Antimicrobial coating material for surface coating

A method of producing an antimicrobial coated material for application to porous materials or porous media, comprising the steps of:

• (a) preparing a biocide mixture comprising at least one antimicrobial component selected from the group consisting of chlorine dioxide, hydrogen peroxide, peroxy acids, alcoholic compounds, phenolic compounds, essential oils, antimicrobial components of essential oils, bleach, antimicrobial phytochemicals, and combinations thereof;
• (b) preparing a suspension or a solution of nonionic polymers and inorganic materials, wherein the inorganic materials are selected from the group consisting of metal oxides, metal complexes, metal salts, metal particles and combinations thereof;
• (c) preparing a stable sol suspension comprising the biocide mixture encapsulated within inorganic-organic shells, wherein the inorganic-organic shells comprise the suspension or the solution of the nonionic polymer and the inorganic material, wherein the stable sol suspension forms an antimicrobial coating material,
• wherein the inorganic-organic shells are permeable to the biocide mixture, the inorganic material being selected from the group consisting of titania sol, titanium peroxo complex sol, silica sol, alumina sol and combinations thereof, organic materials of the inorganic-organic shells comprising the nonionic polymers,
• wherein the inorganic-organic shells encapsulate and contain the biocide mixture to form capsule structures for storage and release of the biocide mixture, wherein the inorganic material is present in a concentration of 0.5-95 wt % of the inorganic-organic shells,
• wherein structures of the inorganic-organic shells comprise a multi-layered structure, and
• wherein the multi-layered structure comprises more than one layer of the organic materials sandwiched between adjacent layers of the inorganic materials;
• and
• (d) applying the antimicrobial coating material on a porous material or in a porous medium to form an antimicrobial coated material.