The present disclosure relates to a multilayer film capable of releasing an active ingredient, for example a pesticide. The film has a bottom or internal layer composed in part of a water-soluble polymer fraction containing the active ingredient, and a top or external layer. The bottom or internal layer may have a water-insoluble fraction in addition to the water-soluble polymer fraction. Relative proportions of the water-soluble polymer fraction and of the water-insoluble fraction provide a pre-determined time of release of the active ingredient when the multilayer film is exposed to humidity and/or moist conditions. The present disclosure also relates to methods of making the multilayer film and to uses of the film.本揭示有關一種能夠釋出活性成分(例如殺害蟲劑)之多層薄膜。薄膜具有一個由含有活性成分的水溶性聚合物份(fraction)部分組成之底或內部層,及一個頂或外部層。除了水溶性聚合物份外,底或內部層可具有水不溶份。當多層薄膜暴露於溼度及/或潮濕條件時,水溶性聚合物份與水不溶份之相對比例提供預定時間釋出活性成分。本揭示亦有關一種製作多層薄膜之方法及薄膜用途。10‧‧‧多層薄膜12‧‧‧向大地層14‧‧‧中間層141、142、143、144‧‧‧次層16‧‧‧向天空層20‧‧‧多層薄膜袋22‧‧‧內部層24‧‧‧中間層25‧‧‧接縫26‧‧‧外部層28‧‧‧內側
