Patent US6097393A successfully refreshed from Google Patents.
Patent US4579782A successfully refreshed from Google Patents.
US4579782A
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Laminate comprising fibers embedded in cured amine terminated bis-imide
Assignee: National Aeronautics and Space Administration
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Filing: 1985-08-30
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Granted: 1986-04-01
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Expires: 2005-08-30
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
2026-10-26 14:29
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/28; B32B27/281; B32B27/06; B32B27/08; B32B5/00; B32B5/22; B32B5/24; B32B5/28; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1092; C08G73/12; C08G73/121; C08J; C08J5/00; C08J5/24; C08J5/248; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721; Y10T428/31725; Y10T428/31765
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
A laminate comprising fibers embedded in a resin comprising a cured polymer of an --NH-- crosslinked diaminebismaleimide 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
60 words
A laminate comprising fibers embedded in a resin comprising a cured polymer of an --NH-- crosslinked diaminebismaleimide 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 laminate of claim 1 in which X is --CH 2 -- and n is 1.
Claim 4
Dependent Claim
12 words
The laminate of claim 2 in which Y is --CH 2 --.
Claim 5
Dependent Claim
10 words
The laminate of claim 2 in which Y is --O--.
Claim 6
Dependent Claim
14 words
The laminate of claim 1 in which X is --O-- and n is 1.
Claim 7
Dependent Claim
10 words
The laminate of claim 5 in which Y is --O--.
Claim 8
Dependent Claim
12 words
The laminate of claim 5 in which Y is --CH 2 --.
Claim 9
Dependent Claim
16 words
The laminate of claim 1 in which X and Y are --CO-- and n is 1.
Claim 10
Dependent Claim
12 words
The laminate of claim 1 in which said fibers are graphite cloth.
Claim 11
Dependent Claim
23 words
The laminate of claim 1 in which X is --CH 2 --, n is 1 and Y is --O-- or --CH 2 --.
Claim 12
Dependent Claim
43 words
The laminate of claim 1 in which the diamine has the formula: ##STR9## wherein Y is a hydrocarbon group containing from 1 to 4 carbon atoms, --O--, --CO, --CH 2 --, --SO 2 , and n is a integer of 0 or 1.
Claim 13
Dependent Claim
12 words
The laminate of claim 11 in which said fibers are graphite cloth.
Claim 14
Dependent Claim
23 words
The laminate of claim 11 in which X is --CH 2 --, n is 1 and Y is --O-- or --CH 2 --.
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |