知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

23 条记录 (耗时 0.019 秒)

    Foamed polymer blends
    10.
    发明授权
    Foamed polymer blends 失效
    发泡聚合物共混物

    公开(公告)号：US5114987A

    公开(公告)日：1992-05-19

    申请号：US597431

    申请日：1990-10-15

    申请人： Mukerrem Cakmak ,  Anit Dutta

    发明人： Mukerrem Cakmak ,  Anit Dutta

    IPC分类号： C08J9/00

    CPC分类号： C08J9/0061 ,  C08J2321/00 ,  C08J2421/00

    摘要： A process for preparing foamed polymer blends of thermoplastic polymers with elastomeric polymers comprises mixing the elastomeric polymers with a chemical blowing agent and compounding additives. The mixture is then combined with a thermoplastic polymer to form a blend, and thereafter mixed with a curing system and a blowing agent activator. The curable composition thus prepared can subsequently be blown in either a one or two-step process. The two-step process entails partially curing the elastomer in the composition at a lower temperature, and then blowing the composition at a higher temperature. The one-step process involves (a) heating the composition to the higher temperature initially, thereby initiating curing, and after an activating induction period of the blowing agent, producing blowing; or (b) curing and blowing the composition by extruding it through an extruder. In both processes, the elastomer present in the blend is sufficiently cured prior to blowing to prevent the escape of the blowing bubbles, but not to the extent that bubble formation is prevented.

    摘要翻译： 制备热塑性聚合物与弹性体聚合物的发泡聚合物共混物的方法包括将弹性体聚合物与化学发泡剂和复合添加剂混合。 然后将混合物与热塑性聚合物混合以形成共混物，然后与固化体系和发泡剂活化剂混合。 随后可以以一步或两步法吹制如此制备的可固化组合物。 两步法在较低温度下使组合物中的弹性体部分固化，然后在较高温度下吹制组合物。 一步法包括（a）将组合物最初加热到更高的温度，从而引发固化，并且在发泡剂的活化诱导期后，产生吹塑; 或（b）通过将组合物挤出通过挤出机固化和吹塑组合物。 在两种方法中，共混物中存在的弹性体在吹塑之前充分固化，以防止吹泡泡逸出，但不能防止气泡形成。