Abstract: An electrophotographic photoreceptor containing titanyl phthalocyanine that has a maximum intensity peak of the Bragg angle 2.theta. at 27.3.degree..+-.0.2.degree. with respect to characteristic X-rays of Cu K.alpha. at a wavelength of 1.541.ANG. and which has a maximum intensity peak of 6.8.degree..+-.0.2.degree. in the 2.theta. range of 6.degree.-8.degree. is disclosed.

Abstract: The present invention relates to an electrophotographic photoreceptor containing titanyl phthalocyanine in a crystalline state that has a maximum intensity peak of the Bragg angle 2.theta. at 27.2.degree..+-.0.2.degree. crystal planes corresponding to diffraction lines at 9.6.degree..+-.0.2.degree., 11.7.degree..+-.0.2.degree. and 24.2.degree..+-.0.2.degree. in a diffraction spectrum obtained with characteristic X-rays of Cu K.alpha. at a wavelength of 1.541 .ANG., and that also has an aggregated state such that a visible and near infrared absorption spectrum has a maximum absorption in the range of 780-860 nm, said photoreceptor further containing an ethylene copolymer resin and/or a polyamide resin in an intermediate layer provided between a light-sensitive layer and an electroconductive layer or an electroconductive substrate.

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

Abstract: A photoreceptor comprising a photosensitive layer and an electroconductive support, wherein the photosensitive layer contains an azo compound represented by the following Formula [I]: ##STR1## wherein A is a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, B is an oxygen atom or a sulfur atom; R is a hydrogen atom, an alkyl group, an alkoxy group, or a halogen atom; and Cp is ##STR2## wherein Z represents a group of atoms necessary for constituting a substituted or unsubstituted aromatic carbon ring, or a substituted or unsubstituted aromatic heterocyclic ring; Y is a substituted or unsubstituted carbamoyl group or a substituted or unsubstituted sulfamoyl group;R.sub.1 is a hydrogen atom, a substituted or unsubstituted amino group, a substituted or unsubstituted carbamoyl group, a carboxy group and the esters thereof, or cyano group; A' is a substituted or unsubstituted aryl group;R.sub.2 and R.sub.

Abstract: A photoreceptor comprising a support and a photosensitive layer which contains an azo compound of the formula [I]: ##STR1## wherein Q is a halogen atom, a hydrogen atom, an alkyl group, an alkoxy group, an alkylsulfonyl group, an aryl group, an acetylamido group, ##STR2## (Q.sub.1 is an alkyl group, an alkoxy group, a phenyl group, an amino group, a hydroxy group or a hydrogen atom) or ##STR3## (Q.sub.2, Q.sub.3 and Q.sub.4 independently are an alkyl group, an alkoxy group, a phenyl group, an acyl group, an ester group, a hydroxy group, a cyano group, a vinyl group, a halogen atom or a hydrogen atom), said alkyl group, alkoxy group, aryl group, amino group and vinyl group may have a substituent; Y.sub.1 and Y.sub.

Abstract: A photoreceptor comprising a support and a photosensitive layer which contains an azo compound of the formula [I]: ##STR1## wherein P.sub.1 and P.sub.2 are independently a halogen atom, a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, an acetylamido group, an alkylsulfonyl group, ##STR2## (Q.sub.1 is an alkyl group, an alkoxy group, a phenyl group, an amino group, a hydroxy group or a hydrogen atom) or ##STR3## (Q.sub.2, Q.sub.3 and Q.sub.4 independently are a halogen atom, a hydrogen atom, an alkyl group, an alkoxy group, a phenyl group, an acyl group, an ester group, a hydroxy group or a vinyl group), the alkyl group, alkoxy group, aryl group, amino group and vinyl group may have a substituent; Y.sub.1 and Y.sub.

Abstract: A photoreceptor is disclosed which comprises a photosensitive layer and an electrically conductive support. Said photosensitive layer contains a carrier generation material and a carrier transport material, said carrier generation material being a trisazo compound of the present invention, or said photosensitive layer may consist of a carrier generation layer containing said trisazo compound and a carrier transport layer containing said carrier transport material with or without an intermediate layer being provided between said support and said photosensitive layer.