Polymerization catalyst systems and processes therefor and therewith
    37.
    发明授权
    Polymerization catalyst systems and processes therefor and therewith 有权
    聚合催化剂体系及其工艺及其

    公开(公告)号:US06525148B1

    公开(公告)日:2003-02-25

    申请号:US09640868

    申请日:2000-08-18

    IPC分类号: C08F452

    摘要: A copolymer of ethylene and a higher alpha olefin, preferably 1-hexene, can be produced using an activated chromium containing catalyst system and a cocatalyst selected from the group consisting of trialkylboron, trialkylsiloxyaluminum, and a combination of trialkylboron and trialkylaluminum compounds. The polymerization process must be carefully controlled to produce a copolymer resin having an exceptionally broad molecular weight distribution, extremely high PENT ESCR values, and a natural branch profile that impacts branching preferably into the high molecular weight portion of the polymer. The resulting copolymer resin is especially useful in high stiffness pipe applications.

    摘要翻译: 可以使用活化的含铬催化剂体系和选自三烷基硼,三烷基硅氧烷铝和三烷基硼和三烷基铝化合物的组合的助催化剂来制备乙烯和较高级α-烯烃(优选1-己烯)的共聚物。 聚合过程必须仔细控制,以产生具有非常宽的分子量分布,极高的PENT ESCR值和天然分支分布的共聚物树脂,其优选地影响聚合物的高分子量部分的分支。 所得共聚物树脂在高刚度管道应用中特别有用。