Compositions – Electrically conductive or emissive compositions – Elemental carbon containing
Patent
1985-05-28
1986-12-30
Barr, Josephine L.
Compositions
Electrically conductive or emissive compositions
Elemental carbon containing
252506, 252507, 423449, 423454, 423458, 556465, 556478, H01B 104
Patent
active
046327754
ABSTRACT:
An improved procedure is provided for increasing the electrical conductivity of graphite via intercalation. It has been found that sulfur trioxide has the ability to substantially aid the intercalation of graphite by previously known intercalants such as (a) fluorosulfonic acid, chlorosulfonic acid, or mixtures thereof, (b) a boron trihalide, a tetrahalide of a Group IV element, a pentahalide of a Group V element, or mixtures thereof, and (c) mixtures of (a) and (b). Such presence of sulfur trioxide during the graphite intercalation reaction has been found to expedite the rate at which intercalation takes place and possibly enables the achievement of a greater electrical conductivity than would have otherwise been obtained. In a preferred embodiment the graphitic carbon is present within a carbonaceous fibrous material at the time of its intercalation and the resulting product is substantially electrically oriented along the axis of the fiber.
REFERENCES:
patent: 3925495 (1975-12-01), Rodewald
patent: 3984352 (1976-10-01), Rodewald
patent: 4388227 (1983-06-01), Kalnin
Breckenridge, Jr. George J.
Goldberg Harris A.
Kalnin Ilmar L.
Barr Josephine L.
Celanese Corporation
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