Air gap spinning process for aramids
AssigneeE. I. Du Pont de Nemours and Company
InventorsSteven D. Ittel, Hsiang Shih
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Abstract
An improved process for spinning aramids from solution using the air gap wet spinning method involves using a coagulant that contains 1 to 1000 ppm by weight of an organic polymer that acts as a drag reducer. Improved productivity and/or finer aramid fibers is obtained with no deterioration of fiber physical properties.
Claims16
A process for the air gap spinning of an aramid fiber from an aramid solution wherein a solution of an aramid polymer is forced through an orifice, then travels through a layer of gas into a coagulant to form an aramid polymer fiber, wherein the improvement comprises, an aqueous coagulant which contains from 1 ppm to about 1,000 ppm by weight of an organic polymer which acts as a drag reducer, provided that said organic polymer is soluble in said coagulant and has a molecular weight of 200,000 or more.
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