摘要:
To provide a process for producing an electrophotographic photosensitive member that can not easily cause any fog due to an increase in dark attenuation, a conductive layer is formed with use of a coating liquid for conductive layer prepared with use of a solvent, a binder material and metal oxide particles. The metal oxide particles (P) and binder material (B) in the coating liquid for conductive layer are in a mass ratio (P/B) of from 1.5/1.0 to 3.5/1.0. The metal oxide particle is a titanium oxide particle coated with tin oxide doped with phosphorus or tungsten. Where powder resistivity of the metal oxide particle is represented by x (Ω·cm) and powder resistivity of the titanium oxide particle as a core particle constituting the metal oxide particle is represented by y (Ω·cm), the y and the x satisfy the following relations (i) and (ii): 5.0×107≦y≦5.0×109 (i) 1.0×102≦y/x≦1.0×106 (ii).
摘要:
An electrophotographic photosensitive member having a specific conductive layer and promising less variation in light-area potential and residual potential in reproducing images repeatedly, and a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member are provided. Where a test in which a voltage of −1.0 kV having only a DC voltage component is continuously applied to the conductive layer for 1 hour is conducted, the conductive layer has volume resistivity satisfying the following mathematical expressions (1) and (2), as values before and after the test: −2.00≦(log|ρ2|−log|ρ1|)≦2.00 (1), and 1.0×108≦ρ1≦2.0×1013 (2), where, in the expressions (1) and (2), ρ1 is volume resistivity (Ω·cm) of the conductive layer as measured before the test and ρ2 is volume resistivity (Ω·cm) of the conductive layer as measured after the test.
摘要:
Provided are an electrophotographic photosensitive member in which leakage doesn't easily occur, a process cartridge and an electrophotographic apparatus each including the electrophotographic photosensitive member, and a method of manufacturing the electrophotographic photosensitive member. The electrophotographic photosensitive member includes a conductive layer including titanium oxide particle coated with tin oxide doped with a hetero element. When an absolute value of a maximum current amount flowing through the conductive layer in a case of performing a test of applying −1.0 kV including DC voltage to the conductive layer is defined as Ia, and an absolute value of a current amount flowing through the conductive layer in a case where a decrease ratio of a current amount per minute reaches 1% or less for the first time is defined as Ib, the relations of Ia≦6000 and 10≦Ib are satisfied. A volume resistivity of the conductive layer before the test is 1.0×108 Ω·cm to 5.0×1012 Ω·cm.
摘要:
An electrophotographic photosensitive member is provided in which black spots on an output image are hardly caused by local charge injection from a support to a photosensitive layer. For this purpose, a conductive layer is formed using a coating liquid for a conductive layer prepared using a solvent, a binder material and a metal oxide particle that satisfies the following relation (i): 45≦A×ρ×D≦65 (i) wherein A denotes the surface area of the metal oxide particle per unit mass [m2/g], D denotes the number average particle diameter of the metal oxide particle [μm], and ρ denotes the density of the metal oxide particle [g/cm3]. The metal oxide particle is a titanium oxide particle coated with tin oxide doped with phosphorus.
摘要:
A casted aluminum alloy obtained by casting a molten metal of an aluminum alloy, an aluminum alloy material obtained by at least heating the casted aluminum alloy, and methods for producing them. In the production of the casted aluminum alloy, a molten metal is obtained by melting an aluminum alloy containing 0.8 to 5 mass % of Fe, 0.15 to 1 mass % of Ti, Zr or the like as third component elements in an specific amount, and a residual part containing Al and inevitable impurities at a certain temperature (melting step). Subsequently, the molten metal is cast into a plate-like shape by a casting mold while cooling the molten metal to a temperature that is lower by at least 10° C. than a solidus temperature of the aluminum alloy at a cooling rate of 150° C./sec. or more and less than 10000° C./sec. (casting step).
摘要:
An electrophotographic photosensitive member production process is provided having the steps of placing a cylindrical substrate having a conductive surface in a first film-forming chamber, and decomposing a source gas with high-frequency power to deposit on the cylindrical substrate a first layer formed of a non-single-crystal material, taking out of the first film-forming chamber the cylindrical substrate with the first layer deposited thereon, and placing the cylindrical substrate with the first layer deposited thereon in a second film-forming chamber, and decomposing a source gas with a high-frequency power to deposit on the first layer a second layer having an upper-part blocking layer formed of a non-single-crystal material. Even where abnormal growth portions called spherical protuberances are present on the photosensitive member surface, they can be made not to appear on images, and image defects can vastly be remedied.
摘要:
An electrophotographic photosensitive member having a specific conductive layer and promising less variation in light-area potential and residual potential in reproducing images repeatedly, and a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member are provided. Where a test in which a voltage of −1.0 kV having only a DC voltage component is continuously applied to the conductive layer for 1 hour is conducted, the conductive layer has volume resistivity satisfying the following mathematical expressions (1) and (2), as values before and after the test: −2.00≦(log|ρ2|−log|ρ1|)≦2.00 (1), and 1.0×108≦ρ1≦2.0×1013 (2), where, in the expressions (1) and (2), ρ1 is volume resistivity (Ω·cm) of the conductive layer as measured before the test and ρ2 is volume resistivity (Ω·cm) of the conductive layer as measured after the test.
摘要:
A casted aluminum alloy obtained by casting a molten metal of an aluminum alloy, an aluminum alloy material obtained by at least heating the casted aluminum alloy, and methods for producing them. In the production of the casted aluminum alloy, a molten metal is obtained by melting an aluminum alloy containing 0.8 to 5 mass % of Fe, 0.15 to 1 mass % of Ti, Zr or the like as third component elements in an specific amount, and a residual part containing Al and inevitable impurities at a certain temperature (melting step). Subsequently, the molten metal is cast into a plate-like shape by a casting mold while cooling the molten metal to a temperature that is lower by at least 10° C. than a solidus temperature of the aluminum alloy at a cooling rate of 150° C./sec. or more and less than 10000° C./sec. (casting step).
摘要:
An aluminum alloy for cutting processing consists essentially of Cu: 1 to 6.5 mass %, Zn: 0.05 to 1 mass %, Bi: 0.1 to 1 mass %, Sn: 0.1 to 1 mass %, B: 100 mass ppm or less, or further includes at least one element as a selective additional element selected from the group consisting of Fe: 0.05 to 1 mass %, Mg: 0.01 to 0.3 mass %, Si: 0.05 to 1 mass % and Ti: 0.01 to 0.5 mass %.
摘要:
An electrophotographic photosensitive member production process is provided having the steps of placing a cylindrical substrate having a conductive surface in a first film-forming chamber, and decomposing a source gas with high-frequency power to deposit on the cylindrical substrate a first layer formed of a non-single-crystal material, taking out of the first film-forming chamber the cylindrical substrate with the first layer deposited thereon, and placing the cylindrical substrate with the first layer deposited thereon in a second film-forming chamber, and decomposing a source gas with a high-frequency power to deposit on the first layer a second layer having an upper-part blocking layer formed of a non-single-crystal material. Even where abnormal growth portions called spherical protuberances are present on the photosensitive member surface, they can be made not to appear on images, and image defects can vastly be remedied.