Method of separating superabsorbent polymer particles from a solidified thermoplastic composition comprising polymers
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United States of America Patent
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Aug 28, 2012
Grant Date -
Aug 25, 2011
app pub date -
Feb 25, 2011
filing date -
Feb 25, 2010
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Abstract
A method for re-mobilizing superabsorbent polymer particles which have previously been immobilized by a solidified thermoplastic composition comprising at least 30 weight-% of a thermoplastic polymer. The superabsorbent polymer particles are separated from the solidified thermoplastic composition by using a supercritical fluid comprising carbon dioxide, propane, or mixtures thereof. Separation may be further improved by the use of one or more co-solvents.
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