Antimicrobial nonwoven polyamides with zinc content
AssigneeAscend Performance Materials Operations LLC
InventorsScott E. Osborn, Wai-shing Yung, Albert Ortega
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Abstract
The present disclosure relates to a nonwoven polyamide structure having antimicrobial properties comprising: nonwoven polyamide fibers comprising less than 4000 ppm zinc dispersed within the nonwoven polyamide fibers; and less than 2000 ppm phosphorus. The fibers have an average fiber diameter of less than 25 microns; and the polyamide structure demonstrates a Staphylococcus Aureus reduction of at least 90%, as measured by ISO 20743-13.
Claims17
A nonwoven polyamide structure having antimicrobial properties comprising:
- nonwoven polyamide fibers comprising a polyamide composition comprising:
- less than 4000 ppm zinc dispersed within the nonwoven polyamide fibers;
- and
- less than 2000 ppm phosphorus,
- wherein the fibers have an average fiber diameter of less than 20 microns;
- wherein the zinc is provided via a zinc compound and the phosphorus is provided via a phosphorus compound different from the zinc compound;
- and
- wherein the polyamide structure demonstrates a Staphylococcus Aureus reduction of at least 90%, as measured by ISO 20743-13.
Antimicrobial fibers having antimicrobial properties comprising:
- a polymer;
- less than 4000 ppm zinc dispersed within the polymer;
- and
- less than 2000 ppm phosphorus,
- wherein the fibers have an average fiber diameter of less than 20 microns;
- wherein the zinc is provided via a zinc compound and the phosphorus is provided via a phosphorus compound different from the zinc compound;
- and
- wherein the antimicrobial fibers demonstrate a Staphylococcus Aureus reduction of at least 90%, as measured by ISO 20743-13.
A process for preparing an antimicrobial nonwoven polyamide structure having permanent antimicrobial properties, the process comprising:
- preparing precursor polyamide comprising an aqueous monomer solution;
- dispersing less than 4000 ppm zinc within the precursor polyamide;
- dispersing less than 2000 ppm phosphorus within the precursor polyamide;
- wherein the zinc is provided via a zinc compound and the phosphorus is provided via a phosphorus compound different from the zinc compound;
- polymerizing the precursor polyamide to form a polyamide composition;
- spinning the polyamide composition to form antimicrobial polyamide fibers;
- and
- forming the antimicrobial polyamide fibers into the antimicrobial nonwoven structure having a fiber diameter of less than 20 microns;
- and
- wherein the polyamide structure demonstrates a Staphylococcus Aureus reduction of at least 90%, as measured by ISO 20743-13.
A process for preparing an antimicrobial nonwoven polyamide structure having antimicrobial properties, the process comprising:
- preparing a formulation comprising a polyamide, less than 4000 ppm zinc dispersed within the polyamide;
- and less than 2000 ppm phosphorus dispersed within the polyamide, wherein the zinc is provided via a zinc compound and the phosphorus is provided via a phosphorus compound different from the zinc compound;
- spinning the formulation to form antimicrobial polyamide fibers having a fiber diameter c less than 20 microns;
- and
- forming the antimicrobial polyamide fibers into antimicrobial nonwoven polyamide structure;
- wherein the fibers were spun using a die pressure less than 275 psig;
- and
- wherein the polyamide structure demonstrates a Staphylococcus Aureus reduction of at least 90%, as measured by ISO 20743-13.
Dependencies are inferred from the claim text.