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    Microcapsules with readily adjustable release rates
    7.
    发明授权
    Microcapsules with readily adjustable release rates 失效
    微胶囊容易调节释放速率

    公开(公告)号：US5925595A

    公开(公告)日：1999-07-20

    申请号：US924671

    申请日：1997-09-05

    申请人： Michael E. Seitz ,  Ronald J. Brinker ,  Jeff N. Travers

    发明人： Michael E. Seitz ,  Ronald J. Brinker ,  Jeff N. Travers

    IPC分类号： A01N25/28 ,  A01N37/26 ,  C08G18/08 ,  C08G18/32 ,  C08G18/76 ,  C08G18/78

    CPC分类号： C08G18/7831 ,  A01N25/28 ,  A01N37/26 ,  C08G18/0866 ,  C08G18/3228 ,  C08G18/765 ,  Y10S514/963

    摘要： A process for the preparation of a microencapsulated composition comprises: (a) combining (i) a triisocyanate that is an adduct of linear aliphatic isocyanates having the formula O.dbd.C.dbd.N--(CH.sub.2).sub.n --N.dbd.C.dbd.O, where n is from about 4-18, (ii) an aliphatic diisocyanate that contains a cycloaliphatic or aromatic ring moiety, the aliphatic diisocyanate having from about 6-32 carbon atoms, most preferably from about 8-18 carbon atoms, and (iii) a water-immiscible composition comprising a core chemical; (b) adding an aqueous liquid and forming an oil-in-water emulsion; (c) adding a polyamine to the emulsion; and (d) reacting the triisocyanate, the diisocyanate, and the polyamine, thereby producing a plurality of microcapsules having a capsule wall, with at least a major portion of the core chemical encapsulated within the capsule wall of the microcapsules. Suitable core chemicals include agricultural chemicals such as herbicides and safeners. By adjusting the composition of the capsule walls and the contents of the capsule core, the rate of release of the core materials from the microcapsules can be adjusted. When the core contains two or more materials to be released, the microcapsules can provide a more rapid rate of release for one core material than for another.

    摘要翻译： 一种制备微囊化组合物的方法包括：（i）将（i）三异氰酸酯与式（O）= C（=（CH 2）n N = C = O）的直链脂族异氰酸酯的加合物组合，其中n为 约4-18，（ii）含有脂环族或芳族环部分的脂族二异氰酸酯，脂族二异氰酸酯具有约6-32个碳原子，最优选约8-18个碳原子，和（iii）与水不混溶 组合物，其包含核心化学品; （b）加入水性液体并形成水包油乳液; （c）向该乳液中加入多胺; 和（d）使三异氰酸酯，二异氰酸酯和多胺反应，从而制备多个具有胶囊壁的微胶囊，其中至少大部分芯化学品包封在微胶囊的胶囊壁内。 合适的核心化学品包括农​​药如除草剂和安全剂。 通过调节胶囊壁的组成和胶囊芯的内容物，可以调节芯材料从微胶囊的释放速度。 当核心包含两种或更多待释放的材料时，微胶囊可以为一种芯材料提供比另一种芯材更快的释放速率。