Films of polyamide-imides having a uniplanar axial structure
Abstract
Abstract POLYAMIDE-IMIDE FILMS HAVING A HIGH ELONGATION AT BREAK, AND SUITABLE FOR INSULATING ELECTRICAL CONDUCTORS WHICH ARE TO BE SUBJECTED TO STRESS, ARE MADE FROM POLYAMIDE-IMIDES COMPRISING STRUCTURAL UNITS OF FORMULA: -(CO-R<(-CO-)2>N-Q-NH)- IN WHICH R IS A TRIVALENT ORGANIC RADICAL CONTAINING AT LEAST TWO CARBON ATOMS AND Q IS A DIVALENT RADICAL CONTAINING AT LEAST ONE BENZENE NUCLEUS, AND ARE CHARACTERIZED BY A UNIPLANAR AXIAL STRUCTURE. THEY CAN BE MADE BY GIVING A FILM OF THE POLYAMIDEIMIDE A TREATMENT IN WHICH (A) IT IS STRETCHED AT 100*350* C. WHILE IT CONTAINS AT LAST 1%, PREFERABLY 5-30%, OF SOLVENT AND (B) IT IS THEN GIVEN A SUPPLEMENTARY HEAT TREATMENT AT 100*-350* C., WHILE PREVENTING SHRINKAGE IN ANY PLANAR DIRECTION THROUGHOUT THE TREATMENT.
Inventors
- 👤 J Gattus
- 👤 M Mallet
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |