US3666712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant polymethyl methacrylate compositions
Assignee: Stauffer Chemical Co
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Filing: 1970-04-06
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Granted: 1972-05-30
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Expires: 1990-04-06
Abstract
Abstract Self-extinguishing homo- and copolymers of methyl methacrylate (MMA) are prepared by the intimate admixture of the latter polymers with a specified 2,3-dibromopropyl acid phosphate ester. The thus treated polymers display a high degree of flame retardance without any diminution of their clarity or hardness and they may be safely employed in any application requiring their possible exposure to fire.
Inventors
- 👤 Edward D Weil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:20
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/091; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
A flame retardant composition comprising an intimate mixture of a polymer of methyl methacrylate and as a flame retardant additive bis(2,3-dibromopropyl acid pyrophosphate.
Claim 2
Dependent Claim
24 words
A flame retardant composition comprising an intimate mixture of a polymer of methyl methacrylate and as a flame retardant additive 2,3-dibromopropyl methyl acid phosphate.
Claim 3
Dependent Claim
90 words
A flame retardant composition comprising an intimate mixture of a polymer of methyl methacrylate and as a flame retardant additive (a) a mixture of mono-2,3-dibromopropyl acid phosphate and 2,3-dibromopropyl methyl acid phosphate, said mixture comprising at least about 30 mole percent of said additive with the balance of said additive comprising (b) a mixture of mono-and dimethyl acid phosphate and bis(2,3-dibromopropyl) acid phosphate; said additive comprising the product resulting from the reaction between about 1.8 moles of methanol, about 1.2 moles of 2,3-dibromopropanol and about 1.0 mole of phosphorus pentoxide.
Claim 4
Dependent Claim
68 words
A flame retardant composition comprising an intimate mixture of a polymer of methyl methacrylate and as a flame retardant additive a mixture of: (a) mono-2,3-dibromopropyl acid phosphate (b) 2,3-dibromopropyl methyl acid phosphate (c) mono-methyl acid phosphate and (d) bis(2,3-dibromopropyl) acid phosphate said mixture being the product resulting from the reaction between about 1.0 mole of methanol, about 2.0 moles of 2,3-dibromopropanol and about 1.0 mole of phosphorus pentoxide.
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |