Catalyst system for ethylene polymerizations
    2.
    发明授权
    Catalyst system for ethylene polymerizations 失效
    用于乙烯聚合的催化剂体系

    公开(公告)号:US06794326B1

    公开(公告)日:2004-09-21

    申请号:US09673121

    申请日:2000-11-27

    IPC分类号: B01J3100

    摘要: A catalyst system for the polymerization of ethylene, comprising a particulate inorganic oxide supporting a chromium oxide being in a reduced oxidation state and a metallocene compound having the formula Cp2ZrR′R″, wherein each Cp, being equal or different, is an unsubstituted or substituted cyclopentadienyl compound, and R′ and R′, independent of each other, are selected from the group comprising alkyls having 1 to 6 carbon atoms, unsubstituted or substituted benzyl, and phenoxy substituted with alkyls having 1 to 6 carbon atoms; or R′ or R″ may be a halide. The catalyst system is prepared by a method comprising the steps of calcining the support, joining onto the surface of the support a chronium-organic compound, subjecting the obtained catalyst precursor to oxidizing conditions to obtain the chromium in an oxidized state, reducing the oxidized chromium to obtain a main part thereof in a bivalent oxidation state, and contacting the reduced catalyst with the metallocene compound.

    摘要翻译: 一种用于乙烯聚合的催化剂体系,其包含负载氧化还原氧化物的颗粒状无机氧化物和具有式Cp2ZrR'R“的茂金属化合物,其中每个Cp相同或不同,为未取代或未取代的 取代的环戊二烯基化合物,R'和R'彼此独立地选自含有1至6个碳原子的烷基,未取代或取代的苄基和被具有1至6个碳原子的烷基取代的苯氧基; 或R'或R“可以是卤素。 催化剂体系通过以下步骤制备:煅烧载体,在载体的表面上连接有机化合物,使得到的催化剂前体经历氧化条件以获得氧化态的铬,还原氧化铬 以二价氧化态获得其主要成分,并使还原催化剂与金属茂化合物接触。