Regenerated cellulose fiber

Abstract

The present invention relates to a regenerated cellulose fiber which contains a hydrophobic substance selected from the group consisting of alkyl ketene dimers, alkenyl ketene dimers, alkyl succinic anhydrides, alkenyl succinic anhydrides, alkyl glutaric acid anhydrides, alkenyl glutaric acid anhydrides, alkyl isocyanates, alkenyl isocyanates, fatty acid anhydrides as well as mixtures thereof incorporated in the cellulose matrix.

Claims

1. A regenerated viscose fiber having a cellulose matrix, wherein said fiber is produced according to a viscose process, wherein said fiber is water-repellant and comprises a hydrophobic substance incorporated into the cellulose matrix by adding the hydrophobic substance into a spinning solution or a precursor thereof during the viscose process, wherein the hydrophobic substance is an alkyl ketene dimer wherein the content of the hydrophobic substance in the regenerated viscose fiber is 0.1% by weight to 1% by weight based on cellulose in the regenerated viscose fiber, and wherein the regenerated viscose fiber has a titer ranging from 0.5 to 28 dtex.

2. A process for the production of a regenerated viscose fiber according to claim 1, comprising the step of adding the hydrophobic substance to a spinning viscose or a precursor thereof.

3. A product comprising the regenerated viscose fiber according to claim 1.

4. The product according to claim 3, wherein the product is selected from the group consisting of sanitary products, medical products, papers, wet-laid nonwovens, textile products, nonwoven fabrics, and filter media.

5. The product according to claim 4, wherein the sanitary products are selected from the group consisting of cover sheets and back sheets.

6. The product according to claim 4, wherein the medical products are wound dressings.

7. The product according to claim 4, wherein the textile products are selected from the group consisting of sportswear and protective clothing.

8. The product according to claim 4, wherein the filter media are cigarette filters.

Description

EXAMPLES

(1) Hydrophobic substances of the following substance classes were added to a spinning viscose:

(2) a) a vinyl acetate copolymer (Vinnapas EN 1028, manufacturer: company Wacker)

(3) b) a quaternary fatty acid derivative (Adulcinol BUN, manufacturer: company Zschimmer & Schwarz)

(4) c) an alkyl ketene dimer (AKD) (Ukasol NL-201, manufacturer: company Schill & Seilacher)

(5) d) a further quaternary fatty acid derivative (Stantex s6557, manufacturer: company Pulcra Chemicals)

(6) e) a fatty alcohol combination (Setilon KN, manufacturer: company Pulcra Chemicals)

(7) f) a fatty acid condensation product (Duron OS 2160, manufacturer: company CHT) and

(8) g) ester oils (Duron OS 3136, manufacturer: company CHT)

(9) It has been attempted to spin viscose fibers from the thus modified spinning viscoses in the usual manner. Only in cases c) and g) it has been possible to successfully spin out fibers.

(10) An increase in the hydrophobicity of the produced fibers (examined on the basis of the sinking of the fibers into water) could be observed only in case c) (water repellent finishing with AKD).