US3970635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire retardant polyester fibers
Assignee: Monsanto Co
•
Filing: 1974-01-28
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Granted: 1976-07-20
•
Expires: 1994-01-28
Abstract
Abstract Fire retardant qualities are incorporated into polyester fibers by adding to the polymer, prior to spinning thereof into filaments, not more than about 20 percent, based on the weight of the polymer, of a compound containing two six membered phosphorus-containing heterocyclic rings having carbon, oxygen and phosphorus in the heterocyclic ring.
Inventors
- 👤 Ernest L. Lawton
- 👤 Eugene L. Ringwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:24
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C07F9/65746; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/527; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
The method of imparting fire retardancy to synthetic fibers in which the fiber-forming substance is any long chain synthetic polymer composed of at least 85% by weight of an ester of a dihydric alcohol and terephthalic acid comprising adding to the polymer prior to spinning not more than about 20%, based on the weight of the polymer, of a compound having the general formula: ##SPC4## Wherein R 1 is an alkyl group containing 1-5 carbon atoms; R 2 is a radical selected from the group consisting of H and an alkyl group containing 1-5 carbon atoms; and R 3 is a radical selected from the group consisting of hydrogen or a 1-5 carbon alkyl group.
Claim 2
Independent Claim
115 words
The method of imparting fire retardancy to synthetic fibers in which the fiber-forming substance is any long chain synthetic polymer composed of at least 85% by weight of an ester of a dihydric alcohol and terephthalic acid comprising adding to the polymer prior to spinning not more than about 20%, based on the weight of the polymer, of a compound having the general formula: ##SPC4## Wherein R 1 is an alkyl group containing 1-5 carbon atoms; R 2 is a radical selected from the group consisting of H and an alkyl group containing 1-5 carbon atoms; and R 3 is a radical selected from the group consisting of hydrogen or a 1-5 carbon alkyl group.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said compound is added to the polymer in the amount of 5-15%.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said ester is ethylene terephthalate.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the compound added is: ##SPC5##
Claim 6
Dependent Claim
16 words
The method of claim 4 wherein said compound is added in the amount of about 10%.
Claim 7
Dependent Claim
101 words
A synthetic fiber in which the fiber-forming substance is any long chain synthetic polymer comprising at least 85% by weight of an ester of a dihydric alcohol and terephthalic acid and not more than about 20% based on the weight of the polymer, of a compound having the general formula: ##SPC6## Wherein R 1 is an alkyl group containing 1-5 carbon atoms; R 2 is a radical selected from the group consisting of H and an alkyl group containing 1-5 carbon atoms; and R 3 is a radical selected from the group consisting of hydrogen or a 1-5 carbon alkyl group.
Claim 8
Dependent Claim
101 words
A synthetic fiber in which the fiber-forming substance is any long chain synthetic polymer comprising at least 85% by weight of an ester of a dihydric alcohol and terephthalic acid and not more than about 20% based on the weight of the polymer, of a compound having the general formula: ##SPC6## Wherein R 1 is an alkyl group containing 1-5 carbon atoms; R 2 is a radical selected from the group consisting of H and an alkyl group containing 1-5 carbon atoms; and R 3 is a radical selected from the group consisting of hydrogen or a 1-5 carbon alkyl group.
Claim 9
Dependent Claim
19 words
The fiber of claim 6 wherein said compound is present in the polymer in the amount of about 5-15%.
Claim 10
Dependent Claim
16 words
The fiber of claim 6 wherein the compound is added in the amount of about 10%.
Claim 11
Dependent Claim
16 words
The fiber of claim 6 wherein said compound is present in the amount of about 7%.
Claim 12
Dependent Claim
24 words
The fiber of claim 9 in which at least about 0.8 weight % of phosphorus is retained in the fiber after five detergent washings.
Claim 13
Dependent Claim
11 words
The fiber of claim 6 wherein said ester is ethylene terephthalate.
Claim 14
Dependent Claim
11 words
The fiber of claim 6 in which said compound is: ##SPC7##
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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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |