Process for brominating butadiene/vinyl aromatic copolymers
US8114943B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Aug 14, 2007 |
| Grant date | Feb 14, 2012 |
| Priority date | — |
| Expiry date | Apr 26, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Butadiene copolymers are brominated in solution using bromine as the brominating agent. The bromination is conducted in the presence of an excess of an aliphatic alcohol, relative to the amount of bromine that is used. The bromination proceeds rapidly at mild conditions, and is selective in that only aliphatic carbon-carbon double bonds are brominated, and unwanted bromination at tertiary carbon atoms is largely or completely avoided. The resulting brominated polymers are characterized in having very good thermal stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.