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: An exhaust system of a liquid electrophotography printer includes: an exhaust line to discharge air inside an engine cell to an outside thereof; at least one exhaust fan, which is installed inside the exhaust line to generate and move the air inside the engine cell; a heating coil to heat the air to be discharged through the exhaust line to ignite impurities contained in the air; and an oxidative catalyst filter to filter and deodorize the impurities. The heating coil may be installed inside the exhaust line and coated with platinum on the outer surface. The oxidative catalyst filter may be installed inside the exhaust line, and may be a metallic honeycomb carrier coated with a catalyst mixture, or a non-woven heating mat coated with a catalyst mixture. The heating coil and the oxidative catalyst filter are typically sequentially installed adjacent to each other.

Abstract: A composition forms an overcoat layer for an organic photoreceptor by combining an organic silane compound, an acrylic polymer, polyvinyl butyral and a solvent. The organic photoreceptor has increased electrical and mechanical properties, leading to improved life characteristics. Also, unlike when a single material of either acrylic polymer or silsesquioxane is used in forming an overcoat layer, when the composition of the present invention is used, it is not necessary to coat a primer or an adhesive layer, thereby simplifying a coating process and reducing the cost required in forming additive layers.

Abstract: A method for preparing polymer latex particles having a core/shell structure includes the steps of: forming a dispersion of colorant; heating and mixing an organic phase comprising core monomers and wax to form a blend of the wax and monomers; mixing the dispersion of colorant with the blend of wax and monomers, and adding a first polymerization initiator for forming the core to the resultant mixture to perform polymerization, thereby forming core polymer particles comprising the wax and colorant; and mixing shell-forming monomers with the polymer particles comprising the wax and colorant, and adding a second polymerization initiator for forming the shell to the resultant mixture to perform polymerization, thereby forming a shell layer on the core polymer particles, wherein the colorant is a pigment, and the polymerization initiator for forming the core includes an azo-based polymerization initiator.

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: 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: The invention is directed to an electrophotographic photoreceptor, and an electrophotographic cartridge and an electrophotographic imaging apparatus including the electrophotographic photoreceptor. The electrophotographic photoreceptor includes: an electrically conductive substrate; a charge generating layer formed on the electrically conductive substrate and comprising ?-oxo-gallium phthalocyanine dimer as a charge generating material dispersed in a binder resin; and a charge transporting layer formed on the charge generating layer. The charge transporting layer includes a charge transporting material and a binder resin. The charge transporting material is a combination of (1) a butadiene-based amine compound and a hydrazone compound and (2) a combination of a first benzidine compound and a second benzidine compound. The amount of the charge transporting material is 5-200 parts by weight based on 100 parts by weight of the binder resin of the charge transporting layer.

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 developer cartridge for a wet-type image forming apparatus comprises a cartridge body in which developer is stored. The cartridge body has a supply hole formed thereon to supply the developer in the cartridge to the image forming apparatus. A filter is disposed in the cartridge body to improve the dispersion of the developer, and to filter sludge of the developer before the developer flows into the supply hole.

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 preparing a toner composition includes mixing a colorant dispersion and a latex solution and coagulating to form the core of the toner particle; adding a polymerization initiator to the core; and adding a monomer to the core to form a shell of the toner particle through polymerization on the core surface. According to the present invention, a toner composition by which a shape of a toner may be readily embodied even with high durability, may be prepared by a toner having core/shell structures.

Abstract: A wet-type electrophotographic printer having a photocatalystic filter includes a discharge passage through which air inside a printer body is discharged out, at least one discharge fan positioned inside the discharge passage to guide the air inside the printer body, and a photocatalystic filter positioned inside the discharge passage and having a photocatalystic body coated with a photocatalyst, a plasma electrode and a plasma generator to filter and deodorize the air inside the printer body. Accordingly, a bad smell and air pollution from evaporation of a liquid carrier can be solved, and an excellent printing quality is provided.

Abstract: A preparation method of a polyester resin includes: under predetermined depolymerization conditions, mixing a polyester resin, a resin dissolvent and a polycondensation catalyst to depolymerize the polyester resin and form a first reaction mixture; adding a first monomer to the first reaction mixture to form a second reaction mixture; under predetermined polymerization conditions, adding a second monomer to the second reaction mixture to polymerize the depolymerized polyester resin and form a third reaction mixture; and adding a neutralizing agent to neutralize the polymerized reaction product of the third reaction mixture.

Abstract: A test apparatus to evaluate the electrical properties of a liquid toner in which a printing quality of the liquid toner may be predicted by evaluating the electrical properties of the liquid toner without performing printing. The test apparatus to evaluate the electrical properties of a liquid toner includes a roller, a conductive flat panel positioned below the roller to move a predetermined distance in contact with the roller, a power supply device applying a voltage to the roller and the conductive flat panel, and a voltage tester provided at the rear of the roller to move together with the roller, testing a voltage of the liquid toner arranged on the conductive flat panel.

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.