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US3755230A
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Stabilized polyacrylonitrile compositions with sulfur-phosphorus containing material
Assignee: Celanese Corp
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Filing: 1971-04-22
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Granted: 1973-08-28
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Expires: 1991-04-22
Abstract
Abstract A method of forming stabilized polyacrylonitrile compositions which are particularly suited for the spinning of polyacrylonitrile fibers and films and the compositions produced thereby wherein acrylonitrile polymers containing at least 85 percent acrylonitrile are dissolved in a solvent which is acetonitrile or an acetonitrile - water mixture and which contains as a color stabilizer a compound having the following general formula: WHEREIN R1, R2, and R3 are monovalent organic radicals which may be substituted or unsubstituted independently selected from the group consisting of alkyl, cycloalkyl, aryl, and combinations thereof. Preferably, the solvent and polymer are purged with nitrogen and the pH of the solvent is adjusted to about 6.0 7.0.
Inventors
- 👤 D Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/5398
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
27 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 1 wherein said polyacrylonitrile consists essentially of from about 30 to about 70 percent of said composition.
Claim 2
Dependent Claim
21 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 1 wherein said solvent contains up to about 50 percent water.
Claim 3
Dependent Claim
34 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 1 wherein R1, R2, and R3 of said stabilizer are the same monovalent organic radical selected from the group consisting of alkyl and alkaryl.
Claim 4
Dependent Claim
17 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 1 wherein said stabilizer is trilauryl trithiophosphite.
Claim 5
Dependent Claim
46 words
The stabilized film or fiber forming polyacrylonitrIle composition of claim 1 wherein said solvent contains from about 2 to about 35 percent water and R1, R2, and R3 of said stabilizer are the same monovalent organic radical selected from the group consisting of alkyl and alkaryl.
Claim 6
Dependent Claim
17 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 6 wherein said polyacrylonitrile is a homopolymer.
Claim 7
Dependent Claim
27 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 6 wherein at least one of the ethylenically unsaturated materials copolymerized with acrylonitrile is a sulfur-containing material.
Claim 8
Dependent Claim
26 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 6 wherein at least one of the ethylenically unsaturated materials copolymerized with acrylonitrile is methyl acrylate.
Claim 9
Dependent Claim
91 words
A stabilized film or fiber forming polyacrylonitrile composition useful as a spinning solution for the production of polyacrylonitrile fibers wherein said composition consists essentially of polyacrylonitrile containing at least 85 percent acrylonitrile and up to about 15 weight percent of at least one other ethylenically unsaturated material copolymerized therewith, a solvent consisting essentially of acetonitrile and from about 2 to about 40 percent water, and from about 0.01 to about 3 weight percent, based on the weight of said polyacrylonitrile, of a sulfur- and phosphorous-containing stabilizer having the following general formula:
Claim 10
Dependent Claim
17 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 10 wherein said stabilizer is trilauryl trithiophosphite.
Claim 11
Dependent Claim
36 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 10 wherein said superatmospheric pressure is greater than about the vapor pressure of said solvent at a temperature of from about 80* to about 160* C.
Claim 12
Dependent Claim
108 words
A stabilized film or fiber forming polyacrylonitrile composition consisting essentially of from about 30 to about 70 percent of polyacrylonitrile containing from 85 to about 99 percent acrylonitrile, from about 0 to about 15 percent of an ethylenically unsaturated material copolymerized therewith, and from about 0.1 to about 2 percent of a sulfur-containing ethylenically unsaturated material also copolymerized therewith; from about 29 to about 69 percent of a solvent consisting of acetonitrile and from about 2 to about 40 percent water; and from about 0.01 to about 3 weight percent, based on the weight of said polyacrylonitrile, of a sulfur- and phosphorous-containing stabilizer having the following general formula:
Claim 13
Dependent Claim
17 words
The stabilized film or fiber forming polyacrylonitrile composition of claim 13 wherein said stabilizer is trilauryl trithiophosphite.
Claim 14
Independent Claim
37 words
A method of forming stabilized film or fiber forming polyacrylonitrile compositions which comprises the steps of adding to a solvent selected from acetonitrile-water mixtures a minor amount of sulfur- and phosphorous-containing stabilizer having the following general formula:
Claim 15
Dependent Claim
15 words
The method of claim 15 wherein said solvent contains up to about 50 percent water.
Claim 16
Dependent Claim
47 words
The method of claim 15 wherein R1, R2, and R3 of said stabilizer are the same monovalent organic radicals selected from the group consisting of alkyl and alkaryl in an amount ranging from about 0.01 to about 3 weight percent, based on the weight of said polyacrylonitrile.
Claim 17
Dependent Claim
11 words
The method of claim 15 wherein said stabilizer is trilauryl trithiophosphite.
Claim 18
Dependent Claim
18 words
The method of claim 15 wherein said superatmospheric pressure is greater than the vapor pressure of said solvent.
Claim 19
Dependent Claim
22 words
The method of claim 15 wherein oxygen is excluded and the pH of the solvent is adjusted to about 6.0 - 7.0.
Claim 20
Dependent Claim
21 words
The method of claim 15 wherein said polyacrylonitrile consists essentially of from about 30 to about 70 percent of said compositions.
Claim 21
Independent Claim
42 words
A method of forming stabilized film or fiber forming polyacrylonitrile compositions which comprises the steps of adding from about 0.01 to about 3 weight percent, based on the weight of polyacrylonitrile, of a sulfur- and phosphorous-containing stabilizer having the following general formula:
Claim 22
Dependent Claim
11 words
The method of claim 22 wherein said stabilizer is trilauryl trithiophosphite.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |