US4255483A
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Fire barrier compositions and composites
Assignee: McDonnell Douglas Corp
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Filing: 1977-06-14
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Granted: 1981-03-10
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Expires: 1997-06-14
Abstract
Abstract Fire barrier composition particularly applicable as an acoustic panel-fire wall structure in aircraft, capable of withstanding a 2,000° F. flame temperature, comprising incorporating a silica-containing material such as silicic acid or the reaction product of silicic acid and maleic anhydride, into a resin, particularly a polyimide resin. The resulting silica-containing resin, e.g. silicic acid-filled polyimide, is then applied to a substrate such as graphite fiber or glass cloth, to form a composite structure, which is then cured. The resulting cured composite when subjected to high temperature, e.g. a 2,000° F. flame temperature, forms silicon carbide and/or silicon nitride, in situ, which stabilizes any char that forms.
Inventors
- 👤 Norman R. Byrd
- 👤 John K. Donahoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:09
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/123; D01F11/14; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31511; Y10T428/31525; Y10T428/31529; Y10T428/31551; Y10T428/31623; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2721
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
58 words
A fire resistant composition having low thermal conductivity, comprising a cured mixture of a resin selected from the group consisting of polyimide, epoxy, polybenzimidazole, polyquinoxyline, phenolic and silicone resins; and the reaction product of silicic acid and an anhydride, employing about 10 to about 80 parts of said reaction product per 100 parts of resin solids, by weight.
Claim 2
Dependent Claim
58 words
A fire resistant composition having low thermal conductivity, comprising a cured mixture of a resin selected from the group consisting of polyimide, epoxy, polybenzimidazole, polyquinoxyline, phenolic and silicone resins; and the reaction product of silicic acid and an anhydride, employing about 10 to about 80 parts of said reaction product per 100 parts of resin solids, by weight.
Claim 3
Dependent Claim
15 words
A fire resistant composition as defined in claim 1, said resin being a polyimide resin.
Claim 4
Dependent Claim
17 words
A fire resistant composition as defined in claim 1, said resin being a condensation type polyimide resin.
Claim 5
Dependent Claim
17 words
A fire resistant composition as defined in claim 1, said resin being an addition type polyimide resin.
Claim 6
Dependent Claim
22 words
A fire resistant composition as defined in claim 2, said reaction product being the reaction product of silicic acid and maleic anhydride.
Claim 7
Dependent Claim
35 words
A fire resistant composition as defined in claim 5, employing about 16 to about 50 parts silicic acid and about 10 to about 60 parts maleic anhydride, per 100 parts of resin solids, by weight.
Claim 8
Dependent Claim
28 words
A fire resistant composition as defined in claim 1, said composition when subjected to a flame temperature of 2,000° F. forming silicon carbide and/or silicon nitride in situ.
Claim 9
Dependent Claim
28 words
A fire resistant composition as defined in claim 2, said composition when subjected to a flame temperature of 2,000° F. forming silicon carbide and/or silicon nitride in situ.
Claim 10
Dependent Claim
81 words
A fire resistant composite having low thermal conductivity, comprising a substrate selected from the group consisting of graphite fabric and glass fabric, impregnated with a composition comprising a cured mixture of a resin selected from the group consisting of polyimide, epoxy, polybenzimidazole, polyquinoxyline, phenolic and silicone resins; and the reaction product of silicic acid and an anhydride, said reaction product being present in an amount ranging from about 10 to about 80 parts, per 100 parts of resins solids, by weight.
Claim 11
Dependent Claim
81 words
A fire resistant composite having low thermal conductivity, comprising a substrate selected from the group consisting of graphite fabric and glass fabric, impregnated with a composition comprising a cured mixture of a resin selected from the group consisting of polyimide, epoxy, polybenzimidazole, polyquinoxyline, phenolic and silicone resins; and the reaction product of silicic acid and an anhydride, said reaction product being present in an amount ranging from about 10 to about 80 parts, per 100 parts of resins solids, by weight.
Claim 12
Dependent Claim
15 words
A fire resistant composite as defined in claim 9, said resin being a polyimide resin.
Claim 13
Dependent Claim
22 words
A fire resistant composite as defined in claim 10, said reaction product being the reaction product of silicic acid and maleic anhydride.
Claim 14
Dependent Claim
47 words
A fire resistant composite as defined in claim 11, said silicic acid being employed in amount ranging from about 16 to about 50 parts, and said maleic anhydride being employed in amount ranging from about 10 to about 60 parts, per 100 parts resin solids, by weight.
Claim 15
Dependent Claim
30 words
A fire resistant composite as defined in claim 10, said composite when subjected to flame temperature of 2,000° F. forming silicon carbide and/or silicon nitride in situ in said composition.
Claim 16
Dependent Claim
35 words
A fire resistant composition as defined in claim 5, employing about 26 to about 47 parts silicic acid and about 32 to about 59 parts maleic anhydride, per 100 parts of resin solids, by weight.
Claim 17
Dependent Claim
49 words
A fire resistant composite as defined in claim 11, said silicic acid being employed in an amount ranging from about 26 to about 47 parts, and said maleic anhydride being employed in an amount ranging from about 32 to about 59 parts, per 100 parts resin solids, by weight.
Claim 18
Dependent Claim
58 words
A fire resistant composition having low thermal conductivity, comprising a cured mixture of a resin selected from the group consisting of polyimide, epoxy, polybenzimidazole, polyquinoxyline, phenolic and silicone resins; and the reaction product of silicic acid and maleic anhydride, employing about 10 to about 80 parts of said reaction product per 100 parts of resin solids by weight.
Claim 19
Dependent Claim
58 words
A fire resistant composition having low thermal conductivity, comprising a cured mixture of a resin selected from the group consisting of polyimide, epoxy, polybenzimidazole, polyquinoxyline, phenolic and silicone resins; and the reaction product of silicic acid and maleic anhydride, employing about 10 to about 80 parts of said reaction product per 100 parts of resin solids by weight.
Claim 20
Dependent Claim
86 words
A fire resistant composite having low thermal conductivity, comprising a substrate selected from the group consisting of graphite fabric, glass fabric and a low melting point metal, having applied thereto a composition comprising a cured mixture of a resin selected from the group consisting of polyimide, epoxy, polybenzimidazole, polyquinoxyline, phenolic and silicone resins; and the reaction product of silicic acid and an anhydride, said reaction product being present in an amount from about 10 to about 80 parts, per 100 parts of resin solids, by weight.
Claim 21
Dependent Claim
86 words
A fire resistant composite having low thermal conductivity, comprising a substrate selected from the group consisting of graphite fabric, glass fabric and a low melting point metal, having applied thereto a composition comprising a cured mixture of a resin selected from the group consisting of polyimide, epoxy, polybenzimidazole, polyquinoxyline, phenolic and silicone resins; and the reaction product of silicic acid and an anhydride, said reaction product being present in an amount from about 10 to about 80 parts, per 100 parts of resin solids, by weight.
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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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |