Removal of catalyst from polyphenylene oxide reaction mixtures with nitrogenous salts of nitrilotriacetic acid
US4039510A · kind A · utility
10Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1975 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Dec 8, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A novel process is disclosed for the removal of catalyst residues from organic solutions of polyphenylene oxides. The process comprises adding a nitrogenous salt of nitrilotriacetic acid to a polyphenylene oxide reaction mixture and thereafter adding an antisolvent for polyphenylene oxide to the mixture to cause the polyphenylene oxide to precipitate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.