Patent ID: 9631298
Date: 2017-04-25
CPC Classifications: B29C,B29D,B29K,B29L,C08L,D01D,D01F

Claim:
1. A method for the production of a lignin-containing precursor fibre for the production of carbon fibres and/or activated carbon fibres, comprising a) forming a solution, comprising at least one variety of lignin and also at least one fibre-forming polymer selected from the group consisting of cellulose or cellulose derivatives, in at least one solvent selected from the group consisting of tertiary amine oxides, and mixtures thereof, and b) transferring the solution into a coagulation bath by extruding the solution through a spinning nozzle by a wet spinning or an air-gap spinning method to form the lignin-containing precursor fibre, wherein the lignin-containing precursor fibre precipitates when the solution is extruded, and c) stretching the lignin-containing precursor fibre to at least 1.1 times its length, at a temperature of at least 60° C. in the coagulation bath, in air, or in water vapour.