摘要:
A resistive element is produced by forming a substrate glazed with glass, printing or coating a resistive element-forming paste onto the substrate, calcining the paste in a first heating step to form an element comprising a film on the substrate and subjecting the resulting element to a heat treatment in a second heating step to diffuse an amount of glass into the film to increase resistivity of the element.
摘要:
A resistive element film-forming paste includes (1) an organic metal compound, (2) at least one organic non-metal additive, and (3) a solution of asphalt in a solvent. A resistive element is formed by coating the paste on a substrate followed by calcining.
摘要:
An electrophotographic photoreceptor including a light-sensitive layer containing a bisazo or trisazo compound represented by formula (I-1), (II-1), (III,1), (IV-1), (V-1) or (VI-1): ##STR1##
摘要:
A resistive film-forming composition to be coated on a substrate and calcined to form a resistive film is disclosed, which contains an organic iridium compound selected from a compound represented by formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom, an alkyl group, or an alkoxy group, a compound represented by formula (II):Ir(R.sup.4 COCR.sup.3 COR.sup.5).sub.3wherein R.sup.3 represents a hydrogen atom or an alkyl group; and R.sup.4 and R.sup.5 each represent an alkyl group. A uniform resistive film having excellent electrical characteristics can be formed with good adhesion to a substrate.
摘要:
A process for preparing a squarylium compound useful as a photoconductive material for an electrophotographic photoreceptor, in which process comprises reacting an arylhydroxycyclobutenedione salt or a hydroxycyclobutenedione derivative with an aniline derivative is disclosed. The process comprises dropwise adding a solution of the arylhydroxycyclobutenedione salt or hydroxycyclobutenedione derivative in a solvent, to an alcohol solution of the aniline derivative in an alcohol solvent. An electrophotographic photoreceptor produced by using the thus obtained squarylium compound exhibits and sensitivity, satisfactory chargeability, low dark decay, low residual potential, and excellent stability after repeated use.
摘要:
An electrophotographic photoreceptor comprising an electrically conductive support having provided thereon a photosensitive layer composed of a charge generating layer and a charge transport layer, wherein said charge generating layer contains a bisazo compound represented by formula (I) ##STR1## wherein X, Y, and A are defined in the specification, and said charge transport layer contains a benzidine compound represented by formula (II) ##STR2## wherein R.sub.1, R.sub.2, and R.sub.3 are as defined in the specification. The photoreceptor exhibits high photoresponse performance even in a weak electric field and exhibits high sensitivity in a visible light region.
摘要:
An electrophotographic photoreceptor is disclosed, comprising a conductive support having provided thereon a photosensitive layer containing a bisazo compound respresented by formula (I) ##STR1## wherein Y represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, a cyano group, a nitro group or a hydroxyl group; and A represents a substituted or unsubstituted divalent aromatic hydrocarbon group or a substituted unsubstituted divalent nitrogen-containing heterocyclic group. The photoreceptor exhibits excellent sensitivity and durability.
摘要:
An electrophotographic photoreceptor comprising a conductive support having thereon a photosensitive layer is disclosed, wherein a charge transport layer constituting said photosensitive layer or a protective layer formed on said photosensitive layer contains a charge transporting agent, said charge transporting agent being dissolved in a solid state or dispersed in a polycarbonate resin containing a monomer unit represented by formula (I): ##STR1## wherein R.sub.1 represents a hydrogen atom, a methyl group, a cyano group, or a phenyl group; R.sub.2 represents a methyl group, a cyano group, or a phenyl group; or R.sub.1 and R.sub.2 are connected to each other to form a 5- or 6-membered saturated ring; X represents a chlorine atom or a bromine atom; n represents an integer; and m represents 0 or an integer.The photoreceptor exhibits high sensitivity with low residual potential.
摘要:
An electrophotographic photoreceptor is disclosed, comprising a conductive substrate having thereon a photosensitive layer, wherein the photosensitive layer comprises at least one compound selected from the group consisting of a compound of formula (I), a compound of formula (II), and a compound of formula (III) as defined below: ##STR1## wherein X.sup.I represents a cyano group, an alkoxycarbonyl group, or an aryloxycarbonyl group; R.sup.I.sub.1 and R.sup.I.sub.2 each represents a hydrogen atom, an alkyl group, an aryl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkylcarbonyl group, an arylcarbonyl group, a nitro group, a halogen atom, or a cyano group; A.sup.I represents ##STR2## wherein R.sup.I.sub.3 and R.sup.I.sub.9 each represents a hydrogen atom, an alkyl group, a nitro group, a halogen atom, or a cyano group; and m and n each represents an integer of 0 to 3; ##STR3## wherein X.sup.II represents O, C(CN).sub.2 or C(CO.sub.2 R.sup.II).sub.2, wherein R.sup.II is an alkyl group; R.sup.II.sub.1 and R.sup.II.sub.2 each represents a hydrogen atom, an alkyl group, an aryl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a nitro group, a halogen atom, or a cyano group; and m' and n' each represents an integer of 0 to 2; and ##STR4## wherein R.sup.III.sub.1 and R.sup.III.sub.2 each represents a hydrogen atom, an alkyl group, an aryl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkylcarbonyl group, an arylcarbonyl group, a nitro group, a halogen atom, or a cyano group,A.sup.III represents ##STR5## wherein R.sup.III.sub.3 and R.sup.III.sub.9 each represents a hydrogen atom, an alkyl group, a nitro group, a halogen atom, or a cyano group; and m" and n" each represents an integer of 0 to 3.
摘要:
An electrophotographic photoreceptor is disclosed, comprising an electrically conductive substrate having thereon and a light-sensitive layer, said light-sensitive layer comprising an electric charge generating layer and an electric charge transporting layer, wherein the electric charge generating layer contains an electric charge generating organic pigment having positive hole transporting properties and a pyrylium compound represented by the formula (I) or (II): ##STR1## wherein X is an oxygen atom or a sulfur atom; R.sub.1 to R.sub.5 are each a hydrogen atom, and alkyl group, a cycloalkyl group, an alkoxycarbonyl group, a benzyl group, a substituted or unsubstituted styryl group, or a substituted or unsubstituted phenyl group, and Z.sup..crclbar. is an anion.