US4043978A
Expired / Lapsed
US
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Polyimides
Assignee: Yeda Research and Development Co Ltd
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Filing: 1974-03-20
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Granted: 1977-08-23
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Expires: 1994-03-20
Abstract
Abstract A process for the production of novel polyimide polymers and copolymers which comprises reacting a cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride, or a derivative of same, with an amine, or mixture of amines, of the formula H 2 N--A--NH 2 wherein A designates an aliphatic, an aromatic, an araliphatic or a heterocyclic group, which may be substituted. Novel polyimides obtained by such process.
Inventors
- 👤 Gerhard Martin Julius Schmidt, deceased
- 👤 Michael Dror
- 👤 Gad Friedman
- 👤 Harold H. Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:53
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1075; C08G73/1078
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
37 words
A process for the production of polyimide polymers, which comprises reacting cyclooctadiene- 1,2,5,6-tetracarboxylic acid bisanhydride with 4,4'-diamino-diphenyl-methane, 4,4'-diamino-diphenyl ether, a mixture of 4,4'-diamino-diphenyl-methane and 4,4'-diaminodiphenyl ether or hexamethylene diamine in the presence of m-cresol as a solvent.
Claim 2
Dependent Claim
37 words
A process for the production of polyimide polymers, which comprises reacting cyclooctadiene- 1,2,5,6-tetracarboxylic acid bisanhydride with 4,4'-diamino-diphenyl-methane, 4,4'-diamino-diphenyl ether, a mixture of 4,4'-diamino-diphenyl-methane and 4,4'-diaminodiphenyl ether or hexamethylene diamine in the presence of m-cresol as a solvent.
Claim 3
Dependent Claim
22 words
The process of claim 1, wherein the reaction is carried out at temperatures within the range of from 80° to 110° C.
Claim 4
Dependent Claim
13 words
The process of claim 1, which comprises reacting cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride with 4,4'-diamino-diphenyl-methane.
Claim 5
Dependent Claim
14 words
The process of claim 1, which comprises reacting cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride with 4,4'-diamino-diphenyl ether.
Claim 6
Dependent Claim
40 words
A polyimide prepared by the reaction, in the presence of m-cresol as a solvent, of a cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride and an amine of the general formula H 2 N--A--NH 2 , wherein A is an aliphatic, aromatic or araliphatic group.
Claim 7
Dependent Claim
40 words
A polyimide prepared by the reaction, in the presence of m-cresol as a solvent, of a cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride and an amine of the general formula H 2 N--A--NH 2 , wherein A is an aliphatic, aromatic or araliphatic group.
Claim 8
Dependent Claim
14 words
The process of claim 1, which comprises reacting cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride with hexamethylene diamine.
Claim 9
Dependent Claim
27 words
The polyimide of claim 6, comprising the reaction product of cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride with 4,4'-diamino-diphenyl-methane, 4,4'-diamino-diphenyl ether, a mixture of 4,4'-diamino-diphenyl-methane and 4,4'diaminodiphenyl ether, or hexamethylene diamine.
Claim 10
Dependent Claim
15 words
The polyimide of claim 6, comprising the reaction product of cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride with 4,4'-diamino-diphenyl-methane.
Claim 11
Dependent Claim
16 words
The polyimide of claim 6, comprising the reaction product of cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride with 4,4'-diamino-diphenyl ether.
Claim 12
Dependent Claim
16 words
The polyimide of claim 6, comprising the reaction product of cyclooctadiene-1,2,5,6-tetracarboxylic acid bisanhydride with hexamethylene diamine.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |