Electrically-conductive member and image forming apparatus using

Details Electrically-conductive member and image forming apparatus using Electrically-conductive member and image forming apparatus using

1997-12-22

1999-12-21

Nakarani, D. S.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

399115, 399116, 399122, 428 3691, 428336, 4284233, 4284239, 4284244, 4284247, 4284248, 4284258, 492 48, 492 53, B32B 2740, G03G 1502, G03G 1516

Patent

active

060046694

ABSTRACT:
The present invention provides an electrostatic charging member excellent in dispersibility of electrically-conducting agent and uniformity in resistance which causes no contamination of the material to be charged for a prolonged period of time. The present invention relates to an electrostatic charging member which electrostatically charging uniformly the surface of a material to be charged such as photoreceptor and dielectric material while pressing the material. An electrostatic charging member 1 has a two-layer structure comprising an electrically-conductive elastic material layer 1b formed on an electrically-conductive substrate 1a, and a resistance-controlling layer 1c covering the elastic material layer 1b. The resistance-controlling layer 1c comprises an electrically-conducting agent such as carbon black having a pH value of not more than 6 dispersed in an amine-modified polyurethane resin as a base polymer. The amine-modified polyurethane resin preferably comprises an amine component incorporated therein in an amount of from 0.02 to 1.0 mmol per g of the resin. The thickness of the resistance-controlling layer 1c preferably falls within the range of from 1 to 50 .mu.m.

REFERENCES:
patent: 5567494 (1996-10-01), Ageishi et al.

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