Semipermeable membranes based on polymers containing sulphonate group
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United States of America Patent
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Aug 23, 1988
Grant Date -
N/A
app pub date -
Jun 25, 1986
filing date -
Jun 26, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Semipermeable membrane consisting of a polymer, embodying [--SO.sub.3 --] groups; said [--SO.sub.3 --] groups may be present in the continuous polymer chains or may be present in links between continuous polymer chains. The membrane may have been formed either by in situ coagulation of a polymer solution in the pores of a porous substrate or by interfacial crosslinking of a water-soluble phenolic polymer with a sulphonyl halide compound to form an [--SO.sub.3 --] groups embodying polymer in the pores of a substrate.
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