US 11,898,273 B2
Solvent-spun cellulosic fiber
Verena Silbermann, Gampern (AT); and Martina Opietnik, Schörfling a. Attersee (AT)
Assigned to LENZING AKTIENGESELLSCHAFT, Lenzing (AT)
Appl. No. 16/978,253
Filed by LENZING AKTIENGESELLSCHAFT, Lenzing (AT)
PCT Filed Mar. 5, 2019, PCT No. PCT/EP2019/055441
§ 371(c)(1), (2) Date Sep. 4, 2020,
PCT Pub. No. WO2019/170670, PCT Pub. Date Sep. 12, 2019.
Claims priority of application No. 18160308 (EP), filed on Mar. 6, 2018.
Prior Publication US 2020/0407883 A1, Dec. 31, 2020
Int. Cl. D01F 2/08 (2006.01); D21H 13/08 (2006.01)
CPC D01F 2/08 (2013.01) [D21H 13/08 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A cellulosic fiber of the lyocell genus, wherein the fiber has a content of hemicellulose of 5 wt. % to 50 wt. % and the fiber is characterized by Hoeller factors F1 and F2 as follows:
Hoeller factor F1≥0.7+x and ≤1.3+x
Hoeller factor F2≥0.75+(x*6) and ≤3.5+(x*6)
wherein
x is 0.5 if the fiber does not contain a matting agent, x is 0 if the fiber does contain a matting agent, and
if x is 0.5, the fiber is essentially free from any incorporation agent.