Polysaccharide fibers and method for producing same

Patent metadata

Field	Value
Publication number	US-2016177471-A1
Application number	US-201414899225-A
Country	US
Kind code	A1
Filing date	Jun 13, 2014
Priority date	Jun 18, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

The present invention relates to a direct dissolving process for the production of polysaccharide fibers which contain α(1→3)-glucan as a fiber-forming substance, with aqueous sodium hydroxide solution as a solvent, as well as to the fibers made thereby, and to their use.

First claim

1 . A method for the production of a polysaccharide fiber whose fiber-forming substance is α(1→3)-glucan, wherein the method is a direct dissolving process which comprises the step of spinning the fiber by extruding a spinning solution comprising an aqueous sodium hydroxide solution, wherein the spinning occurs in a spin bath, and wherein a spun fiber is formed.

2 . The method according to claim 1 , wherein the aqueous sodium hydroxide solution concentration in the spinning solution is between 4.0 and 5.5% by weight related to the total quantity of the spinning solution.

3 . The method according to claim 1 , wherein the spin bath comprises H 2 SO 4 in a concentration between 200 and 500 g/l.

4 . The method according to claim 1 , wherein the H 2 SO 4 concentration in the spin bath is between 20 and 60 g/l.

5 . The method according to claim 1 , wherein the spun fiber is subsequently stretched in an acid regeneration bath.

6 . 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.

7 . The method according to claim 1 , 2 , 3 , 4 , 5 , or 6 , wherein the fiber is selected from the group consisting of a staple fiber and a continuous filament.

8 . A polysaccharide fiber whose fiber-forming substance is α(1→3)-glucan, wherein the fiber is produced using a direct dissolving process in aqueous sodium hydroxide solution.

9 . The fiber according to claim 8 , 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.

10 . The fiber according to claim 8 or 9 , wherein the fiber is selected from the group consisting of a staple fiber and a continuous filament.

11 . A textile product comprising the fiber according to claim 8 , wherein the textile product is selected from the group consisting of yarns, woven fabrics, and knitted fabrics.

12 . A product comprising the fiber according to claim 8 , wherein the product is selected from the group consisting of nonwovens, hygiene products and knitted fabrics.

13 . The textile product according to claim 11 , wherein the fiber is selected from the group consisting of a staple fiber and a continuous filament.

14 . The product according to claim 12 , wherein the fiber is selected from the group consisting of a staple fiber and a continuous filament.

15 . The product according to claim 12 , wherein the hygiene products are selected from the group consisting of tampons, panty liners and diapers.

Assignees

• Chemiefaser Lenzing Ag

Inventors

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

Classifications

• D04H3/013

  Regenerated cellulose series · CPC title

• B29L2031/731

  Filamentary material, i.e. comprised of a single element, e.g. filaments, strands, threads, fibres (cables B29L2031/707) · CPC title

• D01D5/06 Primary

  Wet spinning methods {(D01D5/0046 takes precedence)} · CPC title

• B29C48/147

  after the die nozzle · CPC title

• B29C48/05

  Filamentary, e.g. strands · CPC title