Patent ID: 8952146
Filing Date: 2015-02-10
Classification: D01D,D01F

Abstract:
1. A process for producing low fibrillating cellulose fibers by a dry-jet-wet spinning process comprising the following steps: a. dissolving cellulose in a solvent system containing at least one ionic liquid to form a polymer solution wherein the ionic liquid has cations with heterocyclic ring system containing either one or two nitrogen atoms, with each such nitrogen atom substituted by an alkyl group having 1 to 20 carbon atoms, and anions being at least one selected from the group consisting of carboxylate anion of formula Ra—COO b. spinning fibers from said polymer solution in a spinneret at a temperature in the range of 80° C. to 140° C.; c. drawing the spun fibers from the spinneret through an air gap of 2 mm to 50 mm, wherein the draw ratio is between 0.5 and 5.0, into a coagulation bath consisting essentially of 20 to 70% by weight of said ionic liquid and at least 30% by weight of a protic solvent selected from water, methanol, ethanol, glycerol, n-propanol, iso-propanol and mixtures thereof; and d. washing and drying the drawn fibers.