US3787361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of poly-phenylene oxide compounds
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1972-07-07
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Granted: 1974-01-22
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Expires: 1992-07-07
Abstract
Abstract A PROCESS IS PROVIDED IN WHICH POLYPHENYLENE OXIDE POLYMER ARE READILY PREPARED IN HIGH YIELDS BY OXIDATIVE POLYMERIZATION OF PHENOLS WITH OXYGEN IN THE PRESENCE OF A NOVEL TERNARY CATALYST SYSTEM COMPOSED OF A MANGANESE COMPOUND, A PRIMARY AMINE, AND AN ALCOHOL. COMPARED WITH POLYMERS OBTAINED WITH KNOWN CATALYSTS, THE PRESENT POLYMER HAS NARROWER MOLECULAR WEIGHT DISTRIBUTION AND IS THERMALLY MORE STABLE AND MORE RESISTANT TO OXIDATION SO THAT NO SPECIAL STABILIZING TREATMENT IS NECESSARY. THE POLYMER SHOWS IMPROVEMENT IS CREEP RESISTANCE, DIMENSIONAL STABILITY, ENVIROMENTAL STRESS CRACKING, ECT.
Inventors
- 👤 T Maruyama
- 👤 T Seto
- 👤 S Nakashio
- 👤 T Takemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:09
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 |