Hollow anti-microbial fibers and fibrous products
Anti-microbial and/or anti-fungal synthetic hollow fiber ( 2 ) and various products made partially or wholly therefrom are formed in pure hollow or mock-hollow shapes and composed of various thermoplastic polymers having dispersed therein organic or inorganic, antimicrobial additives. The thickness of the fiber walls are optimally equal to or slightly less than the average maximum dimensions of the anti-microbial additive particles. Thus, a portion of the additive particles will be present at outer and/or inner surfaces of the fiber walls, effectively imparting antimicrobial characteristics to the hollow fiber and any fibrous products made therefrom. The additives can be selectively dispersed in certain regions of the fibers in order to reduce the amount of the additives required, and are resistant to separation from the fiber wall, prolonging the fiber's antimicrobial effectiveness. Additional additives can be dispersed in the fiber wall with the antimicrobial agents in order to enhance or provide different fiber properties.
1 . An antimicrobial fiber, comprising:
a fiber having a thermoplastic, polymeric wall defining one or more axially extending voids within the fiber; and
antimicrobial particles interspersed within the wall.
2 . The fiber of claim 1 , wherein the antimicrobial particles comprise organic or inorganic particles.
3 . The fiber of claim 1 , wherein the wall has a thickness in the range of about 1.73 to 2.25 times the nominal size of the antimicrobial particles.
4 . The fiber of claim 1 , wherein the antimicrobial particles comprise one or more inorganic additive selected from the group consisting of copper, silver, tin, and zinc.
5 . The fiber of claim 4 , wherein the one or more inorganic additives are incorporated in a carrier selected from the group consisting of zirconium phosphate, zeolites, and dissolvable glass.
6 . The fiber of claim 1 , wherein the antimicrobial particles comprise zeolites of silver particles.
7 . The fiber of claim 1 , wherein the antimicrobial particles comprise triclosan particles.
8 . The fiber of claim 1 , wherein the fiber wall is composed of a polymer selected from the group consisting of polyester, nylon (polyamid), rayon, lyocell, polypropylene, polyethylene, aramid, acrylic, PCT, PETG, Co-PET, PTT, 3GT, and polyamide 6 or 6,6.
9 . The fiber of claim 1 , further comprising an additive interspersed in the wall selected from the group of materials consisting of pigments, anti-odor compounds, fire-retardant materials, hydrophilic materials, hydrophobic materials, UV additives, and/or anti-stain materials.
10 . The fiber of claim 1 , wherein the one or more axially extending voids extend the entire length of the fiber.
11 . The fiber of claim 1 , wherein the fiber is continuous filament.
12 . The fiber of claim 1 , wherein the wall includes an axially extending discontinuity along the length of the fiber.