Terpolymers based on sulfobetaines, processes for their preparation and their use as thickeners for aqueous salt solutions
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United States of America Patent
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Feb 12, 2002
Grant Date -
N/A
app pub date -
Jun 7, 2000
filing date -
Jun 30, 1999
priority date (Note) -
Expired
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Abstract
Terpolymers based on (meth)acrylamide, hydroxyalkyl (meth)acrylate and sulfobetaine monomers and their use as thickeners for aqueous salt solutions are described. The terpolymers display their thickening effect within wide concentration and density ranges of the aqueous salt solutions. In addition, their thermal stability is retained also with respect to salt solutions containing calcium chloride and/or calcium bromide and/or zinc bromide.
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