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US 4,358,581 AGranted
Polyimide manufacture
AssigneeE. I. Du Pont de Nemours and Company
InventorRichard F. Sutton, Jr.
Life of this patent
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Abstract
A process is disclosed for manufacturing high molecular weight polyimide from a chilled solution which includes a polyamide acid prepolymer, a finishing component, and a converting system wherein, when the solution is heated, polyamide acid polymer is formed and converted to polyimide.
Claims12
A process for manufacturing a high molecular weight polyimide comprising the steps of
- (a) establishing a polymerization solution of
- (i) polyamide acid prepolymer,
- (ii) a finishing component polymerizable with the prepolymer to yield polyamide acid polymer, and
- (iii) a conversion system to convert polyamide acid polymer to polyimide polymer, the temperature of the solution being maintained below the polyamidization temperature and
- (b) warming the solution to cause polymerization of the prepolymer and the finishing component
- whereby, as the prepolymer is polymerized with the finishing component, it is converted, by the conversion system, into high molecular weight polyimide.
3 more elements
Dependencies are inferred from the claim text.