Patent application number | Description | Published |
20100081073 | Titanyl phthalocyanin crystal, method for preparing the same and electrophotographic photoconductor - According to the present invention, a titanyl phthalocyanin crystal excellent in storage stability in organic solvents, a method for preparing the same and an electrophotographic photoconductor using the same are provided. In the titanyl phthalocyanin crystal, the method for preparing such a titanyl phthalocyanin crystal and the electrophotographic photoconductor using the same, the titanyl phthalocyanin crystal is characterized by having the maximum peak at a Bragg angle 2 θ±0.2°=27.2° in a CuKα characteristic X-ray diffraction spectrum and one peak within the range of 270 to 400° C. other than a peak accompanied by the vaporization of adsorbed water in a differential scanning calorimetric analysis. | 04-01-2010 |
20100189482 | DRUM UNIT AND IMAGE-FORMING APPARATUS INCLUDING THE SAME - In some embodiments, a drum unit may include an electrophotographic photosensitive member having a base member and a photosensitive layer on the base member. An embodiment may include a cleaning blade configured to abut the photosensitive layer to remove a developer remaining on the photosensitive layer of the electrophotographic photosensitive member. Some embodiments may include side seals disposed at both ends of the cleaning blade to inhibit leakage of the developer. In some embodiments, a portion of a side seal may be in contact with at least a portion of the surface and an end face of the photosensitive layer. | 07-29-2010 |
20110046392 | Oxo-titanylphthalocyanine crystal, method for producing the same, and electrophotographic photoreceptor - The invention provides an oxo-titanylphthalocyanine crystal which is stable, is superior in dispersibility in a photoreceptive layer and efficiently contributes to improvements in sensitivity and charge retention rate of an electrophotographic photoreceptor when it is used as a charge generating agent, a method for producing the oxo-titanylphthalocyanine crystal, and an electrophotographic photoreceptor. The oxo-titanylphthalocyanine crystal has predetermined optical characteristics and thermal properties and is produced by a production method including the following steps (a) to (d): (a) a step of dissolving a crude oxo-titanylphthalocyanine crystal in an acid to obtain an oxo-titanylphthalocyanine solution; (b) a step of adding the oxo-titanylphthalocyanine solution dropwise in a poor solvent to obtain a wet cake; (c) a step of washing the wet cake with an alcohol having 1 to 4 carbon atoms; and (d) a step of stirring the washed wet cake under heating in a nonaqueous solvent to obtain an oxo-titanylphthalocyanine crystal. | 02-24-2011 |
20120296082 | Oxo-Titanylphthalocyanine Crystal, Method for Producing the Same and Electrophotographic Photoreceptor - The invention provides an oxo-titanylphthalocyanine crystal which is stable, is superior in dispersibility in a photoreceptive layer and efficiently contributes to improvements in sensitivity and charge retention rate of an electophotographic photoreceptor when it is used as a charge generating agent, a method for producing the oxo-titanylphthalocyanine crystal, and an electrophotographic photoreceptor the oxo-titanylphthalocyanine crystal has predetermined optical characteristics and thermal properties and is produced by a production method including the following steps (a) to (d): (a) a step of dissolving a crude oxo-titanylphthalocyanine crystal in an acid to obtain an oxo-titanylphthalocyanine solution; (b) a step of adding the oxo-titanylphthalocyanine solution dropwise in a poor solvent to obtain a wet cake; (c) a step of washing the wet cake with an alcohol having 1 to 4 carbon atoms; and (d) a step of stirring the washed wet cake under heating in a nonaqueous solvent to obtain an oxo-titanylphthalocyanine crystal. | 11-22-2012 |
20140212802 | MULTI-LAYERED ELECTROPHOTOGRAPHIC PHOTOSENSITE MEMBER, IMAGE FORMING APPARATUS, AND METHOD FOR PRODUCING MULTI-LAYERED ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER - A multi-layered electrophotographic photosensitive member includes a multi-layered photosensitive layer. In the multi-layered photosensitive layer, a charge generating layer that contains a charge generating material and a charge transport layer that contains a charge transport material and a binder resin are layered sequentially. The binder resin includes a polycarbonate resin represented by a formula (1). | 07-31-2014 |
20140356773 | ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER AND IMAGE FORMING APPARATUS - An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The hole transport material contains an amine stilbene derivative represented by a general formula (1), and the binder resin contains a polycarbonate resin represented by a general formula (2). | 12-04-2014 |
20150093696 | ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER - An electrophotographic photosensitive member includes a photosensitive layer that contains a charge generating material, a hole transport material, a binder resin, and a plasticizer. The hole transport material contains a triarylamine derivative represented by General Formula (1) below. The plasticizer contains at least one of a compound represented by General Formula (2a) and a compound represented by General Formula (2b) below. | 04-02-2015 |
20150118608 | MULTI-LAYER ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER - A multi-layer electrophotographic photosensitive member contains a charge generating material including oxo-titanium phthalocyanine that among diffraction peaks for Bragg angles 2θ±0.2° with respect to characteristic X-rays of CuKα having a wavelength of 1.542 Å, at least exhibits a highest diffraction peak at 27.2°. The multi-layer electrophotographic photosensitive member also contains a hole transport material including a triarylamine derivative shown in Generic Formula (1). A ratio of the hole transport material relative to a binder resin in a charge transport layer is no greater than 0.55. In Generic Formula (1), Ar | 04-30-2015 |