Halogen recovery with K+-containing oxidant in a process for halogenating unsaturated isoolefin copolymer
US11965053B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2021 |
| Grant date | Apr 23, 2024 |
| Priority date | — |
| Expiry date | Dec 10, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing a halogenated isoolefin copolymer involves contacting an unsaturated isoolefin copolymer cement, the cement comprising an unsaturated isoolefin copolymer dissolved in an organic solvent, under halogenation conditions with a halogenating agent and an aqueous solution of a potassium salt-based oxidant to form a two-phase reaction medium comprising an organic phase and an aqueous phase, the oxidant capable of converting hydrogen halide to free halogen. The process provides improved halogen recovery, is less sensitive to the presence of water, and makes use of more stable and less environmentally damaging oxidants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.