Sulphonation process for low crosslinked polystyrene
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United States of America Patent
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Jan 18, 1994
Issued Date -
N/A
app pub date -
Mar 24, 1993
filing date -
Jan 30, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Crosslinked styrenic polymers may be sulphonated in a controlled manner in an organic solvent at elevated temperature using SO.sub.3 in the presence of a trialkyl phosphate. The process does not introduce further crosslinking into the polymer permitting it to have an extremely high water uptake. The resulting polymer is useful as a hydrogel.
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