Patent US3755214A successfully refreshed from Google Patents.
US3755214A
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Thiophene condensates as flame retardants for polyurethane foam
Assignee: Arkema Inc
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Filing: 1971-11-12
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Granted: 1973-08-28
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Expires: 1991-11-12
Abstract
Abstract Condensation products obtained by reacting thiophene with aldehydes or ketones react with bromine or chlorine under relatively mild conditions. The novel products are effective flame retardants for synthetic polymers, particularly polyurethane foams.
Inventors
- 👤 E Sukman
- 👤 I Touval
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:26
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/45; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/26; C07D333/28; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
13 words
The flame-retardant polymer composition of claim 1 wherein the polymer is a polyurethane.
Claim 2
Dependent Claim
35 words
The flame-retardant polymer composition of claim 1 wherein R1 and R2 are independently selected from the group consisting of alkyl radicals containing between 1 and 4 carbon atoms, inclusive and X represents a bromine atom.
Claim 3
Dependent Claim
13 words
The flame-retardant polymer composition of claim 1 wherein R3 contains 5 carbon atoms.
Claim 4
Dependent Claim
15 words
A halogenated thiophene condensation product exhibiting a general formula selected from the group consisting of:
Claim 5
Dependent Claim
37 words
A halogenated thiophene-condensation product as described in claim 5 wherein R1 and R2 are independently selected from the group consisting of alkyl radicals containing between 1 and 4 carbon atoms, inclusive, and X represents a bromine atom.
Claim 6
Dependent Claim
21 words
A halogenated thiophene-condensation product as described in claim 5 wherein R3 contains 5 carbon atoms and X represents a bromine atom.
Claim 7
Dependent Claim
43 words
A flame-retardant polymer composition containing between 20 and 50 percent by weight of a compound which is the reaction product of the thiophene derivative of claim 1 with a trialkyl phosphite, said compound containing up to about 5 percent by weight of phosphorus.
Claim 8
Dependent Claim
34 words
A halogenated thiophene derivative which is the reaction product of the condensation product of claim 5 with a trialkyl or triaryl phosphite, said derivative containing up to about 5 percent by weight of phosphorus.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |