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    METALLOCENE CATALYSTS AND THEIR USE IN POLYMERIZATION PROCESSES
    2.
    发明申请
    METALLOCENE CATALYSTS AND THEIR USE IN POLYMERIZATION PROCESSES 有权
    金属催化剂及其在聚合工艺中的应用

    公开(公告)号：US20100298511A1

    公开(公告)日：2010-11-25

    申请号：US12739308

    申请日：2008-10-09

    申请人： Chi-I Kuo ,  Dongming Li ,  Ching-Tai Lue ,  Francis C. Rix ,  Mark G. Goode ,  Daniel P. Zilker, JR. ,  Tae Hoon Kwalk

    发明人： Chi-I Kuo ,  Dongming Li ,  Ching-Tai Lue ,  Francis C. Rix ,  Mark G. Goode ,  Daniel P. Zilker, JR. ,  Tae Hoon Kwalk

    IPC分类号： C08F4/54

    CPC分类号： B01J31/2295 ,  B01J2531/48 ,  B01J2531/49 ,  C08F4/65912 ,  C08F4/65916 ,  C08F210/16 ,  C08F4/65925 ,  C08F4/65927

    摘要： A process for polymerizing olefin(s) utilizing a cyclic bridged metallocene catalyst system to produce polymers with improved properties is provided. The catalyst system may include a cyclic bridged metallocene, LA(R′SiR′)LBZrQ2, activated by an activator, the activator comprising aluminoxane, a modified aluminoxane, or a mixture thereof, and supported by a support, where: LA and LB are independently an unsubstituted or a substituted cyclopentadienyl ligand bonded to Zr and defined by the formula (C5H4-dRd), where R is hydrogen, a hydrocarbyl substituent, a substituted hydrocarbyl substituent, or a heteroatom substituent, and where d is 0, 1, 2, 3 or 4; LA and LB are connected to one another with a cyclic silicon bridge, R′SiR′, where R′ are independently hydrocarbyl or substituted hydrocarbyl substituents that are connected with each other to form a silacycle ring; and each Q is a labile hydrocarbyl or a substituted hydrocarbyl ligand.

    摘要翻译： 提供了利用环状桥连金属茂催化剂体系聚合烯烃以制备具有改进性能的聚合物的方法。 催化剂体系可以包括由活化剂活化的环状桥连金属茂LA（R'SiR'）LBZrQ2，活化剂包括铝氧烷，改性铝氧烷或其混合物，并由载体支持，其中：LA和LB是 独立地是未取代的或取代的环戊二烯基配体，其与Zr键合并由式（C5H4-dRd）定义，其中R是氢，烃基取代基，取代的烃基取代基或杂原子取代基，其中d是0,1,2 ，3或4; LA和LB通过环硅桥R'SiR'彼此连接，其中R'独立地是彼此连接形成硅环的烃基或取代的烃基取代基; 并且每个Q是不稳定的烃基或取代的烃基配体。

    METHOD FOR REDUCING AND/OR PREVENTING PRODUCTION OF EXCESSIVELY LOW DENSITY POLYMER PRODUCT DURING POLYMERIZATION TRANSITIONS
    7.
    发明申请
    METHOD FOR REDUCING AND/OR PREVENTING PRODUCTION OF EXCESSIVELY LOW DENSITY POLYMER PRODUCT DURING POLYMERIZATION TRANSITIONS 有权
    减少和/或防止在聚合过程中产生超低密度聚合物产品的方法

    公开(公告)号：US20100144981A1

    公开(公告)日：2010-06-10

    申请号：US12519484

    申请日：2007-12-12

    申请人： Bruce J. Savatsky ,  Daniel P. Zilker, JR.

    发明人： Bruce J. Savatsky ,  Daniel P. Zilker, JR.

    IPC分类号： C08F2/00

    CPC分类号： C08F10/00 ,  C08F210/16 ,  C08F2400/02 ,  Y10S526/901 ,  Y10S526/905 ,  C08F2/34 ,  C08F2/00 ,  C08F210/14 ,  C08F2500/12 ,  C08F2500/08

    摘要： A method for controlling a transition from an initial polymerization reaction to a target polymerization reaction in a manner that reduces significantly the amount of off-grade product having excessively low density produced during the transition, including steps of: during the transition, maintaining a first one of a concentration ratio and a feed ratio at an at least substantially constant value while implementing process changes in an effort to bring produced polymer into compliance with a target specification set and monitoring (without controlling) the other one of the concentration ratio and the feed ratio to generate first data; and during the transition, determining from the first data whether polymer having excessively low density is likely to be produced during the transition, and upon determining that polymer having excessively low density is likely to be produced during the transition, maintaining during the remaining portion of the transition the other ratio at a value that is at least substantially constant while allowing the first ratio to vary is provided.

    摘要翻译： 用于控制从初始聚合反应转变为目标聚合反应的方法，其显着降低在转变期间产生的具有过低密度的低级产物的量，包括以下步骤：在转变期间，保持第一个 浓度比和进料比在至少基本恒定的值的同时，同时实施过程变化，努力使生成的聚合物符合目标规范集和监测（不控制）另一个浓度比和进料比 生成第一个数据; 并且在转变期间，从第一数据确定是否可能在转变期间产生具有过低密度的聚合物，并且在确定在转变期间可能产生密度过低的聚合物时，保持在剩余部分 提供了在允许第一比率变化的同时至少基本上恒定的值的另一比例的转变。