Production of partially carbonized polymeric fibrous material having an electrical resistivity of enhanced stability

Abstract From the Canadian patent

Abstract of the Disclosure, Partially carbonized polymeric fibrous materials heretofore available have been observed to exhibit unstable resistivity values upon exposure to ambient conditions with such values substantially increasing upon the passage of time. In accordance with the concept of the present invention the previously prepared partially carbonized polymeric fibrous materials are subjected to heating at a temperature of approximately 180 to 450°C (preferably approximately 240 to 360°C.) in an atmosphere containing molecular oxygen for an extended period of time so that the quantity of bound oxygen present in the fibrous material is substantially increased the, electrical …