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Primary Examiner: Esposito, Michael F.
Assistant Examiner: Childs, Sadie L.
Attorney: Del Ponti; John D.

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Title: Low pressure process for producing substantially voidless composites

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.

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Inventors: Paul, Roy D. (Windsor, CT, US)
Winiarski, Henry C. (Hartford, CT, US)

Application Number: 864941
Filing Date: 1977-12-27
Publication_date: 1980-04-08
Assignee: United Technologies Corporation (Hartford, CT)
Primary Class(es): 427/370 427/374.6, 528/344, 528/353
Other Classes:
US Patent Ref:

3575923	Apr, 1971	Jones	260/65.
3654227	Apr, 1972	Dine-Hart	260/65.
3708458	Jan, 1973	Alberino et al.	260/65.
3745149	Jul, 1973	Serafini et al.	260/65.
3930091	Dec, 1975	Alberino et al.	427/370.

Other Refs: Other References: 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