Composition production method, and composition
US12410267B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2020 |
| Grant date | Sep 9, 2025 |
| Priority date | — |
| Expiry date | Jul 26, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/34
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for producing a composition including a step A of performing ultrafiltration, microfiltration, dialysis membrane treatment, or a combination thereof on a composition containing water and a fluoropolymer. The fluoropolymer is a polymer having a structural unit M3 derived from a monomer represented by general formula (1): CX2═CY(—CZ2—O—Rf-A) (1) where X is the same or different and is —H or —F; Y is —H, —F, an alkyl group, or a fluorine-containing alkyl group; Z is the same or different and is —H, —F, an alkyl group, or a fluoroalkyl group; Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms or a fluorine-containing alkylene group having 2 to 100 carbon atoms and having an ether bond; and A is —COOM, —SO3M, —OSO3M, or —C(CF3)2OM, wherein M is as defined herein; provided that at least one of X, Y, and Z includes a fluorine atom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.