Halogenated elastomers with Mooney viscosity stability and method for preparing same
US10889704B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2018 |
| Grant date | Jan 12, 2021 |
| Priority date | — |
| Expiry date | Sep 18, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2201/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Methods of improving Mooney stability of a brominated elastomer comprising: neutralizing a brominated elastomer effluent with a neutralizing agent and water to form a neutralized effluent comprising a hydrocarbon solvent; removing the solvent from the neutralized effluent to form a brominated elastomer slurry; and separating a brominated elastomer from the brominated elastomer slurry, wherein a Mooney stabilizer package comprising an amine-functional hindered amine stabilizer (HAS) and an acid scavenger can be added, together or separately, before the removing step are provided herein. The acid scavenger can comprise a protonatable atom with a pKa greater than the pKa of the HAS nitrogen atom. The separated brominated elastomer can have a delta Mooney of not more than about 10 Mooney units after ˜7 days at ˜80° C. Stabilized brominated elastomer compositions can be made using this method, and articles can be made from those compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.