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: In an electrophotographic light-sensitive material comprising at least one electric charge generation layer comprising a charge generating substance and a binder resin therefor and at least one electric charge transport layer on an electrically conductive base, said electrophotographic light-sensitive material is a laminate type electrophotographic light-sensitive material wherein the binder resin for the electric charge generating substance contains at least one polyvinylpyridine resin.

Abstract: An electrophotographic photosensitive member have a photosensitive layer, said photosensitive layer comprising at least one dis-azo pigment of Formula (I) or Formula (II) shown below: ##STR1## wherein Z represents an oxygen atom, a sulfur atom or >N--A.sub.2, wherein A.sub.2 is a hydrogen atom or a lower alkyl, A.sub.1 a hydrogen atom, a lower alkyl or a halogen atom; Ph.sub.1 an unsubstituted or substituted phenylene group, n an integer of 0 or 1, and B.sub.1 a coupler residue; with proviso that when n is 0, Z is an oxygen atom and A.sub.1 is a hydrogen atom, the case where Ph.sub.1 represents substituted phenyl radicals except for unsubstituted or mono-substituted phenyl radicals with a halogen atom, a lower alkyl or an alkoxy group;and ##STR2## wherein Ph.sub.2 represents an unsubstituted or substituted phenylene group and B.sub.2 a coupler residue.

Abstract: An electrophotographic photosensitive member comprises a layer containing a binder and at least one hydrazone compound represented by the following formula (1), (2), (3), (4), or (5): ##STR1##

Abstract: An electrophotographic photosensitive member is characterized by comprising a layer which contains at least one pyrazoline compound represented by the following formula (I) or (II): ##STR1## wherein m and n represent 0 or 1; when both m and n are 0, X.sub.1 represents a substituted or unsubstituted heterocyclic residue; R.sub.1 represents a substituted or unsubstituted aryl or heterocyclic residue; R.sub.2 and R.sub.3 each represent hydrogen or a substituted or unsubstituted aryl or heterocyclic residue; or they form spiropyrazoline cojointly with the carbon atom to which they are linked; and R.sub.5 represents hydrogen, a halogen, or a substituted or unsubstituted alkyl or aryl;when m is 1 and n is 0, X.sub.1 represents a substituted or unsubstituted heterocyclic residue; R.sub.1 and R.sub.2 each represent a substituted or unsubstituted aryl or heterocyclic residue; R.sub.3 represents hydrogen; and R.sub.4 and R.sub.

Abstract: An electrophotographic photosensitive member comprises a layer containing a hydrazone compound represented by the following formula (1) or (2): ##STR1## wherein, Z is an atomic group necessary to complete a substituted or unsubstituted heterocyclic ring; R.sub.11, R.sub.12, R.sub.21, R.sub.22 and R.sub.23 represent substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, or substituted or unsubstituted aryl, and the combinations of R.sub.11 with R.sub.12 and of R.sub.22 with R.sub.23 can form each a pyrrolidine ring, piperidine ring, or morpholine ring; n is 1 or 2; and A is a monovalent heterocyclic compound residue.

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: An electrophotographic photosensitive member is characterized by having a layer which contains at least one hydrazone compound represented by the following formula (1) or (2): ##STR1## wherein R.sub.11 represents substituted or unsubstituted naphthyl; R.sub.12 represents substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, or substituted or unsubstituted aryl; R.sub.13 represents hydrogen, alkyl, or alkoxy; R.sub.14 and R.sub.15 each represent substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, or substituted or unsubstituted aryl; n is 0 or 1; when n=1, R.sub.14 and R.sub.15, together with the nitrogen which links them, may complete a cyclic amino group; X represents a group necessary for completing a benzene ring or naphthalene ring; R.sub.21 and R.sub.22 each represent hydrogen, halogen, alkyl, alkoxy or disalkylamino; and R.sub.23, R.sub.24, R.sub.25, R.sub.26 and R.sub.

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: An electrophotographic light-sensitive medium is described comprising at least an electrically conductive layer, a charge generation layer and a charge transport layer, the charge generation layer containing a dis-azo compound represented by Formula (1) wherein A represents a single bond, ##STR1## B represents a coupler having aromatic properties; and R represents a group selected from hydrogen, a halogen and a lower alkyl having 1 to 4 carbon atoms.

Abstract: An organic photoconductive material represented by the formula ##STR1## wherein A is an atomic group necessary for completing a substituted or unsubstituted aromatic hydrocarbon ring, Ar is a substituted or unsubstituted group, and Cp is a coupler residue.

Abstract: An electrophotographic photosensitive member is characterized by comprising a charge generation layer containing at least one disazo pigment represented by the following formula [I] and a charge transport layer containing at least one hydrazone compound represented by the following formula [II]: ##STR1## wherein A is a coupler residue, B represents hydrogen, halogen, alkyl, or alkoxy, and n is an integer of 1 to 4; ##STR2## wherein R.sub.1 represents N,N-dialkyl amino, or N,N-diarylamino, or N-alkyl-N-arylamino, or alkoxy or aryloxy, each being substituted or unsubstituted; R.sub.2 and R.sub.3 each represent alkyl, aralkyl, or aryl, each being substituted or unsubstituted, or R.sub.2 and R.sub.3, together with the nitrogen atom which links them, represent nitrogen-containing heterocyclic ring; R.sub.4 represents hydrogen, or alkyl, aralkyl, or aryl, each being substituted or unsubstituted; R.sub.5 represents hydrogen, alkyl, or alkoxy; and l is 0 or 1.

Abstract: An electrophotographic photosensitive member is characterized by having a layer containing at least one hydrazone compound represented by the following formula [I] or [II]: ##STR1## wherein R.sub.11 and R.sub.12 represent hydrogen, halogen, substituted or unsubstituted alkyl, alkoxy, substituted or unsubstituted aryloxy, or substituted amino, provided that at least one of R.sub.11 and R.sub.12 is substituted amino or alkoxy; R.sub.13 and R.sub.14 represent substituted or unsubstituted alkyl or substituted or unsubstituted aryl, provided that at least one of R.sub.13 and R.sub.14 is substituted or unsubstituted aryl, or R.sub.13 and R.sub.14, together with the nitrogen atom which links them, represent a nitrogen-containing heterocyclic ring; R.sub.15, R.sub.16, R.sub.17, and R.sub.18 represent hydrogen, halogen, substituted or unsubstituted alkyl, alkoxy, substituted or unsubstituted aryloxy, or substituted amino; m and n represent 0 or 1; R.sub.21 and R.sub.

Abstract: An electrophotographic photosensitive member is characterized by having a photosensitive layer containing at least one disazo pigment represented by the formula ##STR1## wherein Cp represents a coupler residue; B.sub.1, B.sub.2, B.sub.1 ', and B.sub.2 ' independently of one another represent atoms or groups selected from the group consisting of hydrogen, halogen, lower alkyl, lower alkoxy, acylamino, and hydroxyl; and A represents ##STR2## (D.sub.1 and D.sub.

Abstract: An electrophotographic photosensitive member having a layer containing at least one compound represented by the formula ##STR1## wherein X.sub.1 represents a residue necessary for completing a substituted or unsubstituted aromatic hydrocarbon ring; X.sub.2 represents a residue necessary for completing a substituted or unsubstituted heterocyclic ring; R.sub.1, R.sub.2, R.sub.3, and A each represent hydrogen, alkyl, aralkyl, or aryl, substituted or unsubstituted; and m is 0 or 1.

Abstract: An electrophotographic photosensitive member comprises a layer containing at least one member of the hydrazone compounds of the formula: ##STR1## where R.sub.1, R.sub.2 and R.sub.3 are selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, and substituted or unsubstituted aryl, and R.sub.1 and R.sub.2 can not be simultaneously alkyl; and R.sub.4 is substituted or unsubstituted aryl.

Abstract: An electrophotographic photosensitive member having a photosensitive layer is characterized in that said photosensitive layer contains azo pigments having at least one of azo groups linked to a coupler residue represented by the following formula [1] or [2]: ##STR1## wherein R.sub.1 and R.sub.3 independently represent hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, or substituted or unsubstituted aryl, and R.sub.2 and R.sub.4 independently represent substituted or unsubstituted aryl.

Abstract: An electrophotographic light-sensitive medium is described comprising a light-sensitive layer containing a dis-azo compound represented by Formula (1) ##STR1## wherein A represents a coupler having aromatic properties.

Abstract: An electrophotographic light-sensitive medium comprising a light-sensitive layer containing a dis-azo compound represented by Formula (1) ##STR1## wherein A represents a single chemical bond, a divalent hydrocarbon group containing a conjugated double bond, a divalent hydrocarbon group containing a nitrogen atom in a conjugated double bond, or a divalent heterocyclic group which may be condensed with a benzene ring or substituted and forms a conjugated double bond system in combination with the adjacent azomethine groups, and B and B', which may be the same or different, each represents a coupler having aromatic properties.

Abstract: An electrophotographic light-sensitive medium is described comprising at least an electrically conductive layer, a charge generation layer and a charge transport layer, the charge generation layer containing a dis-azo compound represented by Formula (1) ##STR1## wherein A is a coupler having aromatic properties, and B is a group selected from hydrogen, halogen, lower alkyl having 1 to 4 carbon atoms and lower alkoxy having 1 to 4 carbon atoms.