Rigid fire retardant polyurethane foam
Abstract
Abstract A RIGID FIRE RETARDANT POLYURETHANE FOAM HAVING GOOD DIMENSIONAL STABILITY, MORE THAN 90% CLOSED CELLS AND A K FACTOR LESS THAN 0.13 IS PRODUCED BY REACTING WITH A POLYOL BLEND CONTAINING A SUCROSE POLYOL WHICH IS THE REACTION PRODUCT OF 8 TO 12 MOLS OF PROPYLENE OXIDE PER MOL OF SUCROSE OR A SUCROSE POLYOL WHICH IS THE REACTION PRODUCT OF 9 TO 12 MOLS OF PROPYLENE OXIDE PERMOL OD SUCROSE AN ISOCYANATO TERMINATED PREPOLYMER FORMED BY REACTING AN EXCESS OF A POLYMETHYLENE POLYPHENYL ISOCYANATE WITH A PHOSPHOURS-CONTANING POLYOL IN THE PRESENCE OF A BLOWING AGENT, SURFACTANT AND A CATALYST OF URETHANE FORMATION. THE RIGID FINE RETARDANT POLYURETHANE FOAMS THUS FORMED ARE PARTICULARY USEFUL FOR INSULATION PURPOSES.
Inventors
- 👤 G Speranza
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |