Polysulphone compositions
Abstract
Abstract A FILM-FORMING COMPOSITION HAVING GOOD HEAT STABILITY WHICH COMPRISES (A) A POLYSULPHONE AND (B) AN IMIDE PERPOLYMER OBTAINED BY REACTING AN N,N''-BIS-IMIDE OF AN UNSATURATED DICARBOXYLIC ACID OF GENERAL FORMULA: (D<(-CO-N(-)-CO-))2-A IN WHICH D REPRESENTS A DIVALENT ORGAINIC RADICAL CONTAINING A CARBON-CARBON DOUBLE BOND AND A REPRESENTS A DIVALENT ORGANIC RADICAL POSSESSING AT LEAST TWO CARBON ATOMS, WITH A DI-PRIMARY DIAMINE OF GENERAL FORMULA H2N-B-NH2 IN WHICH B REPRESENTS A DIVALENT ORGANIC RADICAL POSSESSING NOT MORE THAN 30 CARBON ATOMS, THE QUANTITIES OF BISIMIDE AND OF DIAMINE BEING SUCH THAT THE RATIO NUMBER OF MOLD OF N,N''-BIS-IMIDE NUMBER OF MOLS OF DIAMINE IS BETWEEN 1.1 AND 50.
Inventors
- 👤 M Balme
- 👤 M Gruffaz
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |