Low density bismaleimide-carbon microballoon composites

Details Low density bismaleimide-carbon microballoon composites Low density bismaleimide-carbon microballoon composites

1977-03-16

1979-01-16

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Honeycomb-like

156331, 428119, 428 73, 428458, 428375, B32B 312

Patent

active

041350197

ABSTRACT:
A process for the preparation of composite laminate structures of glass cloth preimpregnated with polybismaleimide resin and adhered to a polybismaleimide glass or aromatic polyamide paper honeycomb cell structure filled or partially filled with a syntactic foam consisting of a mixture of bismaleimide resin and carbon microballoons.
The carbon microballoons are prepared by pyrolyzing phenolic microballons and subsequently bonded using a 2% bismaleimide solution. The laminate structures are cured for two hours at 477.degree. K and are ahered to the honeycomb bismaleimide adhesive using a pressure of 700kN/m.sup.2 pressure at 450.degree. K. The laminate composite is then post-cured for two hours at 527.degree. K to produce a composite laminate having a density in the range from about 95 kilograms per cubic meter to 130 kilograms per cubic meter.

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patent: 3518219 (1970-06-01), Lavin et al.
patent: 3562223 (1971-02-01), Bargain et al.
patent: 3575756 (1971-04-01), Maus
patent: 3759779 (1973-09-01), Dumas
patent: 3811997 (1974-05-01), Yuan

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