CONDUCTIVE POLYMER HAVING IMPROVED ELECTRICAL LIFE
Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
The electrical characteristics of conductive polymers can be controlled by various methods. In one method described in U.S. Patent 3,959,574, an ionic additive (such as organic dyes, organic pigments, organic salts, polyelectolytes, inorganic salts, plasticizers, inorganic pigments, metallic particles and charge transfer complexes) is incorporated in the polymer to control the resistivity. In another method described in U.S. Patent 4,116,894, the electrical life of certain copolymers having solubilized conductivity control agents incorporated therein is enhanced by varying specified quantities of terminally unsaturated hydrocarbon nitriles in the co-polymers. For example, a butadiene copolymer having from about 1% by weight to about 12% by weight acrylonitrile in the copolymer composition in the presence of a conductivity control agent has improved electrical life and polymer stability. However, after a conductive polymer is subjected to continuous electrical use, the resistivity of the polymer increases especially when ionic additives are used as conductivity control agents. This presumably occurs because of the depletion of ionic charge carriers.