US4598007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light weight fire resistant graphite composites
Assignee: National Aeronautics and Space Administration
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Filing: 1985-02-28
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Granted: 1986-07-01
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Expires: 2005-02-28
Abstract
Abstract Composite structures having a honeycomb core and characterized by lightweight and excellent fire resistance are provided. These sandwich structures employ facesheets made up of bismaleimide-vinyl styrylpyridine copolymers with fiber reinforcement such as carbon fiber reinforcement. In preferred embodiments the facesheets are over-layered with a decorative film. The properties of these composites make them attractive materials of construction for aircraft and spacecraft.
Inventors
- 👤 Demetrius A. Kourtides
- 👤 John A. Parker
- 👤 Ming-Ta S. Hsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:12
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; B32B27/00; B32B27/06; B32B37/00; B32B37/14; B32B37/146; B32B7/00; B32B7/04; B32B7/12; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365; B32B37/12; B32B37/1207; B32B2037/1215; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2307/70; B32B2307/718; B32B2605/00; B32B2605/18; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
30 words
A lightweight flame resistant composite structure comprising a fire-resistant cellular honeycomb core, having adhered to at least one of its faces a facesheet comprising a reinforced cured vinyl styrylpyridine-bismaleimide copolymer.
Claim 2
Dependent Claim
30 words
A lightweight flame resistant composite structure comprising a fire-resistant cellular honeycomb core, having adhered to at least one of its faces a facesheet comprising a reinforced cured vinyl styrylpyridine-bismaleimide copolymer.
Claim 3
Dependent Claim
19 words
The composite structure of claim 1 wherein only one facesheet is adhered to only one face of the core.
Claim 4
Dependent Claim
16 words
The composite structure of claim 1 wherein facesheets are adhered to both faces of the core.
Claim 5
Dependent Claim
25 words
The composite structure of claim 1 wherein the reinforcement in said facesheet is selected from carbon fiber, boron nitride fiber, glass fiber and aramide fiber.
Claim 6
Dependent Claim
32 words
The composite structure of claim 1 wherein the material of said cellular honeycomb comprises a member of the group consisting of aluminum, aromatic polyamide paper, polyimide dipped aromatic polyamide paper and bismaleimide-fiberglass.
Claim 7
Dependent Claim
115 words
The composite structure of claim 1 wherein said cured vinyl styrylpyridine-bismaleimide copolymer comprises 10 to 1 parts by weight of bismaleimide copolymerized with one part by weight of a vinyl styrylpyridine oligomer of the structure ##STR8## wherein in the A aromatic rings R 1 is hydrogen or a lower alkyl and the two olefin bonds are attached to the aromatic ring meta or para to one another, and in the B aromatic ring R 2 is a lower alkyl, haloalkyl, or alkoxyl and the two olefin bonds are attached to the B aromatic ring in the 2,6 or 2,4 positions, with R 2 in the 4 or 6 position not occupied by an olefin bond.
Claim 8
Dependent Claim
20 words
The composite structure of claim 6 wherein R 1 is hydrogen and R 2 is selected from methyl and methoxy.
Claim 9
Dependent Claim
22 words
The composite structure of claim 7 wherein the reinforcement is selected from carbon fiber, aramide fiber, boron nitride fiber and glass fiber.
Claim 10
Dependent Claim
23 words
The composite structure of claim 8 wherein the weight ratio of bismaleimide to vinyl styrylpyridine oligomer is from about 5:1 to about 1.5:1.
Claim 11
Dependent Claim
15 words
The composite structure of claim 6 wherein said facesheet additionally comprises an adhered decorative overlayer.
Claim 12
Dependent Claim
22 words
The composite structure of claim 10 wherein the reinforcement is selected from carbon fiber, aramide fiber, boron nitride fiber and glass fiber.
Claim 13
Dependent Claim
13 words
The composite structure of claim 10 wherein said decorative overlayer comprises polyether etherketone.
Claim 14
Dependent Claim
153 words
A lightweight flame resistant composite structure comprising an aromatic polyamide honeycomb core having adhered to each of its faces a facesheet comprising a cured reinforced vinyl styrylpyridinebismaleimide copolymer comprises 10 to 1 parts by weight of bismaleimide copolymerized with one part by weight of a vinyl styrylpyridine oligomer of the structure ##STR9## wherein in the A aromatic rings R 1 is hydrogen or a lower alkyl and the two olefin bonds are attached to the aromatic ring meta and para to one another, and in the B aromatic ring R 2 is a lower alkyl, haloalkyl, or alkoxyl and the two olefin bonds ae attached to the B aromatic ring in the 2,6 or 2,4 positions, with R 2 in the 4 or 6 position not occupied by an olefin bond reinforced with carbon fibers and adhered to the outside of at least one of said facesheets a polyether ether ketone decorative oversheet.
Claim 15
Dependent Claim
153 words
A lightweight flame resistant composite structure comprising an aromatic polyamide honeycomb core having adhered to each of its faces a facesheet comprising a cured reinforced vinyl styrylpyridinebismaleimide copolymer comprises 10 to 1 parts by weight of bismaleimide copolymerized with one part by weight of a vinyl styrylpyridine oligomer of the structure ##STR9## wherein in the A aromatic rings R 1 is hydrogen or a lower alkyl and the two olefin bonds are attached to the aromatic ring meta and para to one another, and in the B aromatic ring R 2 is a lower alkyl, haloalkyl, or alkoxyl and the two olefin bonds ae attached to the B aromatic ring in the 2,6 or 2,4 positions, with R 2 in the 4 or 6 position not occupied by an olefin bond reinforced with carbon fibers and adhered to the outside of at least one of said facesheets a polyether ether ketone decorative oversheet.
Claim 16
Dependent Claim
18 words
The structure of claim 13 wherein the facesheets are adhered to the core with a polymerizable polyimide adhesive.
Claim 17
Dependent Claim
17 words
The structure of claim 13 wherein the facesheets are adhered to the core with vinyl styrylpyridine-bismaleimide copolymer.
Claim 18
Dependent Claim
25 words
The structure of claim 13 wherein the vinyl styrylpyridine-bismaleimide copolymer additionally comprises from about 5% to about 20% by weight of an aromatic epoxy modifier.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |