Process of preparing polymer sulphonyl derivatives
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United States of America Patent
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Jun 2, 1992
Grant Date -
N/A
app pub date -
Jul 24, 1989
filing date -
Jul 28, 1988
priority date (Note) -
Expired
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Abstract
A process for making a polymer carrying a plurality of pendant groups SO.sub.2 Z' (where Z' is halogen) comprises reacting with an inorganic acid halide a substantially water-insoluble derivative of the corresponding polymer sulphonic acid with cations of valency 2, 3 or 4. The process is especially useful when the polymer sulphonic acid is one which in free acid form or monovalent cation salt form is soluble in or heavily swollen by water at temperatures in the range 0.degree.-30.degree. C. Suitably the polymer sulphonic acid is derived from a polyarylether-sulphone or -ketone or -sulphone/-ketone copolymer containing dioxyphenylene groups.
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