Polysaccharide fibers and method for producing same

Patent metadata

Field	Value
Publication number	US-10876225-B2
Application number	US-201815980140-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	Jun 17, 2013
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

The present invention relates to a method for the production of polysaccharide fibers which contain α(1→3)-glucan as a fiber-forming substance, as well as to the fibers made thereby, and to their use.

First claim

What is claimed is:

1. A method of producing a polysaccharide fiber whose fiber-forming substance is α(1→3)-glucan, wherein the method comprises:
(i) preparing a spinning solution comprising α(1→3)-glucan, sodium hydroxide, and carbon disulfide (CS 2 ), wherein there is about 5% to about 7.5% by weight CS 2 relative to the α(1→3)-glucan, and
(ii) extruding the spinning solution to produce the polysaccharide fibers.

2. The method according to claim 1 , wherein at least 90% of the α(1→3)-glucan are hexose units and at least 50% of the hexose units are linked via α(1→3)-glycosidic bonds.

3. The method according to claim 1 , wherein the fiber is a staple fiber or a continuous filament.

4. The method according to claim 1 , wherein step (i) comprises first preparing a solution comprising the α(1→3)-glucan and the sodium hydroxide, and then admixing the CS 2 to prepare the spinning solution.

5. The method according to claim 1 , further comprising (iii) stretching the polysaccharide fiber.

6. The method according to claim 1 , wherein the weight-average degree of polymerization (DPw) of the α(1→3)-glucan is between 200 and 2000.

7. The method according to claim 6 , wherein the DPw of the α(1→3)-glucan is between 500 and 1000.

Assignees

• Dupont Ind Biosciences Usa Llc

Inventors

• Kraft Gregor
• Kroner Gert
• Röder Thomas
• Firgo Heinrich

Classifications

• C08B37/0009 Primary

  alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof · CPC title

• D21H13/00

  Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material (chemical features in the manufacture of artificial fibres D01F) · CPC title

• D01F2/06 Primary

  from viscose · CPC title

• A61L15/28

  Polysaccharides or their derivatives {(A61L15/225 takes precedence)} · CPC title

• C08L5/00

  Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00 · CPC title