US4010225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bromine containing telomeric phosphonic acid esters as flame retardant agents
Assignee: Hoechst AG
•
Filing: 1975-09-03
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Granted: 1977-03-01
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Expires: 1995-09-03
Abstract
Abstract Bromine containing telomeric phosphonic acid esters of the formula ##STR1## which are used as flameproofing agent for the preparation of flame-repellent thermoplastic compositions.
Inventors
- 👤 Siegfried Noetzel
- 👤 Horst Jastrow
- 👤 Edgar Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:34
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5337
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A flame-repellent thermoplastic composition comprising a thermoplastic polymer containing a flame repelling amount of a bromine-containing phosphonic acid ester of the formula ##STR3##where R is a lower straight-chain or branched aliphatic hydrocarbon radical having from 1 to 8 carbon atoms; R 1 to R 4 are hydrogen, halogen or lower alkyl having from 1 to 4 carbon atoms; and n is an integer of from 2 to 30.
Claim 2
Dependent Claim
68 words
A flame-repellent thermoplastic composition comprising a thermoplastic polymer containing a flame repelling amount of a bromine-containing phosphonic acid ester of the formula ##STR3##where R is a lower straight-chain or branched aliphatic hydrocarbon radical having from 1 to 8 carbon atoms; R 1 to R 4 are hydrogen, halogen or lower alkyl having from 1 to 4 carbon atoms; and n is an integer of from 2 to 30.
Claim 3
Dependent Claim
31 words
A composition according to claim 1 wherein the amount of bromine-containing phosphonic acid ester is such as to provide said composition with a bromine content of 0.3 to 20% by weight.
Claim 4
Dependent Claim
26 words
A composition according to claim 1 wherein said thermoplastic polymer is selected from polystyrene, copolymers of styrene and acrylonitrile, and copolymers of styrene, butadiene-1,3 and acrylonitrile.
References Cited (Backward Citations)
US3830886A
Cited
US3700760A
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US3787528A
Cited
US3745197A
Cited
US3896187A
Cited
US3925303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |