Patent ID: 7238654

Claim:
A stable aqueous biocidal slurry comprising: (a) a plurality of particles comprising a particle selected from the group consisting of a slightly soluble copper salt, a slightly soluble zinc salt, zinc oxide, or mixtures or combinations thereof, wherein the weight mean diameter of the particles is between about 0.05 micron and about 5 microns; (b) a biocidally effective amount of a biocidally active quaternary ammonium salt; and (c) an effective amount of at least one dispersant comprising a hydrophilic polyalkylene oxide portion having between 2 and 50 alkylene oxide units therein and a hydrophobic portion comprising eight or more carbon atoms , wherein the slurry when tested at its intended use concentration is stable if it exhibits suspensibility greater than 80% after thirty minutes when tested according to the Collaborative International Pesticide Analytical Committee Method MT 161.