Sulfonated unhydrogenated copolymers of styrene and butadiene
US5288773A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1992 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Sep 3, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L95/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to polymeric compositions comprising unhydrogenated or substantially unhydrogenated sulfonated copolymers of (poly)styrene and a (poly)conjugated diene, e.g., (poly)butadiene or (poly)isoprene, preferably (poly)butadiene containing less than about 1.0 wt. %, preferably less than about 0.8 wt. % sulfur, preferably from about 0.2 to about 0.7, more preferably from about 0.22 to about 0.6 wt. % sulfur, as well as base-neutralized products thereof. The invention includes the polymeric compositions produced by the process of sulfonating unhydrogenated copolymers of (poly)styrene and a conjugated diene, e.g., (poly)butadiene or (poly)isoprene, preferably (poly)butadiene, which process optionally includes base neutralizing the sulfonated copolymer. This invention further relates to the process for making these novel copolymers comprising combining an unhydrogenated or substantially unhydrogenated copolymer of (poly)styrene and a conjugated diene, e.g., (poly)butadiene or (poly)isoprene, preferably (poly)butadiene and an effective amount of sulfonating agent in an amount for a time, temperature and under conditions sufficient to sulfonate the copolymer and, optionall…
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