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    Microcapsules and microencapsulation process
    2.
    发明公开
    Microcapsules and microencapsulation process 失效
    Mikrokapseln und Verfahren zur Mikroeinkapselung。

    公开(公告)号：EP0158449A1

    公开(公告)日：1985-10-16

    申请号：EP85301744.0

    申请日：1985-03-13

    Applicant: STAUFFER CHEMICAL COMPANY

    Inventor： Scher, Herbert Benson ,  Rodson, Marius

    IPC: B01J13/02 ,  A01N25/28

    CPC classification number: A01N25/28 ,  B01J13/18

    Abstract: Novel microcapsules are disclosed in which a liquid material which is substantially insoluble in water is enclosed within a solid permeable shell of etherified urea-formaldehyde polymer, prepared by a process which comprises: (a) providing an organic solution comprising said material and a urea-formaldehyde prepolymer in which from about 50% to about 98% of the methylol groups of said prepolymer have been etherified with a C 4 -C 10 alcohol; (b) creating an emulsion of said organic solution in an aqueous solution comprising water and a surface-active agent, wherein said emulsion comprises discrete droplets of said organic solution dispersed in said aqueous solution; (c) causing in situ self-condensation of said urea-formaldehyde prepolymers by adding to said emulsion an acidifying agent and maintaining said emulsion at a pH of between about 0 and about 4 for a sufficient period of time to allow substantial completion of in situ condensation of said resin prepolymers to convert the liquid droplets of said organic solution to capsules consisting of solid permeable polymer shells enclosing said liquid material; and (d) heating said emulsion to a temperature between about 20°C and about 100°C to cause curing of said in situ formed polymers.

    Abstract translation: 公开了一种新颖的微胶囊，其中基本上不溶于水的液体材料被封闭在醚化的脲 - 甲醛聚合物的固体可渗透的外壳内，该壳体通过包括以下步骤的方法制备：（a）提供包含所述材料的有机溶液和脲 - 甲醛预聚物，其中约50％至约98％的所述预聚物的羟甲基已用C4-C10醇醚化; （b）在包含水和表面活性剂的水溶液中产生所述有机溶液的乳液，其中所述乳液包含分散在所述水溶液中的所述有机溶液的离散液滴; （c）通过向所述乳液中加入酸化剂并将所述乳液保持在约0至约4之间的pH约足够的时间以使所述脲 - 甲醛预聚物的原位自缩合，使得基本上完成 所述树脂预聚物的缩合将所述有机溶液的液滴转化为由包封所述液体材料的固体可渗透聚合物壳组成的胶囊; 和（d）将所述乳液加热至约20℃至约100℃的温度以引起所述原位形成的聚合物的固化。

    Pesticide compositions
    7.
    发明公开
    Pesticide compositions 失效
    Pestizide Zusammensetzungen。

    公开(公告)号：EP0134674A1

    公开(公告)日：1985-03-20

    申请号：EP84304908.1

    申请日：1984-07-18

    Applicant: STAUFFER CHEMICAL COMPANY

    Inventor： Scher, Herbert Benson ,  Rodson, Marius ,  Morgan, Ronald Lee

    IPC: A01N25/28 ,  A01N25/32 ,  A01N57/22

    CPC classification number: A01N25/32 ,  A01N25/28 ,  A01N57/22 ,  A01N2300/00

    Abstract: Pesticide compositions comprising a microencapsulated lipophilic pesticide, a hydrophilic surfactant and water show reduced dermal toxicity. The hydrophilic surfactant has an HLB of from 17 to 20. Methods for making such compositions and their use in controlling insects are described.

    Abstract translation: 包含微胶囊化的亲脂性农药，亲水性表面活性剂和水的农药组合物显示降低的皮肤毒性。 亲水性表面活性剂的HLB为17〜20。描述了制备这些组合物及其在控制昆虫中的用途的方法。

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