Antimicrobial, antifungal and antiviral rayon fibers
The invention provides an antimicrobial, antifungal and antiviral polymeric material, comprising rayon fibers and a single antimicrobial, antifungal and antiviral component consisting essentially of microscopic water insoluble particles of copper oxide incorporated in said fibers wherein a portion of said particles in said fibers are exposed and protruding from the surface of the fibers and wherein said particles release Cu ++ when exposed to water or water vapor.
1. A method of making a rayon fiber with antibacterial, antifungal and/or antiviral properties comprising (i) adding microscopic, water insoluble, copper oxide particles to a rayon viscose and (ii) extruding the viscose through a spinnerette into an acid bath comprising sulfuric acid, thereby producing a rayon fiber comprising particles of copper oxide wherein a portion of said particles are exposed andprotruding from the surface of the fiber, wherein the copper oxide particles are added in an amount of between 0.25 and 10% of the initial cellulose dry weight, wherein the rayon fiber exhibits antibacterial, antifungal and/or antiviral properties.
2. The method of claim 1 , wherein, on average, the dimensions of the copper oxide particles fall in the range between 0.5 and 4 microns.
3. The method of claim 2 , wherein the dimensions are in the range of 1 to 2 microns.
4. The method of claim 1 wherein the rayon viscose is made using cellulose from wood pulp.
5. The method of claim 1 wherein the rayon viscose comprises a plasticizer.