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: 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 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, wherein said charge-generating compound is a trisazo compound represented by the general formula (1): ##STR1## wherein Ar.sup.1, Ar.sup.2, Ar.sup.3, Ar.sup.4, Ar.sup.5 and Ar.sup.6 each represents an arylene group, divalent condensed polycyclic aromatic group or divalent group derived from a monocyclic or condensed polycyclic heterocyclic aromatic group, each of which may have one or more substituents; C.sub.p respresents a coupler residual group; and n represents 1 or 2.

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 photoreceptor comprising an electrically conductive support and, formed thereon, at least a charge generating layer and a charge transporting layer, the charge generating layer containing a phthalocyanine pigment and, as a resin binder, at least one copolymer which comprises as recurring units at least styrene units and maleic anhydride half ester units represented by the following general formula (I): ##STR1## wherein R represents an alkyl group or an aryl group. The electrophotographic photoreceptor has high sensitivity and excellent durability.

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: An electrophotographic photoreceptor comprising an electroconductive support having thereon a layer containing a charge carrier-transporting compound and a charge carrier-generating compound or having thereon a layer containing a charge carrier-transporting compound and a layer containing a charge carrier-generating compound, wherein the photoreceptor contains a tetrakisazo compound of the following formula (I) as the charge carrier-generating compound: ##STR1## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3, Ar.sub.4, Ar.sub.5 and Ar.sub.6, which may be the same or different, each represents an arylene group, a divalent condensed polycyclic aromatic group or a divalent heterocyclic aromatic group;A represents ##STR2## X represents an atomic group necessary to form an aromatic ring or heterocyclic ring condensed with the benzene ring of the formula having the hydroxyl group and Y bonded thereto;Y represents ##STR3## R.sup.1 represents an alkyl group or a phenyl group; R.sup.

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: 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: A new optical recording medium is herein disclosed, the recording medium comprising a substrate and an optical recording layer formed thereon comprising a dye represented by the following general formula (I): ##STR1## (wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 respectively represent a hydrogen atom, a halogen atom or a monovalent organic group; A denotes a bivalent organic group which is bonded to the ring through a double bond; and X.crclbar. represents an anionic group and is present in a number required to neutralize existing cationic charges, provided that X.crclbar. may form an intramolecular salt together with either of R.sub.1 to R.sub.6 and A or that at least one of the following combinations, R.sub.2 and R.sub.3 ; R.sub.3 and R.sub.4 ; R.sub.4 and R.sub.5 ; R.sub.5 and R.sub.6 may form a substituted or unsubstituted aromatic carbocyclic ring or aromatic heterocyclic ring); and optionally a quencher.

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 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: 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 photoreceptor is disclosed, comprising a conductive support having provided thereon a light-sensitive layer, wherein said light-sensitive layer contains a specific trisazo compound as a charge generating material and at least one of specific charge transporting materials. The photoreceptor exhibits high sensitivity and durability.

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 light-sensitive composition is disclosed, containing at least one of tetrakisazo compounds having the following general formula [1]: ##STR1## wherein Cp represents a coupler residue; A is a single bond, ##STR2## in which n is an integer of from 1 to 3, or a divalent aromatic organic residue, and B.sup.1 and B.sup.2 each represents a hydrogen atom or an electron attractive group; Z represents ##STR3## --O--, --S-- or --Se--, in which R.sup.6 represents a hydrogen atom, a substituted or unsubstituted lower alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxycarbonyl group, a substituted or unsubstituted aryloxycarbonyl group or a substituted or unsubstituted acyl group; and Ar represents a substituted or unsubstituted divalent aromatic carbon ring group, or a substituted or unsubstituted divalent heterocyclic aromatic ring group.

Abstract: Disazo compounds represented by the following general formula (I) are disclosed. The compounds can function as effective photoconductive substances and further, as efficient charge carrier (both electron and positive hole) generating compounds in an electrophotographic photoreceptor: ##STR1## (wherein X represents atoms necessary to form an aromatic ring, such as a naphthalene ring, an anthracene ring, etc., or a netero ring, such as an indole ring, a carbazole ring, a dibenzofuran ring etc., (all of which rings may be either substituted ones or nonsubstituted ones) by combining with the benzene ring to which a hydroxyl group and a group Y are attached; Y represents ##STR2## R.sup.1 represents an alkyl group, a phenyl group or a substituted group thereof; R.sup.2 represents a hydrogen atom, a lower alkyl group, a carbamoyl group, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, or a substituted or a nonsubstituted amino group; R.sup.3 and R.sup.

Abstract: A photoconductive composition is disclosed, containing at least one trisazo compound represented by the following general formula (1): ##STR1## wherein Z represents ##STR2## R.sup.6 represents a hydrogen atom, a lower alkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyl group, or a substituted group of them; As', which may be the same or different, each represents ##STR3## B.sup.1, B.sup.2 and B.sup.3 each represents a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group or a substituted lower alkyl group or lower alkoxy group, and B.sup.1, B.sup.2 and B.sup.3 may be identical or different; X represents an atomic group necessary to form an aromatic ring or heterocyclic ring, which may be substituted or unsubstituted, by condensing with the benzene ring to which the hydroxyl group and Y are bonded; Y represents ##STR4## R.sup.1 represents an alkyl group, a phenyl group or a substituted alkyl or phenyl group; R.sup.

Abstract: The integrated type electrophotographic light-sensitive material is disclosed, the material comprising two layers comprising (1) an electric charge generating layer containing an electric charge generating material and (2) an electric charge transporting layer containing an electric charge transporting material, provided on an electrically conductive base, wherein said electric charge generating layer contains at least one hydrazone compound represented by the following general formulas (I)-(V): ##STR1##

Abstract: A photosensitive composition is provided comprising at least one azo compound represented by formula (1) ##STR1## wherein A.sup.1 represents a substituted or unsubstituted carbocyclic or heterocyclic aromatic ring; X represents an atomic group forming a substituted or unsubstituted carbocyclic or heterocyclic aromatic ring upon condensation with benzene rings; Ar represents a carbocyclic or heterocyclic aromatic ring substituted by at least one perfluoroalkyl group (groups other than perfluoroalkyl group may also be present); and n represents an integer of 3, 4, 5, or 6.