초록 ▼

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 poly

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.

대표청구항 ▼

An encapsulated semipermeable membrane constructed for ultrafiltration and reverse osmosis, comprising a polymeric substrate and a thin semipermeable film obtained by coating onto the external surface and all accessible internal surfaces of the substrate at least one layer of a cross-linkable hydrop

An encapsulated semipermeable membrane constructed for ultrafiltration and reverse osmosis, comprising a polymeric substrate and a thin semipermeable film obtained by coating onto the external surface and all accessible internal surfaces of the substrate at least one layer of a cross-linkable hydrophilic polymer, and cross-linking the layer with a polyfunctional compound containing at least two functional groups.