Semipermeable encapsulated membranes, process for their manufacture and their use
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United States of America Patent
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Oct 18, 1988
Issued Date -
N/A
app pub date -
Aug 18, 1986
filing date -
Dec 27, 1982
priority date (Note) -
Expired
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Abstract
Semipermeable membranes of a porous polymeric substrate whose external and all internal surfaces (pores) are encapsulated by a semipermeable thin film of a hydrophilic polymer are provided. The encapsulating film consists of at least one layer of said polymer which is cross-linked/stabilized by polyfunctional compounds containing at least two functional (reactive) groups. The membrane substrate is optionally pretreated--before the encapsulation step--with polyfunctional compounds. The new membranes can be used in ultrafiltration and reverse osmosis processes. They are solvent-, pressure- and temperature-resistant and show good separation capacities, e.g. for separating organic compounds from salt solutions.
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