Process for making para-aramid fibers having high tenacity and m

Details Process for making para-aramid fibers having high tenacity and m Process for making para-aramid fibers having high tenacity and m

1990-12-27

1992-12-29

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

264184, 2642108, 2642905, 264 25, C08G 6926, B29C 3502, D01F 682, D01P 1006

Patent

active

051752395

ABSTRACT:
A process is disclosed for heating never-dried para-aramid fibers containing 20 to 200 wt % water, based on dry polymer weight to form a fiber having a modulus of greater than 800 gpd while retaining a high tenacity. The fibers are heated in one or more microwave resonant cavity applicators to a temperature of 250.degree. C. to 425.degree. C. and preferably 270.degree. C. to 310.degree. C. while under a tension of 0.2 to 10 grams per denier. The preferred para-aramid is poly(p-phenylene terephthalamide). Fibers having a density of less than 1.43 g/cc can be made; and fibers having moduli greater than 1100 gpd can be made.

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