Electroconductive elastic sponge member

Details Electroconductive elastic sponge member Electroconductive elastic sponge member

1974-10-17

1976-08-31

Ansher, Harold

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

355 3R, 427 74, 427 88, 428408, 428425, 219216, B32B 904

Patent

active

039782689

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: 2872340 (1959-02-01), Newman et al.
patent: 2962386 (1960-11-01), Doll et al.
patent: 3721595 (1973-03-01), Tarnopol
patent: 3752695 (1973-08-01), Finelli
patent: 3809603 (1974-05-01), Kooi et al.
patent: 3830656 (1974-08-01), Takenaka et al.

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