US3864309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymer of polyimide oligomers and terephthalonitrile n,n-dioxide and their methods of preparation
Assignee: Raytheon Co
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Filing: 1973-11-16
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Granted: 1975-02-04
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Expires: 1993-11-16
Abstract
Abstract We have disclosed a new class of thermosetting copolymers derived from terephthalonitrile N, N''-dioxide and polyimide oligomer that cure through addition reactions to form essentially void-free cured resins that exhibit outstanding high temperature stability. These copolymers may be formed from either acetylene terminated polyimide oligomers or nitrile terminated polyimide oligomers. Copolymers prepared in accordance with our invention exhibit little or no outgassing during cure and are extremely useful in the preparation of laminates where high temperature stability and high strength is required.
Inventors
- 👤 Norman Bilow
- 👤 Abraham L Landis
- 👤 Leroy J Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:53
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/124; C08G73/1085
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
26 words
COPOLYMERS OF ADDITION CURED POLYAMIDES FORMED FROM THE REACTION OF AROMATIC BIS(NITRILEOXIDES) AND CYANO- OR ACETYLENE-SUBSTITUTED POLYAMIDE OLIGOMERS AND CONSISTING ESSENTIALLY OF THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
26 words
COPOLYMERS OF ADDITION CURED POLYAMIDES FORMED FROM THE REACTION OF AROMATIC BIS(NITRILEOXIDES) AND CYANO- OR ACETYLENE-SUBSTITUTED POLYAMIDE OLIGOMERS AND CONSISTING ESSENTIALLY OF THE FOLLOWING GENERAL FORMULA:
Claim 3
Dependent Claim
12 words
The copolymers of claim 1 wherein the dinitrile dioxide is terephthalonitrile N,N''-dioxide.
Claim 4
Dependent Claim
18 words
The copolymers of claim 1 wherein the polyimide oligomers consist of acetylene substutited materials having the following structure:
Claim 5
Dependent Claim
14 words
The copolymers of claim 2 wherein the polyimide oligomers are acetylene substituted polyimide oligomers.
Claim 6
Dependent Claim
18 words
The copolymers of claim 1 wherein the polyimide oligomers consist of cyano substituted compounds having the following structure:
Claim 7
Dependent Claim
15 words
The copolymers of claim 2 wherein the polyimide oligomers consist of cyano substituted polyimide oligomers.
Claim 8
Dependent Claim
13 words
A copolymer of claim 4 wherein X is CO and R is -C6H4OC6H4OC6H4-.
Claim 9
Dependent Claim
14 words
A copolymer of claim 6 where in X is CO and R is -C6H4OC6H4OC6H4-.
Claim 10
Independent Claim
75 words
A method for preparing copolymers of bis(nitrileoxides) and acetylene substituted polyimide oligomers comprised of the steps of: a. forming a solution of the polyimide oligomer in an organic solvent; b. adding the bis(nitrileoxide) to said solution under constant agitation to form a mixture; c. allowing said mixture to gel, whereby the desired resin is formed; d. separating said resin from said gel by applying an alcoholic solvent; and e. causing said resin to be dried.
Claim 11
Independent Claim
75 words
A method for preparing copolymers of bis(nitrileoxides) and acetylene substituted polyimide oligomers comprised of the steps of: a. forming a solution of the polyimide oligomer in an organic solvent; b. adding the bis(nitrileoxide) to said solution under constant agitation to form a mixture; c. allowing said mixture to gel, whereby the desired resin is formed; d. separating said resin from said gel by applying an alcoholic solvent; and e. causing said resin to be dried.
Claim 12
Dependent Claim
15 words
The method of claim 9 wherein the solvent employed to form the solution is sulfolane.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |