Abstract: A novel electrophotographic photoreceptor is provided comprising on an electrically conductive support a layer containing a charge-transporting compound and a charge-generating compound or a charge-transporting compound-containing layer and a charge-generating compound-containing layer, characterized in that as said electric charge-generating compound there is contained a tetrakisazo compound represented by the general formula (1): ##STR1## wherein Ar.sup.1, Ar.sup.2, Ar.sup.3, Ar.sup.4, Ar.sup.5, Ar.sup.6 and Ar.sup.7 each represents an arylene group, divalent condensed polycyclic aromatic group or divalent heterocyclic aromatic group; and Cp represents a coupler residue.

Abstract: This invention provides an electrophotographic photoreceptor which is high in durability and high in sensitivity. This photoreceptor comprises an electroconductive support and, provided thereon, a photosensitive layer containing an azo pigment represented by the following formula [I] or [II]: ##STR1## wherein A represents a hydrogen atom, an alkyl group, a phenyl group or a heterocyclic ring group, m and n each represents 0 or 1, X represents a hydrogen atom, a lower alkyl group, a cyano group or a halogen atom and Cp represents a coupler residue, or ##STR2## wherein Z represents an alkyl group, a phenyl group or a heterocyclic ring group, X represents a hydrogen atom, a lower alkyl group, a cyano group or a halogen atom and Cp represents a coupler residue.

Abstract: An electrophotographic photosensitive material includes a photosensitive layer which is formed on a conductive support body and which contains an azo pigment expressed by Formula (1) described below, wherein at least one Cp in the Formula (1) is a coupler residue expressed by Formula (2) described below.Ar--N.dbd.N--CP).sub.n (1)wherein Ar is an aromatic hydrocarbon or aromatic heterocyclic group, Cp is a coupler reside having a phenolic hydroxyl group, and n is an integer of 1, 2, 3 or 4. ##STR1## wherein R.sub.1 and R.sub.2 each is a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, a halomethyl group, a cyano group or a nitro group.

Abstract: The present invention relates to the photosensitive member which provides at least a charge generating layer and charge transporting layer on an electrically conductive substrate, the charge transporting layer contains a polycarbonate resin I of at least first type polycarbonate resin having a mean molecular weight of 2-4.times.10.sup.4 and a polycarbonate resin II of at least second type polycarbonate resin having a mean molecular weight of 4-6.5.times.10.sup.4, said polycarbonate resin I contributing between 5 and 50 parts by weight of the combined ratio of polycarbonate resins I and II.

Abstract: A photoconductor for electrophotography comprises an electroconductive substrate and a photoconductive layer formed on the substrate and including a novel disazo compound as a charge generating layer. The disazo compound is represented by the following general formula: ##STR1## wherein X1 stands for one of an alkyl group, an aryl group and an aromatic heterocyclic group, each of which groups may be or not may be substituted, X.sub.2 stands for one of a hydrogen atom, a cyano group, a carbamoyl group, a carboxyl group, an ester group and an acyl group, each of X.sub.3 and X.sub.4 stands for one of a hydrogen atom, a halogen atom, a nitro group, an alkyl group and an alkoxyl group, both of last two groups may be or not may be substituted, Z stands for one of a hydrogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, an aryl group and an aromatic heterocyclic group, each of which groups may be or not may be substituted and --N.dbd.N--D--N--N.dbd.N-- stands for a disazo residual group.

Abstract: An electrophotographic photosensitive member having a photosensitive layer is formed on a support and contains an azo pigment expressed by a general formula [I] or [II]: ##STR1## where A, B.sub.1 and B.sub.2 are aromatic hydrocarbon nucleus groups or heterocyclic groups which may be optionally linked by coupler groups, A is an univalent group, B.sub.1 is an univalent, bivalent or trivalent group, and B.sub.2 is a bivalent or trivalent group; X is a residue necessary for forming a polycyclic aromatic nucleus or a heterocycle by condensation with a benzene nucleus; R is a halogen atom, an alkyl group or an alkoxy group; n.sub.1 is an integer from 1 to 3; and n.sub.2 is an integer from 1 to 3. This photosensitive layer may be composed of a charge generation layer containing the above azo pigment and a charge transport layer.

Abstract: An electrophotographic photoreceptor is disclosed, which comprises an electrically conductive support having thereon a layer which contains a charge carrier transporting compound and a charge carrier generating compound, or a layer which contains charge carrier transporting compound and a layer which contains a charge generating compound, wherein at least one type of tris-azo compound represented by formula (I) is included as a charge carrier generating compound: ##STR1## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3, Ar.sub.4 and A are as defined in the specification.

Abstract: A photoreceptor including a carrier transporting layer containing a carrier transporting material and a binder material, and a carrier generating layer containing a carrier generating material and a binder material, the layers being placed one over the other in order of mention, characterized in that said carrier generating layer contains a metal-free phthalocyanine having main peaks of Bragg angles 2.theta. at least at 7.5 degrees.+-.0.2 degrees, 9.1 degrees .+-.0.2 degrees, 16.7 degrees.+-.0.2 degrees, 17.3 degrees.+-.0.2 degrees, and 22.3 degrees.+-.0.2 degrees in relation to CuK.alpha. characteristic X rays (wavelength 1.541 .ANG.), and in that said carrier generating layer also contains a carrier transporting material.

Abstract: An electrophotographic photoreceptor is described, comprising a photosensitive layer disposed on a conductive substrate, said photosensitive layer having a laminated structure comprising an electric charge generating layer and an electric charge transporting layer, said electric charge generating layer containing a phthalocyanine pigment which is selected from .epsilon.-type copper phthalocyanine, X-type or .tau.-type phtalocyanine, indium chloride phthalocyanine, calcium chloride phthalocyanine, and magnesium phthalocyanine, one of the benzene rings of the aluminum chloride or indium chloride phthalocyanine being optionally monochlorinated, and said electric charge transporting layer containing at least one hydrazone compound represented by formula (I) or (II) as set below: ##STR1## wherein the substituents are as defined in the specification.

Abstract: The first aspect of this invention resides in providing an .alpha.-type titanyl phthalocyanine composition comprising an .alpha.-type titanyl phthalocyanine and metal-free phthalocyanine. This .alpha.-type titanyl phthalocyanine composition is stable, wide in range of absorption wavelengths, and high in spectral sensitivity because it contains an .alpha.-type titanyl phthalocyanine in combination with metal-free phthalocyanine.The second aspect of this invention resides in providing a method for the production of an .alpha.-type titanyl phthalocyanine composition comprising an .alpha.-type titanyl phthalocyanine and a metal-free phthalocyanine, which method comprises pigmenting a concentrated sulfuric acid solution containing at least titanyl phthalocyanine by the acid paste process consisting in pouring said concentrated sulfuric acid solution into water. By this method, an .alpha.-type titanyl phthalocyanine composition stable to withstand the impact of aging can be easily produced.

Abstract: An electrophotographic recording element comprising a combination of photoconductive perylene materials that are dispersed in a binder to form layers having excellent photosensitivity and resistance to abrasion. The materials are perylene-3,4,9,10-tetracarboxylic acid imide derivatives that contain a phenethyl radical bonded to a 3,4-dicarboximide nitrogen atom.

Abstract: The present invention relates to a photosensitive member containing a specific azo compound represented by the following general formula [I]; ##STR1## wherein A is a bivalent group of a condensed poly-cyclic ring which may have a substituent, a pyridine which may have a substituent, a diazine which may have a substituent, a quinoline which may have a substituent, or a benzoazine which may have a substituent; Cp is a residual group of a coupler, which is improved in photosensitive porperties, in particular, sensitivity.

Abstract: A photoconductor for electrophotography comprises a novel azulenium compound as a charge generating substance. An azulenium compound is represented by the following general formula: ##STR1## Wherein, each of R.sub.1 to R.sub.9 stands for a hydrogen atom, a halogen atom, an alkoxy group, or an alkyl group, an aryl group, both of which may have a substituent(s), and X.sup..crclbar. stands for an anion residual group.

Abstract: High resolution, photosensitive electrostatic master which is positive-working with a single imagewise exposure comprising a conductive support bearing a layer of a photosensitive composition consisting essentially of (A) at least one polymeric binder, (B) a hexaarylbiimidazole photooxidant, (C) leuco dye, preferably stabilized, oxidized by (B), (D) a nonionic halogenated compound, preferably a hydrocarbon, and (E) compatible plasticizer. A process of making positive images by a single imagewise exposure is described. The master is useful in making proofs that duplicate the image achieved by printing, etc.

Abstract: The present invention relates to a photosensitive member containing a specific bisazo compound described by general structural formula[I] and formed on an electrically conductive substrate; ##STR1## Wherein X is a hydrogen atom, halogen atom, alkyl radical, alkoxi radical, nitro radical or cyano radical; A is a diatomic radical selected from among the following: ##STR2## B is a coupler described by formulae [II] through [VI]; ##STR3## R is a hydrogen atom, halogen atom, alkyl radical, alkoxi radical, nitro radical or cyano radical; and Y is an aromatic carbocyclic residue or aromatic heterocyclic residue, each of which may have a substituent; G is a carbamoyl radical or sulfamoyl radical and may have a substituent; R.sub.1 is a hydrogen atom, alkyl radical, amino radical or carbamoyl radical, each of which may have a substituent, a carboxyl radical or cyano radical; M is an aryl group which may have a substituent, which is improved in photosensitivity and dispersibility.

Abstract: An electrophotographic photoreceptor having on a conductive support a photoconductive layer containing a specific azo compound is disclosed.

Abstract: The present invention relates to a photosensitive member containing a specific azo compound for a charge generating agent, which is improved in photosensitive properties, in particular, sensitivity. The specific azo compound is represented by the formula (1): ##STR1## wherein A represents an aromatic hydrocarbon or a heterocyclic ring; R.sub.1 and R.sub.2 independently represent a hydrogen, a halogen atom, or an alkyl, aralkyl, aryl, condensed polycyclic ring or condensed heterocyclic ring; or R.sub.1 and R.sub.2 combinedly form a cyclic ring; n represents an integer from 1 to 4.

Abstract: An electrophotographic photoreceptor is provided with a photosensitive layer, which contains an azo compound having in the molecule thereof at least one azo group coupled with a coupler residuum represented by the following general formula (I): ##STR1## wherein X means a residuum capable of condensing with a benzene ring to form a substituted or unsubstituted aromatic hydrocarbon ring or a substituted or unsubstituted aromatic heterocyclic ring, Y denotes a hydrogen or halogen atom or alkyl or alkoxy group, and n stands for an integer of 0-3.

Abstract: A photoconductor for electrophotography, including an electroconductive substrate; and a photosensitive layer formed on the electroconductive substrate and including a nobel azo compound or disazo compound as a charge generating substance. An azo compound is represented by the following general formula: ##STR1## wherein each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 stands for a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, an alkoxy group, an allyl group, an aryl group, an aralkyl group, a carboxyl group or an ester group, and C.sub.p stands for a residual group of a coupler.

Abstract: An electrophotographic photoconductor is disclosed which comprises an electroconductive support and a photoconductive layer formed thereon, which photoconductive layer comprises as a charge generating material an azo pigment having general formula (I): ##STR1## wherein R.sup.1, R.sup.2, X, A and n are respectively defined in the specification.

Abstract: Disclosed herein is a photoreceptor for electrophotography comprising a conductive substrate and a photosensitive layer thereon containing an azo compound represented by the formula (I):A-N=N-D-N=N-B (I)wherein A represents a coupling component derived from the following formula (II): ##STR1## wherein Q represents a divalent group derived from an aromatic hydrocarbon which may have one or more substituents or a divalent group derived from a heterocyclic compound which may have one or more substituents, B represents a different coupling component having a phenolic hydroxyl group from said A, and D represents a divalent group in which the carbon atoms bonded to the azo groups are SP.sup.2 carbon atoms forming double bonds.

Abstract: An optical recording medium having a recording layer provided on a substrate, said recording layer comprising an organic thin film containing at least one diazulenium salt compound represented by the formula [I], [II] or [III], and a recording method using it.

Abstract: A photosensitive member for electrophotography which comprises a photosensitive layer containing at least one member of the group consisting of thiophene structure-containing azo compounds having one of the general formulae (I) to (X): ##STR1## wherein all the symbols are defined in the specification.

Abstract: This provides an electrophotographic photoreceptor high in durability and sensitivity which comprises an electroconductive support and, provided thereon, a photosensitive layer containing an azo pigment represented by the formula [I]: ##STR1## wherein A represents an aryl group, a heterocyclic group or an alkyl group, Z represents a hydrogen atom, --B or --CH.dbd.CH--B wherein B represents an aryl group, a heterocyclic group or an alkyl group and Cp represents a coupler residue.

Abstract: According to the present invention, by using in combination a styryl compound expressed by general formula [I] or [II] and a bisazo pigment expressed by general formula [III] below, a highly sensitive and durable photoconductive coat which exhibits a low residual electric potential and is free from deterioration caused by fatigue through repeated use and an electrophotosensitive article provided with such a coat are obtained.Therefore, the present invention finds its applications in electronic photocopying devices, laserbeam printers, LED printers, CRT printers and other devices of electronic photography.

Abstract: An electrophotographic apparatus comprises at least a charging means, an imagewise exposure means with a laser beam having a spot diameter of 100 um or less, a developing means, a transferring means and a cleaning means arranged around an electrophotographic photosensitive member, and said electrophotographic photosensitive member comprises a charge generation material and a charge transport material comprising an organic photoconductive material and has a surface layer containing said charge transport material, wherein the absorption end of visible to UV spectroscopic absorption of the surface layer is substantially unchanged by exposure to nitric acid vapor for 10 minutes; an electrophotographic image forming process; and an electrophotographic photosensitive member.

Abstract: A process for preparing a dispersion liquid containing an organic photoconductive azo pigment by use of a solvent is provided which comprises subjecting the azo pigment to a heating treatment in a ketone type solvent as a dispersion pretreatment. The azo pigment is characterized by the general formula (1) wherein R.sub.1 represents a hydrogen atom or a substituted or unsubstituted alkyl group and A represents a coupler residue having a phenolic hydroxyl group.

Abstract: An electrophotographic photosensitive member is disclosed which has a photosensitive layer on an electroconductive support. The photosensitive layer contains a trisazo pigment having the specific structural formula.

Abstract: The present invention relates to a photosensitive member containing a specific styryl compound for a charge transporting material, which is improved in photographic propertied such as photosensitivity and repeating properties.

Abstract: A photoreceptor comprises a conductive substrate, a charge generating layer and a charge transporting layer, the charge generating layer being formed by bonding to the substrate a film layer having a composition consisting of copper phthalocyanine and a binder and then exposing said bonded film to iodine vapor for 1-120 min at 20 deg C.-90 deg C. The charge transporting layer is formed of a binder and an organic compound selected from hydrazones, pyrazolines, oxazoles, thiazoles and triaryl methane.

Abstract: A photoconductor for electrophotography comprises a novel disazo compound as a charge generating substance. A disazo compound is represented by the following general formula: ##STR1## wherein, each of Ar.sub.1 and Ar.sub.2 stands for an aromatic hydrocarbon group or an aromatic heterocyclic group, both of which may have a substituent(s),each of R.sub.1 and R.sub.2 stands for an hydrogen atom or an alkyl group or an aryl group, a heterocyclic group which may have a substituent(s); andC.sub.p stands for a coupler residual group.

Abstract: This invention provides an optical semiconductor material comprising: (1) a noncrystalline titanium phthalocyanine compound which does not show substantial X-ray diffraction peak in X-ray diffraction chart, (2) a pseudo-noncrystalline titanium phthalocyanine compound which shows broad X-ray diffraction peaks at Bragg angles of 6.9.degree., 15.5.degree., 23.4.degree. and 25.5.degree. measured by using CuK.alpha. beam and (3) an assembly of said noncrystalline titanium phthalocyanine compound and pseudo-noncrystalline titanium phthalocyanine compound. Further, this invention provides an electrophotographic plate comprising an electrically conductive substrate, and a charge-generating layer and charge-transferring layer on the electrically conductive substrate, characterized in that the charge-generating layer contains the above noncrystalline and/or pseudo-noncrystalline titanium phthalocyanine compound(s).

Abstract: An electrophotographic plate for making a printing plate is provided. Said electrophotographic plate comprises an electrically conductive and hydrophilic base and a photoconductive layer provided thereon, said photoconductive layer containing an alkali and/or alcohol soluble polymer, a phtalocyanine pigment and a compound represented by the formula (I):(X).sub.n Y (I)where X represents thiobarbituric acid residue from which one hydrogen atom at 5-position has been eliminated and in which nitrogen atom in a ring may have a substituent; Y represents an n-valent substituted or unsubstituted alkylene or aralkylene residue; and n represents an integer of 2 to 4. This plate has high sensitivity and resolving power and from this plate a printing plate of high printing endurance and low printing strain can be made.

Abstract: Disclosed are a photoconductive composition containing a new tetrakisazo compound of the following formula (1) and an electrophotographic photoreceptor having a photosensitive layer which contains the tetrakisazo compound of the formula (1): ##STR1## wherein R.sup.11, R.sup.12, A, Ar.sup.1, Ar.sup.2, Ar.sup.3, Ar.sup.4, Ar.sup.5, and Ar.sup.6 are defined hereinbefore. The electrophotographic photoreceptor has both high sensitivity and high durability, and the sensitivity thereof is barely lowered even after repeated use.

Abstract: A photoconductor for electrophotography comprising a novel squarylium as a charge generating substance. A squarylium compound is represented by the following general formula: ##STR1## wherein, each of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 stands for a hydrogen atom, a halogen atom, an alkyl group, an aryl group, or a nitro group, and each of R.sub.7 and R.sub.8 stands for a hydrogen atom or a hydroxy group.

Abstract: The present invention uses an azo pigment having in the center of an N-oxide heterocyclic structure as a photoelectrical charge-generating material. The pigments are excellent in dispersion stability in a dispersed solution, and enable the provision of a photosensitive member excellent in sensitivity properties.

Abstract: The present invention relates to a photosensitive member containing a specific azo compound for a charge generating agent, which is improved in photosensitive properties, in particular, sensitivity.

Abstract: An electrophotographic printing plate comprises a substrate having formed thereon a photoconductive layer comprising (a) a disazo based compound, (b) a perynone based compound, (c) a hole transport material, and (d) an alkali-soluble resin.

Abstract: A photoconductive film includes at least one kind of bis-azo pigments and exhibits a high sensitivity. The film may be used as an electrophotographic light-sensitive element.

Abstract: A photoconductive composition containing at least one of azaazulenium salt compounds represented by the following formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each represents a hydrogen atom, a halogen atom, a hydroxyl group, a nitro group, a carboxyl group, a sulfonic acid group, a mercapto group or a monovalent organic residue; A represents a divalent organic group bonded by the double bond; X.sup..crclbar. represents an anionic group; n is the number of X.sup..crclbar. groups required to balance the positive charge; provided that each X.sup..crclbar. group may be bonded to any of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 or A to form an inner salt; and any two of R.sub.2, R.sup.3, R.sub.4, R.sub.5 and R.sub.6 bonded to adjacent carbon atoms may be linked to form a substituted or unsubstituted aromatic carbocyclic or aromatic heterocyclic ring.

Abstract: An electrophotographic photoreceptor comprising an electrically conductive support having provided thereon a photosensitive layer composed of a charge generating layer and a charge transport layer, wherein said charge generating layer contains a bisazo compound represented by formula (I) ##STR1## wherein X, Y, and A are defined in the specification, and said charge transport layer contains a benzidine compound represented by formula (II) ##STR2## wherein R.sub.1, R.sub.2, and R.sub.3 are as defined in the specification. The photoreceptor exhibits high photoresponse performance even in a weak electric field and exhibits high sensitivity in a visible light region.

Abstract: A function separated type electrophotographic photosensitive member for infrared rays comprises a combination of a charge generation material and a charge transport material, wherein the electrophotographic photosensitive member for infrared rays contains as the charge generation material a disazo pigment represented by Formula (1).

Abstract: An electrophotographic photoconductor an electroconductive substrate, an intermediate layer comprising a charge generating azo pigment and a thermosetting resin, a charge generating layer and a charge transporting layer, which layers are successively overlaid on the electroconductive substrate, the charge generating azo pigment being any of the azo pigments (1) through (4): ##STR1##

Abstract: An electrophotographic photoreceptor is disclosed, comprising a conductive support having provided thereon a photosensitive layer containing a bisazo compound represented by formula (I) ##STR1## wherein X represents a halogen atom or a nitro group, and A represents a substituted or unsubstituted divalent aromatic hydrocarbon group or a substituted unsubstituted divalent nitrogen-containing heterocyclic group. The photoreceptor exhibits excellent sensitivity and durability.

Abstract: An electrophotographic photoreceptor is described, comprising a photosensitive layer disposed on a conductive substrate, said photosensitive layer having a laminated structure comprising an electric charge generating layer and an electric charge transporting layer, said electric charge generating layer containing a phthalocyanine pigment which is selected from .epsilon.

Abstract: A photosensitive member for electrophotography comprises a photosensitive layer containing a trisazo pigment represented by the formula: ##STR1## wherein Ar.sub.1 is a pyridylene group capable of having a substituent; Ar.sub.2 and Ar.sub.3 are respectively a pyridylene group or an arylene group each capable of having a substituent; and A is a coupler residue having a phenolic OH group. Because the trisazo pigment has a characteristic central skeleton including the central nitrogen atom and an adjacent pyridylene group, the photosensitive member has a sensitivity region expanded to the near-infrared region and shows a stable charging characteristic during a continuous electrophotographic operation.

Abstract: The present invention relates to a photo sensitive member containing a specific azo compound for a charge generating agent, which is improved in photosensitive properties, in particular, sensitivity.

Abstract: An improved layered photoresponsive imaging member comprised of a supporting substrate; a photogenerator layer comprised of cis and trans naphthalene imidazole perylene component of the following formula; ##STR1## and an aryl amine hole transport layer dispersed in a resinous binder.

Abstract: The present invention provides a new photosensitive member, in which a specific disazo pigment is used as a photoconductive material, which is excellent in whole static properties, especially in sensitivity.

Abstract: An electrophotographic recording material is comprised of an electrically conducting film base, an optional, adhesion-promoting, insulating intermediate film and at least one binder-containing photoconductive film that also contains a charge-carrier generating compound and pyrazoline charge-transporting compound represented by the formula ##STR1## in which n denotes zero or 1 andR.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 respectively denote hydrogen or halogen, preferably chlorine or bromine.Such a recording material has a low pre-exposure sensitivity combined with very good photosensitivity, and a low residual charge level in cyclic behavior. The charge-transporting compound has a low tendency to crystallize out in the film.