	US 12,247,321 B2
	Process for the preparation of polymer fibers from polymers dissolved in ionic liquids by means of an air gap spinning process
Falko Abels, Roemerberg (DE); Tomasz Cwik, Mannheim (DE); Ronald Beyer, Winnenden (DE); and Frank Hermanutz, Leonberg (DE)
Assigned to Technikum Laubholz GmbH, Göppingen (DE)
Filed by Deutsche Institute fur Textil-und Faserforschung, Denkendorf (DE)
Filed on Jan. 18, 2023, as Appl. No. 18/098,606.
Application 18/098,606 is a continuation of application No. 16/077,344, granted, now 11,585,015, previously published as PCT/EP2017/052078, filed on Feb. 1, 2017.
Claims priority of application No. 1615524 (EP), filed on Feb. 11, 2016.
Prior Publication US 2023/0228002 A1, Jul. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. D01D 5/06 (2006.01); D01F 2/00 (2006.01); D01F 2/02 (2006.01)

CPC D01D 5/06 (2013.01) [D01F 2/00 (2013.01); D01F 2/02 (2013.01)]

17 Claims

1. A process for the production of cellulose fibers from polymers dissolved in ionic liquids by means of an air gap spinning process, the process comprising:

a) preparing a spinning solution by:

a1) producing a heterogenous mixture of cellulose, a non-solvent which does not or only partially dissolves the cellulose, and an ionic liquid, and

a2) distilling off the non-solvent,

wherein the spinning solution contains per 100 parts by weight of ionic liquid, 0.1 to 1 parts by weight of water and 10 to 14 parts by weight of cellulose,

b) guiding the spinning solution of a2 through an extruder before it is divided into fibers via a die, and

c) guiding the fibers via an air gap through a coagulation bath.