Semipermeable membranes based on polymers containing sulphonate group
AssigneeStork Friesland B.V.
InventorsHenricus C. W. M. Buys, Aart J. Naaktgeboren, Johan Gons
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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.
Claims17
A thermally-resistant semipermeable separation membrane, consisting essentially of a polymer containing --SO.sub.3 -- groups in a chain thereof, each of said --SO.sub.3 -- groups being connected directly and exclusively to an aryl group having at least 6 carbon atoms.
Dependencies are inferred from the claim text.