Polyimide foam thermal insulation and fire protection
Abstract
Abstract IN THE PREPARATION OF POLYAMIDE FOAMS BY THE REACTION OF POLYISOCYANATES AND POLYFUNCTIONAL AROMATIC ACID DERIVATIVES, FLAME RETARDANT FOAMED PRODUCTS OF IMPROVED CELL QUALITY, FRIABILITY, AND RESILIENCY ARE OBTAINED BY CONDUCTING THE REACTION IN THE PRESENCE OF AN ALKANOLAMINE SUCH AS 1-HYDROXYETHYL-2-HEPTADECENYL GLYOXALIDINE. ANOTHER ASPECT OF THE INVENTION RESIDES IN THE FINDING THAT POLYIMIDE FOAMS OF REPRODUCIBLE DENSITY ABOVE 1 LB./ FT.3 AND BELOW 6 LBS./FT.3 CAN BE OBTAINED BY EMPLOYING IN THE REACTION AT LEAST 2% BY WEIGHT OF SILOXANE-GLYCOL COPOLYMERS AS A SURFACTANT WHICH ACTS AS A SPECIFIC DENSITY CONTROL AGENT. A FURTHER FEATURE OF THE INVENTION IS THE PRODUCTION OF POLYIMIDE FOAMS INTO WHICH REINFORCING FIBERS SUCH AS SILICON DIOXIDE AND CARBON FIBERS MAY BE INCORPORATED.
Inventors
- 👤 R Rosser
Bibliographic Details
Claims Analysis
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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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |