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: A photoreceptor for electrophotography exhibits high photosensitivity and provides excellent potential stability and durability upon repeated use. The photoreceptor for electrophotography contains, as a charge-transport material, a triphenylamine derivative represented by the following formula (1) or (2) or the mixture thereof: ##STR1## wherein each of Ar.sup.1 through Ar.sup.10 is a phenyl group which may or may not have a substituent, and the substituent on any of the groups Ar.sup.1 through Ar.sup.10 is a group or an atom selected from the group consisting of C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkylamino, C1-C4 dialkylamino, C1-C4 alkylthio, C1-C4 halogenoalkyl, amino, and a halogen atom; each of R.sup.1 through R.sup.10 represents a hydrogen atom or a methyl group; each of R.sup.11 through R.sup.15 represents a hydrogen atom, a C1-C4 alkyl group, a C6-C14 aryl group, or a C7-C14 aralkyl group, wherein the substitutents R.sup.11 through R.sup.15 may be identical to or different from one another.

Abstract: A coated donor roll comprises a core with a coating, the coating comprising a charge transporting polymer, an organic acid metal salt compound, and iodine.

Abstract: An acenaphthene compound of the following formula (1), ##STR1## wherein Ar.sub.1 is an aryl group which may have a substituent; Ar.sub.2 is a phenylene, naphthylene, biphenylene or anthrylene group which may have a substituent; R.sub.1 is a hydrogen atom, a lower alkyl group or a lower alkoxy group; X is a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent; and Y is an aryl group which may have a substituent or a group of the formula (2), ##STR2## wherein R.sub.2 is a hydrogen atom, a lower alkyl group or a lower alkoxy group, R.sub.3 is a hydrogen atom, a halogen atom or a lower alkyl group, Z is a hydrogen atom or an aryl group which may have a substituent, and m and n are an integer of from 0 to 4.

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 formula (II) and formula (III): ##STR1## wherein n, Ar.sup.1, Ar.sup.2, Ar.sup.3, R.sup.1, R.sup.2 and X are as specified in the specification, ##STR2## wherein k and j are also as specified in the specification.

Abstract: An electrophotographic photoreceptor comprises a conductive support and provided thereon, a photpreceptive layer containing a compound represented by the following Formula 1: ##STR1## wherein X represents a group capable of forming a hydrogen bond; and R.sub.1, R.sub.2 and R.sub.3 independently represent a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkoxy group, an aryl group, an aryloxy group, a heterocyclic group, a hydroxy group, a nitro group, a cyano group, an acyl group, a urethane group, a carboxyl group, a carboxylate ester group, an amido group or --NH.sub.2, --NHR or --NHCOR in which R represents alkyl or aryl; and R' and R" independently represent a hydrogen atom, an alkyl group or an aryl group or R' and R" combine with each other to form a ring.

Abstract: An electrophotographic photoconductor includes an electroconductive substrate and a photosensitive layer which is provided on the electroconductive substrate and which includes a charge generating agent, a hole charge transporting agent, and antioxidant composed of at least two antioxidant materials. In a second embodiment, the electrophotographic photoconductor includes an electroconductive substrate and a photosensitive layer which is provided on the electroconductive substrate and which includes a charge generating layer containing a charge generating agent and a charge transporting layer containing a hole charge transporting agent, and antioxidant composed of at least two antioxidant materials.

Abstract: An electrophotographic photoconductor has an electroconductive support, and a single-layered photoconductive layer formed thereon containing a charge generation material, a charge transport material, a binder resin and a mixture of a phenol compound and an organic sulfur-containing compound.

Abstract: Cyclopentadiene derivative compounds, and an electrophotographic photoconductor comprising one cyclopentadiene derivative compound are disclosed. The cyclopentadiene derivative compounds are useful for use in a photoconductive layer, and readily soluble in a binder resin. The electrophotographic photoconductor can be prepared by using a simple, effective production method. The electrophotographic photoconductor comprising one cyclopentadiene derivative compound provides a good light sensitivity and high durability.

Abstract: A near infrared light-absorbing dye comprising phthalocyanine compounds represented by the following formula (2): ##STR1## wherein in formula (2), M is two hydrogen atoms, a divalent metallic atom, a trivalent monosubstituted metallic atom, a tetravalent disubstituted metallic atom or an oxymetal atom, and L.sup.1, L.sup.2, L.sup.3 and L.sup.4 are each independently formula (a) or (b), ##STR2## in the formula (a) or (b), R.sup.1 and R.sup.3 are each a substituted or unsubstituted alkyl group, and R.sup.2 is a straight chain or branched halogenated alkyl or alkenyl group having 3 to 10 carbon atoms,X is a chlorine, bromine or iodine atom, and m is an integer of 1 to 12, provided that formula (2) represents a mixture of L.sup.1 =L.sup.2 =L.sup.3 =L.sup.4 =formula (a), L.sup.1 =L.sup.2 =L.sup.4 =formula (a) and L.sup.3 =formula (b), L.sup.1 =L.sup.4 =formula (a) and L.sup.2 =L.sup.3 =formula (b), L.sup.1 =L.sup.3 =formula (a) and L.sup.2 =L.sup.4 =formula (b), L.sup.1 =formula (a) and L.sup.2 =L.sup.3 =L.sup.

Abstract: A flexible electrophotographic imaging member including a supporting substrate and a resilient combination of at least one photoconductive layer and an overcoating layer, the at least one photoconductive layer comprising a hole transporting arylamine siloxane polymer and the overcoating comprising a crosslinked polyamide doped with a dihydroxy amine. This imaging member may be utilized in an imaging process including forming an electrostatic latent image on the imaging member, depositing toner particles on the imaging member in conformance with the latent image to form a toner image, and transferring the toner image to a receiving member.

Abstract: An electrophotographic photosensitive product comprises on a photoconductive substrate a photosensitive layer containing as a main component thereof a compound: ##STR1## wherein X is one of --Ar.sup.7 --CH.dbd.CH--Ar.sup.8 -- and a naphthylene group represented by the following formula: ##STR2## and wherein each of Ar.sup.1, Ar.sup.4, Ar.sup.7, and Ar.sup.8 represents an arylene group, each of Ar.sup.2, Ar.sup.3, Ar.sup.5, and Ar.sup.6 represents an aryl group, and each of R.sup.1 -R.sup.6 represents one of H, a lower alkyl group and an aryl group.

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: Derivatives of diiminoquinones are useful as electron transport agents in electrophotography. The diiminoquinone derivatives are inexpensive materials, requiring only two steps to synthesize, have excellent solubility and compatibility with most binders due to the presence of long alkyl chains, and evidence high electron mobility.

Abstract: An electrophotographic photosensitive member and a process cartridge and an electrophotographic apparatus. The process cartridge and the electrophotographic apparatus both contain the electrophotographic photosensitive member. The electrophotographic photosensitive member constitutes a conductive substrate and a photosensitive layer on the substrate.

Abstract: There is disclosed an electrophotosensitive material using a binding resin of a bisphenol C type, bisphenol Z type, bisphenol Z type containing a substituent or bisphenol C-copolymer type polycarbonate in combination with a hole transferring material of a specific benzidine or phenylenediamine derivative. This photosensitive material is superior in mechanical strength and repeat characteristics and has a high glass transition temperature and a high sensitivity.

Abstract: An electrophotographic photosensitive member, a process cartridge having the electrophotographic photosensitive member and an electrophotographic apparatus are provided. The electrophotographic photosensitive member has a conductive substrate and a photosensitive layer thereon, wherein the photosensitive layer contains a disazo pigment represented by the following formula (1): ##STR1## wherein R.sub.1 to R.sub.8 are the same or different and are each a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, n is a positive integer, A.sub.1 and A.sub.2 are the same or different and are each a coupler residual group having a phenolic hydroxyl group, and at least one of A.sub.1 and A.sub.2 is a coupler residual group represented by the following formula (2): ##STR2## wherein X.sub.1 is a residual group forming a polycyclic aromatic ring or a heterocyclic ring by condensing with a benzene ring, R.sub.9 and R.sub.

Abstract: A photosensitive member having stable electrophotographic characteristics can be constituted by an electroconductive support and a photosensitive layer disposed thereon and containing a novel fullerene compound having an organosilicon group as a charge-transporting substance. The fullerene compound may preferably have a polyhedral structure, particularly that of Buckminsterfullerene (C.sub.60) and be represented by the formula: C.sub.60 (A).sub.n . . . (2), wherein A denotes an organosilicon group represented by the formula: ##STR1## (wherein R.sub.1-1 and R.sub.1-2 independently denote a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted silyl group, a substituted or unsubstituted germyl group, a halogen atom, or a group constituting a substituted or unsubstituted ring by a mutual combination of R.sub.1-1 and R.sub.

Abstract: An electrophotographic photoreceptor has a conductive substrate and a photosensitive layer formed on the substrate. The photosensitive layer contains one compound which is selected from the group of the compounds represented by the formulae (I), (II), (III), (IV), and (V). Therefore, the electrophotographic photoreceptor shows stable characteristics, good durability, and long span of life in repeat use.

Abstract: An electrophotographic photosensitive member is constituted by disposing a photosensitive layer on a support. The photosensitive layer is characterized by containing a specific triphenylamine compound having at least two phenyl groups each substituted with two alkyl groups including one alkyl group located in meta-position in conjunction with nitrogen atom or each substituted with three alkyl groups. The photosensitive member is suitable for providing an electrophotographic apparatus showing excellent electrophotographic characteristics such as a high photosensitivity, a good potential stability in repetitive use, a decreased transfer memory, no crack in the photosensitive layer and no crystallization of a charge-transporting material.

Abstract: An electrophotographic photoconductor includes an electroconductive substrate, and a photoconductive layer formed thereon containing at least one tertiary amine compound of formula (I) as an effective component: ##STR1## wherein Ar.sup.1 and Ar.sup.3 each is an aryl group which may have a substituent; Ar.sup.2 is a bivalent group of a carbocyclic aromatic compound or a bivalent group of a heterocyclic compound; R.sup.1 is a hydrogen atom, an alkyl group which may have a substituent or an alkoxyl group which may have a substituent; and R.sup.2 is a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent. A novel triphenylamine compound for use in the electrophotographic photoconductor is provided.

Abstract: A photoconductor for electrophotography comprising a photoconductive layer having a thickness of 27 micro-meter or more and including as a binder resin a first polycarbonate resin having a low molecular weight constituent which has a numerical average molecular weight being 10,000 or more and under 22,000, and a second polycarbonate resin having a high molecular weight constituent which has a numerical average molecular weight being 22,000 or more and under 38,000. The photoconductor has a high durability without toner filming, a wear resistance, a stable electrophotographic characteristics and an excellent cleaning characteristic.

Abstract: An electrophotographic photoconductor includes an electroconductive support and a single-layered photoconductive layer formed thereon, containing a charge transporting material, a binder resin, and a simultaneously pulverized mixture including at least one disazo pigment of formula (1) and at least one trisazo pigment of formula (2), which is obtained by simultaneously pulverizing those azo pigments: ##STR1## wherein R.sup.1 and R.sup.2 each is hydrogen, a halogen atom, trifluoromethyl group, nitro group or cyano group; R.sup.3 is hydrogen, chlorine, fluorine, iodine, bromine, nitro group or cyano group; and Ar.sup.1, Ar.sup.2 and Ar.sup.3 each is a coupler radical, which may be the same or different.

Abstract: An electrophotographic photoreceptor is disclosed which comprises an electroconductive substrate and a photosensitive layer formed thereon, said photosensitive layer containing as a binder resin a copolycarbonate resin comprising a structural unit represented by formula (I) ##STR1## and a structural unit represented by formula (II) ##STR2## wherein X and X' each is hydrogen, a halogen, or methyl; R, a substituent, is hydroxyl, carboxyl, acetyl, or a C.sub.1-4 alkyl; and j is 0 to 3 and further containing as a charge transport material a triarylamine compound represented by formula (III) ##STR3## wherein R.sub.1 is hydrogen or methyl; k is 1 or 2; and Ar.sub.1 and Ar.sub.2 each is an optionally substituted aryl.

Abstract: A positive charging photoconductor of, preferably, 4 to 8 percent by weight metal-free phthalocyanine, 30-50 percent by weight tritolylamine and the remainder polyvinylbutyral.

Abstract: Derivatives of diiminoquinilidines are useful as electron transport agents in electrophotography. The diiminoquinilidine derivatives are inexpensive materials, requiring only two steps to synthesize, have excellent solubility and compatibility with most binders due to the presence of long alkyl chains, and evidence high electron mobility.

Abstract: In organic photoconductors (OPC's) for electrophotography, a barrier layer is placed on top of the OPC. The barrier may have 2 layers--1, an electron withdrawing layer on top of the OPC; and,--2, an electron donating layer on top of the electron withdrawing layer. The barrier layer comprises: 1. a crosslinked polymer binder; 2. a charge injection prohibiter molecule, and optionally; 3. an electron withdrawing molecule. This formulation has resulted in a long-life OPC with more than 50,000 good cycles at high severity test conditions. The OPC had not only long life during continuous use, but also long shelf life and long on-again/off-again operation life.

Abstract: Disclosed is an electrophotographic photoreceptor contains a carrier generation material represented by Formula 1 or 2 having peaks at 2.theta.=6.3.degree., 12.4.degree., 25.3.degree. and 27.1.degree. in the Bragg angle (2.theta..+-.0.2.degree.) as measured by X-ray diffraction under radiation of Cu-K.alpha. rays; said peak of 12.4.degree. has a maximum intensity and has a half width of 0.65.degree. or more; no peak being present at 11.5.degree.

Abstract: Disclosed is a photosensitive material for printing comprising a photoconductive layer containing a phthalocyanine compound and a binder resin provided on a conductive substrate. The binder resin is composed of one or more sorts of resins. At least one sort of the resin is a homopolymer of a radical-polymerizable monomer (I) of the formula: ##STR1## wherein R.sup.1 is hydrogen or a methyl group, m is an integer of 2 to 5 and n is an integer of 0 to 10. An amount of the homopolymer is 0.01 to 50% by weight based on the total amount of the binder resin.

Abstract: An electrification enhancer is either contained in the photoconductor, is present as a coating on the surface thereof, or is applied prior to use. A compound such as ammonium fluoride, a ferroelectric substance, a high molecular substance (fluorine resin) with an equivalent work function of 4.10 or greater, etc. are effective. The chargeability of the photoconductor is improved. The construction is best suited for the rear photorecording process, but is also effective in other types of contact charging recording systems.

Abstract: The present invention provides a high-capacity and high-quality electrophotographic sensitive member comprising an a-SiC photoconductive layer and an organic photosemiconductive layer piled up on an electrically conductive substrate in turn, characterized by that said a-SiC photoconductive layer is composed of elements, such as a Si element and a C element as well as a H element or a halogen element, and said a-SiC photoconductive layer comprises layer zones containing elements of the IIIa group or the Va group in the periodic table in a quantity within an appointed range.

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: A 1,4-bis(2',2'-diphenylvinyl)benzene derivative represented by formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each represents a different lower alkyl group and Me represents a methyl group, a charge transporting material containing the compound (I), and an electrophotographic photoreceptor comprising a charge transporting layer containing the charge transporting material are disclosed.

Abstract: An electrophotographic photosensitive member is constituted by disposing a photosensitive layer on an electroconductive support. The photosensitive layer is characterized by containing an arylamine compound having specific two fluorenyl groups. The photosensitive member is suitable for providing an electrophotographic apparatus showing excellent electrophotographic characteristics such as a high photosensitivity, a good potential stability in repetitive use, a decreased pause memory, and no crack in the photosensitive layer.

Abstract: The present invention provides an electrographic printing photosensitive resin composition, which exhibits a good photosensitivity in a negative corona charging system and is useful for a laser platemaking system using semi-conductor laser light within a near infrared range as a light source.Disclosed is a negative charging type printing photosensitive resin composition comprising a phthalocyanine compound (a), a mercaptoarylimidazole (thiazole) compound (b) and, if necessary, a compound selected from the group consisting of a condensed polycyclic quinone compound, a bisazo compound, a cyanine compound, a quinacridone compound and a mixture thereof (d), said compounds being dispersed in a binder resin (c). A printing photosensitive resin plate using the photosensitive resin composition is also disclosed.

Abstract: The present invention relates to a novel phenylenediamine derivative of the general formula (1): ##STR1## wherein R.sup.1 R.sup.2 R.sup.3 and R.sup.4 are selected from the group consisting of: alkyl groups, alkoxy groups, halogen atoms and aryl groups; and m, n, p and q are integers in the range of 0 to 3, andan electrophotosensitive material using the same as an electric charge transferring material.The phenylenediamine derivative is excellent in not only compatibility with binding resin but also electric charge transferring capability, particularly hole transferring capability. Therefore, a photosensitive material using the above derivative as an electric charge transferring material exhibits a higher sensitivity.

Abstract: An electrophotographic photoreceptor which is excellent in various properties, has effectively inhibited photo-induced fatigue and has stability against repeated use, and which comprises an electroconductive support and a photosensitive layer comprising as essential components a charge-generating material and a diaminodiphenyl compound represented by the general formula (I): ##STR1##

Abstract: The present invention is directed to an electrophotographic photoreceptor which is smooth without orange peel, inhibits the rise of a residual potential and the drop of a charged potential, and is excellent in stability even when it is repeatedly used.The photoreceptor comprises a charge generation material, a charge transport material, a polyarylate having a polymerization degree of 10 to 5,000, a polycarbonate having a polymerization degree of 10 to 5,000, and a polydimethylsiloxane having a polymerization degree of 0 to 2,000.

Abstract: A positively-chargeable single-layered type organic electrophotographic photoconductor composed of an electroconductive support and an organic single-layered photoconductive layer containing a charge generating material, an organic positive hole transporting material and an organic acceptor compound which are dispersed in a matrix binder agent, with the relationship of the oxidation potential (E.sub.ox) of the charge generating material.ltoreq.the oxidation potential (E.sub.ox) of the organic positive hole transporting material being satisfied.

Abstract: An electrophotographic photoconductor includes an electroconductive support and a photoconductive layer formed thereon containing a diamine compound represented by formula (I): ##STR1## wherein R.sup.1, R.sup.2, and R.sup.3 each is independently a substituted or unsubstituted alkyl group or aryl group; R.sup.4 is hydrogen, an alkyl group or an alkoxyl group; n is an integer of 1 to 3; and ##STR2## is a substituted or unsubstituted bivalent arylene group or a bivalent heterocyclic group. This diamine compound is useful as a photoconductive material for electrophotographic photoconductors.

Abstract: An electrophotographic photosensitive member is constituted by disposing a photosensitive layer on an electroconductive support. The photosensitive layer is characterized by containing a specific polycarbonate having a side chain comprising a charge-transporting group formed by nitrogen atom and benzene ring. The charge-transporting group may preferably has a specific triphenylamine structure, hydrazone structure or biphenyldiamine structure. The photosensitive layer is suitable for providing an electrophotographic apparatus showing excellent electrophotographic characteristics such as a high photosensitivity, a good potential stability in repetitive use.

Abstract: An electrophotographic photoconductor is composed of an electroconductive substrate, and a photoconductive layer formed thereon, which contains a charge generating material, and a vinylidene compound of formula (I): ##STR1## wherein Ar represents an aromatic group; and X represents cyano group, an alkyl group having 1 to 8 carbon atoms, or an alkoxycarbonyl group represented by --COOC.sub.n H.sub.2n+1, in which n is an integer of 1 to 8; or a vinylidene compound of formula (II):Ar--CH.dbd.C(COOR).sub.2 (II)wherein Ar represents an aromatic group; and R represents an alkyl group having 1 to 8 carbon atoms, which may form a ring in combination of two of the alkyl groups, each of these vinylidene compounds serving as a charge transporting material.

Abstract: An electrophotographic photoconductor is composed of an electroconductive support, and a photoconductive layer formed thereon which contains as a photoconductive material at least one diamine compound having carbonate groups of formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each is hydrogen, an alkyl group, or an aryl group; R.sup.1 and R.sup.2 may form a ring in combination of N bonded thereto; Y is an arylene group, ##STR2## wherein Ar.sup.1 and Ar.sup.2 each is an arylene group, R.sup.3 and R.sup.4 each is hydrogen, an alkyl group, or an aryl group, and l is an integer of 1 or 2; and R.sup.1 and Y may together form a ring, X is an alkylene group, a dialkylene ether group or an arylene group, --Ar.sup.3 -Z-Ar.sup.4 --, wherein Ar.sup.3 and Ar.sup.4 each is an arylene group; Z is an alkylene group, a dialkylene ether group or a cycloalkylidene group, oxygen, sulfur, a vinylene group, m is an integer of 0 or 1; and n is an integer of 0 to 6.

Abstract: An electrophotographic photoconductor having an electroconductive support and a photoconductive layer formed thereon containing a charge generating material, a charge transporting material and lignin.

Abstract: This invention provides: A photoconductor element comprising:an electrically conductive layer, a charge generating material and an electron transport agent in a polymeric binder, said electron transport agent comprising at least one cyclic bis-dicarboximide compound of Formula (I): ##STR1## wherein: Q.sup.1 and Q.sup.2, which may be the same or different, represent branched alkyl; unsubstituted straight-chain alkyl; unsubstituted cyclic alkyl; alkyl-substituted cyclic alkyl; unsubstituted, straight-chain, unsaturated alkyl; or H, wherein Q.sup.1 and Q.sup.2 cannot both be H; andR.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, represent hydrogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, or halogen.

Abstract: A pyrazine compound of formula (I) and a pyrazine compound of formula (II): ##STR1## wherein R is an unsubstituted or substituted phenyl group, an unsubstituted or substituted naphthyl group; and an electrophotographic photoconductor which includes an electroconductive support and a photoconductive layer formed thereon containing a charge generating material and a charge transporting material which is any of the above-mentioned pyrazine compounds of formula (I) and formula (II).

Abstract: Disclosed is an organic photosensitive material for electrophotography which is characterized by containing a specific diphenoquinone derivative in an organic photosensitive layer of the material. The diphenoquinone derivative is a compound represented by the following general formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are alkyl groups, alkoxy groups, aryl groups or aralkyl groups, and at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is an aryl group or an aralkyl group, and at least 2 of the remaining R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are alkyl groups or alkoxy groups,the organic photosensitive material mentioned above has excellent sensitivity and residual potential.

Abstract: An electrophotographic imaging member including a substrate, an optional blocking layer, an optional thermoplastic adhesive interface layer, a thin charge generation layer comprising pigment particles dispersed in a film forming polymer binder having dissolved or molecularly dispersed therein an electron accepting/transporting compound, and a charge transport layer.

Abstract: A photosensitive lithographic printing plate comprises a conductive support and provided thereon, a photoconductive layer of a composition comprising a photoconductor and an esterified compound of o-naphtho-quinonediazide sulfonic acid with a phenol resin, the phenol resin being a polycondensation compound of a monovalent phenol with an aldehyde or a ketone, and the content of the o-naphthoquinonediazide sulfonic acid residue being 0.4.times.10.sup.-3 to 3.0.times.10.sup.-3 mole per gram of the photoconductive layer.

Abstract: A photosensitive member for electrophotography have a photosensitive layer 20 provided on an electroconductive substrate 1 and, containing a compound selected from among derivatives of thiophene, diphenylthiophene or oxadiazole. When the surface of the photosensitive member was positively charged and then irradiated with white light, the half decay exposure amount with which the surface potential is decreased to half is 5 to 10 lux.cndot.sec. The photosensitive member is capable of being used in semiconductor laser printers.