US3933758A
Expired / Lapsed
US
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Iminoimidazolidinedione and parabanic acid polymers containing imide groups
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1973-10-26
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Granted: 1976-01-20
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Expires: 1993-10-26
Abstract
Abstract Novel iminoimidazolidinedione polymers containing imide groups (hereinafter PIPA-IM) are prepared from mixtures of dianhydrides, hydrogen cyanide and diisocyanates in an appropriate solvent and with an appropriate catalyst. The cyanide ion is an effective catalyst for all of the reactions involved. Hydrolysis of these polymers produces novel parabanic acid polymers containing imide groups (hereinafter PPA-IM).
Inventors
- 👤 Tad L. Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:51
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0605; C08G73/0616; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G18/38; C08G18/3819; C08G18/3838
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
29 words
As a composition of matter a new class of polymers which are iminoimidazolidinedione polymers containing imide groups or their hydrolysis derivatives, which are parabanic acid polymers containing imide groups.
Claim 2
Dependent Claim
29 words
As a composition of matter a new class of polymers which are iminoimidazolidinedione polymers containing imide groups or their hydrolysis derivatives, which are parabanic acid polymers containing imide groups.
Claim 3
Dependent Claim
19 words
The polymers of claim 1 which have at least one polyimide moiety and at least one polyparabanic acid moiety.
Claim 4
Dependent Claim
18 words
The polymers of claim 1 which have at least one polyimide moiety and at least one iminoimidazolidinedione moiety.
Claim 5
Dependent Claim
19 words
A polymer according to claim 1 which has at least one each of the units set forth below: ##SPC5##
Claim 6
Dependent Claim
17 words
A polymer according to claim 4 which contains at least two units as set forth below: ##SPC6##
Claim 7
Dependent Claim
23 words
The polymer of claim 1 wherein said dianhydride is derived from pyromelletic anhydride and the isocyanate derived portion is from a diphenylether diisocyanate.
Claim 8
Independent Claim
32 words
A method of preparing iminoimidazolidinedione polymers containing imide groups which comprises reacting in an appropriate solvent, a selected molar portion of dianhydrides, diisocyanates, and hydrogen cyanide in the presence of a catalyst.
Claim 9
Independent Claim
32 words
A method of preparing iminoimidazolidinedione polymers containing imide groups which comprises reacting in an appropriate solvent, a selected molar portion of dianhydrides, diisocyanates, and hydrogen cyanide in the presence of a catalyst.
Claim 10
Dependent Claim
26 words
The method of preparing polymers containing imide groups and parabanic acid groups by hydrolyzing iminoimidazolidinedione polymers containing imide groups prepared by the process of claim 7.
Claim 11
Dependent Claim
96 words
A method according to claim 7 in which the anhydride has the following formula ##SPC7## in which formula R represents a 2y-valent aliphatic, aliphatic-aromatic, or aromatic radical and y represents an integer from 2 to 3 and which the isocyanate has the following formula R' (nco) x in which R' is a C 4 to C 60 hydrocarbon or substituted hydrocarbon constituent, selected from the group consisting of aliphatic, alicyclic, aromatic constituents, or combinations and mixtures thereof in which the functionally substituted derivatives thereof will not react with isocyanate groups and X is 2 to 5.
Claim 12
Dependent Claim
22 words
A method according to claim 7 wherein said reaction takes place in the presence of a catalyst which is a cyanide ion.
Claim 13
Dependent Claim
18 words
A process according to the above claim 10 in which said cyanide ion is derived from sodium cyanide.
Claim 14
Dependent Claim
21 words
A process according to claim 7 above wherein the solvent utilized to carry out said reaction is an aprotic dipolar solvent.
Claim 15
Dependent Claim
16 words
A process according to claim 9 in which the isocyanate (NCO) group is substituted by NCS.
Claim 16
Dependent Claim
53 words
The process according to claim 7 in which a monoanhydride having a C 4 to C 60 hydrocarbon or substitute hydrocarbon constituent selected from aliphatic, alicyclic, aromatic constituents, or combinations and mixtures thereof, in which the functionally substituted derivatives thereof will not react with isocyanate groups, is used as a chain terminating agent.
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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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |