Abstract: Aromatic diolefinic compounds including 1,4-divinylbenzene derivatives, which are useful not only as organic photoconductive materials for electrophotography, but also as intermediates for producing diethyl aromatic compounds which are also useful as organic photoconductive materials for electrophotography, the aromatic diethyl compounds, an electrophotographic photoconductor containing any of the above aromatic diethyl compounds in a photosensitive layer thereof, and a charge transporting medium containing any of the aromatic diethyl compound are disclosed.

Abstract: An imaging member comprised of supporting substrate, a photogenerator layer comprised of fluorinated trisazo pigments as essentially represented by the formula ##STR1## wherein X is halogen, i.e. chlorine or fluorine, and Y and Z are selected from the group consisting of H, F, Cl, Br, alkyl containing of from 1 to 25 carbon atoms, CF.sub.3, NO.sub.2, alkoxy, and OH in the anilide coupler moiety, and wherein at least one of the substituents X, Y and Z is F or CF.sub.3, and a charge transport layer.

Abstract: An electrophotographic photoreceptor and a method for producing the same are disclosed, in which stability of coating solution of a photoreceptive layer is improved. The photoreceptor comprises a conductive support having thereon a photoreceptive layer containing a binder, a titanylphthalocyanine which has a peak in X-ray diffraction spectrum thereof by Cu-K.alpha. ray at a Bragg angle 2.theta. of 27.2.degree..+-.0.2.degree., and an organic solvent soluble phthalocyanine represented by the following formula I; ##STR1## wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are each an alkyl group, an alkoxy group or a an aryloxy group, these groups each may have a substituent; M is a metal atom; Y is a halogen atom, an oxygen atom, a hydroxy group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, or a siloxy group, these organic groups may have a substituent; k, 1, m and n are each an integer of 0, 1, 2, 3 or 4; and p is an integer of 0, 1 or 2.

Abstract: An electrophotographic photoreceptor is disclosed, comprising an electroconductive support having a light-sensitive layer containing a charge generating substance and a charge transporting substance, wherein said charge transporting substance is a 1,4-benzodithiafulvene derivative represented by formula (I): ##STR1## wherein R.sup.1 represents a lower alkyl group, a benzyl group, a naphthyl group, or a phenyl group which may contain a substituent; R.sup.2 represents a phenyl group which may contain a substituent or an N-alkyl-substituted carbazole group; R.sup.3 represents a hydrogen atom or a phenyl group which may contain a substituent; R.sup.4 represents a hydrogen atom, a lower alkyl group, a hydroxyl group, or an alkoxy group or an aryloxy group represented by OR.sup.5 ; R.sup.5 represents a lower alkyl group, a benzyl group, or a phenyl group which may contain a substituent; and n represents an integer of 0 or 1.

Abstract: An electrophotographic photosensitive member has an electroconductive support and a photosensitive layer formed thereon. The photosensitive layer contains a compound represented by the general formula (1) below: ##STR1## wherein Z.sub.1 and Z.sub.2 are each independently a hydrogen atom, an alkyl group, a halogen atom, an alkoxy group, a nitro group, a cyano group, or a trifluoromethyl group; A.sub.1 and A.sub.2 are each a coupler residue having a phenolic hydroxyl group, which may be the same or different; and n is an integer of 1 or 2.

Abstract: Aromatic diolefinic compounds including 1,4-divinylbenzene derivatives, which are useful not only as organic photoconductive materials for electrophotography, but also as intermediates for producing diethyl aromatic compounds which are also useful as organic photoconductive materials for electrophotography, the aromatic diethyl compounds, an electrophotographic photoconductor containing any of the above aromatic diethyl compounds in a photosensitive layer thereof, and a charge transporting medium containing any of the aromatic diethyl compound are disclosed.

Abstract: An electrophotographic photosensitive member has a conductive support and a photosensitive layer provided on said conductive support. Said photosensitive layer contains an azo pigment.

Abstract: Oxidation- and corrosion-resistant alloy for components for a medium temperature range based on doped iron aluminide Fe.sub.3 Al having the following composition:Al=24-28 at.-%Nb=0.1-2 at.-%Cr=0.1-10 at.-%B=0.1-1 at.-%Si=0.1-2 at.-%Fe=remainder.At 550.degree. C. high temperature yield points of 500 to more than 650 MPa are obtained.

Abstract: An electrophotographic recording material comprising on an electrically conductive support a negatively chargeable photoconductive recording layer which contains in an electrically insulating organic polymer binder material at least one photoconductive n-type pigment substance and at least one p-type photoconductive charge transport substance as defined herein by a general formula (I) to (V), wherein said layer has a thickness in the range of 4 to 40 .mu.m and comprises 8 to 80% by weight of said n-type pigment substance and 0.01 to 40% by weight of said p-type charge transport substance that is molecularly distributed in said electrically insulating organic polymeric binder material that has a voluem resistivity of at least 10.sup.14 Ohm-m, and wherein said recording layer in electrostatically charged state requires for 10% and 90% discharge respectively exposures to conductivity increasing electromagnetic radiation that differ by a factor 4.5 or less.

Abstract: An electrophotographic photosensitive member comprises an electroconductive support and a photosensitive layer laid on the electroconductive support, the photosensitive layer containing a compound represented by the following general formula (1): ##STR1## wherein R in a substituted or unsubstituted aromatic group or heterocyclic group; X is substituted or unsubstituted benzenediyl, 2,3-pyridinediyl, 3,4-pyridinediyl or 2,3-pyrazinediyl; Y is an oxygen atom, a sulfur atom or a dicyanomethylene group, Z is an oxygen atom, a sulfur atom, a dicyanomethylene group or ##STR2## m is an integer of 1 2 or 3; and n is an integer of 0 or 1.

Abstract: A novel electrophotographic photoreceptor is provided comprising on an electrically conductive support a layer containing a charge carrier-transporting compound and a charge carrier-generating compound or a charge carrier-transporting compound-containing layer and a charge-generating compound-containing layer, characterized in that as said charge carrier-generating compound there is contained a novel bisazo compound represented by the general formula (1-A), (1-B) or (1-C):Cp--N.dbd.N--Ar.sup.1 --C.tbd.C--.sub.n Ar.sup.2 --N.dbd.N--Cp (1-A)wherein Ar.sup.1 and Ar.sup.2 each represents an arylene group, divalent condensed polycyclic aromatic group or divalent heterocyclic aromatic group; Cp represents a coupler residue; and n represents an integer 2 or 3;Cp--N.dbd.N--Ar.sup.1 --C.tbd.C--Ar.sup.2 --C.tbd.C--Ar.sup.3 --C.tbd.C--Ar.sup.4 --N.dbd.N--Cp (1-B)wherein Ar.sup.1, Ar.sup.2, Ar.sup.3 and Ar.sup.

Abstract: An electrophotographic photoconductor comprises an electroconductive support and a photoconductive layer formed thereon comprising a bisazo compound having the formula (I) serving as a charge generating material: ##STR1## wherein Y represents a halogen, an alkyl group which may have a substituent, an alkoxyl group, an acyl group, a substituted amino group, a cyano group or a nitro group; R represents hydrogen, or an alkyl group which may have a substitutent; and Ar represents an aryl group which may have a substituent.

Abstract: A novel electrophotographic photoreceptor is provided comprising a light-sensitive layer containing at least one of acetylene compounds represented by general formula (I) provided on an electrically conductive support:Ar.sup.1 C.tbd.C--AR.sup.3 --C.tbd.C--AR.sup.2 (I)wherein Ar.sup.1 and Ar.sup.2 each represents an aromatic carbon ring or aromatic heterocyclic group; and Ar.sup.3 represents an arylene group, divalent condensed polycyclic aromatic group or divalent aromatic heterocyclic group.

Abstract: An electrophotographic photosensitive member comprising: a conductive substrate and a photosensitive layer on the conductive substrate, said photosensitive layer containing an azo pigment of the following formula (1):CP.sub.1 --N.dbd.N--Ar.sub.1 --(N.dbd.N--Ar.sub.2)--N.dbd.N--Cp.sub.2. . . (1)wherein Ar.sub.1 and Ar.sub.2 are each a substituted or unsubstituted aromatic cyclic group optionally bonded through a bonding group or a substituted or unsubstituted heterocyclic group optionally bonded through a bonding group, and cp.sub.1 and cp.sub.2 are each a group having the following formula (2), (3), (4) or (5): ##STR1## wherein R.sub.1 and R.sub.

Abstract: A photosensitive member for electrophotography, comprising an electroconductive substrate and a photosensitive layer disposed thereon, wherein the photosensitive layer comprises a pyrene compound represented by the following general formula (I): ##STR1## wherein Ar.sub.1 and Ar.sub.2 respectively denote and aromatic hydrocarbon group capable of having a substituent, or an aromatic heterocyclic group capable of having a substituent.

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 an azo compound containing an organic residue represented by general formula (1): ##STR1## wherein Ar.sup.2 represents a divalent aromatic hydrocarbon or aromatic heterocyclic group; Ar.sup.3 represents an aromatic hydrocarbon group or aromatic heterocyclic group; and Q represents a hydrogen atom, halogen atom, alkyl group, trifluoromethyl group, nitro group, cyano group or alkoxy group. In a preferred embodiment, the azo compound is represented by the general formula (2): ##STR2## wherein Ar.sup.1 represents an aromatic hydrocarbon group or aromatic heterocyclic group which may be connected thereto via a connecting group; Ar.sup.2 and Ar.sup.

Abstract: An electrophotographic light-sensitive material comprising a conductive support having formed thereon a light-sensitive layer containing a squarylium compound represented by formula (I) or (II) ##STR1## wherein R.sub.1 represents a hydrogen atom, a methyl group, a carboxy group, a halogen atom, a trifluoromethyl group, an alkyl or phenyl-substituted carbonamido group, or an alkyl- or phenyl-substituted sulfonamido group; X.sub.1 and X.sub.2 each represents a group shown by ##STR2## wherein Z represents an atomic group necessary for forming a ring and R.sub.2 and R.sub.3, each represents an alkyl group having from 1 to 20 carbon atoms, a phenyl group, an unsubstituted benzyl group, or a benzyl group substituted by at least one of an alkyl group having from 1 to 6 carbon atoms, a hydroxy group, an alkoxy group having from 1 to 4 carbon atoms, a halogen atom, a nitro group, a cyano group, an alkoxycarbonyl group having from 2 to 5 carbon atoms, and a trifluoromethyl group); and X.sub.

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 member has a photosensitive layer on an electroconductive support. The photosensitive layer comprises a compound represented by the general formula (1) or (2) having in the molecule thereof an electron-donating portion and an electron-accepting portion: ##STR1## where D is an electron-donating aromatic group or an electron-donating heterocyclic group; A is an electron-accepting aromatic group or an electron-accepting heterocyclic group; B is a hydrogen atom, or an aromatic or heterocyclic group which may form a ring together with A or D; m is an integer of 1, 2 or 3; and n is an integer of 0 or 1.

Abstract: This invention provides azamethine compounds represented by the formula (I): ##STR1## (wherein X represents ##STR2## Y represents C.dbd.O, C.dbd.C(CN).sub.2 or SO.sub.2 ; R.sub.1 to R.sub.4 represent independently a hydrogen atom, an alkyl group which may be substituted, an alkoxyl group which may be substituted, a halogen atom, a nitro group, a cyano group, a hydroxyl group, an amino group which may be substituted, --A--R or ##STR3## R.sub.5 and R.sub.6 represent independently a hydrogen atom, an alkyl group which may be substituted, an aryl group which may be substituted or a cyclohexyl group; R.sub.5 and R.sub.6 may be combined to form a ring or may form a ring with a hetero atom; R.sub.7 and R.sub.

Abstract: Disclosed is an electrophotographic photoreceptor which is high is sensitivity and high in endurance and which contains in photosensitive layer a novel stilbene compound represented by the following formulas [I], [II], or [III]: ##STR1##

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 recording material comprising a conductive support and a photosensitive layer containing a photoconductive compound that has p-type charge generating capacity and is a trisazo compound which is the reaction product of the coupling reaction between a coupler compound that does not contain a carboxylic acid or sulphonic acid group and a diazonium salt represented by the following general formula (I): ##STR1## wherein: each of L, M and Y (same or different) represents a phenylene group including a phenylene groups substituted with one or more substituents selected from the group consisting of lower alkyl (C.sub.1 -C.sub.2), nitro, methoxy, ethoxy or halogen, or represents said phenylene group fused-on with the necessary atoms to close a saturated or unsaturated carbocyclic or heterocyclic ring or ring system including said ring or ring-system in substituted form, and X.sup.- is an anion.

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 electrophotograph photosensitive material comprising a photosensitive layer containing an azo pigment on an electroconductive substrate thereof, wherein said azo pigment in which an organic comprises residual group as expressed by the following general formula (I) bonded to an aromatic hydrocarbon group or an aromatic heterocyclic group optionally via a bonding or coupling group: ##STR1## wherein X is a residual group for forming an aromatic hydrocarbon group or an aromatic heterocyclic group condensed with a benzene ring, A is --NR.sub.4 -- wherein R.sub.4 is a hydrogen atom, alkyl group, aralkyl group or aryl group, R.sub.1 is a hydrogen atom, alkyl group, aralkyl group or aryl group, and R.sub.2 and R.sub.3 each is a hydrogen atom, alkyl group, aralkyl group, carbamoyl group, aryl group, heterocyclic group, halogen atom, nitro group, acyl group, cyano group or together, R.sub.2 and R.sub.3 form a ring and are the same or different from each other.

Abstract: Indenylidene compounds, which are useful not only as the photoconductive material for electrophotography, but also as a charge transporting material employed in a function-separating type photoconductor in which an organic or inorganic pigment is used as a charge generating material, and an electrophotographic photoconductor containing at least one of the above indenylidene compounds in a photoconductive layer thereof, are disclosed.

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: 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: 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 invention relates to 4-chlorooxazole derivatives of the general formula I ##STR1## which carry an unsaturated group in the 2- or 5-position, e.g., the --CH.dbd.CH-- or --CH.dbd.CH--CH.dbd.CH-- group.In the formulaR.sub.1 is phenyl, which is optionally substituted in one or more positions by (C.sub.1 -C.sub.4)-alkoxy or di-(C.sub.1 -C.sub.4)-alkylamino radicals andR.sub.2 is phenyl, phenyloxazolyl, pyridyl, julolidin-9-yl, N-(C.sub.1 -C.sub.4 -alkyl)-carbazol-3-yl, coumarin-6-yl, or stilben-4-yl, which are optionally substituted in one or more positions by (C.sub.1 -C.sub.4)-alkyl, (C.sub.1-C.sub.4)-alkoxy, halogen-(C.sub.1 -C.sub.4)-alioxy, hydroxy, halogen, di-(C.sub.1 -C.sub.4)-alkylamino, or dibenzylamino radicals.The compounds are used as photoconductive substances.

Abstract: A hydroxy arylamine compound is disclosed represented by the formula: ##STR1## wherein: m is 0 or 1,Z is selected from the group consisting of: ##STR2## n is 0 or 1, Ar is selected from the group consisting of: ##STR3## R is selected from the group consisting of --CH.sub.3, --C.sub.2 H.sub.5, --C.sub.3 H.sub.7, and --C.sub.4 H.sub.9,Ar' is selected from the group consisting of: ##STR4## X is selected from the group consisting of: ##STR5## s is 0, 1 or 2, the dihydroxy arylamine compound being free of any direct conjugation between the --OH groups and the nearest nitrogen atom through one or more aromatic rings. The dihydroxy arylamine compound may be employed in an electrophotographic imaging member and the member may be used in an electrophotographic imaging process.

Abstract: An electrophotographic photoconductor is disclosed which comprises an electroconductive support material and a photosensitive layer comprising at least one of the stilbene compounds of the formula ##STR1## wherein R.sup.1 represents hydrogen or ##STR2## R.sup.2 represents hydrogen, an alkyl group or a substituted or unsubstituted phenyl group; A represents ##STR3## when R.sup.1 is hydrogen; while, when R.sup.1 is ##STR4## A represents ##STR5## a 9-anthryl group or a substituted or unsubstituted N-alkylcarbazolyl group, wherein R.sup.3 represents hydrogen, an alkyl group, an alkoxy group, a halogen or a substituted amino group represented by ##STR6## in which R.sup.4 and R.sup.5 independently represent an alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group, and R.sup.4 and R.sup.5 may form a ring in combination, and m is an integer of 0 through 3 and n is an integer of 0 or 1, provided that, when R.sup.1 is hydrogen and n=0, A is ##STR7## in which R.sup.

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 imaging member comprised of a supporting substrate; a photogenerating layer comprised of a bisazo compound of the formula ##STR1## wherein Cp is an azoic coupler selected from the group consisting of ##STR2## wherein Ar is an aromatic substituent; and a charge transport layer.

Abstract: An electrophotographic photoreceptor is disclosed, comprising a conductive support having provided thereon a photosensitive layer containing a bisazo compound respresented by formula (I) ##STR1## wherein Y represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, a cyano group, a nitro group or a hydroxyl 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 photosensitive member has a photosensitive layer on an electroconductive support, wherein said photosensitive layer contains a compound represented by the formula: ##STR1## [wherein Ar.sub.1 represents a phenyl group having one or more group selected from alkoxy groups and alkyl groups, Ar.sub.2 represents a phenyl group having one or more group selected from nitro group, cyano group and halogen atoms, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, R.sub.10, R.sub.11 and R.sub.12 represnt hydrogen atom, halogen atom, alkyl group, aralkyl group, alkoxy group, nitro group, cyano group, trifluoromethyl group or substituted amino group, with proviso that R.sub.5 and R.sub.6, R.sub.6 and R.sub.7, R.sub.7 and R.sub.8, R.sub.9 and R.sub.10, R.sub.10 and R.sub.11, R.sub.11 and R.sub.12 may form a fused aromatic ring together with a part of the carbazole ring].

Abstract: The invention provides an electrophotographic photosensitive member having an improved sensitivity and an improved potential stability when repeatedly copied by using a photosensitive layer containing a disazo pigment having a specific molecular structure.

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: Light-sensitive compositions are provided, containing at least one bisazulenium salt compound of the general formulae (1) and (2): ##STR1## wherein all the symbols are defined in the specification. Electrophotographic photoreceptors containing the present composition have high sensitivity and stable potential characteristic in repeated use. The present compositions are further usable in optical information-recording media, and the media containing the present composition have sufficient preservation stability, high sensitivity and sufficient S/N ratio.

Abstract: An electrophotographic photosensitive member having a photesensitive layer containing an azo compound represented by the following Formula [I],Formula [I] ##STR1## wherein Y.sub.1, Y.sub.2, Y.sub.3 and Y.sub.4 each is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom; A.sub.1 and A.sub.2 each represents ##STR2## wherein Z is a group of atoms necessary to complete a substituted or unsubstituted aromatic carbocyclic ring of a substituted or unsubstituted aromatic heterocyclic ring; Q.sub.3 is substituted or unsubstituted carbamoyl group or a substituted or unsubstituted sulfamoyl group; R.sub.1 is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted amino group, a substituted or unsubstituted carbamoyl group, a carboxyl group, a carboxyl group or ester group thereof, or a cyano group; A' is a substituted or unsubstituted aryl group; and R.sub.2 and R.sub.

Abstract: An electrophotographic photosensitive member comprises a photosensitive layer containing an azo pigment selected from the following general formulae (1) to (5): ##STR1## wherein groups Ar are arylene groups and divalent heterocyclic groups, each of which may contain a substituent; n is 0 or 1; and group A is a coupler residue group having a phenolic OH group.

Abstract: A dual layer photoreceptor for use in electrophotography, wherein a charge transport layer containing a hydrazone compound and a binder polymer is laminated on a charge generation layer containing a titanium phthalocyanine compound of the formula: ##STR1## wherein X represents hydrogen atom, lower alkyl group, lower alkoxy group, allyloxy group, nitro group, cyano group, hydroxy group, benzyloxy group or halogen atom, Y represents halogen atom, alkoxy group or oxygen atom, n represents an integer of 1 or 2 and m represents an integer of 0 to 4, and a binder polymer, formed on an electroconductive substrate.

Abstract: An electrophotographic photoreceptor is disclosed, comprising a conductive support having provided thereon a light-sensitive layer containing at least one of a specific type of bisstilbene compound as a photoconductive substance or a charge transporting material. The photoreceptor has high sensitivity, a small residual potential, and stability to ozone, light, or heat.

Abstract: A photoreceptor comprising a support and thereon a photosensitive layer containing an azo compound.

Abstract: There is disclosed an electrophotographic photoreceptor comprising an electroconductive support and, provided thereon, a photosensitive layer containing (A) a trisazo pigment formed by the reaction between a coupler component represented by the following general formula (I) and a diazonium salt represented by the following general formula (II) or (B) a bisazo pigment represented by the following general formula (III): ##STR1## wherein Z is a substituted or unsubstituted hydrocarbon ring or a group of atoms necessary to complete a substituted or unsubstituted hetero ring, R is oxygen, sulfur, or --NR'--, Y is a chain hydrocarbon necessary to complete a 5- or 6-membered ring, and R' is hydrogen or an alkyl, benzyl, or aryl group which may have a substituent; ##STR2## wherein A is a trivalent moiety whose carbon atom is bonded to nitrogen atom forming azo group and X.crclbar.

Abstract: An electrophotographic material comprises a conductive support and a light-sensitive layer containing at least one of the azo compound of the formulas [I]-[III]:formula [I]:Cp.sub.1 --N.dbd.N--A--N.dbd.N--Cp.sub.2A represents a divalent residue which bonds through C atoms to N atoms which constitute azo and Cp.sub.1 is a group of by the formula: ##STR1## Z represents a substituted or unsubstituted carbocyclic aromatic ring, a substituted or unsubstituted heterocyclic aromatic ring or a unsaturated monocyclic hydrocarbon ring and R represents an aryl group containing one or two CF.sub.3 groups and Cp.sub.2 is a coupler residue different from said Cp.sub.1 and is selected from following formulas (a)-(f): ##STR2## Z.sup.1 and Z.sup.2 represent a substituted or unsubstituted aromatic hydrocarbon ring or substituted or unsubstituted hetero ring, R.sup.1 and R.sup.2 represent substituted or unsubstituted alkyl, aralkyl, aryl or hetero ring group, R.sup.3 represents an alkyl or carboxyl group or an ester thereof, R.

Abstract: An electrophotographic photosensitive material has a photosensitive layer formed on an electroconductive substrate, with the photosensitive layer containing a polymeric binder and an organic photoconductor represented by the following formulaA--CH.dbd.CH).sub.n CH.dbd.NNHYwherein A is selected from the group consisting of an alkyl group having 1 to 12 carbon atoms, an aralkyl group having 7 to 14 carbon atoms, an aryl group having 6 to 20 carbon atoms and a heterocyclic residue of a 3- to 30- membered ring,wherein n is 1 or 2,Y is selected from the group consisting of --SO.sub.2 R', ##STR1## wherein R' is selected from the group consisting of an alkyl group having 1 to 12 carbon atoms, an aralkyl group having 7 to 14 carbon atoms, an aryl group having 6 to 20 carbon atoms and a heterocyclic residue of a 3- to 30- membered ring, and R.sup.2 and R.sup.3, R.sup.4 and R.sup.5, either form a ring together with the nitrogen atom to which R.sup.2 and R.sup.3, R.sup.4 and R.sup.5 are bonded and in this case R.sup.

Abstract: Disclosed is an electrophotographic photoconductive material excellent in sensitivity and durability which comprises an electroconductive substrate and, provided thereon, a photosensitive layer containing a trisazo pigment represented by the general formula ##STR1## wherein R's, which may be the same or different, represent each a hydrogen atom, halogen atom, substituted or unsubstituted alkyl group, alkoxyl group, or nitrile group; n is an integer of 1 or 2; and A represents ##STR2## wherein Z represents a group of atoms necessary to complete a substituted or unsubstituted aromatic carbon ring or a substituted or unsubstituted aromatic hetero-ring; X represents a hydrogen atom, an alkyl group, or a group of atoms necessary to complete a substituted or unsubstituted aromatic carbon ring, a substituted or unsubstituted aromatic hetero ring, or a substituted or unsubstituted hetero ring; m is 0 or 1; B represents a group of atoms necessary to complete a substituted or unsubstituted aromatic carbon ring, a subst