Abstract: An electrophotographic photoreceptor comprising: (1) an electrophotographic photosensitive layer which comprises a charge carrier transporting compound and a charge carrier generating compound, or (2) an electrophotographic photosensitive layer which comprises a charge carrier transporting compound layer and a charge carrier generating compound layer, on an electrically conductive support, wherein said charge carrier generating compound is a bis-azo compound represented by formula (I): ##STR1## wherein, Ar.sup.1, Ar.sup.2, Ar.sup.5 and Ar.sup.6 represent aryl groups, Ar.sup.3 and Ar.sup.4 represent arylene groups, and R.sup.1 represents a hydrogen atom or an SO.sub.3 Na group.

Abstract: Unsymmetrical squaraine compounds such as substituted dialkylaminophenylalkoxyaryl squaraines, and imaging members comprised of the aforementioned squaraines.

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: 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 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: An electrophotoconductor is disclosed, comprising a conductive support having provided thereon a photoconductive layer comprising a resin binder having dispersed therein an anthanthrone compound, a phthalocyanine compound, and an oxadiazole compound. The electrophotoconductor exhibits high sensitivity in the wavelength region of from 760 to 850 nm and high negative charge retention and is suitable for use in a recording device using a semiconductor laser as a light source.

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: An electrophotographic photoreceptor having a photosensitive layer containing a butadiene compound represented by general formula ##STR1## wherein A.sub.1 to A.sub.4 are alkyl group, and a hydrazone compound represented by general formula ##STR2## wherein B.sub.1 and B.sub.2 are alkyl, phenyl, benzyl or methoxyphenyl groups, R.sub.1 is hydrogen, alkyl, alkoxy or benzyloxy groups and R.sub.2 is alkyl, phenyl or benzyl groups. The photoreceptor can suppress the photo-deterioration due to cyclic operation and is useful in the field of copying printers.

Abstract: Novel squaric acid methine dyes are provided. These dyes are useful in forming photoconductive layers for components utilized in electrographic imaging processes.

Abstract: A bisazo compound of the general formula: ##STR1## where Ar is selected from the group consisting of substituents (a).about.(i), ##STR2## a dinitro compound, a diamino compound, and a tetrazonium salt, which respectively serve as a starting material, a first intermediate and a second intermediate for producing the above bisazo compound are prepared, and an electrophotographic photoconductor comprising an electroconductive support having thereon a photoconductive layer containing any of the above bisazo compounds is disclosed.

Abstract: A transparent electrophotographic photoreceptor comprising a conductive support having provided thereon a photosensitive layer is disclosed, wherein said photosensitive layer contains a combination of at least one of specific hydrazone compounds and at least one of specific benzidine compounds as photoconductive substances. These photoconductive substances are prevented from crystallization and precipitation on the surface of the photoreceptor so that the photoreceptor exhibits satisfactory stability before and after image formation even when preserved for long periods of time or under a high temperature condition.

Abstract: In accordance with the present invention there is provided an organic compound having the formula selected from the group consisting of: ##STR1## wherein x is an integer from 0 to 2, y is an integer from 1 to 6, and z is an integer from 0 to 2; ##STR2## wherein L is aliphatic, alicyclic or aromatic and a is an integer from 2 to 6; and wherein G has the formula ##STR3## wherein n is an integer from 0 to 6 and Q.sub.1, Q.sub.2, Q.sub.3, Q.sub.5, Q.sub.6, and Q.sub.7, which may be the same or different, represent H or CH.sub.3, and Q.sub.4 represents H or CH.sub.3 when x and z are 0 or n is greater than 0, or Q.sub.4 represents CH.sub.3 when x or z are 1 or 2 and n is 0.The compounds, which exhibit unexpectedly high T.sub.g and unexpectedly high resistance to oxidation, are useful in electrophotographic elements.

Abstract: A photosensitive member for electrophotography comprising a photosensitive layer containing an azo pigment selected from those represented by the following formulas (1)-(6): ##STR1## wherein R is an alkyl, aralkyl, aryl, or acyl each capable of having a substituent; Ar is an arylene or heterocyclic group each capable of having a substituent; Ar is a coupler residue group having a phenolic OH group; B is hydrogen, nitroso, or an alkyl, aralkyl, aryl or acyl group capable of having a substituent; and n is 0 or 1.

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: Polyimide-electron donor charge transfer complexes, supported or unsupported, as photoconductive elements characterized by photoconductivities in excess of the sum of the individual photoconductivities of the polyimide and electron donor components.

Abstract: The present invention relates to a photosensitive material for use in electrophotography, characterized by having a photosensitive layer containing a disazo pigment having the following general formula (I), ##STR1## wherein A represents a coupler residue.

Abstract: Novel squarylium compounds, a process for the production thereof as well as to a photoreceptor for electrophotography containing the squarylium compound are disclosed, said squarylium compounds being represented by formula (I): ##STR1## wherein R is a straight-chain alkyl group having 2 or more carbon atoms or --C.sub.2 H.sub.4 X, wherein X is a hydroxyl group, a halogen atom or the group --OR.sub.1 wherein R.sub.1 is an alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted phenyl group.

Abstract: The present invention relates to a novel disazo compound having the following general formula (I), ##STR1## wherein A represents ##STR2## (wherein R represents an alkyl, alkoxy, nitro, halogen, cyano or halomethyl group; n represents an integer of 0, 1, 2 or 3; and R may be the same or different when n is an integer of 2 or 3), and a method for preparing the same.The present invention further relates to a photosensitive material for use in electrophotography, characterized by providing a photosensitive layer containing a disazo pigment having the following general formula (VII), ##STR3## wherein A.sub.1 represents a coupler residue and R' represents hydrogen or a lower alkyl group.

Abstract: Disclosed are compounds of the formula ##STR1## wherein n is 1 or 2; R.sup.1 and R.sup.2 are alkyl or aralkyl; R.sup.3 is alkyl; when n is 1, R.sup.4 is alkyl, aralkyl, alkenyl, aralkenyl, aryl or a polyether radical having up to 10 ether groups; and when n is 2, R.sup.4 is alkylene, aralkylene, alkenylene, aralkenylene, arylene or a divalent polyether radical having up to 10 ether groups. The compounds are highly efficacious organic photoconductors for use in electrophotography, exhibiting improved pre-exposure fatigue resistance and blooming properties as compared with known photoconductors. Photoconductive elements containing these compounds are also described.

Abstract: An electrophotographic photosensitive member having a conductive substrate and a photosensitive layer, which is characterized in that the photosensitive layer comprises a binder and at least one hydrazone compound represented by the following general formula (1) or (2): ##STR1## In the formula; R.sub.11 and R.sub.12 independently of each other represent alkyl, aralkyl, or phenyl, each substituted or unsubstituted, or R.sub.11 and R.sub.12 form a 5- or 6-membered ring residue conjointly with the nitrogen atom to which they are bonded; R.sub.13 and R.sub.14 independently of each other represent alkyl or alkoxy; R.sub.15 and R.sub.16 independently of each other represent alkyl, aralkyl, or aryl, wherein the aralkyl and the aryl are substituted or unsubstituted; and n represents a integer of 0 or 1. ##STR2## In the formula; R.sub.21 and R.sub.22 independently of each other represent alkyl, aralkyl, or phenyl, each substituted or unsubstituted, or R.sub.21 and R.sub.

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: Photoconductive films contain specified azulenium salt compounds. Electrophotographic photosensitive members are provided with a photoconductive film containing at least one of the specified azulenium salt compounds.

Abstract: Disclosed are unsymmetrical squaraine compounds of the following formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently selected from the group consisting of alkyl, aryl heterocyclic, benzyl, and halobenzyl; and X.sub.1, X.sub.2 and X.sub.3 are independently selected from the group consisting of hydrogen, alkyl, halogen, carboxy, and hydroxy; and photoresponsive imaging members having incorporated therein the aforementioned squaraine compounds.

Abstract: An electrophotographic light-sensitive material comprising a charge transporting compound and a styryl dye represented by formula (I) ##STR1## wherein A represents N--R.sub.8, O, S, Se, or ##STR2## R.sub.1 and R.sub.2 each represents a hydrogen atom or a substituent having a Hammett's substituent constant, .delta., of 0.2 or more;R.sub.3, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 each represents a hydrogen atom, an alkyl group or a substituted alkyl group containing from 1 to 5 carbon atoms in the alkyl moiety;R.sub.4 and R.sub.5 each represents a hydrogen atom, an alkyl group, a substituted alkyl group, an aryl group, or a substituted aryl group;X.sup..crclbar. represents an anion; andn represents an integer of 1 or 2.

Abstract: Disclosed are fluorinated squaraine compounds of the following formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are independently selected from the group consisting of alkyl, aryl, and heterocyclic substituents.

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.

Abstract: An improved process for the preparation of mixed squaraine compositions which comprises reacting squaric acid, an aromatic amine, and a fluoroaniline, in the presence of an aliphatic alcohol, and an optional azeotropic substance.

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: Styryl derivatives of the formula ##STR1## an electrophotographic photoconductor comprising an electroconductive support material and a photosensitive layer comprising at least one styryl derivative of the same formula are disclosed, in which R.sup.1 is selected from the group consisting of an alkyl group, a substituted alkyl group, an aryl group and substituted aryl group; R.sup.2 is selected from the group consisting of hydrogen, an alkyl group, a substituted alkyl group, an aryl group and a substituted aryl group; and Ar represents an aryl group or a substituted aryl group.

Abstract: An unsymmetrical squaraine composition, process for synthesizing the unsymmetrical squaraine composition, devices containing the unsymmetrical squaraine composition, and methods of using the devices. The process for synthesizing the unsymmetrical squaraine composition comprises forming a mixture comprising squaric acid, a long chain primary alcohol, a first tertiary amine, and a second tertiary aromatic amine different from the first tertiary aromatic amine, and heating the mixture in vacuo below the boiling points of the primary alcohol, the first tertiary amine and the second tertiary aromatic amine to form an unsymmetrical squaraine composition. The novel unsymmetrical squaraine composition synthesized by this process may be used in electrostatographic imaging members comprising a supporting substrate and a photoconductive layer comprising the novel unsymmetrical squaraine composition. These electrostatographic imaging members may be utilized in an electrostatographic imaging processes.

Abstract: Styrene derivatives of the formula ##STR1## and an electrophotographic photoconductor comprising an electroconductive support material and a photosensitive layer comprising at least one styrene derivatives of the same formula are disclosed, in which Ar represents an unsubstituted of substituted phenyl group or an unsubstituted or substituted styryl group, R represents hydrogen, a lower alkyl group or an unsubstituted or substituted phenyl group, and A is selected from the group consisting of ##STR2## wherein R.sup.1 represents a lower alkyl group or a lower alkoxy group, R.sup.2 and R.sup.3 each represent a lower alkyl group, an aralkyl group, or an unsubstituted or substituted phenyl group.

Abstract: An electrophotographic light-sensitive material is described, comprising, provided on an electrically conductive support, a light-sensitive layer containing at least one hydrazone compound selected from particular groups of hydrazone compounds.

Abstract: An electrophotographic photoreceptor which has an electrophotographic photoreceptive layer containing as a charge generating material a particular organic compound having the general formula described hereinafter in this disclosure in a combination with a charge transporting material. The compounds improve upon the sensitivity, durability and selectivity to photosensitive wavelengths of photoreceptors. Furthermore, the photoreceptors can be easily manufactured.

Abstract: A photoconductive film comprises an azulenium salt represented by the general formula (1) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, and R.sub.7 are each independently hydrogen, halo or a monovalent organic residue; or at least one of the combinations of R.sub.1 with R.sub.2, R.sub.3 with R.sub.4, R.sub.4 with R.sub.5, R.sub.5 with R.sub.6, and R.sub.6 with R.sub.7 may form an unsubstituted or substituted aromatic ring; R.sub.8 and R.sub.9 are each independently unsubstituted or substituted alkyl, aryl, or aralkyl; or R.sub.8 and R.sub.9, together with the nitrogen atom to which they are attached, may be joined to form an aromatic ring; R.sub.10, R.sub.11, R.sub.12, and R.sub.13 are each independently hydrogen, halo, alkyl, alkoxy, or hydroxyl; and n is 0, 1, or 2.

Abstract: Photoconductive materials for electrophotography which have high sensitivity and high durability are provided by incorporating at least one hydrazone compound represented by the following general formula (I) in photoconductive layer: ##STR1## (wherein M is 0, 1, 2 or 3 and l is 1 or 2), R.sub.2 is a hydrogen atom, a lower alkyl group, a lower alkoxy group or a halogen atom,R.sub.3 is a hydrogen atom, a lower alkyl group or an aryl group,R.sub.4 is a hydrogen atom, a lower alkyl group, a lower alkoxy group or a halogen atom,R.sub.5 is an allyl group, propenyl group or ##STR2## (wherein R.sub.6 is a lower alkyl group, a lower alkoxy group or a halogen atom), and n is 0 or 1.

Abstract: An improved process for the preparation of mixed squaraine compositions which comprises reacting squaric acid, an aromatic amine, and a fluoroaniline, in the presence of an aliphatic alcohol, and an optional azeotropic substance.

Abstract: Photoresponsive devices, including layered photoresponsive devices comprised of a photoconductive layer of squaraine compositions of the following formula: ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from the group consisting of alkyl substitutents and aryl substituents.

Abstract: An electrophotographic photosensitive member characterized by containing at least one azo pigment represented by the following formula (1), (2), or (3): ##STR1## In these formulae; ##STR2## wherein Z represents ##STR3## in which R.sub.71 is hydrogen, or substituted or unsubstituted alkyl; n is 0 or 1; R.sub.21, R.sub.22, R.sub.61 and R.sub.62 represent hydrogen, alkyl, alkoxy, nitro, or hydroxyl R.sub.31 and R.sub.32 represent hydrogen or alkoxy; and R.sub.41, R.sub.42, R.sub.43, R.sub.44, R.sub.51, R.sub.52, R.sub.53 and R.sub.54 represent hydrogen, halogen, or organic monovalent residue. ##STR4## wherein X represents a residue necessary for completing an aromatic hydrocarbon ring or a heterocyclic ring, each ring being substituted or unsubstituted; R.sub.11 represents hydrogen or alkyl; R.sub.12 represents methyl, ethyl or C.sub.3 -C.sub.8 linear alkyl; and R.sub.17 and R.sub.18 represent alkyl, aralkyl or aryl, each substituted or unsubstituted. In formula (2), R.sub.11, R.sub.

Abstract: A multi-layered electrophotographic element providing significantly improved properties, and especially so for use as a "permanent" master in transfer photocopying, comprises a conductive support carrying a photoconductive charge generating layer and on top of the photoconductive layer a charge transporting layer containing homogeneously distributed in an insulating binder a charge transporting agent selected from among certain azines which may comprise one or more alkylsubstituents and/or heterocyclic groups with at least one nitrogen atom and/or phenyl or naphthyl groups. The charge transporting layer may also contain to advantage an activator for the charge transporting agent. Particularly effective activators are terephthalal dimalonitrile (TDM) and 1,3,7- trinitro-dibenzothiophene-5,5-dioxide (DBTO). The charge transporting layer preferably is applied to a very thin charge generating layer formed on an endless support, and which contains the charge generating compound in molecularly divided form.

Abstract: Photoreceptor for electrophotography comprising a conductive support and an overlaying photosensitive layer thereon, said photosensitive layer containing at least one azo compound of Formula I or II ##STR1## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3 and Ar.sub.4 each is an aromatic hydrocarbon ring radical or an aromatic heterocyclic ring radical; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each is an electron attractive group or hydrogen provided that at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is an electron attractive group; and A is ##STR2## wherein X is a hydroxy group or a group represented by the formula: ##STR3## wherein R.sub.6 and R.sub.7 each is hydrogen or an alkyl group, and R.sub.8 is an alkyl or aryl group; Y is halogen, an alkyl or alkoxy group, a carboxy group, a sulfo group, a carbamoyl or sulfamoyl group; Z is an atomic group necessary for making an aromatic hydrocarbon ring or an aromatic heterocyclic ring; R.sub.

Abstract: Stilbene derivatives of the formula (I) ##STR1## and distyryl derivatives of the formula (II), ##STR2## as defined in the specification, and an electrophotographic photoconductor comprising an electroconductive support material and a photosensitive layer overlayed thereon comprising at least one of the above derivatives, are disclosed.

Abstract: Disclosed are the use of novel squaraine compositions selected from the group consisting of bis(2-fluoro-4-methylbenzylaminophenyl)squaraine, bis(2-fluoro-4-methyl-p-chlorobenzylaminophenyl)squaraine, bis(2-fluoro-4-methyl-p-fluorobenzylphenyl)squaraine, and bis(2-fluoro-4-methyl-m-chlorobenzylaminophenyl)squaraine, in photoresponsive devices, particularly layered photoresponsive devices which are sensitive to infrared and/or visible illumination.

Abstract: An electrophotographic photosensitive member comprises an electrically conductive substrate and a layer containing a hydrazone compound represented by the following formula (1) and a binder: ##STR1## wherein; R.sub.1 and R.sub.2 each represent alkyl, aralkyl, or aryl, substituted or unsubstituted, or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached form a 5- or 6-membered ring; R.sub.3 represents halogen or fluoroalkyl; R.sub.4 and R.sub.6 each represent hydrogen or halogen; R.sub.5 represents hydrogen, alkyl, alkoxyl, or halogen; each of R.sub.7 and R.sub.8 represents alkyl, aralkyl, or aryl, substituted or unsubstituted; and n represents an integer of 0 or 1.

Abstract: An electrophotographic imaging process having a double charging sequence and a photoreceptor utilized therein are provided, wherein the photoreceptor comprises a substrate, a photosensitive layer comprising a squaric acid methine dye, and an insulating layer. The photosensitive layer may also comprise a squaric acid methine dye and a charge transport material.

Abstract: Photoconductive compositions and elements comprising arylalkane photoconductors and pyrylium sensitizers are stabilized against adverse leuco base color shifts into the ultraviolet to blue spectral region by the incorporation of certain 1,4,5,8-naphthalene bis-dicarboximide compounds. The compositions and elements are particularly suited for electrophotographic image formation and thereafter for contact printing of the image onto sensitive material by ultraviolet or blue transmission through the composition or element.

Abstract: The invention disclosed relates to a photosensitive member having excellent photosensitivity characteristics in the visible light region as well as in the near infrared region. The photosensitive member according to the invention comprises an electrically-conductive substrate, an amorphous silicon semiconductor layer, an amorphous silicon-germanium photoconductive layer formed on the semiconductor layer, and an amorphous silicon photoconductive layer formed the amorphous silicon-germanium photoconductive layer.

Abstract: An electrophotographic photosensitive member comprises a layer containing at least one azo pigment represented by the following formula (I): ##STR1## in the formula, Cp represents a coupler residue; A.sub.1 and A.sub.2 each represent a divalent organic residue; n represents 0 or 1; and when n is 0, A.sub.3 represents substituted or unsubstituted alkyl, substituted or unsubstituted aryl, or --(CH.dbd.CH).sub.l --R', wherein R' is a substituted or unsubstituted heterocyclic ring residue an l is 0, 1 or 2, and when n is 1, A.sub.3 represents a divalent organic residue.

Abstract: There is disclosed an electrophotosensitive receptor which comprises a conductive support and an electrophotosensitive layer which comprises a carrier transporting material and a specified trisazo compound wherein the azo compound is applied as a coating solution containing a solvent or as a liquid dispersion mixture containing a dispersion medium. Alternatively, the electrophotosensitive receptor comprises a conductive support and an electrophotosensitive layer which comprises said azo compound wherein the azo compound is applied as a coating solution containing a solvent and a binder or as a liquid dispersion medium containing a dispersion medium and a binder.

Abstract: An electrophotographic photosensitive member is characterized by having a layer containing at least one of hydrazone group compounds represented by the following formula (1) or of ketazine group compounds represented by the following formula (2): ##STR1## In the formula, R.sub.11 and R.sub.12 independently of one another represent hydrogen, substituted or unsubstituted aryl, or substituted or unsubstituted heterocyclic radical; R.sub.13 and R.sub.14 independently of one another represent subsituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, substituted or unsubstituted aryl, or substituted or unsubstituted heterocyclic radical; and R.sub.15 represents a divalent organic residue. ##STR2## In the formula, R.sub.21, R.sub.22, R.sub.23, and R.sub.24 independently one another represent substituted or unsubstituted alkyl, substituted or substituted aralkyl, or substituted or unsubstituted aryl, or R.sub.21 and R.sub.

Abstract: A triphenylmethane polymer, a process for production thereof, and photoconductive compositions and a member containing the polymer are described; the polymer is represented by formula (I) ##STR1## wherein R is an alkyl group, X is H or a methyl group, Z is an alkylene group or a p-xylylene group, Y is H, a methyl group, a methoxy group, a tertiary amino group, halogen, a nitro group or a cyano group, Q is H or a methyl group, and n represents a polymerization degree sufficient to obtain the intrinsic viscosity [.eta.] of the polymer from 0.005 to 1.000.