Extruder polymerization of polyurethanes
    8.
    发明授权
    Extruder polymerization of polyurethanes 失效
    聚氨酯的挤出机聚合

    公开(公告)号:US4948859A

    公开(公告)日:1990-08-14

    申请号:US263713

    申请日:1988-10-28

    IPC分类号: C08G18/08 C08G18/67

    摘要: Bulk polymerization process for making radiation curable polyurethanes which comprises:(A) providing the following raw materials:(1) diisocyanate;(2) oligomeric diol>400 molecular weight; and(3) >1 chain extending monomer;(B) reacting the raw materials in a twin screw extruder under the following conditions:(1) molar ratio of isocyanate to hydroxy moieties of about 1;(2) ratio of chain extending monomer to other monomers sufficient to yield a polymer having chain extender incorporated at 0.1 to 10 weight percent;(3) extruder temperature sufficient to initiate and maintain reaction; and(4) residence time sufficient to obtain substantially complete reaction of diisocyanate;(C) cooling product polymer. Polyurethane product has weight average molecular weight greater than 80,000 and acrylate or methacrylate functionality. Process permits continuous production of radiation curable polyurethanes having narrow molecular weight distribution and high tensile strength.

    Certain mono-bromo bis-phenyl benzofurans
    10.
    发明授权
    Certain mono-bromo bis-phenyl benzofurans 失效
    某些单溴双苯基苯并呋喃

    公开(公告)号:US4247469A

    公开(公告)日:1981-01-27

    申请号:US113541

    申请日:1980-01-21

    IPC分类号: C07D307/82 C07D307/79

    CPC分类号: C07D307/82

    摘要: Compounds wherein 2-nitrobenzofuran is substituted by one or two phenyl groups and certain other substituents which are active as antimicrobial agents, a processes for their use and intermediates therefor.

    摘要翻译: 其中2-硝基苯并呋喃被一个或两个苯基取代的化合物和某些其它作为抗微生物剂活性的其它取代基,它们的用途及其中间体。