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US 4,283,361 AGranted
Preparation of shaped articles of poly(metaphenylene isophthalamide)
AssigneeE. I. Du Pont de Nemours and Company
InventorRuskin Longworth
Life of this patent
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Abstract
Process for the preparation of shaped articles of poly(metaphenylene isophthalamide) by simultaneously heating poly(metaphenylene isophthalamide) and applying moderately elevated pressures.
Claims7
A process for the preparation of shaped articles having a tensile strength of at least about 14,800 psi from coalescible and densifiable powder of poly(methaphenylene isophthalamide) by heating the powder in a mold of the desired configuration to a temperature of about from 265.degree. to 320.degree. C. while simultaneously maintaining the powder under a pressure of about from 100 to 2500 psi.
Dependencies are inferred from the claim text.