Method of making amide-imide resins,aromatic amides and aromatic polyamide resins
Abstract
Abstract A METHOD OF MAKING ESSENTIALLY TOTALLY IMIDIZED POLYAMIDE-IMIDE RESINS, AROMATIC AMIDES, AND OTHER AROMATIC POLYAMIDE RESINS WHICH CAN BE APPLIED TO ARTICLES WITHOUT THE RESINS UNDERGOING SUBSTANTIAL CHEMICAL CHANGE AS THE RESINS ARE BEING APPLIED, AND INTERMEDIATES FORMED DURING THE PERFORMANCE OF THE METHOD. SPECIFIC POLYAMIDE-IMIDE RESINS WHICH CAN BE MADE IN ACCORDANCE WITH THE METHOD OF THE INVENTION ARE THOSE DERIVED FROM TRICARBOXYLIC ACIDS OR ANHYDRIDES THEREOF, SUCH AS TRIMELLITIC ACID OR TRIMELLITIC ACID ANHYDRIDE, AND A DIISOCYANATE, SUCH AS P,P''-DIPHENYL METHANE DIISOCYANATE. THE METHOD COMPRISES AN INITIAL REACTION UNDER MILD CONDITIONS AND A SUBSEQUENT REACTION UNDER MORE SEVERE CONDITIONS.
Inventors
- 👤 E Koerner
- 👤 W Wareham
- 👤 D Disque
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |