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    Processes for producing high density polyethylene
    1.
    发明申请
    Processes for producing high density polyethylene 有权

    公开(公告)号：US20060223958A1

    公开(公告)日：2006-10-05

    申请号：US11386289

    申请日：2006-03-22

    申请人： D. Fischbuch

    发明人： D. Fischbuch

    IPC分类号： C08F2/00

    CPC分类号： C08F110/02 ,  Y02P20/584 ,  Y10S526/901 ,  Y10S526/905 ,  C08F4/69 ,  C08F2/34 ,  C08F2500/07

    摘要： Processes for reducing the ultra high molecular weight polymeric material content of a high density polyethylene produced with a bis-triarylsilyl chromate catalyst system are provided. Processes for reducing the gel content of articles produced from high density polyethylene are also provided. The gel content of the articles is reduced by using the high density polyethylene with reduced ultra high molecular weight polymeric material content to produce the articles. The processes described reduce the content of ultra high molecular weight polymeric material in comparison to conventional high density polyethylene by introducing at least one catalyst deactivator into a recycle gas line containing a recycle gas stream associated with the fluidized bed reactor. The at least one catalyst deactivator has a boiling point lower than the maximum temperature within the recycle gas line. In certain embodiments, the at least one catalyst deactivator is introduced in the portion of the recycle gas line upstream of a recycle gas cooler at a ratio of 0.0075 mole of the at least one catalyst deactivator per 1 million moles of make-up ethylene to about 0.12 mole of the at least one catalyst deactivator per 1 million moles of make-up ethylene in the reaction system. In certain embodiments, the at least one catalyst deactivator is oxygen.

    Low molecular weight induced condensing agents
    3.
    发明申请
    Low molecular weight induced condensing agents 有权
    低分子量诱导冷凝剂

    公开(公告)号：US20070265400A1

    公开(公告)日：2007-11-15

    申请号：US11433682

    申请日：2006-05-12

    申请人： D. Fischbuch ,  Robert Hagerty ,  Sandy Hinds ,  Douglas Holroyd ,  Ai Vey Ng ,  Diwaker Singh

    发明人： D. Fischbuch ,  Robert Hagerty ,  Sandy Hinds ,  Douglas Holroyd ,  Ai Vey Ng ,  Diwaker Singh

    IPC分类号： C08F2/00

    CPC分类号： B01J8/1809 ,  B01J2208/00274 ,  B01J2219/00191 ,  C08F10/00 ,  C08F110/02 ,  C08F2400/02 ,  Y10S526/901 ,  C08F2/34 ,  C08F2/00

    摘要： The present invention relates to a continuous gas phase process comprising passing a recycle stream through a fluidized bed in a gas phase fluidized bed reactor, wherein the recycle stream comprises a low molecular weight dew point increasing component and a high molecular weight component, polymerizing an alpha-olefin monomer in the presence of a catalyst, and controlling an amount of the low molecular weight dew point increasing component in the recycle stream such that a dew point approach temperature of the recycle stream is less than the dew point approach temperature when operating with the higher molecular weight dew point increasing component alone.

    摘要翻译： 连续气相方法本发明涉及一种连续气相方法，包括使循环流通过气相流化床反应器中的流化床，其中再循环流包含低分子量露点增加组分和高分子量组分，聚合α 烯烃单体，并且控制再循环流中低分子量露点增加组分的量，使得当循环流中的露点接近温度小于露点接近温度时 较高分子量露点增加组分。