Poly (phosphine oxide) flame retardants for polymers
Abstract
Abstract Compounds having the formula WHEREIN R and R1 are, individually, methyl, ethyl or methoxy radicals; AR is benzene, naphthalene or anthracene and when AR is benzene, n and m are, individually whole integers of 0-2, inclusive, x is a whole integer of 2-6, inclusive and R and R1 can combine to form a saturated, six-membered, hydrocarbon ring in conjunction with two adjacent carbon atoms of the benzene ring; when AR is naphthalene, n and m are, individually, whole integers of 0-3, inclusive, and x is a whole integer of 2-4, inclusive; and when AR is anthracene, n and m are, individually, whole integers of 0-4, inclusive, and x is a whole integer of 26, inclusive, and flame-retarded polymers containing the same, are disclosed.
Inventors
- 👤 Joseph Adrian Hoffman
Bibliographic Details
Claims Analysis
Total Claims: 10References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |