US4038263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of p-phenylene sulfide polymers
Assignee: Phillips Petroleum Co
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Filing: 1975-05-27
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Granted: 1977-07-26
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Expires: 1995-05-27
Abstract
Abstract A method by which p-phenylene sulfide polymers are produced by admixing p-dihalobenzene, an alkali metal sulfide, an organic amide, a lithium halide, and optionally, a base, at polymerization conditions thereby producing a polymer of higher molecular weight as evidenced by lower melt flow and higher inherent viscosity than is obtained without the addition of the lithium halide.
Inventors
- 👤 James T. Edmonds, Jr.
- 👤 Robert W. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:53
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/025; C08G75/0254
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
54 words
A method for producing polymers comprising: a. forming a composition by contacting at least one p-dihalobenzene, at least one alkali metal sulfide, at least one organic amide, and at least one lithium halide, and b. maintaining at least a portion of said composition under polymerization conditions for a time sufficient to produce a polymer.
Claim 2
Independent Claim
54 words
A method for producing polymers comprising: a. forming a composition by contacting at least one p-dihalobenzene, at least one alkali metal sulfide, at least one organic amide, and at least one lithium halide, and b. maintaining at least a portion of said composition under polymerization conditions for a time sufficient to produce a polymer.
Claim 3
Dependent Claim
12 words
A method of claim 1 wherein said composition also contains a base.
Claim 4
Dependent Claim
71 words
A method of claim 1 wherein: a. at least one alkali metal sulfide, at least one lithium halide, and at least one organic amide are contacted to form a first composition, b. said first composition is dehydrated to form a first dehydrated composition, and c. at least one p-dihalobenzene is contacted with said first dehydrated composition under polymerization conditions for a period of time sufficient to form a p-phenylene sulfide polymer.
Claim 5
Dependent Claim
72 words
A method of claim 1 wherein: a. at least one alkali metal sulfide and at least one organic amide are contacted to form a first composition, b. said first composition is dehydrated to form a first dehydrated composition, and c. at least one p-dihalobenzene and at least one lithium halide are contacted with said first dehydrated composition under polymerization conditions for a period of time sufficient to form a p-phenylene sulfide polymer.
Claim 6
Dependent Claim
26 words
A method of claim 4 wherein at least one base is present in said first composition along with said alkali metal sulfide and said organic amide.
Claim 7
Dependent Claim
45 words
A method of claim 1 wherein the mole ratio of p-dihalobenzene to alkali metal sulfide is within the range of about 0.9:1 to about 2:1, the mole ratio of lithium halide to alkali metal sulfide is within the range of about 0.05:1 to about 1.5:1.
Claim 8
Dependent Claim
65 words
A method of claim 2 wherein the mole ratio of p-dihalobenzene to alkali metal sulfide is within the range of about 0.9:1 to about 2:1, the mole ratio of base to alkali metal sulfide is within the range of about 0.015:1 to about 0.8:1, and the mole ratio of lithium halide to alkali metal sulfide is within the range of about 0.05:1 to about 4:1.
Claim 9
Dependent Claim
45 words
A method of claim 3 wherein the mole ratio of p-dihalobenzene to alkali metal sulfide is within the range of about 0.9:1 to about 2:1, the mole ratio of lithium halide to alkali metal sulfide is within the range of about 0.05:1 to about 1.5:1.
Claim 10
Dependent Claim
45 words
A method of claim 4 wherein the mole ratio of p-dihalobenzene to alkali metal sulfide is within the range of about 0.9:1 to about 2:1, the mole ratio of lithium halide to alkali metal sulfide is within the range of about 0.05:1 to about 1.5:1.
Claim 11
Dependent Claim
65 words
A method of claim 5 wherein the mole ratio of p-dihalobenzene to alkali metal sulfide is within the range of about 0.9:1 to about 2:1, the mole ratio of base to alkali metal sulfide is within the range of about 0.015:1 to about 0.8:1, and the mole ratio of lithium halide to alkali metal sulfide is within the range of about 0.05:1 to about 4:1.
Claim 12
Dependent Claim
55 words
A method of claim 1 wherein the polymerization conditions comprise a reaction temperature within the range of about 125° C. to about 450° C., a reaction pressure sufficient to maintain the p-dihalobenzene and organic amide substantially in the liquid phase, and the reaction time within the range of about 10 minutes to about 72 hours.
Claim 13
Dependent Claim
59 words
A method of claim 3 wherein the p-dihalobenzene is p-dichlorobenzene, the alkali metal sulfide is sodium sulfide, the lithium halide is lithium chloride, and the organic amide is N-methyl-2-pyrrolidone, the reaction temperature is within the range of about 175° C. to about 350° C. and the reaction time is within the range of about 1 to about 8 hours.
Claim 14
Dependent Claim
64 words
A method of claim 5 wherein the p-dihalobenzene is p-dichlorobenzene, the alkali metal sulfide is sodium sulfide, the lithium halide is lithium chloride, the organic amide is N-methyl-2-pyrrolidone, and the base is sodium hydroxide, the reaction temperature is within the range of about 175° C. to about 350° C. and the reaction time is within the range of about 1 to about 8 hours.
Claim 15
Dependent Claim
58 words
A method of claim 4 wherein the p-dihalobenzene is p-dichlorobenzene, the alkali metal sulfide is sodium sulfide, the lithium halide is lithium bromide, the organic amide is N-methyl-2-pyrrolidone, the reaction temperature is within the range of about 175° C. to about 350° C. and the reaction time is within the range of about 1 to about 8 hours.
Claim 16
Dependent Claim
58 words
A method of claim 4 wherein the p-dihalobenzene is p-dichlorobenzene, the alkali metal sulfide is sodium sulfide, the lithium halide is lithium chloride, the organic amide is N-methyl-2-pyrrolidone, the reaction temperature is within the range of about 175° C. to about 350° C. and the reaction time is within the range of about 1 to about 8 hours.
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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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |