Antimicrobial particles of silver and barium sulfate or zinc oxide
AssigneeE. I. Du Pont de Nemours and Company
InventorsHoward W. Jacobson, Michael H. Scholla, Annie W. Wigfall
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Abstract
An antimicrobial composition comprising an inorganic particle with a first coating providing antimicrobial properties and a second coating providing a protective function is disclosed with a method for preparing the same and uses; further processes for producing polymeric articles and a method for controlling microorganisms are also disclosed.
Claims12
An antimicrobial composition consisting essentially of barium sulfate particles having successive coatings of
- 1) about 0.05 to 3 weight percent, based upon said particles, silver with about 0.05 to 3 weight percent optional copper (II) oxide,
- 2) about 0.10 to 6 weight percent silica, and
- 3) an amount of hydrous alumina sufficient to provide an isoelectric point for the particle with its coatings of about 5.5 to 9.5;
- wherein the average diameter of said particles is about 0.01 to 100 microns.
An antimicrobial composition consisting essentially of zinc oxide particles having successive coatings of about 0.05 to 3 weight percent silver, based upon said particles, about 0.10 to 6 weight percent silica, an amount of hydrous alumina sufficient to provide an isoelectric point of about 5.5 to 9.5, wherein the average diameter of said particles is about 0.01 to 100 microns.
Dependencies are inferred from the claim text.