Multilayered charge-mosaic membrane and manufacturing method therefor
US9346020B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 27, 2010 |
| Grant date | May 24, 2016 |
| Priority date | — |
| Expiry date | Aug 19, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
There is provided a multilayered charge-mosaic membrane having a porous supporting layer (A), a porous intermediate layer (B) and a charge-mosaic layer (C), wherein the porous supporting layer (A), the porous intermediate layer (B) and the charge-mosaic layer (C) are located in this order; the porous supporting layer (A) and/or the porous intermediate layer (B) are made of a fiber layer containing hydrophilic fibers; a thickness of the porous intermediate layer (B) is 0.1 to 100 μm; a porosity of the porous supporting layer (A) is larger than a porosity of the porous intermediate layer (B); the cationic and/or the anionic polymers constituting the charge-mosaic layer (C) is a polyvinyl alcohol having an ionic group. Thus, there is provided a multilayered charge-mosaic membrane having a large salt permeation flux and excellent mechanical strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.