Catalysts compositions for the polymerization and copolymerization of alpha-olefins
申请人:Royo Sancho Jose
公开号:US20060142147A1
公开(公告)日:2006-06-29
A catalyst system, a polymerization process using that catalyst system and polymers produced therefrom. The catalytic system results from the combination of bridged indenyl metallocenes of general formula I and an organoaluminium or boron perfluorinated co-catalyst, where M is a transition metal of Group 4 of the Periodic Table of the elements, Q is a divalent substituent and X1 and X2 are monovalent anionic ligands. Polyethylene copolymers made with such catalysts can have from narrow to broad to bimodal molecular weight distribution and melt indexes from about 0 to higher than 10 without the need of molecular weight regulators, depending on proper selection of the indenyl substituent, number of substituents (single or both indenes substituted) and the type of stereoisomeric form used: pure (racemic or meso) or mixtures thereof.
一种催化剂体系、一种使用该催化剂体系的聚合工艺以及由此生产的聚合物。该催化剂体系由通式 I 的桥联茚基茂金属和有机铝或硼全氟助催化剂组合而成,其中 M 为元素周期表第 4 族过渡金属,Q 为二价取代基,X1 和 X2 为一价阴离子配位体。使用这种催化剂制成的聚乙烯共聚物可以具有从窄到宽再到双峰的分子量分布,熔融指数从约 0 到高于 10,而无需分子量调节剂,这取决于对茚基取代基、取代基数目(单个或两个茚基取代基)的适当选择,以及所使用的立体异构体类型:纯立体异构体(外消旋体或中消旋体)或其混合物。