Charging roller including a conductive cover layer being formed of a seamless tube, process cartridge and electrophotographic image forming apparatus including such a charging roller
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United States of America Patent
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Aug 3, 2004
Grant Date -
Aug 28, 2003
app pub date -
Feb 20, 2003
filing date -
Feb 21, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a charging roller having a support member and a conductive cover layer, the conductive cover layer is formed of a seamless tube. The seamless tube contains at least (A) a thermoplastic styrene elastomer, (B) a polystyrene resin and (C) a carbon black, and the proportion of the component (A) to the component (B) is (A)/(B)=60/40 to 20/80 in weight ratio. A process cartridge and an electrophotographic apparatus have such a charging roller.
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