Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Patent
1985-10-11
1989-03-28
Clingman, A. Lionel
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
4234471, D01F 912
Patent
active
048162426
ABSTRACT:
Partially carbonized polymeric fibrous materials heretofore available have been observed to exhibit unstable electrical 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 (as described) are subjected to heating at a temperature of approximately 180.degree. to 450.degree. C. (preferably approximately 240.degree. to 360.degree. C.) in an atmosphere containing molecular oxygen for an extended period of time (as described) wherein the quantity of bound oxygen present therein is substantially increased, the electrical resistivity is increased, and the stability of the resulting electrical resistivity is substantially enhanced. The resulting partially carbonized polymeric fibrous material is particularly suited for use in applications where it serves as an electrostatic charge dissipater or as shielding for electromagnetic radiation.
REFERENCES:
patent: 3745104 (1973-07-01), Hou
patent: 3961888 (1976-06-01), Riggs
patent: 4251589 (1981-02-01), Romaniec
patent: 4285831 (1981-08-01), Yoshida et al.
Ko Yoon S.
Venner Jozef G.
BASF - Aktiengesellschaft
Clingman A. Lionel
McNally John F.
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