Heat-resistant,linear,aromatic copolymers and process for their production
Abstract
Abstract HEAT-RESISTANT, LINEAR, AROMATIC COPOLYMERS CONTAINING THIOETHER GROUPS AND ETHER GROUPS AS POLYMER FORMING CONNECTING LINKS, PRODUCED BY REACTING (A) 0.9-1.1 MOLE OF A MIXTURE OF SODIUM OR POTASSIUM SALTS OF AT LEAST ONE AROMATIC DITHIOL AND ONE AROMATIC DIPHENOL OF THE FORMULAE: 4-(4-(HS-)PHENYL)-X-)THIOPHENOL AND WHERE X IS -CH2-; -C(-CH3)2-; -O-; -S-; -S(=O)-; -S(=O)2-; OR -C(=O)4-(4-(HO-)PHENYL)-X-)PHENOL WITH (B) 1 MOLE OF AN AROMATIC DIHALIDE OF THE FORMULA 1-((4-(HAL-)PHENYL)-Y-),4-HAL-BENZENE WHERE Y IS SULFONYL, DISULFONYL, KETO, DIKETO, AZO, VINYLENE, ALKYL PHOSPHINE OR PERFLUOROETHYL AND HAL STANDS FOR HALOGEN. THE REACTION IS CONDUCTED AT A HIGH TEMPERATURE, WITH OXYGEN EXCLUDED, IN A STRONGLY POLAR, APROTIC SOLVENT.
Inventors
- 👤 Rudolf Gabler
- 👤 Josef Studinka
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |