Abstract: A mixture is made of a plurality of different titanyltetraazaporphyrin compounds, each of which is represented by formula (1): 1

Abstract: A mixture is made of a plurality of different titanyltetraazaporphyrin compounds, each of which is represented by formula (1): wherein A, B, C and D are each independently an unsubstituted or substituted benzene ring or pyridine ring, a substituent thereof being selected from the group consisting of nitro group, cyano group, a halogen atom, an alkyl group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, and an aryl group. The above-mentioned mixture is contained in a photoconductive layer of an electrophotographic photoconductor as a photoconductive material.

Abstract: A pigment includes a compound with a tetraazaporphyrin skeleton represented by formula (I): ##STR1## wherein M is a hydrogen atom, or an atom or compound capable of bonding to tetraazaporphyrin through a covalent bond or a coordinate bond; and R.sup.1 to R.sup.8 are each independently a hydrogen atom, a lower alkyl group which may have a substituent, or an aryl group which may have a substituent. In addition, the above-mentioned pigment is used as a charge generation material in an electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon.

Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon which contains as a charge generation material a pigment including a compound with a tetraazaporphyrin skeleton represented by formula (I): ##STR1## wherein M is a hydrogen atom, or an atom or compound capable of bonding to tetraazaporphyrin through a covalent bond or a coordinate bond; and R.sup.1 to R.sup.4 are each independently a hydrogen atom, a lower alkyl group which may have a substituent, or an aryl group which may have a substituent.

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: Cycolpentadiene derivative compounds, and an electrophotographic photoconductor comprising one cyclopentadiene derivative compound are disclosed. The cyclopentadiene derivative compounds are novel and 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: 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 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: 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 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: 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: An electrophotographic photoconductor is composed of an electroconductive support, and a photoconductive layer formed on the electroconductive support, which contains a charge generating material and a charge transporting material consisting of an .alpha.-cyanostilbene compound of formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each represent a phenyl group, a polycyclic aromatic group selected from the group consisting of a naphthyl group, an anthracenyl group, a phenanthrenyl group, and a pyrenyl group, or a heterocyclic group selected from the group consisting of a pyridyl group, a furanyl group, and a quinolyl group.

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 a metallocene 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 a metallocene 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 optically active azo compound is represented by the following general formula (I), ##STR1## where R is an alkyl group having from 1 to 20 carbon atoms, and R* is an optically active radical of an alkyl group or a halogen substituted alkyl group having from 1 to 10 carbon atoms. A liquid crystal composition contains this compound. A method for producing an optically active azo compound represented by the following general formula (I) has the step of reacting a phenol compound represented by the following general formula (II) with an optically active carboxylic acid represented by the following general formula (III) using a condensing agent at a room temperature.

Abstract: An optically active stilbene compound of formula (I): ##STR1## wherein R is an alkoxy group with 20 or less carbon atoms; n is an integer of 1 or 2; and R* is an optically active group, a substituted benzylphosphonate compound of formula (II) serving as an intermediate for preparing the above active stilbene compound, ##STR2## wherein X represents ##STR3## R' is an alkyl group having 1 to 5 carbon atoms, or an unsubstituted or substituted aryl group; and R* is the same as in formula (I), a method of producing the optically active stilbene compound of formula (I), and a liquid crystal composition containing the optically active stilbene compound of formula (I) are disclosed.

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: The present invention discloses novel optically active oxazoline compounds represented by the formula (I): ##STR1## wherein R.sup.1 represents an alkoxy group having not more than 20 carbon atoms and R.sup.2 represents a low grade alkyl group, as well as liquid crystal compositions containing said compound and a switching mode of high response speed using them. Furthermore, the invention discloses that the devices using said liquid crystal compositions can suitably be used in the opto-electronics field not only for display device but also as various electro-optic devices.

Abstract: An optically active stilbene compound of formula (I): ##STR1## wherein R is an alkoxy group with 20 or less carbon atoms; n is an integer of 1 or 2; and R* is an optically active group, a substituted benzylphosphonate compound of formula (II) serving as an intermediate for preparing the above active stilbene compound, ##STR2## wherein X represents ##STR3## R' is an alkyl group having 1 to 5 carbon atoms, or an unsubstituted or substituted aryl group; and R* is the same as in formula (I), a method of producing the optically active stilbene compound of formula (I), and a liquid crystal composition containing the optically active stilbene compound of formula (I) are disclosed.

Abstract: The present invention discloses novel optically active oxazoline compounds represented by the formula (I): ##STR1## wherein R.sup.1 represents an alkoxy group having not more than 20 carbon atoms and R.sup.2 represents a low grade alkyl group, as well as liquid crystal compositions containing said compound and a switching mode of high reponse speed using them. Furthermore, the invention discloses that the devices using said liquid crystal compositions can suitably be used in the opto-electronics field not only for display device but also as various electro-optic devices.

Abstract: Styrene derivatives of the formula ##STR1## 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 represents a lower alkyl group, an aralkyl group, or an unsubstituted or substituted phenyl group.