Patent ID: 7754797
Filing Date: 2010-07-13
Classification: C08J,C08L,D01F,D21H

Abstract:
1. A para-aramid pulp-like fiber derived from an anisotropic non-fibrous polymer solution, the solution comprising: 1-6wt. % para-aramid, which has to a maximum of 50 mole % of substituted aromatic diamines and to a maximum of 50 mole % of substituted aromatic dicarboxylic acid halide, a polar amide solvent selected from the group consisting of N-methyl-2-pyrrolidone, N,N′ dimethylformamide, N,N′-dimethylacetamide, tetramethylurea, ad mixtures thereof; an alkali or an alkaline earth metal chloride, in an amount of from 0.7 mole per mole of amide groups of the para-aramid, to 7.5 wt. % of the solution; and water; wherein: at least 50 wt. % of formed hydrochloric acid is neutralized, the solution does not comprise hex amethylphophoramide (HMPA), the para-aramid pulp-like fiber is directly obtained without forming a yarn by spinning the solution through a nozzle into a low pressure zone whereby the solution is broken into droplets by contacting the solution with an air jet, followed by orienting the droplets by contacting the solution with an air jet, followed by orienting the droplets and coagulating the droplets in the low pressure zone by means of applying a coagulant jet.