Patent US3947423A successfully refreshed from Google Patents.
US3947423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters containing bicyclic phosphate flame retardant
Assignee: FMC Corp
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Filing: 1974-05-13
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Granted: 1976-03-30
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Expires: 1994-05-13
Abstract
Abstract A novel compound, bis((1-oxo-2,6,7-trioxa-1-phosphabicyclo[2.2.2]oct-4-yl)methyl) 2,5-dibromoterephthalate, which is a highly effective flame-retardant additive for polyesters, and flame-retardant polyester compositions containing it.
Inventors
- 👤 William A. Hills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/527; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C07F9/65748
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
A flame-retardant polyester composition comprising a linear saturated, fiber-forming polyester and from 5 to 25% by weight of bis-((1-oxo-2,6,7-trioxa-1-phosphabicyclo[2.2.2]-oct-4-yl)methyl)2,5-dibromoterephthalate as the flame retardant additive, based on the combined weight of polyester and said flame-retardant additive.
Claim 2
Dependent Claim
35 words
A flame-retardant polyester composition comprising a linear saturated, fiber-forming polyester and from 5 to 25% by weight of bis-((1-oxo-2,6,7-trioxa-1-phosphabicyclo[2.2.2]-oct-4-yl)methyl)2,5-dibromoterephthalate as the flame retardant additive, based on the combined weight of polyester and said flame-retardant additive.
Claim 3
Dependent Claim
31 words
The composition of claim 1 where there is present from 10 to 22% by weight of the flame-retardant additive, based on the combined weight of said polyester and said flame-retardant additive.
Claim 4
Dependent Claim
9 words
A fiber formed from the composition of claim 1.
Claim 5
Dependent Claim
22 words
The composition of claim 3 wherein the polyester is a member of the group consisting of polyethylene terephthalate, poly(1,4-cyclohexylenedimethylene)terephthalate and polyethylene 2,6-naphthalenedicarboxylate.
Claim 6
Dependent Claim
40 words
A process for preparing the flame-retardant polyester fiber of claim 4 which comprises admixing the flame-retardant additive with molten polyester and thereafter extruding the admixture at elevated temperatures through a spinneret plate whereby a spun, flame-retardant polyester fiber is produced.
References Cited (Backward Citations)
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US3427267A
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US3454672A
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US3658634A
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US3808296A
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US3849368A
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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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |