Process for terminating polyphenylene ethers reactions with amino carboxylic acids and reducing agents
US4058504A · kind A · utility
17Cited by
5References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 16, 1976 |
| Grant date | Nov 15, 1977 |
| Priority date | — |
| Expiry date | Apr 16, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In the production of polyphenylene ethers by oxidative polycondensation of phenols in the presence of a complex catalyst, an aminocarboxylic acid derivative and a reducing agent are simultaneously added to the reaction mixture when the resulting polyphenylene ether has attained the desired degree of polymerization, thereby to terminate the polymerization and simultaneously purify the reaction mixture. Hence, a stable purified polymer can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.