Protracted-release microbiocidal articles containing microbiocides of relatively low water solubility.

摘要

A membrane contains, sealed therein, a solid particulate microbiocidal composition which is useful in aqueous systems, comprising microbiocide of relatively low water solubility (less than 1000 ppm at room temperature i.e. 25 DEG C) and inert, finely-divided water-insoluble solid carrier material, therefore, the membrane having a film thickness sufficient to maintain its integrity and water permeability sufficient to permit diffusion of water therethrough. Especially useful microbiocides are 3-isothiazolones and 2-substituted-1,2-benzisothiazolones having relatively low water solubility, and metal salt stabilized derivatives thereof, admixed with silicaceous diatomaceous earth. Microbiocides of higher solubility can be included in the microbiocidal composition provided that the total microbiocide has a water solubility less than 1000 ppm at room temperature. Release of active ingredient from the sealed membrane is protracted and can be controlled. A safer form of active ingredients known to be relatively irritating to human skin when at high concentration in aqueous solution is also provided.