Phosphino derivatives
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United States of America Patent
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Jun 6, 2000
Grant Date -
N/A
app pub date -
Feb 18, 1998
filing date -
Feb 26, 1997
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Abstract
The reaction of compounds of the formula: X.sub.2 O.sub.3 P CHY CZ.sub.2 where Y and each Z are each H, PO.sub.3 X.sub.2, SO.sub.3 X or CO.sub.2 X (e.g. vinyl phosphonic acid or vinylidene diphosphonic acid) with hypophosphorous acid in the presence of free radicals provides novel compounds X.sub.2 O.sub.3 PCHYCZ.sub.2 PO.sub.2 XH which react with monomers such as vinyl sulphonate, vinyl phosphonate, vinylidene diphosphonate and acrylic acid to form telomers useful for scale inhibition, especially barium scale in oil wells. The polymers show better absorption to rock than PVSA and better thermal stability than random copolymers containing equivalent phosphorus.
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