Binder For Radiation-conductive Composition Patents (Class 430/96)
  • Patent number: 5030532
    Abstract: An electrostatographic imaging member comprising a support layer and at least one electrophotoconductive layer, said imaging member comprising a polyarylamine polymer represnted by the formula: ##STR1## wherein: n is between about 5 and about 5,000 or 0 if p>0,o is between about 9 and about 5,000, or is 0 if p>0 or n=0,p is between about 2 and about 100, or is 0 if n>0, X' and X" are independently selected from a group having bifunctional linkages,Q is a divalent group derived from certain hydroxy terminated arylamine reactants,Q' is a divalent group derived from a hydroxy terminated polyarylamine containing the group defined for Q and having a weight average molecular weight between about 1000 and about 80,000and the weight average molecular weight of the polyarylamine polymer is between about 10,000 and about 1,000,000.
    Type: Grant
    Filed: April 20, 1990
    Date of Patent: July 9, 1991
    Assignee: Xerox Corporation
    Inventors: William W. Limburg, Dale S. Renfer, John F. Yanus, Jean M. Frechet, Sylvie Gauthier, Dasarao K. Murti, Giuseppa Baranyi, Zoran D. Popovic, Rafik O. Loutfy
  • Patent number: 5021311
    Abstract: An electrophotographic photoreceptor comprising a support having provided thereon at least one photoconductive layer containing at least an inorganic photoconductive substance and a binder resin, wherein said binder resin comprises at least one copolymer resin comprising a monofunctional macromonomer (M) and a monomer (A), said monofunctional macromonomer (M) having a weight average molecular weight of not more than 2.times.10.sup.4 and containing at least one polymerization component represented by formula (II-a) or (II-b): ##STR1## wherein X.sub.0 represents --COO--, --OCO--, --CH.sub.2 OCO--, --CH.sub.2 COO--, --O--, --SO.sub.2 --, --CO--, ##STR2## wherein R.sub.1 represents a hydrogen atom or a hydrocarbon group; Q.sub.0 represents an aliphatic group having from 1 to 18 carbon atoms or an aromatic group having from 6 to 12 carbon atoms, said carbon numbers not inclusive of substituents; b.sub.1 and b.sub.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: June 4, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 5017448
    Abstract: An electrophotographic lithographic printing plate precursor is described which utilizes an electrophotographic photoreceptor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises at least one resin which contains at least one kind of functional group capable of producing at least one carboxyl group through decomposition and is crosslinked at least in part to bring about improvements in background stain resistance and printing durability.
    Type: Grant
    Filed: January 27, 1989
    Date of Patent: May 21, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 5009975
    Abstract: An electrophotographic photoreceptor comprising a support having thereon at least one photoconductive layer containing at least an inorganic photoconductive material and a binder resin, wherein the binder resin contains(A) at least one resin having a weight average molecular weight of from 1.times.10.sup.3 to 3.times.10.sup.4 with at least one substituent selected from the group consisting of --PO.sub.3 H.sub.2, --SO.sub.3 H, --COOH, ##STR1## wherein R represents a hydrocarbon group having from 1 to 10 carbon atoms or --OR', wherein R' represents a hydrocarbon group having from 1 to 10 carbon atoms, and a cyclic acid anhydride-containing group, being bonded to one or both of the terminals of the polymer main chain thereof, and(B) at least one resin having a weight average molecular weight of 5.times.10.sup.4 or more and containing, as a polymerization component, at least a repeating unit represented by formula (b-i): ##STR2## wherein T represents --COO--, --OCO--, --CH.sub.2 OCO--, --CH.sub.
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: April 23, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 5006443
    Abstract: Polymers comprising perfluoralkyl groups, reproduction layers containing these polymers and use thereof for waterless offset printing. The novel perfluoralkyl group-containing polymers comprise polymers or polycondensates and have, in each case as substituents on different carbon atoms of benzene rings, phenolic OH groups and perfluoroalkyl groups which are optionally attached through intermediate members. In particular, at least 10% of the polymer units carry perfluoroalkyl groups. These polymers are either formed by condensation of substituted phenols (e.g., 4-hydroxybenzoic acid-perfluoroalkyl ester) with an aldehyde, a ketone, or a reactive bismethylene compound or by reacting polymers containing phenolic OH groups (e.g., hydroxypolystyrene) or polycondensates containing reactive OH groups (e.g., phenol-formaldehyde resins) with a perfluoroalkyl group-containing compound (e.g., 2,2-dihydroperfluorodecanoic acid chloride).
    Type: Grant
    Filed: January 7, 1988
    Date of Patent: April 9, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Werner H. Muller
  • Patent number: 5006433
    Abstract: A printing plate precursor for electrophotographic printing plate making purposes wherein the binder resin used for a photoconductive layer comprises a copolymer of at least one vinyl ester compound or allyl ester compound having an aromatic ring as a monomer component and at least one vinyl polymerizable monomer containing at least one acidic functional group as a monomer component.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: April 9, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroaki Yokoya, Hiromichi Tachikawa
  • Patent number: 5001029
    Abstract: An electrophotographic lithographic printing plate precursor which utilizes an electrophotographic photoreceptor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises at least one resin which contains at least one functional group capable of producing at least one hydroxyl group through decomposition and is crosslinked in part to bring about improvements in background-stain resistance and printing durability.In accordance with this invention, electrophotographic lithographic printing plate precursors excellent in background stain resistance and printing durability are obtained.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: March 19, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4996121
    Abstract: An electrophotographic lithographic printing plate precursor comprising a conductive support having provided thereon at least one photoconductive layer containing photocondutive zinc oxide and a resin binder is disclosed, wherein the resin binder comprises at least one resin (A) containing at least one functional group capable of forming at least one hydroxyl group upon decomposition and at least one member selected from the group consisting of (B) a heat- and/or photo-curable resin and a crosslinking agent. Since the hydroxyl group formed in the resin (A) enhances hydrophilic properties of nonimage areas, the printing plate obtained from the precursor is resistant to background stains. This effect is further ensured by the crosslinked structure formed between the resin (A) and the resin (B) and/or a crosslinking agent.
    Type: Grant
    Filed: January 4, 1989
    Date of Patent: February 26, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4985326
    Abstract: An electrophotographic photoreceptor comprising an electroconductive layer and a photosensitive layer disposed on one surface of the electroconductive substrate, the photosensitive layer containing a specific polycarbonate or polycarbonate copolymer used as a binder-resin, has such advantageous characteristics that it can be produced by using an application method without accompanying with whitening (gelation) of the coating liquid used for forming the photosensitive layer nor inviting occurrence of solvent-cracks in the formed photosensitive layer.In addition, it excels in mechanical strength and the characteristics required in electrophotography which can be maintained even if it is repeatedly used over long periods.
    Type: Grant
    Filed: July 27, 1989
    Date of Patent: January 15, 1991
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventor: Shuji Sakamoto
  • Patent number: 4983482
    Abstract: A layered photoresponsive imaging member comprised of a photogenerating layer, and in contact therewith a hole transporting layer comprised of charge transport polyurethanes of the following formula, optionally doped with a charge transport compound, or optionally dispersed in an inert resinous binder: ##STR1## wherein A, B and Z are independently selected from the group of bifunctional linkages; R is an alkyl or aryl group; Ar is an aryl or substituted aryl group; x and y represent the mole fractional numbers of the polyurethane structural composition units, subject to the provision that x is greater than 0 and that the sum of x and y is equal to 1.0; and n represents the number of repeating segments.
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: January 8, 1991
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Dasarao K. Murti, Lupu Alexandru
  • Patent number: 4977049
    Abstract: An electrophotographic lithographic printing plate precursor having an electrophotographic photoreceptor which has at least one photoconductive layer containing a photoconductive zinc oxide and a resin binder on a conductive support, wherein the resin binder contains at least one resin which has at least one functional group capable of forming at least one group selected from a thiol group, a phospho group, an amino group and a sulfo group by decomposition and at least a part of which has been crosslinked.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: December 11, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Eiichi Kato
  • Patent number: 4971873
    Abstract: A photoconductor element which employs a solvent soluble polyimide as the polymeric binder in at least one layer thereof. The polyimide is characterized by the formula: ##STR1## where R is a dianhydride and n is an integer in the range of 50 to 450.
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: November 20, 1990
    Assignee: Eastman Kodak Company
    Inventors: Joseph A. Pavlisko, William J. Staudenmayer
  • Patent number: 4971871
    Abstract: An electrophotographic lithographic printing plate precursor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises (A) at least one resin containing at least one functional group capable of forming at least one hydrophilic group selected from a thiol group, a phosphono group, an amino group, and a sulfo group upon decomposition and at least one of (B) a heat-curable and photo-curable resin and (C) a crosslinking agent. The printing plate precursor provides a printing plate exhibiting excellent resistance to background stains and printing durability.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: November 20, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4968572
    Abstract: An electrophotographic photoreceptor comprising a support having provided thereon at least one photoconductive layer containing at least an inorganic photoconductive substance and a binder resin is disclosed, wherein said binder resin contains (A) a resin having at least one kind of acidic group selected from the group consisting of --PO.sub.3 H.sub.2, --SO.sub.3 H, and --COOH at the terminal end of the main chain of the resin. The photoreceptor exhibits excellent electrostatic characteristics, image formation performance as well as printing suitability irrespective of change in environmental condition or the kind of sensitizing dyes to be used in combination with the photoreceptor.
    Type: Grant
    Filed: September 8, 1988
    Date of Patent: November 6, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4965157
    Abstract: Polyolefin derivatives, which are useful not only as the photoconductive materials for electrophotography, but also as a charge transporting material employed in a function-separating type photoconductor which uses an organic or inorganic pigment as a charge generating material, and an electrophotographic photoconductor containing at least one of the above polyolefin derivatives in a photoconductive layer thereof, are disclosed.
    Type: Grant
    Filed: September 16, 1990
    Date of Patent: October 23, 1990
    Assignees: Ricoh Company, Ltd., Hodogaya Chemical Company, Ltd.
    Inventors: Mitsuru Hashimoto, Tomoyuki Shimada, Nobuo Suzuki, Takayuki Sakai, Susumu Suzuka, Masaomi Sasaki
  • Patent number: 4963452
    Abstract: A photosensitive member for inputting digital light comprises photoconductive fine crystals of a genuine semiconductor or an amorphous semiconductor and having a mean particle diameter of 0.01.mu.-0.5.mu. and a binder embedding the fine crystals and having a volume resistivity of higher than 10.sup.13 ohm-cm. A mixture of the fine crystals and the binder is formed into a photosensitive layer having a thickness of 5.mu.-30.mu. and .gamma. of a latent image of larger than 6. The photosensitive member can be used in various methods of electrophotography.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: October 16, 1990
    Inventor: Koichi Kinoshita
  • Patent number: 4963453
    Abstract: A photosensitive member for use in electrophotography in manufactured by preparing a coating material by mixing together a powder of photosensitive material, for example .alpha. or .epsilon. phthalocyanine, and a binder of a self-hardening type resin, for example a polyester resin, applying the coating material on the surface of a hollow metal cylinder to form a photosensitive layer, smoothing the surface of the photosensitive layer by applying a mechanical force, and hardening the photosensitive layer by heat or ultraviolet ray.
    Type: Grant
    Filed: February 8, 1989
    Date of Patent: October 16, 1990
    Assignee: Koichi Kinoshita
    Inventor: Koichi Kinoshita
  • Patent number: 4960661
    Abstract: An electrophotographic lithographic printing plate precursor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises (A) at least one resin containing at least one functional group capable of forming at least one carboxyl group upon decomposition and at least one of (B) a heat-curable or a photo-curable resin, and (C) a cross-linking agent. The plate precursor provides a printing plate having excellent resistance to background stains and printing durability.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: October 2, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4959288
    Abstract: A photoconductive imaging member comprised of a photogenerating layer, and a charge transport layer comprised of diaryl biarylylamine copolymers of the formula ##STR1## wherein A and B are independently selected from bifunctional linkages; Z is alkylenedioxy, arylenedioxy, or substituted derivatives thereof; R and R' are alkyl, aryl, substituted alkyl, substituted aryl, alkoxy, or halogen; x and y are mole fractions wherein x and y are greater than 0 and the sum of x and y is equal to 1.0; a and b are the numbers 0, 1 or 2; and n represents the number of monomer segments.
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: September 25, 1990
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Barkev Keoshkerian, Giuseppa Baranyi, Dasarao K. Murti
  • Patent number: 4956256
    Abstract: A photosensitive member for electrophotography comprising a photosensitive layer on a conductive substrate, said photosensitive layer containing as a binder resin a modified polycarbonate resin having the repeating structural units represented by the following general formula (1) and (2); ##STR1## wherein R.sup.1 and R.sup.2 are selected from a hydrogen atom, an alkyl group having 1-3 carbon atoms and a halogen atom, at least one of R.sup.1 and R.sup.2 being the alkyl or the halogen atom, and ##STR2## the ratio of the repeating structural unit of the general formula (1) to that of the general formula (2) being at least 20:80. This photosensitive member is highly resistant to mechanical wear and the deterioration of sensitivity and chargeability.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: September 11, 1990
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Shigenori Ohtsuka, Hiroshi Urabe, Masahiro Nukui, Mamoru Nozomi, Setsuko Sasakawa
  • Patent number: 4954407
    Abstract: An electrophotographic photoreceptor comprising a support having thereon at least one photoconductive layer containing at least inorganic photoconductive particles and a binder resin, wherein said binder resin has a weight average molecular weight of from 1.times.10.sup.3 to 5.times.10.sup.4 and comprises (A) at least one resin comprising, as a polymerization component, (a-i) not less than 30% by weight of at least one repeating unit represented by formula (I) or (II): ##STR1## wherein X.sub.1 and X.sub.2, which may be the same or different, each represents a hydrogen atom, a hydrocarbon group having from 1 to 10 carbon atoms, a chlorine atom, a bromine atom, --COY.sub.1 or --COOY.sub.2, wherein Y.sub.1 and Y.sub.2 each represents a hydrocarbon group having from 1 to 10 carbon atoms, provided that both X.sub.1 and X.sub.2 do not simultaneously represent a hydrogen atom; and W.sub.1 and W.sub.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: September 4, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4952475
    Abstract: An electrophotographic photoreceptor comprising a support having provided thereon at least one photoconductive layer containing at least inorganic photoconductive particles and a binder resin, is disclosed wherein said binder resin comprises (1) at least one resin (A) containing at least one acidic group selected from --PO.sub.3 H.sub.2, --SO.sub.3 H, --COOH, and ##STR1## wherein R represents a hydrocarbon group, at the terminal of the polymer main chain thereof, and (2) at least one of a thermosetting resin (B) containing a crosslinking functional group and a crosslinking agent. The photoreceptor exhibits improved electrostatic characteristics. The photoreceptor provides an electrophotographic lithographic printing plate precursor which exhibits excellent image reproducibility irrespective of a variation of environmental condition at the time of electrophotographic processing and produces a printing plate having improved printing durability and causing no background stains.
    Type: Grant
    Filed: February 9, 1989
    Date of Patent: August 28, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4950572
    Abstract: The photoconductor for electrophotography comprises a novel hydrazone compound as a charge transporting substance. The hydrazone compound is represented by the following general formula: ##STR1## wherein, R.sub.1 stands for a hydrogen atom, a halogen atom, a hydroxy group, an alkoxy group or a nitro group, each of R.sub.2, R.sub.3 and R.sub.4 stands for an aryl group, an alkyl group, an aralkyl group, each of which may have a substituent(s), and at least one of R.sub.2, R.sub.3 and R.sub.4 stands for a thenyl group which may have a substituent.
    Type: Grant
    Filed: March 16, 1989
    Date of Patent: August 21, 1990
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Masami Kuroda, Youichi Nakamura, Noboru Furusho
  • Patent number: 4937163
    Abstract: An imaging member comprised of an ionically conductive film forming polymer, such as sulfonated polystyrene, and an electrically insulating softenable layer comprising a fracturable layer containing electrically photosensitive migration marking particles.
    Type: Grant
    Filed: January 27, 1989
    Date of Patent: June 26, 1990
    Assignee: Xerox Corporation
    Inventors: Man C. Tam, Arnold L. Pundsack
  • Patent number: 4933246
    Abstract: An electrophotographic imaging member comprising a supporting substrate having an electrically conductive surface, a polymeric blocking layer and at least one photoconductive layer, the polymeric blocking layer having a surface resistivity greater than about 10.sup.10 ohm/sq between the supporting substrate and the photoconductive layer, the blocking layer comprising the heat dried product of a coating mixture comprising a film forming acid, metal salt, or ester copolymer comprising a backbone chain of repeating hydrocarbon units and acidic or acid derivative groups as pendant side chains chemically bonded to the backbone chain, the acidic groups selected from the group consisting of sulfonic acids, carboxylic acids, phosphonic acids and acid anhydrides, and silica gel.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: June 12, 1990
    Assignee: Xerox Corporation
    Inventor: Leon A. Teuscher
  • Patent number: 4933248
    Abstract: An electrophotographic recording material is disclosed that comprises an electrically conducting layer support being in particular suitable for the production of printing plates or printed circuits, and a photoconductive layer comprising an organic photoconductor, a phenolic resin as the binder, a sensitizer and customary additives. The binder employed is an optionally substituted polyvinylphenol which has a molecular weight (weight average) of preferably between 1,500 and 60,000. The polyvinylphenol may be halogenated, preferably brominated. Furthermore, an o-quinonediazide may be contained in the photoconductive layer. The recording material is distinguished by a high charging capacity, good photosensitivity and excellent solubility properties. It is suitable for the reproduction of fine image elements.
    Type: Grant
    Filed: January 11, 1989
    Date of Patent: June 12, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Erwin Lind, Franz Freimuth
  • Patent number: 4933244
    Abstract: An imaging member comprising an electrophotographic imaging member comprising a substrate having an electrically conductive surface, a charge generator layer, a charge transport layer comprising a polycarbonate film forming binder and a charge transporting small molecule, and an interface layer comprising a polymer and a charge transporting between the charge generator layer and the charge transport layer, wherein the interface layer comprises a mixture of a charge transporting material and certain phenolic epoxy polymers of polyesters.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: June 12, 1990
    Assignee: Xerox Corporation
    Inventors: Leon A. Teuscher, Damodar M. Pai
  • Patent number: 4933245
    Abstract: An electrophotographic photoreceptor is disclosed, which comprises an electrically conductive support having provided thereon a photoconductive layer containing, as a charge transport material, a compound represented by formula (I) ##STR1## wherein R.sub.1 represents an alkyl group, and R.sub.2 and R.sub.3, which may be the same or different, each represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, an alkoxycarbonyl group, or a substituted amino group. The photoreceptor satisfies both electrical and mechanical requirements without undergoing adverse influences from binder resins used therein.
    Type: Grant
    Filed: September 18, 1987
    Date of Patent: June 12, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yutaka Akasaki, Katsuhiro Sato, Naoya Yabuuchi, Kiroyuki Tanaka, Katsumi Nukada
  • Patent number: 4929526
    Abstract: An electrophotographic lithographic printing plate precursor obtained from an electrophotographic photoreceptor comprising a conductive support having provided thereon at least one photoconductive layer containing photoconductive zinc oxide and a resin binder, wherein said resin binder comprises a resin containing at least one functional group capable of forming at least one hydroxyl group upon being decomposed. The printing plate precursor exhibits high image reproducibility, stain resistance, and green preservability, and a printing plate obtained therefrom has high resistance to background stain and has printing durability.
    Type: Grant
    Filed: March 7, 1989
    Date of Patent: May 29, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii, Ryosuke Itakura, Hidefumi Sera
  • Patent number: 4925756
    Abstract: Compositions and films are provided for the preparation of electrostatic printing masters. The composition binder permits use of aqueous silver halide photographic techniques to image the master for printing, and exhibits insulation properties needed for electrostatic printing under typical conditions of relative humidity.
    Type: Grant
    Filed: July 21, 1989
    Date of Patent: May 15, 1990
    Assignee: E. I. Dupont de Nemours and Company
    Inventor: Allan Cairncross
  • Patent number: 4913998
    Abstract: Compositions and films are provided for the preparation of electrostatic printing masters. The composition binder permits use of aqueous silver halide photographic techniques to image the master for printing, and exhibits insulation properties needed for electrostatic printing under typical conditions of relative humidity.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: April 3, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Allan Cairncross, Catherine T. Chang
  • Patent number: 4910112
    Abstract: An electrophotographic master plate for lithographic printing is disclosed. The plate comprises a conductive support having thereon at least one photographic layer containing photoconductive zinc oxide and at least one binder resin, wherein at least one functional group contained in at least one component of the binder resin is a group represented by formula (I) ##STR1## wherein X represents ##STR2## wherein Y represents an oxygen atom or a sulfur atom; R.sub.2, R.sub.2, and R.sub.3, each represents a hydrogen atom or an aliphatic group; n represents 5 or 6; Z represents an organic group forming a cyclic imido group; and R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8, each represents a hydrogen atom or an aliphatic group; or at least one of the group R.sub.5 and R.sub.6 and the group R.sub.7 and R.sub.8 combine with each other to form a condensed ring.
    Type: Grant
    Filed: September 1, 1988
    Date of Patent: March 20, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii
  • Patent number: 4908288
    Abstract: An electrophotographic photosensitive member has a charge generation layer and a charge transport layer on a conductive substrate, wherein the monomer unit constituting a polymer binder contained in said charge generation layer is the same as that constituting a polymer binder contained in said charge transport layer, and the weight-averaged molecular weight of the polymer binder contained in said charge generation layer is in a range from two to six times of that of the polymer binder contained in said charge transport layer.
    Type: Grant
    Filed: August 25, 1988
    Date of Patent: March 13, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hideki Anayama
  • Patent number: 4877701
    Abstract: A photosensitive member for electrophotography which is excellent in successive copying characteristics as well as mechanical durability is provided. The photosensitive member comprises a photosensitive layer, at least the surface portion of which comprises a lubricant, and a charge-transporting substance having an oxidation potential of 0.6 volt or above.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: October 31, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masaaki Hiro, Tomohiro Kimura, Hisami Tanaka, Noboru Kashimura, Shigemori Tanaka, Hitoshi Tohma, Masafumi Hisamura
  • Patent number: 4871638
    Abstract: An electrophotographic photosensitive material comprising a support having provided thereon a photoconductive layer containing at least an inorganic photoconductive material and a binder, wherein said binder comprises at least resin (A) having a weight average molecular weight of from 1.times.10.sup.3 to 1.times.10.sup.4 and containing from 0.05 to 20% by weight a copolymer component having at least one acid group selected from --PO.sub.3 H, --COOH, --SO.sub.3 H, --OH, --SH, and ##STR1## wherein R respresents a hydrocarbon group; and resin (B) having a weight average molecular weight of at least 3.times.10.sup.4, said resin (B) not containing the aforesaid acid group nor a basic group.
    Type: Grant
    Filed: March 9, 1988
    Date of Patent: October 3, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii, Ryosuke Itakura
  • Patent number: 4868081
    Abstract: Compositions and films are provided for the preparation of electrostatic printing masters. The composition binder permits use of aqueous silver halide photographic techniques to image the master for printing, and exhibits insulation properties needed for electrostatic printing under typical conditions of relative humidity.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: September 19, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Allan Cairncross
  • Patent number: 4865934
    Abstract: The present invention relates a photosensitive member which has a charge generating layer comprising specific phthalocyanine as a charge generating material and specific resin as a binder, and/or a charge transporting layer comprising specific hydrazone compounds as a charge transporting material and dyes as an absorbent for undesired lights.
    Type: Grant
    Filed: April 22, 1988
    Date of Patent: September 12, 1989
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Hideaki Ueda, Mitsutoshi Sakamoto, Kimiyuki Ito
  • Patent number: 4863822
    Abstract: An electrophotographic photoconductor is disclosed, which comprises an electroconductive support and a photoconductive layer comprising (i) a charge generation layer and (ii) a charge transport layer formed on the support, in which the charge generation layer comprises a charge generating material and one component selected from the group consisting of an aliphatic alcohol and a crown ether, or the charge transport layer comprises a charge transporting material and one component selected from the group consisting of an aliphatic alcohol, a polyalkylene glycol, a polyalkylene glycol ester, a polyalkylene glycol ether, and a crown ether.
    Type: Grant
    Filed: March 9, 1988
    Date of Patent: September 5, 1989
    Assignee: Ricoh Company Ltd.
    Inventors: Toshio Fukagai, Kiyoshi Taniguchi, Katsuichi Ohta, Kayoko Yokoyama, Minoru Umeda
  • Patent number: 4855202
    Abstract: An electrophotographic photosensitive member having the structure comprising a conductive substrate laminated thereon with (i) a charge generation layer comprising two or more kinds of charge-generating materials incorporated in binder resins and (ii) a charge transport layer, wherein said charge generation layer comprises at least a first charge generating material dispersed in a first binder resin and a second charge generating material dispersed in a second binder resin, such that the binder resins in the charge generating layer are incompatible with each other.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: August 8, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Yoshihara, Tomohiro Kimura
  • Patent number: 4853307
    Abstract: An imaging system including a migration imaging member comprising a substrate and an electrically insulating softening layer adjacent the substrate, the softenable layer comprising a fracturable layer of electrically photosensitive migration marking material located substantially at or near the surface of the softenable layer spaced from the substrate, and a copolymer of styrene and ethyl acrylate in at least one layer adjacent the substrate, the copolymer comprising between about 40 and about 80 mole percent styrene, between about 20 and about 60 mole percent ethyl acrylate, the copolymer having a M.sub.n between about 4,000 and about 35,000, a M.sub.w between about 10,000 and about 80,000, a T.sub.g between about 30.degree. C. and about 75.degree. C., and a melt viscosity between about 1.times.10.sup.2 poise and about 1.times.10.sup.6 poise at 115.degree. C.
    Type: Grant
    Filed: January 4, 1988
    Date of Patent: August 1, 1989
    Assignee: Xerox Corporation
    Inventors: Man C. Tam, Steven Bloembergen, Gregory J. Kovacs, Carol A. Jennings, Rafik O. Loutfy, Sandra J. Gardner, Michael G. Taylor
  • Patent number: 4851314
    Abstract: An electrophotographic photosensitive member comprises a photosensitive layer on an electroconductive substrate, and photosensitive layer comprising at least one polycarbonate resins (I) having a number average molecular weight of 1.5.times.10.sup.4 or less and at least one of polycarbonate resins (II) having a number average molecular weight of 4.5.times.10.sup.4 or more, said polycarbonate resin (I) being contained at a proportion of 30 parts by weight to 95 parts by weight based on the composition comprising the polycarbonate resins (I) and (II).
    Type: Grant
    Filed: December 31, 1986
    Date of Patent: July 25, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventor: Toshiyuki Yoshihara
  • Patent number: 4847175
    Abstract: A reusable electrophotographic imaging element having a photoconductive surface layer of which the binder resin comprises a crystalline side chain polyester or a block copolyester or copolycarbonate having a crystalline side chain polyester block. The layer has low surface adhesion which improves the transfer of toner images to receiver sheets, improves the cleaning efficiency and prevents or reduces toner scumming on the surface layer.
    Type: Grant
    Filed: December 2, 1987
    Date of Patent: July 11, 1989
    Assignee: Eastman Kodak Company
    Inventors: Joseph A. Pavlisko, Hsin-Chia Kan
  • Patent number: 4840860
    Abstract: An improved reusable multiactive electrophotographic element has a charge-transport layer comprising a triarylamin charge-transport material in a mixture of binders comprising poly[2,2-bis(4-hydroxyphenyl)propane carbonate] and a polyester of 4,4'-(2-norbornylidene)diphenol and terephthalic and azelaic acids, with the weight ratio of the polycarbonate to the polyester being in the range of 9:1 to 3:7.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: June 20, 1989
    Assignee: Eastman Kodak Company
    Inventors: William J. Staudenmayer, David S. Weiss, Joseph A. Pavlisko
  • Patent number: 4840861
    Abstract: An improved reusable multiactive electrophotographic element has a charge-transport layer comprising a triarylamine charge-transport material in a mixture of binders comprising poly[2,2-bis(4-hydroxyphenyl)propane carbonate] and a polyester of 2,2-bis(4-hydroxyphenyl)propane and terephthalic and isophthalic acids, with the weight ratio of the polycarbonate to the polyester being in the range of 9:1 to 3:7.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: June 20, 1989
    Assignee: Eastman Kodak Company
    Inventors: William J. Staudenmayer, David S. Weiss, Joseph A. Pavlisko
  • Patent number: 4828952
    Abstract: An electrophotographic printing plate precursor is disclosed, comprising a conductive support having provided thereo1 at least one photoconductive layer containing photoconductive zinc oxide and at least one resin binder, wherein said resin binder contains at least one functional group capable of forming at least one hydroxyl group and at least one carboxyl group upon decomposition. The printing plate precursor can reproduce an image faithful to an original and exhibits satisfactory surface smoothness and electrostatic characteristics. The printing plate produced from the precursor does not cause background stains and exhibits excellent printing durability.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: May 9, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Eiichi Kato, Kazuo Ishii, Ryosuke Itakura, Hidefumi Sera
  • Patent number: 4822706
    Abstract: A persistent conductivity-type electrophotographic recording member comprising a nonconductive layer and a photoconductive layer disposed on one surface of the nonconductive layer, wherein the photoconductive layer comprises a photosensitive material substantially uniformly dispersed in a binder which consists essentially of a copolymer of styrene with at least one alkyl acrylate, the alkyl group of which comprises from four to twelve carbon atoms. The acid value of such copolymers is typically preferably below about 2, and more preferably below about 1.
    Type: Grant
    Filed: February 26, 1988
    Date of Patent: April 18, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Donald J. Carolla
  • Patent number: 4820620
    Abstract: A photocoductive film comprising at least one photosensitive material dispersed in a resinous binder is supersensitized and the dark decay rate thereof reduced by adding an effective amount of an organic acid having at least one carboxyl functional group and at least one hydroxyl functional group to the coating mixture from which the film is formed. The organic acid is an independent component of the coating mixture and is substantially not copolymerized with the binder resin.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: April 11, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Donald J. Carolla
  • Patent number: 4818650
    Abstract: An electrostatographic imaging member and an electrophotographic imaging process for using the imaging member are disclosed in which the imaging member comprises a substrate and at least one electrophotoconductive layer, the imaging member comprising a polymeric arylamine compound represented by the formula: ##STR1## wherein: R is selected from the group consisting of --H, --CH.sub.3, and --C.sub.2 H.sub.5 ;m is between about 4 and about 1,000;A is selected from the group consisting of an arylamine group represented by the formula: ##STR2## wherein: m is 0 or 1,Z is selected from certain specified aromatic and fused ring groups that also contain an oxygen or sulfur atom, certain linear or cyclic hydrocarbon groups, and certain amine groups,Ar is selected from certain specified aromatic groups,Ar' is selected from certain specified aromatic groups, andB is selected from the group consisting of:the arylamine group as defined for A and--Ar--V).sub.
    Type: Grant
    Filed: June 10, 1987
    Date of Patent: April 4, 1989
    Assignee: Xerox Corporation
    Inventors: William W. Limburg, Dale S. Renfer, John F. Yanus, Leon A. Teuscher
  • Patent number: 4818654
    Abstract: An electrophotographic photosensitive member is provided which has an electroconductive substrate and a photosensitive layer, said photosensitive layer containing at least one of (I) polymethyl methacrylates having a molecular weight of 28.times.10.sup.4 or lower, preferably 1.0.times.10.sup.4 to 28.times.10.sup.4 and at least one of (II) polymethyl methacrylates having a molecular weight of 50.times.10.sup.4 to 250.times.10.sup.4, preferably 100.times.10.sup.4 to 250.times.10.sup.4, said polymethyl methacrylate (II) being contained at a proportion of 0.1 part by weight to 30 parts by weight in the composition consisting of the polymethyl methacrylates (I) and (II).
    Type: Grant
    Filed: January 13, 1987
    Date of Patent: April 4, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masaaki Hiro, Toshiyuki Yoshihara
  • Patent number: 4810609
    Abstract: The present invention provides a photosensitive member having a charge transporting layer containing a new enamine compound which has a specific substituent on the terminal carbon of the enamine bone, which give an excellent charge transportability.
    Type: Grant
    Filed: April 7, 1987
    Date of Patent: March 7, 1989
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Hideaki Ueda