| abstract |
Disclosed is a process for the preparation of cellulose moldings which release an active ingredient controlled. For this pulp is dispersed in a direct aqueous solvent for cellulose to a mash. In parallel, an organically modified or ion-exchange activated sheet silicate is homogenized in a direct solvent for cellulose and thereby exfoliated by shear and then mixed with the pulp mash. Separately, a mixture of active ingredient and a lipophilic matrix material or an active ingredient-containing water-in-oil emulsion is stabilized by inorganic or organic thickener and converted into a gel-like paste, which is then also mixed with the pulp mash. From the mixture, water is removed until the cellulose is completely dissolved. The mixture is then molded into shaped articles in a solution spinning process and dried. The active ingredient is, for example, a cosmetic active ingredient, a fat-soluble vitamin or a nonpolar plant extract. The molded articles produced by the process contain finely divided domains of active ingredient and matrix material or active ingredient-containing emulsion. The moldings can be used in particular as functional fibers in knitted fabrics, woven fabrics, nonwovens, paper as well as in films and membranes. |