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    • 8. 发明公开
    • Polyethylene composition
    • Polyäthylen-Zusammensetzung。
    • EP0273284A2
    • 1988-07-06
    • EP87118488.3
    • 1987-12-14
    • Nippon Oil Co., Ltd.
    • Tajima, YoshioNomiyama, KazutoshiShimo, YoshiyukiKuroda, NobuyukiMatsuura, Kazuo
    • C08F10/02C08L23/04
    • C08F10/02C08L23/06C08L2205/02C08L2205/025C08L2308/00C08L2314/02C08F2/001C08L2666/06
    • Disclosed is polyethylene composition having excellent environmental stress cracking resistance (ESCR) and giving molded articles with good surface properties.
      This composition comprises a blend of two specific types of polyethylene selected with due consideration for their molecular weight distribution in addition to their molecular weights, so that it has excellent melt tension, ESCR and moldability. Accordingly, it can suitably be used in blow molding and extrusion molding to produce molded articles with no shark skin, as well as vessels of very large size.
      This composition is formed by blending (A) polyethylene obtained according to a two-step polymer­ization process using a Ziegler catalyst containing magnesium and titanium, and (B) high-molecular-weight polyethylene obtained with the aid of a chromium-­containing catalyst, in a specified proportion.
    • 公开了具有优异的耐环境应力开裂性(ESCR)的聚乙烯组合物和具有良好表面性能的模塑制品。 除了它们的分子量之外,该组合物还包括两种特定类型的聚乙烯的共混物,其中考虑到它们的分子量分布,从而具有优异的熔体张力,ESCR和成型性。 因此,它可以适用于吹塑和挤出成型,以生产没有鲨鱼皮的模制品,以及非常大尺寸的容器。 该组合物通过使用含有镁和钛的齐格勒催化剂和(B)借助于含铬催化剂获得的高分子量聚乙烯,通过使用两步聚合方法得到的聚乙烯(A) 一个比例。