Method for producing expandable graphite intercalation compounds using phosphoric acids, and graphite foil
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United States of America Patent
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Nov 11, 2003
Grant Date -
Aug 30, 2001
app pub date -
Jan 25, 2001
filing date -
Jan 29, 2000
priority date (Note) -
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Abstract
A method for producing expandable graphite intercalation compounds uses a thermal polyphosphoric acid which is added to an intercalation agent or to graphite. Preferably, the thermal polyphosphoric acid is used in a mixture with red, fuming nitric acid. Products produced from the graphite intercalation compounds through the expanded graphite stage, such as graphite foils, graphite laminates or graphite seals, have a comparatively high fluid tightness, are relatively resistant to oxidative attack, and can have comparatively high strengths. A further advantage is a good handling ability of the thermal polyphosphoric acids. A graphite foil is also provided.
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