US4098767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of ethynyl terminated polyimides and diethynylbenzene
Assignee: Raytheon Co
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Filing: 1974-11-25
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Granted: 1978-07-04
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Expires: 1994-11-25
Abstract
Abstract A new class of copolymers obtained via copolymerizing diethynylbenzene with an ethynyl substituted polyimide oligomer has been developed. The copolymers are thermosetting in character and are particularly useful for the fabrication of composite structures such as glass fiber reinforced laminates and molding compounds and graphite fiber reinforced laminates and molding compounds having zero void content.
Inventors
- 👤 Norman Bilow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/101; C08F; C08F238/00; C08F281/00; C08F283/00; C08F283/04; C08F38/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31623; Y10T428/31721
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
52 words
Composite materials prepared from copolymers comprised of an ethynyl-substituted polyimide oligomer comprised of the following general structure ##STR5## n=0 to 5, m=0 to 5, and x=O, S, CH 2 , CO, SO 2 coreacted with less than 20% of a di- or polyethynyl-substituted diluent and a reinforcing fabric, filler or chopped fiber.
Claim 2
Dependent Claim
52 words
Composite materials prepared from copolymers comprised of an ethynyl-substituted polyimide oligomer comprised of the following general structure ##STR5## n=0 to 5, m=0 to 5, and x=O, S, CH 2 , CO, SO 2 coreacted with less than 20% of a di- or polyethynyl-substituted diluent and a reinforcing fabric, filler or chopped fiber.
Claim 3
Dependent Claim
43 words
A new class of copolymers comprised of less than 20% by weight of a di- or polyethynyl-substituted diluent coreacted with an ethynyl substituted polyimide oligomer comprised of the following general structure ##STR6## n=0-5, m=0-5, and x=O,S, CH 2 , CO, SO 2 .
Claim 4
Dependent Claim
43 words
A new class of copolymers comprised of less than 20% by weight of a di- or polyethynyl-substituted diluent coreacted with an ethynyl substituted polyimide oligomer comprised of the following general structure ##STR6## n=0-5, m=0-5, and x=O,S, CH 2 , CO, SO 2 .
Claim 5
Dependent Claim
17 words
The copolymer of claim 2 wherein "n" is 2, "m" is 0, and said diluent is diethynylbenzene.
Claim 6
Dependent Claim
18 words
The copolymer of claim 2 wherein "n" is 2, "m" is 0, and said diluent is diethynyldiphenyl ether.
Claim 7
Dependent Claim
16 words
The material of claim 1 wherein "n"is 2, "m" is 0, and said diluent is diethynylbenzene.
Claim 8
Dependent Claim
18 words
The material of claim 1 wherein "n" is 2, "m" is 0, and said diluent is diethynyldiphenyl ether.
References Cited (Backward Citations)
US3845018A
Cited
US3864309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |