37results about How to "Low residual potential" patented technology

A charge transporting material for use in an electrophotographic photoreceptor, which comprises a compound represented by the formula (1); and an electrophotographic photoreceptor using this charge transporting material. As the electrophotographic photoreceptor using the charge transporting material, there are illustrated, for example, a lamination type photoreceptor having a charge generating layer 2 and a charge transporting layer 3 and, as needed, an interlayer 7, and a single layer type photoreceptor. In the formula, R<1> to R<5> each independently represents a hydrogen atom, an alkyl group, a halogen atom, an alkoxy group, an aryl group or a substituted aryl group, and R<6> represents a hydrogen atom, an alkyl group, an aryl group or a substituted aryl group.

An electrophotographic photoconductor having a layer of a crosslinked resin obtained by reacting an epoxy group-containing amine compound having a charge transferability-imparting group with at least one silicon compound selected from an epoxy ring-free alkoxysilane compound, an epoxy ring-free silanol compound, an epoxy ring-containing alkoxysilane compound and an epoxy ring-containing silanol compound.

An object of the present invention is to provide a charge transport material and an electrophotographic photoreceptor using the charge transport material, the charge transport material sufficiently satisfying characteristics conventionally desired for a charge transport material for an electrophotographic photoreceptor, specifically, the charge transport material having a good solubility in a binder polymer, allowing formation of a stable and high-concentration organic thin film therefrom, and having a high carrier mobility. To achieve the object, the present invention provides a tris(4-styrylphenyl)amine derivative represented by the following general formula (1):wherein R1 represents a methyl group or methoxy group, and R2 represents a hydrogen atom, methyl group, or methoxy group, provided that a case where R1 and R2 are a methyl group and R2 is at the meta-position is excluded; wherein 50% or more of geometrical isomers have three double bonds which are all trans.

An object of the present invention is to provide an image forming apparatus containing an electrophotographic photoconductor, a charging unit, an exposing unit, a developing unit, a transfer unit and a cleaning unit,wherein the electrophotographic photoconductor contains a support and at least a photosensitive layer disposed on the support, wherein the photosensitive layer contains a charge generating material and a compound expressed by the following Structural Formula (1), andwherein, in the Structural Formula (1), “R1” and “R2” may be identical to each other or different, and represent any one of hydrogen atom, alkyl group which may be substituted, cycloalkyl group which may be substituted and aralkyl group which may be substituted. “R3”, “R4”, “R5”, “R6”, “R7”, “R8”, “R9”, “R10”, “R11”, “R12”, “R13” and “R14” may be identical to each other or different, and represent any one of hydrogen atom, halogen atom, cyano group, nitro group, amino group, hydroxyl group, alkyl group which may be substituted, cycloalkyl group which may be substituted and aralkyl group which may be substituted. “n” is a number of replication and represents an integer of 0 to 100.

An electrographic photoreceptor has an underlying layer, which is formed on a conductive support and contains metal oxide particles and a binder resin, and a photosensitive layer formed on the underlying layer. In order to provide the electrographic photoreceptor with high sensitivity and a low residual potential, the underlying layer is so formed that the volume average particle diameter, measured by a dynamic light scattering method, of the metal oxide particle in a solution dispersed in a solvent including methanol and 1-propanol mixed with a weight ratio of 7:3 is made at most 0.1 [mu]m and the cumulative 90% particle diameter is made at most 0.3 [mu]m. In addition, the photosensitive layer includes crystalline phthalocyanine having one or more clear main diffraction peaks at Bragg angles (2theta +- 0.2 DEG) of 27.0 DEG to 29.0 DEG in an X-ray diffraction spectrum.

The present invention provides a triphenylamine derivative represented by general formula (1). (In the formula, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14 and R15 independently represent a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted alkoxy group.)

To provide an electrophotographic photoreceptor having a high sensitivity, a good balance of various electric properties such as chargeability and residual potential, a good stability of the coating solution, and an excellent light resistance.An electrophotographic photoreceptor comprising an electroconductive support having thereon a photosensitive layer, wherein the photosensitive layer contains a compound represented by the following formula (1):(wherein R1 represents a group having a chiral center, R2 represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group which may have a substituent, R3 and R4 each independently represents an alkylene group which may have a substituent, or an arylene group which may have a substituent, and R5, R6, R7 and R8 each independently represents an alkyl group which may have a substituent, or an aryl group which may have a substituent, and at least one member of R5 to R8 is an aryl group having a substituent).

[Problems] To provide a novel compound which has a high carrier mobility and is useful as a charge-transporting agent that is not only capable of stably forming a photosensitive layer without precipitating crystals or forming pinholes at the time of forming the photosensitive layer but is also capable of forming an organic photosensitive material for electrophotography that has a high sensitivity and a low residual potential.[Means for Solution] A diphenylnaphthylamine derivative represented by the following general formula (1),wherein R1 to R3 are alkyl groups, k is an integer of 0 to 3, j is an integer of 0 to 4, l is an integer of 0 to 6, and X1 and X2 are hydrocarbon groups having at least one ethylenically unsaturated bond.

To provide an electrophotographic photoreceptor having a high sensitivity, a good balance of various electric properties such as chargeability and residual potential, a good stability of the coating solution, and an excellent light resistance.An electrophotographic photoreceptor comprising an electroconductive support having thereon a photosensitive layer, wherein the photosensitive layer contains a compound represented by the following formula (1):(wherein R1 represents a group having a chiral center, R2 represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group which may have a substituent, R3 and R4 each independently represents an alkylene group which may have a substituent, or an arylene group which may have a substituent, and R5, R6, R7 and R8 each independently represents an alkyl group which may have a substituent, or an aryl group which may have a substituent, and at least one member of R5 to R8 is an aryl group having a substituent).