US 12,234,577 B2
Process for the manufacture of a precursor yarn
Niklas Garoff, Skarholmen (SE); Robert Protz, Potsdam (DE); Jens Erdmann, Berlin (DE); Johannes Ganster, Potsdam (DE); and Andre Lehmann, Potsdam (DE)
Assigned to Stora Enso OYJ, Helsinki (FI)
Appl. No. 15/766,457
Filed by Stora Enso OYJ, Helsinki (FI)
PCT Filed Oct. 6, 2016, PCT No. PCT/IB2016/055986
§ 371(c)(1), (2) Date Apr. 6, 2018,
PCT Pub. No. WO2017/060845, PCT Pub. Date Apr. 13, 2017.
Claims priority of application No. 1551297-3 (SE), filed on Oct. 8, 2015.
Prior Publication US 2019/0085484 A1, Mar. 21, 2019
Int. Cl. D01F 11/02 (2006.01); C08L 1/02 (2006.01); C08L 97/00 (2006.01); D01F 2/00 (2006.01); D01F 9/00 (2006.01); D01F 9/16 (2006.01); D01F 9/17 (2006.01); D01F 9/22 (2006.01); D01F 11/00 (2006.01); D06M 13/127 (2006.01); D06M 13/144 (2006.01); D06M 13/224 (2006.01); D06M 13/35 (2006.01)
CPC D01F 11/02 (2013.01) [C08L 1/02 (2013.01); C08L 97/005 (2013.01); D01F 2/00 (2013.01); D01F 9/00 (2013.01); D01F 9/16 (2013.01); D01F 9/17 (2013.01); D01F 11/00 (2013.01); D06M 13/127 (2013.01); D06M 13/144 (2013.01); D06M 13/224 (2013.01); D06M 13/35 (2013.01); D01F 9/22 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A method for manufacturing a precursor yarn comprising lignin, comprising:
a) providing cellulose and/or a cellulose derivative,
b) providing lignin and/or a lignin derivative,
c) dissolution of the cellulose and/or the cellulose derivative and the lignin and/or the lignin derivative in a solvent followed by subsequent mixing thus providing a dope consisting essentially of the cellulose and/or the cellulose derivative and the lignin and/or the lignin derivative and the solvent,
d) performing a spinning of the dope to a precursor material,
e) applying a water-free spin finish on said precursor material, and
f) drying of said precursor material, thus providing a precursor yarn comprising lignin,
wherein the water-free spin finish in step e) consists essentially of at least one organic solvent with a boiling point lower than that of water, and one or more anti-static agents or one or more anti-friction agents or both, wherein the at least one organic solvent consists essentially of one or more aprotic polar solvent selected from ketoalkyl or ketoalkoxy compounds and has the structure shown below,

OG Complex Work Unit Chemistry
and wherein
R1=H, CH3, O-(CH2)n-CH3; n=0-3,
R2=H, CH3, O-(CH2)n-CH3; n=0-3, and
optionally one or more protic polar solvent, and wherein the water-free spin finish is applied on said precursor material before drying of said precursor material.