Asymmetric composite membranes and hydrophilicitized microporous sheets of polyolefin used in their preparation
US12083780B2 · kind B2 · utility
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Key dates
| Filing date | Oct 1, 2020 |
| Grant date | Sep 10, 2024 |
| Priority date | — |
| Expiry date | May 25, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2307/728
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Composite membranes having a film of poly(ethenol) (polyvinyl alcohol; PVA) adhered to a microporous sheet of polyolefin are disclosed. The microporous sheet is made hydrophilic by grafting of the polyolefin, e.g. poly(ethylene), with a preformed polymer before adherence of the film of PVA. The composite membranes are chlorine tolerant with high levels of protein rejection making them particularly suitable for use in the extraction or recovery of water from feed streams in the beverage and food industries, including dairy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.