Process for simultaneous production of halomethylphosphonic dihalides,bis-(halomethyl)-phosphinic halides and methylhalomethylphosphinic halides
Abstract
Abstract HALOMETHYPHOSPHONIC DIHALIDES, BIS - (HALOMETHYL) PHOSPHINIC HALIDES AND METHYLHALOMETHYLPHOSPHINIC HALIDES ARE SIMULTANEOUSLY PRODUCED BY REACTING PHOSPHORUS (WHITE), ALKALI METAL HYDROXIDE, WATE AND FORMALDEHYDE IN THE PRESENCE OF A WATER-MISCRIBLE MONOHYDRIC ALCOHOL TO FORM A REACTION MIXTURE COMPRISING ALKALI METAL SALT OF METHYL-HYDROXYMETHYL PHOSPHINIC ACID, ALKALI METAL SALT OF BIS(HYDROXYMETHYL)PHOSPHINIC ACID AND THE DIALKALI METAL SALT OF HYDROXYMETHYL PHOSPHONIC ACID, REMOVING VOLATILE CONSTITUENTS FROM THE REACTION MIXTURE AND TREATING THE ACID SALT REACTION PRODUCTS WITH A HALOGENATING AGENT (E.G. SOCL2) THEREBY TO CONVERT SAID PRODUCTS TO THE CORRESPONDING HALIDE DERIVATIVE. THE HALIDES PRODUCED BY THE PROCESS ARE USEFUL AS FLAME RETARDANTS.
Inventors
- 👤 L Maier
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |