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    Highly flowable propylene block copolymers
    2.
    发明申请
    Highly flowable propylene block copolymers 有权
    高流动性丙烯嵌段共聚物

    公开(公告)号：US20050038208A1

    公开(公告)日：2005-02-17

    申请号：US10296256

    申请日：2001-05-23

    申请人： Ulrich Dahn ,  Wolfgang Bidell ,  Hans-Jurgen Zimmermann ,  Roland Hingmann ,  Joachim Rosch ,  Gunther Schweier ,  Jurgen Oelze

    发明人： Ulrich Dahn ,  Wolfgang Bidell ,  Hans-Jurgen Zimmermann ,  Roland Hingmann ,  Joachim Rosch ,  Gunther Schweier ,  Jurgen Oelze

    IPC分类号： C08J5/00 ,  C08F2/00 ,  C08F4/642 ,  C08F10/06 ,  C08F110/06 ,  C08F210/06 ,  C08F297/08 ,  C08L53/00 ,  D01F6/30

    CPC分类号： C08F297/08 ,  C08F10/06 ,  C08F110/06 ,  C08F210/06 ,  C08L53/00 ,  C08F2/001 ,  C08F2/34 ,  C08L2666/02 ,  C08F2500/12 ,  C08F2500/17 ,  C08F210/16

    摘要： The invention relates to highly flowable propylene block copolymers that comprise 50 to 80 wt.-% of a propylene homopolymer and 10 to 70 wt.-% of a propylene copolymer having 5 to 50 wt.-% of a C2-C8 alk-1-ene polymerized into it that is different from propylene, and that are obtainable from the gaseous phase by a two-step polymerization by means of a Ziegler-Natta catalyst system. In a first polymerization step, the propylene is polymerized at a pressure of 10 to 50 bar, a temperature of 50 to 100° C. and an average dwelling time of the reaction mixture of 0.3 to 5 hours in the presence of at least 2.0% by volume, based on the total volume, of hydrogen. The propylene homopolymer obtained in said first polymerization step is transferred together with the Ziegler-Natta catalyst system into an intermediate container, expanded for 0.01 to 5 minutes to less than 5 bar and maintained at a temperature of 10 to 80° C. The pressure in the intermediate container is then increased by 5 to 60 bar by introducing under pressure a gaseous mixture, and the propylene homopolymer is then transferred to a second polymerization step together with the Ziegler-Natta catalyst system. In said second polymerization step, a mixture from propylene and a C2-C8 alkylene is polymerized into the propylene homopolymer at a pressure of 10 to 50 bar, a temperature of 50 to 100° C. and an average dwelling time of 0.5 to 5 hours. The weight ratio between the monomers reacted in the first and those reacted in the second polymerization step are adjusted to be in the range of from 4:1 to 1:1.

    摘要翻译： 本发明涉及高流动性丙烯嵌段共聚物，其包含50至80重量％的丙烯均聚物和10至70重量％的丙烯共聚物，其具有5至50重量％的C 2 -C 8烷基-1 其与丙烯不同，并且可通过采用齐格勒 - 纳塔催化剂体系的两步聚合由气相获得。 在第一聚合步骤中，丙烯在10至50巴的压力，50至100℃的温度和在至少2.0％的存在下反应混合物的平均停留时间为0.3至5小时的聚合反应， ，基于总体积的氢气。 将所述第一聚合步骤中获得的丙烯均聚物与齐格勒 - 纳塔催化剂体系一起转移到中间容器中，膨胀0.01至5分钟至小于5巴，并保持在10至80℃的温度。 然后通过在压力下引入气体混合物将中间容器增加5至60巴，然后将丙烯均聚物与齐格勒 - 纳塔催化剂体系一起转移到第二聚合步骤。 在所述第二聚合步骤中，将丙烯和C 2 -C 8亚烷基的混合物在10至50巴的压力，50至100℃的温度和0.5至5小时的平均停留时间内聚合成丙烯均聚物 。 在第一聚合步骤中反应的单体和在第二聚合步骤中反应的单体之间的重量比被调节至4:1至1:1的范围内。