Process for making colored aramid fibers

Details Process for making colored aramid fibers Process for making colored aramid fibers

1990-10-11

1992-05-19

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642103, 2642106, 2642108, 264211, 26421115, 26421116, D01F 104, D01F 660

Patent

active

051146525

ABSTRACT:
Colored, high strength, high modulus p-aramid fibers are prepared by including an organic pigment which is soluble in but not degraded by concentrated sulfuric acid in a p-aramid spinning dope wherein the solvent is concentrated sulfuric acid and spinning the pigment containing dope through an air gap into a coagulation bath and washing and drying the resulting fibers. The dissolved pigment is precipitated by the coagulation bath as particles with a diameter of less than 0.50 microns.

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