Composite membrane with multi-layered active layer
US9561474B2 · kind B2 · utility
0Cited by
30References
28Claims
0Family size
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Key dates
| Filing date | Jun 7, 2012 |
| Grant date | Feb 7, 2017 |
| Priority date | — |
| Expiry date | Aug 5, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.