Ethylene polymerization process
    7.
    发明申请
    Ethylene polymerization process 有权
    乙烯聚合工艺

    公开(公告)号:US20080132640A1

    公开(公告)日:2008-06-05

    申请号:US11606752

    申请日:2006-11-30

    IPC分类号: C08F297/08

    摘要: A process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a Ziegler-Natta catalyst system in two slurry reaction zones. Most of the polyethylene (70-95 wt. %) is produced in one of the zones, while a smaller fraction is produced in the other zone. The ratio of the weight average molecular weight of the smaller fraction to that of the larger fraction is greater than 8:1. The resulting polyethylene blend, which should have both high melt strength and high extrudate swell, will be useful for blow-molding applications.

    摘要翻译: 公开了一种聚合乙烯的方法。 聚合在齐格勒 - 纳塔催化剂体系存在下在两个浆料反应区中进行。 大部分聚乙烯(70-95重量%)是在其中一个区域中生产的,而另一个区域则产生较小的部分。 较小部分的重均分子量与较大部分的重均分子量之比大于8:1。 所得到的聚乙烯共混物,其应具有高熔体强度和高挤出物膨胀性,可用于吹塑应用。

    Preparation of polyethylene
    8.
    发明授权
    Preparation of polyethylene 失效
    聚乙烯的制备

    公开(公告)号:US06727331B2

    公开(公告)日:2004-04-27

    申请号:US10041002

    申请日:2001-12-28

    IPC分类号: C08F452

    摘要: A polyethylene having improved rheological properties is disclosed. The polyethylene has a melt index (MI2) from about 0.01 dg/min to about 50 dg/min and a melt strength (&eegr;) that satisfies MI2×&eegr;≧3.5. A process for making the polyethylene is also disclosed. The process uses an azaborolinyl-containing single-site catalyst in the presence of hydrogen, where the hydrogen consumption is controlled to be less than 30%.

    摘要翻译: 公开了具有改善的流变特性的聚乙烯。 聚乙烯具有约0.01dg / min至约50dg / min的熔体指数(MI2)和满足MI2xeta = 3.5的熔体强度(η)。 还公开了制备聚乙烯的方法。 该方法在氢气存在下使用含有氮杂硼烷的单中心催化剂,其中氢消耗被控制在小于30%。