Solvent-spun cellulosic fiber

Patent metadata

Field	Value
Publication number	US-11898273-B2
Application number	US-201916978253-A
Country	US
Kind code	B2
Filing date	Mar 5, 2019
Priority date	Mar 6, 2018
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

The present invention relates to a cellulosic fiber of the lyocell genus. The fiber according to the invention has the following properties:a) the fiber has a content of hemicellulose of 5 wt. % or moreb) the fiber is characterized by the Hoeller factors F1 and F2 as follows:Hoeller factor F1≥0.7+x and ≤1.3+xHoeller factor F2≥0.75+(x*6) and ≤3.5+(x*6)whereinx is 0.5 if the fiber does not contain a matting agent andx is 0 if the fiber does contain a matting agent, andif x is 0.5, the fiber is essentially free from any incorporation agent.

First claim

The invention claimed is:

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.

2. The fiber according to claim 1 , wherein x is 0.5 and wherein
Hoeller factor F1≥1.2 and ≤1.8
Hoeller factor F2≥3.75 and ≤6.5.

3. The fiber according to claim 1 , wherein x is 0 and wherein
Hoeller factor F1≥0.7 and ≤1.3 and
Hoeller factor F2≥0.75 and ≤3.5.

4. The fiber according to claim 3 , comprising from 0.1 wt. % to 10 wt. % of the matting agent.

5. The fiber according to claim 4 , comprising from 0.3 wt. % to 5 wt. % of the matting agent.

6. The fiber according to claim 5 , comprising from 0.5 wt. % to 1 wt. % of the matting agent.

7. The fiber according to claim 3 , wherein the matting agent is selected from the group consisting of TiO 2 , CaCO 3 , ZnO, kaolin, talc, fumed silica, BaSO 4 , and mixtures thereof.

8. The fiber according to claim 1 , having a water retention value (WRV) of from 70% and higher.

9. The fiber according to claim 8 , wherein the water retention value (WRV) is from 75% to 85%.

10. The fiber according to claim 1 , wherein the content of hemicellulose is from 7 wt. % to 50 wt. %.

11. The fiber according to claim 1 , wherein the fiber is obtained by an amine-oxide process.

12. A fiber bundle comprising a plurality of fibers according to claim 1 .

13. The fiber bundle according to claim 12 , comprising at least 20 kg of the fibers.

14. The fiber bundle according to claim 13 , comprising at least 70 kg of the fibers.

15. The fiber bundle according to claim 14 , wherein the fiber is in the form of a fiber bale.

16. The fiber bundle according to claims 13 , wherein the fiber is in the form of a fiber bale.

17. The fiber according to claim 1 , wherein the content of hemicellulose is from 7 wt. % to 25 wt. %.

Assignees

• Chemiefaser Lenzing Ag

Inventors

• Silbermann Verena
• Opietnik Martina

Classifications

• D01F2/08 Primary

  Composition of the spinning solution or the bath · CPC title

• D21H13/08

  from regenerated cellulose · CPC title

• D01F2/00 Primary

  Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof · CPC title

• D01F1/10

  Other agents for modifying properties · CPC title

• D10B2201/00

  Cellulose-based fibres, e.g. vegetable fibres · CPC title