Electroconductive elastic spone member and electrostatic image t

Details Electroconductive elastic spone member and electrostatic image t Electroconductive elastic spone member and electrostatic image t

1976-04-19

1978-01-03

Moses, Richard L.

Photocopying

Including fiber optics

96 1TE, 96 14, G03G 1500

Patent

active

040663523

ABSTRACT:
An electrophotographic copying machine of the image transfer type includes a roller for pressing the copy image receiving substrate into virtual contact with the electrostatic image carrying drum. The roller includes a metal shaft and an outer layer formed of an electroconductive elastic sponge material having a resistivity of 10.sup.2 to 10.sup.6 ohm/cm which varies inversely with the compression of the material. The sponge material is produced by soaking an open pore soft polymeric sponge matrix temporarily expandable when exposed to alcohol in a liquid composition containing 10 parts of a water dispersable resin binder, 2 to 7 parts of a fine electroconductive powder and 10 to 200 parts of alcohol, expressing the excess liquid and then drying the liquid composition.

REFERENCES:
patent: 3832055 (1974-08-01), Hamaker
patent: 3860436 (1975-01-01), Meagher
patent: 3866572 (1975-02-01), Gundlach
patent: 3936170 (1976-02-01), Shibano et al.

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