US4083818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant polymers
Assignee: Albemarle Corp
•
Filing: 1975-09-29
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Granted: 1978-04-11
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Expires: 1995-09-29
Abstract
Abstract Compounds such as methylbis(2,4,6-tribromophenyl)phosphonate and phenylbis(2,4,6-tribromophenyl)phosphonate are useful as flame retardants for organic polymers and resins such as polyurethane foams, polyesters, and polystyrene.
Inventors
- 👤 David R. Brackenridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5337; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
20 words
A fire retardant organic polymer or resin having incorporated therein a small but fire retardant effective amount of bis(2,4,6-tribromophenyl) methylphosphonate.
Claim 2
Dependent Claim
20 words
A fire retardant organic polymer or resin having incorporated therein a small but fire retardant effective amount of bis(2,4,6-tribromophenyl) methylphosphonate.
Claim 3
Dependent Claim
11 words
A composition of claim 1 wherein the organic polymer is polystyrene.
Claim 4
Dependent Claim
30 words
A polyurethane foam having incorporated therein a flame retardant amount of a phosphonate having the formula ##STR4## wherein R is a hydrocarbyl radical of up to about 8 carbon atoms.
Claim 5
Dependent Claim
30 words
A polyurethane foam having incorporated therein a flame retardant amount of a phosphonate having the formula ##STR4## wherein R is a hydrocarbyl radical of up to about 8 carbon atoms.
Claim 6
Dependent Claim
9 words
A foam of claim 3 wherein R is methyl.
Claim 7
Dependent Claim
9 words
A foam of claim 3 wherein R is phenyl.
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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) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |