Method and catalyst system for producing polyolefins with broadened molecular weight distributions
    1.
    发明授权
    Method and catalyst system for producing polyolefins with broadened molecular weight distributions 失效
    用于生产具有更宽分子量分布的聚烯烃的方法和催化剂体系

    公开(公告)号:US06384161B1

    公开(公告)日:2002-05-07

    申请号:US09474864

    申请日:1999-12-30

    IPC分类号: C08F402

    摘要: The present invention provides a process for preparing a supported metallocene catalyst system that can be used to catalyze formation of polyolefins having a wide molecular weight range. In accordance with the process of the present invention, a first portion of an inorganic oxide is dried under a first set of conditions, wherein upon treatment with an organoaluminoxide and a metallocene, a first catalyst system is formed usable to produce a polyolefin product having a first molecular weight average distribution. A second portion of an inorganic oxide under a second set of conditions, wherein upon treatment with an organoaluminoxane and a metallocene, a second catalyst system is formed usable to produce polyolefin product having a second molecular weight distribution. An amount of the first portion is mixed with an amount of the second portion to produce a final inorganic oxide support. The final inorganic oxide support is combined with an organoaluminoxane and a metallocene to produce a supported metallocene catalyst system usable to catalyze formation of polyolefins with a broadened molecular weight average distribution. In another aspect, the present invention provides a process for polymerizing polyolefins using the inventive supported metallocene catalyst system. The process comprises preparing the final catalyst as mentioned above and then contacting an olefin with the final metallocene catalyst system under conditions supporting polymerization.

    摘要翻译: 本发明提供了一种制备负载型茂金属催化剂体系的方法,该体系可用于催化具有宽分子量范围的聚烯烃的形成。 根据本发明的方法,在第一组条件下将无机氧化物的第一部分干燥,其中在用有机铝氧化物和茂金属处理时,形成可用于生产聚烯烃产品的第一催化剂体系,所述聚烯烃产物具有 第一分子量平均分布。 在第二组条件下的无机氧化物的第二部分,其中在用有机铝氧烷和茂金属处理时,形成可用于制备具有第二分子量分布的聚烯烃产物的第二催化剂体系。 将第一部分的量与第二部分的量混合以产生最终的无机氧化物载体。 最终的无机氧化物载体与有机铝氧烷和茂金属组合以产生可用于催化分子量平均分布扩大的聚烯烃形成的负载金属茂催化剂体系。另一方面,本发明提供使用本发明聚合聚烯烃的方法 负载金属茂催化剂体系。 该方法包括如上所述制备最终催化剂,然后在支持聚合的条件下使烯烃与最终茂金属催化剂体系接触。

    Supported metallocene catalyst system and method for polymerizing olefins
    6.
    发明授权
    Supported metallocene catalyst system and method for polymerizing olefins 失效
    负载金属茂催化剂体系及烯烃聚合方法

    公开(公告)号:US06239060B1

    公开(公告)日:2001-05-29

    申请号:US09224176

    申请日:1998-12-31

    IPC分类号: B01J3502

    摘要: The present invention provides a new type of supported metallocene catalyst system. In one aspect of the invention, an inorganic oxide support, such as silica, is impregnated with a Group XIII element such as B, Al or GA. The support is then contacted with a liquid catalyst system prepared by combining in a liquid an organo aluminoxane and a metallocene having two cyclopetadienyl-type ligands selected from substituted or unsubstituted cyclopentadienyl, indenyl, benzoindenyl, tetrahdroindenyl, benzofluorenyl, octahydrofluorenyl, and fluorenyl ligands to form a supported metallocene catalyst system. In preferred embodiments the process further includes conducting prepolymerization of at least one olefin in the presence of the supported metallocene catalyst system to produce a prepolymerized metallocene catalyst system. The prepolymerized metallocene catalyst system prepared in this manner yields substantially increased activity for the polymerization of olefins. In another aspect, the present invention also provides a method for polymerization of olefins using the inventive supported metallocene catalyst system.

    摘要翻译: 本发明提供一种新型的负载型茂金属催化剂体系。 在本发明的一个方面,无机氧化物载体如二氧化硅用第ⅩⅢ族元素如B,Al或GA浸渍。 然后将载体与通过在液体中组合有机铝氧烷和具有选自取代或未取代的环戊二烯基,茚基,苯并茚基,四氢茚基,苯并芴基,八氢芴基和芴基配体的两个环戊二烯基型配体的金属茂接触而形成的液体催化剂体系形成 负载金属茂催化剂体系。 在优选的实施方案中,该方法还包括在负载的茂金属催化剂体系的存在下进行至少一种烯烃的预聚合,以产生预聚合的茂金属催化剂体系。 以这种方式制备的预聚合的茂金属催化剂体系产生了烯烃聚合的显着提高的活性。 另一方面,本发明还提供使用本发明的负载型茂金属催化剂体系聚合烯烃的方法。