US3925314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage-stable compositions of polyimides and azomethines
Assignee: Novartis Corp
•
Filing: 1974-09-03
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Granted: 1975-12-09
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Expires: 1994-09-03
Abstract
Abstract Mixtures which can be cured to give moulded materials having technically very valuable and dielectric properties and which are characterised in that they contain: A. Bis-imides or tris-imides of certain unsaturated dicarboxylic acids, such as maleic acid, dimethylmaleic acid, citraconic acid or itaconic acid, B. POLYAMINES, C. AZOMETHINES AND OPTIONALLY D. A CURING CATALYST.
Inventors
- 👤 Alfred Renner
- 👤 Theobald Haug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:08
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/126; C08G73/127; C08G73/121; C08G73/122; C08G73/125
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
19 words
A STORAGE-STABLE, THERMOSETTING COMPOSITION OF MATTER, WHICH COMPRISES A. POLYIMIDES OF CERTAIN UNSATURATED DICARBOXYLIC ACIDS THE GENERAL FORMULA I
Claim 2
Dependent Claim
19 words
A STORAGE-STABLE, THERMOSETTING COMPOSITION OF MATTER, WHICH COMPRISES A. POLYIMIDES OF CERTAIN UNSATURATED DICARBOXYLIC ACIDS THE GENERAL FORMULA I
Claim 3
Dependent Claim
26 words
A composition according to claim 1, which comprises a. polyimides of the formula I, in which A denotes a radical selected from the formula consisting of
Claim 4
Dependent Claim
32 words
A composition according to claim 1, characterised in that the sum of the equivalents of primary amino group and >C N group amounts to 1.0 equivalent per 1 equivalent of imide group.
Claim 5
Dependent Claim
17 words
A composition according to claim 1, which comprises N,N''-4, 4''-diaminodiphenylmethane-bis-maleimide as the polyimide of the formula I.
Claim 6
Dependent Claim
13 words
A composition according to claim 1, which comprises a tris-maleimide of the formula
Claim 7
Dependent Claim
20 words
A composition according to claim 1, which comprises N,N''-4, 4''-diaminophenyl-ether-bis-maleimide, N,N''-m-phenylene-bis-maleimide or N,N''-4,4''-diaminodiphenylmethane-bis-citraconimide as the polyimide of the formula I.
Claim 8
Dependent Claim
19 words
A composition according to claim 1, which comprises 4,4''-diaminodiphenylmethane or tri-(b 4-aminophenyl)-phosphate as the polyamine of the formula II.
Claim 9
Dependent Claim
19 words
A composition according to claim 1, which comprises 4,4''-diaminodiphenyl-ether, 3,3''-dichloro-4,4''-diaminodiphenylmethane or hexamethylenediamine as the polyamine of the formula II.
Claim 10
Dependent Claim
14 words
A composition according to claim 1, which comprises N,N''-bis-(benzylidene)-hexamethylenediamine or N,N''-bis-(benzylidene)-p-phenylenediamine as the azomethine.
Claim 11
Dependent Claim
37 words
A composition according to claim 1, which comprises a member selected from the group consisting of N,N'' -bis-(benzylidene)-hexanediol-1,6-di-( gamma -aminopropyl)-ether, N,N'' -bis(benzylidene)-1,3-( gamma -aminopropyl)-5,5-dimethylhydantoin, N,N''-bis-(benzylidene)-ethylenediamine, N,N''-bis-(benzylidene)-4, 4''-diaminodiphenyl-ether, N,N'' -bis-(benzylidene)-4,4''-diamino-3, 3''-dichlorodiphenylmethane, N,N''-bis-(benzylidene)-p-xylylenediamine, N,N''-bis(furfurylidene)-4,4''-diaminodiphenylmethane and terephthaldianil as the azomethine.
Claim 12
Dependent Claim
24 words
A composition according to claim 1, wherein additionally 0.01 to 5% of a curing catalyst is present by weight of the total curable mixture.
Claim 13
Dependent Claim
14 words
A composition according to claim 11, which comprises tert.-butyl perbenzoate as the curing catalyst.
References Cited (Backward Citations)
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |