Cation exchange membrane and method for producing same
US9833742B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 8, 2015 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Apr 8, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2353/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Provided is a cation exchange membrane having a stable ion exchange performance during usage, being excellent in basic properties such as membrane resistance and ion transportation as well as strength, and useful for electrodialysis and a method for producing the same. The cation exchange membrane is composed of a polyvinyl alcohol copolymer including an anionic group-containing anionic polymer segment and a vinyl alcohol polymer segment, and having a microphase separation structure having a domain size (X) in a range from 0 nm<X≦150 nm. The method is composed of forming a membrane from a polyvinyl alcohol copolymer which is adjusted to contain salts in a proportion that the salt weight (C) relative to the polyvinyl alcohol copolymer weight (P) is [(C)/(P)] of 4.5/95.5 or lower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.