a biocidal phosphate ester in combination with an inert inorganic or organic particulate or polymeric carrier . the biocidal - carrier composition is useful in extending the effective lifetime of the biocidal phosphate ester when incorporated into a variety of materials including plastics , fibrous materials , and solutions . applications of the disclosed carrier compounds include preparation of mildew resistant paints and plastics having extended antimicrobial properties despite extensive washing and wear of the surface .