Process for producing chlorinated butyl rubber
US11919977B2 · kind B2 · utility
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21References
24Claims
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Assignee
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Key dates
| Filing date | Dec 12, 2019 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Apr 14, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2810/50
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to an energy efficient, fast and environmentally favourable process for the preparation of chlorinated butyl rubbers, that uses hypochlorous acid (HOCl) and/or dichlorine monoxide (Cl2O) as halogenating agent. The process comprises reacting a copolymer with hypochlorous acid and/or dichlorine oxide. The copolymer comprises units derived from an isoolefin monomer and units derived from a multiolefin monomer. A preferred isoolefin is isobutene and a preferred multiolefin is isoprene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.