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    Extruded foam product with reduced surface defects
    1.
    发明授权
    Extruded foam product with reduced surface defects 有权
    具有减少表面缺陷的挤出泡沫产品

    公开(公告)号：US06632382B1

    公开(公告)日：2003-10-14

    申请号：US09511863

    申请日：2000-02-29

    申请人： Larry Michael Miller ,  Raymond Marshall Breindel ,  Mitchell Zane Weekley ,  Thomas Earl Cisar

    发明人： Larry Michael Miller ,  Raymond Marshall Breindel ,  Mitchell Zane Weekley ,  Thomas Earl Cisar

    IPC分类号： B29D700

    CPC分类号： C08J9/0061 ,  C08J2201/03 ,  C08J2205/052 ,  C08J2491/00

    摘要： The present invention generally relates to processes for preparing extruded foam products and more particularly to a process for producing such products wherein surface defects are minimized. There has been a movement to replace conventional halo-carbon blowing agents in favor of purportedly more environmentally safe halo-carbon free blowing agents such as carbon dioxide, nitrogen, argon, water, air, nitrogen, and helium. However, these halo-carbon free blowing agents, in particular carbon dioxide, have higher foaming rates and higher volatility leading to greater surface defects in the extruded foam. The present invention employs polyethylene wax to reduce or eliminate the occurrence of surface defects where halo-carbon free blowing agents are employed in an extruded foam manufacture process. The polyethylene wax containing extruded foam products of this invention are characterized by a generally smooth substantially defect free surface and contain a majority of closed cells which are free of any trapped halo-carbon blowing agents.

    摘要翻译： 本发明一般涉及制备挤出泡沫产品的方法，更具体地说涉及一种生产这种产品的方法，其中表面缺陷最小化。 已经有一种运动来取代常规的卤代碳发泡剂，有利于据称是更环境安全的无卤碳发泡剂，例如二氧化碳，氮气，氩气，水，空气，氮气和氦气。 然而，这些无碳无碳的发泡剂，特别是二氧化碳具有较高的起泡速率和较高的挥发度，导致挤出的泡沫体中较大的表面缺陷。 本发明采用聚乙烯蜡来减少或消除在挤出泡沫制造方法中使用无卤素发泡剂的表面缺陷的发生。 本发明的含聚乙烯蜡的挤出泡沫产品的特征在于基本上无光滑的表面基本上光滑，并且含有大部分没有任何捕获的卤代碳发泡剂的闭孔。