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    • 87. 发明公开
    • Controlled release delivery coating formulation for bioactive substances
    • Die zur Freisetzung bioaktiver Substanzen kontrollierendeUmhüllungszubereitung。
    • EP0305918A1
    • 1989-03-08
    • EP88113933.1
    • 1988-08-26
    • AIR PRODUCTS AND CHEMICALS, INC.
    • Ambegoankar, Anil S.Howells, Roger Alan
    • A61K9/54
    • A01N25/26A61K9/2886A61K9/5073
    • The present invention relates to a bioactive composition having a controlled, sustained release delivery pattern when contacted with a suitable surrounding media. The composition comprises a pharmaceutically, insecticidally, herbicidally or fertilizing bioactive material core, soluble in a given surrounding media, the core present in an amount at least sufficient for a total dosage during a specified treatment period; a first coating enveloping the bioactive material core comprising a polymer or a blend of polymers, said polymer or blend of polymers being swellable upon penetration by the surrounding media; and a second coating enveloping the first coating, the second coating comprising a polymer or a blend of polymers being water-insoluble and forming a semi-permeable barrier to the inward diffusion of the surrounding media and the outward diffusion of the bioactive material dissolved in the surrounding media.
    • 本发明涉及当与合适的周围介质接触时具有受控的持续释放递送模式的生物活性组合物。 组合物包含可溶于给定周围培养基的药学,杀虫,除草或施肥的生物活性物质核心,核心以至少足以在指定治疗期间的总剂量存在的量存在; 包围生物活性材料芯的第一涂层包括聚合物或聚合物的共混物,所述聚合物或聚合物的共混物在被周围介质穿透时可溶胀; 以及包封第一涂层的第二涂层,所述第二涂层包含聚合物或聚合物的共混物,其是不溶于水的并且形成对周围介质的向内扩散的半透性屏障和溶解在所述第二涂层中的生物活性材料的向外扩散 周边媒体。