| 摘要 |
A membrane, permeable to water, and impermeable to microbiocidal compounds contains therein a solid particulate microbiocidal composition which is useful in aqueous systems, comprising a relatively highly water-soluble (more than 1000 ppm at room temperature i.e. 25 DEG C) a microbiocidal compound and inert, finely-divided water-insoluble solid carrier therefor, the membrane being made from a film-forming material having a solubility parameter less than 12.5. Especially useful microbiocides are 3-isothiazolones and 2-substituted-1,2-benzisothiazolones, and metal salt stabilized derivatives thereof preferably absorbed into silicaceous diatomaceous earth in a sealed, perforated membrane, for example, a perforated bag, produced from polyethylene. Microbiocides of lower solubility can be included in the microbiocidal composition provided that the total microbiocide has a water solubility more than 1000 ppm at room temperature. A safer form of active ingredient known to be relatively irritating to human skin when in high concentration in aqueous solution is provided as are method for controlling microorganisms and for effecting protracted release of the microbiocide in aqueous media, using the articles. |
