Process for the preparation of an aqueous emulsion of a midblock sulfonated block copolymer
US9988500B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2015 |
| Grant date | Jun 5, 2018 |
| Priority date | — |
| Expiry date | Apr 1, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2353/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention concerns aqueous emulsions and a process for preparing aqueous emulsions of a midblock sulfonated styrenic block copolymer comprising at least two non-sulfonated polymer end-blocks A and at least one sulfonated block B, comprising the steps of providing a cement of a midblock sulfonated styrenic block copolymer in the apolar solvent, mixing the cement with a co-solvent to form a mixture, emulsifying the mixture in the absence of a surfactant with water to produce an emulsion, and removing the hydrocarbon solvent and any optional co-solvent from the emulsion to produce the aqueous emulsion. The resulting emulsion of the midblock sulfonated styrenic block copolymer has relatively small particle diameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.