Electrophotographic conductive roller, process cartridge, and electrophotographic image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKazuaki Nagaoka, Atsushi Noguchi, Yoshitaka Suzumura, Yuki Nasuno
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Abstract
An electrophotographic conductive roller including, in this order, a conductive substrate, an ion-conductive elastic layer, and a surface layer, the surface layer includes a resin and carbon black, and the carbon black in the surface layer has an arithmetic mean Rc of circle-equivalent diameters of 60.0 nm or less and a σc/Rc of 0.000 to 0.650, where σc (nm) is a standard deviation of the circle-equivalent diameter. The carbon black in the surface layer has an arithmetic mean d of inter-wall distances of 80.0 to 150.0 nm and a σd/d of 0.000 to 0.600, where σd (nm) is a standard deviation of inter-wall distances.
Claims7
An electrophotographic conductive roller comprising, in this order, a conductive substrate, an ion-conductive elastic layer, and a surface layer,
- the surface layer comprising a resin and carbon black;
- the carbon black in the surface layer having an arithmetic mean Rc of circle-equivalent diameters of 60.0 nm or less and a σc/Rc of 0.000 to 0.650, where σc (nm) is a standard deviation of the circle-equivalent diameters;
- and
- the carbon black in the surface layer having an arithmetic mean d of inter-wall distances of 80.0 to 150.0 nm and a σd/d of 0.000 to 0.600, where σd (nm) is a standard deviation of the inter-wall distances.
Dependencies are inferred from the claim text.