US3968087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of 2-pyrrolidone
Assignee: Chevron USA Inc
•
Filing: 1974-11-08
•
Granted: 1976-07-06
•
Expires: 1994-11-08
Abstract
Abstract 2-Pyrrolidone is polymerized in the presence of an alkaline polymerization catalyst and, as an activator, a complex of a halogenated lactam of the formula: ##EQU1## and a Lewis acid of the formula MX a , wherein M IS 2 OR 3; n is 5 to 11; M is a metal of Group IIIA, IVA, VA, VIA or IVB of the Periodic Table; a is the valence of M; and X and X' are independently chlorine or bromine.
Inventors
- 👤 Sam Kwon Choi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:35
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D223/00; C07D223/02; C07D223/06; C07D223/08; C07D223/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
A method of making a polymer of 2-pyrrolidone in solid form, which comprises polymerizing 2-pyrrolidone in the presence of an alkaline polymerization catalyst and, as an activator or co-catalyst, an effective amount of a complex of a Lewis acid of the formula MX a and a halogenated lactam of the formula: ##EQU12## where m = 2 or 3, n = 5 to 11; M is a metal of Group IIIA, IVA, VA, VIA or IVB of the Periodic Table; a is the valence of M; and X and X' are independently chlorine or bromine.
Claim 2
Independent Claim
94 words
A method of making a polymer of 2-pyrrolidone in solid form, which comprises polymerizing 2-pyrrolidone in the presence of an alkaline polymerization catalyst and, as an activator or co-catalyst, an effective amount of a complex of a Lewis acid of the formula MX a and a halogenated lactam of the formula: ##EQU12## where m = 2 or 3, n = 5 to 11; M is a metal of Group IIIA, IVA, VA, VIA or IVB of the Periodic Table; a is the valence of M; and X and X' are independently chlorine or bromine.
Claim 3
Dependent Claim
9 words
The method of claim 1, wherein m is 3.
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein n is 5 to 8.
Claim 5
Dependent Claim
18 words
The method of claim 1, wherein M is aluminum or tin and X and X' are each chlorine.
Claim 6
Dependent Claim
57 words
The method of claim 2, wherein the complex is a complex of said Lewis acid MX a and a halogenated lactam of the formula: ##EQU13## wherein M is selected from the group consisting of aluminum, tin, antimony, germanium, titanium, zirconium and hafnium; a is the valence of M; and X and X' are each chlorine or bromine.
Claim 7
Dependent Claim
57 words
The method of claim 1, wherein the complex is a complex of said Lewis acid MX a and a halogenated lactam of the formula: ##EQU14## wherein M is selected from the group consisting of aluminum, tin, antimony, germanium, titanium, zirconium and hafnium; a is the valence of M; and X and X' are each chlorine or bromine.
Claim 8
Dependent Claim
105 words
The method of claim 1, comprising adding to a substantially anhydrous mixture of 2-pyrrolidone and said alkaline polymerization catalyst, said halogenated compound of the formula: ##EQU15## followed by addition to the solution of said Lewis acid of the formula MX a , wherein m is 2 or 3, n is 5 to 11, M is a metal of Group IIIA, IVA, VA, VIA or IVB of the Periodic Table, a is the valence of M, and X and X' are independently chlorine or bromine, thereby forming said complex in situ, and then polymerizing said 2-pyrrolidone in the presence of said complex and said alkaline catalyst.
Claim 9
Dependent Claim
34 words
The method of claim 7, wherein the complex is present in an amount of from trace amounts to up to about 30 mol per cent, based on the mols of the alkaline polymerization catalyst.
References Cited (Backward Citations)
US3405099A
Cited
US3383367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |