Patent US4526925A successfully refreshed from Google Patents.
US4526925A
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US
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Copolymers of vinyl styrlpyridines or vinyl stilbazoles with bismaleimide
Assignee: UNITED STATES GOVERNMENT OF AMERICA NASA (NASA), Administrator of
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Filing: 1983-11-18
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Granted: 1985-07-02
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Expires: 2003-11-18
Abstract
Abstract Vinyl pyridines including vinyl stilbazole materials and vinyl styrylpyridine oligomer materials are disclosed. These vinylpyridines form copolymers with bismaleimides which copolymers have good fire retardancy and decreased brittleness. The cure temperatures of the copolymers are substantially below the cure temperatures of the bismaleimides alone. Reinforced composites made from the cured copolymers are disclosed as well.
Inventors
- 👤 John A. Parker
- 👤 Alvin H. Heimbuch
- 👤 Ming-Ta S. Hsu
- 👤 Timothy S. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:43
CPC Classifications
C; C08; C08F; C08F226/00; C08F226/06; C08F222/00; C08F222/36; C08F222/40; C08F222/406
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
56 words
A cured copolymeric resin comprising 15 to 1.0 parts by weight of bismaleimide copolymerized with one part by weight of a 5-vinyl-2-stilbazole of the structure ##STR14## wherein R and R 1 are independently selected from the group consisting of hydrogen, lower alkyls, lower alkoxies, phenyl, alkyl phenyls of 7 to 9 carbons, chloro, bromo and iodo.
Claim 2
Dependent Claim
56 words
A cured copolymeric resin comprising 15 to 1.0 parts by weight of bismaleimide copolymerized with one part by weight of a 5-vinyl-2-stilbazole of the structure ##STR14## wherein R and R 1 are independently selected from the group consisting of hydrogen, lower alkyls, lower alkoxies, phenyl, alkyl phenyls of 7 to 9 carbons, chloro, bromo and iodo.
Claim 3
Dependent Claim
11 words
The cured copolymeric resin of claim 1 wherein R is hydrogen.
Claim 4
Dependent Claim
12 words
The cured copolymeric resin of claim 2 wherein R 1 is hydrogen.
Claim 5
Dependent Claim
23 words
The cured copolymeric resin of claim 3 comprising 10 parts to 2 parts by weight of bismaleimide per part by weight of vinylstilbazole.
Claim 6
Dependent Claim
109 words
A cured copolymeric resin comprising 15 to 1.0 parts by weight of bismaleimide copolymerized with one part by weight of a vinyl styrylpyridine oligomer of the structure ##STR15## 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 7
Dependent Claim
109 words
A cured copolymeric resin comprising 15 to 1.0 parts by weight of bismaleimide copolymerized with one part by weight of a vinyl styrylpyridine oligomer of the structure ##STR15## 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
12 words
The cured copolymeric resin of claim 5 wherein R 1 is hydrogen.
Claim 9
Dependent Claim
12 words
The cured copolymeric resin of claim 5 wherein R 2 is methyl.
Claim 10
Dependent Claim
12 words
The cured copolymeric resin of claim 7 wherein R 1 is hydrogen.
Claim 11
Dependent Claim
24 words
The cured copolymeric resin of claim 8 comprising 10 parts to 2 parts by weight of bismaleimide per part by weight of vinyl styrylpyridine.
Claim 12
Dependent Claim
24 words
The cured copolymeric resin of claim 9 wherein the two olefin bonds are attached to the B aromatic ring in the 2, 6 positions.
Claim 13
Dependent Claim
24 words
The cured copolymeric resin of claim 9 wherein the two olefinic bonds are attached to the B aromatic ring in the 2, 4 positions.
Claim 14
Dependent Claim
17 words
The cured copolymeric resin of claim 5 wherein R 2 is methoxy and R 1 is hydrogen.
Claim 15
Dependent Claim
23 words
The cured copolymeric resin of claim 12 comprising 10 parts to 2 parts by weight of bismaleimide per part by weight of vinylstyrylpyridine.
Claim 16
Dependent Claim
24 words
The cured copolymeric resin of claim 13 wherein the two olefinic bonds are attached to the B aromatic ring in the 2, 6 positions.
Claim 17
Dependent Claim
24 words
The cured copolymeric resin of claim 9 wherein the two olefinic bonds are attached to the B aromatic ring in the 2, 4 positions.
Claim 18
Dependent Claim
28 words
A reinforced resin composite comprising 0.5 to 5 parts by weight of reinforcing fiber dispersed in one part by weight of the cured copolymeric resin of claim 1.
Claim 19
Dependent Claim
14 words
The reinforced resin composite of claim 16 wherein the reinforcing fiber comprises carbon fiber.
Claim 20
Dependent Claim
14 words
The reinforced resin composite of claim 16 wherein the reinforcing fiber comprises aramide fiber.
Claim 21
Dependent Claim
26 words
A reinforced resin composite comprising 0.5 to 5 parts by weight of reinforcing fiber dispersed in one part of the cured copolymeric resin of claim 5.
Claim 22
Dependent Claim
14 words
The reinforced resin composite of claim 19 wherein the reinforcing fiber comprises carbon fiber.
Claim 23
Dependent Claim
14 words
The reinforced resin composite of claim 19 wherein the reinforcing fiber comprises aramide fiber.
Claim 24
Dependent Claim
28 words
A reinforced resin composite comprising 0.5 to 5 parts by weight of reinforcing fiber dispersed in one part by weight of the cured copolymeric resin of claim 4.
Claim 25
Dependent Claim
28 words
A reinforced resin composite comprising 0.5 to 5 parts by weight of reinforcing fiber dispersed in one part by weight of the cured copolymeric resin of claim 9.
Claim 26
Dependent Claim
28 words
A reinforced resin composite comprising 0.5 to 5 parts by weight of reinforcing fiber dispersed in one part by weight of the cured copolymeric resin of claim 13.
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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) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |