Asymmetric composite membrane and a method of preparation thereof
US11389771B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | Oct 3, 2016 |
| Grant date | Jul 19, 2022 |
| Priority date | — |
| Expiry date | Jul 13, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Asymmetric composite membranes and methods for their preparation are disclosed. The membranes comprise a cross-linked poly(vinyl alcohol) polymer coated on a film of cross-linked sulfonated poly(ether ether ketone) adhered to a sheet of hydrophilicitized microporous polyolefin. The microporous polyolefin is typically microporous poly(ethylene). The membranes have improved selectivity with the regard to the rejection of solutes in reverse osmosis and ultrafiltration applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.