Charging component for electrophotographic process containing a protective layer of conductive carbon black particles in polyether-ester-amide block copolymer
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United States of America Patent
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Aug 30, 1994
Grant Date -
N/A
app pub date -
Feb 3, 1993
filing date -
Feb 3, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A direct contact type charging component for use in electrophotographic process containing a protective surface layer which comprises a polyether-ester-amide block copolymer. The copolymer is environmentally stably having a volume resistivity between 10.sup.6 Ohm-cm and 10.sup.12 Ohm-cm and a Shore hardness between Shore D 5 and Shore D 90. During the electrophotographic process, a voltage is applied externally to the charging component to cause a charged component, which typically comprises a photo-conductive drum, to become electrostatically charged. In the preferred embodiment, the voltage consists of a direct voltage of .+-.200 to .+-.2,000 V overlapped with an alternating voltage having a peak-to-peak voltage of 4,000 V.
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