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    Microcapsules and microencapsulation process
    3.
    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。

    Process for producing multiple types of microcapsules
    4.
    发明公开
    Process for producing multiple types of microcapsules 失效
    Verfahren zum Herstellen von unterschiedlichen Typen von Mikrokapseln。

    公开(公告)号：EP0148769A1

    公开(公告)日：1985-07-17

    申请号：EP85300096.6

    申请日：1985-01-07

    Applicant: STAUFFER CHEMICAL COMPANY

    Inventor： Scher, Herbert Benson

    IPC: B01J13/02 ,  A01N25/28

    CPC classification number: B01J13/16 ,  A01N25/28

    Abstract: A process of encapsulating water-immiscible material within discrete capsules of polyurea without addition of a second reactant, whereby hydrolysis of an isocyanate mo- nomertoform an amine takes place, which in turn reacts with another isocyanate monomer to form polyurea, which comprises the steps of

    (a) providing at room temperature, a dispersion of

    (i) a plurality of water-immiscible phases, each phase comprising the water-immiscible material to be encapsulated and at least one organic polyisocyanate in
    (ii) an aqueous phase comprising a solution of water, a surfactant and a protective colloid; and

    (b) heating and maintaining said dispersion in a temperature range of about 40° C to about 90° C, whereupon said water-immisicible material is encapsulated within discrete polyurea capsuler enclosures directly usable without further separation or purification.

    Abstract translation: 将不溶于水的材料包封在聚脲的离散胶囊内而不加入第二反应物的方法，由此发生异氰酸酯单体水解以形成胺，该反应又与另一种异氰酸酯单体反应形成聚脲，其包括以下步骤： （a）在室温下提供（i）多个水不混溶相的分散体，每个相包含待包封的与水不混溶的材料和至少一种有机多异氰酸酯，所述水性相包含： 水，表面活性剂和保护胶体; 和（b）在约40℃至约90℃的温度范围内加热和保持所述分散体，于是所述水不渗透材料被包封在不经进一步分离或纯化的直接可用的离散聚脲包囊内。

    Impregnated porous granules with slow-release pore membranes, and process for the manufacture thereof
    5.
    发明公开
    Impregnated porous granules with slow-release pore membranes, and process for the manufacture thereof 失效
    具有缓释Porienmembranen和它们的制备方法浸渍的多孔颗粒。

    公开(公告)号：EP0005302A2

    公开(公告)日：1979-11-14

    申请号：EP79200211.5

    申请日：1979-05-02

    Applicant: STAUFFER CHEMICAL COMPANY

    Inventor： Hahn, Alice Ulhee ,  Rider, Richard Harold ,  Scher, Herbert Benson ,  Hargrove, Garrard Lee

    IPC: A01N25/12 ,  C05G1/00 ,  C08J5/00

    CPC classification number: B01J2/006 ,  A01N25/26 ,  C05G3/0082 ,  Y10S428/905 ,  Y10S428/907 ,  Y10T428/2998

    Abstract: Open-ended pores of a porous granule are filled with a liquid material which is at least partially immiscible with water, and sealed with a porous polyurea membrane which limits the release rate of the material into the surrounding medium. The membrane is formed by

    (a) applying to the bare granule an organic solution comprising the liquid material and an organic polyisocyanate, followed by
    (b) applying to the granule an aqueous solution comprising water and a catalytic amount of a catalyst selected from the group consisting of a basic organic tertiary amine and an alkyl tin carboxylate.

    Abstract translation: 多孔颗粒的开放式孔填充有液体材料的所有可与水至少部分不混溶，并具有多孔聚脲膜，其限制了材料的释放速率到周围介质中密封。 该膜通过（a）施加到有机溶液的裸颗粒包括液体材料和多异氰酸酯在有机，其次是（b）将所述颗粒到wässrige溶液包含水和从所述组中选择的催化剂的催化量FORMED 由碱性有机叔胺和烷基羧酸锡的。

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