Process for making bis-alkylene pyrophosphates
Abstract
Abstract CYCLIC PYROPHOSPHATE COMPOUNDS, HEREIN REFERRED TO AS BIS-ALKYLENE PYROPHOSPHATES, ARE PRODUCED DIRECTLY BY A SIMPLE, ONE-STEP PROCESS WHEREBY PHOSPHORUS PENTOXIDE IS REACTED WITH 2 MOLAR EQUIVALENTS OF AN ALKYLENE OXIDE. REPRESENTIVE ALKYLENE OXIDES ARE ETHYLENE OXIDE, 1,2BUTYLENE OXIDE, 2,3-OCTYLENE OXIDE AND EPIHALOHYDRIN. THE BIS-ALKYLENE PYROPHOSPHATES SO PRODUCED HAVE THE GENERAL FORMULA (-O-R-O-)>P(=O)-O-P<(-O-R-O-)(=O) IN THE ABOVE AS WELL AS SUCCEEDING FORMULAS, R REPRESENTS A VICINAL ALKYLENE OR SUBSTITUTED ALKYLENE GROUP. AMONG OTHER APPLICATIONS, THESE BIS-ALKYLENE PYROPHOSPHATES HAVE UTILITY AS PESTICIDES AND AS ADDITIVES FOR USE IN THE PREPARATION OF FLAME-RESISTANT POLYURETHANE FOAMS.
Inventors
- 👤 Robert S Olson
- 👤 Guy H Harris
- 👤 Robert D Wilcox
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |