US4600769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amine terminated bisaspartimide polymer
Assignee: National Aeronautics and Space Administration
•
Filing: 1985-05-31
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Granted: 1986-07-15
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Expires: 2005-05-31
Abstract
Abstract Novel amine terminated bisaspartimides, especially 4,4'-bis{N2-[4-(4-aminophenoxy)phenyl]aspartimido} diphenylmethane are prepared by a Michael-type reaction of an aromatic bismaleimide and an aromatic diamine in an aprotic solvent. These bisaspartimides are thermally polymerized to yield tough, resinous polymers cross-linked through -NH- groups. Such polymers are useful in applications requiring materials with resistance to change at elevated temperatures, e.g., as lightweight laminates with graphite cloth, molding material prepregs, adhesives and insulating material.
Inventors
- 👤 Devendra Kumar
- 👤 George M. Fohlen
- 👤 John A. Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:06
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/28; C; C08; C08G; C08G73/00; C08G73/06; C08G73/0605; C08G73/0611; C08G73/10; C08G73/1092; C08G73/12; C08G73/121; C08J; C08J5/00; C08J5/24; C08J5/248; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
An --NH-- crosslinked diamine-bismaleimide polymer having two moles of diamine per mole of bismaleimide in recurring structural units of the formula: ##STR8## wherein X and Y are divalent radicals capable of linking two benzene rings and n is, independently in each case, an integer of 0 or 1.
Claim 2
Dependent Claim
48 words
An --NH-- crosslinked diamine-bismaleimide polymer having two moles of diamine per mole of bismaleimide in recurring structural units of the formula: ##STR8## wherein X and Y are divalent radicals capable of linking two benzene rings and n is, independently in each case, an integer of 0 or 1.
Claim 3
Dependent Claim
16 words
The polymer of claim 1 in which X is --CH 2 -- and n is 1.
Claim 4
Dependent Claim
10 words
The polymer of claim 2 in which Y is --O--.
Claim 5
Dependent Claim
12 words
The polymer of claim 2 in which Y is --CH 2 --.
Claim 6
Dependent Claim
16 words
The polymer of claim 1 in which X and Y are --CO-- and n is 1.
Claim 7
Dependent Claim
69 words
An aspartimide crosslinked thermally cured resinous polymer product consisting essentially of a homopolymer of a compound having the formula: ##STR9## wherein X and Y are divalent radicals capable of linking two benzene rings and n is, independently in each case, an integer of 0 or 1 and wherein during thermal cure, the terminal NH 2 groups react with and open the internal ##STR10## groups to form the aspartimide crosslinks.
Claim 8
Dependent Claim
69 words
An aspartimide crosslinked thermally cured resinous polymer product consisting essentially of a homopolymer of a compound having the formula: ##STR9## wherein X and Y are divalent radicals capable of linking two benzene rings and n is, independently in each case, an integer of 0 or 1 and wherein during thermal cure, the terminal NH 2 groups react with and open the internal ##STR10## groups to form the aspartimide crosslinks.
References Cited (Backward Citations)
US3740378A
Cited
US3998904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |