US4098774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium catalyst system for the polymerization of 2-pyrrolidone
Assignee: Chevron USA Inc
•
Filing: 1976-05-19
•
Granted: 1978-07-04
•
Expires: 1996-05-19
Abstract
Abstract The process of making a catalyst for the polymerization of 2-pyrrolidone by contacting an alkali metal pyrrolidonate, a quaternary ammonium halide and carbon dioxide in a mol ratio of about 1:0.1-2:0.1-0.5. The alkali metal pyrrolidonate may be prepared by reacting an alkali metal hydroxide with 2-pyrrolidone. The polymerization of 2-pyrrolidone in the presence of this catalyst system produces poly-2-pyrrolidone of high molecular weight.
Inventors
- 👤 Robert Bacsksai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:13
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A process for polymerizing 2-pyrrolidone to form a polymer suitable for forming fibers in a polymerization reaction zone which comprises contacting the 2-pyrrolidone with a catalyst comprising potassium pyrrolidonate, tetra alkyl ammonium halide and carbon dioxide in a mol ratio of 1:0.1-2:0.1-0.5 and wherein the water content in the reaction zone does not exceed about 0.1-0.2 weight percent based on total 2-pyrrolidone feed.
Claim 2
Dependent Claim
63 words
A process for polymerizing 2-pyrrolidone to form a polymer suitable for forming fibers in a polymerization reaction zone which comprises contacting the 2-pyrrolidone with a catalyst comprising potassium pyrrolidonate, tetra alkyl ammonium halide and carbon dioxide in a mol ratio of 1:0.1-2:0.1-0.5 and wherein the water content in the reaction zone does not exceed about 0.1-0.2 weight percent based on total 2-pyrrolidone feed.
Claim 3
Dependent Claim
21 words
A process in accordance with claim 1 wherein the tetraalkyl ammonium halide is tetra C 1 -C 6 alkyl ammonium halide.
Claim 4
Dependent Claim
21 words
A process in accordance with claim 1 wherein the tetraalkyl ammonium halide is tetramethyl, tetraethyl or tetrapropyl ammonium chloride or bromide.
Claim 5
Dependent Claim
15 words
A process in accordance with claim 1 wherein the alkali metal pyrrolidonate is potassium pyrrolidonate.
Claim 6
Dependent Claim
14 words
A process in accordance with claim 1 wherein said mol ratio is about 1:0.2-1.5:0.1-0.5.
Claim 7
Dependent Claim
24 words
A process in accordance with claim 1 wherein the alkali metal pyrrolidonate is prepared by steps comprising contacting an alkali metal hydroxide with 2-pyrrolidone.
Claim 8
Dependent Claim
16 words
A process in accordance with claim 1 wherein the tetraalkyl ammonium halide is tetramethyl ammonium halide.
Claim 9
Dependent Claim
33 words
A process in accordance with claim 1 wherein the catalyst also comprises 0.05-1.0 mol percent of a polymerization activator selected from the group consisting of N-acyl pyrrolidone, N-acyl caprolactum, acetic anhydride, and 1-(1-pyrrolin-2-yl)-2-pyrrolidone.
Claim 10
Dependent Claim
14 words
A process in accordance with claim 8 wherein the N-acyl pyrrolidone is N-acetyl pyrrolidone.
References Cited (Backward Citations)
US2638463A
Cited
US3346566A
Cited
US3681294A
Cited
US3681295A
Cited
US3721652A
Cited
US3835100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |