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    A pressureless polymer pipe, a composition therefore, and a process for preparing it
    17.
    发明公开
    A pressureless polymer pipe, a composition therefore, and a process for preparing it 有权
    Druckloses Polymerrohr，Zusammensetzung und Verfahren zu seiner Herstellung

    公开(公告)号：EP1632529A1

    公开(公告)日：2006-03-08

    申请号：EP04445088.0

    申请日：2004-09-02

    申请人： Borealis Technology Oy

    发明人： Ek, Carl-Gustaf ,  Malm, Bo ,  Tuominen, Olli

    IPC分类号： C08L23/12 ,  C08F110/06 ,  C08F10/00

    CPC分类号： F16L9/147 ,  C08F210/06 ,  C08F210/16 ,  C08L23/12 ,  C08L23/14 ,  Y10T428/139 ,  C08F2/001 ,  C08L2666/06 ,  C08F2500/17 ,  C08F2500/12 ,  C08F2500/13

    摘要： A pressureless polymer pipe, a composition therefore, and a process of preparing the composition are described. The pipe is characterised in that the polymer comprises a propylene polymer composition where the propylene base polymer
    is a heterophasic propylene copolymer having a matrix of a propylene homopolymer and a dispersed phase of an elastomeric copolymer of propylene and at least one olefin comonomer;
    has a comonomer content of 2-7 % by weight, based on the weight of the heterophasic propylene copolymer;
    has a melt flow rate MFR (2/230), determined according to ISO 1133 C4, of 0.1-2.0 g/10 min;
    has a broad molecular weight distribution as defined by its rheology shear thinning index, SHI 0/50 , measured at 200°C of 9-30;
    has a tensile modulus, determined according to ISO 527-2/1B at 1 mm/min and 23°C of at least 1800 MPa;
    has an impact strength, determined according to ISO 179/1eA of at least 6 kJ/m 2 at 0°C and at least 2 kJ/m 2 at -20°C.
    The composition is a polymer composition as defined above.
    The process is characterised by polymerizing in the presence of a stereospecific Ziegler-Natta catalyst including an electron donor:

    (i) a propylene homopolymer matrix in at least one loop reactor at a temperature of at least 80°C and a pressure of 4600-10000 kPa; and
    (ii) an elastomeric copolymer of propylene and at least one olefin comonomer in at least one gas-phase reactor at a lower temperature than in stage (i);
       
    to obtain a base polymer of heterophasic propylene copolymer as defined above.

    摘要翻译： 描述了无压聚合物管，组合物，以及制备该组合物的方法。 管的特征在于聚合物包括丙烯聚合物组合物，其中丙烯基聚合物是具有丙烯均聚物基质和丙烯与至少一种烯烃共聚单体的弹性体共聚物的分散相的多相丙烯共聚物; 基于多相丙烯共聚物的重量，共聚单体含量为2-7重量％; 具有根据ISO 1133 C4测定的熔体流动速率MFR（2/230）为0.1-2.0g / 10min; 具有由流变剪切稀化指数SHI 0/50定义的宽分子量分布，在200℃下测量为9-30; 具有根据ISO 527-2 / 1B以1mm / min和23℃测定至少1800MPa的拉伸模量; 具有根据ISO 179 / 1eA在0℃下测定为至少6kJ / m 2和-20℃下至少2kJ / m 2的冲击强度。 组合物是如上所定义的聚合物组合物。 该方法的特征在于在包含电子给体的立体特异性齐格勒 - 纳塔催化剂存在下聚合：（i）在至少一个环管反应器中在至少80℃的温度和4600-10000的压力下的丙烯均聚物基质 千帕; 和（ii）丙烯与至少一种烯烃共聚单体在比在阶段（i）中的温度低的至少一个气相反应器中的弹性体共聚物; 以获得如上所述的多相丙烯共聚物的基础聚合物。