Partially expanded, free flowing, acid treated graphite flake
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United States of America Patent
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N/A
Issued Date -
Jan 1, 2004
app pub date -
Jun 28, 2002
filing date -
Jun 28, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Partially expanded graphite flake having a specific volume of no more than about 50 cm.sup.3/g, more preferably, about 10-25 cm.sup.3/g has excellent sheet forming properties and is readily moldable to form molded products, such as gaskets. The partially expanded graphite flake may be produced by a low temperature process, in which the flakes are first intercalated with an intercalation solution, then subjected to a low temperature exfoliation of below about 500.degree. C. In an alternative process, the flakes are intercalated with no more than about 40 pph of an intercalation solution (less if the particles are not subjected to a subsequent washing step) and then exfoliated at conventional exfoliation temperatures of about 800.degree. C.
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