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    • 5. 发明公开
    • MULTIMODAL POLYETHYLENE CONTAINER
    • 多模聚乙烯容器
    • EP3293213A1
    • 2018-03-14
    • EP16188343.4
    • 2016-09-12
    • Thai Polyethylene Co., Ltd.SCG Chemicals Co., Ltd.
    • Chatdao, Suk-emNatthaporn, Suchao-InWatcharee, CheevasrirungruangWarachad, KlomkamolBoonyakeat, Thitisak
    • C08F2/00B01J19/00B65D83/14B65D83/16C08F2/01C08F2/12C08F2/18C08L23/04C08L23/06
    • C08F2/00C08F2/01C08F2/12C08F2/18C08L23/06C08L2203/10C08L2205/025C08L2205/03C08L2207/068C08L23/0815
    • The present invention relates to a process for producing a multimodal polyethylene composition in the reactor system according to any of the claims 1 to 3, comprising;
      (a) polymerizing ethylene in an inert hydrocarbon medium in the first reactor in the presence of a catalyst system, selected from Ziegler-Natta catalyst or metallocene, and hydrogen in an amount of 0.1-95% by mol with respect to the total gas present in the vapor phase in the first reactor to obtain a low molecular weight polyethylene or medium molecular weight polyethylene;
      (b) removing in the hydrogen removal unit 98.0 to 99.8% by weight of the hydrogen comprised in a slurry mixture obtained from the first reactor at a pressure in the range of 103-145 kPa (abs) and transferring the obtained residual mixture to the second reactor;
      (c) polymerizing ethylene and optionally C 4-12 a-olefin comonomer in the second reactor in the presence of a catalyst system, selected from Ziegler-Natta catalyst or metallocene, and in the presence of hydrogen in an amount obtained in step (b) to obtain a first high molecular weight polyethylene or a first ultra high molecular weight polyethylene in the form of a homopolymer or a copolymer and transferring a resultant mixture to the third reactor; and
      (d) polymerizing ethylene, and optionally C 4-12 α-olefin comonomer in the third reactor in the presence of a catalyst system, selected from Ziegler-Natta catalyst or metallocene, and hydrogen, wherein the amount of hydrogen in the third reactor is in a range of 0.1-70% by mol, preferably 0.1-60% by mol with respect to the total gas present in the vapor phase in the third reactor or optionally substantial absence of hydrogen to obtain a second high molecular weight polyethylene or a second ultra high molecular weight polyethylene homopolymer or copolymer.
      The polyethylene composition obtained is suitable for hollow container applications. The composition provides the good balance between mechanical properties and processability. The balance between Charpy impact resistance and flexural modulus is good, as well as provides the high swelling ratio for better processability that other prior art of multimodal.
    • 本发明涉及在根据权利要求1至3中任一项所述的反应器系统中生产多峰聚乙烯组合物的方法,其包括: (a)在选自齐格勒 - 纳塔催化剂或茂金属的催化剂体系存在下,在第一反应器中在惰性烃介质中聚合乙烯,氢气的量相对于存在的总气体为0.1-95%摩尔 在第一反应器中以气相形式获得低分子量聚乙烯或中等分子量聚乙烯; (b)在103-145kPa(绝对压力)的范围内,在除氢单元中除去98.0-99.8重量%的由第一反应器获得的浆料混合物中所含的氢,并将所得残余混合物转移到 第二反应器; (c)在选自齐格勒 - 纳塔催化剂或茂金属的催化剂体系存在下,并且在步骤(b)中获得的量的氢存在下,在第二反应器中使乙烯和任选的C 4-12α-烯烃共聚单体聚合, 得到均聚物或共聚物形式的第一高分子量聚乙烯或第一超高分子量聚乙烯,并将所得混合物转移到第三反应器中; 和(d)在选自齐格勒 - 纳塔催化剂或茂金属的催化剂体系和氢存在下,在第三反应器中使乙烯和任选的C 4-12α-烯烃共聚单体聚合,其中第三反应器中的氢的量为 在相对于第三反应器中气相中存在的总气体的0.1-70摩尔%,优选0.1-60摩尔%的范围内或任选地基本不存在氢以获得第二高分子量聚乙烯或第二 超高分子量聚乙烯均聚物或共聚物。 所获得的聚乙烯组合物适用于中空容器应用。 该组合物在机械性能和可加工性之间提供了良好的平衡。 夏比冲击强度与挠曲模量之间的平衡良好,并且提供了与其他现有技术的多模式相比更好的加工性的高膨胀比。