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Polysaccharide fibers and method for producing same

Inactive Publication Date: 2016-05-19
DUPONT IND BIOSCIENCES USA LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This invention provides a way to make a type of fiber made from polysaccharides. The method is cost-effective and can be done using existing facilities. The fiber is also soluble in water, which makes it easier to work with. The main benefit of this invention is that it solves problems with previous methods of making polysaccharide fibers.

Problems solved by technology

In addition to the shorter chains having the desired degree of polymerization, this also creates significantly shorter fragments such as oligomers or even monomers which remain in solution after the precipitation of the spinning solution in the precipitation bath, do not contribute to the formation of the fibers, and thus are lost.
The quantities of raw material lost in this process can be substantial and can affect the cost-effectiveness of the entire process.
As used in this context, “substantially” means that within the polysaccharide chains there may exist occasional defective locations where other bond configurations may occur.
These solvents are costly and complex to regenerate.
Unfortunately, it was found that in these conditions α(1→3)-glucans could not be processed satisfactorily into fibers, as glucans dissolve in a diluted aqueous sodium hydroxide solution.
In view of this fact, it is not possible to simply use α(1→3)-glucans instead of cellulose in the existing methods.

Method used

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  • Polysaccharide fibers and method for producing same

Examples

Experimental program
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Effect test

example 1

[0033]A viscose xanthogenate containing 29.8% by weight of cellulose, 14.9% by weight of alkali, and 8% by weight of sulfur was reacted in a dissolving unit with a first dissolving liquor containing 4.5% by weight of NaOH and then with a second dissolving liquor containing 9% by weight of α(1→3)-glucan and 4.5% by weight of NaOH and finally with water. The viscose obtained in this way contains 9% by weight of fiber-forming material, 5.20% by weight of alkali, and 2.4% by weight of sulfur (calculated under the assumption that there are 100% by weight of cellulose as a fiber-forming material), with a ripeness index of 14 Hottenroth and a falling ball viscosity of 80 seconds (determined according to the Zellcheming Leaflet III / 5 / E). Viscose solutions with 10 and 25% of α(1→3)-glucan were prepared. These glucan quantities were related to the proportion of the α(1→3)-glucan in the fiber-forming substance. These viscose types contain 2.2% by weight of sulfur (10% by weight of glucan and 9...

example 2

[0036]A viscose containing 8.70% by weight of cellulose, 5.20% by weight of alkali, and 2.3% by weight of sulfur, with a ripeness index of 15 Hottenroth and a falling ball viscosity of 75 seconds (determined according to the Zellcheming Leaflet III / 5 / E), was, by means of a spinneret, extruded into a regeneration bath containing 100 g / l of sulfuric acid, 310 g / l of sodium sulfate, and 15 g / l of zinc sulfate. The spinneret had 1053 perforations with a diameter of 50 μm. 0.5% by weight of a nitrogen-containing auxiliary agent were added to the viscose spinning solution. In order to achieve adequate fiber strength, stretching by approx. 75% was carried out in the second bath (92° C., 15 g / l of H2SO4). The draw-off velocity was 50 m / min.

[0037]By using a positive displacement pump, various weight / weight percentages of a α(1→3)-glucan solution (prepared with 5% by weight of NaOH, 8% by weight of α(1→3)-glucan) were added to the viscose solution upstream from the spinneret, and fibers havin...

example 3

[0040]A modal viscose containing 6.0% by weight of cellulose, 6.20% by weight of alkali, and 1.8% by weight of sulfur, with a gamma value of 65 and a falling ball viscosity of 130 seconds (determined according to the Zellcheming Leaflet III / 5 / E) was, by means of a spinneret, extruded into a regeneration bath containing 72 g / l of sulfuric acid, 115 g / l of sodium sulfate, and 55 g / l of zinc sulfate. The spinneret had 1053 perforations with a diameter of 45 μm. 2.5% by weight of a nitrogen-containing auxiliary agent were added to the viscose spinning solution. In order to achieve adequate fiber strength, stretching by approx. 115% was carried out in the second bath (92° C., 15 g / l of H2SO4). The draw-off velocity was 50 m / min.

[0041]By using a positive displacement pump, various weight / weight percentages of a α(1→3)-glucan solution (prepared with 5% by weight of NaOH, 4.5% by weight of α(1→3)-glucan) were added to the viscose solution upstream from the spinneret, and fibers having 5 and...

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Abstract

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

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method for the production of polysaccharide fibers which contain a mixture of cellulose and α(1→3)-glucan as a fiber-forming substance, as well as to the fibers made thereby, and to their use.BACKGROUND OF THE INVENTION[0002]Polysaccharides are becoming increasingly important, as they are materials that can be obtained from renewable raw materials. One of the most frequently occurring polysaccharides is cellulose. Cotton fibers, which consist almost exclusively of cellulose, are an example of the significance of polysaccharides. However, also materials obtained from other cellulosic raw materials, e.g., cellulosic synthetic fibers, are continuing to gain in importance.[0003]The generic names “viscose fibers” and “modal fibers” were assigned by BISFA (the International Bureau for the Standardization of Man-made Fibers) to cellulose fibers produced through chemical derivatization of cellulose with the help of aqueous sodiu...

Claims

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Application Information

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IPC IPC(8): D01F2/06A61L15/28
CPCA61L15/28D01F2/06D01F9/00C08B37/0009C08L5/00C08L1/02D04H1/4258D04H3/013D01D5/06D21H13/08
Inventor RODER, THOMASKAINDL, GERNOTREDLINGER, SIGRIDFIRGO, HEINRICHKRONER, GERT
Owner DUPONT IND BIOSCIENCES USA LLC
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