Process for treating smectite clays to facilitate exfoliation
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United States of America Patent
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May 4, 2004
Grant Date -
Dec 27, 2001
app pub date -
May 4, 2001
filing date -
Apr 28, 1999
priority date (Note) -
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Abstract
In the method for preparing a nanocomposite by intercalating a smectite clay with a quaternary ammonium ion, and exfoliating the intercalated clay into a polymer matrix; an improvement is disclosed which augments exfoliation. The smectite clay is edge treated with negatively charged organic molecules prior to the exfoliation. For these purposes a high charge density anionic polymer such as a polyacrylate may be used.
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