John D Thorp

US Patent:

51260859, Jun 30, 1992

Filed:

Dec 7, 1990

Appl. No.:

7/624332

Inventors:

John D. Thorp - Chagrin Falls OH
Joseph P. Reardon - Fairview Park OH

Assignee:

Dexter Composites, Inc. - Cleveland OH

International Classification:

B29B 1116

US Classification:

264112

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.

Address:

13245 S Us Hwy 191, Jackson, WY 83001

Phone:

(307)6902002

VIN:

1C4RJFBT0CC316497

Make:

JEEP

Model:

GRAND CHEROKEE

Year:

2012