Fire resistant compositions and composites

Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond

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427386, 427387, 4273855, 4274073, 4273898, 428268, 428490, 524 84, 524100, 524111, 524, B32B 2738, B32B 2736, B32B 2734, B32B 2730, B32B 2728, B32B 2718, C08K 553, C08K 550

Patent

active

043649912

ABSTRACT:
Highly fire resistant composites or laminates particularly applicable as structural components in aircraft, e.g. in the engine nacelle, as part of the acoustic panel-fire wall structure, and capable of withstanding a 2,000.degree. F. flame temperature, comprising incorporating an additive in the form of a phosphorylated amide, into a resin, e.g., a polyimide or an epoxy resin, such additive being soluble in the resin. The resulting resin containing the additive, e.g., phenyl phosphonic acid diamide, is then applied to or impregnated into a substrate such as glass fiber cloth or graphite fiber, to form a composite structure which is then cured. The resulting cured composite when subjected to high temperatures of the order of, e.g., a 2,000.degree. F. flame temperature, forms a resin char of reduced thermal conductivity which holds the fibers of the laminate together and maintains the structural stability and integrity of the laminate.

REFERENCES:
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patent: 3224889 (1965-12-01), Schulde et al.
patent: 3449161 (1969-06-01), Hindersinn et al.
patent: 3449308 (1969-06-01), Blatz
patent: 3575891 (1971-04-01), Le Blanc et al.
patent: 3645971 (1972-02-01), Hindersinn
patent: 3971753 (1976-07-01), Frechtling et al.
patent: 4134877 (1979-01-01), Morgan et al.

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