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    • 8. 发明申请
    • SUPPORTED METALLOCENE CATALYSTS AND THEIR USE IN PRODUCING STEREOSPECIFIC POLYMERS
    • 支撑金属茂催化剂及其在制备立体异构聚合物中的用途
    • WO2006047396A2
    • 2006-05-04
    • PCT/US2005/038143
    • 2005-10-21
    • FINA TECHNOLOGY, INC.LOPEZ, MargaritoSHAMSHOUM, Edwar, S.CAMPBELL, Donald, G., Jr.
    • LOPEZ, MargaritoSHAMSHOUM, Edwar, S.CAMPBELL, Donald, G., Jr.
    • C08F4/44B01J31/00
    • B01J31/2295B01J2231/12B01J2531/46B01J2531/48B01J2531/49B01J2531/56Y10S526/943
    • Supported stereospecific catalysts and processes for the stereotactic propagation of a polymer chain derived from ethylenically unsaturated monomers which contain three or more carbon atoms or which are substituted vinyl compounds, specifically alpha olefins, particularly the polymerization of propylene to produce syndiotactic or isotactic polypropylene. The supported metallocene catalyst comprises a stereospecific metallocene catalyst incorporating a metallocene ligand structure having two sterically dissimilar cyclopentadienyl ring structures coordinated with the central transition metal atom, and a co-catalyst component comprising at least one of an alkyl alumoxane and an alkylaluminum compound At least one of the cyclopentadienyl ring structures is a substituted cyclopentadienyl group which provides an orientation with respect to said transition metal atom which is sterically different from the orientation of the other cyclopentadienyl group, and both of the cyclopentadienyl groups are in a stereorigid relationship with one another by virtue of bridge or substituent groups, which prevent rotation of said ring structures. Both the metallocene catalyst and the co-catalyst are supported on a particulate silica support comprising silica particles having an average particle size of 5-40 microns and an average effective pore size of 50-200 angstroms. The silica support further has a differential pore size distribution of a pore volume of at least 0.01 cm 2 /g. within a range having a maximum pore width of no more than 300 angstroms. The metallocene has a retention factor on this support of at least 90 wt. % after aging in tri-isobutylaluminum at a temperature of 25 °C for a period of 12 hours.
    • 用于衍生自含有三个或更多个碳原子的烯属不饱和单体或者是取代的乙烯基化合物特别是α-烯烃的聚合物链的立体定向催化剂和方法,特别是丙烯与 生产间同立构或全同立构聚丙烯。 所述负载型茂金属催化剂包含具有茂金属配体结构的立体有择金属茂催化剂,所述茂金属配体结构具有与所述中心过渡金属原子配位的两个空间上不相似的环戊二烯基环结构和包含烷基铝氧烷和烷基铝化合物中的至少一种的助催化剂组分。 的环戊二烯基环结构是一个取代的环戊二烯基,它提供相对于与另一个环戊二烯基的取向在空间上不同的所述过渡金属原子的取向,且两个环戊二烯基彼此之间由于立体关系 的桥或取代基,其阻止所述环结构的旋转。 茂金属催化剂和助催化剂均负载在包含平均粒径为5-40微米且平均有效孔径为50-200埃的二氧化硅颗粒的颗粒状二氧化硅载体上。 二氧化硅载体还具有孔体积至少为0.01cm 2 / g的微分孔径分布。 在最大孔宽不超过300埃的范围内。 茂金属在该载体上的保留因子为至少90wt。 在25℃的温度下在三异丁基铝中老化12小时后的%