REVERSE OSMOSIS OR NANOFILTRATION MEMBRANES AND METHOD FOR PRODUCTION THEREOF
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United States of America Patent
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Issued Date -
Jun 2, 2016
app pub date -
Nov 25, 2015
filing date -
Nov 25, 2015
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Abstract
Reverse osmosis or nanofiltration membranes having a substrate on which a porous supporting layer is arranged, on which supporting layer a separation-active layer is arranged, on which separation-active layer a cover layer is arranged, wherein the separation-active layer comprises polyamide with acid chloride groups on the surface of the separation-active layer, and wherein the cover layer comprises a polymer containing functional groups, and the functional groups of the cover layer are coupled in a chemically reactive manner with the acid chloride groups of the polyamide of the separation-active layer. Embodiments are also directed to a method in which at least one cover layer is applied to the separation-active layer of polyamide immediately thereafter.
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