Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Stratified or layered articles
Patent
1990-12-07
1992-06-30
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Stratified or layered articles
264126, 264135, 264136, 264257, 26433112, 26433119, 264347, B29B 1116
Patent
active
051260859
ABSTRACT:
A process for making polyimide sheet molding compounds which involves the preparation of a polyimide precursor solution of adjusted viscosity that includes a mixture of high and low boiling alcohols, and which also includes monomeric reactants including a diester of an aromatic dianhydride, an aromatic diamine, a monoester of norbornene dianhydride, the reactants being present in a relative molar ratio selected to yield a polyimide having a desired molecular weight. The solution, which further contains particular amounts of staple reinforcing fibers is deposited as a sheet between two carrier film layers and is partially dried to remove the low boiling alcohols. The molecular weight of the polyimide and the amount of any insoluble components present in the solution are controlled so that when the sheet molding compound is imidized under particular heating conditions, its melt viscosity will allow the melted polyimide to retain the staple fibers present therein uniformly distributed throughout the melt as it flows throughout molds into which the sheet molding compounds are placed.
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Reardon Joseph P.
Thorp John D.
Dexter Composites, Inc.
Hochberg D. Peter
Kusner Mark
Thurlow Jeffery
Weisz Louis J.
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