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US3787362A
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US
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Preparation of polyphenylene ethers with dialkylformamide promoted copper-amine catalysts
Assignee: General Electric Co
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Filing: 1973-02-14
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Granted: 1974-01-22
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Expires: 1993-02-14
Abstract
Abstract PROCESS FOR THE PREPARATION OF HIGH MOLECULAR WEIGHT POLYPHENYLENE ETHERS BY OXIDATIVELY COUPLING A DI-ORTHOSUBSTITUTED PHENOLIC PRECURSOR IN A REACTION SYSTEM CONTAINING OXYGEN AND A COMPLEX CATALYST FORMED FROM A COPPER SALT AND EITHER A PRIMARY, SECONDARY OR TERTIARY AMINE AND AN ALKYLENE CARBONATE OR A DIALKYL SULFOXIDE PROMOTER OR A PRIMARY OR TERTIARY AMINE AND A DIALKYL FORMAMIDE PROMOTER. USE OF THE PROMOTERS RESULTS IN THE FORMATION OF HIGHER MOLECULAR WEIGHT POLYMER IN A GIVEN REACTION TIME OR POLYMER OF COMPARABLE MOLECULAR WEIGHT IN SUBSTANTIALLY DECREASED REACTION TIME.
Inventors
- 👤 J Bennett
- 👤 A Katchman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:29
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |