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    Polypropylene block copolymers composition
    2.
    发明公开
    Polypropylene block copolymers composition 失效
    Zusammensetzung von Propylen-Block-Copolymeren

    公开(公告)号：EP0776939A1

    公开(公告)日：1997-06-04

    申请号：EP96119231.7

    申请日：1996-11-29

    申请人： UBE INDUSTRIES, LTD. ,  TOYOTA JIDOSHA KABUSHIKI KAISHA

    发明人： Akagawa, Tomohiko, Sakai Factory, Ube Ind., Ltd. ,  Sakai, Ikunori, Sakai Factory, Ube Ind., Ltd. ,  Hinenoya, Saburo, Sakai Factory, Ube Ind., Ltd. ,  Inoue, Kaoru ,  Nomura, Takao ,  Nishio, Takeyoshi

    IPC分类号： C08L53/00

    CPC分类号： C08L53/00 ,  C08L2666/04

    摘要： A polypropylene resin composition comprising the following components (A), (B), (C) and (D): (A) a crystalline ethylene-propylene block copolymer containing a room-temperature-p-xylene-soluble fraction Ac having an ethylene content of 12-26% by weight and an intrinsic viscosity (measured at 135°C in decalin) of 6 dl/g or more, (B) a crystalline ethylene-propylene block copolymer containing a room-temperature-p-xylene-soluble fraction Bc having an ethylene content of 27-50% by weight and an intrinsic viscosity (measured at 135°C in decalin) of 4 dl/g or less, (C) an ethylene-α-olefin copolymer obtained by polymerization using a single-site catalyst, having a molecular weight distribution (Mw/Mn) of 2.5 or less, a melt flow ratio (MI 10 /MI 2.16 ) of 6-15 (wherein MI 10 is a melt index measured at 190°C under a load of 10kg and MI 2.16 is a melt index measured at 190°C under a load of 2.16kg) and an α-olefin proportion of 70 mole % or less, and (D) a talc having an average particle diameter of 3-7 µm as measured by laser diffraction. In the composition the weight ratios As and Bs of the room-temperature-p-xylene-soluble fractions Ac and Bc to the total weight of the components (A) and (B) satisfy the following formulas (1) and (2): (1) As + Bs = 7-15% by weight (2) As/(As + Bs) = 0.1-0.6 The polypropylene component contained in each of the components (A) and (B) has an isotactic pentad fraction (mmmm) of 96% or more, and the mixture of the components (A) and (B) has a melt flow rate (measured at 230°C under a load of 2,160 g) of 30-70 g/10-min, the total content of the components (A) and (B) is 50-80% by weight, the content of the component (C) is 5-20% by weight, and the content of the component (D) is 15-30% by weight, and the composition comprising the components (A), (B), (C) and (D) has a melt flow rate (measured at 230°C under a load of 2,160 g) of 25 g/10-min or more. The composition is superior in stiffness, resistance to heat deformation, impact resistance and moldability and can provide a molded article of good appearance.

    摘要翻译： 包含以下组分（A），（B），（C）和（D））的聚丙烯树脂组合物：（A）含有具有乙烯的室温对二甲苯可溶性部分Ac的结晶乙烯 - 丙烯嵌段共聚物 含量为12-26重量％，特性粘度（在135℃，萘烷中测定）为6dl / g以上，（B）含有室温对二甲苯可溶的结晶乙烯 - 丙烯嵌段共聚物 乙烯含量为27〜50重量％，特性粘度（在135℃萘烷瓶中测定）为4dl / g以下的馏分Bc为（C）乙烯-α-烯烃共聚物 具有2.5或更小的分子量分布（Mw / Mn），6-15的熔体流动比（MI10 / MI2.16），其中MI10是在190℃的负荷下测量的熔体指数 10kg，MI2.16是在190℃，2.16kg负荷下测定的熔融指数，70摩尔％以下的α-烯烃比例，（D）具有 通过激光衍射测得的3〜7μm的粒径。 在组成中，室温对二甲苯可溶成分Ac和Bc与成分（A）和（B）的总重量的重量比As和Bs满足下式（1）和（2）： 组分（A）和组分（B）中所含的聚丙烯组分具有96％以上的全同立构五单元组分数（mmmm），组分（A）和（ B）具有30-70g / 10分钟的熔体流动速率（在230℃，2,160g负荷下测量），组分（A）和（B）的总含量为50-80重量％ ，组分（C）的含量为5-20重量％，组分（D）的含量为15-30重量％，组分（A），（B），（C ）和（D）的熔体流动速率（在230℃，2,160克的负荷下测定）为25g / 10分钟以上。 组合物的刚性，耐热变形性，耐冲击性和成型性优异，并且可以提供良好的外观的模制品。