Abstract: Modified viscose fibres comprise regenerated cellulose and contain in their structure microcrystalline chitosan bound mainly by hydrogen bonds with the regenerated cellulose of viscose fibres. To improve the properties of the fibres the modified fibres contain as a third component a water-soluble and/or alkali-soluble natural polymer or a derivative thereof of polysaccharide origin containing groups bound by hydrogen and/or ionic bonds with the microcrystalline chitosan. Examples of such polymers are alginic acid, sodium and potassium alginate and sodium carboxymethycellulose.

Abstract: Microcrystalline chitosan is used in seed encrusting in the form of liquid dispersion containing 0.0001-10 wt. % of polymer characterized by average molecular weight not lower than 1000, water retention value ranging from 200 to 5000%, deacetylation degree not lower than 35%, particle size in the range of 0.1-100 .mu.m and energy of hydrogen bonds in a form of film of 10-25 kJ/mol. The liquid dispersion is introduced by spraying or mixing with a content of polymer not lower than 0.01 wt. %, whereafter the excess of solvent is removed and polymer film covering the seed is formed.