Binder pitch for an electrode and process for its manufacture
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United States of America Patent
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Jun 9, 1992
Issued Date -
N/A
app pub date -
Jan 16, 1991
filing date -
Mar 24, 1987
priority date (Note) -
Expired
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Abstract
The disclosed bonding pitch for electrodes, having a softening point C.I.A. comprised between 80.degree. C. and 150.degree. C., a concentration of quinoline-insoluble substances higher or equal to 4% by weight, a concentration of .alpha.+.beta. resins comprised between 28 and 40% by weight, and a fixed carbon content determined according to the standard ISO 6998, at least equal to 51% by weight, is characterized by a vitreous transition domain .DELTA.Tg, determined by differential calorimetric analysis, at the most equal to 50.degree. C. In order to produce such a pitch, a pitch having a content of quinoline-insoluble substances lower than 4% by weight is subjected to a treatment by waves having a frequency between 0.9 and 300 GHz. Such treatment makes possible the increase of the carbon content of the pitch while preserving a good affinity to the coke and significantly decreasing its vitreous transitional domain.
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