The Naval Research Laboratory (NRL) has developed a series of biocides that, when formulated with the proper resin systems, produce coatings and polymers that kill a variety of bacteria, molds and viruses on contact. The biocidal component is similar to those found in many products on the market.
The advantage of the NRL biocide stems from the novel design of the molecule, with one end being hydrophobic and the other hydrophilic. This structure causes the biocide to preferentially migrate to the surface, where it is most effective, while the resin or coating is still liquid. The structure also greatly reduces removal by leaching once dried or cured.
The biocides are broadly applicable, and they are effective against both Gram-positive and Gram-negative bacteria and are highly effective against common bacteria (e.g., Log 7 kill in <1 hr for 107 colony-forming units of E. coli and Staphylococus Aureus ("Staph")). Also demonstrated to be effective against viruses, the biocides are stable up to 200°C in air, and are economical as migration to surface prior to hardening allows for use of low loading.
Applications for the broad-spectrum biocide technology include: additives for paints and coatings that kill germs (e.g., in hospitals and medical offices); in fiber sizings for fabrics used in camping and outdoor gear (including tents and clothing); as a polymer additive for molded plastics (food packaging, computer keyboards). It has been shown to reduce mold and mildew on polymers used in humid environments (e.g., kitchens and bathrooms, boats, building exteriors, specifically vinyl siding and windows, paints and coatings).
For further information or for commercial licensing information, contact the NRL Technology Transfer Office, techtran@utopia.nrl.navy.mil.
