Reinforced composites containing unsaturated polyimide resins

Details Reinforced composites containing unsaturated polyimide resins Reinforced composites containing unsaturated polyimide resins

1979-10-22

1981-06-30

Dixon, Jr., William R.

Stock material or miscellaneous articles

Composite

Of polyimide

20415915, 525180, 525183, 525923, 525925, 528322, 428260, B32B 2706, C08F 800, C08G 2310

Patent

active

042763525

ABSTRACT:
Fibrous-reinforced composites, such as prepregs and sheet moulding compounds, are made with a thermosettable unsaturated polyimide resin, a photopolymerizable compound, and a heat-activated curing agent for the resin. Fibers may be impregnated with a liquid mixture of the resin and the photopolymerizable compound, and irradiated to cause the mixture to solidify through photopolymerization. The product, when desired, e.g., after stacking to form a multilayer laminate or after shaping, is heated to cure the resin. Alternatively, the liquid mixture is irradiated to form a solid film, into which the fibers are pressed, and, when required, the assembly is heated to cure the resin. The resins employed contain at least two maleimide, citraconimide, or itaconimide groups linked through nitrogen atoms thereof to carbon atoms.

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