Low pressure process for producing substantially voidless compos

Details Low pressure process for producing substantially voidless compos Low pressure process for producing substantially voidless compos

1977-12-27

1980-04-08

Esposito, Michael F.

Coating processes

With post-treatment of coating or coating material

Solid treating member or material contacts coating

4273746, 528322, 528344, 528353, B05D 312

Patent

active

041973399

ABSTRACT:
Filament-reinforced A-type PMR polyimide composites are prepared by mixing known monomers, applying the mixture as a matrix material to a plurality of the filaments, imidizing to obtain a prepolymer having a defined melt temperature range, heating the prepolymer to an addition polymerization temperature to effect cure, applying a pressure of 50-300 psi before reaching cure temperature and while in the melt temperature range, and maintaining said pressure while curing.

REFERENCES:
patent: 3575923 (1971-04-01), Jones
patent: 3654227 (1972-04-01), Dine-Hart
patent: 3708458 (1973-01-01), Alberino et al.
patent: 3745149 (1973-07-01), Serafini et al.
patent: 3930091 (1975-12-01), Alberino et al.
Gibbs, "Low Void Composities Based on NR-150 Polyimide Binders," 1973, The Society of the Plastics Industry, Inc., Section 2-D, pp. 1-12.
Vaughan et al., "Filament Winding S-Glass-Polyimide Resin Composite Processing Studies," Feb. 1974, pp. V, 27 and 28.
Cavano, Resin/Graphite Fiber Composites, NASA CR-121275, Mar. 15, 1974, pp. V, VI and 28.
O'Rell et al., "Development of Autoclavable Polyimides," Nov. 21, 1974, pp. V and VI. Z

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