containing an azo pigment having an organic group represented by formula (1) below: wherein A denotes a residue group of formula (1A) below: ##STR1## and k.sub.1, k.sub.2, Z.sub.1, Z.sub.2, D; R.sub.1 and R.sub.2 are defined in the text. The group of the formula (1) may provide at least one of up to 4 azo-substituents of the azo pigment having an entire structure represented by ##STR2## wherein Ar denotes an aromatic or heterocyclic core unit, Cp denotes a coupler residue group, and --(N.dbd.N--Cp) denotes such an azo-substituent. The photosensitive member can exhibit good electrophotographic performances including high and stable sensitivity on repetitive use.
    Type: Grant
    Filed: March 3, 1999
    Date of Patent: March 21, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masato Tanaka, Hideyuki Takai, Kouichi Nakata
  • Patent number: 6022998
    Abstract: The present invention provides a novel stilbene derivative represented by the general formula (1): ##STR1## wherein R.sup.1 and R.sup.3 represent an alkyl group, an aryl group, an aralkyl group or an alkoxy group which are optionally substituted; and R.sup.2 and R.sup.4 represent a hydrogen atom, an alkyl group or an alkoxy group which are optionally substituted, provided that when the substitution position of R.sup.2 and R.sup.4 is the 4-(para) position, R.sup.2 and R.sup.4 are hydrogen atoms, a method for producing the same and use thereof. The above stilbene derivative (1) is useful as an electric charge transferring material, particularly hole transferring material.
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: February 8, 2000
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Hirofumi Kawaguchi, Yukimasa Watanabe, Yoshio Inagaki
  • Patent number: 5965715
    Abstract: The invention provides novel bisazo compounds which is obtained by coupling two molecules of a 2-hydroxynaphthalene-3,6-dicarboxylic acid derivative and a compound having two diazo groups in its molecule, as well as a process for producing the same. The present compounds are superior in resistance to water, chemical agents, solvents, heat and the like.
    Type: Grant
    Filed: June 22, 1998
    Date of Patent: October 12, 1999
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Masaya Kitayama, Kenji Minami, Hiroyuki Wakamori
  • Patent number: 5876891
    Abstract: An alternating copolymer comprising a repeating unit of the formula:--Z--(X--Y).sub.n-- (I)wherein n is at least 2, X is O, S, Se or Te, and Y and Z are independently an aromatic or substituted aromatic group, and at least one other repeating unit, which is useful as a photosensitive material used in a spatial light modulator.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: March 2, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Akio Takimoto, Hirofumi Wakemoto, Eiichiro Tanaka, Masanori Watanabe, Junko Asayama, Hisahito Ogawa, Shigehiro Sato, Fumiko Yokotani
  • Patent number: 5863683
    Abstract: An electrophotographic photoconductor composed of an electroconductive support and a photoconductive layer formed thereon, which contains as a charge generating material an azo pigment subjected to a salt milling process.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: January 26, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Katsuichi Ohta, Masaomi Sasaki, Tamotsu Aruga
  • Patent number: 5863688
    Abstract: The present invention provides a naphthoquinone derivative represented by the general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are as defined in the specification. An electrophotosensitive material containing this naphthoquinone derivative as an electron transferring material has high sensitivity.
    Type: Grant
    Filed: September 6, 1996
    Date of Patent: January 26, 1999
    Assignee: Mita Industrial Co., Ltd
    Inventors: Yukimasa Watanabe, Sakae Saito, Hirofumi Kawaguchi, Akiyoshi Urano, Fumio Sugai, Atsushi Fujii, Yasufumi Mizuta, Toshiyuki Fukami, Ichiro Yamazato, Yuji Tanaka, Eiichi Miyamoto, Hideo Nakamori, Mitsuo Ihara
  • Patent number: 5830615
    Abstract: The present invention provides a novel naphthylenediamine derivative which is superior in electric charge transferring capability, compatibility with binding resin and stability, and an electrophotosensitive material which has a higher sensitivity and an excellent durability. The above naphthylenediamine derivative is represented by the following general formula (1), and the electrophotosensitive material is formed by providing a photosensitive layer having this naphthylenediamine derivative as an electric charge transferring material on a conductive substrate. ##STR1## wherein R.sup.1 to R.sup.4, R.sup.5a to R.sup.5f and a to d are as defined.
    Type: Grant
    Filed: May 29, 1997
    Date of Patent: November 3, 1998
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Eiichi Miyamoto, Mikio Kakui, Hideo Nakamori, Yukikatsu Imanaka, Tadashi Sakuma, Maki Uchida, Hiroaki Iwasaki, Yasuyuki Hanatani, Nariaki Tanaka, Yuka Nakamura
  • Patent number: 5814237
    Abstract: A method for forming a deflection grating is disclosed, includes the steps of: sequentially forming a dielectric layer and photoresist layer on a compound semiconductor substrate, and patterning the photoresist layer through optical holography to expose the dielectric layer; removing a portion of the dielectric layer on which the patterned photoresist layer is not formed, through RIE using the patterned photoresist layer as a mask; anisotropically etching a portion of the semiconductor substrate on which the dielectric layer is not formed, through RIE using the dielectric layer as a mask, to form a deflection grating; and removing the dielectric layer.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: September 29, 1998
    Assignees: Electronics and Telecommunications Research Institute, Korea Telecommunication Authority
    Inventor: Chong-Dae Park
  • Patent number: 5798197
    Abstract: The use of low molecular-weight or polymeric organic compounds which are present in the columnar-helical phase and have liquid-crystalline properties, as photoconductors or in electronic components, corresponding photoconductive layers, an electrophotographic recording material and a method for enhancing the photoconductivity.
    Type: Grant
    Filed: February 20, 1997
    Date of Patent: August 25, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Paulus, Lukas Haussling, Karl Siemensmeyer, Karl-Heinz Etzbach, Dieter Adam, Juergen Simmerer, Helmut Ringsdorf, Peter Schuhmacher, Dietrich Haarer, Sundeep Kumar
  • Patent number: 5753394
    Abstract: The present invention provides a trinitrofluorenonimine derivative represented by the general formula (I): ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are the same or different and indicate an alkyl group which may have a substituent.Such a derivative is superior in electron transferring capability. Accordingly, the electrophotosensitive material having the photosensitive layer containing this derivative is superior in sensitivity.
    Type: Grant
    Filed: November 27, 1995
    Date of Patent: May 19, 1998
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Hirofumi Kawaguchi, Syunichi Matsumoto
  • Patent number: 5731078
    Abstract: A coated donor roll comprises a core with a coating, the coating comprising a charge transporting polymer, an organic acid metal salt compound, and iodine.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: March 24, 1998
    Assignee: Xerox Corporation
    Inventors: Bing R. Hsieh, Joan R. Ewing, Damodar M. Pai, Kathyrn A. Wallace, Jerry H. Taylor, Francois Soos, Joseph R. Weber
  • Patent number: 5721082
    Abstract: There are provided an electrophotographic photoreceptor having a photosensitive layer containing at least one amine compound represented by formula (1): ##STR1## wherein Ar.sub.1 represents a substituted or unsubstituted aryl group; Ar.sub.2 represents a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted biphenylene group or a substituted or unsubstituted anthrylene group; R.sub.1 represents a hydrogen atom, a lower alkyl group or a lower alkoxy group; X represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group; and Y represents a substituted or unsubstituted aryl group, or a group represented by formula (2) or (3) described in the specification.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: February 24, 1998
    Assignee: Hodogaya Chemical Co., Ltd.
    Inventors: Atsushi Takesue, Mitsutoshi Anzai, Takanobu Watanabe, Chieko Inayoshi
  • Patent number: 5707768
    Abstract: A diamine compound of the following formula (1): ##STR1## wherein R.sub.1 is a hydrogen atom, a lower alkyl group or a lower alkoxy group, each of A.sub.1, A.sub.2 and A.sub.3 which are independent of one another, is a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a group of the following formula (2): ##STR2## wherein R.sub.1 is as defined above, and X is a substituted or unsubstituted arylene group or a substituted or unsubstituted heterocyclic bivalent group.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: January 13, 1998
    Assignee: Hodogaya Chemical Co., Ltd.
    Inventors: Mitsutoshi Anzai, Atsushi Takesue, Takanobu Watanabe, Chieko Inayoshi
  • Patent number: 5707747
    Abstract: The present invention provides novel amine compounds useful as electron-transporting materials to be incorporated in organic electro-luminescence devices. More particularly, the present invention provides an organic electro-luminescence device (organic EL device) which can find wide application in various display units, requires a low applied voltage and exhibits a high luminance and an excellent stability.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: January 13, 1998
    Assignees: Hodogaya Chemical Co., Ltd., Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiromitsu Tomiyama, Masahiko Oshino, Ikuko Ihara, Naoko Nakanishi, Mutsumi Suzuki, Masao Fukuyama, Mutsuaki Murakami, Taro Nambu
  • Patent number: 5705694
    Abstract: The present invention provides a novel trinitrofluorenonimine derivative represented by the general formula (1): ##STR1## wherein R.sup.0 is an alkyl group; and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same or different and indicate a hydrogen atom, an alkyl, an alkoxy, an aryl, an aralkyl, a halogen atom or an alkyl halide. This derivative is superior in electron transferring capability and compatibility with binding resin. Accordingly, an electrophotosensitive material comprising this derivative as an electron transferring material is superior in sensitivity.
    Type: Grant
    Filed: November 17, 1995
    Date of Patent: January 6, 1998
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Hirofumi Kawaguchi, Yasufumi Mizuta, Syunichi Matsumoto, Nobuko Akiba, Toshiyuki Fukami, Ichiro Yamazato, Hisakazu Uegaito, Yuji Tanaka
  • Patent number: 5700614
    Abstract: Cyclopentadiene derivative compounds, and an electrophotographic photoconductor comprising one cyclopentadiene derivative compound are disclosed. The cyclopentadiene derivative compounds are useful for use in a photoconductive layer, and readily soluble in a binder resin. The electrophotographic photoconductor can be prepared by using a simple, effective production method. The electrophotographic photoconductor comprising one cyclopentadiene derivative compound provides a good light sensitivity and high durability.
    Type: Grant
    Filed: March 2, 1995
    Date of Patent: December 23, 1997
    Assignee: Ricoh Company, Ltd.
    Inventors: Megumi Kawahara, Ikuko Yamada, Masayuki Shoshi, Akio Kojima
  • Patent number: 5683842
    Abstract: Photoconductive imaging members comprised of unsymmetrical dimeric perylene as a charge generator, wherein said perylene is of the following formula ##STR1## wherein R is hydrogen, alkyl, cycloalkyl, substituted alkyl, aryl, substituted aryl, aralkyl or substituted aralkyl group, and X-Y is an unsymmetrical bridging moiety of alkylene, substituted alkylene, arylene, substituted arylene, aralkylene or substituted aralkylene.
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: November 4, 1997
    Assignee: Xerox Corporation
    Inventors: James M. Duff, C. Geoffrey Allen, Ah-Mee Hor, Gordon K. Hamer
  • Patent number: 5622799
    Abstract: An electrophotographic photosensitive member, a process cartridge having the electrophotographic photosensitive member and an electrophotographic apparatus are provided. The electrophotographic photosensitive member has a conductive substrate and a photosensitive layer thereon, wherein the photosensitive layer contains a disazo pigment represented by the following formula (1): ##STR1## wherein R.sub.1 to R.sub.8 are the same or different and are each a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, n is a positive integer, A.sub.1 and A.sub.2 are the same or different and are each a coupler residual group having a phenolic hydroxyl group, and at least one of A.sub.1 and A.sub.2 is a coupler residual group represented by the following formula (2): ##STR2## wherein X.sub.1 is a residual group forming a polycyclic aromatic ring or a heterocyclic ring by condensing with a benzene ring, R.sub.9 and R.sub.
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: April 22, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichi Suzuki, Hideyuki Takai, Satomi Sugiyama, Mitsuhiro Kunieda
  • Patent number: 5587263
    Abstract: A triarylamine compound useful as a charge transport material of an electrophotographic photoreceptor, which represented by formula (I) ##STR1## wherein Ar.sub.1 and Ar.sub.2 each represents a phenyl group or a condensed ring group.
    Type: Grant
    Filed: May 18, 1995
    Date of Patent: December 24, 1996
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Katsumi Nukada, Akira Imai, Ryosaku Igarashi
  • Patent number: 5576132
    Abstract: An electrophotographic photoconductor comprises an electroconductive substrate and a photoconductive layer formed thereon comprising as an effective component at least one pyrenylamine derivative of formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, W, j, k, l, m and n are specifically defined in the specification. Furthermore, a novel pyrenylamine derivative for use in the above electrophotographic photoconductor, an aldehyde compound, which is an intermediate for producing the pyrenylamine derivative, and methods of preparing the pyrenylamine derivative and the aldehyde compound are disclosed.
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: November 19, 1996
    Assignee: Ricoh Company, Ltd.
    Inventors: Chiaki Tanaka, Masaomi Sasaki, Tamotsu Aruga, Tomoyuki Shimada, Hiroshi Adachi
  • Patent number: 5569749
    Abstract: An organic photoconductive material is represented by the following general formula [1]:A.sub.1 --N.dbd.N--B--N.dbd.N--A.sub.2 [1],wherein B is a divalent organic group bonded to nitrogen atoms forming azo groups, A.sub.1 and A.sub.2 are groups different from each other, A.sub.1 is represented by the following general formula [A1]: ##STR1## wherein X is an atomic group which is necessary for forming an aromatic hydrocarbon ring or an aromatic hetero-ring by condensation with the benzene ring, Y is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom, m is an integer of 1 to 4, R is an aromatic hydrocarbon ring group or an aromatic hetero-ring group and n is 1 or 2, and A.sub.2 is a group represented by one of the following general formulae [A2] and [A3]: ##STR2## wherein a.sub.1 is a group selected from R, --N.dbd.CH--R and ##STR3## R, X, Y, m and n are the same as those in the general formula [A1] and p is 0 or 1.
    Type: Grant
    Filed: January 18, 1996
    Date of Patent: October 29, 1996
    Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Hisao Kouno, Shyouichi Takahashi, Kazuhiro Higashide, Nakaji Komiyama, Osamu Suda, Masaru Hasegawa
  • Patent number: 5561017
    Abstract: A polyester polymer comprising repeating units (I), or repeating units (I) and (II), and having a reduced viscosity (.eta. sp/c) of 0.2 to 10.0 dl/g, measured at 20.degree. C. as a 0.5 g/dl solution dissolved in methylene chloride is prepared by allowing a dihydric phenol (III), or dihydric phenols (III) and (IV), to react with a carbonate precursor or a dibasic acid. An electrophotographic photoreceptor which comprises an electroconductive substrate and a photosensitive layer disposed on the electroconductive substrate and containing the polyester polymer as a charge transporting material or a binder resin. ##STR1## wherein, W is --O-- or single bond, X is a divalent group which is derived from a dihydric phenol containing a hydrazine structure, each of R.sup.25 and R.sup.26 is a halogen atom, an alkyl group, a cycloalkyl group or an aryl group, each of m and n is an integer of 0 to 4, Y is single bond, --O--, --S--, --SO--, --SO.sub.2 --, --CR.sup.27 R.sup.28 --, a 1,1-cycloalkylene group or an .alpha.,.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: October 1, 1996
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Tomohiro Nagao, Shuji Sakamoto, Hironobu Morishita, Hideyuki Miyamoto
  • Patent number: 5558964
    Abstract: An to an electrophotographic photosensitive member includes a photosensitive layer containing a specified oxytitanium phthalocyanine and a polyvinyl acetal resin having a structural unit represented by Formula: ##STR1## wherein X is a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a nitro group, or a cyano group; and Y is a fluorine atom, a chlorine atom, a bromine atom, a nitro group, or a cyano group. The photosensitive member maintains a low residual potential without deterioration of the sensitivity during repeated use.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: September 24, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Yoshihara, Nobuyuki Hanami, Hideyuki Takai, Hideki Anayama, Hajime Miyazaki, Junichi Kishi, Itaru Yamazaki, Harumi Sakoh, Tetsuro Kanemaru, Kazushi Iuchi, Hideyuki Ainoya
  • Patent number: 5527653
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer thereon. The photosensitive layer contains a disazo pigment having a 1,2-benzofluorenone as a central structure. A process cartridge and an electrophotographic apparatus containing the electrophotographic photosensitive member is also provided.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: June 18, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masato Tanaka
  • Patent number: 5484673
    Abstract: An electrophotographic photosensitive member of the present invention has a photosensitive lazer containing a compound represented by the formula (1): ##STR1## The electrophotographic photosensitive member has a high sensitivity and can maintain stable and excellent electrophotographic characteristics even when repeatedly used.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: January 16, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshihiro Kikuchi, Akio Maruyama, Noriko Ohtani, Shin Nagahara, Hisami Tanaka, Teigo Sakakibara, Takakazu Tanaka