Composite membrane with multi-layered active layer
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United States of America Patent
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Feb 7, 2017
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app pub date -
Jun 7, 2012
filing date -
Jun 7, 2012
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Abstract
A thin film composite membrane includes an active layer on a support membrane, wherein the active layer includes at least two chemically distinct first and second crosslinked polyamide film sub-layers. The first film sub-layer includes a polyamide unit; and the second film sub-layer includes a copolyamide with two chemically distinct polyamide units. The first film sub-layer is closer to the support than is the second film sub-layer.
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