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    • 9. 发明授权
    • Process for the preparation of polyethylene
    • 制备聚乙烯的方法
    • US06617405B1
    • 2003-09-09
    • US09353207
    • 1999-07-14
    • Robert James Jorgensen
    • Robert James Jorgensen
    • C08F444
    • C08F10/02C08F210/16Y02P20/52C08F4/6425C08F4/6543C08F2/34C08F210/14C08F2500/12C08F2500/18C08F2500/24C08F210/08
    • A process of polymerizing ethylene or ethylene and one or more comonomers in one or more fluidized bed reactors with a catalyst system comprising (i) a supported or unsupported magnesium/titanium based precursor in slurry form, said precursor containing an electron donor; and (ii) an activator containing aluminum in an amount sufficient to essentially complete the activation of the precursor is disclosed. In the process, the precursor and the activator are mixed prior to introduction into the reactor in at least one mixing procedure, and then the mixture is contacted again with additional activator to essentially complete activation of the precursor. In the method, the atomic ratio of aluminum to titanium is in the range of about 1:1 to about 15:1 and the mole ratio of activator to electron donor is about 1:1 to about 2:1, and no additional activator is introduced into the reactor(s).
    • 一种在一个或多个流化床反应器中用催化剂体系聚合乙烯或乙烯和一种或多种共聚单体的方法,所述催化剂体系包括(i)以浆料形式的负载或未负载的镁/钛基前体,所述前体含有电子给体; 并且(ii)含有足以基本上完​​成前体活化的量的含铝的活化剂被公开。 在该方法中,在将至少一种混合程序引入反应器之前将前体和活化剂混合,然后将混合物再与另外的活化剂接触以基本上完​​全活化前体。 在该方法中,铝与钛的原子比在约1:1至约15:1的范围内,活化剂与电子给体的摩尔比为约1:1至约2:1,并且不另外的活化剂为 引入反应器中。
    • 10. 发明授权
    • Staged reactor process
    • 分阶段反应器工艺
    • US06187866B1
    • 2001-02-13
    • US09326083
    • 1999-06-04
    • Robert James JorgensenStephanie Marie UphamJames Daniel MaddenWilliam James Michie, Jr.
    • Robert James JorgensenStephanie Marie UphamJames Daniel MaddenWilliam James Michie, Jr.
    • C08F800
    • C08F210/16C08F2/001
    • In a process for the in situ blending of polymers comprising contacting ethylene and one or more comonomers in two or more fluidized bed reactors with a catalyst system comprising (i) a magnesium/titanium based precursor containing an electron donor and (ii) a hydrocarbyl aluminum cocatalyst, the improvement comprising (A) increasing or decreasing the melt flow ratio and/or molecular weight of the blend by, respectively, decreasing or increasing the mole ratio of a precursor activator compound to the electron donor or (B) increasing or decreasing the bulk density of the blend by, respectively, increasing or decreasing the mole ratio of a precursor activator compound to the electron donor, both (A) and (B) subject to defined provisos including partial pre-activation of the precursor.
    • 在一种用于原位共混聚合物的方法中,包括使两个或多个流化床反应器中的乙烯和一种或多种共聚单体与催化剂体系接触,所述催化剂体系包含(i)含有电子给体的基于镁/钛的前体和(ii)烃基铝 助催化剂,其改进包括(A)通过分别降低或增加前体活化剂化合物与电子给体的摩尔比来增加或降低共混物的熔体流动比和/或分子量,或(B)增加或减少 通过分别增加或降低前体活化剂化合物与电子给体的摩尔比(A)和(B),共混物的体积密度均受制于包括部分预活化前体的限定条件。