US4035442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester filaments flame retarded with end-capped poly(m-phenylene cyclohexylphosphonate)
Assignee: EIDP Inc
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Filing: 1976-05-20
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Granted: 1977-07-12
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Expires: 1996-05-20
Abstract
Abstract Polyester filaments having improved flame retardant properties are prepared by a process in which a poly(m-phenylene cyclohexylphosphonate) compound is melted, is mixed with molten polyester, and the melt blend is forwarded to a spinning pack and is melt-spun into filaments. The compound is end-capped with p-phenylphenol or p-bromophenol to avoid reaction with the molten polyester.
Inventors
- 👤 William P. Dunworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:19
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/88; D01F6/92; C; C08; C08G; C08G79/00; C08G79/02; C08G79/04; C08L; C08L67/00; C08L67/02; D01F1/00; D01F1/02; D01F1/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
In the process of producing polyester textile filaments by pumping molten ethylene terephthalate polymer to a spinning pack and extruding the molten polymer to form filaments, the improvement for preparing flame retardant filaments which comprises melting and mixing with the molten polymer a polyphosphonate compound represented by the formula, ##STR3## wherein Ar is ##STR4## ##STR5## represents cyclohexyl, and n is an integer between 1 and 20, forwarding the resulting melt blend to the spinning pack and extruding the melt blend into filaments, an amount of polyphosphonate compound being added which provides 0.1 to 2 percent phosphorus by weight in the filaments.
Claim 2
Dependent Claim
101 words
In the process of producing polyester textile filaments by pumping molten ethylene terephthalate polymer to a spinning pack and extruding the molten polymer to form filaments, the improvement for preparing flame retardant filaments which comprises melting and mixing with the molten polymer a polyphosphonate compound represented by the formula, ##STR3## wherein Ar is ##STR4## ##STR5## represents cyclohexyl, and n is an integer between 1 and 20, forwarding the resulting melt blend to the spinning pack and extruding the melt blend into filaments, an amount of polyphosphonate compound being added which provides 0.1 to 2 percent phosphorus by weight in the filaments.
Claim 3
Dependent Claim
27 words
A process as defined in claim 1 wherein an amount of polyphosphonate compound is added which provides 0.3 to 1.0 percent phosphorus by weight in the filaments.
Claim 4
Dependent Claim
22 words
A process as defined in claim 1 wherein Ar is a p-diphenyl group and n is an integer from 5 to 15.
Claim 5
Dependent Claim
37 words
Flame retardant polyester articles containing about 1 to 16 percent by weight of a polyphosphonate compound represented by the formula, ##STR6## wherein Ar is ##STR7## ##STR8## represents cyclohexyl, and n is an integer from 5 to 15.
Claim 6
Dependent Claim
37 words
Flame retardant polyester articles containing about 1 to 16 percent by weight of a polyphosphonate compound represented by the formula, ##STR6## wherein Ar is ##STR7## ##STR8## represents cyclohexyl, and n is an integer from 5 to 15.
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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |