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    • 7. 发明授权
    • Mixed chromium catalysts and polymerizations utilizing same
    • 混合铬催化剂和利用其的聚合
    • US5198400A
    • 1993-03-30
    • US675378
    • 1991-03-26
    • Stanley J. KatzenThomas J. PullukatMichael W. LynchLouis J. Rekers
    • Stanley J. KatzenThomas J. PullukatMichael W. LynchLouis J. Rekers
    • C08F4/06C08F4/24C08F4/648C08F10/00C08F110/02
    • C08F10/00C08F110/02C08F2410/04
    • Mixed catalyst compositions comprised of a first supported chromium-containing catalyst component and a second supported chromium-containing catalyst component and which additionally have one or more metallic or non-metallic catalytic agents associated therewith are provided. The additional metallic or non-metallic elements associated with the catalyst components can be aluminum, titanium, zirconium, boron, phosphorous or combinations thereof. The pore volume of the silica supports used for the first and second catalyst components differs by at least 0.3 cc/g. The mixed catalyst compositions of the invention are useful for the preparation of polyolefins. They are particularly useful of polymerization of ethylene in particle form polymerizations to produce high density polyethylene blow molding resins having good processability and physical properties. The improved particle form polymerization process and products obtained thereby using the above-described mixed catalyst compositions are also described.
    • 提供由第一负载的含铬催化剂组分和第二负载的含铬催化剂组分组成的并且另外具有与其相关的一种或多种金属或非金属催化剂的混合催化剂组合物。 与催化剂组分相关的另外的金属或非金属元素可以是铝,钛,锆,硼,磷或它们的组合。 用于第一和第二催化剂组分的二氧化硅载体的孔体积至少为0.3cc / g。 本发明的混合催化剂组合物可用于制备聚烯烃。 它们特别可用于以颗粒形式聚合的乙烯聚合,以生产具有良好加工性能和物理性能的高密度聚乙烯吹塑树脂。 还描述了改进的颗粒形式聚合方法和由此使用上述混合催化剂组合物获得的产物。