EXTRUDED FOAM PRODUCT WITH REDUCED SURFACE DEFECTS
    2.
    发明公开
    EXTRUDED FOAM PRODUCT WITH REDUCED SURFACE DEFECTS 有权
    具有降低的表面缺陷挤塑泡沫

    公开(公告)号:EP1263850A2

    公开(公告)日:2002-12-11

    申请号:EP01918250.0

    申请日:2001-02-27

    申请人: OWENS CORNING

    IPC分类号: C08J9/00

    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.