Use of alkali metal-silica gel (M-SG) materials in solvent and monomer drying and purification for their use in anionic polymerization
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United States of America Patent
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Apr 26, 2011
Grant Date -
Apr 23, 2009
app pub date -
Sep 26, 2008
filing date -
Sep 28, 2007
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Abstract
Stage I Group 1 metal/porous metal oxide compositions or Stage II Group 1 metal/porous metal oxide compositions are shown to be useful to remove impurities and act as drying agents for various types of solvents and for olefinic monomers used in anionic polymerizations. One important advantage of these compositions is their ability to dry simultaneously solvent and monomers, without inducing a significant polymerization of the latter. Another important characteristic is the capacity of the compositions to be totally inactive toward conventional anionic polymerization which allows them to be left in situ during the polymerization itself.
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