Charging component for electrophotographic process containing a protective layer of conductive carbon black particles in polyether-ester-amide block copolymer
US5342717A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1993 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Feb 3, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2495
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.