# US 11,898,273 B2 · Solvent-spun cellulosic fiber

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- Number: US 11,898,273 B2
- Document ID: US11898273B2
- Status: Granted
- Kind: B2
- Application number: 16/978,253
- Filed: 2019-03-05
- Published: 2020-12-31
- Granted: 2024-02-13
- Earliest claimed: 2018-03-06
- Assignees: Lenzing Aktiengesellschaft
- Applicants: Lenzing Aktiengesellschaft
- Inventors: Verena Silbermann; Martina Opietnik
- Web page: https://patentgrep.com/patent/US11898273B2

## CPC

- D01F 2/00: Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F 2/08: Composition of the spinning solution or the bath
- D01F 1/10: Other agents for modifying properties
- D21H 13/08: from regenerated cellulose
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR

## 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 more b) the fiber is characterized by the 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 and 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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

### Claim 5 (depends on 4)

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

### Claim 6 (depends on 5)

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

### Claim 7 (depends on 3)

The fiber according to claim 3, wherein the matting agent is selected from the group consisting of TiO2, CaCO3, ZnO, kaolin, talc, fumed silica, BaSO4, and mixtures thereof.

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 8)

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

### Claim 10 (depends on 1)

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

### Claim 11 (depends on 1)

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

### Claim 12 (depends on 1)

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

### Claim 13 (depends on 12)

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

### Claim 14 (depends on 13)

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

### Claim 15 (depends on 14)

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

### Claim 16 (depends on 13)

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

### Claim 17 (depends on 1)

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