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US 5,330,698 AGranted
Process for making high elongation PPD-T fibers
AssigneeE. I. Du Pont de Nemours and Company
InventorsSteven R. Allen, David M. Harriss
Life of this patent
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Abstract
A process for making a PPD-T fiber having an elongation to break of greater than 7%.
Claims6
A process for making a textile quality para-aramid fiber with an elongation at break greater than 7%, comprising:
- (a) forming a spinning solution of 10 to 14 weight percent poly(p-phenylene terephthalamide) having an inherent viscosity of up to 4 dl/g in sulfuric acid of at least 90% concentration;
- (b) extruding the solution through capillaries in a spinneret, through a layer of inert non-coagulating fluid, and into an aqueous coagulating liquid to yield fibers;
- and
- (c) maintaining separation of the fibers through the coagulating liquid and maintaining the temperature of the coagulating liquid at a temperature of from 40 to 80 degrees C.
1 more element
Dependencies are inferred from the claim text.