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US4040843A
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Flame-retardant regenerated cellulose filaments containing oligomeric phosphonitrilic compounds
Assignee: FMC Corp
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Filing: 1976-02-09
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Granted: 1977-08-09
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Expires: 1996-02-09
Abstract
Abstract Regenerated cellulose filaments containing a flame-retardant amount of liquid oligomeric compounds, prepared by heating together liquid polyphosphonitrilic esters with phosphoric anhydride, and method for preparing same.
Inventors
- 👤 Borivoj Richard Franko-Filipasic
- 👤 John Francis Start
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:26
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; C; C08; C08G; C08G79/00; C08G79/02; C08G79/025; C08K; C08K5/00; C08K5/49; C08K5/5399; Y; Y10; Y10S; Y10S428/00; Y10S428/92
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
Regenerated cellulose filaments and filamentary articles, said filaments having dispersed therein a flame-retardant amount of a substantially water-insoluble viscous phosphorus-containing oligomeric flame-retardant fluid made by heating together at a temperature of about 50° to 180° C. for at least 2 hours up to 36 hours (a) phosphoric anhydride with (b) a fluid phosphonitrilic ester having the general formula: ##STR2## in which n is at least 3 and wherein X and Y represent the same or different --OR groups wherein R is an alkyl or alkenyl radical having 1 to 12 carbon atoms, at a mole ratio of 1 mole of (a) to 10 to 20 moles of (b), wherein moles of (b) are based on a monomeric unit of the ester general formula.
Claim 2
Dependent Claim
123 words
Regenerated cellulose filaments and filamentary articles, said filaments having dispersed therein a flame-retardant amount of a substantially water-insoluble viscous phosphorus-containing oligomeric flame-retardant fluid made by heating together at a temperature of about 50° to 180° C. for at least 2 hours up to 36 hours (a) phosphoric anhydride with (b) a fluid phosphonitrilic ester having the general formula: ##STR2## in which n is at least 3 and wherein X and Y represent the same or different --OR groups wherein R is an alkyl or alkenyl radical having 1 to 12 carbon atoms, at a mole ratio of 1 mole of (a) to 10 to 20 moles of (b), wherein moles of (b) are based on a monomeric unit of the ester general formula.
Claim 3
Dependent Claim
12 words
The product of claim 1 in which R has substituent chlorine atoms.
Claim 4
Dependent Claim
23 words
The product of claim 1 containing 1 to 25 % of the viscous oligomeric flame retardant, based on the weight of the cellulose.
Claim 5
Dependent Claim
28 words
The product of claim 1 wherein R is selected from the group consisting of methyl, ethyl, chloroethyl, propyl, isopropyl, butyl, isobutyl, amyl, isoamyl, hexyl, allyl and crotyl radicals.
Claim 6
Independent Claim
132 words
The method of preparing flame-retardant regenerated cellulose filaments which combines mixing viscose and a flame-retardant amount of a substantially water-insoluble viscous phosphorus-containing oligomeric flame-retardant fluid made by heating together at a temperature of about 50° to 180° C. for at least 2 hours up to 36 hours (a) phosphoric anhydride with (b) a fluid phosphonitrilic ester having the general formula: ##STR3## in which n is at least 3 and wherein X and Y represent the same or different --OR groups wherein R is an alkyl or alkenyl radical having 1 to 12 carbon atoms, at a mole ratio of 1 mole of (a) to 10 to 20 moles of (b), wherein moles of (b) are based on a monomeric unit of the ester general formula, and, thereafter, spinning the mixture into filaments.
Claim 7
Independent Claim
132 words
The method of preparing flame-retardant regenerated cellulose filaments which combines mixing viscose and a flame-retardant amount of a substantially water-insoluble viscous phosphorus-containing oligomeric flame-retardant fluid made by heating together at a temperature of about 50° to 180° C. for at least 2 hours up to 36 hours (a) phosphoric anhydride with (b) a fluid phosphonitrilic ester having the general formula: ##STR3## in which n is at least 3 and wherein X and Y represent the same or different --OR groups wherein R is an alkyl or alkenyl radical having 1 to 12 carbon atoms, at a mole ratio of 1 mole of (a) to 10 to 20 moles of (b), wherein moles of (b) are based on a monomeric unit of the ester general formula, and, thereafter, spinning the mixture into filaments.
Claim 8
Dependent Claim
12 words
The method of claim 5 in which R has substituent chlorine atoms.
Claim 9
Dependent Claim
26 words
The method of claim 5 wherein the regenerated cellulose filament contains 1 to 25% of the liquid polymeric phosphazene, based on the weight of the cellulose.
Claim 10
Dependent Claim
28 words
The method of claim 5 wherein R is selected from the group consisting of methyl, ethyl, chloroethyl, propyl, isopropyl, butyl, isobutyl, amyl, isoamyl, hexyl, allyl and crotyl radicals.
Claim 11
Dependent Claim
19 words
The method of claim 5 in which the R radicals are different and one of the radicals is halogenated.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |