US4082768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New imides of unsaturated dicarboxylic acids, processes for their manufacture, and their use
Assignee: Novartis Corp
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Filing: 1976-05-19
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Granted: 1978-04-04
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Expires: 1996-05-19
Abstract
Abstract New bis-imides and tris-imides of the formula ##STR1## in which A and A' denote aromatic radicals which are optionally substituted or interrupted by an oxygen atom, an alkylene group or a sulphonyl group, Z denotes a radical of the formulae ##STR2## D denotes an oxygen atom or sulphur atom, m denotes the number 1 or 0 and n denotes the number 2 or 3, are obtained by cyclizing dicarboxylic acid monoamide compounds of the formula ##STR3## WITH ELIMINATION OF WATER. The bis-imides and tris-imides, mixed with azomethines and optionally with curing catalysts, can be used for the manufacture of moulded materials having technically very valuable mechanical and dielectric properties.
Inventors
- 👤 Alfred Renner
- 👤 Theobald Haug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/5398; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/553; C07F9/5537; C08K5/51; C08K5/52; C08K5/529
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A bis-imide or tris-imide selected from the group consisting of the N,N'-bis-maleimide of 4,4'-diaminotriphenyl phosphate, the N,N'-bis-citraconimide of 4"-tertbutyl-4,4'-diaminotriphenyl phosphate, the N,N'-bis-maleimide of 3,3'-diamino-3"-dimethylaminotriphenyl phosphate, the N,N'-bis-itaconimide of bis-(4-aminophenyl)-bisphenylyl phosphate, the N,N'-bis-maleimide of bis-(4-aminophenyl)-2-naphthyl phosphate, the N,N',N"-tris-maleimide of tris(4-aminophenyl) phosphate, the N,N',N"-tris-citraconimide of tris-(4-aminophenyl)phosphate, the N,N'-bis-maleimide of 4,4'-diaminotriphenyl phosphite, the N,N'-bis-maleimide of diaminotriphenyl thiophosphate, the N,N',N"-tris-maleimide of tris-(4-aminophenyl) phosphite, the N,N',N"-tris-maleimide of tris-(4-aminophenyl) thiophosphate and the N,N',N"-trismaleimide of tris-(4-aminophenyl) thiophosphate.
Claim 2
Dependent Claim
70 words
A bis-imide or tris-imide selected from the group consisting of the N,N'-bis-maleimide of 4,4'-diaminotriphenyl phosphate, the N,N'-bis-citraconimide of 4"-tertbutyl-4,4'-diaminotriphenyl phosphate, the N,N'-bis-maleimide of 3,3'-diamino-3"-dimethylaminotriphenyl phosphate, the N,N'-bis-itaconimide of bis-(4-aminophenyl)-bisphenylyl phosphate, the N,N'-bis-maleimide of bis-(4-aminophenyl)-2-naphthyl phosphate, the N,N',N"-tris-maleimide of tris(4-aminophenyl) phosphate, the N,N',N"-tris-citraconimide of tris-(4-aminophenyl)phosphate, the N,N'-bis-maleimide of 4,4'-diaminotriphenyl phosphite, the N,N'-bis-maleimide of diaminotriphenyl thiophosphate, the N,N',N"-tris-maleimide of tris-(4-aminophenyl) phosphite, the N,N',N"-tris-maleimide of tris-(4-aminophenyl) thiophosphate and the N,N',N"-trismaleimide of tris-(4-aminophenyl) thiophosphate.
Claim 3
Dependent Claim
9 words
Tris-maleimide according to claim 1 of the formula ##STR18##
Claim 4
Dependent Claim
9 words
Tris-maleimide according to claim 1 of the formula ##STR19##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |