Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer which is formed on the support and contains as an effective component an aromatic polycarbonate resin having a structural unit of formula (I), or the structural unit of formula (I) and a structural unit of formula (II): ##STR1## wherein Ar.sup.1 to Ar.sup.5, R.sup.1, and X are as specified in the specification.

Abstract: An organic photoreceptor that includes:(a) a charge transport compound having the formula ##STR1## where n is an integer between 2 and 6, inclusive; R.sup.1 and R.sup.2, independently, are an alkyl group, a cycloalkyl group, or an aryl group, or R.sup.1 and R.sup.2 combine with the nitrogen atom to form a ring;Y is a bond, a carbon atom, a --CR.sup.3 group, an aryl group, a cycloalkyl group, or a cyclosiloxyl group;R.sup.3 is hydrogen, an alkyl group, or an aryl group; andX is a linking group having the formula --(CH.sub.2).sub.m -- where m is an integer between 4 and 10, inclusive, and one or more of the methylene groups is optionally replaced by an oxygen atom, a carbonyl group, or an ester group;(b) a charge generating compound; and(c) an electroconductive substrate.

Abstract: A nitro group-containing naphthoquinone derivative represented by the following general formula: ##STR1## wherein R is a monovalent hydrocarbon group having a nitro group, and a ring A may be substituted with a substituent.This compound is a novel substance and is useful as an electron-transporting agent for an electrophotosensitive material. The electrophotosensitive material using the electron-transporting agent is highly sensitive, exhibits favorable repetitive properties, and makes it possible to favorably form images for extended periods of time.

Abstract: Disclosed is a photoconductive solution which has excellent charge characteristics with easy control of charge amount and is completely volatilized after baking. The solution contains 2 to 5% by weight of tetracyanoethylene as ultraviolet-sensitive material. 0.1 to 1 wt. % diphenylpicrylhydrazine and tetracyanoquinodimethane below 0.1% by weight are desirably added to the tetracyanoethylene of 2 to 5 wt. % for better accomplishment of the purpose, and the solution contains at least one of trinitrofluorenone, ethylanthraquinone and their mixture of 0.1 to 1 wt. % as an acceptor. The solution is formed by mixing the above ingredients together with 10 to 20 wt. % of at least one of polystyrene, polymethyl methacrylate, polyalphamethylstyrene and polystyrene-oxazoline copolymer, and 20 to 85 wt. % of toluene as solvent.

Abstract: An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a structural unit of formula (I), or in combination with a structural unit of formula (II): ##STR1## wherein R, R.sup.1, and X are as specified in the specification.

Abstract: An electrophotographic photoreceptor having a photosensitive layer containing a charge-generating material and a charge-transporting material on an electroconductive substrate, wherein the charge-transporting material has a butadiene structure and a total amount W of .pi. electron number and lone electron number of nitrogen of the charge-transporting material is at least 60.

Abstract: An electrophotographic photoconductor including a photoconductive layer which is formed overlying an electroconductive substrate and which includes at least a charge transporting polymer material, wherein the photoconductive layer has a water vapor permeability not greater than about 200 g.multidot.m.sup.-2 .multidot.24 h.sup.-1. The photoconductive layer may be a functionally separated photoconductive layer including a charge generating layer and a charge transporting layer which is formed overlying the charge generating layer and which includes the charge transporting polymer material, wherein the charge transporting layer has a water vapor permeability not greater than about 200 g.multidot.m.sup.2 .multidot.24 h.sup.-1.

Abstract: The invention seeks to provide an electrophotographic apparatus, which can have a simplified and safe construction in an image forming apparatus using an a-Si photo-sensitive drum and form clear images free from the flow of image or "fog". The image forming apparatus that is sought uses image development a non-magnetic uni-component toner prepared by a polymerization process as a preamble, and is characterized in that a developing roller is rotated in contact with an a-Si photo-sensitive drum via a layer of non-magnetic uni-component toner. The volume resistivity of the developing roller is set to 3.times.10.sup.7..OMEGA. cm or below. The photo-sensitive drum has a surface layer with an element ratio composition represented as (a-Si.sub.1-x C.sub.x :H), x being 0.95.ltoreq.x<1, the dynamic push hardness of the outer surface of the surface layer being 300 kgf/mm.sup.

Abstract: A photoconductive element comprising an electrically conductive support and at least one active layer, said active layer comprising N-(p-(di-p-tolylamino)phenyl)-N'-(1,2-dimethylpropyl)-1,4,5,8-naphthalenet etracarboxylic diimide and one or more perylene dyes of structure I: ##STR1## wherein R.sub.1 and R.sub.2 are, each independently, ##STR2## and 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 are, each independently, H, CH.sub.3, or C.sub.2 -C.sub.4 alkyl, linear or branched.

Abstract: A nitro group-containing naphthoquinone derivative represented by the following general formula: ##STR1## wherein R is a monovalent hydrocarbon group having a nitro group, and a ring A may be substituted with a substituent.This compound is a novel substance and is useful as an electron-transporting agent for an electrophotosensitive material. The electrophotosensitive material using the electron-transporting agent is highly sensitive, exhibits favorable repetitive properties, and makes it possible to favorably form images for extended periods of time.

Abstract: A photoreceptor for electrophotography of the present invention includes a photosensitive layer provided on a conductive support, the photosensitive layer containing a bishydrazone compound represented by the following general formula (Ia): ##STR1## where: R.sup.1 and R.sup.2 each represent a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, a heterocyclic group, or an alkyl group which has 1 to 4 carbon atoms;"a" represents an alkyl group which has 1 to 3 carbon atoms, an alkoxy group which has 1 to 3 carbon atoms, a dialkylamino group which has 1 to 3 carbon atoms, a halogen atom, or a hydrogen atom; andn represents an integer of 1 to 3, wherein, if n is 2 or greater, a plurality of "a" substituents may be identical to or different from one another, or the substituents may form a ring.

Abstract: The present invention provides an electrophotosensitive material comprising a photosensitive layer containing a m-phenylenediamine compound represented by the general formula (1): ##STR1## wherein R.sup.1A and R.sup.1B are the same or different and indicate an alkyl group; and R.sup.1C, R.sup.1D, R.sup.1E and R.sup.1F are the same or different and indicate a hydrogen atom or an alkyl group, which has high sensitivity and issuperior in stability to strong light, durability and heat resistance, and an image forming method capable of realizing more higher speed and more larger energy saving than the prior art.

Abstract: A photoconductor for use in electrophotographic reproduction devices is disclosed. This photoconductor exhibits reduced room light and cycling fatigue without any corresponding negative impact on the sensitivity of the photoconductor. The photoconductor of the present invention includes specifically defined fluorenyl-azine derivatives in its charge transport layer. These materials have the formula: ##STR1## wherein R.sub.1 and R.sub.2 independently selected from C.sub.1 -C.sub.4 alkyl and phenyl, and R.sub.3 is selected from hydrogen, C.sub.1 -C.sub.4 alkyl, and phenyl.

Abstract: The present invention provides a naphthoquinone derivative represented by the general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are as defined in the specification. An electrophotosensitive material containing this naphthoquinone derivative as an electron transferring material has high sensitivity.

Abstract: A triphenylamine derivative, represented by the following general formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 each represents a hydrogen atom, a lower alkyl group, an alkoxy group, a halogen atom or an aryl group which may have a substituent group; and m and n each represents 0 or 1.

Abstract: A photoconductive composition and a display device adopting a photoconductive layer formed of the composition. The photoconductive composition includes an electron donor, an electron acceptor, a charge transmitting substance, a binder, a surfactant and a solvent, and the photoconductive composition is characterized in that a 1,4-diphenyl-1-butene-3-yne derivative is used as the electron donor. The photoconductive composition has excellent sensitivity and thermal decomposition property. Thus, there are scarcely residues left after the sintering process, thereby effectively preventing deterioration in image quality of a display device.

Abstract: The present invention provides a novel naphthoquinone derivative preferred as an electron transporting agent and an electrophotographic photosensitive material of high sensitivity which contains a novel naphtoquinone derivative having a general formula (1) ##STR1## wherein R.sup.1 represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group which may contain a substituent, and R.sup.2 represents a hydrogen atom, an alkyl group which may have a substituent, a halogenated alkyl group, an aldehyde or a nitro group. The derivative is contained in a photosensitive layer of an electrophotographic photosensitive material as an electron transporting agent.

Abstract: An electrophotographic photoconductor comprises:(a) a conductive substrate; and(b) a photoconductive film on said conductive substrate, with the photoconductive film comprising at least one charge generation agent, at least one charge transport agent, and at least one furan derivative or thiophene derivative, the furan or thiophene derivative having the general formula: ##STR1## or ##STR2##

Abstract: A conductive circuit board is prepared by forming a film of organopolysilane having a H-Si bond on a substrate, selectively exposing the organopolysilane film to light to form a photo-crosslinked layer in exposed areas, dissolving away unexposed areas, and contacting a silver salt with the photo-crosslinked layer and reducing the silver salt to form a silver conductive layer thereon. A conductive circuit board comprising a circuit-patterned film of photo-crosslinked polymer on a substrate and a silver conductive layer on the film has high and stable electric property.

Abstract: A photoconductive element containing a transport substance and an azine, wherein the azine is a transport substance having the molecular formula: ##STR1## wherein R.sub.1 -R.sub.6 can be different or the same constituents, and are hydrogen or C.sub.1 -C.sub.4 alkyl groups. The transport substance is preferably a tri-aryl amine or a substituted stilbene compound. These photoconductive elements reduce the deterioration of the photoelectrical properties.

Abstract: An electrophotographic photoconductor having an electrically conductive substrate and a photosensitive layer formed on the conductive substrate is provided wherein the photosensitive layer comprises a layer that contains titanyl oxyphthalocyanine as a photoconductive material, and alkyl polyol that is diol or higher polyol and has hydroxyl groups for every three carbon atoms in a main chain of the alkyl polyol. The content of the alkyl polyol is controlled such that the amount of the hydroxyl groups of the alkyl polyol is in a range of 0.1 mol to 100 mol per 1 mol of titanyl oxyphthalocyanine. A method of manufacturing this electrophotographic photoconductor is also disclosed.

Abstract: An electrophotographic photoconductor includes a conductive substrate having a photoconductive film thereon. The photoconductive film includes a layer containing a charge transport agent and a phosphonite compound, which acts as an antioxidant. Preferably, the phosphonite compound is diarylarylphosphonite. The layer that contains the charge transport preferably contains from 0.005 to 10 weight % of diarylarylphosphonite. The diarylarylphosphonite is preferably a compound selected from the group consisting of bis(2,4-di-tert-butylphenyl)phenylphosphonite, bis(2,6-di-tert-butylphenyl)phenylphosphonite and bis(2,6-di-tert-butyl-4-methylphenyl)phenylphosphonite.

Abstract: An electrophotographic photoconductor has an electroconductive support and a photoconductive layer provided thereon, containing at least one phenol compound of formula (1): ##STR1## wherein R.sup.1 to R.sup.4 and R.sup.11 to R.sup.14 are each independently a hydrogen atom, an alkyl group which may have a substituent, an alkoxyl group which may have a substituent, an alkoxycarbonyl group which may have a substituent, an aryl group which may have a substituent, nitro group, cyano group or a halogen atom; and Y is ##STR2## in which R is a hydrogen atom, an alkyl group which may have a substituent, an alkoxyl group which may have a substituent, an alkoxycarbonyl group which may have a substituent, an aryl group which may have a substituent, nitro group, cyano group, hydroxyl group or a halogen atom, and n is an integer of 0 to 5, or --(CH.dbd.CH).sub.x --, in which x is an integer of 0 to 5.

Abstract: A photosensitive body comprises a conductive substrate; a photosensitive layer on the conductive substrate, the photosensitive layer includes a charge transport compound wherein the charge transport compound is described by a general formula (I): ##STR1## wherein A is a phenyl or naphthyl group; each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is a hydrogen atom, a halogen atom, an alkyl group with or without substitution, an alkoxy group, an alkylamino group, a nitro group, a cyano group, an aryl group with or without substitution, or a heterocyclic group with or without substitution; and each of R.sup.5 and R.sup.6 is a cyano group or an alkoxycarbonyl group.

Abstract: An electrophotographic photosensitive member is constituted by a support and a photosensitive layer disposed on the support. The photosensitive layer includes a fluorene compound represented by a formula (1) and a stilbene compound represented by a formula (4). The compounds of the formulas (1) and and (4) may preferably be used as a charge transport material. The combination of such compounds is effective in improving resistances to abrasion, crack and crystallization of the resultant photosensitive layer.

Abstract: An electrophotographic photoreceptor having a photosensitive layer containing a charge generation material and a charge transport material on an electroconductive substrate, wherein the charge transport material has a polarizability .alpha. of the formula, .alpha.>100 (.ANG..sup.3) and a dipole moment P of the formula, P<1.6 (D).

Abstract: An electrophotographic photoreceptor is disclosed. The photosensitive layer of the photoreceptor comprises a compound represented by formula (A), ##STR1## wherein R.sub.1 represents a group represented by formula (B), and R.sub.2 represents a group represented by formula (B), a hydrogen atom or an alkyl group having from 1 to 9 carbon atoms, ##STR2## wherein formula R represents an alkyl group having from 1 to 9 carbon atoms.

Abstract: An electrophotographic photoconductor contains at least a furan derivate or a thiophene derivate as the charge transport agent in a photoconductive layer thereof.

Abstract: An electrophotographic photoreceptor comprising a charge transporting material containing at least one triphenylamine compound represented by general formula (1) and at least one compound selected from the group consisting of a hydrazone compound, a triphenylamine dimer compound and a distyryl compound: ##STR1## said charge transporting material being able to express high carrier mobility, being high in solubility in a binder polymer, and being able to form a homogeneous charge transporting layer.

Abstract: An electrophotographic photoconductor has a conductive substrate and a photosensitive layer. The photosensitive layer is laminated on the conductive substrate and includes at least phthalocyanine compound as a photoconductive material. In the photosensitive layer, the content of o-phthalonitrile polymer except the phthalocyanine compound is in a range of 100 nmol to 200 mmol with respect to 1 mol of the phthalocyanine compound. Thus, the electrophotographic photoconductor has an excellent surface-charge retention.

Abstract: An electrophotographic photoreceptor in which the surface of a photosensitive layer has a small friction coefficient without impairing the excellent electrophotographic characteristics and which has an enhanced oil resistance and does not cause light fatigue, the electrophotographic photoreceptor comprising an electroconductive support having formed thereon a photosensitive layer comprising at least a charge-generating agent, a charge-transfer agent and a binder resin, wherein the photosensitive layer contains a polycarbonate copolymer comprising a recurring unit represented by the general formula (I) as the binder resin: ##STR1## and a butadiene compound represented by the general formula (IV) as the charge-transfer agent: ##STR2##

Abstract: Disclosed is an imaging member which comprises a conductive substrate, a photogenerating material, a charge transport material, and a polymeric binder comprising (a) a first polymer comprising a polycarbonate, and (b) a second polymer of the formulae I, II, III, IV, V, VI, VII, VIII, IX, or X as further defined herein.

Abstract: A titanyloxyphthalocyanine crystal to be used as a charge generation material for an electrophotographic photoreceptor, having a maximum diffraction intensity observed at Bragg angle (2 .theta.) of 9.6.degree..+-.0.2.degree. and clear peaks of diffraction intensity observed at 7.22.degree..+-.0.2.degree., 9.60.degree..+-.0.2.degree., 11.60.degree..+-.0.2.degree., 13.40.degree..+-.0.2.degree., 14.88.degree..+-.0.2.degree.,18.34.degree..+-.0.2.degree., 23.62.degree..+-.0.2.degree., 24.14.degree..+-.0.2.degree., and 27.32.degree..+-.0.2.degree., respectively, in an X-ray diffraction spectrum obtained by performing an x-ray diffraction method using CuK.alpha. as a source of radiation. A method for preparing the crystal includes dispersing a predetermined amount of amorphous titanyloxyphthalocyanine in an aqueous solution in which ionic substances are dissolved, under mechanical force at a temperature of under 50.degree. C.

Abstract: An electrophotographic imaging member comprisinga supporting substrate,an undercoat layer doped with an donor moleculea charge generating layer comprisingphotoconductive pigment particles,film forming binder andan donor molecule dissolved in the film forming binder, anda charge transport layer,the charge generating layer being located between the substrate and the charge transport layer. A process for fabricating this imaging member is also disclosed.

Abstract: The present invention provides a naphthoquinone derivative represented by the general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are as defined in the specification. An electrophotosensitive material containing this naphthoquinone derivative as an electron transferring material has high sensitivity.

Abstract: Disclosed is an electrophotographic photoreceptor comprising an electrically conductive support and thereon formed a light-sensitive layer containing a carrier generation material, a carrier transport material and a binder resin, wherein said light-sensitive layer comprises a copolymer having a structural unit represented by Formula B.sub.1 and Formula B.sub.2 ; ##STR1## wherein R.sub.1 and R.sub.2 independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aryl group, R.sub.1 and R.sub.2 may combine together to form a cyclic hydrocarbon residue having 4 to 10 carbon atoms, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cyclic hydrocarbon residue having 4 to 10 carbon atoms, or an aryl group, l, m, p and q independently represent an integer of 1 to 4. The electrophotographic photoreceptor has high sensitivity and high durability.

Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon containing a polycarbonate resin with a triarylamine structure on the main chain and/or side chain thereof, which serves as a high-molecular weight charge transport material, and at least as a charge generation material an azo compound of formula (1) or (2) specified in the specification.

Abstract: An electrophotosensitive material of the present invention is formed by providing a photosensitive layer containing a bis-azo pigment expressed in formula (1): ##STR1## wherein A.sup.1, A.sup.2, R.sup.1 and n are as defined, as a charge generating material, and a diamine compound expressed in formula (2): ##STR2## wherein R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 p and q k, l, m and o are as defined, as a charge-trasferring material, on a conductive substrate. As a charge generating material, a perylene pigment, anthanthrone pigment, X-type metal-free phthalocyanine pigment, imidazoleperylene pigment or perylene bis-azo pigment are preferable used together with the bis-azo pigment. Thus, photosensitive material is excellent in sensitivity and durability.

Abstract: An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a repeat unit of formula (I), or two repeat units of formulae (II) and (III): ##STR1## wherein Ar.sup.1 to Ar.sup.6, X, n, k and j are as specified in the specification.

Abstract: A photosensitive material for electrophotography, wherein the charge-generating agent comprises a P-type charge-generating pigment and an N-type charge-generating pigment in combination, at least part of these pigments being present in the form of aggregates in the photosensitive layer. The photosensitive material will assume the form of either a single dispersion type or a laminated layer type, and exhibits very high carrier generation efficiency, strikingly improved sensitivity on the side of long wavelengths, excellent balance in the spectral sensitivity and property after repetitively used, and can hence be effectively used for forming image by the electrophotography.

Abstract: An electrophotographic photoreceptor comprising a charge transport material and an anti-oxidant in the charge transport layer is disclosed. The transport material has a carbon atom of which the charge density on aforesaid carbon atom in an aromatic ring is smaller than -0.16 when aforesaid charge transport material is in a positive hole state due to being one electron-oxidation, and the anti-oxidant has oxidation potential (V) satisfying Formula,0.1(V).ltoreq.E.sub.OX -E.sub.T .ltoreq.1.0(V)wherein E.sub.OX is oxidation potential of the anti-oxidant, and E.sub.T is oxidation potential of the charge transport material. The thickness of the charge transport layer is 25 .mu.m or more.

Abstract: An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a repeat unit of formula (I), or two repeat units of formulae (II) and (III): ##STR1## wherein Ar.sup.1 to Ar.sup.6, X, n, k and j are as specified in the specification.

Abstract: The present invention provides an electrophotosensitive material comprising a conductive substrate and a photosensitive layer provided on the conductive substrate, the photosensitive layer comprising a specific hole transferring material and/or electron transferring material and a binding resin of a polyester resin which is a substantially linear polymer obtained by using a specific dihydroxy compound represented by the general formula (1): ##STR1## wherein R.sup.1 is an alkylene group having 2 to 4 carbon atoms; and R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same or different and indicate a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group or an aralkyl group or the like. This photosensitive material is improved in sensitivity, and is also superior in adhesion to conductive substrate as well as mechanical strength such as wear resistance, etc.

Abstract: The present invention provides a tryptoanthrinimine derivative represented by the general formula (Y): ##STR1## wherein R.sup.A to R.sup.M are as defined. Such a derivative of the general formula (Y) is superior in electron transferring capability. Accordingly, an electrophotosensitive material comprising a photosensitive layer containing this derivative (Y) is superior in sensitivity.

Abstract: An electrophotographic photosensitive member comprising a substrate and a photosensitive layer formed thereon, and the photosensitive layer contains an arylamine compound expressed by the following general formula (1): ##STR1## wherein R.sub.l is substituted or unsubstituted alkyl, aralkyl, alkaryl or aryl, R.sub.2 -R.sub.8 are each hydrogen, halogen, substituted or unsubstituted alkyl, alkoxy or amino, and Ar is alkyl, aryl or heterocyclic aryl.An electrophotographic apparatus includes the electrophotographic photosensitive member set forth above, a charging means, an exposure means, and a developing means.

Abstract: In the invention, there is provided an electrophotographic photoreceptor comprising a conductive substrate and a photosensitive layer formed thereon, said photosensitive layer containing an arylamine hydrazone compound represented by the following formula ?I!.

Abstract: A photo-conductive composition and CRT bulb having a photo-conductive layer formed of the same are provided. The photo-conductive composition comprises 5-15 wt % of a charge transmitting substance, represented by the structural formula (1); ##STR1## where R.sub.1 is selected from the group consisting of a phenyl group substituted by one to three substituents selected from the group consisting of amino, dialkylamino, C.sub.1 -C.sub.6 alkoxy, C.sub.1 -C.sub.6 alkyl and cyano groups; 9-alkyl carbazole group; naphthyl group, and R.sub.2 and R.sub.3 are same or different independently from each other, each being selected from the group consisting of hydrogen and C.sub.1 -C.sub.6 alkyl, phenyl and naphthyl groups, and n is between 0 and 2; 1-15 wt % of a charge generating substance which absorbs light in the wavelength range of an ultraviolet region; 70-94 wt % of a binder; and 0.05-1 wt % of a surfactant.

Abstract: An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon, containing a novel aromatic polycarbonate resin having a repeat unit of formula (I): ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 each is an alkyl group which may have a substituent, or a halogen atom; R.sup.4 is a hydrogen atom, or an alkyl group which may have a substituent; Ar.sup.1 and Ar.sup.2 each is an aromatic hydrocarbon group which may have a substituent; l, m and n each is an integer of 0 to 4; k is an integer of 5 to 5,000; and X is a bivalent aliphatic group, a bivalent cyclic aliphatic group, or ##STR2## in which R.sup.5 and R.sup.6 each is an alkyl group which may have a substituent, a halogen atom, or an aromatic hydrocarbon group; p and q each is an integer of 0 to 4; and r is 0 or 1, and when r is 1, Y is a straight-chain, branched or cyclic alkylene group having 1 to 12 carbon atoms, --O--, --S--, --SO--, --SO.sub.2 --, or --C(O)--.

Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer including a charge generation material and a charge transport material. The charge generation material is a titanyloxyphthalocyanine crystal having a maximum diffraction intensity observed at Bragg angle (2.theta.) of 9.6.degree..+-.0.2.degree. and clear peaks of diffraction intensity observed at 7.22.degree..+-.0.2.degree., 9.60.degree..+-.0.2.degree., 11.60.degree..+-.0.2.degree., 13.40.degree..+-.0.2.degree., 14.88.degree..+-.0.2.degree., 18.34.degree..+-.0.2.degree., 23.62.degree..+-.0.2.degree., 24.14.degree..+-.0.2.degree., and 27.32.degree..+-.0.2.degree., respectively, in a X-ray diffraction spectrum obtained by performing a X-ray diffraction method using CuK.alpha. as a source of radiation, and having a lattice constant of:a=16.3058 .ANG., b=23.078 .ANG., and c=8.7115 .ANG.,.alpha.=101.352.degree., .beta.=23.078.degree., and .gamma.=117.530.degree. ,with an allowable error of .+-.1%.

Abstract: An electrophotographic photosensitive member including a photosensitive layer on a conductive substrate thereof. The photosensitive layer contains a charge transport polyester resin containing at least one of structures represented by the following general formulas (I-1) and (I-2) as a partial structure of repeated units; and at least one bisazo pigment represented by the following general formula (A) or condensational and polycyclic aromatic pigment: ##STR1## where R.sub.1 to R.sub.4 are each independently, a hydrogen atom or the like, X is a bivalent aryl group, k and I are 0 or 1 and T is a hydrocarbon radical,Cp-N.dbd.N-G-N.dbd.N-Cp' (A)wherein Cp and Cp' are each a coupler and G is a predetermined bivalent group.