Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and method for producing electrophotographic photosensitive member
First Claim
Patent Images
1. An electrophotographic photosensitive member comprising:
- a cylindrical support,a conductive layer formed on the cylindrical support, anda photosensitive layer formed on the conductive layer, wherein,the conductive layer comprises;
a metal oxide particle coated with tin oxide doped with niobium or tantalum, anda binder material,Ia and Ib satisfy relations (i) and (ii);
Ia≦
6,000
(i)
10≦
Ib
(ii)where, in the relation (i), Ia [μ
A] is an absolute value of the largest amount of a current flowing through the conductive layer when a test which continuously applies a voltage having only a DC voltage of −
1.0 kV to the conductive layer is performed, and, in the relation (ii), Ib [μ
A] is an absolute value of an amount of a current flowing through the conductive layer when a decrease rate per minute of the current flowing through the conductive layer reaches 1% or less for the first time, andthe conductive layer before the test is performed has a volume resistivity of not less than 1.0×
108 Ω
·
cm and not more than 5.0×
1012 Ω
·
cm.
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Abstract
An electrophotographic photosensitive member in which a leakage hardly occurs, a process cartridge and electrophotographic apparatus having the electrophotographic photosensitive member, and a method for producing the electrophotographic photosensitive member are provided. The conductive layer in the electrophotographic photosensitive member contains metal oxide particle coated with tin oxide doped with niobium or tantalum. The relations: Ia≦6,000 and 10≦Ib are satisfied. The conductive layer before the test is performed has a volume resistivity of not less than 1.0×108 Ω·cm and not more than 5.0×1012 Ω·cm.
28 Citations
18 Claims
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1. An electrophotographic photosensitive member comprising:
-
a cylindrical support, a conductive layer formed on the cylindrical support, and a photosensitive layer formed on the conductive layer, wherein, the conductive layer comprises; a metal oxide particle coated with tin oxide doped with niobium or tantalum, and a binder material, Ia and Ib satisfy relations (i) and (ii);
Ia≦
6,000
(i)
10≦
Ib
(ii)where, in the relation (i), Ia [μ
A] is an absolute value of the largest amount of a current flowing through the conductive layer when a test which continuously applies a voltage having only a DC voltage of −
1.0 kV to the conductive layer is performed, and, in the relation (ii), Ib [μ
A] is an absolute value of an amount of a current flowing through the conductive layer when a decrease rate per minute of the current flowing through the conductive layer reaches 1% or less for the first time, andthe conductive layer before the test is performed has a volume resistivity of not less than 1.0×
108 Ω
·
cm and not more than 5.0×
1012 Ω
·
cm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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-
11. A method for producing an electrophotographic photosensitive member comprising:
-
forming a conductive layer having a volume resistivity of not less than 1.0×
108 Ω
·
cm and not more than 5.0×
1012 Ω
·
cm on a cylindrical support, andforming a photosensitive layer on the conductive layer, wherein, the formation of the conductive layer is preparing a coating solution for a conductive layer using a solvent, a binder material, and metal oxide particle coated with tin oxide doped with niobium or tantalum, and forming the conductive layer using the coating solution for a conductive layer, the metal oxide particle coated with tin oxide doped with niobium or tantalum used for preparation of the coating solution for a conductive layer has a powder resistivity of not less than 1.0×
103 Ω
·
cm and not more than 1.0×
105 Ω
·
cm, andthe mass ratio (P/B) of the metal oxide particle coated with tin oxide doped with niobium or tantalum (P) to the binder material (B) in the coating solution for a conductive layer is not less than 1.5/1.0 and not more than 3.5/1.0. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification