Protracted-release microbiocidal articles containing microbiocides of relatively low water solubility
申请人:ROHM AND HAAS COMPANY
公开号:EP0109738A1
公开(公告)日:1984-05-30
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°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.
膜内密封有一种可用于水系统的固体颗粒杀微生物组合物,该组合物包括水溶性相对较低的杀微生物剂(室温即 25°C 时小于 1000 ppm)和惰性的、细小的不溶于水的固体载体材料,因此,膜具有足以保持其完整性的膜厚度和足以允许水通过其扩散的透水性。特别有用的杀微生物剂是水溶性相对较低的 3-异噻唑啉酮和 2-取代的-1,2-苯并异噻唑啉酮及其金属盐稳定衍生物,并与硅藻土混合。只要杀微生物剂在室温下的总水溶性小于 1000 ppm,就可以在杀微生物剂组合物中加入溶解度更高的杀微生物剂。活性成分从密封膜中释放的时间较长,可加以控制。此外,还提供了一种更安全的活性成分形式,已知这种活性成分在高浓度水溶液中对人体皮肤有较强的刺激性。