Abstract: A double-layered positively-charged organic photoreceptor t does not suffer from contamination caused by charge transport compounds that dissolve out during coating of a charge generating layer, and in which the charge generating layer and a charge transport layer have suitable interfacial properties for effective charge transfer. The composition that forms a charge transport layer on an electroconductive support contains a first charge transport compound that is soluble in an acetate solvent, a second charge transport compound that is insoluble in an acetate solvent, a binder resin, and an organic solvent. The method of manufacturing the photoreceptor includes: coating a surface of an electroconductive support with the charge transport layer forming composition and drying the surface to form a charge transport layer; and coating a surface of the charge transport layer with a charge generating layer forming composition and drying the surface to form a charge generating layer.

Abstract: Naphthalenetetracarboxylic acid diimide derivatives include a structure represented by the following formula: in which, R1, R2, and R3 are each independently any one selected from the group consisting of hydrogen; halogen; substituted or unsubstituted alkyl of C1 to C20; substituted or unsubstituted alkoxy of C1 to C20; substituted or unsubstituted aryl of C6 to C30; and substituted or unsubstituted aralkyl of C7 to C30. An electrophotographic photoconductive material includes the naphthalenetetracarboxylic acid diimide derivatives as an electron transferring material.

Abstract: An electrophotographic photoreceptor and an electrophotographic imaging apparatus employing the photoreceptor are disclosed. The electrophotographic photoreceptor includes an electrically conductive substrate and a photosensitive layer formed on the electrically conductive substrate, wherein a latent image is formed on the photosensitive layer using a blue-violet exposure light source having a wavelength of 380 to 450 nm. The outer surface of the photosensitive layer includes a charge generating material, a charge transporting material, and a binder resin. The light transmittance of the photosensitive layer is 1.0×10?1 to 1.0×10?3 in the light exposure wavelength. The electrophotographic photoreceptor can provide high quality images with high resolution using the blue-violet exposure light source.

Abstract: An electrophotographic photoreceptor includes an electron transporting material in a charge-generating layer. The electrophotographic photoreceptor includes a conductive substrate; a charge generating layer formed on the conductive substrate and includes a charge generating material and electron transporting material; and a charge transporting layer formed on the charge generating layer and includes a charge transporting material, wherein the electron transporting material is a phenylazomethylene-cyclohexadienone derivative represented by the following Formula I: wherein R1 and R2 are independently selected from the group consisting of a substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C7-C30 aralkyl and a halogen; A is selected from the group consisting of nitro, cyano and sulfone; 1 is an integer between 1 and 4; m is 0 or an integer between 1 and 4; and n is an integer between 1 and 5.

Abstract: A two-layered electrophotographic photoreceptor is formed. The two-layered electrophotographic photoreceptor includes an electrically conductive substrate and a charge generating layer and a charge transporting layer form on the electrically conductive substrate, wherein the charge generating layer is a naphthalenetetracarboxylic acid diimide derivative represented by: The two-layered electrophotographic photoreceptor has high photosensitivity and low residual potential.

Abstract: A multi-layered electrophotographic positively charged organic photoconductor includes a conductive substrate, a charge transport layer formed on the conductive substrate, and a charge generating layer formed on the charge transport layer. A composition to form the charge transport layer includes at least one hole transport material, a binder resin and an organic solvent, and a composition to form the charge generating layer includes a charge generating material, a binder resin, an organic solvent and a hole transport material. An organic photoconductor has improved static electrical properties by controlling interfacial conditions of the charge transport layer and the charge generating layer. The charge generating layer may be readily coated on the charge transport layer. In addition, the organic photoconductor has excellent electric properties such as an improved sensitivity and a low discharge voltage.

Abstract: Charge transport compounds are described that have a multiple number of hydrazone-bridged (N,N-disubstituted)arylamine groups connected by a central bridging group. Examples of charge transport compounds of this invention are those having the following generic formula: (R—Q)n-Y where R is an (N,N-disubstituted)arylamine group; Q comprises an aromatic hydrazone linking group; Y comprises a bridging group between R—Q—groups; and n is an integer between 2 and 6. An organic photoreceptor includes (a) that compound and (b) a charge generating compound; and (c) an electrically conductive substrate.

Abstract: An electrophotographic photoreceptor includes a pyridine-substituted asymmetric naphthalenetetracarboxylic acid diimide derivative. The pyridine-substituted asymmetric naphthalenetetracarboxylic acid diimide derivative has increased solubility in organic solvents, improved compatibility with binder resins and enhanced resistance for nitrogen oxides. The electrophotographic photoreceptor containing the asymmetric naphthalenetetracarboxylic acid diimide compound according to the present invention can maintain a constant surface potential and durability after being repeatedly used for an extended time. The electrophotographic photoreceptor according to the present invention can provide a high image quality for an extended time. The invention is also directed to an electrophotographic imaging apparatus, an electrophotographic cartridge and to novel pyridine-substituted asymmetric naphthalenetetracarboxylic acid diimide derivatives.

Abstract: An electrophotographic photoreceptor and an electrophotographic imaging apparatus include an asymmetric naphthalenetetracarboxylic acid diimide derivative. The asymmetric naphthalenetetracarboxylic acid diimide derivative has increased solubility in organic solvents and improved compatibility with binder resins, thus providing excellent electron transporting ability. The electrophotographic photoreceptor containing the asymmetric naphthalenetetracarboxylic acid diimide compound according to the present invention can maintain a constant surface potential after being repeatedly used for an extended time. The electrophotographic photoreceptor according to the present invention can provide a high image quality for an extended time.

Abstract: A single layered electrophotographic photoreceptor includes a photosensitive layer having having at least a charge generating material, a charge transport material and a binder on a conductive support, wherein the charge generating material is amorphous titanylphthalocyanine, and the photosensitive layer is a hindered phenol compound and/or hindered amine compound.

Abstract: A polymer has stilbenquinone structures as a repetitive unit and an electrophotographic photoreceptor containing the polymer. More particularly, the polymer has an improved electro-transporting capacity in that precipitation does not occur even when the polymer is used as an electron transporter for an electrophotographic photoreceptor in a high concentration.

Abstract: An electrophotographic photoreceptor for wet development including an electrically conductive substrate, and an organic photosensitive layer formed on the electrically conductive substrate, wherein a surface layer of the organic photosensitive layer includes at least a binder resin comprising a polymer compound and a charge transport material comprising a low molecule compound, the surface layer having an oxygen gas permeation coefficient of 5×10?13 cm3 (STP)*cm/s*cm2*cmHg or less. The electrophotographic photoreceptor has high durability for liquid developer used in a wet development technique and can produce good image characteristics.

Abstract: An electrophotographic photoreceptor is provided containing a specific asymmetric naphthalenetetracarboxylic acid diimide derivative having a nitro group. An electrophotographic imaging apparatus, an electrophotographic cartridge, and an electrophotographic drum employing the electrophotographic photoreceptor are also provided. The naphthalenetetracarboxylic acid diimide derivative has high solubility in an organic solvent, compatibility with a binder resin, and electron transporting ability. The electrophotographic photoreceptor manufactured using the naphthalenetetracarboxylic acid diimide derivatives has an excellent electrostatic property.

Abstract: A composition for an overcoat layer suitable for use in an organophotoreceptor for liquid toner, an organophotoreceptor manufactured by employing the composition and an electrophotographic imaging apparatus containing the organophotoreceptor. Since the organophotoreceptor can maintain higher charge potential and low residual or discharge potential, the lifetime of the organophotoreceptor can be extended. Also, since the organophotoreceptor has good solvent resistance and abrasion resistance, it can be advantageously used for liquid toner.

Abstract: A naphthoquinone derivative is utilized in an electrophotographic photoreceptor as an electron-transporting material. The electrophotographic photoreceptor is improved in terms of solubility in an organic solvent, compatibility with a binder resin, and electron transport capability.

Abstract: A single layered electrophotographic photoreceptor includes a photosensitive layer having at least a charge generating material, a hole transporting material, an electron transporting material, and a binder on a conductive support. The photosensitive layer includes a peculiar charge transfer complex (CT-complex) formed by the hole transporting material and the electron transporting material.

Abstract: A method of making a coating composition yields a single layered photosensitive layer including a pigment powder, which acts as a charge generating material (CGM), dispersed in a solution of a binder resin. The method includes adding the pigment powder, a hole transporting material, an electron transporting material, and the binder resin to a solvent to wet the pigment powder; and homogenizing the components while pulverizing the pigment powder.

Abstract: A composition for a charge generating layer of a positively-charged electrophotographic organophotoreceptor and a method of manufacturing same. The charge generating layer composition for the positively-charged electrophotographic organophotoreceptor, which has a charge transport layer and a charge generating layer sequentially coated on a conductive support, includes a charge generating material, a binder, and an organic solvent containing an alcoholic solvent and an acetate solvent in a ratio from 1:9 to 5:5 by weight.

Abstract: An electrophotographic photoreceptor containing a naphthalenetetracarboxylic acid diimide derivative of Formula (1), which has a branched alkyl group substituted with an aryl group at the ?-position with regard to nitrogen atoms of imide groups: wherein R1 and R2 are independently selected from the group consisting of a hydrogen atom, a halogen atom, a C1-C20 substituted or unsubstituted alkyl group, and a C1-C20 substituted or unsubstituted alkoxy group; R3 is selected from the group consisting of a C1-C20 substituted or unsubstituted alkyl group, a C1-C20 substituted or unsubstituted alkoxy group, a C7-C30 substituted or unsubstituted aralkyl group, and a group having the formula —(CH2)n—Y—R4; Ar is a C6-C30 substituted or unsubstituted aryl group; Y is an oxygen or sulfur atom; R4 is a hydrogen atom or a C1-C20 substituted or unsubstituted alkyl group; and n is an integer between 1 and 12.

Abstract: A composition forms an overcoat layer of an organophotoreceptor, the composition including polyaminoether and a solvent, and an organophotoreceptor employing the overcoat layer formed from the composition. The polyaminoether is represented by Formula 1: wherein n is an integer from 10 to 400.