Patent US4100138A successfully refreshed from Google Patents.
US4100138A
Expired / Lapsed
US
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Ethnyl terminated polyimide composites
Assignee: Raytheon Co
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Filing: 1975-05-12
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Granted: 1978-07-11
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Expires: 1995-05-12
Abstract
Abstract A new class of copolymers obtained via the copolymerization of diethynylbenzene with an ethynyl-substituted polyimide oligomer has been used to prepare composite materials exhibiting zero void content. 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.
Inventors
- 👤 Norman Bilow
- 👤 Boyce G. Kimmel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:46
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/123; C08G73/1003; C08G73/1007; C08G73/101; C08G73/121; C08G73/122; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31623
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
Laminating materials comprising copolymers or terpolymers consisting of an ethynyl-substituted polyimide oligomer coreacted with di- or polyethynyl-substituted diluent or mixtures of such diluents and a reinforcing fabric, filler or chopped fiber.
Claim 2
Dependent Claim
31 words
Laminating materials comprising copolymers or terpolymers consisting of an ethynyl-substituted polyimide oligomer coreacted with di- or polyethynyl-substituted diluent or mixtures of such diluents and a reinforcing fabric, filler or chopped fiber.
Claim 3
Dependent Claim
45 words
The materials of claim 1 wherein said oligomer is comprised of the following general structure: ##STR6## n = 0 to 5, m = 0 to 5, and x = O, S, CH 2 , CO, SO 2 , ##STR7## or --CF 2 -O-CF 2 --.
Claim 4
Dependent Claim
31 words
The materials of claim 1 wherein said copolymer is comprised from an oligomer having the following structure: ##STR8## and wherein said diluents constitute up to 20% by weight of said oligomer.
Claim 5
Dependent Claim
23 words
The materials of claim 1 wherein the copolymer is the reaction product of diethynylbenzene and a polyimide oligomer having the following structure: ##STR9##
Claim 6
Dependent Claim
15 words
The material of claim 4 wherein diethynylbenzene constitutes 5-15% by weight of said polyimide oligomer.
Claim 7
Dependent Claim
23 words
The materials and laminates of claim 1 wherein the copolymer is comprised of diethynylbenzene (DEB) and an oligomer having the following structure: ##STR10##
Claim 8
Dependent Claim
37 words
Composite structural materials comprising copolymers or terpolymers consisting of polyimide oligomers having ethynyl terminated end groups coreacted with a di- or polyethynyl- substituted diluent or mixtures of such diluents and a reinforcing fabric, filter or chopped fiber.
Claim 9
Dependent Claim
37 words
Composite structural materials comprising copolymers or terpolymers consisting of polyimide oligomers having ethynyl terminated end groups coreacted with a di- or polyethynyl- substituted diluent or mixtures of such diluents and a reinforcing fabric, filter or chopped fiber.
Claim 10
Dependent Claim
46 words
The composite materials of claim 7 where said oligomer is comprised of the following general structure: ##STR11## n = 0 to 5, m = 0 to 5, and x = O, S, CH 2 , CO, SO 2 , ##STR12## or --CF 2 -O-CF 2 --.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |