Patent application number | Description | Published |
20090136861 | ELECTROPHOTOGRAPHIC PHOTORECEPTOR, IMAGE-FORMING APPARATUS, AND ELECTROPHOTOGRAPHIC CARTRIDGE - An electrophotographic photoreceptor having high sensitivity and low residual potential is provided. The electrophotographic photoreceptor includes an undercoat layer containing metal oxide particles and a binder resin on an electroconductive substrate, and a photosensitive layer disposed on the undercoat layer, wherein the metal oxide particles have a volume average particle diameter of 0.1 μm or less and a 90% cumulative particle diameter of 0.3 μm or less which are measured by a dynamic light-scattering method in a liquid of the undercoat layer dispersed in a solvent mixture of methanol and 1-propanol at a weight ratio of 7:3; and the photosensitive layer contains crystalline phthalocyanine showing at least one distinct main diffraction peak at a Bragg angle (2θ±0.2°) of 27.0° to 29.0° in an X-ray diffraction spectrum. | 05-28-2009 |
20090162097 | COATING LIQUID FOR UNDERCOATING LAYER FORMATION, AND ELECTROPHOTOGRAPHIC PHOTORECEPTOR HAVING UNDERCOATING LAYER FORMED BY COATING OF SAID COATING LIQUID - To provide a coating fluid for forming an undercoat layer having high stability, a high quality and long-life electrophotographic photoreceptor capable of forming a high quality image in various environments, with which image defects such as black spots or color spots hardly occur, an image forming apparatus using such a photoreceptor, and an electrophotographic cartridge using such a photoreceptor. | 06-25-2009 |
20090202274 | COATING FLUID FOR PHOTOSENSITIVE-LAYER FORMATION, PROCESS FOR PRODUCING THE SAME, PHOTORECEPTOR PRODUCED WITH THE COATING FLUID, IMAGE-FORMING APPARATUS EMPLOYING THE PHOTORECEPTOR, AND ELECTROPHOTOGRAPHIC CARTRIDGE EMPLOYING THE PHOTORECEPTOR - A coating fluid for photosensitive-layer formation having high productivity and stability and a process thereof are provided. Also provided are a high-performance electrophotographic photoreceptor and an image-forming apparatus which are capable of forming high-quality images even in various use environments and are less apt to cause image defects such as black spots or color spots. The objects are accomplished with a process for producing a coating fluid which is for forming a photosensitive layer of an electrophotographic photoreceptor and comprises a charge-generating material and a binder resin, wherein a dispersing medium having an average particle diameter in the range of from 1.0 μm to 350 μm is used as a dispersing medium for dispersing the charge-generating material in the coating fluid for photosensitive-layer formation. The coating fluid for photosensitive-layer formation produced by this process is preferable as a photosensitive layer of an electrophotographic photoreceptor. The charge-generating material preferably comprises a phthalocyanine pigment and the phthalocyanine pigment in the coating fluid preferably has a 50% cumulative particle diameter (D | 08-13-2009 |
20090208249 | COATING LIQUID FOR FORMING UNDERCOAT LAYER, METHOD FOR PREPARING COATING LIQUID FOR FORMING UNDERCOAT LAYER, ELECTROPHOTOGRAPHIC PHOTORECEPTOR, IMAGE-FORMING APPARATUS, AND ELECTROPHOTOGRAPHIC CARTRIDGE - Provided is a coating liquid for forming an undercoat layer of an electrophotographic photoreceptor exhibiting high stability. In the coating liquid for forming an undercoat layer of an electrophotographic photoreceptor containing metal oxide particles and a binder resin, the metal oxide particles have a cumulative volume average diameter D | 08-20-2009 |
20090208250 | ELECTROPHOTOGRAPHIC PHOTORECEPTOR, IMAGE-FORMING APPARATUS, AND ELECTROPHOTOGRAPHIC CARTRIDGE - An electrophotographic photoreceptor having high sensitivity and hardly affected by the transfer in an electrophotographic process is provided. The electrophotographic photoreceptor includes an undercoat layer containing metal oxide particles and a binder resin and a photosensitive layer disposed on the undercoat layer, wherein the metal oxide particles have a volume average particle diameter of 0.1 μm or less and a 90% cumulative particle diameter of 0.3 μm or less which are measured by a dynamic light-scattering method in a liquid of the undercoat layer dispersed in a solvent mixture of methanol and 1-propanol at a weight ratio of 7:3, and the photosensitive layer contains a binder resin having an ester bond. | 08-20-2009 |
20090232552 | COATING LIQUID FOR FORMING UNDERCOAT LAYER, PHOTORECEPTOR HAVING UNDERCOAT LAYER FORMED OF THE COATING LIQUID, IMAGE-FORMING APPARATUS INCLUDING THE PHOTORECEPTOR, AND ELECTROPHOTOGRAPHIC CARTRIDGE INCLUDING THE PHOTORECEPTOR - Provided are a coating liquid for forming an undercoat layer exhibiting high stability, a process for forming the coating liquid, a high-performance electrophotographic photoreceptor that is capable of forming a high-quality image under various use environments and exhibiting reduced image defects such as black spots and color spots, and an image-forming apparatus and electrophotographic cartridge including the electrophotographic photoreceptor. In the coating liquid for forming an undercoat layer of an electrophotographic photoreceptor containing metal oxide particles and a binder resin, the metal oxide particles have a number average particle diameter of 0.10μm or less and a 10% cumulative particle diameter of 0.060 μm or less which are measured by a dynamic light-scattering method in the coating liquid for forming an undercoat layer. | 09-17-2009 |
20090257776 | ELECTROPHOTOGRAPHIC PHOTORECEPTOR, IMAGE-FORMING APPARATUS, AND ELECTROPHOTOGRAPHIC CARTRIDGE - Provided is an electrophotographic photoreceptor that is excellent in electric characteristics and can form a high-quality image having reduced ghosting. In the electrophotographic photoreceptor including an undercoat layer containing metal oxide particles and a binder resin on an electroconductive support, and a photosensitive layer disposed on the undercoat layer, the metal oxide particles have a volume average particle diameter of 0.1 μm or less and a 90% cumulative particle diameter of 0.3 μm or less which are measured by a dynamic light-scattering method in a liquid containing the undercoat layer dispersed in a solvent mixture of methanol and 1-propanol at a weight ratio of 7:3; and the photosensitive layer contains a compound represented by the following Formula (I): | 10-15-2009 |
20100158561 | ELECTROPHOTOGRAPHIC PHOTOSENSITIVE BODY, METHOD FOR PRODUCING CONDUCTIVE BASE, IMAGE FORMING DEVICE, AND ELECTROPHOTOGRAPHIC CARTRIDGE - An electrophotographic photoreceptor having high performance that hardly generates image defects such as black spots, color spots, and interference fringes is provided. The electrophotographic photoreceptor includes an undercoat layer containing metal oxide particles and a binder resin on an electroconductive substrate having a maximum height surface roughness Rz in the range of 0.8≦Rz≦2 μm, and a photosensitive layer disposed on the undercoat layer, wherein the metal oxide particles have a volume average particle diameter of 0.1 μm or less and a 90% cumulative particle diameter of 0.3 μm or less which are measured by a dynamic light-scattering method in a liquid containing the undercoat layer dispersed in a solvent mixture of methanol and 1-propanol at a weight ratio of 7:3. | 06-24-2010 |