Patent ID: 9580863
Date: 2017-02-28
CPC Classifications: D01D,D01F,D06M,Y02P

Claim:
1. A process for reducing the content of one or more residuals in aramid fibers or filaments, comprising, in this order, the steps of a. introducing the aramid fibers or filaments into a extraction solution being free of any coloring ingredient and adjusted to a pH ranging of from 2 to 7, b. adjusting the extraction solution and the aramid fibers or filaments to a temperature of from 80° C. to 140° C. c. removing the aramid fibers or filaments from the extraction solution d. introducing the aramid fibers or filaments into a first rinsing solution adjusted to a pH ranging of from 2 to 7, e. optionally comprising a detergent, f. adjusting the first rinsing solution and the aramid fibers or filaments to a temperature of from 70° C. to 100° C., g. removing the aramid fibers or filaments from the first rinsing solution, wherein the process provides aramid fibers or filaments having 0.01 to 0.2 weight percent orthodichlorobenzene; N-methyl-2-pyrrolidone(NMP); 1,3-Dimethyl-2-Imidazolidinone(DMI); or N,N-dimethylacetamide (DMAC).