US4017465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerization of 2-pyrrolidone
Assignee: Chevron USA Inc
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Filing: 1975-01-23
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Granted: 1977-04-12
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Expires: 1995-01-23
Abstract
Abstract A process for polymerizing 2-pyrrolidone utilizing an agitated reaction mixture containing an inert nonsolvent and an insoluble salt in order to produce a particulate, or easily comminuted, solid product.
Inventors
- 👤 Robert Bacskai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
63 words
The process for polymerizing 2-pyrrolidone comprising agitating 2-pyrrolidone, alkaline polymerization catalyst, polymerization initiator, an inert nonsolvent in weight ratio to 2-pyrrolidone of about 0.5-20:1, and an insoluble salt, which is alkali metal halide in weight ratio to 2-pyrrolidone of about 1-10:1 at a temperature of from 25° to about 70° C for 4 to about 100 hours to form a particulate poly-2-pyrrolidone product.
Claim 2
Dependent Claim
63 words
The process for polymerizing 2-pyrrolidone comprising agitating 2-pyrrolidone, alkaline polymerization catalyst, polymerization initiator, an inert nonsolvent in weight ratio to 2-pyrrolidone of about 0.5-20:1, and an insoluble salt, which is alkali metal halide in weight ratio to 2-pyrrolidone of about 1-10:1 at a temperature of from 25° to about 70° C for 4 to about 100 hours to form a particulate poly-2-pyrrolidone product.
Claim 3
Dependent Claim
36 words
The process according to claim 1 wherein said alkaline polymerization catalyst is selected from the group consisting of the reaction product of alkali metal, alkali metal hydroxide, alkali metal carbonate, and quaternary ammonium hyroxide with 2-pyrrolidone.
Claim 4
Dependent Claim
20 words
The process according to claim 2 wherein said polymerization initiator is CO 2 , or derived from CO 2 .
Claim 5
Dependent Claim
27 words
The process according to claim 1 wherein said insoluble salt is present in the reaction mixture to an extent greater than about 3:1 weight ratio to 2-pyrrolidone.
Claim 6
Dependent Claim
21 words
The process according to claim 1 wherein said inert nonsolvent is a C 5 -C 10 nonaromatic hydrocarbon or mixture thereof.
Claim 7
Dependent Claim
13 words
The process according to claim 1 wherein said insoluble salt is sodium chloride.
Claim 8
Dependent Claim
30 words
The process according to claim 1 wherein said inert nonsolvent is present in the reaction mixture to the extent of from about 2:1 to about 3:1 weight ratio to 2-pyrrolidone.
Claim 9
Dependent Claim
85 words
The process for polymerizing 2-pyrrolidone by agitating a reaction mixture containing 2-pyrrolidone, alkaline polymerization catalyst, polymerization initiator, and inert nonsolvent in weight ratio to 2-pyrrolidone of about 0.5 - 20:1, and an insoluble salt, which is alkali metal halide, in such weight ratio to 2-pyrrolidone as to saturate the reaction mixture leaving the bulk of its weight present undissolved in the reaction mixture, at a temperature of from 25° to about 70° C for 4 to about 100 hours to form a particulate poly-2-pyrrolidone product.
Claim 10
Dependent Claim
85 words
The process for polymerizing 2-pyrrolidone by agitating a reaction mixture containing 2-pyrrolidone, alkaline polymerization catalyst, polymerization initiator, and inert nonsolvent in weight ratio to 2-pyrrolidone of about 0.5 - 20:1, and an insoluble salt, which is alkali metal halide, in such weight ratio to 2-pyrrolidone as to saturate the reaction mixture leaving the bulk of its weight present undissolved in the reaction mixture, at a temperature of from 25° to about 70° C for 4 to about 100 hours to form a particulate poly-2-pyrrolidone product.
Claim 11
Dependent Claim
25 words
The process according to claim 8 wherein said insoluble salt is present in said reaction mixture in weight ratio to 2-pyrrolidone of about 1-14 10:1.
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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |