US3990900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric phosphazenes
Assignee: FMC Corp
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Filing: 1974-02-14
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Granted: 1976-11-09
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Expires: 1994-02-14
Abstract
Abstract A novel process consisting of reacting a phosphonitrilic chloride with an alcohol or alkoxide to 12 carbon atoms to produce a partially esterified phosphonitrilic chloride, removing impurities from the chloroester and heating the ester to form a condensed polymeric phosphazene with P-O-P oxygen linkages. This new class of polymer phosphazenes, with P-O-P oxygen linkages, is unusually efficacious in rendering rayon flame-retardant.
Inventors
- 👤 Borivoj Richard Franko-Filipasic
- 👤 Edward Francis Orwoll
- 👤 John Francis Start
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:47
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; C; C08; C08G; C08G79/00; C08G79/02; C08G79/025; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/667; D06M15/673
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
Regenerated cellulose filaments and filamentary articles containing a flame retardant amount of a polymeric phosphazene normally liquid at room temperature and produced by a process comprising (1) reacting a phosphonitrilic chloride with a metallic alkoxide or an alkyl alcohol in the presence of an acid acceptor, the alkyl portion of the alcohol or alkoxide being a radical of 1 to 12 carbon atoms, to produce a chlorinated phosphazene ester containing 1 to 15% unreacted chlorine by weight based on the weight of the chloroester, (2) heating the chloroester for 5 minutes to 12 hours at a temperature of about 130° to about 220° C to produce a condensed polymeric phosphazene ester of increased molecular weight.
Claim 2
Dependent Claim
115 words
Regenerated cellulose filaments and filamentary articles containing a flame retardant amount of a polymeric phosphazene normally liquid at room temperature and produced by a process comprising (1) reacting a phosphonitrilic chloride with a metallic alkoxide or an alkyl alcohol in the presence of an acid acceptor, the alkyl portion of the alcohol or alkoxide being a radical of 1 to 12 carbon atoms, to produce a chlorinated phosphazene ester containing 1 to 15% unreacted chlorine by weight based on the weight of the chloroester, (2) heating the chloroester for 5 minutes to 12 hours at a temperature of about 130° to about 220° C to produce a condensed polymeric phosphazene ester of increased molecular weight.
Claim 3
Dependent Claim
25 words
The product of claim 1 wherein there is present from 2 to 18% by weight of said phosphazene based on the weight of the filament.
Claim 4
Dependent Claim
16 words
The product of claim 1 in which the phosphonitrilic chloride is a mixture of linear polymers.
Claim 5
Dependent Claim
16 words
The product of claim 1 in which the phosphonitrilic chloride is a mixture of cyclic polymers.
Claim 6
Dependent Claim
18 words
The product of claim 1 in which the phosphonitrilic chloride is a mixture of cyclic and linear polymers.
Claim 7
Dependent Claim
34 words
The product of claim 1 in which the chloroester is heated at a subatmospheric pressure less than 760 mm of mercury to about 5 mm of mercury to facilitate removal of by-product alkyl chloride.
Claim 8
Dependent Claim
19 words
The product of claim 1 in which the phosphonitrilic chloride is added to the alkoxide to produce the chloroester.
Claim 9
Dependent Claim
19 words
The product of claim 1 in which the alkoxide is added to the phosphonitrilic chloride to produce the chloroester.
References Cited (Backward Citations)
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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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |