# US 10,501,871 B2 · Method for production of man-made textile yarns from wood fibers

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- Number: US 10,501,871 B2
- Document ID: US10501871B2
- Status: Granted
- Kind: B2
- Application number: 15/713,968
- Filed: 2017-09-25
- Published: 2018-05-10
- Granted: 2019-12-10
- Earliest claimed: 2016-09-28
- Assignees: Lakehead University
- Applicants: Lakehead University
- Inventors: Lew Christopher; MD Nur Alam
- Web page: https://patentgrep.com/patent/US10501871B2

## CPC

- D02G 3/02: Yarns or threads characterised by the material or by the materials from which they are made
- D01D 1/02: Preparation of spinning solutions
- D01F 2/00: Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F 2/02: from solutions of cellulose in acids, bases or salts
- D02G 3/06: Threads formed from strip material other than paper
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS

## Abstract

We have developed an environmentally-friendly new process for producing textile yarns. The process involves chemical modification of cellulose with subsequent dissolution of the chemically modified cellulose with chitosan or other amine group-containing compounds which yields a highly viscous gel. The chemical modification of cellulose employs a known process of periodate oxidation which we have modified to obtain fibers with a low degree of aldehyde groups (˜2 mmol/g cellulose) that still remain insoluble in water. After washing, the chemically modified fibers can be cross-linked with chitosan or other amine group-containing compounds to produce the viscous gel. The viscous gel can then be extruded through a syringe nozzle in the form of textile yarns.

## Claims

### Claim 1

A method of generating a textile yarn comprising:
subjecting a quantity of wood pulp to periodate oxidation;
recovering dialdehyde cellulose;
dissolving the dialdehyde cellulose in sodium hydroxide;
adding an amine-containing compound to the dissolved dialdehyde cellulose;
recovering a cellulose gel;
filtering the cellulose gel;
extruding the filtered cellulose gel into yarn in an acid-containing bath; and
washing the yarn.

### Claim 2 (depends on 1)

The method according to claim 1 wherein the dialdehyde cellulose has a degree of substitution of 0.1 to 0.5.

### Claim 3 (depends on 1)

The method according to claim 1 wherein the sodium hydroxide concentration range is 5-20 wt %.

### Claim 4 (depends on 1)

The method according to claim 1 wherein the dialdehyde cellulose concentration is 5 to 12 w/w %.

### Claim 5 (depends on 1)

The method according to claim 1 wherein the cellulose gel is filtered through pores of 300-500 MESH.

### Claim 6 (depends on 1)

The method according to claim 1 wherein following filtration, the cellulose gel is degassed under vacuum.

### Claim 7 (depends on 1)

The method according to claim 1 wherein the yarn is extruded at a temperature range of between +5° C. to +60° C.

### Claim 8 (depends on 1)

The method according to claim 1 wherein the amine-containing compound is chitosan.

### Claim 9 (depends on 8)

The method according to claim 8 wherein the chitosan is: 1-15 wt % of cellulose.

### Claim 10 (depends on 9)

The method according to claim 9 wherein the chitosan is 5-7 wt % of cellulose.

### Claim 11 (depends on 1)

The method according to claim 1 wherein acid range in the acid-containing bath is 10-20% wt of cellulose.

### Claim 12 (depends on 1)

The method according to claim 1 wherein the acid-containing bath includes H2SO4.